Signal transmission method, device, network side equipment and terminal equipment

Abstract

The present application discloses a signal transmission method, apparatus, network-side equipment, and terminal equipment, and belongs to the field of communication technology. The signal transmission method of an embodiment of the present application includes: a transmitting end performs super-Nyquist FTN processing on at least two modulation symbol sets respectively; the transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal; the transmitting end transmits the multi-carrier FTN signal; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a signal transmission method, apparatus, network-side equipment, and terminal equipment. Background Art

[0002] Traditional non-orthogonal multiple access (NOMA) technology only explores user differentiation in the code domain and is essentially a degraded form of orthogonal code division multiple access (CDMA). Traditional NOMA technology can only transmit one modulation symbol set per carrier, resulting in poor resource utilization. Summary of the Invention

[0003] The embodiments of the present application provide a signal transmission method, apparatus, network-side equipment, and terminal equipment, which can solve the problem of poor resource utilization in traditional NOMA technology.

[0004] In a first aspect, a signal transmission method is provided, the method comprising:

[0005] The transmitting end performs Faster-than-Nyquist (FTN) processing on at least two modulation symbol sets respectively;

[0006] The transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal;

[0007] The transmitting end sends the multi-carrier FTN signal;

[0008] The modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers.

[0009] In a second aspect, a signal transmission device is provided, comprising:

[0010] A first processing module, configured to perform FTN processing on at least two modulation symbol sets respectively;

[0011] a mapping module, configured to map the processed at least two modulation symbol sets to a plurality of subcarriers respectively to generate a multicarrier FTN signal;

[0012] A first sending module, configured to send the multi-carrier FTN signal;

[0013] The modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers.

[0014] In a third aspect, a signal transmission method is provided, the method comprising:

[0015] The receiving end receives a multi-carrier FTN signal carrying at least two modulation symbol sets through multiple subcarriers;

[0016] The modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers;

[0017] The receiving end demodulates the multi-carrier FTN signal.

[0018] In a fourth aspect, a signal transmission device is provided, comprising:

[0019] A first receiving module is configured to receive, via a plurality of subcarriers, a multicarrier FTN signal carrying at least two modulation symbol sets; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the plurality of subcarriers include non-orthogonal subcarriers;

[0020] A demodulation module is used to demodulate the multi-carrier FTN signal.

[0021] In the fifth aspect, a network side device is provided, which includes a processor, a memory, and a program or instruction stored in the memory and runnable on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0022] In a sixth aspect, a network-side device is provided, comprising a processor and a communication interface, wherein the processor is configured to perform FTN processing on at least two modulation symbol sets, respectively, and map the processed at least two modulation symbol sets to multiple subcarriers, respectively, to generate a multi-carrier FTN signal; and the communication interface is configured to transmit the multi-carrier FTN signal.

[0023] The modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers.

[0024] In the seventh aspect, a terminal device is provided, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the third aspect.

[0025] In an eighth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is configured to receive, via multiple subcarriers, a multicarrier FTN signal carrying at least two modulation symbol sets; the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers;

[0026] The processor is configured to demodulate the multi-carrier FTN signal.

[0027] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the third aspect are implemented.

[0028] In the tenth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method described in the first aspect, or to implement the method described in the third aspect.

[0029] In the eleventh aspect, a computer program / program product is provided, which is stored in a non-volatile storage medium, and the program / program product is executed by at least one processor to implement the steps of the signal transmission method as described in the first aspect, or to implement the steps of the signal transmission method as described in the third aspect.

[0030] In an embodiment of the present application, the transmitting end performs FTN processing on at least two modulation symbol sets respectively; the transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal; the transmitting end sends the multi-carrier FTN signal; wherein, the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers. In this way, by introducing FTN transmission, when the modulation waveforms of at least two modulation symbol sets partially overlap, multiple modulation symbol sets can be superimposed and multiplexed on time domain resources; when the subcarriers carrying at least two modulation symbol sets are non-orthogonal, multiple modulation symbol sets can be superimposed and multiplexed on frequency domain resources, so that each signal sample point finally transmitted includes the superposition from multiple modulation symbol sets, thereby improving resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a block diagram of a wireless communication system to which embodiments of the present application may be applied;

[0032] Figure 2 This is a flowchart of the first signal transmission method provided in an embodiment of the present application;

[0033] Figure 3 is a block diagram of a multi-carrier FTN system;

[0034] Figure 4 It is a waveform diagram of a signal without time domain overlap and a signal with time domain overlap;

[0035] Figure 5This is a schematic diagram of the effect of multi-carrier FTN signal;

[0036] Figure 6a This is one of the data frame diagrams for generating multi-carrier FTN signals based on FTN technology;

[0037] Figure 6b This is the second data frame diagram of generating multi-carrier FTN signals based on FTN technology;

[0038] Figure 7 It is a schematic diagram of comb subcarrier allocation;

[0039] Figure 8 is a flow chart of a second signal transmission method provided in an embodiment of the present application;

[0040] Figure 9 This is a structural diagram of a first signal transmission device provided in an embodiment of the present application;

[0041] Figure 10 is a structural diagram of a second signal transmission device provided in an embodiment of the present application;

[0042] Figure 11 This is a structural diagram of a communication device provided in an embodiment of the present application;

[0043] Figure 12 This is a structural diagram of a network-side device provided in an embodiment of the present application;

[0044] Figure 13 This is a structural diagram of a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0046] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0047] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to applications other than NR system applications, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0048] Figure 1The block diagram of a wireless communication system applicable to the embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network-side device 12. Among them, the terminal 11 can also be called a terminal device or a user terminal (User Equipment, UE). The terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (Mobile Internet Device, MID), a wearable device (Wearable Device) or a vehicle-mounted device (VUE), a pedestrian terminal (PUE) and other terminal devices. Wearable devices include: smart watches, bracelets, headphones, glasses, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 can be a base station or a core network, where the base station can be called a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting and receiving point (Transmitting Receiving Point, TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

[0049] The signal transmission method, apparatus, network-side device, terminal device, and readable storage medium provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

[0050] See also Figure 2 The execution subject of the first information transmission method provided in the embodiment of the present application is the sending end. For the convenience of explanation, the following embodiments are illustrated by taking the sending end as the network side device as an example. Figure 2 As shown, the first information transmission method may include the following steps:

[0051] Step 201: The transmitting end performs FTN processing on at least two modulation symbol sets respectively.

[0052] Step 202: The transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal.

[0053] Step 203: The transmitting end sends the multi-carrier FTN signal; wherein, the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers.

[0054] In a specific implementation, the above-mentioned modulation symbol set can be expressed as: a set from multiple modulation symbol streams, and each modulation symbol stream can include multiple modulation symbols. In actual applications, user data is modulated to obtain the above-mentioned modulation symbol stream. For ease of explanation, the following embodiments are illustrated by taking the modulation symbols as Quadrature Amplitude Modulation (QAM) symbols as an example.

[0055] In addition, the transmitting end separately performs FTN processing on the at least two modulation symbol sets, which may include: introducing inter-symbol interference through FTN mapping to achieve non-orthogonal mapping of the at least two modulation symbol sets on time domain resources. The transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers to generate a multicarrier FTN signal, which can be understood as: causing the multiple subcarriers carrying the multicarrier FTN signal to include non-orthogonal subcarriers, thereby achieving non-orthogonal mapping of the at least two modulation symbol sets on frequency domain resources.

[0056] That is to say, the embodiment of the present invention adopts the FTN mapping method, which can perform non-orthogonal superposition of the waveforms of multiple modulation symbol sets at the sampling point to achieve an equivalent non-orthogonal effect of time-frequency domain resources. Then, it can also realize non-orthogonality of multiple FTN symbol sets in frequency domain resources through multi-carrier non-orthogonal mapping, thereby realizing overlapping multiplexing of frequency domain resources to improve resource utilization, and can flexibly adjust the degree of data multiplexing in time domain resources and / or frequency domain resources.

[0057] It should be noted that the FTN in the embodiments of the present application may include at least one of time-domain FTN and frequency-domain FTN (which may also be referred to as Spectrally Efficient Frequency Division Multiplexing (SEFDM)). For ease of explanation, in the following embodiments, the above-mentioned time-domain FTN and frequency-domain FTN are collectively referred to as FTN. This FTN is currently believed to be a new signal processing technology that can break through the Nyquist sampling rate and further approach the physical limit of channel capacity. Its derivative technology is Overlapped X Domain Multiplexing (OVXDM) technology, which includes a combination of Overlapped Time Division Multiplexing (OVTDM), Overlapped Frequency Division Multiplexing (OVFDM), and Overlapped Code Division Multiplexing (OVCDM).

[0058] Based on waveform coding theory, FTN technology artificially introduces inter-symbol interference (ISI) and / or inter-channel interference (ICI) in the time / frequency domain, thereby increasing the code element transmission rate and the equivalent channel capacity. At the same time, the waveform-coded signal places higher demands on the performance of the receiver, increasing the complexity of the decoding algorithm and the power consumption of the hardware. Generally speaking, the greater the time-frequency domain overlap coefficient during waveform coding, that is, the more severe the artificially introduced ISI and ICI, the more states the receiver needs to judge and the higher the complexity of the receiving algorithm. However, advanced decoding algorithms can suppress the negative effects of increased bit error rate. Overall, the channel capacity can still be improved by accelerating the code element transmission rate.

[0059] The FTN signal can be expressed by the following formula:

[0060]

[0061] Where s(t) represents the FTN signal; x(t) represents the transmitted symbol sequence; a k,n represents the modulation symbol sample; h(t) represents the shaping filter impulse response; k is any integer between 1 and K, and K represents the number of subcarriers; n is any integer between 1 and N, and N represents the number of modulation symbol sets included in a group of modulation symbol sets; T Δrepresents the sampling point interval (i.e., time domain interval) after multi-carrier FTN processing, and T Δ =τT, τ∈(0,1), τ is the time domain overlap coefficient. In particular, in OVXDM, Therefore, there is f Δ represents the subcarrier spacing (i.e., frequency domain spacing) after multicarrier FTN processing, and ζ∈(0,1), ζ is the frequency domain overlap coefficient. In particular, in OVXDM, Therefore, there is Represents the QAM symbol at time t.

[0062] It should be noted that the above expression of the FTN signal s(t) is only an example. In actual applications, the FTN signal can also be expressed and calculated using other expressions specified in the protocol or that may appear in the future, which does not constitute a specific limitation here.

[0063] Furthermore, assuming that the impulse response function of the multipath channel is h CH (t), then the FTN signal after passing through the channel can be equivalently expressed as the following formula:

[0064]

[0065] Where s′(t) represents the FTN signal after passing through the channel; h CH (t) represents the channel impulse response; Represents the modulation symbol sample point; Indicates the subcarrier spacing (i.e., frequency domain spacing) after experiencing multicarrier FTN and channel; Indicates the sampling point interval (i.e., time domain interval) after experiencing multi-carrier FTN and channel;

[0066] The signal y(t) received by the receiver of the above FTN signal can be expressed as the following formula:

[0067] y(t)=s′(t)+w(t)

[0068] Where w(t) represents Gaussian white noise.

[0069] Corresponding to the above expression of the FTN signal s(t), the above expression of the FTN signal s′(t) after passing through the channel and the expression of the signal y(t) received on the receiver side are also only examples. In actual applications, the expression of the FTN signal s′(t) after passing through the channel and the signal y(t) received on the receiver side can also be expressed and calculated using other expressions specified in the protocol or that may appear in the future, which does not constitute a specific limitation here.

[0070] It should be noted that, in the present invention, the overlap coefficient is The FTN signal is equivalent to an OVTDM signal with K overlapping layers. For the sake of convenience, in the following embodiments, FTN is used to refer to the super-Nyquist signal family represented by FTN / OVTDM, and the overlapping coefficient is used as a description method to represent the characteristics of super-Nyquist signals such as FTN / OVTDM.

[0071] like Figure 4 As shown in FIG. 1 , when T=0.8, that is, when the time domain overlap coefficient τ of the modulation waveform is 0.8, the amplitude of the pulse waveform carrying the information of other sampling points in the processed FTN signal is not zero at each sampling point, that is, ISI is introduced.

[0072] Similarly, by setting the frequency domain overlap coefficient ζ to be less than 1, ICI can be introduced.

[0073] In practical applications, the above-mentioned time domain overlap coefficient and frequency domain overlap coefficient are respectively related to the subcarrier spacing or the pulse peak spacing of the modulation waveform. Therefore, the values ​​of the time domain overlap coefficient and the frequency domain overlap coefficient can be reduced by reducing the sampling point spacing, the subcarrier spacing or the pulse peak spacing of the modulation waveform, thereby increasing the degree of multiplexing of the modulation symbols in the time domain resources and the frequency domain resources.

[0074] For example, assuming that two users each have a modulation symbol set of length L, if each user's sample points are sent according to Nyquist sampling, the time required is T, and the time required for a single modulation symbol is T / L. The signal transmission method provided in the embodiment of the present application can flexibly adjust the time domain overlap coefficient in the time domain FTN, which can specifically include the following two situations:

[0075] 1) After the modulation symbol sets of the two users are interleaved into a target modulation symbol set of length 2L, they are sent again according to Nyquist sampling. The time required is 2T, and the time required for a single modulation symbol is 2T / 2L. At this time, the time domain overlap coefficient is 1.

[0076] 2) After the modulation symbol sets of the two users are interleaved into a target modulation symbol set of length 2L, if they are sent according to FTN sampling, the time required is qT (q < 2), and the time required for a single modulation symbol is qT / 2L. At this time, the time domain overlap coefficient is equal to q / 2.

[0077] The value of q is related to the time interval between adjacent FTN sampling points, and q is always less than 2. In particular, when q is equal to 1, the modulation symbol sets of the two users are interleaved into a target modulation symbol set of length 2L, which is then transmitted according to FTN sampling. The time required is T, and the time required for a single modulation symbol is T / 2L. At this time, the time domain overlap coefficient is 1 / 2.

[0078] Similarly, the frequency domain overlap coefficient in SEFDM can also be adjusted by adjusting the waveform pulse peak spacing.

[0079] For example, assuming two users each have a modulation symbol set of length L, and if each user's samples are sent separately according to OFDM, the required bandwidth is B, and the sub-carrier spacing (SCS) is B / L. The signal transmission method provided in the embodiment of the present application can flexibly adjust the frequency domain overlap coefficient, which can specifically include the following two situations:

[0080] 1) After the modulation symbol sets of the two users are interleaved into a target modulation symbol set of length 2L, if they continue to be sent according to the SCS of B / L, the required bandwidth is 2B, and the frequency domain overlap coefficient is 1;

[0081] 2) After the modulation symbol sets of the two users are interleaved into a target modulation symbol set of length 2L, if they are sent according to the reduced SCS, assuming that the required bandwidth is pB (p<2), then the SCS is pB / 2L, and the frequency domain overlap coefficient at this time is equal to p / 2.

[0082] The value of p is related to the SCS and is always less than 2. In particular, when p is equal to 1, the modulation symbol sets of the two users are interleaved into a target modulation symbol set of length 2L and then transmitted according to the reduced SCS. The required bandwidth is B, the SCS is B / 2L, and the frequency domain overlap factor is 1 / 2.

[0083] In order to more intuitively represent the degree of multiplexing of FTN signals in time domain resources after the above ISI is introduced, Figure 4 In the figure shown, the FTN signal with ISI introduced (T=0.8) is compared with the FTN signal without ISI introduced (T=1). Figure 4 It can be seen that in this embodiment of the present invention, by compressing the distance between adjacent subcarriers in the frequency domain, more data can be sent within the same bandwidth, thereby improving bits / Hz. Similarly, in the time domain, by shortening the time between adjacent sampling points, more data can be sent within the same time, thereby improving bits / s. Therefore, the overall effect is an increase in bits / Hz / s, that is, an improvement in spectral efficiency per unit time.

[0084] In order to illustrate the effect of multi-carrier FTN in more detail, Figure 5 Take the FTN effect diagram shown below as an example for detailed description: Figure 5 The solid dots in the figure represent symbols orthogonally mapped in the time-frequency domain, and the time domain interval between adjacent symbols satisfies the Nyquist sampling interval, while the frequency domain interval satisfies the subcarrier orthogonality condition; Figure 5The “×” in the figure represents the FTN symbol, and the dotted arrow next to the “×” represents ISI / ICI. Figure 5 From area A in the figure, it can be seen that ISI is generated between the "×" and the FTN symbols adjacent to it on the left and right. The "×" and the FTN symbols adjacent to it on the left and right are on the same carrier; at the same time, ICI is generated between the "×" and the symbols on the two subcarriers above and below it.

[0085] It's important to note that in complex electromagnetic wave transmission environments, such as those in cities, the presence of numerous scattering, reflection, and refraction surfaces causes wireless signals to arrive at the receiving antenna at different times via different paths. This is known as the multipath effect, caused by signals traveling along different paths. ISI (Inter-signal Integer Scale) occurs when the preceding and following symbols of a transmitted signal arrive simultaneously via different paths, or when the latter symbol arrives within the delay spread of the previous symbol. Similarly, in the frequency domain, due to factors such as frequency offset and the Doppler effect, the subcarriers of the signal experience varying degrees of frequency offset, causing overlap of subcarriers that might otherwise be orthogonal, thus generating ICI. The combined effects of ISI / ICI introduced by waveform coding during transmission place even higher demands on the receiver's decoding capabilities. In this case, more sophisticated receiver algorithms are required to combat fading channels. For example, methods such as channel pre-equalization and iterative algorithms for joint channel decoding can be employed.

[0086] Furthermore, in practical applications, network-side equipment can determine whether to introduce ISI / ICI based on factors such as user needs, channel quality, and environmental interference intensity. For example, in high-SNR regions, noise has a relatively small impact on the received signal, making it easier for the receiver to correctly decode based on the known inter-symbol coding constraints of FTN / OVTDM, resulting in a very low bit error rate (BER), thus allowing for ISI / ICI. In contrast, in low-SNR regions, noise has a relatively large impact on the received signal, disrupting the inter-symbol coding constraints and leading to a higher BER. In this case, network-side equipment can decide not to introduce or reduce the introduction of ISI / ICI.

[0087] In summary, in the embodiments of the present application, by introducing FTN transmission, different modulation waveforms can be non-orthogonally superimposed at the sampling point, thereby achieving an equivalent non-orthogonal effect of time-frequency domain resources; moreover, by controllable superposition of different modulation waveforms, the data can present a certain non-orthogonal effect in the time domain and / or frequency domain, that is, the embodiment of the present application can adjust the multiplexing level between the data, thereby achieving flexible configuration of the utilization of time-frequency resources.

[0088] It should be noted that the network-side device needs to perform certain data processing on the original data to be sent to form the above-mentioned at least two modulation symbol sets.

[0089] For example: Figure 3 As shown, at the transmitting end, after the original data (Original Data) is input, the data is encoded (Encoding), interleaved (Interleaver), digitally modulated (Digital Modulation), channel coded (Channel Coding), synchronization frame added (Synchronization Pilot adding) and other processing, and then FTN mapping is performed to output the modulation symbol set as a time domain waveform, so as to perform multi-carrier modulation (MulticarrierModulation) and pulse shaping (Pulse Shaping) on ​​the FTN symbol set to achieve the modulation of the FTN symbol set onto a group of non-orthogonal subcarriers. The above-mentioned multi-carrier modulation process may include serial-to-parallel conversion processing and subcarrier mapping processing, wherein the FTN symbol set is formed into a multi-carrier FTN symbol set after serial-to-parallel conversion and pulse shaping, so as to be carried on multiple subcarriers.

[0090] Correspondingly, such as Figure 3 As shown, at the receiving end, the received multi-carrier FTN signal needs to be demodulated corresponding to the above-mentioned multi-carrier modulation process, for example: multi-carrier demodulation (Multicarrier Demodulation), FTN mapping (FTN Demapper), matched filtering (Match Filter), channel estimation (Channel Estimation), equalization (Equalization), digital demodulation (Digital Demodulation), deinterleaving (Deinterleaver), decoding (Decoding) and other processing to obtain the final calculated data (Estimated Data). The processing process of the received multi-carrier FTN signal at the above-mentioned receiving end corresponds to the processing process of the multi-carrier FTN signal obtained by the transmitting end from the original data, and will not be repeated here.

[0091] It should be noted that the above-mentioned multiple subcarriers may also include orthogonal subcarriers. In this case, the FTN symbols carried on the mutually orthogonal subcarriers are orthogonal to each other, so that non-orthogonal multiplexing is not performed.

[0092] In actual applications, network-side devices can perform non-orthogonal mapping of FTN signals on time domain resources, or non-orthogonal mapping on frequency domain resources, or non-orthogonal mapping on time domain resources and frequency domain resources respectively according to actual needs.

[0093] In a specific implementation, the at least two modulation symbol sets may include: modulation symbol sets of at least two user groups, and each user group includes at least two users;

[0094] or,

[0095] The at least two modulation symbol sets include modulation symbol sets of at least two users, and the modulation symbol set of a same user includes modulation symbols of different layers.

[0096] The modulation symbol sets of different layers for the same user indicate that data of the same user is transmitted in layers, so that the modulation symbol sets of the same user include modulation symbol sets of different layers.

[0097] In case 1, when the at least two modulation symbol sets include: modulation symbol sets of at least two user groups, and each user group includes at least two users, the at least two modulation symbol sets may include K1 groups of first modulation symbol sets, and each group of the first modulation symbol set includes modulation symbols of N1 users, and K1 and N1 are integers greater than 1.

[0098] That is, it includes data of K1 user groups in total, and the K1 user groups correspond one-to-one to K1 groups of first modulation symbol sets. Then each group of the first modulation symbol set may include modulation symbols of N1 users in its corresponding user group.

[0099] At this time, the modulation symbol sets of the N1 users in the same user group can be mapped through FTN to introduce inter-symbol interference to achieve non-orthogonal mapping on the time domain resources, and after FTN mapping, K1 FTN symbol sets are obtained respectively; then, the K1 FTN symbol sets corresponding to different user groups are multi-carrier modulated. At this time, if the subcarriers selected in the multi-carrier modulation are non-orthogonal, the FTN symbol sets of different groups of users are non-orthogonal, so that the data of different groups of users are non-orthogonal mapped on the frequency domain resources. Of course, if the subcarriers selected in the multi-carrier modulation are orthogonal, the FTN symbol sets of different groups of users are orthogonal, so that the data of different groups of users are not non-orthogonally multiplexed on the frequency domain resources.

[0100] Case 2: When the at least two modulation symbol sets include: modulation symbol sets of at least two users, and the modulation symbol sets of the same user include modulation symbols of different layers, the at least two modulation symbol sets may include K2 groups of second modulation symbol sets, and each group of the second modulation symbol sets includes N2 layers of modulation symbols of one user, and K2 and N2 are integers greater than 1.

[0101] That is to say, a total of K2 users' data are included, and the K2 users correspond one-to-one to K2 groups of second modulation symbol sets. Then each group of the second modulation symbol set can include the N2-layer modulation symbol set of its corresponding user.

[0102] Similar to the previous embodiment, in this embodiment, the data between different layers of the same user are subjected to inter-symbol interference through FTN mapping, thereby realizing non-orthogonal mapping on the time domain resources, and after FTN mapping, K2 FTN symbol sets are obtained respectively; then, the K2 FTN symbol sets corresponding to different users are multi-carrier modulated. At this time, if the subcarriers selected in the multi-carrier modulation are non-orthogonal, the FTN symbol sets of different users are non-orthogonal, thereby realizing non-orthogonal mapping of the data of different users on the frequency domain resources. Of course, if the subcarriers selected in the multi-carrier modulation are orthogonal, the FTN symbol sets of different users are orthogonal, and at this time, the data of different users are not non-orthogonally multiplexed on the frequency domain resources.

[0103] As an optional implementation manner, before the transmitting end performs FTN processing on the at least two modulation symbol sets respectively, the method further includes:

[0104] The transmitting end mixes the first modulation symbol set or the second modulation symbol set in the same group into a target modulation symbol set to obtain K3 target modulation symbol sets, wherein the at least two modulation symbol sets include the K3 target modulation symbol sets, each target modulation symbol set includes L modulation symbols, K3 represents the number of groups of the first modulation symbol set or the second modulation symbol set, and L represents the length of each modulation symbol set in the first modulation symbol set or the second modulation symbol set;

[0105] The transmitting end performs FTN processing on at least two modulation symbol sets respectively, including:

[0106] The transmitting end performs FTN non-orthogonal mapping processing on the K3 target modulation symbol sets respectively to obtain K3 FTN symbol sets;

[0107] The transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal, including:

[0108] The transmitting end performs multi-carrier modulation processing on the K3 FTN symbol sets to obtain the multi-carrier FTN signal.

[0109] It should be noted that the above-mentioned first modulation symbol set is the same as in the previous embodiment, including the first modulation symbol set of modulation symbols of N1 users in a user group; and the above-mentioned second modulation symbol set is the same as in the previous embodiment, including the second modulation symbol set of N2 layers of modulation symbols of a user, which will not be elaborated on here. In addition, when the network side device mixes the modulation symbols of the same user group, K3 is equal to K1, and when the network side device mixes the modulation symbols of each layer of the same user, K3 is equal to K2. For the sake of convenience, the following embodiments take the example of the network side device mixing the modulation symbols of the same user group as an example to illustrate the FTN baseband signal processing process in this embodiment. For the way in which the network side device mixes the modulation symbols of different layers of the same user into a target modulation symbol set, reference can be made to the description of the above-mentioned network side device mixing the modulation symbols of the same user group.

[0110] First, the network-side device combines the modulation symbols within the same user group into target modulation symbol sets, obtaining K3 target modulation symbol sets. This can be understood as follows: the interleaver in the network-side device combines at least two modulation symbol streams within the same user group according to a specific rule to obtain a target modulation symbol set corresponding to the user group. Furthermore, different interleaving patterns can be configured for different users through interleaver configuration parameters, thereby controlling the different amounts of resources occupied by different users and the degree of resource reuse among different users.

[0111] The at least two modulation symbol streams in the same user group are mixed according to a certain rule, which may include: mixing the at least two modulation symbol streams in the same user group according to any interleaving mode such as uniform interleaving and non-uniform interleaving.

[0112] For example, suppose a user group includes user A and user B, and the data belonging to user A is represented as u A , the data belonging to user B is represented as u B ,u A and u B The lengths of the two data can be the same or different. After modulation and preprocessing, the modulation symbol stream s is obtained. A and s B , the s A and s B The lengths can also be the same or different.

[0113] 1) If s A and s B The length of the interleaver is different, the interleaver can A and s B Perform non-uniform interleaving to output the target modulation symbol set s ABFor example: suppose s A It is B Twice the length, then s AB Two of the three adjacent target modulation symbols in s A The modulation symbol and a B The modulation symbols in .

[0114] 2) If s A and s B If the lengths are the same, then a uniform interweaving method can be used to interweave s A and s B Interspersed and mixed with each other to obtain the target modulation symbol set s AB .

[0115] For another example: Assume that a user group includes user A, user B and user C, then there are three modulation symbol streams s corresponding to users A, B and C. A 、s B and s c , at this time, you can make s A and s B Connect end to end to form a modulation symbol stream ps AB , then use ps AB With s c Interleave to obtain the target modulation symbol set s ABc , and finally the target modulation symbol set s ABc When FTN mapping is performed, in the FTN symbol set obtained after FTN mapping, there is waveform resource multiplexing (i.e., ISI) between the modulation symbols of user A and user C, and there is also waveform resource multiplexing between the modulation symbols of user B and user C, but there is no waveform resource multiplexing between the modulation symbols of user A and user B.

[0116] In practical applications, the configuration information of the interleaver mainly includes: the number of users to be interleaved and the indication of the interleaving mode. The indication of the interleaving mode can be indicated to the terminal device on the receiving side using a table lookup method, or the configuration information of the interleaver can be configured to the terminal device on the receiving side through a broadcast message or a unicast message. It can be seen from the above that by configuring the number of user data to be interleaved and the interleaving mode in the interleaver, the utilization rate of the modulation symbols of different users in the time domain resources can be adjusted.

[0117] In a second aspect, the receiving end performs multi-carrier modulation processing on the K3 FTN symbol sets, including at least one of the following:

[0118] The transmitting end maps the K3 FTN symbol sets to K3 subcarriers respectively, wherein the subcarriers occupied by FTN symbols in different FTN symbol sets are non-orthogonal;

[0119] The transmitting end maps K3 FTN symbol sets to at least two groups of subcarriers, wherein the subcarrier group carrying the FTN signal includes the at least two groups of subcarriers, the subcarriers occupied by the same FTN symbol set are orthogonal, and the subcarriers occupied by different FTN symbol sets are non-orthogonal.

[0120] Implementation Method 1

[0121] The transmitting end maps the K3 FTN symbol sets to K3 subcarriers respectively, which can be understood as: the network side device maps the K3 FTN symbol sets to K3 subcarriers in a one-to-one correspondence.

[0122] For example: Figure 6a As shown, assuming that there are k groups of users, each group of users includes n users, then u ij The modulation symbol stream representing the jth user in the i-th user group can be input into the pre-processing module for certain pre-processing as needed. The pre-processed data is then grouped as needed. For example, different powers can be assigned to the modulation symbols of different users, or different orders of QAM modulation can be performed on the data of different users. In this case, users with the same allocated power can be assigned to the same group, or users with the same order of QAM modulation can be assigned to the same group. The modulation symbol stream of each user group is then input into the interleaver for stream mixing, so that the modulation symbol streams of each user in the same user group are mixed according to certain rules into a target modulation symbol set. The interleaved target modulation symbol set is then subjected to FTN mapping, i.e., the target modulation symbol set is first upsampled by an upsampling module, and then pulse shaping is performed on the upsampled modulation symbol stream. Then, through multi-carrier mapping, the K FTN symbol sets obtained after FTN mapping are modulated onto K subcarriers respectively, so as to send multi-carrier FTN signals through K subcarriers.

[0123] The above preprocessing module mainly performs the following three processing processes:

[0124] Scrambling is a process that randomizes the data sequence to reduce the correlation between data streams. It can also implicitly carry some information by using operations such as blind detection of scrambling codes.

[0125] Power allocation, also known as QAM symbol amplitude scaling, allows different users to use different transmit powers to accommodate different levels of service or application.

[0126] Zero-interleaving is performed to adjust the following two parameters of the generated FTN symbol set: 1) the degree of overlap of data within the same user group; and 2) the degree of overlap of data between different user groups.

[0127] In practice, the preprocessing configuration mainly includes the following information:

[0128] 1) Allocation of scramblers to different users;

[0129] 2) Power allocation for different users;

[0130] 3) Zero interleaving mode for different users, for example:

[0131] a) A 1-bit zero-interleaving flag is used to indicate whether zero interleaving is on or off;

[0132] i. When the zero interleaving flag is on, a sufficient number of zeros is added between adjacent symbol samples so that after FTN mapping, there is no ISI between the symbol samples from the same user. The sufficient number here refers to greater than or equal to 1 / 2 of the number of main lobe sampling points of the shaping filter, which can be obtained from the shaping filter coefficients;

[0133] ii. When the zero interleaving flag is off, no operation is performed.

[0134] b) Use an x-bit zero interleaving pattern to indicate that different numbers of zeros are inserted between adjacent symbol samples.

[0135] In actual applications, the above-mentioned pre-processed configuration information can be sent or broadcast to the terminal device on the receiving side, for example, configured to the terminal device on the receiving side through a broadcast message or a unicast message.

[0136] Furthermore, the FTN symbol set (which can also be called signal sample point) output by the FTN mapping module can be further multi-carrier modulated and mapped to multiple continuous subcarriers through serial-to-parallel conversion. Unlike traditional multi-carrier systems (such as OFDM), the multiple subcarriers are not orthogonal.

[0137] It is worth noting that the multi-carrier mapping method adopted by the FTN mapping module in the embodiment of the present application is similar to the OFDM system in the prior art. In the OFDM system, it is assumed that an OFDM symbol has N subcarriers, carrying N QAM symbols X k =X(k), k∈[0, N-1], where X k represents the QAM symbol set, X(k) represents X k The kth QAM symbol in the subcarrier. The operational relationship between the actually transmitted time domain sample point x(n) and the QAM symbol on the subcarrier can be expressed as the following formula:

[0138]

[0139] Among them, IFFT(X k ) represents Fourier transform.

[0140] The orthogonality of the subcarriers in the above transformation is actually determined by Guaranteed, from Euler's theorem and the properties of trigonometric functions: for any two subcarriers k and l, they satisfy Both k and l belong to [0, N-1], and k≠l, where <·> represents the inner product.

[0141] However, the multi-carrier mapping in the embodiment of the present application uses non-orthogonal subcarriers. The operational relationship between the time domain sample x(n) actually sent in the embodiment of the application and the QAM symbol on the subcarrier can be expressed as the following formula:

[0142]

[0143] For any two non-orthogonal subcarriers k and l, they satisfy

[0144] Wherein, k and l both belong to [0, N-1], and k≠l.

[0145] As can be seen from the above, in the embodiment of the present application, only a set of subcarriers whose subcarrier spacing meets the following conditions need to be used:

[0146]

[0147] By modulating the transmitted symbols, a SEFDM signal can be constructed. Figure 6a In the illustrated embodiment, if the input during multi-carrier mapping is an FTN symbol set, the final output signal is a multi-carrier FTN signal.

[0148] Implementation Method 2

[0149] The transmitting end maps K3 FTN symbol sets to at least two groups of subcarriers, which can be understood as: the network side device maps K3 FTN symbol sets to at least two subcarriers respectively.

[0150] In this embodiment, the subcarriers occupied by the same FTN symbol set may be orthogonalized through comb-like allocation of subcarriers, while the subcarriers occupied by different FTN symbol sets may be non-orthogonalized.

[0151] For example: Figure 6b As shown in the figure, assuming that the total number of subcarriers is N×K and there are K FTN symbol sets of length N, a different set of subcarriers is allocated to different FTN symbol sets using the comb allocation of subcarriers, which can be expressed as follows:

[0152] {f k (n), k=Kn+(k-1), n=0, 1,..., N-1}

[0153] Among them, f k (n) represents the set sum of a group of subcarriers allocated to the kth FTN symbol set, and when k is any integer from 0 to K-1, the subcarrier group allocated to each FTN symbol set is determined respectively.

[0154] And the subcarrier spacing meets the following conditions:

[0155]

[0156] That is {f k (n)}, the subcarriers between them are orthogonal to each other, and {f k (n)} and {f k′ The subcarriers between {f (n)} are not orthogonal to each other. k (n)} represents the subcarriers allocated to the same FTN symbol set; {f k (n)} and {f k′ The subcarriers between (n)} represent the subcarriers allocated to different FTN symbol sets.

[0157] In this way, the FTN symbol set output after FTN mapping can be subjected to serial-parallel conversion (S / P) to modulate an FTN symbol set onto a group of subcarriers allocated thereto.

[0158] For example: Figure 7 As shown, assuming that from left to right, the subcarriers arranged at odd positions are orthogonal to each other, and the subcarriers arranged at even positions are orthogonal to each other, and the subcarriers at odd and even positions are not orthogonal to each other, then one set of FTN symbol sets can be modulated with the subcarriers at odd positions, and another set of FTN symbol sets can be modulated with the subcarriers at even positions, as shown in FIG. Figure 7As shown in the figure, the arrangement of the 6 subcarriers on the left: x(1), x(2), x(3), x(4), x(5), x(6) is taken as an example, where x(1), x(3) and x(5) are subcarriers arranged at odd positions, so x(1), x(3) and x(5) are orthogonal to each other, while x(2), x(4) and x(6) are subcarriers arranged at even positions, so x(2), x(4) and x(6) are orthogonal to each other, and x(1), x(3) and x(5) are non-orthogonal to x(2), x(4) and x(6) respectively.

[0159] like Figure 6b The embodiment shown is similar to Figure 6a The difference of the embodiment shown is that: for a set of FTN samples of length L, assuming the sample time is T s ,use Figure 6a The time required to complete the modulation of the group of samples in the embodiment shown is L×T s . And use Figure 6b The time required for the embodiment shown to complete the modulation of the group of samples is only T s In other words, this embodiment is different from Figure 6a In the illustrated embodiment, instead of modulating an FTN modulation symbol set onto one subcarrier, an FTN modulation symbol set is modulated onto multiple subcarriers. This can shorten the modulation time of the FTN signal samples when applied to resource-rich application scenarios.

[0160] Furthermore, the multi-carrier FTN technology can also be combined with the existing NOMA technology to introduce partial overlapping multiplexing between the modulation waveforms of different users during baseband processing using the multi-carrier FTN technology, thereby simultaneously sending data from multiple users within limited non-orthogonal time-frequency resources. The specific process of introducing partial overlapping multiplexing between the modulation waveforms of different users during baseband processing using the multi-carrier FTN technology can be referred to as follows. Figure 6a or Figure 6b The multi-carrier FTN mapping process shown is not repeated here.

[0161] As an optional implementation manner, the transmitting end sending the multi-carrier FTN signal includes:

[0162] The transmitting end transmits the multi-carrier FTN signal in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

[0163] In a specific implementation, the above-mentioned network side device sends the multi-carrier FTN signal in at least one of the non-orthogonal time domain resources and the non-orthogonal frequency domain resources, which can be understood as: using multi-carrier FTN to process the baseband signal so that at least two modulation symbol sets are superimposed and multiplexed, so that each transmitted sample point at the transmitting antenna end is a superposition of modulation symbols from multiple users; then, further non-orthogonal multiplexing is achieved through NOMA technology, such as: Sparse Code Multiple Access (SCMA), Pattern Division Multiple Access (PDMA), Multi-User Shared Access (MUSA), Resource spread multiple access (RSMA), etc.

[0164] It should be noted that multi-user non-orthogonal technology is generally divided into bit-level non-orthogonality and symbol-level non-orthogonality. The NOMA in the embodiment of the present application specifically refers to the symbol-level non-orthogonal technology.

[0165] The NOMA technology in related technologies usually adopts a code division method, which is mainly achieved by multiplexing the data of different users on the same time-frequency resources. This is equivalent to superimposing QAM symbols carrying data of different users layer by layer on the same time-frequency resources. The distinction of the QAM symbols is mainly achieved through different non-orthogonal codebooks and transmission powers. Its performance is greatly affected by the codebook design. Moreover, for the receiving side, it is usually necessary to use a minimum mean square error-successive interference cancellation (MMSE-SIC) receiver to demodulate the data of different users layer by layer and recover the symbols transmitted by different users. This means that the information of the codebooks used by different users needs to be obtained by the network side through signaling instructions or blind detection technology, which requires a certain amount of communication and computing overhead. The distinction by power domain causes an imbalance in power allocation between users, making it difficult to ensure the quality of service for users in complex network environments. In addition, the error propagation defect of the above-mentioned MMSE-SIC receiver is also difficult to overcome.

[0166] More importantly, traditional NOMA technology only explores user differentiation in the code domain, essentially a CDMA technology with degraded orthogonality. Traditional NOMA technology utilizes time-frequency domain resources in a completely non-orthogonal manner, or achieves partial non-orthogonality through the introduction of sparse data mapping. This is an empirical engineering approach lacking theoretical analysis and discussion, making it difficult to flexibly configure the non-orthogonality of NOMA time-frequency resources as needed.

[0167] The embodiment of the present invention extends the non-orthogonal mapping of the NOMA technology to the waveform domain by introducing the idea of ​​FTN transmission. That is to say, by superimposing multiple modulated waveforms non-orthogonally at the sampling point, an equivalent non-orthogonal effect of time-frequency domain resources is achieved. In this way, by integrating the above-mentioned FTN technology with the NOMA technology, it is possible to achieve controllable superposition of different modulated waveforms, so that different data present a non-orthogonal effect in the time domain / frequency domain. For example: in the process of multi-carrier FTN processing, if the subcarriers selected for carrying the multi-carrier FTN signal are non-orthogonal, the data can be completely non-orthogonal in the frequency domain, and controllably non-orthogonal in the time domain. Specifically, the multiplexing level of different data can be adjusted by adjusting parameters such as the time domain overlapping coefficient.

[0168] As an optional implementation manner, the modulation symbols in the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner;

[0169] The modulation symbols in different groups of the first modulation symbol sets are non-orthogonally multiplexed in a NOMA manner.

[0170] In a specific implementation, the modulation symbols in the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner, which may include at least one of the following:

[0171] The modulation symbols in the same group of the first modulation symbol set are non-orthogonally mapped on the time domain resources in a multi-carrier FTN manner;

[0172] The modulation symbols in the same group of the first modulation symbol set are non-orthogonally mapped on the frequency domain resources in a multi-carrier FTN manner.

[0173] This embodiment is as follows Figure 6a On the basis of the embodiment shown, NOMA, such as SCMA, PDMA, MUSA, RSMA, etc., is also used to implement non-orthogonal multiplexing of FTN signals between user groups to further improve the degree of non-orthogonal multiplexing. In this embodiment, the specific method for implementing: the modulation symbols in the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner is the same as that in the embodiment shown. Figure 6aIn the illustrated embodiment, the manner of implementing non-orthogonal mapping of FTN signals on time domain resources and / or frequency domain resources through FTN modulation and multi-carrier FTN mapping is the same and will not be repeated here.

[0174] As an optional implementation manner, the modulation symbols in the same group of the first modulation symbol set are non-orthogonally multiplexed in a NOMA manner;

[0175] The modulation symbols in different groups of the first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

[0176] The above-mentioned modulation symbols located in the first modulation symbol sets of different groups are non-orthogonally mapped in a multi-carrier FTN manner, specifically including: the above-mentioned modulation symbols located in the first modulation symbol sets of different groups are non-orthogonally mapped in a multi-carrier FTN manner on time domain resources or frequency domain resources, which can be understood as: non-orthogonal mapping of time domain resources is achieved through time domain FTN between user groups, or non-orthogonal mapping of frequency domain resources is achieved through frequency domain FTN.

[0177] In a specific implementation, the non-orthogonal mapping of time domain resources between the above-mentioned user groups through time domain FTN can be achieved by making the transmission delays of the modulation symbols in the first modulation symbol sets of different groups different; and the non-orthogonal mapping of frequency domain resources between the above-mentioned user groups through frequency domain FTN can be achieved by making the modulation symbols in the first modulation symbol sets of different groups use non-orthogonal subcarriers to carry them.

[0178] The difference between this embodiment and the previous optional embodiment is that, in this embodiment, the NOMA method is first used to perform non-orthogonal multiplexing of the modulation symbols in the same group of first modulation symbol sets; and the non-orthogonal mapping of time domain or frequency domain resources is realized between user groups through time domain FTN or frequency domain FTN.

[0179] As an optional implementation manner, the modulation symbols in the same group of the second modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner;

[0180] The modulation symbols in different groups of the second modulation symbol sets are non-orthogonally multiplexed in a NOMA manner.

[0181] This embodiment is similar to the previous embodiment described in which the modulation symbols within the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner; and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally multiplexed in a NOMA manner. The only difference is that this embodiment is targeted at the second modulation symbol set, but the specific implementation methods and principles of the two embodiments are the same and will not be repeated here.

[0182] As an optional implementation manner, the modulation symbols in the same group of the second modulation symbol set are non-orthogonally multiplexed in a NOMA manner;

[0183] The modulation symbols in different groups of the second modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

[0184] The modulation symbols located in the second modulation symbol sets in different groups are non-orthogonally mapped in a multi-carrier FTN manner, specifically including: the modulation symbols located in the second modulation symbol sets in different groups are non-orthogonally mapped in a multi-carrier FTN manner on time domain resources or frequency domain resources, which can be understood as: the data of different users are non-orthogonally mapped in the time domain resources through the time domain FTN, or the non-orthogonal mapping of the frequency domain resources is achieved through the frequency domain FTN.

[0185] In a specific implementation, the data of the above-mentioned different users are non-orthogonal mapped to time domain resources through time domain FTN, which can be achieved by making the transmission delays of the modulation symbols in different groups of the second modulation symbol sets different; and the data of the above-mentioned different users are non-orthogonal mapped to frequency domain resources through frequency domain FTN, which can be achieved by making the modulation symbols in different groups of the second modulation symbol sets use non-orthogonal subcarriers to carry them.

[0186] The difference between this embodiment and the previous optional embodiment is that, in this embodiment, the NOMA method is first used to perform non-orthogonal multiplexing of the modulation symbols in the same group of second modulation symbol sets; and the data of different users are connected through time domain FTN or frequency domain FTN to realize non-orthogonal mapping of time domain or frequency domain resources.

[0187] As an optional implementation, the method further includes:

[0188] The network side device sends indication information, where the indication information is used to indicate a modulation parameter of the multi-carrier FTN signal.

[0189] Furthermore, the modulation parameters include at least one of the following:

[0190] Time domain overlap coefficient;

[0191] Frequency domain overlap coefficient;

[0192] Power allocation parameters for each user or layer;

[0193] Modulation and Coding Scheme (MCS) for each user or layer;

[0194] The position of the zero padding in the modulation symbols of each user or layer.

[0195] The power allocation parameters, MCS and the position of zero padding in the modulation symbol for each user or layer correspond to the configuration parameters of the preprocessing and the interleaver respectively, and are not described in detail here.

[0196] It should be noted that, in practical applications, the modulation parameters may also include other parameters, such as the number of modulation symbol sets mixed in the interleaver, etc., which are not exhaustive here.

[0197] In addition, the above indication information can be transmitted to the receiving end of the multi-carrier FTN signal through any method such as broadcast message, unicast message, downlink control signaling, etc., so that the receiving end can receive and correctly demodulate the multi-carrier FTN based on the modulation parameters.

[0198] Of course, in addition to the above-mentioned sending indication information, the above-mentioned demodulation parameters can also be notified to the receiving end of the multi-carrier FTN signal through other methods such as pre-configuration, which is not specifically limited here.

[0199] For ease of understanding, the signal transmission method provided in the embodiments of the present application is specifically described below using four typical embodiments as examples:

[0200] Example 1

[0201] Assume there are K×N users in total, divided into K groups, with N users in each group. Inter-symbol interference is introduced by FTN mapping within the users in the group, achieving non-orthogonal mapping of time domain resources. The FTN symbol set of each user group is multi-carrier modulated, which can include the following two cases:

[0202] Case 1: When the selected subcarriers are orthogonal, the FTN symbols of different groups of users are orthogonal;

[0203] Case 2: When the selected subcarriers are non-orthogonal, the FTN symbols of different groups of users are non-orthogonal.

[0204] Example 2

[0205] Assume that there are K users in total, and each user's data is transmitted over N layers. Then, the data of different layers of the same user will introduce inter-symbol interference through FTN mapping, realizing non-orthogonal mapping of time domain resources. The FTN symbol sets belonging to different users are multi-carrier modulated, and this multi-carrier modulation can also include the following two cases:

[0206] Case 1: When the selected subcarriers are orthogonal, the FTN symbols of different users are orthogonal;

[0207] Case 2: When the selected subcarriers are non-orthogonal, the FTN symbols of different users are non-orthogonal.

[0208] By further combining the above embodiment 1 with the existing NOMA technology, the following embodiment 3 can be obtained.

[0209] Example 3

[0210] Assume that there are K×N users in total, divided into K groups, with N users in each group. In this case, the above embodiment 1 can be combined with the existing NOMA technology in the following two cases:

[0211] Case 1: The FTN symbol sets of users in a group are non-orthogonally mapped to time domain and / or frequency domain resources through multi-carrier FTN; FTN symbol sets of users in different groups are non-orthogonally multiplexed through NOMA technologies such as SCMA, PDMA, MUSA, and RSMA.

[0212] Case 2: The FTN symbol sets of users in a group are non-orthogonally multiplexed through NOMA technologies, such as SCMA, PDMA, MUSA, and RSMA. The FTN symbol sets of users in different groups are non-orthogonally mapped between time domain or frequency domain resources through time domain FTN or frequency domain FTN.

[0213] Among them, the non-orthogonal mapping of time domain resources is achieved through time domain FTN, which can be achieved by making the transmission delay time between FTN symbol sets of different groups of users different;

[0214] The non-orthogonal mapping of frequency domain resources can be achieved through frequency domain FTN by using non-orthogonal subcarriers to carry FTN symbol sets of different groups of users.

[0215] By further combining the above-mentioned embodiment 2 with the existing NOMA technology, the following embodiment 4 can be obtained.

[0216] Example 4

[0217] Assume that there are N users in total, and each user's data is transmitted in K layers.

[0218] At this point, the above-mentioned embodiment 2 can be combined with the existing NOMA technology in the following two situations:

[0219] Case 1: Data from different layers of the same user are mapped non-orthogonally to time and / or frequency domain resources through multi-carrier FTN; data from different users are multiplexed non-orthogonally through NOMA technologies such as SCMA, PDMA, MUSA, and RSMA.

[0220] Case 2: Non-orthogonal multiplexing is achieved between FTN symbol sets of different layers of the same user through NOMA technology, such as SCMA, PDMA, MUSA, RSMA, etc.; non-orthogonal mapping of time domain or frequency domain resources is achieved between FTN symbol sets of different users through time domain FTN or frequency domain FTN.

[0221] Among them, the non-orthogonal mapping of time domain resources is achieved through time domain FTN, which can be achieved by making the transmission delay time between the FTN symbol sets of different users different;

[0222] The non-orthogonal mapping of frequency domain resources can be achieved through frequency domain FTN by using non-orthogonal subcarriers to carry FTN symbol sets of different users.

[0223] This invention provides a NOMA technology based on multi-carrier FTN. During baseband processing, it exploits the non-orthogonal superposition of modulation waveforms of different users in the time and frequency domains at the sampling moment to achieve highly flexible resource utilization while reducing signaling overhead. The receiving algorithm can continue to use the proven algorithms of multi-carrier FTN technology, avoiding the error propagation shortcomings of the MMSE-SIC receiver algorithm in traditional NOMA schemes.

[0224] See also Figure 8 , is a flow chart of a second signal transmission method provided by an embodiment of the present invention, such as Figure 8 The signal transmission method shown is similar to the Figure 2 The signal transmission method shown is corresponding to that shown in FIG. 1 , except that, Figure 2 The execution subject of the signal transmission method shown is the sending end, and Figure 8 The execution subject of the signal transmission method shown is the receiving end. In a specific implementation, the receiving end can be a terminal device or a network side device. For the sake of convenience, the following embodiments are described with the receiving end being a terminal device as an example. Figure 8 As shown, the second signal transmission method may include the following steps:

[0225] Step 801: A receiving end receives a multi-carrier FTN signal carrying at least two modulation symbol sets through multiple subcarriers; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers.

[0226] The at least two modulation symbol sets and the multi-carrier FTN signal in this step are the same as Figure 2 The at least two modulation symbol sets and the multi-carrier FTN signal in the illustrated method embodiment have the same meaning and are not described in detail here.

[0227] Step 802: The receiving end demodulates the multi-carrier FTN signal.

[0228] In this step, the terminal device may use a demodulation algorithm in the mature multi-carrier FTN technology in the prior art to demodulate the received multi-carrier FTN signal, which will not be elaborated in detail here.

[0229] Optionally, the receiving end receives, through multiple subcarriers, a multicarrier FTN signal carrying at least two modulation symbol sets, including:

[0230] The receiving end receives the multi-carrier FTN signal in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

[0231] Optionally, the method further includes:

[0232] The receiving end receives indication information, where the indication information is used to indicate a modulation parameter of the multi-carrier FTN signal;

[0233] The receiving end demodulating the multi-carrier FTN signal includes:

[0234] The receiving end demodulates the multi-carrier FTN signal according to the modulation parameters of the multi-carrier FTN signal.

[0235] Optionally, the modulation parameter includes at least one of the following:

[0236] Time domain overlap coefficient;

[0237] Frequency domain overlap coefficient;

[0238] Power allocation parameters for each user or layer;

[0239] Modulation and coding strategy (MCS) for each user or layer;

[0240] The position of the zero padding in the modulation symbols of each user or layer.

[0241] The second signal transmission method performed by the terminal device provided in the embodiment of the present application is similar to the Figure 2 The illustrated embodiment corresponds to the first signal transmission method performed by the network side device. In this way, when the network side device flexibly adjusts the multiplexing of the multi-carrier FTN signal in the time domain resources and frequency domain resources during the baseband signal processing and carrier modulation process, the terminal device can use the demodulation algorithm in the mature multi-carrier FTN technology to demodulate the multi-carrier FTN signal received from the network side device, thereby improving the reliability of the modulation process and reducing the signaling overhead and computing power overhead of the terminal device.

[0242] It should be noted that the first signal transmission method provided in the embodiments of the present application can be executed by a signal transmission device, or a control module in the signal transmission device for executing the first signal transmission method. In the embodiments of the present application, the signal transmission device provided in the embodiments of the present application is described by taking the signal transmission device executing the first signal transmission method as an example.

[0243] See also Figure 9 , is a structural diagram of a first signal transmission device 900 provided in an embodiment of the present application, such as Figure 9 As shown, the first signal transmission device 900 includes:

[0244] A first processing module 901 is configured to perform FTN processing on at least two modulation symbol sets respectively;

[0245] A mapping module 902 is configured to map the processed at least two modulation symbol sets to multiple subcarriers to generate a multi-carrier FTN signal;

[0246] A first sending module 903, configured to send the multi-carrier FTN signal;

[0247] The modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers.

[0248] Optionally, the first sending module 901 is specifically configured to:

[0249] The multi-carrier FTN signal is transmitted in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

[0250] Optionally, the multiple subcarriers also include orthogonal subcarriers.

[0251] Optionally, the at least two modulation symbol sets include: modulation symbol sets of at least two user groups, and each user group includes at least two users.

[0252] Optionally, the at least two modulation symbol sets include K1 groups of first modulation symbol sets, and each group of the first modulation symbol sets includes modulation symbols of N1 users, where K1 and N1 are integers greater than 1.

[0253] Optionally, the modulation symbols in the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner;

[0254] The modulation symbols in different groups of the first modulation symbol sets are non-orthogonally multiplexed in a NOMA manner.

[0255] Optionally, the modulation symbols in the same group of the first modulation symbol set are non-orthogonally multiplexed in a NOMA manner;

[0256] The modulation symbols in different groups of the first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

[0257] Optionally, the at least two modulation symbol sets include: modulation symbol sets of at least two users, and the modulation symbol set of the same user includes modulation symbols of different layers.

[0258] Optionally, the at least two modulation symbol sets include K2 groups of second modulation symbol sets, and each group of the second modulation symbol sets includes N2 layer modulation symbols of one user, and K2 and N2 are integers greater than 1.

[0259] Optionally, the modulation symbols in the same group of the second modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner;

[0260] The modulation symbols in different groups of the second modulation symbol sets are non-orthogonally multiplexed in a NOMA manner.

[0261] Optionally, the modulation symbols in the same group of the second modulation symbol set are non-orthogonally multiplexed in a NOMA manner;

[0262] The modulation symbols in different groups of the second modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

[0263] Optionally, the modulation symbols in different groups of first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, or the modulation symbols in different groups of second modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, including:

[0264] The transmission delays of the modulation symbols in different groups of the first modulation symbol set or the second modulation symbol set are different.

[0265] 13. The method according to claim 7 or 11, wherein modulation symbols in different groups of first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, or modulation symbols in different groups of second modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, comprising:

[0266] The modulation symbols in different groups of the first modulation symbol sets or the second modulation symbol sets are carried by non-orthogonal subcarriers.

[0267] Optionally, the first signal transmission device 900 further includes:

[0268] a mixing module, configured to mix the first modulation symbol set or the second modulation symbol set in the same group into a target modulation symbol set, to obtain K3 target modulation symbol sets, wherein the at least two modulation symbol sets include the K3 target modulation symbol sets, each target modulation symbol set includes L modulation symbols, K3 represents the number of groups of the first modulation symbol set or the second modulation symbol set, and L represents the length of each modulation symbol set in the first modulation symbol set or the second modulation symbol set;

[0269] The first processing module 901 is specifically configured to:

[0270] Performing FTN non-orthogonal mapping processing on the K3 target modulation symbol sets respectively to obtain K3 FTN symbol sets;

[0271] The mapping module 902 is specifically configured to:

[0272] Multi-carrier modulation processing is performed on the K3 FTN symbol sets to obtain the multi-carrier FTN signal.

[0273] Optionally, the mapping module 902 includes at least one of the following:

[0274] A first mapping unit is configured to map the K3 FTN symbol sets to K3 subcarriers respectively, wherein the subcarriers occupied by FTN symbols in different FTN symbol sets are non-orthogonal;

[0275] The second mapping unit is used to map K3 FTN symbol sets to at least two groups of subcarriers, wherein the subcarrier group carrying the FTN signal includes the at least two groups of subcarriers, the subcarriers occupied by the same FTN symbol set are orthogonal, and the subcarriers occupied by different FTN symbol sets are non-orthogonal.

[0276] Optionally, the first signal transmission device 900 further includes:

[0277] The second sending module is used to send indication information, where the indication information is used to indicate the modulation parameters of the multi-carrier FTN signal.

[0278] Optionally, the modulation parameter includes at least one of the following:

[0279] Time domain overlap coefficient;

[0280] Frequency domain overlap coefficient;

[0281] Power allocation parameters for each user or layer;

[0282] MCS for each user or layer;

[0283] The position of the zero padding in the modulation symbols of each user or layer.

[0284] The first signal transmission device 900 in this embodiment can achieve Figure 2 The various processes implemented in the first signal processing method embodiment shown achieve the same technical effect, and will not be described again here to avoid repetition.

[0285] Similarly, the second signal transmission method provided in the embodiments of the present application can be executed by a signal transmission device, or a control module in the signal transmission device for executing the second signal transmission method. In the embodiments of the present application, the signal transmission device provided in the embodiments of the present application is described by taking the signal transmission device executing the second signal transmission method as an example.

[0286] See also Figure 10 , is a structural diagram of a second signal processing device provided in an embodiment of the present application, such as Figure 10 As shown, the second signal processing device 1000 includes:

[0287] A first receiving module 1001 is configured to receive, via multiple subcarriers, a multicarrier FTN signal carrying at least two modulation symbol sets; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers;

[0288] The demodulation module 1002 is configured to demodulate the multi-carrier FTN signal.

[0289] Optionally, the first receiving module 1001 is specifically configured to:

[0290] The receiving end receives the multi-carrier FTN signal in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

[0291] Optionally, the second signal processing device 1000 further includes:

[0292] A second receiving module, configured to receive indication information, where the indication information is used to indicate a modulation parameter of the multi-carrier FTN signal;

[0293] The demodulation module 1002 is specifically used for:

[0294] The multi-carrier FTN signal is demodulated according to the modulation parameters of the multi-carrier FTN signal.

[0295] Optionally, the modulation parameter includes at least one of the following:

[0296] Time domain overlap coefficient;

[0297] Frequency domain overlap coefficient;

[0298] Power allocation parameters for each user or layer;

[0299] MCS for each user or layer;

[0300] The position of the zero padding in the modulation symbols of each user or layer.

[0301] The second signal transmission device 1000 in the embodiments of the present application can be a device, a device or electronic device with an operating system, or a component, integrated circuit, or chip in a terminal. The device or electronic device can be a mobile terminal or a non-mobile terminal. For example, the mobile terminal can include but is not limited to the types of terminals 11 listed above, and the non-mobile terminal can be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), an ATM or a self-service machine, etc., which are not specifically limited in the embodiments of the present application.

[0302] The second signal transmission device 1000 provided in the embodiment of the present application can realize Figure 8 The various processes implemented in the second signal transmission method embodiment shown achieve the same technical effect, and will not be described again here to avoid repetition.

[0303] Optional, such as Figure 11 As shown, the embodiment of the present application also provides a communication device 1100, including a processor 1101, a memory 1102, and a program or instruction stored in the memory 1102 and capable of running on the processor 1101. For example, when the communication device 1100 is a terminal device, the program or instruction is executed by the processor 1101 to implement the various processes of the second signal transmission method embodiment shown in Figure 8 above, and can achieve the same technical effect. When the communication device 1100 is a network side device, the program or instruction is executed by the processor 1101 to implement the above Figure 2 The various processes of the first signal transmission method embodiment shown can achieve the same technical effect. To avoid repetition, they will not be described here.

[0304] The embodiment of the present application also provides a network-side device, including a processor and a communication interface, wherein the processor is used to perform FTN processing on at least two modulation symbol sets respectively, and map the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal; the communication interface is used to send the multi-carrier FTN signal; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers. This network-side device embodiment corresponds to the first signal transmission method embodiment executed by the above-mentioned network-side device, and each implementation process and implementation method of the above-mentioned first signal transmission method embodiment can be applied to this network-side device embodiment and can achieve the same technical effect.

[0305] Specifically, the embodiment of the present application also provides a network side device. Figure 12As shown, network device 1200 includes an antenna 1201, a radio frequency device 1202, and a baseband device 1203. Antenna 1201 is connected to radio frequency device 1202. In the uplink direction, radio frequency device 1202 receives information via antenna 1201 and sends the received information to baseband device 1203 for processing. In the downlink direction, baseband device 1203 processes the information to be transmitted and sends it to radio frequency device 1202. Radio frequency device 1202 processes the received information and then sends it through antenna 1201.

[0306] The frequency band processing device may be located in the baseband device 1203 . The method performed by the network-side device in the above embodiment may be implemented in the baseband device 1203 . The baseband device 1203 includes a processor 1204 and a memory 1205 .

[0307] The baseband device 1203 may include, for example, at least one baseband board on which a plurality of chips are arranged, such as Figure 12 As shown, one of the chips is, for example, a processor 1204, which is connected to a memory 1205 to call a program in the memory 1205 and execute the network device operations shown in the above method embodiment.

[0308] The baseband device 1203 may further include a network interface 1206 for exchanging information with the radio frequency device 1202 . The interface may be, for example, a common public radio interface (CPRI).

[0309] Specifically, the network side device of the embodiment of the present invention further includes: instructions or programs stored in the memory 1205 and executable on the processor 1204, and the processor 1204 calls the instructions or programs in the memory 1205 to execute Figure 9 The methods executed by the modules shown achieve the same technical effects, so they will not be described here to avoid repetition.

[0310] An embodiment of the present application also provides a terminal, including a processor and a communication interface; the communication interface is used to receive a multi-carrier FTN signal carrying at least two modulation symbol sets through multiple subcarriers; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers; the processor is used to demodulate the multi-carrier FTN signal. This terminal embodiment corresponds to the second signal transmission method embodiment executed by the above-mentioned terminal device, and each implementation process and implementation method of the above-mentioned second signal transmission method embodiment can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Figure 13 A schematic diagram of the hardware structure of a terminal device for implementing an embodiment of the present application.

[0311] The terminal device 1300 includes but is not limited to: a radio frequency unit 1301, a network module 1302, an audio output unit 1303, an input unit 1304, a sensor 1305, a display unit 1306, a user input unit 1307, an interface unit 1308, a memory 1309, and at least some of the components of the processor 1310.

[0312] Those skilled in the art will understand that the terminal device 1300 may also include a power supply (such as a battery) to power each component, and the power supply may be logically connected to the processor 1310 through a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system. Figure 13 The structure of the terminal device shown in the figure does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be repeated here.

[0313] It should be understood that in an embodiment of the present application, the input unit 1304 may include a graphics processing unit (GPU) 13041 and a microphone 13042, and the graphics processor 13041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1306 may include a display panel 13061, and the display panel 13061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1307 includes a touch panel 13071 and other input devices 13072. The touch panel 13071 is also called a touch screen. The touch panel 13071 may include two parts: a touch detection device and a touch controller. Other input devices 13072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and an operating stick, which will not be repeated here.

[0314] In this embodiment of the present application, RF unit 1301 receives downlink data from a network-side device and transmits it to processor 1310 for processing. Furthermore, RF unit 1301 transmits uplink data to the network-side device. Typically, RF unit 1301 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0315] The memory 1309 can be used to store software programs or instructions and various data. The memory 1309 may mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area may store an operating system, at least one application program or instruction required for a function (such as a sound playback function, an image playback function, etc.). In addition, the memory 1309 may include a high-speed random access memory and may also include a non-volatile memory, wherein the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. For example, at least one disk storage device, a flash memory device, or other non-volatile solid-state memory device.

[0316] Processor 1310 may include one or more processing units. Optionally, processor 1310 may integrate an application processor and a modem processor. The application processor primarily processes the operating system, user interface, and application programs or instructions, while the modem processor primarily processes wireless communications, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 1310.

[0317] The radio frequency unit 1301 is configured to receive, through multiple subcarriers, a multicarrier FTN signal carrying at least two modulation symbol sets; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers;

[0318] The processor 1310 is configured to demodulate the multi-carrier FTN signal.

[0319] Optionally, the RF unit 1301 receives, through multiple subcarriers, a multicarrier FTN signal carrying at least two modulation symbol sets, including:

[0320] The multi-carrier FTN signal is received in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

[0321] Optionally, the radio frequency unit 1301 is further configured to receive indication information, where the indication information is used to indicate a modulation parameter of the multi-carrier FTN signal;

[0322] The processor 1310 performs the demodulation of the multi-carrier FTN signal, including:

[0323] The multi-carrier FTN signal is demodulated according to the modulation parameters of the multi-carrier FTN signal.

[0324] Optionally, the modulation parameter includes at least one of the following:

[0325] Time domain overlap coefficient;

[0326] Frequency domain overlap coefficient;

[0327] Power allocation parameters for each user or layer;

[0328] MCS for each user or layer;

[0329] The position of the zero padding in the modulation symbols of each user or layer.

[0330] The terminal device 1300 provided in the embodiment of the present application can perform the following Figure 8 In the various steps of the second signal transmission method embodiment shown in the figure, when the network side device flexibly adjusts the multiplexing of the multi-carrier FTN signal in the time domain resources and the frequency domain resources during the baseband signal processing and carrier modulation process, the terminal device 1300 can use the demodulation algorithm in the mature multi-carrier FTN technology to demodulate the multi-carrier FTN signal received from the network side device, thereby improving the reliability of the modulation process and reducing the signaling overhead and computing power overhead of the terminal device 1300, which can achieve the same as Figure 8 The same beneficial effects as those in the method embodiments shown are not described again here to avoid repetition.

[0331] The embodiment of the present application also provides a readable storage medium on which a program or instruction is stored, and when the program or instruction is executed by the processor, the above Figure 2 or Figure 8 The various processes of the method embodiment shown can achieve the same technical effect, and to avoid repetition, they will not be described here.

[0332] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk.

[0333] The embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the above Figure 2 or Figure 8 The various processes of the method embodiment shown can achieve the same technical effect, and to avoid repetition, they will not be described here.

[0334] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0335] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0336] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0337] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A signal transmission method, characterized in that: The method comprises: The transmitting end performs super-Nyquist FTN processing on at least two modulation symbol sets respectively; The transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal; The transmitting end sends the multi-carrier FTN signal; The modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers; the at least two modulation symbol sets include: modulation symbols for at least two user groups, each of which includes at least two users; the at least two modulation symbol sets include K1 groups of first modulation symbol sets, and each group of the first modulation symbol set includes modulation symbols for N1 users, where K1 and N1 are integers greater than 1; The modulation symbols within the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally multiplexed in a non-orthogonal multiple access NOMA manner; or, the modulation symbols within the same group of the first modulation symbol set are non-orthogonally multiplexed in a NOMA manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

2. The method according to claim 1, characterized in that The transmitting end sending the multi-carrier FTN signal includes: The transmitting end transmits the multi-carrier FTN signal in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

3. The method according to claim 1, characterized in that The subcarrier group also includes orthogonal subcarriers.

4. The method according to claim 1, wherein The at least two modulation symbol sets include modulation symbol sets of at least two users, and the modulation symbol set of a same user includes modulation symbols of different layers.

5. The method according to claim 4, characterized in that The at least two modulation symbol sets include K2 groups of second modulation symbol sets, and each group of the second modulation symbol sets includes N2 layer modulation symbols of one user, where K2 and N2 are integers greater than 1.

6. The method according to claim 5, characterized in that: The modulation symbols in the same group of the second modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner; The modulation symbols in different groups of the second modulation symbol sets are non-orthogonally multiplexed in a NOMA manner.

7. The method according to claim 5, characterized in that: The modulation symbols in the same group of the second modulation symbol set are non-orthogonally multiplexed in a NOMA manner; The modulation symbols in different groups of the second modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

8. The method according to claim 1 or 7, characterized in that The modulation symbols in different groups of first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, or the modulation symbols in different groups of second modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, including: The transmission delays of the modulation symbols in different groups of the first modulation symbol set or the second modulation symbol set are different.

9. The method according to claim 1 or 7, characterized in that The modulation symbols in different groups of first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, or the modulation symbols in different groups of second modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner, including: The modulation symbols in different groups of the first modulation symbol sets or the second modulation symbol sets are carried by non-orthogonal subcarriers.

10. The method according to any one of claims 1 to 7, characterized in that Before the transmitting end performs FTN processing on the at least two modulation symbol sets respectively, the method further includes: The transmitting end mixes the first modulation symbol set or the second modulation symbol set in the same group into a target modulation symbol set to obtain K3 target modulation symbol sets, wherein the at least two modulation symbol sets include the K3 target modulation symbol sets, each target modulation symbol set includes L modulation symbols, K3 represents the number of groups of the first modulation symbol set or the second modulation symbol set, and L represents the length of each modulation symbol set in the first modulation symbol set or the second modulation symbol set; The transmitting end performs FTN processing on at least two modulation symbol sets respectively, including: The transmitting end performs FTN non-orthogonal mapping processing on the K3 target modulation symbol sets respectively to obtain K3 FTN symbol sets; The transmitting end maps the processed at least two modulation symbol sets to multiple subcarriers respectively to generate a multi-carrier FTN signal, including: The transmitting end performs multi-carrier modulation processing on the K3 FTN symbol sets to obtain the multi-carrier FTN signal.

11. The method according to claim 10, characterized in that The transmitting end performs multi-carrier modulation processing on the K3 FTN symbol sets, including at least one of the following: The transmitting end maps the K3 FTN symbol sets to K3 subcarriers respectively, wherein the subcarriers occupied by FTN symbols in different FTN symbol sets are non-orthogonal; The transmitting end maps K3 FTN symbol sets to at least two groups of subcarriers, wherein the subcarrier group carrying the FTN signal includes the at least two groups of subcarriers, the subcarriers occupied by the same FTN symbol set are orthogonal, and the subcarriers occupied by different FTN symbol sets are non-orthogonal.

12. The method according to claim 1, characterized in that The method further comprises: The transmitting end sends indication information, where the indication information is used to indicate a modulation parameter of the multi-carrier FTN signal.

13. The method according to claim 12, characterized in that The modulation parameters include at least one of the following: Time domain overlap coefficient; Frequency domain overlap coefficient; Power allocation parameters for each user or layer; Modulation and coding strategy (MCS) for each user or layer; The position of the zero padding in the modulation symbols of each user or layer.

14. A signal transmission method, characterized in that: The method comprises: The receiving end receives, through multiple subcarriers, a multicarrier super-Nyquist FTN signal carrying at least two modulation symbol sets; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers; The receiving end demodulates the multi-carrier FTN signal; The at least two modulation symbol sets include modulation symbols of at least two user groups, each of which includes at least two users; the at least two modulation symbol sets include K1 groups of first modulation symbol sets, each of which includes modulation symbols of N1 users, where K1 and N1 are integers greater than 1; The modulation symbols within the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally multiplexed in a non-orthogonal multiple access NOMA manner; or, the modulation symbols within the same group of the first modulation symbol set are non-orthogonally multiplexed in a NOMA manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

15. The method according to claim 14, characterized in that The receiving end receives, through multiple subcarriers, a multicarrier FTN signal carrying at least two modulation symbol sets, including: The receiving end receives the multi-carrier FTN signal in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

16. The method according to claim 14, characterized in that The method further comprises: The receiving end receives indication information, where the indication information is used to indicate a modulation parameter of the multi-carrier FTN signal; The receiving end demodulating the multi-carrier FTN signal includes: The receiving end demodulates the multi-carrier FTN signal according to the modulation parameters of the multi-carrier FTN signal.

17. The method according to claim 16, characterized in that The modulation parameters include at least one of the following: Time domain overlap coefficient; Frequency domain overlap coefficient; Power allocation parameters for each user or layer; Modulation and coding strategy (MCS) for each user or layer; The position of the zero padding in the modulation symbols of each user or layer.

18. A signal transmission device, characterized in that: include: A first processing module is configured to perform super-Nyquist FTN processing on at least two modulation symbol sets respectively; a mapping module, configured to map the processed at least two modulation symbol sets to a plurality of subcarriers respectively to generate a multicarrier FTN signal; A first sending module, configured to send the multi-carrier FTN signal; The modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the multiple subcarriers include non-orthogonal subcarriers; the at least two modulation symbol sets include: modulation symbols for at least two user groups, each of which includes at least two users; the at least two modulation symbol sets include K1 groups of first modulation symbol sets, and each group of the first modulation symbol set includes modulation symbols for N1 users, where K1 and N1 are integers greater than 1; The modulation symbols within the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally multiplexed in a non-orthogonal multiple access NOMA manner; or, the modulation symbols within the same group of the first modulation symbol set are non-orthogonally multiplexed in a NOMA manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

19. The device according to claim 18, characterized in that The first sending module is specifically configured to: The multi-carrier FTN signal is transmitted in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

20. The device according to claim 18 or 19, characterized in that Also includes: a mixing module, configured to mix the first modulation symbol set or the second modulation symbol set in the same group into a target modulation symbol set, to obtain K3 target modulation symbol sets, wherein the at least two modulation symbol sets include the K3 target modulation symbol sets, each target modulation symbol set includes L modulation symbols, K3 represents the number of groups of the first modulation symbol set or the second modulation symbol set, and L represents the length of each modulation symbol set in the first modulation symbol set or the second modulation symbol set; The processing module is specifically used to: Performing FTN non-orthogonal mapping processing on the K3 target modulation symbol sets respectively to obtain K3 FTN symbol sets; The mapping module is specifically used to: Multi-carrier modulation processing is performed on the K3 FTN symbol sets to obtain the multi-carrier FTN signal.

21. A signal transmission device, characterized in that: include: A first receiving module is configured to receive, through a plurality of subcarriers, a multicarrier super-Nyquist FTN signal carrying at least two modulation symbol sets; wherein the modulation waveforms of the at least two modulation symbol sets partially overlap, and / or the plurality of subcarriers include non-orthogonal subcarriers; A demodulation module, configured to demodulate the multi-carrier FTN signal; The at least two modulation symbol sets include modulation symbols of at least two user groups, each of which includes at least two users; the at least two modulation symbol sets include K1 groups of first modulation symbol sets, each of which includes modulation symbols of N1 users, where K1 and N1 are integers greater than 1; The modulation symbols within the same group of the first modulation symbol set are non-orthogonally mapped in a multi-carrier FTN manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally multiplexed in a non-orthogonal multiple access NOMA manner; or, the modulation symbols within the same group of the first modulation symbol set are non-orthogonally multiplexed in a NOMA manner, and the modulation symbols within different groups of the first modulation symbol sets are non-orthogonally mapped in a multi-carrier FTN manner.

22. The device according to claim 21, characterized in that The first receiving module is specifically configured to: The multi-carrier FTN signal is received in at least one of non-orthogonal time domain resources and non-orthogonal frequency domain resources.

23. The device according to claim 21, characterized in that Also includes: A second receiving module, configured to receive indication information, where the indication information is used to indicate a modulation parameter of the multi-carrier FTN signal; The demodulation module is specifically used to: The multi-carrier FTN signal is demodulated according to the modulation parameters of the multi-carrier FTN signal.

24. A network side device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the signal transmission method according to any one of claims 1 to 13.

25. A terminal device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the signal transmission method according to any one of claims 14 to 17.

26. A readable storage medium, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the signal transmission method according to any one of claims 1 to 13 are implemented, or the steps of the signal transmission method according to any one of claims 14 to 17 are implemented.

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