WO2016078303A1 - Data transmission method and apparatus - Google Patents

Abstract

Disclosed are a data transmission method and apparatus. In the method, a data bit group is mapped as a complex number sequence by means of a codebook, wherein every currently output k data bits are set as a data bit group, the length of the complex number sequence is L, all the elements in the complex number sequence are complex numbers, values of a real part and an imaginary part of each element come from a set of M real numbers, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2; and the complex number sequence is sent. According to the technical scheme provided in the present invention, interference among multiple users can be effectively controlled, and communication performance of access of the multiple users can be effectively improved.

Description

Data transmission method and device Technical field

The present invention relates to the field of communications, and in particular to a data transmission method and apparatus.

Background technique

The uplink multi-user access communication in the related art can be implemented by different multiple access technologies, for example, Time Division Multiple Access (TDMA), Frequency Division Multiple Access (Frequency Division Multiple) Access, abbreviated as FDMA), Code Division Multiple Access (CDMA) and Space Division Multiple Access (SDMA); among them, code division multiple access (CDMA) Technology is a very important class for implementing uplink multi-user access communications, which can provide excellent access performance and has been adopted by multiple wireless communication standards.

For the access procedure using CDMA, first, multiple access terminals respectively use a certain length of extended sequence (for example, an extended sequence of L elements composed of L elements, wherein the elements can be digital symbols) to be sent data. The data symbols after amplitude and phase modulation (for example, Quadrature Amplitude Modulation (QAM)) are subjected to extension processing; wherein the extension processing means that each modulated data symbol is multiplied by each element of the extended sequence Forming a sequence of symbols having the same length as the extended sequence used; specifically, in the above process, each modulated data symbol (for example, a corresponding constellation point symbol after QAM modulation of the data to be transmitted) and a length L Multiplying each element of the spreading sequence causes each modulated data symbol to be expanded to the same sequence of symbols as the length of the spreading sequence employed, ie each modulated data symbol is expanded into L symbols, which is equivalent Each modulated data symbol is carried by the extended sequence of length L; and then, the extension of the plurality of access terminals The obtained symbol sequence can be transmitted on the same time-frequency resource; finally, the base station receives the signal that the extended signals of the plurality of access terminals are superimposed after being wirelessly propagated, and is received from the received superimposed signal by the multi-user receiving detection technology. Separate the useful information of each terminal.

CDMA belongs to the category of spread spectrum communication, because the data symbols after the terminal modulation are extended to L symbols by using the extended sequence of length L, and the transmission time of the L symbols after the extension processing is equal to that before the expansion. The transmission time of the data symbols, then the bandwidth required to transmit the L symbols after the extension processing needs to be expanded by L times, so the spreading sequence is often referred to as a spreading sequence.

The symbols obtained by the extended processing of the access terminal may be multi-carrier technology (for example, Orthogonal Frequency Division Multiplexing (OFDM), Filter-Bank Multi-Carrier (abbreviation) For FBMC)) to transmit, code division multiple access and multi-carrier technology The combination is Multi-Carrier Code Division Multiple Access (MC-CDMA).

In CDMA technology, the spreading process of the transmitter is relatively simple: multiplying each modulated data symbol by each element of the extended sequence of length L to obtain the extended L symbols, and then by single carrier technology or Multi-carrier technology is transmitted; the receiving process of the base station receiver is relatively complicated. How to accurately separate the useful data information of each terminal from the superimposed signal to ensure the multiple access performance of the CDMA system is the key to the CDMA system, which involves two aspects, namely, extended sequence and reception. Machine, where the selection of the extended sequence is the performance basis, and the design of the receiver is performance guarantee.

Specifically, in order to obtain excellent multiple access performance, good cross-correlation characteristics are required between the extended sequences used by different terminals. If single-carrier code division multiplexing is used, the extended sequence used by the terminal also needs to have good autocorrelation characteristics to counter the influence of multipath delay spread; multi-carrier code division multiplexing technology can rely on multi-carrier technology. Against the influence of multipath delay spread, the design of the extended sequence can focus on the cross-correlation properties that facilitate the separation of multi-user information from the receiver.

Based on the design of the extended sequence, the base station can use high-performance multi-user reception detection technology to separate multi-user information and obtain excellent multiple access performance, such as: Serial Interference Cancellation (SIC) reception. Detection technology, but its complexity is relatively high.

The selection and design of the extended sequence is an important aspect of CDMA technology. Direct Sequence-Code Division Multiple Access (DS-CDMA) technology is a commonly used CDMA technology and has been used as uplink multi-user access for multiple wireless communication standards and systems. Technology, its extended sequence uses a simple binary pseudo-random (Pseudo-Noise, PN for short) real sequence. Also, DS-CDMA based on a binary PN real number sequence is also applied to the MC-CDMA technology. The binary pseudo-random real number sequence may also be referred to as a binary pseudo-random sequence, and the value of each element or symbol is usually represented as 0 or 1, and may be further expressed as a bipolar sequence, that is, 0 is represented as +1, and 1 represents It is -1, or 0 is represented as -1, and 1 is represented as +1.

The design of the extended sequence also needs to consider the length of the extended sequence. The longer the extended sequence, the easier the cross-correlation between the extended sequences used by different terminals is, and the easier it is to select more sequences with low cross-correlation. Therefore, more terminals can be supported for simultaneous access. If the number of terminals simultaneously accessed is greater than the length of the extended sequence, the system is considered to be in an overload state.

Supporting a large number of users simultaneously accessing the system for communication is an important requirement for future wireless communication, which can be considered by designing a multi-user access communication system with better overload capability based on code division multiple access.

From the perspective of multi-user information theory, the non-orthogonal multiple access method can achieve greater system capacity or edge throughput than the orthogonal multiple access method. Therefore, in order to provide flexible system design, support more Users are simultaneously accessed, and different access terminals may use non-orthogonal spreading sequences. Since the spreading sequences of different access terminals are not orthogonal to each other, the receiving and detecting performance of each access terminal may be degraded as the number of terminals simultaneously accessed increases, and interference between multiple users may become excessive when the system is overloaded. more serious.

In order to achieve simplicity, the current code division multiple access technology uses a spread sequence based on a binary pseudo-random real number sequence, but a binary pseudo-random real number sequence, especially between short-length binary pseudo-random real numbers. Low cross-correlation is not easy to guarantee. When a large number of users access the system for communication at the same time, or when the system is overloaded, serious multi-user interference will occur, which affects multi-user reception detection performance and multi-user access communication performance.

Summary of the invention

The embodiment of the invention provides a data transmission method and device, so as to at least solve the problem that the code division multiple access technology in the related art is usually based on a sequence of binary pseudo-random real numbers, which may cause serious multi-user interference and influence. Multi-users receive problems with detection performance and multi-user access communication performance.

According to an aspect of an embodiment of the present invention, a data transmission method is provided.

A data transmission method according to an embodiment of the present invention includes: mapping a data bit group into a complex sequence by a codebook, wherein each k data bits of the current output are set as a data bit group, and the length of the complex sequence is L, in the complex sequence All elements are complex and the values of the real and imaginary parts of each element are derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is greater than or equal to 2. Integer; sends a complex sequence.

Preferably, every k data bits currently output by the channel encoder of the transmitter are set as data bit groups.

Preferably, the codebook comprises N complex sequences of length greater than or equal to L, wherein N is an integer greater than or equal to 1, and all elements in each complex sequence are complex and the real and imaginary parts of each element The values are all from the M-ary real number set.

Preferably, the codebook comprises 2 ^k complex sequences of length greater than or equal to L, wherein all elements in each complex sequence are complex numbers and the values of the real and imaginary parts of each element are derived from M-ary real numbers set.

Preferably, the set of M-ary real numbers comprises one of: a set of M integers in the range [-(M-1)/2, (M-1)/2], where M is an odd number; [-(M -1), a set of M odd numbers in the range of (M-1)], where M is an even number; M integers in the range [-(M-1)/2, (M-1)/2] M times multiplied by the corresponding normalization coefficient a set of real numbers, wherein M is an odd number; a set of M real numbers obtained by multiplying M odd numbers in the range [-(M-1), (M-1)] by a corresponding normalization coefficient, wherein , M is an even number.

Preferably, mapping the data bit group into the complex sequence by using the codebook comprises: obtaining a complex sequence of length L corresponding to each k data bits from the codebook according to a preset rule, where the preset rule includes at least one of the following: : index information represented by the value of each k data bit, correspondence value of different values of k data bits and correspondence information of different complex sequences in the codebook, correspondence of each k data bits with a complex sequence in the codebook Relationship information, sequence information or position information in which each k data bits are located, sequence information or position information obtained by performing a remainder operation with respect to the order or position of each k data bits relative to the number of complex sequences in the codebook, Subset information or subsequence information of the codebook; each k data bits are mapped into a complex sequence of length L.

Preferably, mapping the data bit group into the complex sequence by using the codebook comprises: acquiring, according to a preset rule, a complex sequence of length L corresponding to each k data bits from a codebook corresponding to each k data bits, where k The different values of the data bits correspond to different codebooks; the preset rule includes at least one of the following: correspondence information between each k data bits and a complex sequence in the corresponding codebook, where each k data bits are located Sequence information or position information, sequence information or position information obtained by calculating the order or position of each k data bits relative to the number of complex sequences in its corresponding codebook, and different values of k data bits Subset information or subsequence information of each codebook, subset information or subsequence information of the codebook corresponding to each k data bits; mapping each k data bits into a complex sequence of length L.

Preferably, mapping the data bit group into the complex sequence by using the codebook comprises: acquiring, according to a preset rule, a complex sequence of length L corresponding to each k data bits from a codebook corresponding to each k data bits, where each The k data bits correspond to one codebook, and the preset rule includes at least one of the following: index information represented by values of each k data bits, and different values of k data bits and codebooks corresponding to each k data bits Correspondence information of different complex sequences, correspondence information of each complex sequence of k data bits and its corresponding codebook, sequence information or position information of each k data bits, every k data bits are located Sequence information or position information obtained by performing a remainder operation with respect to the number of complex sequences in its corresponding codebook, and subset information or subsequence information of the codebook corresponding to each k data bits; The data bits are mapped into a complex sequence of length L.

Preferably, transmitting the complex sequence comprises: performing carrier modulation on the complex sequence to generate a transmit signal; and transmitting the transmit signal.

According to another aspect of an embodiment of the present invention, another data transmission method is provided.

A data transmission method according to an embodiment of the present invention includes: receiving signals transmitted by K transmitters, where K is an integer greater than or equal to 1, and each transmitter transmits a signal that the transmitter passes a codebook for its data bit group The complex sequence mapped to the carrier is formed by carrier modulation. Each transmitter sets each k data bit of the current output as a data bit group, the length of the complex sequence is L, and all elements in the complex sequence are complex and each element The real and imaginary values are derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2; the received signal is received from the codebook Get the data sent by K transmitters.

Preferably, the interference cancellation signal detector of the receiver is used for receiving detection of the received signal, and acquiring data transmitted by the K transmitters.

Preferably, the signals transmitted by the K transmitters are the transmission signals respectively formed by the K transmitters on the same time-frequency resource.

Preferably, the codebooks applied by the K transmitters are different.

According to still another aspect of an embodiment of the present invention, a data transmission device is provided.

A data transmission apparatus according to an embodiment of the present invention includes: a mapping module configured to map a data bit group into a complex sequence by a codebook, wherein each of the currently outputted data bits is set as a data bit group, and the length of the complex sequence is L, all elements in the complex sequence are complex and the values of the real and imaginary parts of each element are derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is An integer greater than or equal to 2; a transmitting module configured to transmit a complex sequence.

Preferably, every k data bits currently output by the channel encoder of the transmitter are set as data bit groups.

Preferably, the codebook comprises N complex sequences of length greater than or equal to L, wherein N is an integer greater than or equal to 1, and all elements in each complex sequence are complex and the real and imaginary parts of each element The values are all from the M-ary real number set.

Preferably, the codebook comprises 2 ^k complex sequences of length greater than or equal to L, wherein all elements in each complex sequence are complex numbers and the values of the real and imaginary parts of each element are derived from M-ary real numbers set.

Preferably, the set of M-ary real numbers comprises one of: a set of M integers in the range [-(M-1)/2, (M-1)/2], where M is an odd number; [-(M -1), a set of M odd numbers in the range of (M-1)], where M is an even number; M integers in the range [-(M-1)/2, (M-1)/2] a set consisting of M real numbers obtained by multiplying the corresponding normalization coefficients, where M is an odd number; M odd numbers in the range [-(M-1), (M-1)] are respectively multiplied by corresponding returns A set of M real numbers obtained by a coefficient, wherein M is an even number.

Preferably, the mapping module includes: a first acquiring unit, configured to acquire, from the codebook, a complex sequence of length L corresponding to each k data bits according to a preset rule, where the preset rule includes at least one of the following: The index information represented by the values of the k data bits, the correspondence between the different values of the k data bits and the different complex sequences in the codebook, and the correspondence relationship information between each k data bits and a complex sequence in the codebook Sequence information or position information in which each k data bits are located, sequence information or position information obtained by calculating the order or position of each k data bits relative to the number of complex sequences in the codebook, codebook Subset information or subsequence information; a first mapping unit arranged to map each k data bits into a complex sequence of length L.

Preferably, the mapping module comprises: a second obtaining unit, configured to acquire, according to a preset rule, a complex sequence of length L corresponding to each k data bits from a codebook corresponding to each k data bits, wherein k data The different values of the bits correspond to different codebooks; the preset rule includes at least one of the following: correspondence information of a complex sequence of each k data bits and its corresponding codebook, and sequence information of each k data bits Or position information, the order or position of each k data bits is compared with the number of complex sequences in the corresponding codebook to obtain the sequence information or position information obtained by the remainder operation, and the different values of the k data bits correspond to Subset information or subsequence information of each codebook, subset information or subsequence information of a codebook corresponding to each k data bits; and second mapping unit, configured to map each k data bits into a complex number of length L sequence.

Preferably, the mapping module comprises: a third obtaining unit, configured to acquire, according to a preset rule, a complex sequence of length L corresponding to each k data bits from a codebook corresponding to each k data bits, wherein each k The data bit corresponds to a codebook, and the preset rule includes at least one of the following: index information represented by the value of each k data bit, and different values of the k data bits are different from the codebook corresponding to each k data bits. Correspondence information of a complex sequence, correspondence information of a complex sequence of each k data bits and its corresponding codebook, sequence information or position information of each k data bits, sequence of every k data bits Or sequence information or position information obtained by performing a remainder operation with respect to the number of complex sequences in the corresponding codebook, subset information or subsequence information of the codebook corresponding to each k data bits; third mapping unit, It is set to map every k data bits into a complex sequence of length L.

Preferably, the sending module comprises: a generating unit configured to perform carrier modulation on the complex sequence to generate a transmitting signal; and a transmitting unit configured to transmit the transmitted signal.

According to still another aspect of an embodiment of the present invention, another data transmission device is provided.

A data transmission apparatus according to an embodiment of the present invention includes: a receiving module configured to receive signals transmitted by K transmitters, where K is an integer greater than or equal to 1, and each transmitter transmits a signal that is the transmitter's data The bit group is formed by carrier modulation of the complex sequence to which the codebook is mapped. Each transmitter sets each k data bit of the current output as a data bit group, and the length of the complex sequence is L, and all elements in the complex sequence are The value of the real part and the imaginary part of each element is derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2; And being configured to acquire data sent by the K transmitters from the received signal according to the codebook.

Preferably, the interference cancellation signal detector of the receiver is used for receiving detection of the received signal, and acquiring data transmitted by the K transmitters.

Preferably, the signals transmitted by the K transmitters are the transmission signals respectively formed by the K transmitters on the same time-frequency resource.

Preferably, the codebooks applied by the K transmitters are different.

According to an embodiment of the present invention, a data bit group is mapped to a complex sequence by using a codebook, wherein each k data bit of the current output is set as a data bit group, and the length of the complex sequence is L, and all elements in the complex sequence are The value of the real part and the imaginary part of each element is derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2; The sequence is transmitted, which solves the problem that the code division multiple access technology in the related art is usually based on the extended sequence of the binary pseudo-random real number sequence, which may cause serious multi-user interference, affecting multi-user reception detection performance and multi-user access communication. The problem of performance, in turn, can effectively control inter-user interference and effectively improve multi-user access communication performance.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flow chart of a data transmission method according to an embodiment of the present invention;

2 is a flow chart of another data transmission method according to an embodiment of the present invention;

3 is a schematic diagram of a transmitter mapping each k data bits through a codebook into a complex sequence of length L, in accordance with a preferred embodiment of the present invention;

4 is a schematic diagram of another transmitter mapping each k data bits through a codebook into a complex sequence of length L according to a preferred embodiment of the present invention;

5 is a schematic diagram of still another transmitter mapping each k data bits through a codebook into a complex sequence of length L according to a preferred embodiment of the present invention;

6 is a schematic diagram of a transmitter mapping each k data bits through a codebook to a complex sequence of length L according to a preferred embodiment of the present invention;

7 is a schematic diagram of another transmitter for mapping every k data bits through a codebook into a complex sequence of length L according to a preferred embodiment 2 of the present invention;

8 is a schematic diagram of a transmitter according to a preferred embodiment 3 of the present invention mapping each k data bits through a codebook into a complex sequence of length L;

9 is a schematic diagram of another transmitter for mapping every k data bits through a codebook into a complex sequence of length L according to a preferred embodiment 3 of the present invention;

10 is a schematic diagram of K transmitters performing data transmission and receiver performing serial interference cancellation SIC reception detection according to a preferred embodiment 4 of the present invention;

11 is a block diagram showing the structure of a data transmission device according to an embodiment of the present invention;

Figure 12 is a block diagram showing the structure of a data transmission device in accordance with a preferred embodiment of the present invention;

FIG. 13 is a block diagram showing the structure of another data transmission apparatus according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

1 is a flow chart of a data transmission method in accordance with an embodiment of the present invention. The method can be applied to a transmitter, which can be applied to a terminal or a terminal transmitter, and can also be applied to a base station or a base station transmitter. As shown in FIG. 1, the method can include the following processing steps:

Step S102: mapping a data bit group into a complex sequence by using a codebook, wherein each k data bit currently output is set as a data bit group, the length of the complex sequence is L, and all elements in the complex sequence are plural and each The values of the real part and the imaginary part of each element are derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2;

Step S104: transmitting the complex sequence.

The code division multiple access technology in the related art is generally based on an extended sequence of binary pseudo-random real numbers, which may cause severe multi-user interference, affecting multi-user reception detection performance and multi-user access communication performance. Adoption In the method shown in Figure 1, the transmitter maps each k data bits through a codebook into a complex sequence of length L and transmits them, when multiple transmitters respectively map respective data bits to respective complex codes through respective codebooks. And when transmitting through the same time-frequency resource, the low cross-correlation between signals transmitted by different transmitters can be effectively ensured, because the complex sequence has greater design freedom, and it is easier to ensure that different transmitters have selected A complex sequence of low cross-correlation to map its data bits; in addition, each k bits of data can be used as a data bit group, and the transmitter can also map different data bit groups with the same value into different complex sequences. Interference randomization or averaging. This makes it possible to effectively control interference between multiple users.

In a preferred implementation, the data bit group is set by every k data bits output by the transmitter's channel coder.

Preferably, the codebook may include N complex sequences of length greater than or equal to L, where N is an integer greater than or equal to 1, and all elements in each complex sequence are complex and the real and virtual of each element The values of the parts are all derived from the M-ary real number set.

Preferably, the above codebook may include 2 ^k complex sequences whose length is greater than or equal to L, wherein all elements in each complex sequence are complex numbers and the values of the real part and the imaginary part of each element are from M A collection of real numbers.

Preferably, the above M-ary real number set may include but is not limited to one of the following:

(1) A set of M integers in the range [-(M-1)/2, (M-1)/2], where M is an odd number;

(2) A set of M odd numbers in the range [-(M-1), (M-1)], where M is an even number;

(3) A set of M real numbers obtained by multiplying M integers in the range [-(M-1)/2, (M-1)/2] by a corresponding normalization coefficient, where M is an odd number ;

(4) A set of M real numbers obtained by multiplying M odd numbers in the range [-(M-1), (M-1)] by a corresponding normalization coefficient, where M is an even number.

Preferably, in step S102, mapping the data bit group into the complex sequence by the codebook may include the following operations:

Step S1: Obtain a complex sequence of length L corresponding to each k data bits from the codebook according to a preset rule, where the preset rule may include but is not limited to at least one of the following:

(1) index information represented by the value of each k data bits;

(2) correspondence information of different values of k data bits and different complex sequences in the codebook;

(3) correspondence information between each k data bits and a complex sequence in the codebook;

(4) Sequence information or position information in which each k data bits are located;

(5) Sequence information or position information obtained by performing a remainder operation with respect to the order or position of each k data bits relative to the number of complex sequences in the codebook;

(6) subset information or subsequence information of the codebook;

Step S2: Map each k data bits into a complex sequence of length L.

Preferably, in step S102, mapping the data bit group into the complex sequence by the codebook may include the following steps:

Step S3: Obtain a complex sequence of length L corresponding to each k data bits from a codebook corresponding to each k data bits according to a preset rule, where different values of k data bits correspond to different codebooks; The foregoing preset rules may include, but are not limited to, at least one of the following:

(1) correspondence information of a complex sequence of each k data bits and its corresponding codebook;

(2) Sequence information or position information in which each k data bits are located;

(3) order information or position information obtained by performing a remainder operation with respect to the order or position of each k data bits relative to the number of complex sequences in its corresponding codebook;

(4) subset information or sub-sequence information of each codebook corresponding to different values of k data bits;

(5) subset information or subsequence information of the codebook corresponding to each k data bits;

Step S4: Map each k data bits into a complex sequence of length L.

Preferably, in step S102, mapping the data bit group into the complex sequence by the codebook may include the following operations:

Step S5: Obtain a complex sequence of length L corresponding to each k data bits from a codebook corresponding to each k data bits according to a preset rule, where each k data bits corresponds to one codebook, and the foregoing preset rule It may include but is not limited to at least one of the following:

(1) index information represented by the value of each k data bits;

(2) correspondence information of different values of k data bits and different complex sequences in a codebook corresponding to each k data bits;

(3) correspondence information of a complex sequence of each k data bits and its corresponding codebook;

(4) Sequence information or position information in which each k data bits are located;

(5) Sequence information or position information obtained by performing a remainder operation with respect to the order or position of each k data bits relative to the number of complex sequences in its corresponding codebook;

(6) subset information or subsequence information of the codebook corresponding to each k data bits;

Step S6: Map each k data bits into a complex sequence of length L.

Preferably, in step S104, transmitting the complex sequence may include the following steps:

Step S7: performing carrier modulation on the complex sequence to generate a transmission signal, where the carrier modulation may be single carrier modulation or multi-carrier modulation;

Step S8: transmitting the transmitted signal.

2 is a flow chart of another data transmission method according to an embodiment of the present invention. The method can be applied to a receiver, which can be applied to a base station or a base station receiver, and can also be applied to a terminal or a terminal receiver. As shown in FIG. 2, the method can include the following processing steps:

Step S202: Receive signals transmitted by K transmitters, where K is an integer greater than or equal to 1, and the signal transmitted by each transmitter is carrier-modulated by the transmitter for the complex sequence to which the data bits are mapped by the codebook. Formed, each transmitter sets each k data bits of the current output as a data bit group, the length of the complex sequence is L, all elements in the complex sequence are complex numbers and the real and imaginary parts of each element are taken The values are all from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2;

Step S204: Acquire data transmitted by the K transmitters from the received signal according to the codebook.

By combining the above transmitter with the receiver using the interference cancellation signal detector, the multi-user access communication performance can be effectively improved, thereby supporting a higher system overload level and improving the user's experience of non-orthogonal multiple access communication.

Preferably, the interference cancellation signal detector of the receiver is used for receiving detection of the received signal, and acquiring data transmitted by the K transmitters.

In a preferred embodiment, the interference cancellation signal detector may be a serial interference cancellation SIC signal detector or the like.

Preferably, the signals transmitted by the K transmitters are the transmission signals respectively formed by the K transmitters on the same time-frequency resource.

Preferably, the codebooks applied by the K transmitters are different.

In a preferred embodiment, when K transmitters in the system apply the above data transmission method for data transmission on the same time-frequency resource, the codebooks applied in the respective transmitters are different, and K transmitters transmit After the signal propagates through the wireless channel, the receiver receives the superimposed signal of the signals transmitted by the K transmitters.

The preferred embodiment of the present invention does not impose any limitation on the specific signal detecting method. In addition, in the signal detection process, the receiver needs to use the codebook applied in the data transmission method in each transmitter to identify the signals transmitted by the respective transmitters, including but not limited to: identifying the designated transmission by specifying the codebook of the transmitter. The signals transmitted by the transmitter, or the codebooks of the K transmitters, identify the signals transmitted by the respective transmitters, or identify the signals transmitted by the respective transmitters through all available codebooks of the system.

The above preferred implementation process will be further described below in conjunction with the following preferred embodiments.

Preferred embodiment 1

The transmitter maps every 2 data bits output by its channel encoder to a complex sequence of length L through a codebook, wherein the codebook can be set in one of the following ways:

(1) preset by the system;

(2) The system is configured by signaling;

(3) Determined by the transmitter according to a preset rule, for example, generated by the transmitter independently.

In the codebook, 2 ² = 4 complex sequences of length L (respectively denoted as L ₀ , L ₁ , L ₂ , L ₃ ), wherein L is an integer greater than 1, and each length is L Each element in the complex sequence is a complex number, and the value of the real and imaginary parts of each element comes from the set of ternary real numbers, that is, the set consisting of [-1, 0, 1].

Assume that the data bits output by the transmitter channel encoder are: "0,0,1,0,0,1,1,1,0,1,1,0,1,1,0,0", which will be every 2 The data bits are treated as a data bit group: "00,10,01,11,01,10,11,00", then, with Body, the transmitter maps every 2 data bits output by its channel coder through the codebook to a complex sequence of length L:

3 is a schematic diagram of a transmitter mapping each k data bits through a codebook into a complex sequence of length L, in accordance with a preferred embodiment of the present invention. As shown in FIG. 3, the transmitter determines, from the codebook, a complex sequence of length L corresponding to each of the two data bits according to the index information represented by the value of each of the two data bits, and maps each of the two data bits into a The determined complex sequence of length L is L. Since every 2 data bits are converted to decimal values: "0, 2, 1, 3, 1, 2, 3, 0", the transmitter uses the value of every 2 data bits as an index from the codebook. It is determined that the complex sequence length L corresponding to each of the two data bits is: "L ₀ , L ₂ , L ₁ , L ₃ , L ₁ , L ₂ , L ₃ , L ₀ ", and then the transmitter will be every 2 The data bits are mapped to the determined complex sequence of length L.

Alternatively, FIG. 4 is a schematic diagram of another transmitter mapping each k data bits through a codebook into a complex sequence of length L in accordance with a preferred embodiment of the present invention. As shown in FIG. 4, the transmitter determines, according to the correspondence between the different values of the two data bits and the different complex sequences in the codebook, a complex sequence of length L corresponding to each of the two data bits from the codebook, and Each of the two data bits is mapped to the determined complex sequence of length L; the different values of the two data bits include: 00, 01, 10, and 11 cases, and the system can determine the four different ways in one of the following ways: Correspondence between the value and the four complex sequences in the codebook:

(1) the way the system is preset;

(2) The way the system is configured through signaling, such as semi-static control signaling or dynamic control signaling;

(3) The manner in which the transmitter is determined according to a preset rule, for example, determined in a random manner;

For example, 00 corresponds to the complex sequence L ₀ , 01 corresponds to the complex sequence L ₁ , 11 corresponds to the complex sequence L ₂ , and 10 corresponds to the complex sequence L ₃ ;

Then, the transmitter can determine, according to the correspondence, that the complex sequence length L corresponding to each of the two data bits is: "L ₀ , L ₃ , L ₁ , L ₂ , L ₁ , L ₃ , L ₂ , L ₀ ”, then the transmitter maps every 2 data bits to the determined corresponding complex sequence of length L.

Alternatively, FIG. 5 is a schematic diagram of another transmitter that maps every k data bits through a codebook into a complex sequence of length L in accordance with a preferred embodiment of the present invention. As shown in FIG. 5, the transmitter determines, according to the correspondence information of each of the two data bits and a complex sequence in the codebook, a complex sequence of length L corresponding to each of the two data bits from the codebook, and each of the two The data bits are mapped to the determined complex sequence of length L; the system can determine the correspondence between each of the two data bits and a complex sequence in the codebook in one of the following ways:

(1) the way the system is preset;

(2) The way the system is configured through signaling, such as semi-static control signaling or dynamic control signaling;

(3) The manner in which the transmitter is determined according to a preset rule, for example, determined in a random manner;

For example: "00,10,01,11,01,10,11,00" corresponds one-to-one with "L ₀ , L ₁ , L ₂ , L ₃ , L ₀ , L ₁ , L ₂ , L ₃ ", respectively. Then, the transmitter can determine, according to the correspondence, that the complex sequence of length L corresponding to each of the two data bits is: "L ₀ , L ₁ , L ₂ , L ₃ , L ₀ , L ₁ , L ₂ , L ₃ ”, then the transmitter maps every 2 data bits to the determined corresponding complex sequence of length L.

Finally, the transmitter performs carrier modulation on the complex sequence obtained by the codebook mapping (for example, OFDM-based multi-carrier modulation, etc.), forms a transmission signal, and transmits it.

In the preferred embodiment, the complex sequence of length L included in the codebook may also be set to other numbers, for example: 8 complex sequences of length L (respectively denoted as L ₀ , L ₁ , ..., L ₆ , L ₇ ); for the four different value cases 00, 01, 10, 11 of 2 data bits, the system can be determined by a preset manner, or a signaling configuration manner, or a method determined by the transmitter according to a preset rule. Determining that each value corresponds to two complex sequences in the codebook, for example, 00 corresponds to the complex sequence L ₀ , L ₁ , 01 corresponds to the complex sequence L ₂ , L ₃ , 11 and the complex sequence L ₄ , L ₅ corresponds, 10 corresponds to the complex sequence L ₆ , L ₇ ; then, the transmitter can be based on the order information or position information of every 2 data bits, or the order or position of each 2 data bits relative to the code The number of complex sequences in the present is subjected to the order information or position information obtained by the remainder operation or a random manner to determine a complex sequence of length L corresponding to each of the two data bits. Taking "00" as an example, when every 2 data bits "00" are in an even order or position, it is determined that the corresponding complex sequence is L ₀ , and when every 2 data bits "00" are in an odd order or position, it is determined. Its corresponding complex sequence is L ₁ .

In the preferred embodiment, the transmitter can treat every 2 data bits as a data bit group similar to mapping each 2 data bits to a constellation point of the QPSK modulation constellation. In addition, the transmitter may sequentially output the channel encoder output every 2 data bits as one data bit group and map the data bits into a complex sequence; or the transmitter may serially convert the data bits output by the channel encoder, so that Each of the two data bits becomes a data bit group, and then each data bit group is simultaneously mapped into a complex sequence by the codebook, and each of the obtained complex sequences can be further parallel-transformed to form a complex sequence that needs to be transmitted finally.

In the preferred embodiment, the length L of each complex sequence in the codebook may take, for example, a value of 4, 8, or 16.

In the preferred embodiment, the values of the real part and the imaginary part of each element of each complex sequence in the codebook may also be derived from a set of binary real numbers, that is, a set consisting of [-1, 1]; It can also come from a set of quaternary real numbers, that is, a set composed of [-3, -1, 1, 3].

In the preferred embodiment, each complex sequence in the codebook may also be an energy normalized complex sequence obtained by multiplying the normalization coefficients.

In the preferred embodiment, the codebook may be in the form of a set of complex sequences, or it may be in the form of a complex sequence table (e.g., as shown in Table 1), or it may be in the form of a long complex sequence.

Table 1

index	1	2	3	4
					1	1+j	0	j	-1-j
2	-j	1	1-j	-1+j
					...	...	...	...	...
L	1-j	-1+j	1+j	0

In the preferred embodiment, the transmitter can also map every 2 data bits of its channel encoder output through a subset of the codebook into a complex sequence, in other words, the transmitter can pass every 2 data bits through the codebook. A part of the complex sequence is mapped to a complex sequence; wherein the subset information of the codebook may be preset by the system, or configured by the system by signaling, or determined by the transmitter according to a preset rule.

In the preferred embodiment, the length of the complex sequence in the codebook may also be S, and S is an integer greater than L, then the transmitter maps every 2 data bits output by its channel coder to the length through the codebook. The complex sequence of L may be implemented by mapping to a subsequence of a complex sequence of length S; wherein the system may be determined by a preset manner, or by a signaling configuration, or by a transmitter according to a preset rule. The way to obtain the subsequence information of the codebook.

In the preferred embodiment, the transmitter may also map each data bit of its channel encoder output, or every 3 data bits, or every 4 data bits, etc. through a codebook into a complex sequence; correspondingly, the system Or the transmitter may adjust the number of complex sequences included in the codebook as needed, or obtain the required codebook by a subset of the codebook, or a subsequence, or a combination.

In the preferred embodiment, the effect of interference randomization or averaging can be achieved when the transmitter maps different sets of data bits having the same value to different complex sequences through the codebook.

Preferred embodiment two

In the preferred embodiment, the transmitter can map every 2 data bits of its channel coder output through a codebook to a complex sequence of length L.

Moreover, different values of the two data bits correspond to different codebooks, wherein different values of the two data bits include 00, 01, 10, and 11 cases, and the four different values respectively correspond to different code values. The codebook is specifically: 00 corresponds to the codebook C ₀ , 01 corresponds to the codebook C ₁ , 10 corresponds to the codebook C ₂ , and 11 corresponds to the codebook C ₃ ; here, the different values of the two data bits correspond to each other. The different codebooks may be preset by the system, or the system is configured by signaling, or the transmitter is determined according to a preset rule (for example, the transmitter is independently generated);

Each codebook may include N complex sequences of length L (respectively denoted as L ₀ , L ₁ , . . . , L _N-1 ), where N is an integer greater than or equal to 1, and L is an integer greater than one. And, each element of each complex sequence of length L is a complex number, and the value of the real part and the imaginary part of each element comes from a set of ternary real numbers, that is, composed of [-1, 0, 1] set.

Assume that the data bits output by the transmitter channel encoder are: "0,0,1,0,0,1,1,1,0,1,1,0,1,1,0,0", which will be every 2 The data bits are treated as a data bit group: "00,10,01,11,01,10,11,00", then, specifically, the transmitter maps every 2 data bits of its channel encoder output through the codebook. The complex sequence of length L is:

6 is a schematic diagram of a transmitter mapping each k data bits through a codebook into a complex sequence of length L in accordance with a preferred embodiment of the present invention. As shown in FIG. 6, the transmitter determines, according to the correspondence relationship information of each of the two data bits and a complex sequence in the corresponding codebook, the length corresponding to each of the two data bits from the codebook corresponding to each of the two data bits. a complex sequence, and mapping every 2 data bits to a determined complex sequence of length L; the system can be configured in a preset manner or by signaling (eg semi-static configuration signaling or dynamic configuration signaling) And determining, by the transmitter, a correspondence between each of the two data bits and a complex sequence in its corresponding codebook in a manner determined by a predetermined rule (eg, random selection), for example: "00, 10, 01, 11, 01,10,11,00 'respectively codebook C ₀ is L _0, the codebook C ₂ L _0, the codebook C ₁ L _0, a codebook C ₃ L _0, C ₁ codebook in the L _1, the codebook C ₂ L _1, C ₃ codebook of L _1, the codebook C ₀ L ₁ in correspondence, then the transmitter may in accordance with the correspondence data bit from each 2 Determining, in the corresponding codebook, a complex sequence of length L corresponding to each of the two data bits, and mapping each of the two data bits to the determined correspondence The complex sequence of length L.

Alternatively, FIG. 7 is a schematic diagram of another transmitter for mapping every k data bits through a codebook into a complex sequence of length L in accordance with a preferred embodiment 2 of the present invention. As shown in FIG. 7, the transmitter determines, according to the sequence information or location information of each of the two data bits, a complex sequence of length L corresponding to each of the two data bits from the codebook corresponding to each of the two data bits, and Each 2 data bits are mapped to a determined complex sequence of length L. It is assumed that the number of complex sequences included in each codebook is greater than or equal to the number of data bit groups, since the order or position of every two data bits is: "0, 1, 2, 3, 4, 5, 6, 7 ", the transmitter is determined from each two bits of data corresponding to the present code according to the order or position of each two bits of data corresponding to a plurality of sequences as follows: C ₀ in codebook complex sequence of L _0, C ₂ codebook the complex sequence L _1, a complex sequence codebook _{C. 1} is L _2, a complex sequence in codebook C ₃ L _3, a complex sequence codebook _{C. 1} is L _4, the codebook C complex sequence in ₂ L ₅ , ₃ complex sequence codebook C L _6, a complex sequence of codebook C ₀ L _7, it can be seen, every 2 data bits corresponding to a plurality of positions in the respective order or sequence of codebook data with each of the two The order or position of the bits is the same, and then the transmitter maps every 2 data bits to the determined corresponding complex sequence of length L; or, for example, "00" for the first occurrence "00", the transmitter determines the corresponding codebook C0 complex sequence of L _0, to the second occurrence of the "00", the transmitter determines Sequences corresponding to a plurality of codebook C ₀ L _1, Similarly, the transmitter may determine whether each two bits of data corresponding to a complex sequence, then, the transmitter maps every two data bits corresponding to the determined length of A complex sequence of L.

Or the transmitter obtains sequence information or position information obtained from the order of each 2 data bits relative to the number of complex sequences in the corresponding codebook, and the codebook corresponding to each 2 data bits Determining a complex sequence of length L corresponding to every 2 data bits, and mapping every 2 data bits to the determined complex sequence of length L; assuming that the number of complex sequences included in each codebook is greater than or equal to The number of data bit groups, because the order or position of every 2 data bits is: "0, 1, 2, 3, 4, 5, 6, 7", then the order or position of every 2 data bits The order or position obtained by performing the remainder operation with respect to the number of complex sequences in its corresponding codebook is: 0 mod N = 0, 1 mod N = 1, 2 mod N = 2, 3 mod N = 3, 4 mod N = 4, 5 mod N=5, 6 mod N=6, 7 mod N=7, where mod represents the remainder operation, then the transmitter determines the correspondence corresponding to every 2 data bits from the codebook corresponding to every 2 data bits according to the order or position. complex sequence as follows: a complex sequence of codebook C ₀ L _0, C ₂ codebook The complex sequence L _1, a complex sequence codebook _{C. 1} is L _2, a complex sequence in codebook C ₃ L _3, a complex sequence codebook _{C. 1} is L _4, the codebook C complex sequence in ₂ L ₅ , a complex sequence in codebook C ₃ L _6, a complex sequence of codebook C _{0. 7} L, then, each transmitter 2 is mapped to the corresponding data bit length L is determined for a complex sequence; or to Taking "00" as an example, for the first occurrence of "00", the order information or position information obtained by performing the remainder operation with respect to the number N of the complex sequences in the codebook C ₀ corresponding to "00" is: (1) -1) mod N = 0, the transmitter determines the corresponding codebook a plurality of sequences C ₀ is L _0, to the second occurrence of the "00" with respect to "00" corresponding to the code C ₀ in the present If the order information or position information obtained by the remainder number operation is (2-1) mod N=1, the transmitter determines that the corresponding complex sequence is L ₁ in the codebook C _0. Similarly, The transmitter can determine a complex sequence corresponding to every 2 data bits, and then the transmitter maps each 2 data bits to the determined corresponding length L. Complex sequence.

Finally, the transmitter performs carrier modulation on the complex sequence obtained by the codebook mapping to form a transmitted signal and transmits it.

In the preferred embodiment, the number of complex sequences included in each codebook may be the same as the number of data bits, or may be different from the number of data bits.

In the preferred embodiment, the transmitter may further determine a complex sequence of length L corresponding to each of the two data bits from the codebook corresponding to each of the two data bits according to an odd or even position where every two data bits are located; For example, taking 2 data bits "00" and its corresponding codebook C ₀ as an example, suppose that the codebook C ₀ includes two complex sequences of length L (respectively denoted as L ₀ , L ₁ ), when "00 "At the even position, the transmitter determines that its corresponding complex sequence is L ₀ . When "00" is in the odd position, the transmitter determines that its corresponding complex sequence is L ₁ ; similarly, the transmitter can also be based on every 2 The odd or even position obtained by performing the remainder operation with respect to the position of the data bit relative to the number of complex sequences in its corresponding codebook determines the complex number corresponding to every 2 data bits from the codebook corresponding to each 2 data bits. sequence.

In the preferred embodiment, the effect of interference randomization or averaging can be achieved when the transmitter maps different sets of data bits having the same value to different complex sequences through the codebook.

Preferred embodiment three

In the preferred embodiment, the transmitter maps every 2 data bits of its channel encoder output through a codebook to a complex sequence of length L;

Moreover, each of the two data bits corresponds to one codebook, and each codebook includes N complex sequences of length L (respectively denoted as L ₀ , L ₁ , . . . , L _N-1 ), where N is greater than or An integer equal to 1, L is an integer greater than 1, each element of a complex sequence of length L is a complex number, and the real and imaginary parts of each element are derived from a set of ternary real numbers, ie by [ a set of -1, 0, 1]; a codebook corresponding to every 2 data bits may be preset by the system, or the system is configured by signaling, or the transmitter is determined according to a preset rule (for example: a transmitter) Independently generated);

Assume that the data bits output by the transmitter channel encoder are: "0,0,1,0,0,1,1,1,0,1,1,0,1,1,0,0", for every 2 The data bits are treated as a data bit group: "00,10,01,11,01,10,11,00", and a codebook corresponding to every 2 data bits is assumed to be: C ₀ , C ₁ , C ₂ , C ₃ , C ₄ , C ₅ , C ₆ , C ₇ , then, specifically, the transmitter maps every 2 data bits of its channel encoder output through the codebook to a complex sequence of length L:

8 is a schematic diagram of a transmitter mapping each k data bits through a codebook to a complex sequence of length L in accordance with a preferred embodiment of the present invention. As shown in FIG. 8, the transmitter determines, according to the index information represented by the value of each of the two data bits, a complex sequence of length L corresponding to each of the two data bits from the codebook corresponding to each of the two data bits, and each The two data bits are mapped to the determined complex sequence of length L; here it is further assumed that each codebook includes four complex sequences of length L (respectively denoted as L ₀ , L ₁ , L ₂ , L ₃ ), Since the value of every 2 data bits is: "0, 2, 1, 3, 1, 2, 3, 0", the transmitter uses the value of every 2 data bits as an index from every 2 data bits. the codebook is determined every 2 data bits corresponding to the length L of the plurality of sequences are: a complex sequence codebook C ₀ is a complex sequence of L _0, the codebook C ₁ is L _2, a codebook C ₂ complex sequence L _1, a complex sequence in codebook C ₃ L _3, a complex sequence of codebook _{C. 4} L _1, the codebook C ₅ is a complex sequence L _2, a complex sequence in codebook C ₆ L _3, the codebook C _{7 0} L complex sequence, then, the transmitter maps every two bits of data corresponding to the determined length L is the sequence of complex numbers.

Alternatively, FIG. 9 is a diagram showing another transmitter in accordance with a preferred embodiment 3 of the present invention mapping each k data bits through a codebook into a complex sequence of length L. As shown in FIG. 9, the transmitter determines, according to the difference between the two data bits and the correspondence information of the different complex sequences in the codebook corresponding to each of the two data bits, from the codebook corresponding to each of the two data bits. The data bits correspond to a complex sequence of length L, and map each 2 data bits into a determined complex sequence of length L; here it is further assumed that each codebook includes four complex sequences of length L (respectively Recorded as L ₀ , L ₁ , L ₂ , L ₃ ), since the different values of the two data bits include 00, 01, 10, and 11 cases, the four different values correspond to every 2 data bits. The correspondence between the four complex sequences in one codebook may be preset by the system, or configured by the system through signaling, or determined by the transmitter according to a preset rule, for example, in each codebook, 00 and complex sequences L ₀ corresponds, 01 corresponds to the complex sequence L ₁ , 11 corresponds to the complex sequence L ₂ , and 10 corresponds to the complex sequence L ₃ , then the transmitter determines from the codebook corresponding to every 2 data bits according to the correspondence relationship every 2 Complex sequence of length L corresponding to data bits Do is: a complex sequence codebook C ₀ is L _0, the codebook complex sequence of C ₁ L _3, the codebook complex sequence in the C ₂ L _1, a codebook C ₃ complex sequence of L _2, the codebook C ₄ complex sequence of L _1, a complex sequence of codebook C ₅ L _3, the codebook C complex sequence ₆ L _2, a codebook C ₇ complex sequence of L _0, then each two data transmitter The bit maps to the determined complex sequence of length L.

Alternatively, the transmitter determines, according to the correspondence relationship information of each of the two data bits and a complex sequence in the corresponding codebook, a complex sequence of length L corresponding to each of the two data bits from the codebook corresponding to each of the two data bits. And mapping every 2 data bits into the determined complex sequence of length L; the system can determine each 2 data by a preset manner, or a signaling configuration manner, or a manner determined by the transmitter according to a preset rule. The correspondence between a bit and a complex sequence in its corresponding codebook, for example: "00,10,01,11,01,10,11,00" and the complex sequence L ₀ and codebook C in the codebook C ₀ respectively complex sequence ₁ L _3, a complex sequence in the _second codebook C L _1, a complex sequence ₃ codebook C L _2, the codebook C complex sequence in ₄ L _1, the codebook C ₅ is a complex sequence L _3, the codebook C complex sequence of ₆ L _2, C plurality of codebook sequences correspond ₇ L _0, then the transmitter determines the correspondence information from each of two data bits corresponding to codebook according to each of 2 a data sequence corresponding to a complex sequence of length L, and mapping every 2 data bits to Corresponding to the predetermined length L complex sequence.

Finally, the transmitter performs carrier modulation on the complex sequence obtained by the codebook mapping to form a transmitted signal and transmits it.

In the preferred embodiment, the transmitter may also combine the sequence information or position information of every 2 data bits, or the order or position of every 2 data bits relative to the number of complex sequences in its corresponding codebook. Enter The sequence information or the position information obtained after the remainder operation is determined from the codebook corresponding to each of the two data bits, and the complex sequence corresponding to each of the two data bits is determined, and details are not described herein again.

In the preferred embodiment, the effect of interference randomization or averaging can be achieved when the transmitter maps different sets of data bits having the same value to different complex sequences through the codebook.

Preferred embodiment four

In the preferred embodiment, FIG. 10 is a schematic diagram of K transmitters performing data transmission and receiver performing interference cancellation SIC reception detection according to a preferred embodiment 4 of the present invention. As shown in FIG. 10, there are K transmitters in the system performing multiple access communication at the same time, and the system presets different codebooks for K transmitters by a preset manner, or the system is configured by signaling. The transmitters are configured with different codebooks, or the K transmitters determine different codebooks according to preset rules (for example, K transmitters independently generate different codebooks); wherein K is an integer greater than one.

The codebook of each transmitter may include N complex sequences of length greater than or equal to L, where N is an integer greater than or equal to 1, L is an integer greater than 1, and each element of each complex sequence is complex and each The real and imaginary parts of the elements are derived from the M-ary real number set, and M is an integer greater than or equal to 2.

The K transmitters respectively map the data bits output by the respective channel encoders into a complex sequence of length L by respective codebooks in groups of k data bits, and each element of the complex sequence of length L is The plural and the value of the real and imaginary parts of each element are derived from the set of M-ary real numbers, where k is an integer greater than or equal to one.

Then, the K transmitters perform carrier modulation (for example, OFDM-based multi-carrier modulation, etc.) on the complex sequence obtained by the codebook mapping on the same time-frequency resource, and form respective transmission signals, which are sent to the receiver.

The system receiver receives the signals transmitted by the K transmitters, and uses the serial interference cancellation SIC signal detector to receive and detect the received signals, and acquires data transmitted by the K transmitters.

Since the K transmitters form respective signals on the same time-frequency resource and transmit to the receiver, after receiving the multiple access wireless channel, the receiver receives the superposed signal of the signals transmitted by the K transmitters. .

When the system receiver uses the SIC signal detector to receive and detect the received signal, it needs to use the codebook applied to each transmitter to identify the signals transmitted by the K transmitters, including but not limited to: using the codebook of the specified transmitter to identify Specify the signal transmitted by the transmitter, or use the codebook of the K transmitters to identify the signals transmitted by each transmitter, or use all available codebooks of the system to identify the signals transmitted by each transmitter.

Based on the above preferred embodiment, in the actual application process, it can be applied to, but not limited to, the following systems or scenarios:

(1) MC-CDMA system;

For the MC-CDMA system, with the above preferred embodiment, the transmitter transmits each k data bits through a codebook to a complex sequence of length L, and multiple transmitters can respectively pass their respective data bits through their respective The codebook is mapped to a complex sequence and transmitted over the same time-frequency resource. After receiving the signals transmitted by multiple transmitters, the receiver uses the interference cancellation signal detector to receive and detect the signals transmitted by multiple transmitters; since multiple sequences with greater degrees of freedom are used, different transmitters can be effectively guaranteed. The low cross-correlation between the transmitted signals, the receiver using the interference cancellation signal detector can effectively distinguish the data transmitted by multiple transmitters using the same time-frequency resource. In addition, considering each k data bits as one data bit group, the transmitter can also perform interference randomization or averaging by mapping different data bit groups having the same value to different complex sequences through the codebook. Therefore, applying the above preferred embodiment to the MC-CDMA system can effectively control inter-user interference, and the receiver using the interference cancellation signal detector can effectively improve the multi-user access communication performance, thereby supporting higher System overload level, improving the experience of user non-orthogonal multiple access communication.

(2) a competitive access scenario;

For the contention access scenario, by using the above preferred embodiment, multiple or even a large number of user terminals can simultaneously request an access system, and a receiver using an interference cancellation signal detector can effectively distinguish signals transmitted by different access terminals. This can support higher system overload levels, effectively improve system access efficiency and improve terminal access experience.

(3) Free scheduling access scenario;

For the non-scheduled access scenario, the user terminal needs to transmit data on the available time-frequency resources when transmitting data, and multiple user terminals can simultaneously use the same time-frequency resource for data transmission. Combined with the receiver using the interference cancellation signal detector, the signals transmitted by each terminal can be effectively distinguished, thereby supporting a higher system overload level, improving the experience of scheduling access and communication of multiple user terminals, and reducing the system. Scheduling signaling to reduce terminal access delay.

11 is a block diagram showing the structure of a data transmission device according to an embodiment of the present invention. As shown in FIG. 11, the data transmission apparatus may include: a mapping module 10 configured to map a data bit group into a complex sequence by using a codebook, wherein each k data bits currently outputted are set as a data bit group, a complex sequence The length is L, all elements in the complex sequence are complex and the values of the real and imaginary parts of each element are derived from the M-ary real number set, k is an integer greater than or equal to 1, and L is an integer greater than 1. M is an integer greater than or equal to 2; the transmitting module 20 is configured to transmit the complex sequence.

The apparatus shown in FIG. 11 is used to solve the problem that the code division multiple access technology in the related art is usually based on a spread sequence of a binary pseudo-random real number sequence, which may cause serious multi-user interference, affecting multi-user reception detection performance and The problem of multi-user access communication performance, in turn, can effectively control inter-user interference and effectively improve multi-user access communication performance.

Preferably, the data bit group is set by every k data bits output by the transmitter's channel coder.

Preferably, the codebook may include N complex sequences of length greater than or equal to L, where N is an integer greater than or equal to 1, and all elements in each complex sequence are complex and the real and virtual of each element The values of the parts are all derived from the M-ary real number set.

Preferably, the above codebook may include 2 ^k complex sequences whose length is greater than or equal to L, wherein all elements in each complex sequence are complex numbers and the values of the real part and the imaginary part of each element are from M A collection of real numbers.

Preferably, the above-mentioned M-ary real number set may include one of the following:

(1) A set of M integers in the range [-(M-1)/2, (M-1)/2], where M is an odd number;

(2) A set of M odd numbers in the range [-(M-1), (M-1)], where M is an even number;

(3) A set of M real numbers obtained by multiplying M integers in the range [-(M-1)/2, (M-1)/2] by a corresponding normalization coefficient, where M is an odd number ;

(4) A set of M real numbers obtained by multiplying M odd numbers in the range [-(M-1), (M-1)] by a corresponding normalization coefficient, where M is an even number.

Preferably, as shown in FIG. 12, the mapping module 10 may include: a first obtaining unit 100 configured to acquire, from the codebook, a complex sequence of length L corresponding to each k data bits according to a preset rule, where The preset rules may include, but are not limited to, at least one of the following:

(1) index information represented by the value of each k data bits;

(2) correspondence information of different values of k data bits and different complex sequences in the codebook;

(3) correspondence information between each k data bits and a complex sequence in the codebook;

(4) Sequence information or position information in which each k data bits are located;

(5) Sequence information or position information obtained by performing a remainder operation with respect to the order or position of each k data bits relative to the number of complex sequences in the codebook;

(6) subset information or subsequence information of the codebook;

The first mapping unit 102 is arranged to map each k data bits into a complex sequence of length L.

Preferably, as shown in FIG. 12, the mapping module 10 may include: a second obtaining unit 104 configured to acquire a length corresponding to each k data bits from a codebook corresponding to each k data bits according to a preset rule. a complex sequence, wherein the different values of the k data bits correspond to different codebooks; the foregoing preset rules may include but are not limited to at least one of the following:

(1) correspondence information of a complex sequence of each k data bits and its corresponding codebook;

(2) Sequence information or position information in which each k data bits are located;

(3) order information or position information obtained by performing a remainder operation with respect to the order or position of each k data bits relative to the number of complex sequences in its corresponding codebook;

(4) subset information or sub-sequence information of each codebook corresponding to different values of k data bits;

(5) subset information or subsequence information of the codebook corresponding to each k data bits;

The second mapping unit 106 is arranged to map each k data bits into a complex sequence of length L.

Preferably, as shown in FIG. 12, the mapping module 10 may include: a third obtaining unit 108 configured to acquire a length corresponding to each k data bits from a codebook corresponding to each k data bits according to a preset rule. a complex sequence, where each k data bits corresponds to one codebook, and the foregoing preset rules may include but are not limited to at least one of the following:

(1) index information represented by the value of each k data bits;

(2) correspondence information of different values of k data bits and different complex sequences in a codebook corresponding to each k data bits;

(3) correspondence information of a complex sequence of each k data bits and its corresponding codebook;

(4) Sequence information or position information in which each k data bits are located;

(5) Sequence information or position information obtained by performing a remainder operation with respect to the order or position of each k data bits relative to the number of complex sequences in its corresponding codebook;

(6) subset information or subsequence information of the codebook corresponding to each k data bits;

The third mapping unit 110 is arranged to map each k data bits into a complex sequence of length L.

Preferably, as shown in FIG. 12, the sending module 20 may include: a generating unit 200 configured to perform carrier modulation on the complex sequence to generate a transmit signal, where the carrier modulation may be single carrier modulation or multi-carrier modulation; Set to transmit the transmitted signal.

FIG. 13 is a block diagram showing the structure of another data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 13, the data transmission apparatus may include: a receiving module 30 configured to receive signals transmitted by K transmitters, where K is an integer greater than or equal to 1, and each transmitter transmits a signal that is the transmitter Each of the transmitters is configured to perform carrier modulation on a complex sequence to which the data bits are mapped. Each transmitter sets each of the currently output data bits into a data bit group, and the length of the complex sequence is L, all in the complex sequence. The elements are all complex and the values of the real part and the imaginary part of each element are derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2; The obtaining module 40 is configured to acquire data sent by the K transmitters from the received signals according to the codebook.

Preferably, the interference cancellation signal detector of the receiver is used for receiving detection of the received signal, and acquiring data transmitted by the K transmitters.

Preferably, the signals transmitted by the K transmitters are the transmission signals respectively formed by the K transmitters on the same time-frequency resource.

Preferably, the codebooks applied by the K transmitters are different.

From the above description, it can be seen that the above embodiments achieve the following technical effects (it is required that the effects are achievable by some preferred embodiments): using the technical solutions provided by the embodiments of the present invention, each The k data bits are transmitted by the codebook mapping into a complex sequence of length L. When multiple transmitters respectively map the respective data bits to the complex sequence through the respective codebooks and transmit through the same time-frequency resource, Effectively ensuring low cross-correlation between signals transmitted by different transmitters; in addition, considering each k data bits as one data bit group, the transmitter can also map different data bit groups having the same value through the codebook to Different complex sequences are used to achieve interference randomization or averaging, so that multi-user interference can be effectively controlled. Combined with existing receivers using interference cancellation signal detectors, multi-user access communication performance can be effectively improved, and Support higher system overload levels and improve the user experience of non-orthogonal multiple access communication.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, the data transmission method and apparatus provided by the embodiments of the present invention have the following beneficial effects: the interference between multiple users can be effectively controlled, and the existing receiver using the interference cancellation signal detector can effectively improve more. Users access communication performance, which in turn can support higher system overload levels and improve the user experience of non-orthogonal multiple access communication.

Claims (26)

1. A data transmission method includes:

   Mapping a data bit group into a complex sequence by a codebook, wherein each k data bits of the current output are set to the data bit group, the complex sequence has a length L, and all elements in the complex sequence are The plural and the value of the real part and the imaginary part of each element are derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2;

   The complex sequence is transmitted.
2. The method of claim 1 wherein each k data bits currently output by a channel coder of the transmitter are set to the data bit group.
3. The method according to claim 1, wherein said codebook comprises N complex sequences of length greater than or equal to L, wherein N is an integer greater than or equal to 1, and all elements in each complex sequence are complex and The values of the real part and the imaginary part of each element are derived from the set of real numbers of the M-ary.
4. The method of claim 1 wherein said codebook comprises 2 ^k complex sequences of length greater than or equal to L, wherein all elements in each complex sequence are complex and the real and virtual of each element The values of the parts are all from the set of real numbers of the M-ary.
5. The method of claim 1 wherein said set of M-ary real numbers comprises one of:

   a set of M integers in the range [-(M-1)/2, (M-1)/2], where M is an odd number;

   a set of M odd numbers in the range [-(M-1), (M-1)], where M is an even number;

   a set of M real numbers obtained by multiplying M integers in the range [-(M-1)/2, (M-1)/2] by a corresponding normalization coefficient, where M is an odd number;

   A set of M real numbers obtained by multiplying M odd numbers in the range [-(M-1), (M-1)] by a corresponding normalization coefficient, where M is an even number.
6. The method of claim 1 wherein mapping the data bit group to the complex sequence by the codebook comprises:

   Obtaining, according to a preset rule, the complex sequence of length L corresponding to each k data bits from the codebook, wherein the preset rule includes at least one of: a value represented by each k data bits Index information, the correspondence between different values of k data bits and different complex sequences in the codebook Relationship information, correspondence information of each k data bits and a complex sequence in the codebook, sequence information or position information in which each k data bits are located, and the order or position of each k data bits is relative to Sequence information or position information obtained by performing remainder calculation in the number of complex sequences in the codebook, subset information or subsequence information of the codebook;

   The k-th data bits are mapped to the complex sequence of length L.
7. The method of claim 1 wherein mapping the data bit group to the complex sequence by the codebook comprises:

   Obtaining, according to a preset rule, the complex sequence of length L corresponding to the k-th data bit from a codebook corresponding to each k data bits, where different values of k data bits correspond to different codebooks The preset rule includes at least one of the following: correspondence information of a complex sequence of each k data bits and its corresponding codebook, sequence information or position information per k data bits, per k data Sequence information or position information obtained by calculating a sequence or position relative to a number of complex sequences in a corresponding codebook, and a subset of the codebooks corresponding to different values of k data bits or Subsequence information, subset information or subsequence information of a codebook corresponding to each k data bits;

   The k-th data bits are mapped to the complex sequence of length L.
8. The method of claim 1 wherein mapping the data bit group to the complex sequence by the codebook comprises:

   Obtaining, according to a preset rule, the complex sequence of length L corresponding to the k-th data bit from a codebook corresponding to each k data bits, where each k data bits corresponds to one codebook, the pre-predetermined The rule includes at least one of the following: index information represented by values of each k data bits, correspondence information of different values of k data bits and different complex sequences in a codebook corresponding to each k data bits, each Correspondence information of k data bits and a complex sequence in its corresponding codebook, sequence information or position information in which each k data bits are located, the order or position of each k data bits is relative to its corresponding code The sequence information or position information obtained by the remainder calculation in the number of complex sequences, the subset information or the sub-sequence information of the codebook corresponding to each k data bits;

   The k-th data bits are mapped to the complex sequence of length L.
9. The method of any one of claims 1 to 8, wherein transmitting the complex sequence comprises:

   Performing carrier modulation on the complex sequence to generate a transmit signal;

   Transmitting the transmitted signal.
10. A data transmission method includes:

    Receiving signals transmitted by K transmitters, where K is an integer greater than or equal to 1, and each transmitter transmits a signal formed by carrier-modulating a plurality of sequences whose data bits are mapped by a codebook. Each transmitter sets each k data bits of the current output to the data bit group, the length of the complex sequence is L, all elements in the complex sequence are complex numbers and the real part and each virtual element of each element The value of the part is derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2;

    Acquiring data transmitted by the K transmitters from the received signal according to the codebook.
11. The method according to claim 10, wherein the received signal is subjected to reception detection using an interference cancellation signal detector of the receiver to acquire data transmitted by the K transmitters.
12. The method of claim 10 wherein the signals transmitted by the K transmitters are transmitted signals respectively formed by the K transmitters on the same time-frequency resource.
13. The method of claim 10 wherein the codebooks applied by the K transmitters are different.
14. A data transmission device comprising:

    a mapping module, configured to map a data bit group into a complex sequence by using a codebook, wherein each k data bits of the current output are set to the data bit group, and the complex sequence has a length L, in the complex sequence All elements are complex and the values of the real and imaginary parts of each element are derived from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is greater than or equal to 2. Integer

    A sending module is configured to send the complex sequence.
15. The apparatus of claim 14, wherein each k data bits currently output by a channel coder of the transmitter is set to the data bit group.
16. The apparatus according to claim 14, wherein said codebook comprises N complex sequences of length greater than or equal to L, wherein N is an integer greater than or equal to 1, and all elements in each complex sequence are complex and The values of the real part and the imaginary part of each element are derived from the set of real numbers of the M-ary.
17. The apparatus of claim 14, wherein the codebook comprises 2 ^k complex sequences of length greater than or equal to L, wherein all elements in each complex sequence are complex and the real and virtual of each element The values of the parts are all from the set of real numbers of the M-ary.
18. The apparatus of claim 14, wherein the set of M-ary real numbers comprises one of:

    a set of M integers in the range [-(M-1)/2, (M-1)/2], where M is an odd number;

    a set of M odd numbers in the range [-(M-1), (M-1)], where M is an even number;

    a set of M real numbers obtained by multiplying M integers in the range [-(M-1)/2, (M-1)/2] by a corresponding normalization coefficient, where M is an odd number;

    A set of M real numbers obtained by multiplying M odd numbers in the range [-(M-1), (M-1)] by a corresponding normalization coefficient, where M is an even number.
19. The apparatus of claim 14, wherein the mapping module comprises:

    The first obtaining unit is configured to obtain, according to a preset rule, the complex sequence of length L corresponding to each k data bits from the codebook, where the preset rule includes at least one of the following: per k Index information represented by values of data bits, correspondence between different values of k data bits and different complex sequences in the codebook, per k data bits and a complex sequence of the codebook Correspondence information, order information or position information in which each k data bits are located, sequence information obtained in the order or position of each k data bits relative to the number of complex sequences in the codebook, or Location information, subset information or subsequence information of the codebook;

    A first mapping unit is arranged to map the k-th data bits to the complex sequence of length L.
20. The apparatus of claim 14, wherein the mapping module comprises:

    a second acquiring unit, configured to acquire, according to a preset rule, the complex sequence of length L corresponding to the k-th data bit from a codebook corresponding to each k data bits, where different k data bits The value corresponds to a different codebook; the preset rule includes at least one of the following: correspondence information of a complex sequence of each k data bits and its corresponding codebook, sequence information of each k data bits or Position information, sequence information or position information obtained by calculating the order or position of each k data bits relative to the number of complex sequences in the corresponding codebook, and each of the k data bits corresponding to each other Subset information or subsequence information of the codebook, subset information or subsequence information of the codebook corresponding to each k data bits;

    A second mapping unit is arranged to map the k-th data bits to the complex sequence of length L.
21. The apparatus of claim 14, wherein the mapping module comprises:

    a third acquiring unit, configured to acquire, according to a preset rule, the complex sequence of length L corresponding to the k-th data bit from a codebook corresponding to each k data bits, where each k data bits correspond to a codebook, the preset rule comprising at least one of: index information represented by a value of each k data bit, different values of k data bits and different complex numbers in a codebook corresponding to each k data bits The correspondence information of the sequence, the correspondence information of each complex sequence of k data bits and its corresponding codebook, the order information or position information of each k data bits, the order of each k data bits or The sequence information or the position information obtained by performing the remainder operation with respect to the number of the complex sequences in the corresponding codebook, the subset information or the sub-sequence information of the codebook corresponding to each k data bits;

    A third mapping unit is arranged to map the k-th data bits to the complex sequence of length L.
22. The apparatus according to any one of claims 14 to 21, wherein the transmitting module comprises:

    Generating unit, configured to perform carrier modulation on the complex sequence to generate a transmit signal;

    a transmitting unit configured to transmit the transmitted signal.
23. A data transmission device comprising:

    a receiving module, configured to receive signals transmitted by K transmitters, where K is an integer greater than or equal to 1, and each transmitter transmits a signal that is a complex sequence that the transmitter maps its data bits through the codebook Formed by carrier modulation, each transmitter sets each k data bits of the current output to the data bit group, the length of the complex sequence is L, all elements in the complex sequence are complex and each element The values of the real part and the imaginary part are both from the M-ary real number set, k is an integer greater than or equal to 1, L is an integer greater than 1, and M is an integer greater than or equal to 2;

    And an obtaining module, configured to acquire data sent by the K transmitters from the received signal according to the codebook.
24. The apparatus according to claim 23, wherein the received signal is subjected to reception detection using an interference cancellation signal detector of the receiver to acquire data transmitted by said K transmitters.
25. The apparatus of claim 23, wherein the signals transmitted by the K transmitters are transmitted signals respectively formed by the K transmitters on the same time-frequency resource.
26. The apparatus of claim 23 wherein the codebooks applied by the K transmitters are different.

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