Data transmission method and device based on rate division multiple access technology

Abstract

The invention relates to the field of millimeter wave communication, in particular to a data transmission method and device based on a rate division multiple access technology, and the method comprises the following steps: inputting a bit information stream at a transmitter; performing block processing on the bit information stream; encoding the data stream subjected to the block processing; performing symbol mapping on the encoded data stream; pre-coding the data stream after symbol mapping to form a transmitting signal; a data stream is transmitted through a channel after a signal is transmitted through a transmitter, and a receiver receives the transmitted information stream, performs interference elimination on the data stream and obtains public information and private information of the information stream; and combining the public information stream and the private information stream to obtain a transmitted bit information stream. According to the invention, the bit data stream is split and combined at the transmitter, the frequency spectrum utilization rate in the information transmission process is increased, and the information transmission rate is improved.

Description

Technical Field

[0001] The present invention relates to the field of millimeter wave communications, and in particular to a data transmission method and device based on rate division multiple access technology. Background Art

[0002] In recent years, communication technology has experienced rapid development, from the initial fixed-line telephone to mobile phones, and then to the current Internet and Internet of Things technology. Every technological innovation is changing people's lifestyles, with a large increase in wireless communication devices and an increase in user access density. With the gradual popularization of 5G technology, people have begun to study 5G and 6G transmission technologies, and how to improve the access and transmission efficiency of devices is a key issue that needs attention.

[0003] Existing device access solutions mainly include orthogonal multiple access technology (OMA), space division multiple access technology (SDMA), non-orthogonal multiple access (NOMA) access technology and physical layer propagation technology. Rate-Splitting Multiple Access (RSMA) is a new type of multiple access technology. It splits and reconstructs user information at the transmitting end and uses serial interference cancellation technology at the receiving end, so that users can partially decode interference, thereby significantly improving spectrum efficiency and energy efficiency. Under the same radio resources, rate division multiple access technology has higher spectrum utilization, more flexible access mechanism and better user experience. Therefore, the research on rate division multiple access technology is of great significance.

[0004] It is well known that the transceiver structure in the rate division multiple access technology is different in the uplink and downlink, and the traditional transceiver is not flexible enough. Therefore, it is necessary to design a universal transceiver that can meet the requirements of the rate division multiple access technology. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to propose a data transmission method and device based on rate division multiple access technology, which splits and combines the bit data stream at the transmitter, increases the spectrum utilization rate during information transmission, and improves the transmission rate of information.

[0006] In order to achieve the above object, the technical solution specifically adopted by the present invention is as follows:

[0007] A data transmission method based on rate division multiple access technology comprises the following steps:

[0008] S1, input bit information stream at the transmitter;

[0009] S2, processing the bit information stream into blocks;

[0010] S3, encoding the data stream after block processing;

[0011] S4, symbol mapping is performed on the encoded data stream;

[0012] S5, pre-encoding the data stream after symbol mapping to form a transmission signal;

[0013] S6. After the data stream is transmitted by the transmitter, it is transmitted through the channel, and the receiver receives the transmitted information stream.

[0014] S7, after receiving the transmitted data stream, the receiver eliminates interference on the data stream and obtains public information and private information of the information stream;

[0015] S8, combining the public information stream and the private information stream to obtain a transmitted bit information stream;

[0016] Step 8-1: extracting the user's public information from the public information stream obtained in step S7;

[0017] Step 8-2: Combine the extracted public information stream and private information stream to obtain a transmitted information bit stream.

[0018] Furthermore, the step S2 comprises the following steps:

[0019] S2-1, splitting the input bit stream into a public data stream and a private information stream;

[0020] S2-2. Select block merging, bit merging or merge several data streams of the common information stream according to the corresponding parameter merging method.

[0021] Furthermore, step S3 includes the following steps:

[0022] S3-1, select appropriate encoding methods for different data streams to perform internal encoding and external encoding on the data streams;

[0023] S3-2, perform power allocation and DSSS spread spectrum on the data stream;

[0024] Among them, the inner coding and the outer coding can select the same coding method or different coding methods for different data streams.

[0025] Furthermore, the step S4 comprises the following steps:

[0026] S4-1, performing information exchange within the information flow for the data flow after the spread spectrum processing;

[0027] S4-2, performing QAM modulation on the data stream after information exchange;

[0028] Among them, during QAM modulation, the modulation order is determined and adjusted according to the channel status and user fairness during transmission.

[0029] Furthermore, in step S7, the interference elimination can be adjusted according to the interference degree of the received signal, including three situations: decoding interference, treating interference as noise, and partially decoding and partially treating interference as noise.

[0030] The present invention also provides a data transmission device based on rate division multiple access technology, which adopts the above data transmission method to realize information transmission, including a universal transmitter and a universal receiver, wherein the universal transmitter is used to realize transmission data stream block, coding, mapping and precoding, and the universal receiver is used to perform interference elimination and bit stream combination on the received transmission information to restore the transmission information. The functional modules loaded in the universal transmitter include:

[0031] Bitstream segmentation, used to split the bitstream and merge the data;

[0032] Bit coding, used to implement outer coding, inner coding, power allocation, and spread spectrum of bit streams;

[0033] Symbol mapping, used to convert data streams into signal streams that are easy to transmit;

[0034] Precoding is used to precode the encoded data stream to form a transmission signal.

[0035] The functional modules of the universal receiver include:

[0036] Interference cancellation is used to eliminate interference of the received signal, which mainly includes three situations: complete decoding interference, complete interference regarded as noise, and partial decoding and partial noise;

[0037] Bit stream combination is used to combine the public information stream with the private information stream to obtain a transmitted bit information stream, including bit stream extraction and bit stream merging.

[0038] The present invention has the following characteristics and beneficial effects:

[0039] The bit data stream is split and combined at the transmitter to increase the spectrum utilization during information transmission and improve the information transmission rate.

[0040] During the information transmission process, the transceiver is designed to increase the use scenarios of the transceiver, and the data stream is properly processed to improve the transmission rate during the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0042] Figure 1 It is a schematic diagram of a universal transmitter based on rate division multiple access technology in an embodiment of the present invention.

[0043] Figure 2 4 is a block diagram of the bit stream of a universal transmitter in an embodiment of the present invention.

[0044] Figure 3 4 is a bit encoding block diagram of a universal transmitter in an embodiment of the present invention.

[0045] Figure 4 It is a symbol mapping block diagram of a universal transmitter in an embodiment of the present invention.

[0046] Figure 5 4 is a precoding block diagram of a universal transmitter in an embodiment of the present invention.

[0047] Figure 6 It is a schematic diagram of a universal receiver based on rate division multiple access technology in an embodiment of the present invention.

[0048] Figure 7 FIG. 4 is a block diagram of interference elimination of a universal receiver in an embodiment of the present invention.

[0049] Figure 8 It is a bit stream combination block diagram of a universal receiver in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0051] In order to increase the spectrum utilization rate during information transmission and improve the transmission rate of information, the present invention provides a data transmission method based on rate division multiple access technology, comprising the following steps:

[0052] Step 1: The transmitter inputs the bit information stream b1Λb N ;

[0053] Step 2: Convert the bit information stream b1Λb N Perform block processing;

[0054] Step 2-1: Input bit stream b1Λb N Split the single bit stream b n Split into common data stream b c,n and private information flow bp,n, then the public information flow set is {W c,1 ΛW c,N}, the private information flow set is {W p,1 ΛW p,N};

[0055] Step 2-2: Select block merging, bit merging or corresponding parameter merging method to merge the common information stream into M data streams. Then the common information stream set is {W c,1 ΛW c,M}, the private information flow set is {W p,1 ΛW p,N};

[0056] Step 3: Encode the data stream after block processing in step 2;

[0057] Step 3-1: Select appropriate encoding methods for M+N data streams, perform internal encoding and external encoding on them, and obtain the data stream set v" after internal encoding and external encoding RS The suitable encoding method specifically refers to that when performing internal encoding and external encoding on different data streams, the same encoding method or different encoding methods can be selected.

[0058] Step 3-2: Perform power allocation and DSSS spread spectrum on the data stream;

[0059] Assuming the power allocation matrix is ​​F, then After power allocation, the data flow Spread spectrum is performed. This step can ensure the security of transmitted information and can also be used to distinguish different signals on the same spectrum.

[0060] Select DSSS spread spectrum technology for the transmitted bit stream. If the random sequence matrix generated in DSSS spread spectrum is L, then

[0061] Step 4: symbol mapping of the encoded data stream;

[0062] Step 4-1: Spread spectrum processed data stream v RS Interweaving information within the information flow can increase the speed of data transmission and reduce latency.

[0063] Step 4-2: Perform QAM modulation on the data stream after information interleaving, and transform the data stream matrix into s = [s1,Λ,s M ,Λ,s M+N ] T , and s∈C (M+N)×1 The modulation order of the QAM modulation can be determined and adjusted according to the channel state and user fairness during transmission.

[0064] Step 5: pre-encode the encoded data stream to form a transmission signal;

[0065] The precoding is obtained according to the transceiver scheme or the adjustment with feedback. Assume that the precoding matrix is ​​P matrix, P = [p1,Λ,p M ,Λ,p M+N ] and P∈C Nt×(M+N) , then the final transmission signal in the transmitter is: X=Ps.

[0066] Step 6: After the data stream is transmitted by the transmitter, it is transmitted through the channel, and the receiver receives the transmitted information stream. Specifically: Assume that the transmission channel is an AWGN channel and the channel vector is h n ∈C 1×Nt n∈{1,2,K,N}, and use z n The distribution is CN(0,σ 2 ) is the additive Gaussian white noise corresponding to the receiver, then the signal received by the receiver is y n =h n x+z n , n∈{1,2,K,N}.

[0067] Step 7: Eliminate interference on the received signal to obtain public information and private information of the information flow; specifically, the interference elimination can be adjusted according to the interference degree of the received signal, mainly including three situations: complete decoding interference, complete noise interference and partial decoding and partial noise. After interference elimination, the public information flow can be obtained. and private information flow

[0068] Step 8: Combining the public information stream with the private information stream to obtain a transmitted bit information stream;

[0069] Step 8-1: Public information flow obtained from step 7 Extracting user public information

[0070] Step 8-2: Extract the public information flow With private information flow Combined together, the transmitted information bit stream is obtained

[0071] The present invention carries out physical layer design for information transmission in the process of millimeter wave communication transmission from the perspective of flexibility and versatility, and provides a partial reference for the realization of the next generation of mobile communication technology.

[0072] Through the investigation of RSMA transmitters during transmission and combined with the overall application scenarios, the present invention designs the following Figure 1The universal transmitter architecture shown in FIG. 1 processes bit stream data during transmission. The functional blocks inside the universal transmitter mainly include bit stream segmentation, bit coding, symbol mapping and precoding.

[0073] Figure 2 The following is a block diagram of the bit stream segmentation of a general transmitter. Its functions mainly include bit stream segmentation and data merging. Assume that the input bit stream is b1Λb N First, the input bit stream is split into a common data stream. and private information flow At this time, the number of information streams is 2N. Then, block merging, bit merging or corresponding parameter merging methods are selected to merge the public information streams into M data streams. Then the public stream set is {W c,1 ΛW c,M}, the private flow set is {W p,1 ΛW p,N}.

[0074] Figure 3 This is a block diagram of the bit coding of a universal transmitter. Its functions mainly include external coding, internal coding, power allocation, and bit stream spread. Internal coding is to use different coding methods for different data streams. The coding methods between groups and within groups can be independent of each other or the same coding method can be used. External coding is to add check bits to the coded data stream to ensure its accuracy during transmission. The external coded data stream v" RS To allocate power, assume that the power allocation matrix is ​​F, then Then the transmitted data stream is spread spectrum. This step can ensure the security of the transmitted information and can also be used to distinguish different signals on the same spectrum. DSSS spread spectrum is adopted for the transmitted bit stream. If the generated random sequence matrix is ​​L, then

[0075] Figure 4 This is a symbol mapping block diagram of a universal transmitter, which is used to convert a data stream into a signal stream that is easy to transmit. Here, a group of data streams in transmission are selected for processing. For example, the encoded common data stream is v c,1 First, the information is interleaved, which can increase the speed of data transmission and reduce latency. Then the data stream after information interleaving is modulated by QAM, and after serial-to-parallel conversion, constellation mapping, pulse shaping, and multiplication with the carrier, the two circuits are finally added together to form the modulated data stream s c,1 Each data stream must be modulated by QAM, so the modulated data stream matrix is ​​s = [s1,Λ,s M ,Λ,s M+N ] T , s∈C (M+N)×1 .

[0076] Figure 5 This is a precoding block diagram of a general transmitter. The modulated data stream must be precoded before it can be transmitted to the transmitting antenna. Precoding can be an adjustment with feedback or a constraint without feedback. It has an impact on the fairness of data transmission and the quality of data after data transmission. If the rate constraint is selected for the precoding matrix, the constraints are as follows:

[0077]

[0078] C n ≥0

[0079] C n +R n ≥R0

[0080] tr(PP H )≤P t

[0081] In this constraint, C n For data stream b n The transmission speed of the split public data stream, R n For data stream b n The transmission speed of the split private data stream, R0 is the minimum rate to ensure the transmission quality, P t is the transmission power requirement. Based on this constraint, the precoding matrix P = [p1,Λ,p M ,Λ,p M+N ],P∈C Nt×(M+N) ; Then the final transmission signal in the transmitter is: X=Ps.

[0082] When the universal transmitter of the present invention is in operation, the transmission signal is transmitted based on the working process of steps 1 to 5 above.

[0083] Based on the above general transmitter architecture, the present invention designs the following Figure 6 The general receiver architecture shown in the figure mainly includes interference cancellation and bit stream combination.

[0084] Figure 7 This is a block diagram of interference elimination of a universal receiver. The interference elimination can adjust the elimination mode according to the interference degree of the received signal, mainly including three situations: completely decoding interference, completely treating interference as noise, and partially decoding and partially treating interference as noise.

[0085] Figure 8The block diagram of the bit stream combination of the universal receiver is used to combine the public information stream with the private information stream to obtain the transmitted bit information stream, including bit stream extraction and bit stream merging, wherein the bit stream extraction is used to extract the user's public information from the public information stream obtained in step 7. The bit stream merging is used to merge the extracted public information stream with the private information stream to obtain the transmitted information bit stream.

[0086] When the universal receiver of the present invention is in operation, the reception of the transmission signal and the recovery of the transmitted information flow are realized based on the above-mentioned working process of step 6 to step 8.

[0087] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A data transmission method based on rate division multiple access technology, characterized in that: The steps include: S1, input bit information stream at the transmitter; S2, processing the bit information stream into blocks; S3, encoding the data stream after block processing; S4, symbol mapping is performed on the encoded data stream; S5, pre-encoding the data stream after symbol mapping to form a transmission signal; S6, after the data stream is transmitted by the transmitter, it is transmitted through the channel, and the receiver receives the transmitted information stream; S7, after receiving the transmitted data stream, the receiver eliminates interference on the data stream and obtains public information and private information of the information stream; S8. Combine the public information stream and the private information stream to obtain a transmitted bit information stream.

2. A data transmission method based on rate division multiple access technology as claimed in claim 1, characterized in that: The step S2 comprises the following steps: S2-1, splitting the input bit stream into a public data stream and a private information stream; S2-2. Select block merging, bit merging or merge several data streams of the common information stream according to the corresponding parameter merging method.

3. A data transmission method based on rate division multiple access technology as claimed in claim 1, characterized in that: The step S3 comprises the following steps: S3-1, select appropriate encoding methods for different data streams to perform internal encoding and external encoding on the data streams; S3-2. Perform power allocation and DSSS spread spectrum on the data stream.

4. A data transmission method based on rate division multiple access technology as claimed in claim 1, characterized in that: The step S4 comprises the following steps: S4-1, performing information exchange within the information flow for the data flow after the spread spectrum processing; S4-2, performing QAM modulation on the data stream after information exchange; Among them, during QAM modulation, the modulation order is determined and adjusted according to the channel status and user fairness during transmission.

5. A data transmission method based on rate division multiple access technology as claimed in claim 1, characterized in that: In step S7, interference elimination includes three situations: decoding interference, treating interference as noise, and partially decoding and partially treating interference as noise.

6. A data transmission method based on rate division multiple access technology as claimed in claim 1, characterized in that: The step S8 comprises the following steps: Step 8-1: extracting the user's public information from the public information stream obtained in step S7; Step 8-2: Combine the extracted public information stream and private information stream to obtain a transmitted information bit stream.

7. A data transmission device based on rate division multiple access technology, characterized in that: The data transmission method according to any one of claims 1 to 6 is used to realize information transmission.

8. The data transmission device based on rate division multiple access technology as claimed in claim 7, characterized in that: It includes a universal transmitter and a universal receiver, wherein the functional modules of the universal transmitter include bit stream segmentation, bit coding, symbol mapping and precoding, and the functional modules of the universal receiver include interference elimination and bit stream combination.

9. The data transmission device based on rate division multiple access technology as claimed in claim 8, characterized in that: The bit stream blocks are used to realize the splitting of the bit stream and the merging of data; The bit coding is used to implement outer coding, inner coding, power allocation and spread spectrum of bit stream; The symbol mapping is used to convert the data stream into a signal stream that is easy to transmit; The precoding is used to precode the encoded data stream to form a transmission signal.

10. The data transmission device based on rate division multiple access technology as claimed in claim 8, characterized in that: The interference elimination is used to eliminate the interference of the received signal, including three situations: completely decoding interference, completely treating interference as noise, and partially decoding and partially treating interference as noise; The bit stream combination is used to combine the public information stream with the private information stream to obtain the transmitted bit information stream, including bit stream extraction and bit stream merging.

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