Signal transmission method, device and system

Abstract

The invention discloses a signal transmission method, device and system, and belongs to the technical field of communication. The method comprises the following steps that: a sending node carries out overall frequency shift on a plurality of subcarriers by a target frequency band width, then carries out frequency spectrum rearrangement on a first frequency band and a second frequency band which are obtained by splitting the target subcarriers and are arranged along the frequency shift direction, and finally sends corresponding to-be-transmitted signals on the plurality of subcarriers respectively. The plurality of subcarriers are in one-to-one correspondence with the plurality of to-be-transmitted signals; the target frequency band width is smaller than the frequency band width of the target subcarrier, and the target subcarrier is an edge subcarrier arranged in the frequency shift direction in the multiple subcarriers; and after the frequency spectrum is rearranged, the first frequency band, other subcarriers except the target subcarrier in the plurality of subcarriers and the second frequency band are arranged along the frequency shift direction. The problem that effective transmission of the signals is affected due to damage of the signals borne on the two edge subcarriers can be solved, and the method and the device are applied to a signal transmission system.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and particularly to a signal transmission method, apparatus, and system. Background Art

[0002] In the field of communication technologies, a transmitting node can transmit multiple signals one-to-one on multiple subcarriers, and multiple receiving nodes can respectively receive the signals corresponding to the subcarriers on the multiple subcarriers.

[0003] Generally, the signal transmission link between a transmitting node and multiple receiving nodes usually has a frequency band width limitation. Therefore, the signals carried on multiple subcarriers are usually filtered on this signal transmission link.

[0004] After the signals carried on multiple subcarriers are filtered, usually a part of the signals carried on the two edge subcarriers among the multiple subcarriers will be filtered out, which will cause damage to the signals carried on these two edge subcarriers and affect the effective transmission of the signals carried on the multiple subcarriers. Summary of the Invention

[0005] This application provides a signal transmission method, apparatus, and system, which can solve the problem that the signals carried on the two edge subcarriers are damaged and affect the effective transmission of the signals.

[0006] In a first aspect, this application provides a signal transmission method, which is executed by a transmitting node. The method includes: the transmitting node first frequency-shifts the multiple subcarriers as a whole by a target frequency band width, then performs spectrum rearrangement on the first frequency band and the second frequency band obtained by splitting the target subcarriers and arranged along the direction of the frequency shift respectively, and finally transmits the corresponding signals to be transmitted on the multiple subcarriers respectively.

[0007] Wherein, the multiple subcarriers correspond to multiple signals to be transmitted one-to-one, and the signals to be transmitted are carried on the corresponding subcarriers; the target frequency band width is less than the frequency band width of the target subcarriers, and the target subcarriers are the edge subcarriers arranged in the direction of the frequency shift among the multiple subcarriers; wherein, after the spectrum rearrangement, the first frequency band, the other subcarriers among the multiple subcarriers except the target subcarriers, and the second frequency band are arranged along the direction of the frequency shift;

[0008] The embodiments of the present application do not limit the direction of frequency shift. For example, the direction of frequency shift can be the direction of increasing frequency or the direction of decreasing frequency. When the direction of frequency shift is the direction of increasing frequency, after the overall frequency shift of multiple subcarriers by the target frequency band width, the center frequency of each subcarrier increases by the target frequency band width. When the direction of frequency shift is the direction of decreasing frequency, after the overall frequency shift of multiple subcarriers by the target frequency band width, the center frequency of each subcarrier decreases by the target frequency band width.

[0009] Since in the signal transmission method provided by the embodiments of the present application, the overall frequency shift of multiple subcarriers and the spectrum rearrangement of the first frequency band and the second frequency band of the target subcarriers among multiple subcarriers can be performed, in this way, the influence of filtering on other subcarriers among multiple subcarriers can be reduced, the probability that only part of the signals carried on one subcarrier among multiple subcarriers are filtered can be increased, and the number of subcarriers carrying damaged signals can be reduced. Moreover, the target subcarrier is split into the first frequency band and the second frequency band, and the probability that these two frequency bands are filtered simultaneously is relatively high. Therefore, the target subcarrier does not belong to the case of unilateral filtering. At this time, the signals carried on the target subcarrier are relatively easy to recover.

[0010] The target frequency band width of the overall frequency shift of multiple subcarriers can be any value greater than zero and less than the frequency band width of the target subcarrier.

[0011] In one implementable manner, the target frequency band width is half of the frequency band width of the target subcarrier.

[0012] In another implementable manner, the center frequencies of the multiple subcarriers are offset relative to the center frequency of the sending node; the target frequency band width is determined based on the frequency band width of the target subcarrier and / or the offset parameter. Assuming that the center frequencies of the multiple subcarriers are offset by a reference frequency band relative to the center frequency of the sending node, then the offset parameter includes: the direction of the offset and / or the frequency band width of the reference frequency band. In this way, the influence brought by the offset can be at least partially offset by the frequency shift of the target frequency band width.

[0013] Exemplarily, when the direction of the offset is the same as the direction of the frequency shift, the target frequency band width is the difference between half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band. When the direction of the offset is opposite to the direction of the frequency shift, the target frequency band width is the sum of half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band.

[0014] Optionally, the frequency band width of the first frequency band is equal to the target frequency band width. It can be seen that after the above processing of frequency shift and spectrum relocation, the frequency band occupied by multiple subcarriers together does not change. Of course, the frequency band width of the first frequency band can also be not equal to the target frequency band width.

[0015] In a second aspect, the present application provides a signal transmission method, which is executed by a receiving node. The method includes: after determining the subcarrier corresponding to the receiving node among multiple subcarriers, the receiving node receives a signal to be transmitted on the subcarrier corresponding to the receiving node. Among them, the multiple subcarriers correspond to multiple signals to be transmitted one by one, and the signal to be transmitted is carried on the corresponding subcarrier; the target subcarrier among the multiple subcarriers includes a first frequency band and a second frequency band, and the other subcarriers among the multiple subcarriers except the target subcarrier are arranged between the first frequency band and the second frequency band.

[0016] In a third aspect, the present application provides a signal transmission device, which belongs to a transmitting node. The signal transmission device includes: a frequency shift module, a rearrangement module, and a transmission module. The frequency shift module is used to shift the multiple subcarriers as a whole by a target frequency band width; the multiple subcarriers correspond to multiple signals to be transmitted one by one, and the signal to be transmitted is carried on the corresponding subcarrier; the target frequency band width is less than the frequency band width of the target subcarrier, and the target subcarrier is the edge subcarrier among the multiple subcarriers arranged in the frequency shift direction; the rearrangement module is used to perform spectrum rearrangement on the first frequency band and the second frequency band obtained by splitting the target subcarrier and arranged in the frequency shift direction respectively; among them, after the spectrum rearrangement, the second frequency band, the other subcarriers among the multiple subcarriers except the target subcarrier, and the first frequency band are arranged in the frequency shift direction; the transmission module is used to transmit the corresponding signal to be transmitted on the multiple subcarriers respectively.

[0017] Optionally, the center frequencies of the multiple subcarriers are offset relative to the center frequency of the transmitting node; the target frequency band width is determined based on the frequency band width of the target subcarrier and / or the offset parameter. By way of example, assume that the center frequencies of the multiple subcarriers are offset from the center frequency of the transmitting node by a reference frequency band; the offset parameter includes: the direction of the offset and / or the frequency band width of the reference frequency band.

[0018] Optionally, when the direction of the offset is the same as the direction of the frequency shift, the target frequency band width is the difference between half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band. When the direction of the offset is opposite to the direction of the frequency shift, the target frequency band width is the sum of half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band.

[0019] The embodiments of the present application can also be applicable to the case where the center frequencies of the multiple subcarriers are not offset relative to the center frequency of the transmitting node.

[0020] In addition, regardless of whether the center frequencies of multiple subcarriers are offset relative to the center frequency of the sending node, the target frequency band width can be half of the frequency band width of the target subcarrier.

[0021] Optionally, the frequency band width of the first frequency band is equal to the target frequency band width. Of course, the frequency band width of the first frequency band may also not be equal to the target frequency band width.

[0022] In a fourth aspect, the present application provides a signal transmission device, which belongs to a receiving node. The signal transmission device includes: a determination module and a receiving module. The determination module is configured to determine the subcarrier corresponding to the receiving node among multiple subcarriers; the multiple subcarriers correspond to multiple signals to be transmitted one by one, and the signals to be transmitted are carried on the corresponding subcarriers; the target subcarrier among the multiple subcarriers includes a first frequency band and a second frequency band, and the other subcarriers among the multiple subcarriers except the target subcarrier are arranged between the first frequency band and the second frequency band; the receiving module is configured to receive the signal to be transmitted on the subcarrier corresponding to the receiving node.

[0023] In a fifth aspect, the present application provides a signal transmission system, including: a sending node and multiple receiving nodes; the sending node includes the signal transmission device designed in any one of the third aspects, and the receiving node includes the signal transmission device designed in any one of the fourth aspects.

[0024] In a sixth aspect, the present application provides a chip, which includes a programmable logic circuit and / or program instructions, and is configured to implement the signal transmission method designed in any one of the first aspect or the second aspect when the chip runs.

[0025] In a seventh aspect, the present application provides a computer-readable storage medium, in which instructions are stored, and when the instructions run on a computer, the computer is caused to execute the signal transmission method designed in any one of the first aspect or the second aspect. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of a signal transmission system provided by an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of the process of a sending node sending a signal provided by an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of multiple subcarriers provided by an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the multiplexing result of multiple subcarriers provided by an embodiment of the present application;

[0030] Figure 5 Schematic diagram of the process of a receiving node receiving a signal provided by an embodiment of the present application;

[0031] Figure 6 Schematic diagram of a filtering provided by an embodiment of the present application;

[0032] Figure 7 Another schematic diagram of a filtering provided by an embodiment of the present application;

[0033] Figure 8 Flowchart of a signal transmission method provided by an embodiment of the present application;

[0034] Figure 9 Schematic diagram of multiple sub - carriers after frequency shift provided by an embodiment of the present application;

[0035] Figure 10 Schematic diagram of the first frequency band and the second frequency band in a target sub - carrier provided by an embodiment of the present application;

[0036] Figure 11 Schematic diagram after spectral rearrangement of the first frequency band and the second frequency band provided by an embodiment of the present application;

[0037] Figure 12 Schematic diagram of the relationship between multiple sub - carriers after frequency shift and trapezoid X provided by an embodiment of the present application;

[0038] Figure 13 Schematic diagram of the relationship between multiple sub - carriers after spectral rearrangement and trapezoid X provided by an embodiment of the present application;

[0039] Figure 14 Schematic diagram of a signal transmission device provided by an embodiment of the present application;

[0040] Figure 15 Another schematic diagram of a signal transmission device provided by an embodiment of the present application. Detailed implementation manners

[0041] An embodiment of the present application provides a signal transmission system, and this signal transmission system is a coherent optical transmission system. As Figure 1 shown, this signal transmission system includes a sending node 01 and multiple receiving nodes 02. The sending node 01 and the multiple receiving nodes 02 can be connected through an optical fiber 03, and the sending node 01 can send signals to the multiple receiving nodes 02. Both the sending node 01 and the receiving nodes 02 are communication nodes. A communication node can be a communication device such as a router, a gateway, a computer, etc., or a communication node can also be a part of a communication device. For example, the sending node 01 is a transmitter in a communication device, and the receiving node 02 is a receiver in a communication device.

[0042] When a transmitting node sends signals to multiple receiving nodes, it can first obtain the bit sequences that the signals to be sent to each receiving node need to carry; then, as Figure 2 shown, the transmitting node can perform waveforming processing on each bit sequence respectively to carry the corresponding bit sequence on multiple subcarriers. Here, the subcarriers are also called digital subcarriers. Among them, the waveforming processing performed on a bit sequence includes: performing forward error correction (FEC) encoding on the bit sequence; performing symbol mapping on the bit sequence after FEC encoding to obtain a symbol sequence; performing a fast Fourier transform (FFT) on the symbol sequence to transform the symbol sequence from the time domain to the frequency domain so as to carry the bit sequence on the corresponding subcarrier; finally, performing pulse shaping (spectrum shaping) on the subcarrier to facilitate the transmission of the symbol sequence carried on the subcarrier.

[0043] After pulse shaping, the transmitting node can multiplex these subcarriers to continuously arrange these subcarriers on the frequency axis to achieve frequency division multiplexing of these subcarriers. The signal obtained by multiplexing can be called a digital multi-band carrier (DMB) signal. Exemplarily, as Figure 3 shown, assuming that multiple subcarriers include subcarriers 1 to 8, after multiplexing these subcarriers, a multi-carrier as shown in Figure 4 can be obtained. In this multi-carrier, subcarriers 1 to 8 are arranged in sequence on the frequency axis. Exemplarily, before multiplexing, the i-th subcarrier can be represented by X i (f), where f represents frequency and the center frequency of the subcarrier before multiplexing is 0. Then, the DMB signal obtained after multiplexing subcarriers 1 to 8 is represented as: k i represents the center frequency of the i-th subcarrier in the DMB signal.

[0044] After multiplexing multiple subcarriers, as Figure 2 shown, the signal obtained by multiplexing can be pre-compensated, inverse fast Fourier transform (IFFT) and digital-to-analog conversion (DAC) in sequence. Among them, pre-compensation is used to pre-compensate for the distortion of the signal in subsequent transmission to reduce the distortion. IFFT is used to transform the signal from the frequency domain to the time domain. DAC is used to convert the signal converted to the time domain from a digital signal to an analog signal. Finally, the transmitting node can perform electro-optic conversion on the analog signal to obtain an optical signal and transmit the optical signal to the optical fiber. The optical signal can have at least one wavelength, and the optical signal can be transmitted in one or more optical fibers.

[0045] It is understandable that the transmitting node may also not perform the above-mentioned pulse shaping. Instead, after carrying the symbol sequence on the corresponding subcarriers, the subcarriers are multiplexed. The transmitting node may also not perform the above-mentioned pre-compensation. Instead, after multiplexing multiple subcarriers, IFFT is performed on these subcarriers.

[0046] The operations performed by the receiving node are inverse to those performed by the transmitting node. Exemplarily, when the receiving node receives the signal transmitted by the transmitting node, as Figure 5 shown, it can first perform optoelectronic conversion on the signal received from the optical fiber to obtain an analog signal. Then, analog-to-digital conversion (ADC) and FFT are sequentially performed on the analog signal. Among them, ADC is used to convert the analog signal into a digital signal, and FFT is used to convert the digital signal from the time domain to the frequency domain.

[0047] After converting the digital signal to the frequency domain, the receiving node can demultiplex the signal in the frequency domain to extract the signal carried on the subcarriers corresponding to the receiving node (this process can also be called frequency-domain demultiplexing). For example, assuming that the subcarrier corresponding to the receiving node is Figure 4 subcarrier 1 in, then the receiving node can extract the signal carried on subcarrier 1 according to the frequency band of subcarrier 1 during the demultiplexing process.

[0048] After that, the receiving node can sequentially perform equalization processing, IFFT, carrier phase recovery, symbol demapping, and FEC decoding on the signal carried on the corresponding subcarriers to obtain the bit sequence that the transmitting node needs to send to the receiving node. Among them, equalization processing is used to compensate for the impairments brought by the link in the signal, such as the impairments brought by chromatic dispersion and polarization mode dispersion (PMD) of the link. Carrier phase recovery is used to compensate for the impairments brought by the laser in the optical transmitter to the signal (such as frequency offset, phase noise, etc.). Symbol demapping is used to demap the symbol sequence into the bit sequence after FEC coding; FEC decoding is used to decode the bit sequence after FEC coding to obtain the bit sequence that the transmitting node sends to the receiving node.

[0049] Among the operations to be performed by the above-mentioned transmitting node, the part other than optoelectronic conversion can be performed by a digital signal process (DSP) chip in the transmitting node. This DSP chip can belong to the electrical transmitter in the transmitting node. Optoelectronic conversion can be performed by the optical transmitter in the transmitting node. Optionally, the transmitting node may not include an optical transmitter. For example, the transmitting node only includes this DSP chip, and the embodiments of the present application do not make any limitations in this regard.

[0050] Among the operations to be performed by the above-mentioned receiving node, the part other than photoelectric conversion can be performed by the DSP chip in the receiving node. This DSP chip can belong to the electrical receiver in the receiving node. Photoelectric conversion can be performed by the optical receiver in the receiving node. Optionally, the receiving node may not include an optical receiver. For example, the receiving node only includes this DSP chip, and the embodiments of the present application do not limit this.

[0051] With the continuous development of communication technologies, the emergence of various emerging services has continuously increased the network capacity requirements. A huge transmission capacity needs to be efficiently and reliably transmitted to ensure the normal operation of services. For example, the transmission rate of a single optical carrier has gradually evolved rapidly from 100 gigabits per second (Gbps) to 200 Gbps, 400 Gbps, 800 Gbps, or even above 1.6 Tbps (1 Tbps = 1000 Gbps). Ensuring the high-speed and reliable transmission of services in optical fibers is the basis for the normal operation of the entire signal transmission system.

[0052] However, the signal transmission link between the sending node and multiple receiving nodes usually has a bandwidth limitation. Therefore, the signals carried on multiple subcarriers are usually filtered on this signal transmission link. For example, the bandwidth of the transmission link depends on the bandwidth of the devices on the link, such as wavelength selective switches (WSS), electrical transmitters, optical transmitters, electrical receivers, optical receivers, etc. provided on the optical fiber. When the signal passes through each device on the link, the device will filter the signal. The part of the signal bandwidth that exceeds the bandwidth of the device will be filtered out by the device.

[0053] After the signals carried on multiple subcarriers are filtered, usually part of the signals carried on the two edge subcarriers among the multiple subcarriers will be filtered out, which will cause damage to the signals carried on these two edge subcarriers and affect the effective transmission of the signals. If a part of the signal is filtered out in the link, it will introduce inter-symbol interference to the signal, and in severe cases, it will cause pre-correction degradation and affect the recovery of the signal.

[0054] As Figure 6 shown, assuming that multiple subcarriers include subcarriers 1 to 8, when the signals carried on subcarriers 1 and 8 are filtered on the link, the signals carried on the part of subcarriers 1 to 8 located within trapezoid X are not filtered out, while the signals carried on the part of subcarriers 1 to 8 located outside trapezoid X are filtered out. It can be seen that the signals carried on subcarriers 2 to 7 are not filtered out, while part of the signals carried on subcarriers 1 and 8 are filtered out. In this way, the signals carried on subcarriers 1 and 8 cannot be effectively transmitted to the corresponding receiving nodes.

[0055] Moreover, according to Figure 6 it can be seen that the part of sub - carrier 1 outside trapezoid X is not approximately symmetrically distributed about the center frequency of sub - carrier 1, and the part of sub - carrier 8 outside trapezoid X is not approximately symmetrically distributed about the center frequency of sub - carrier 8. It can be seen that both sub - carriers 1 and 8 belong to the case of unilateral filtering. In this case, the inter - symbol interference introduced by unilateral filtering is difficult to compensate, so the difficulty of signal recovery is relatively high.

[0056] Furthermore, due to the non - ideal characteristics of the devices on the link, there is a frequency offset in the devices. At this time, there is a deviation in the frequency band width of the devices, which will lead to non - uniform filtering and further deterioration of signal quality. For example, when there is a frequency offset, as Figure 7 shown. Figure 6 The trapezoid X in Figure 7 will shift on the frequency axis (taking left - hand shift as an example in

[0057] In this case, there are still parts of sub - carriers 1 and 8 outside trapezoid X, but the part of sub - carrier 1 outside trapezoid X increases, while the part of sub - carrier 8 outside trapezoid X decreases; the signals filtered out in the signals carried on sub - carrier 1 increase, while the signals filtered out in the signals carried on sub - carrier 8 decrease. The transmission quality of the signals carried on sub - carrier 1 is further reduced, and the difficulty of recovering this signal is further increased.

[0058] In addition, when the frequency band widths of multiple sub - carriers are small and multiple sub - carriers are all within the frequency band width of the link, if there is a frequency offset in the device, it may also cause some sub - carriers to be outside the frequency band width of the link, so that some signals carried by these sub - carriers will still be filtered out.

[0059] It can be seen that the above - mentioned filtering and frequency offset may both cause some signals carried by some sub - carriers to be filtered out, affecting the effective transmission of the signals carried on this sub - carrier.

[0060] An embodiment of the present application provides a signal transmission method. By performing frequency shift and rearrangement on subcarriers, only a part of the signals carried on one subcarrier among multiple subcarriers can be filtered, reducing the number of subcarriers carrying the filtered signals. Moreover, this "one subcarrier" in the embodiment of the present application does not belong to the case of unilateral filtering. Therefore, the inter-symbol interference introduced by filtering is relatively easy to compensate, and the signals carried on this subcarrier are relatively easy to recover. Also, this signal transmission method does not change the signal transmission rate. Therefore, a series of problems caused by the reduction of the signal transmission rate will not occur.

[0061] Exemplarily, Figure 8 is a flowchart of a signal transmission method provided by an embodiment of the present application. As Figure 8 shown, this signal transmission method includes:

[0062] S101. The sending node frequency-shifts the multiple subcarriers by the target frequency band width as a whole; the multiple subcarriers correspond to multiple signals to be transmitted one by one, and the signals to be transmitted are carried on the corresponding subcarriers; the target frequency band width is less than the frequency band width of the target subcarrier, and the target subcarrier is the edge subcarrier among the multiple subcarriers arranged in the frequency-shift direction.

[0063] Before S101, the sending node may first refer to the operations of obtaining the bit sequence, FEC encoding, symbol mapping, FFT, pulse shaping (pulse shaping is optional), and multiplexing performed by the sending node in the foregoing embodiments to obtain multiple signals to be transmitted carried on the multiple subcarriers one by one (these signals can be referred to as DMB signals).

[0064] After obtaining the multiple signals to be transmitted carried on the multiple subcarriers one by one, the sending node can then adjust the multiple subcarriers by using the method provided by the embodiment of the present application. Exemplarily, in S101, the sending node can frequency-shift the multiple subcarriers by the target frequency band width as a whole. The embodiment of the present application does not limit the direction of frequency shift. For example, the direction of frequency shift can be the direction of increasing frequency or the direction of decreasing frequency. When the direction of frequency shift is the direction of increasing frequency, after frequency-shifting the multiple subcarriers by the target frequency band width as a whole, the center frequency of each subcarrier increases by the target frequency band width. When the direction of frequency shift is the direction of decreasing frequency, after frequency-shifting the multiple subcarriers by the target frequency band width as a whole, the center frequency of each subcarrier decreases by the target frequency band width.

[0065] Before the overall frequency shift of multiple subcarriers, there are two subcarriers among the multiple subcarriers that are edge subcarriers, and these two subcarriers are the two edge subcarriers. The center frequencies of the edge subcarriers are the maximum and minimum values among the center frequencies of the multiple subcarriers. For example, among these two edge subcarriers, the center frequency of one edge subcarrier is the minimum value among the center frequencies of the multiple subcarriers, and the center frequency of the other edge subcarrier is the maximum value among the center frequencies of the multiple subcarriers.

[0066] The direction of the overall frequency shift of the multiple subcarriers can be towards the direction where any one of the two edge subcarriers is located. In the embodiments of the present application, this any one edge subcarrier is referred to as the target subcarrier. It can be seen that the target subcarrier among the multiple subcarriers is the edge subcarrier arranged in the direction of the frequency shift. Exemplarily, when the direction of the frequency shift is the direction of increasing frequency, before or after the overall frequency shift of the multiple subcarriers, the center frequency of the target subcarrier is the maximum value among the center frequencies of the multiple subcarriers. When the direction of the frequency shift is the direction of decreasing frequency, before or after the overall frequency shift of the multiple subcarriers, the center frequency of the target subcarrier is the minimum value among the center frequencies of the multiple subcarriers.

[0067] The target frequency band width of the overall frequency shift of the multiple subcarriers can be any value greater than zero and less than the frequency band width of the target subcarrier. In the embodiments of the present application, an example is given where the target frequency band width is half of the frequency band width of the target subcarrier.

[0068] Exemplarily, assuming that the target frequency band width is half of the frequency band width of the target subcarrier, and the direction of the frequency shift is the direction of decreasing frequency, then Figure 4 after the overall frequency shift of the multiple subcarriers shown by the target frequency band width, the multiple subcarriers can be as shown in Figure 9 shown.

[0069] It can be understood that before the overall frequency shift, the multiple subcarriers are arranged in sequence on the frequency axis. Optionally, there is a guard frequency band width between adjacent subcarriers, or adjacent subcarriers are continuous (without any frequency band width in between), or adjacent subcarriers overlap; after the overall frequency shift, the multiple subcarriers are still arranged in sequence on the frequency axis, and the relationship between adjacent subcarriers remains unchanged. It can be seen that the overall frequency shift of the multiple subcarriers does not change the magnitude relationship of the center frequencies of the multiple subcarriers, nor does it change the relationship between adjacent subcarriers.

[0070] S102. The sending node respectively performs spectrum rearrangement on the first frequency band and the second frequency band obtained by splitting the target subcarrier and arranged in the direction of the frequency shift; wherein, after the spectrum rearrangement, the first frequency band, the other subcarriers among the multiple subcarriers except the target subcarrier, and the second frequency band are arranged in the direction of the frequency shift.

[0071] In S102, the transmitting node can first determine the first frequency band and the second frequency band obtained by splitting the target subcarrier. Among them, the first frequency band and the second frequency band are arranged along the direction of frequency shift in S101. Exemplarily, when the direction of frequency shift is the direction of increasing frequency, the first frequency band is the frequency band with a smaller frequency in the target subcarrier, and the second frequency band is the frequency band with a larger frequency in the target subcarrier; when the direction of frequency shift is the direction of increasing frequency, the first frequency band is the frequency band with a smaller frequency in the target subcarrier, and the second frequency band is the frequency band with a larger frequency in the target subcarrier.

[0072] Assume that the signal (symbol sequence) carried by the target subcarrier includes N symbols. Then, the symbol sequence carried by the first frequency band of the target subcarrier can be expressed as: the product of the N symbols and the first matrix; the symbol sequence carried by the second frequency band of the target subcarrier can be expressed as: the product of the N symbols and the second matrix.

[0073] Among them, the first matrix is: The first matrix includes elements with N rows and N columns. The element in the j-th row and j-th column among the first Q rows and Q columns of the first matrix is 1, where 1 ≤ j ≤ Q, and the elements other than the element in the j-th row and j-th column in the first Q rows and Q columns are all 0. The elements other than the first Q rows and Q columns in the first matrix are all 0.

[0074] The second matrix is: The second matrix includes elements with N rows and N columns. The element in the h-th row and h-th column among the last P rows and P columns of the second matrix is 1, where 1 ≤ h ≤ P, and the elements other than the element in the h-th row and h-th column in the last P rows and P columns are all 0. The elements other than the first P rows and P columns in the second matrix are all 0. P + Q = N.

[0075] After determining the first frequency band and the second frequency band in the target subcarrier, the transmitting node can perform spectrum rearrangement on the first frequency band and the second frequency band. After spectrum rearrangement, the first frequency band, other subcarriers among the multiple subcarriers except the target subcarrier, and the second frequency band are arranged along the direction of frequency shift.

[0076] Optionally, the relationship between the first frequency band and the adjacent subcarriers among the other subcarriers, and the relationship between the second frequency band and the adjacent subcarriers among the other subcarriers can be the same as the relationship between adjacent subcarriers in S101. For example, assume that the adjacent subcarriers in S101 are separated by the width of the guard band. Then, the first frequency band is also separated from the adjacent subcarriers among the other subcarriers by the width of the guard band, and the second frequency band is separated from the adjacent subcarriers among the other subcarriers by the width of the guard band.

[0077] Exemplarily, assume Figure 9 the first frequency band and the second frequency band in the target subcarrier among the multiple subcarriers shown in Figure 10As shown, after the spectrum rearrangement of the first frequency band and the second frequency band, the first frequency band, the other subcarriers, and the second frequency band can be arranged in accordance with Figure 11 arrangement.

[0078] Optionally, the bandwidth of the first frequency band is equal to the above-mentioned target bandwidth (at this time, P = Q = N / 2). In this way, after the spectrum rearrangement of the first frequency band and the second frequency band, the frequency band jointly occupied by the first frequency band, the other subcarriers, and the second frequency band is the same as the frequency band jointly occupied by the multiple subcarriers in S101. It can be seen that after the processing of S101 and S102 above, the frequency band jointly occupied by the multiple subcarriers does not change. However, the frequency band occupied by each of the other subcarriers moves the target bandwidth in the direction of the above-mentioned frequency shift, and the frequency band of the first subcarrier becomes the first frequency band and the second frequency band after spectrum relocation. The bandwidth of the first frequency band may also not be equal to the above-mentioned target bandwidth, and the embodiments of the present application do not limit this.

[0079] In addition, when the bandwidth of the first frequency band is equal to the target bandwidth and the target bandwidth is half of the bandwidth of the target subcarrier, the bandwidths of both the first frequency band and the second frequency band are half of the bandwidth of the target subcarrier. At this time, the bandwidth of the first frequency band is equal to the bandwidth of the second frequency band.

[0080] S103. The sending node respectively sends the corresponding signals to be transmitted on multiple subcarriers.

[0081] In S101 and S102 above, the embodiments of the present application perform frequency shift and rearrangement on the multiple subcarriers, but the corresponding relationship between these subcarriers and the signals to be transmitted does not change. For example, after S101 and S102, although the other subcarriers are frequency-shifted by the target bandwidth, the signals to be transmitted corresponding to the other subcarriers do not change. After S101 and S102, although the first subcarrier becomes the first frequency band and the second frequency band after spectrum relocation, the signal to be transmitted corresponding to the first subcarrier does not change. It can be seen that S101 and S102 are used to update the subcarriers corresponding to each signal to be transmitted. In S103, the sending node can send the signal to be transmitted on the subcarrier corresponding to each signal to be transmitted.

[0082] The operation of the sending node in S103 can refer to the operation after multiplexing in the foregoing Figure 2 , and the embodiments of the present application will not elaborate here.

[0083] S104. The receiving node determines the subcarriers corresponding to the receiving node among the multiple subcarriers.

[0084] In an embodiment of the present application, multiple subcarriers correspond to multiple receiving nodes one by one. Each receiving node can determine the corresponding subcarrier, and then receive signals on this subcarrier in subsequent operations.

[0085] Exemplarily, information about the subcarrier corresponding to each receiving node can be pre-configured in each receiving node, or the receiving node can receive information about the subcarrier corresponding to this receiving node sent by other nodes. The receiving node can determine the corresponding subcarrier according to the information about the corresponding subcarrier. The other nodes here can be the sending node, other receiving nodes, or nodes other than the sending node and the multiple receiving nodes. The embodiments of the present application do not limit this.

[0086] The subcarriers corresponding to the multiple receiving nodes are the multiple subcarriers in S103 above. Exemplarily, the multiple subcarriers in S103 correspond to multiple signals to be transmitted one by one, and the signals to be transmitted are carried on the corresponding subcarriers; the target subcarrier among the multiple subcarriers includes a first frequency band and a second frequency band, and the other subcarriers among the multiple subcarriers except the target subcarrier are arranged between the first frequency band and the second frequency band.

[0087] It can be seen that for each receiving node, the subcarrier corresponding to this receiving node is updated after S101 and S102. In S103, the sending node sends signals to this receiving node on the updated subcarrier. In S104, this receiving node needs to determine the updated subcarrier so that this receiving node can receive the signals sent by the sending node on the updated subcarrier in subsequent operations.

[0088] Taking the target receiving node among the multiple receiving nodes corresponding to the target subcarrier among the multiple subcarriers as an example, the information about the subcarrier corresponding to the target receiving node includes: information about the first frequency band and the second frequency band in the target subcarrier. The first frequency band, the subcarriers corresponding to other receiving nodes except the first receiving node, and the second frequency band are arranged in sequence. The target receiving node needs to determine the first frequency band according to the information about the first frequency band and determine the second frequency band according to the information about the second frequency band. In this way, the target receiving node can determine the target subcarrier according to the determined first frequency band and second frequency band.

[0089] S105. The receiving node receives the signal to be transmitted sent by the sending node on the corresponding subcarrier.

[0090] The process of the receiving node receiving signals on the corresponding subcarrier can refer to the process Figure 5 shown above. The embodiments of the present application will not elaborate here.

[0091] In summary, in the signal transmission method provided by the embodiments of the present application, by performing an overall frequency shift on multiple subcarriers and performing spectral rearrangement on the first frequency band and the second frequency band of the target subcarrier among the multiple subcarriers, the influence of filtering on other subcarriers among the multiple subcarriers can be reduced, the probability that only part of the signals carried on one subcarrier among the multiple subcarriers are filtered can be increased, and the number of subcarriers carrying damaged signals can be reduced. Moreover, the target subcarrier is split into a first frequency band and a second frequency band, and the probability that these two frequency bands are filtered simultaneously is relatively high. Therefore, the target subcarrier does not belong to the case of unilateral filtering. At this time, the signals carried on the target subcarrier are relatively easy to recover.

[0092] Exemplarily, taking Figure 7 the multiple subcarriers and trapezoid X shown as an example, the sending node in the embodiments of the present application can perform an overall frequency shift on Figure 7 subcarriers 1 to 8 in, and the relationship between the frequency-shifted multiple subcarriers and trapezoid X can be as Figure 12 shown. After that, the sending node can perform spectral rearrangement on the first frequency band and the second frequency band in subcarrier 1 (the target subcarrier) in S102, and the relationship between the multiple subcarriers and trapezoid X after spectral rearrangement can be as Figure 13 shown.

[0093] According to Figure 13 it can be known that when the signals carried on subcarriers 1 and 8 are filtered under the action of the link bandwidth and frequency offset, the signals carried on subcarriers 2 to 8 are not filtered out, while part of the signals carried on subcarrier 1 are filtered out. In this way, the signals carried on subcarriers 2 to 8 can all be effectively transmitted to the corresponding receiving nodes. Moreover, since subcarrier 1 is split into a first frequency band and a second frequency band, and part of the signals in both the first frequency band and the second frequency band are filtered out, the parts of subcarrier 1 outside trapezoid X are approximately symmetrically distributed. It can be seen that subcarrier 1 is not in the case of unilateral filtering. In this case, the inter-symbol interference introduced by filtering is relatively easy to compensate, so the difficulty of recovering the signals carried on subcarrier 1 is relatively low.

[0094] In the above embodiments, the target frequency band width is taken as half of the frequency band width of the target subcarrier as an example. Optionally, the target frequency band width may not be half of the frequency band width of the target subcarrier. For example, when the center frequencies of the multiple subcarriers are offset relative to the center frequency of the sending node, the target frequency band width is determined based on the frequency band width of the target subcarrier and / or the offset parameters. The target frequency band width determined in this way may be half of the frequency band width of the target subcarrier, or may not be half of the frequency band width of the target subcarrier.

[0095] The offset parameter is used to reflect the offset situation, and there are various implementation methods for the offset parameter. Exemplarily, when the center frequencies of multiple subcarriers are offset from the center frequency of the sending node by a reference frequency band, the above-mentioned offset parameter includes: the offset direction and / or the frequency band width of the reference frequency band.

[0096] For example, when the offset direction is the same as the frequency shift direction, the target frequency band width is the difference between half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band. When the offset direction is opposite to the frequency shift direction, the target frequency band width is the sum of half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band. In this way, the influence brought by the offset can be offset by the frequency shift of the target frequency band width.

[0097] According to the method provided by the embodiments of the present application, it can be known that in the embodiments of the present application, the sending node is used to adjust multiple subcarriers, and the receiving node receives signals according to the subcarriers adjusted by the sending node. None of these operations will cause an increase in subcarriers. Therefore, there is no need to add components related to the subcarriers in both the sending node and the receiving node, and the structures of the sending node and the receiving node will not become overly complex.

[0098] In addition, the method provided by the embodiments of the present application does not change the rate of the signal transmitted on the subcarriers. Therefore, this method has no rate requirements for the sending node and the receiving node, and this method can be applied to the current sending node and receiving node. Since this signal transmission method does not change the signal transmission rate, a series of problems caused by the reduction of the signal transmission rate will not occur.

[0099] Based on the signal transmission method provided by the embodiments of the present application, an embodiment of the present application provides a signal transmission device, and this signal transmission device may belong to the sending node in the foregoing embodiments. Exemplarily, as Figure 14 shown, this signal transmission device may include: a frequency shift module 1401, a rearrangement module 1402, and a sending module 1403.

[0100] The frequency shift module 1401 is used to frequency shift multiple subcarriers as a whole by the target frequency band width; the multiple subcarriers correspond to multiple signals to be transmitted one by one, and the signals to be transmitted are carried on the corresponding subcarriers; the target frequency band width is less than the frequency band width of the target subcarrier, and the target subcarrier is the edge subcarrier arranged in the frequency shift direction among the multiple subcarriers; the operations performed by the frequency shift module 1401 can refer to S101 in the foregoing embodiments, and the embodiments of the present application will not elaborate here.

[0101] The rearrangement module 1402 is configured to perform spectrum rearrangement on the first frequency band and the second frequency band obtained by splitting the target subcarriers respectively and arranged along the frequency shift direction; wherein, after the spectrum rearrangement, the first frequency band, other subcarriers among the multiple subcarriers except the target subcarrier, and the second frequency band are arranged along the frequency shift direction; the operations performed by the rearrangement module 1402 can refer to S102 in the foregoing embodiments, and details are not described herein in this embodiment of the present application.

[0102] The sending module 1403 is configured to send the corresponding signal to be transmitted on multiple subcarriers respectively. The operations performed by the sending module 1403 can refer to S103 in the foregoing embodiments, and details are not described herein in this embodiment of the present application.

[0103] Optionally, the center frequencies of the multiple subcarriers are offset relative to the center frequency of the sending node; the target frequency band width is determined based on the frequency band width of the target subcarrier and / or the offset parameter. By way of example, it is assumed that the center frequencies of the multiple subcarriers are offset relative to the center frequency of the sending node by a reference frequency band; the offset parameter includes: the offset direction and / or the frequency band width of the reference frequency band.

[0104] Optionally, when the offset direction is the same as the frequency shift direction, the target frequency band width is the difference between half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band. When the offset direction is opposite to the frequency shift direction, the target frequency band width is the sum of half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band.

[0105] This embodiment of the present application is also applicable to the case where the center frequencies of the multiple subcarriers are not offset relative to the center frequency of the sending node.

[0106] In addition, regardless of whether the center frequencies of the multiple subcarriers are offset relative to the center frequency of the sending node, the target frequency band width can be half of the frequency band width of the target subcarrier.

[0107] Optionally, the frequency band width of the first frequency band is equal to the target frequency band width. Of course, the frequency band width of the first frequency band may also not be equal to the target frequency band width.

[0108] This embodiment of the present application also provides another signal transmission device, which belongs to the receiving node in the foregoing embodiments. As Figure 15 shown, this signal transmission device includes: a determination module 1501 and a receiving module 1502.

[0109] The determination module 1501 is configured to determine the sub - carrier corresponding to the receiving node among multiple sub - carriers; the multiple sub - carriers correspond one - to - one to multiple signals to be transmitted, and the signals to be transmitted are carried on the corresponding sub - carriers; the target sub - carriers among the multiple sub - carriers include a first frequency band and a second frequency band, and the other sub - carriers among the multiple sub - carriers except the target sub - carriers are arranged between the first frequency band and the second frequency band;

[0110] The receiving module 1502 is configured to receive the signal to be transmitted on the sub - carrier corresponding to the receiving node.

[0111] Optionally, the frequency - band width of the first frequency band is the same as that of the second frequency band. Of course, the frequency - band width of the first frequency band may also be different from that of the second frequency band.

[0112] An embodiment of the present application also provides a chip, which includes a programmable logic circuit and / or program instructions, and when the chip runs, it is configured to implement the operations performed by the sending node or any receiving node in any signal transmission method provided by the embodiment of the present application.

[0113] An embodiment of the present application also provides a computer - readable storage medium, in which instructions are stored;

[0114] When the instructions run on a computer, the computer is made to execute the operations performed by the sending node or any receiving node in any signal transmission method provided by the embodiment of the present application.

[0115] The present application provides a computer program product containing instructions, and when the computer program product runs on a computer, the computer is made to execute the operations performed by the sending node or any receiving node in any signal transmission method provided by the present application.

[0116] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product, which includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium (such as a solid-state drive), etc.

[0117] In the present application, terms such as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "at least one" means one or more, and "a plurality" means two or more, unless otherwise clearly defined. The term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0118] The method embodiments, device embodiments, and other different types of embodiments provided in the embodiments of the present application can all refer to each other, and the embodiments of the present application do not limit this. The order of operations of the method embodiments provided in the embodiments of the present application can be appropriately adjusted, and the operations can also be increased or decreased accordingly. Any person skilled in the art within the technical scope disclosed in the present application can easily think of a changed method, which should be covered by the protection scope of the present application, so it will not be elaborated here.

[0119] In the corresponding embodiments provided in the present application, it should be understood that the disclosed systems, devices, etc. can be implemented in other constitutive manners. For example, the device embodiments described above are merely illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be indirect couplings or communication connections through some interfaces, devices or modules, and can be in electrical or other forms.

[0120] The units described as separate components may or may not be physically separated, and the components described as units may or may not be physical units. They can be located in one place or distributed to multiple devices. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0121] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A signal transmission method, characterized in that, The method is executed by a sending node, and the method includes: Overall frequency-shifting a plurality of subcarriers by a target frequency band width; the plurality of subcarriers correspond one-to-one to a plurality of signals to be transmitted, and the signals to be transmitted are carried on the corresponding subcarriers; the target frequency band width is less than the frequency band width of a target subcarrier, and the target subcarrier is an edge subcarrier among the plurality of subcarriers arranged in the direction of the frequency shift; Spectrum rearrangement is respectively performed on a first frequency band and a second frequency band obtained by splitting the target subcarrier and arranged in the direction of the frequency shift; wherein, after the spectrum rearrangement, the first frequency band, other subcarriers among the plurality of subcarriers except the target subcarrier, and the second frequency band are arranged in the direction of the frequency shift; The signals to be transmitted corresponding thereto are respectively transmitted on the plurality of subcarriers.

2. The method according to claim 1, characterized in that The center frequencies of the plurality of subcarriers are offset from the center frequency of the sending node by a reference frequency band; the target frequency band width is determined based on the frequency band width of the target subcarrier, the direction of the offset, and / or the frequency band width of the reference frequency band.

3. The method according to claim 2, wherein The direction of the offset is the same as the direction of the frequency shift, and the target frequency band width is the difference between half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band.

4. The method according to claim 2, wherein The direction of the offset is opposite to the direction of the frequency shift, and the target frequency band width is the sum of half of the frequency band width of the target subcarrier and the frequency band width of the reference frequency band.

5. The method according to claim 2, characterized in that, The target frequency band width is half of the frequency band width of the target subcarrier.

6. The method according to any one of claims 1 to 5, characterized in that The frequency band width of the first frequency band is equal to the target frequency band width.

7. A signal transmission method, characterized in that The method is executed by a receiving node, and the method includes: Determining the subcarrier corresponding to the receiving node among a plurality of subcarriers; the plurality of subcarriers correspond one-to-one to a plurality of signals to be transmitted, and the signals to be transmitted are carried on the corresponding subcarriers; the target subcarriers among the plurality of subcarriers include a first frequency band and a second frequency band, and other subcarriers among the plurality of subcarriers except the target subcarriers are arranged between the first frequency band and the second frequency band; Receiving the signal to be transmitted on the subcarrier corresponding to the receiving node.

8. The method according to claim 7, wherein The frequency band width of the first frequency band is the same as the frequency band width of the second frequency band.

9. A signal transmission device, characterized in that, The signal transmission device belongs to a sending node, and the signal transmission device includes: A frequency shift module, configured to overall frequency-shift a plurality of subcarriers by a target frequency band width; the plurality of subcarriers correspond one-to-one to a plurality of signals to be transmitted, and the signals to be transmitted are carried on the corresponding subcarriers; the target frequency band width is less than the frequency band width of a target subcarrier, and the target subcarrier is an edge subcarrier among the plurality of subcarriers arranged in the direction of the frequency shift; A rearrangement module, configured to respectively perform spectrum rearrangement on a first frequency band and a second frequency band obtained by splitting the target subcarrier and arranged in the direction of the frequency shift; wherein, after the spectrum rearrangement, the second frequency band, other subcarriers among the plurality of subcarriers except the target subcarrier, and the first frequency band are arranged in the direction of the frequency shift; A sending module, configured to respectively transmit the signals to be transmitted corresponding thereto on the plurality of subcarriers.

10. The signal transmission device according to claim 9, characterized in that The center frequencies of the multiple subcarriers are offset from the center frequency of the transmitting node by a reference frequency band; the target frequency band width is determined based on the frequency band width of the target subcarrier, the direction of the offset, and / or the frequency band width of the reference frequency band.

11. The signal transmission device according to claim 9 or 10, characterized in that, The frequency band width of the first frequency band is equal to the target frequency band width.

12. A signal transmission device, characterized in that, The signal transmission device belongs to a receiving node, and the signal transmission device includes: a determination module, configured to determine the subcarriers corresponding to the receiving node among multiple subcarriers; the multiple subcarriers correspond to multiple signals to be transmitted one by one, and the signals to be transmitted are carried on the corresponding subcarriers; the target subcarriers among the multiple subcarriers include a first frequency band and a second frequency band, and the other subcarriers among the multiple subcarriers except the target subcarriers are arranged between the first frequency band and the second frequency band; a receiving module, configured to receive the signals to be transmitted on the subcarriers corresponding to the receiving node.

13. The signal transmission device according to claim 12, characterized in that, The frequency band width of the first frequency band is the same as the frequency band width of the second frequency band.

14. A signal transmission system, characterized in that, including: a transmitting node and multiple receiving nodes; the transmitting node includes the signal transmission device according to any one of claims 9 to 11, and the receiving node includes the signal transmission device according to claim 12 or 13.

15. A chip, characterized in that, The chip includes a programmable logic circuit and / or program instructions, which are used to implement the signal transmission method according to any one of claims 1 to 8 when the chip runs.

16. A computer-readable storage medium, characterized in that, Instructions are stored in the computer-readable storage medium, and when the instructions run on a computer, the computer is caused to execute the signal transmission method according to any one of claims 1 to 8.

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