CN106160936B - A kind of multi-user information processing method and device - Google Patents

Abstract

The present invention provides a multi-user information processing method and device; the method includes: a transmitter performs bit operation on a first group of bit information to be sent and a second group of bit information to obtain a third group of bit information; wherein, the The bit number M1 of the first group of bit information is less than or equal to the bit number M2 of the second group of bit information; the transmitter processes the first group of bit information to obtain a first complex symbol, and the third group of bits Information processing obtains a second complex symbol; the transmitter adds the first complex symbol and the second complex symbol to obtain a superimposed symbol; the transmitter forms a transmission signal from the superimposed symbol and transmits it. The invention can solve the problem that when the multi-user information is superimposed and encoded in the transmitter, if the receiver uses a simple symbol-level SIC to demodulate the superimposed symbols, the demodulation performance will be greatly degraded.

Description

A kind of multi-user information processing method and device

technical field

The present invention relates to the field of communications, and in particular, to a method and a device for processing multi-user information.

Background technique

The principle of the non-orthogonal multiple access technology (None Orthogonal Multiple Access, referred to as NOMA) is that the transmitting side performs multi-user information superposition coding, and the receiving side uses Serial Interference Cancellation (Successive Interference Cancellation, referred to as SIC).

For example, performing superposition coding on the transmitting side of a broadcasting system refers to superimposing the information of multiple users together. Here, "superposition" is usually the direct addition in the power domain. The transmitter sends the superimposed information to multiple receivers simultaneously. Each receiver solves the information it needs. It should be noted that the superposition coding technology makes the information of each user transmitted on the "whole channel", so the information of each user interferes with each other during demodulation.

The non-orthogonal multiple access technology can usually be divided into two demodulation methods: the first one, each user demodulates with the interference of other users, which is relatively simple to implement, but the performance is detrimental. The second is to use interference cancellation technology, that is, multi-user detection technology. The following briefly describes the SIC process of two users as an example. The multi-user SIC process can easily be generalized by this: first demodulate the information of user A (demodulate the information of A with the interference of user B). Then, when demodulating the user B information, it is necessary to first subtract the A information demodulated before (the code block-level SIC needs to be reconstructed), and then demodulate the user B information. In this way, since the user B information can be free from interference, the performance can be greatly improved. Classic literature has proved that the use of superposition coding combined with block-level SIC technology can reach the limit of multi-user information capacity.

As shown in Figures 1 (1) to (3), it is a schematic diagram of superposition coding of QPSK (Quadrature Phase Shift Keying) symbols and 16QAM (Quadrature Amplitude Modulation) symbols. A QPSK symbol (such as Figure 1(1)) and a 16QAM symbol carrying bit information "1011" (shown in Figure 1(2)) are directly added in the power domain to obtain a superimposed symbol carrying bit information "001011" ( As shown in Figure 1(3)).

Similarly, as shown in Figures 2(1)-(3), in addition to the situation in Figure 1, it also includes another situation, that is, a QPSK symbol carrying bit information "10" (as shown in Figure 2(1) ) (shown) and a 16QAM symbol carrying bit information "0011" (shown in Figure 2(2)) are directly added in the power domain to obtain a symbol carrying bit information "100011" (shown in Figure 2(3)) . All possible superposition cases can obtain 64 constellation points shown in the constellation in Fig. 2(3).

It is easy to see from Figure 2(3) that the two symbols are directly added, and finally the constellation points obtained by combining all possible symbols do not have the Gray (Gray) mapping attribute (the bit information carried by the mapped adjacent constellation points only exists 1 bit is different, usually the performance of this modulation is the best), for example, "100011" and "001011" have two bits that are different.

If the terminal uses a simple symbol-level SIC to demodulate the superimposed symbols, its demodulation performance will be greatly degraded. Therefore, in order to ensure the performance, the terminal needs to use a complex code block-level SIC. However, the block-level SIC will cause high implementation complexity, power consumption and delay to the terminal, which are sometimes unacceptable to the terminal.

Hierarchical modulation can also be seen as a variant of superposition coding. Hierarchical modulation refers to the combination of high-priority bitstreams and low-priority bitstreams, which are then mapped into a constellation map. Although hierarchical modulation can also combine constellations with Gray mapping properties, it is inflexible to allocate different powers to different data streams by hierarchical modulation, and its implementation complexity is also high. Different power allocation for different data streams is a necessary means to achieve downlink multi-user channel capacity.

To sum up, the multi-user information in the related art is superimposed and encoded at the transmitter. Correspondingly, if the receiver uses a simple symbol-level SIC to demodulate the superimposed symbols, its demodulation performance will be greatly degraded.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a multi-user information processing method and a device thereof, so as to at least solve the problem that when the multi-user information is superimposed and encoded by the transmitter, if the receiver uses a simple symbol-level SIC to demodulate the superimposed symbols, its The demodulation performance will be degraded greatly.

In order to solve the above problems, the present invention provides a multi-user information processing method, including:

The transmitter performs bit operation on the first group of bit information to be sent and the second group of bit information to obtain a third group of bit information; wherein, the number of bits M1 of the first group of bit information is less than or equal to the second group of bit information. The number of bits M2;

The transmitter processes the first set of bit information to obtain a first complex symbol, and processes the third set of bit information to obtain a second complex symbol;

The transmitter adds the first complex symbol and the second complex symbol to obtain a superimposed symbol;

The transmitter transmits the superimposed symbols to form a transmit signal.

Optionally, the bit operation includes a bit XOR operation; the operation objects are all bits of the first group of bit information and M1 bits of the second group of bit information.

Optionally, the number of bits of the third group of bit information is M2, including two parts, one part is composed of the specific M1 bits in the second group of bit information and the M1 bits in the first group of bit information. The two bits are obtained by performing a bit operation, and the other part is obtained by keeping the bits other than the above-mentioned specific M1 bits in the second group of bit information unchanged.

Optionally, the specific M1 bits are bits that determine the quadrant where the constellation point is located in the mapping constellation map corresponding to the second group of bit information.

Optionally, the third group of bit information is the same as the second group of bit information, or the constellation symbols mapped by the third group of bit information and the second group of bit information are relative to the real axis of the constellation coordinate system, The imaginary axis or origin is in a symmetrical relationship.

Optionally, the transmitter processes the first set of bit information to obtain a first complex symbol, and processes the third set of bit information to obtain a second complex symbol comprising:

The transmitter modulates the first group of bit information to obtain a first modulation symbol; multiplies the first modulation symbol by a predetermined first power adjustment factor according to the allocated power to obtain a first complex symbol; The second modulation symbol is obtained after the third group of bit information is modulated; the second complex symbol is obtained by multiplying the second modulation symbol by a predetermined second power adjustment factor according to the allocated power.

Optionally, the modulation mode adopted for the first modulation symbol corresponding to the first complex symbol includes binary phase shift keying BPSK, quadrature phase shift keying QPSK, and quadrature amplitude modulation QAM.

Optionally, the modulation mode adopted by the second modulation symbol corresponding to the second complex symbol includes QPSK and QAM.

Optionally, the mapped constellations of all superimposed symbols have Gray mapping properties.

The present invention also provides a multi-user information processing device, which is arranged in the transmitter and includes:

an operation module, configured to perform bit operation on the first group of bit information to be sent and the second group of bit information to obtain a third group of bit information; wherein, the number of bits M1 of the first group of bit information is less than or equal to the second group of bit information The number of bits of bit information M2;

a modulation module, configured to process the first group of bit information to obtain a first complex symbol, and process the third group of bit information to obtain a second complex symbol;

a superposition module, for adding the first complex symbol and the second complex symbol to obtain a superimposed symbol;

A transmitting module, configured to transmit the superimposed symbols to form a transmit signal.

Optionally, the bit operation includes a bit XOR operation; the operation objects are all bits of the first group of bit information and M1 bits of the second group of bit information.

Optionally, the number of bits of the third group of bit information is M2, including two parts, one part is composed of the specific M1 bits in the second group of bit information and the M1 bits in the first group of bit information. The two bits are obtained by performing a bit operation, and the other part is obtained by keeping the bits other than the above-mentioned specific M1 bits in the second group of bit information unchanged.

Optionally, the specific M1 bits are bits that determine the quadrant where the constellation point is located in the mapping constellation map corresponding to the second group of bit information.

Optionally, the third group of bit information is the same as the second group of bit information, or the constellation symbols mapped by the third group of bit information and the second group of bit information are relative to the real axis of the constellation coordinate system, The imaginary axis or origin is in a symmetrical relationship.

Optionally, the modulation module processes the first group of bit information to obtain a first complex symbol, and processes the third group of bit information to obtain a second complex symbol means:

The modulation module modulates the first group of bit information to obtain a first modulation symbol; multiplies the first modulation symbol by a predetermined first power adjustment factor according to the allocated power to obtain a first complex symbol; The second modulation symbol is obtained after the third group of bit information is modulated; the second complex symbol is obtained by multiplying the second modulation symbol by a predetermined second power adjustment factor according to the allocated power.

Optionally, the modulation mode adopted for the first modulation symbol corresponding to the first complex symbol includes binary phase shift keying BPSK, quadrature phase shift keying QPSK, and quadrature amplitude modulation QAM.

Optionally, the modulation mode adopted by the second modulation symbol corresponding to the second complex symbol includes QPSK and QAM.

Optionally, the mapped constellations of all superimposed symbols have Gray mapping properties.

The advantages of the present invention are that the robustness of the receiver for symbol-level SIC can be enhanced through simple and unique design processing, that is, the access performance can be enhanced under the condition of a lower-complexity receiver.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1(1)～(3) is one of the schematic diagrams of superposition coding of QPSK symbols and 16QAM symbols;

2(1)-(3) are the second schematic diagrams of superimposed coding of QPSK symbols and 16QAM symbols;

3 is a schematic diagram of a process of processing multi-user information in a transmitter in Example 1;

FIG. 4 is a schematic diagram of constellation mapping of the first group of bit information in Example 1;

FIG. 5 is a schematic diagram of constellation mapping of the second group of bit information in Example 1;

6 is a schematic diagram of the formation of the third group of bit information under the first situation in Example 1;

Fig. 7 is the constellation mapping schematic diagram of the third bit information in the implementation example one;

8 is a schematic diagram of the formation of the third group of bit information under the second situation in Example 1;

Figures 9(1)-(3) are superimposed schematic diagrams of the first case in Example 1;

Figures 10(1)-(3) are superimposed schematic diagrams of the second situation in Example 1;

FIG. 11 is a comparison of the superposition results of the first and second situations in Example 1;

FIG. 12 is a schematic diagram of constellation mapping of the first group of bit information in Example 2;

13 is a schematic diagram of the constellation mapping of the second group of bit information in Example 2;

14 is a schematic diagram of the formation of the third group of bit information under the first situation in Example 2;

15 is a schematic diagram of the constellation mapping of the third group of bit information in Example 2;

16 is a schematic diagram of the formation of the third group of bit information under the second situation in Example 2;

17(1)-(3) are superimposed schematic diagrams of the first situation in the second implementation example;

Figures 18(1)-(3) are superimposed schematic diagrams of the second situation in Example 2;

FIG. 19 is a comparison of the superposition results of the first and second cases in the second implementation example.

Detailed ways

The technical solutions of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

It should be noted that, if there is no conflict, the embodiments of the present invention and various features in the embodiments can be combined with each other, which are all within the protection scope of the present invention. Additionally, although a logical order is shown in the flowchart, in some cases steps shown or described may be performed in an order different from that herein.

Embodiment 1, a multi-user information processing method, comprising:

The transmitter performs bit operation on the first group of bit information to be sent and the second group of bit information to obtain a third group of bit information; wherein, the number of bits M1 of the first group of bit information is less than or equal to the second group of bit information. The number of bits M2;

The transmitter processes the first set of bit information to obtain a first complex symbol, and processes the third set of bit information to obtain a second complex symbol;

The transmitter adds the first complex symbol and the second complex symbol to obtain a superimposed symbol;

The transmitter transmits the superimposed symbols to form a transmit signal.

Optionally, the bit operation includes a bit XOR operation; the operation objects are all bits of the first group of bit information and M1 bits in the second group of bit information.

Optionally, the number of bits of the third group of bit information is M2, including two parts, one part is composed of the specific M1 bits in the second group of bit information and the M1 bits in the first group of bit information. The other part is obtained by keeping the bits other than the above-mentioned specific M1 bits in the second group of bit information unchanged.

Optionally, the specific M1 bits are bits that determine the quadrant where the constellation point is located in the mapping constellation map corresponding to the second group of bit information.

Optionally, the third group of bit information is the same as the second group of bit information, or the constellation symbols mapped by the third group of bit information and the second group of bit information are relative to the real axis of the constellation coordinate system, The imaginary axis or origin is in a symmetrical relationship.

Optionally, the transmitter processes the first set of bit information to obtain a first complex symbol, and processes the third set of bit information to obtain a second complex symbol comprising:

The transmitter modulates the first group of bit information to obtain a first modulation symbol; multiplies the first modulation symbol by a predetermined first power adjustment factor according to the allocated power to obtain a first complex symbol; After the third group of bit information is modulated, a second modulation symbol is obtained; the second modulation symbol is multiplied by a predetermined second power adjustment factor according to the allocated power to obtain a second complex symbol; that is, the first complex symbol is a The allocated power is obtained by multiplying the first modulation symbol by a predetermined first power adjustment factor to obtain a modulation symbol with power; the second complex symbol is obtained by multiplying the second modulation symbol by the predetermined power according to the allocated power. The second power adjustment factor, the resulting modulated symbol with power.

Optionally, the modulation mode adopted for the first modulation symbol corresponding to the first complex symbol includes BPSK (Binary Phase Shift Keying), QPSK, and QAM.

Optionally, the modulation mode adopted by the second modulation symbol corresponding to the second complex symbol includes QPSK and QAM.

Optionally, the mapped constellations of all possible superimposed symbols have Gray mapping properties.

In a specific example of the method for processing multi-user information provided by the embodiment of the present invention, the XOR bit is obtained by XOR operation between specific M1 bits in the second group of bit information and all M1 bits in the first group of bit information, and the obtained XOR bit is obtained. Or the latter bit is combined with the bits other than the above-mentioned specific bits in the second group of bit information to obtain the third group of bit information, and the first and second complex symbols obtained by processing the first group of bit information and the third group of bit information are superimposed to obtain Superimpose symbols, and transmit the superimposed symbols to form a transmission signal. By adopting the embodiments of the present invention, the system receiver can obtain better SIC robustness, and enhance the access performance under the condition of a lower complexity receiver.

In order to emphasize the characteristics of the embodiments of the present invention, the following preferred typical examples are used to further illustrate the implementation of the embodiments of the present invention.

Implementation example one

After the multi-user information is processed by the transmitter, it is sent to two receivers at the same time. For example, the transmitter should simultaneously transmit the first set of bit information to the edge user receiver UE1, and transmit the second set of bit information to the central user for reception. machine UE2. These two sets of bit information are superimposed and sent out after being processed by the transmitter. Corresponding receivers UE1 and UE2 demodulate the information they need from the superimposed information received from the two sets of bit information. As shown in FIG. 3 , the multi-user information processing process in the transmitter is shown.

As shown in FIG. 3 , firstly, the UE1 bit information is encoded to obtain the first group of bit information, and the UE2 bit information is encoded to obtain the second group of bit information. In this embodiment, encoding is an optional step, and the application may not include the encoding step, that is, the first group of bit information can be directly set as UE1 bit information, and the second group of bit information can be directly set as UE2 bit information.

Then, the first group of bit information is directly modulated to obtain a modulation symbol with a certain power (ie: the first complex symbol), and the second group of bit information is first subjected to bit operation with the first group of bit information to obtain the third group of bit information, and then Modulated to obtain a modulation symbol with a certain power (ie: the second complex symbol), wherein the modulation of the first group of bit information can be based on the modulation method adopted by the existing standard, such as: BPSK, QPSK, QAM; the third group of bit information The modulation can adopt QPSK, QAM, etc.

The third group of bit information consists of two parts, one part is obtained by the operation of the specific M1 bits in the second group of bit information and the M1 bits in the first group of bit information, and the other part is divided by the second group of bit information. Bits other than the above specified bits are left unchanged. Both M1 and M2 are positive integers, and M2 is greater than or equal to M1. For example, the first group of bit information is "10", the second group of bit information is "1100", and the first two bits "11" are specific two bits. Then the obtained third group of bit information is "0100", in which the first two bits "01" are obtained from the exclusive OR of the first group of bit information "10" and the specific 2 bits "11" of the second group of bit information, and the last two bits are obtained. It is obtained by keeping the bits "00" other than the above-mentioned specific bits in the second group of bit information unchanged.

Finally, modulate "10" and "0100" respectively, multiply them by the corresponding power adjustment factors, and superimpose them to obtain superimposed symbols, and then form the superimposed symbols into transmit signals for transmission.

Implementation example two

The two sets of bits are processed by the transmitter and sent to the two user receivers. More specifically, first of all, the first group of bit information C1 is two bits, as shown in FIG. 4 , which represents the mapping of the two bits of C1 in the constellation diagram. For example, when C1 is “10”, it is mapped to the solid line in FIG. On the constellation point represented by the circle (other constellation points are represented by hollow circles). The second group of bit information C2 is four bits, as shown in FIG. 5 , which indicates the mapping of the four bits of C2 in the constellation diagram. For example, when C2 is “1101”, it is mapped to the constellation point represented by the solid circle in FIG. 5 . . The 16QAM constellation used here is the 16QAM constellation of the IEEE (Institute of Electrical and Electronics Engineers) 802.16e standard, and the first and third bits in the four bits are important bits, that is, the bits that determine the positive and negative of the I channel Q component , that is, the first bit "1" and the third bit "0" in "1101" are important bits.

Then, the first group of bit information C1 is directly modulated by QPSK to obtain a modulation symbol S1 with a certain power (ie: the first complex symbol), and the second group of bit information C2 is first obtained by bit operation with the first group of bit information C1 The third group of bit information C is then modulated by the 16QAM mode of the IEEE802.16e standard to obtain a modulation symbol S2 (ie, a second complex symbol) with a certain power.

“10”＝“00”，而另外两位比特(第二比特和第四比特)由第二组比特信息C2中除上述特定比特之外的比特“11”保持不变得到。The third group of bit information C consists of two parts, as shown in FIG. 6 , one part is obtained by the XOR operation between the specific two bits in the second group of bit information C2 and the two bits in the first group of bit information C1 , and the other part is obtained by keeping the bits other than the above-mentioned specific bits in the second group of bit information C2 unchanged. More specifically, the first group of bit information C1 in FIG. 6 is "10", and the second group of bit information C2 is "1101", wherein the first bit and the third bit "10" are specific 2 bits. Then the obtained third group of bit information C is "0101", wherein the first bit and the third bit are the first group of bit information C1 "10" and the second group of bit information C2 specific 2 bits "10" XOR obtained "00", represented as "10" in Figure 6

"10"="00", and the other two bits (the second bit and the fourth bit) are obtained by keeping the bits "11" other than the above-mentioned specific bits in the second group of bit information C2 unchanged.

As shown in FIG. 7 , it is the mapping of four bits of the third group of bit information C in the constellation diagram. Comparing the second bit information constellation mapping with the third set of bit information constellation mappings, it is easy to find that the constellation point has changed to a position symmetrical to the imaginary axis of the constellation. In another possible situation, as shown in Figure 8, let C1 be "00" and C2 be "1101", the third group of bit information C can be obtained as "1101", wherein the first bit "1" and the third The bit "0" is obtained by the exclusive OR of the first bit "1", the third bit "0" in C2 and the "00" of C1, and the second and fourth bits "11" are to keep the second and fourth bits in C2. The fourth bit is obtained unchanged; it is the same as C2, so the mapping in the constellation is the same.

After the complex symbols are obtained from the above two possible situations, they are superimposed to obtain the superimposed symbols. It is easy to understand that the QPSK modulation symbol has 4 possible constellation points in the constellation diagram, the 16QAM modulation symbol has 16 possible constellation points in the constellation diagram, and the superimposed symbol of two complex symbols has 64 possible constellation points in the constellation diagram. Possible constellation points, as superposition coding described in the technical background. Here we focus on the two cases described above: the first: C1 is "10", C2 is "1101"; the second: C1 is "00", C2 is "1101".

Figures 9(1) to (3) are schematic diagrams of superposition in the first case, Figure 9(1) is the constellation points of the first group of bit information in the first case, and Figure 9(2) is the second case in the first case For the constellation points of the group bit information and the third group bit information, Figure 9(3) shows the superimposed constellation points in the first case. Figures 10(1)-(3) are schematic diagrams of superposition in the second case, Figure 10(1) is the constellation points of the first group of bit information in the second case, and Figure 10(2) is the second case in the second case For the constellation points of the group bit information and the third group bit information, Figure 10(3) shows the superimposed constellation points in the second case.

The place marked in the figure is to randomly take two specific cases to illustrate, the first one: the QPSK symbol at "10" and the 16QAM symbol at "0101" are superimposed to obtain the symbol at "101101". The second: the QPSK symbol at "00" and the 16QAM symbol at "1101" are optimally superimposed to obtain the symbol at "001101". Putting the superimposed symbols obtained in these two cases into one constellation diagram, Figure 11 shows the superimposed symbol constellation diagram of the two symbols.

It is easy to see and infer from Figure 11 that the mapped constellations of all possible superimposed symbols have Gray mapping properties.

Finally, the superimposed symbols are formed into a transmitted signal and sent to the two user receivers.

It should be noted that, through the simple and unique design process of the embodiment of the present invention, even if the receiver misjudges the QPSK symbol S1 due to noise, the correct demodulation of the 16QAM symbol S2 is not affected. Therefore, the robustness of the receiver to perform symbol-level SIC is enhanced, that is, the access performance is enhanced under the condition of a lower-complexity receiver.

Implementation example three

The two sets of bits are processed by the transmitter and sent to the two user receivers. More specifically, first of all, the first group of bit information C1 is two bits, as shown in FIG. 12 , which represents the mapping of the two bits of C1 in the constellation diagram. For example, when C1 is “10”, it is mapped to the solid line in FIG. 12 . The circles represent the constellation points. The second group of bit information C2 is four bits, as shown in FIG. 13 , indicating the mapping of the four bits of C2 in the constellation diagram. For example, when C2 is “1011”, it is mapped to the constellation point represented by the solid circle in FIG. 13 . . The 16QAM constellation used here is the LTE standard 16QAM constellation, and the first and second bits in the four bits are important bits, that is, the bits that determine the positive and negative of the I channel Q component, that is, the first bit in "1011" "1" and the second "0" are important bits.

Then, the first group of bit information C1 is directly modulated by QPSK to obtain a modulation symbol S1 with a certain power (ie: the first complex symbol), and the second group of bit information C2 is first obtained by bit operation with the first group of bit information C1 The third group of bit information C is then modulated by the LTE standard 16QAM mode to obtain a modulation symbol S2 (ie: a second complex symbol) with a certain power.

“10”＝“00”，而另外两位比特由第二组比特信息C2中除上述特定比特之外的比特“11”保持不变得到。The third group of bit information C consists of two parts, as shown in Figure 14, one part is obtained by the XOR operation between the specific two bits in the second group of bit information C2 and the two bits in the first group of bit information C1 , and the other part is obtained by keeping the bits other than the above-mentioned specific bits in the second group of bit information C2 unchanged. More specifically, in FIG. 14 , the first group of bit information C1 is “10”, and the second group of bit information C2 is “1011”, wherein the first bit and the second bit “10” are specific 2 bits. Then the obtained third group of bit information C is "0011", wherein the first bit and the second bit are the first group of bit information C1 "10" and the second group of bit information C2 specific 2 bits "10" XOR obtained "00", represented as "10" in Figure 14

"10"="00", and the other two bits are obtained by keeping the bits "11" other than the above-mentioned specific bits in the second group of bit information C2 unchanged.

As shown in FIG. 15 , it is the mapping of four bits of the third group of bit information C in the constellation diagram. Comparing the second bit information constellation mapping with the third set of bit information constellation mappings, it is easy to find that the constellation point has changed to a position symmetrical to the imaginary axis of the constellation. Another possible situation, as shown in Figure 16, let C1 be "00" and C2 be "0011", the third group of bit information C can be obtained as "0011", in which the first bit "0" and the second bit are "0011". The bit "0" is obtained by the exclusive OR of the first bit "0" and the third bit "0" in C2 and "00" of C1, respectively. The third and fourth bits "11" are to keep the third and fourth bits in C2. The fourth bit is obtained unchanged; it is the same as C2, so the mapping in the constellation is the same.

After the complex symbols are obtained from the above two possible situations, they are superimposed to obtain the superimposed symbols. It is easy to understand that the QPSK modulation symbol has 4 possible constellation points in the constellation diagram, the 16QAM modulation symbol has 16 possible constellation points in the constellation diagram, and the superimposed symbol of two complex symbols has 64 possible constellation points in the constellation diagram. Possible constellation points, as superposition coding described in the technical background. Here we focus on the two cases described above: the first: C1 is "10", C2 is "1101"; the second: C1 is "00", C2 is "1101".

Figures 17(1) to (3) are schematic diagrams of superposition in the first case, Figure 17(1) is the constellation points of the first group of bit information in the first case, and Figure 17(2) is the second case in the first case For the constellation points of the group bit information and the third group bit information, Figure 17(3) shows the superimposed constellation points in the first case. Figures 18(1)-(3) are schematic diagrams of superposition in the second case, Figure 18(1) is the constellation points of the first group of bit information in the second case, and Figure 18(2) is the second case in the second case For the constellation points of the group bit information and the third group bit information, Figure 18(3) shows the superimposed constellation points in the second case.

The place marked in the figure is to randomly take two specific cases to illustrate, the first one: the QPSK symbol at "10" and the 16QAM symbol at "1011" are superimposed to obtain the symbol at "101011". The second: the QPSK symbol at "00" and the 16QAM symbol at "1011" are optimally superimposed to obtain the symbol at "001011". Putting the superimposed symbols obtained in these two cases into one constellation diagram, Figure 19 shows the superimposed symbol constellation diagram of two symbols.

It is easy to see and infer from Figure 19 that the mapped constellations of all possible superimposed symbols have Gray mapping properties.

Finally, the superimposed symbols are formed into a transmitted signal and sent to the two user receivers.

It should be noted that, compared with the case of direct superposition in FIG. 2 , the mapping constellations of all possible symbols of the superimposed symbols after the multi-user information processing in the embodiment of the present invention have Gray mapping properties. Moreover, more importantly, through the simple and unique design process of the embodiment of the present invention, even if the receiver misjudges the QPSK symbol due to noise, the correct demodulation of the 16QAM symbol is not affected. Therefore, the robustness of the receiver to perform symbol-level SIC is enhanced, that is, the access performance is enhanced under the condition of a lower-complexity receiver.

Embodiment 2, a multi-user information processing device, set in a transmitter, comprising:

an operation module, configured to perform bit operation on the first group of bit information to be sent and the second group of bit information to obtain a third group of bit information; wherein, the number of bits M1 of the first group of bit information is less than or equal to the second group of bit information The number of bits of bit information M2;

A modulation module, configured to modulate the first group of bit information to obtain a first complex symbol, and modulate the third group of bit information to obtain a second complex symbol;

a superposition module, for adding the first complex symbol and the second complex symbol to obtain a superimposed symbol;

A transmitting module, configured to transmit the superimposed symbols to form a transmit signal.

Optionally, the bit operation includes a bit XOR operation; the operation objects are all bits of the first group of bit information and M1 bits in the second group of bit information.

Optionally, the number of bits of the third group of bit information is M2, including two parts, one part is composed of the specific M1 bits in the second group of bit information and the M1 bits in the first group of bit information. The other part is obtained by keeping the bits other than the above-mentioned specific M1 bits in the second group of bit information unchanged.

Optionally, the specific M1 bits are bits that determine the quadrant where the constellation point is located in the mapping constellation map corresponding to the second group of bit information.

Optionally, the third group of bit information is the same as the second group of bit information, or the constellation symbols mapped by the third group of bit information and the second group of bit information are relative to the real axis of the constellation coordinate system, The imaginary axis or origin is in a symmetrical relationship.

Optionally, the modulation module, configured to obtain a first complex symbol after modulating the first group of bit information, and obtaining a second complex symbol after modulating the third group of bit information refers to:

The modulation module modulates the first group of bit information to obtain a first modulation symbol; multiplies the first modulation symbol by a predetermined first power adjustment factor according to the allocated power to obtain a first complex symbol; The second modulation symbol is obtained after the third group of bit information is modulated; the second complex symbol is obtained by multiplying the second modulation symbol by a predetermined second power adjustment factor according to the allocated power.

Optionally, the modulation mode adopted for the first modulation symbol corresponding to the first complex symbol includes binary phase shift keying BPSK, quadrature phase shift keying QPSK, and quadrature amplitude modulation QAM.

Optionally, the modulation mode adopted by the second modulation symbol corresponding to the second complex symbol includes QPSK and QAM.

Optionally, the mapped constellations of all possible superimposed symbols have Gray mapping properties.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk. Optionally, all or part of the steps in the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any particular form of combination of hardware and software.

Of course, the present invention can also have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the protection scope of the claims of the present invention.

Claims (14)

1. A multi-user information processing method, comprising: The transmitter performs bit operation on the first group of bit information to be sent and the second group of bit information to obtain a third group of bit information; wherein, the number of bits M1 of the first group of bit information is less than or equal to the second group of bit information. The number of bits M2; The transmitter processes the first set of bit information to obtain a first complex symbol, and processes the third set of bit information to obtain a second complex symbol; The transmitter adds the first complex symbol and the second complex symbol to obtain a superimposed symbol; The transmitter transmits the superimposed symbols to form a transmission signal; Wherein, the bit operation includes a bit XOR operation; the operation objects are all bits of the first group of bit information and M1 bits in the second group of bit information; The number of bits of the third group of bit information is M2, including two parts, one part is performed by the specific M1 bits in the second group of bit information and the M1 bits in the first group of bit information. It is obtained by bit operation, and the other part is obtained by keeping the bits other than the above-mentioned specific M1 bits in the second group of bit information unchanged. 2. The method of claim 1, wherein: The specific M1 bits are bits that determine the quadrant where the constellation point is located in the mapping constellation map corresponding to the second group of bit information. 3. The method of claim 1, wherein: The third group of bit information is the same as the second group of bit information, or the constellation symbols mapped by the third group of bit information and the second group of bit information are relative to the real axis, imaginary axis or origin of the constellation coordinate system Symmetrical relationship. 4. The method of claim 1, wherein the transmitter processes the first set of bit information to obtain a first complex symbol, and processes the third set of bit information to obtain a second complex symbol comprising: The transmitter modulates the first group of bit information to obtain a first modulation symbol; multiplies the first modulation symbol by a predetermined first power adjustment factor according to the allocated power to obtain a first complex symbol; The second modulation symbol is obtained after the third group of bit information is modulated; the second complex symbol is obtained by multiplying the second modulation symbol by a predetermined second power adjustment factor according to the allocated power. 5. The method of claim 1, wherein: The modulation modes used for the first modulation symbols corresponding to the first complex symbols include binary phase shift keying BPSK, quadrature phase shift keying QPSK, and quadrature amplitude modulation QAM. 6. The method of claim 1, wherein: The modulation modes adopted by the second modulation symbols corresponding to the second complex symbols include QPSK and QAM. 7. The method of claim 1, wherein: The mapped constellations of all superimposed symbols have Gray mapping properties. 8. A multi-user information processing device, arranged in a transmitter, characterized in that comprising: an operation module, configured to perform bit operation on the first group of bit information to be sent and the second group of bit information to obtain a third group of bit information; wherein, the number of bits M1 of the first group of bit information is less than or equal to the second group of bit information The number of bits of bit information M2; a modulation module, configured to process the first group of bit information to obtain a first complex symbol, and process the third group of bit information to obtain a second complex symbol; a superposition module, for adding the first complex symbol and the second complex symbol to obtain a superimposed symbol; a transmitting module, configured to transmit the superimposed symbols to form a transmit signal; Wherein, the bit operation includes a bit XOR operation; the operation objects are all bits of the first group of bit information and M1 bits in the second group of bit information; The number of bits of the third group of bit information is M2, including two parts, one part is performed by the specific M1 bits in the second group of bit information and the M1 bits in the first group of bit information. It is obtained by bit operation, and the other part is obtained by keeping the bits other than the above-mentioned specific M1 bits in the second group of bit information unchanged. 9. The device of claim 8, wherein: The specific M1 bits are bits that determine the quadrant where the constellation point is located in the mapping constellation map corresponding to the second group of bit information. 10. The apparatus of claim 8, wherein: The third group of bit information is the same as the second group of bit information, or the constellation symbols mapped by the third group of bit information and the second group of bit information are relative to the real axis, imaginary axis or origin of the constellation coordinate system Symmetrical relationship. 11. The apparatus according to claim 8, wherein the modulation module processes the first group of bit information to obtain the first complex symbol, and processes the third group of bit information to obtain the second complex symbol. : The modulation module modulates the first group of bit information to obtain a first modulation symbol; multiplies the first modulation symbol by a predetermined first power adjustment factor according to the allocated power to obtain a first complex symbol; The second modulation symbol is obtained after the third group of bit information is modulated; the second complex symbol is obtained by multiplying the second modulation symbol by a predetermined second power adjustment factor according to the allocated power. 12. The apparatus of claim 8, wherein: The modulation modes used for the first modulation symbols corresponding to the first complex symbols include binary phase shift keying BPSK, quadrature phase shift keying QPSK, and quadrature amplitude modulation QAM. 13. The apparatus of claim 8, wherein: The modulation modes adopted by the second modulation symbols corresponding to the second complex symbols include QPSK and QAM. 14. The apparatus of claim 8, wherein: The mapped constellations of all superimposed symbols have Gray mapping properties.

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