CN115361093A - An adaptive signal transmission method, system and storage medium - Google Patents

Abstract

The invention discloses an adaptive signal transmission method, system and storage medium. The method includes: performing rate division processing on the user information at the base station side, superimposing and broadcasting the public signal and the private signal corresponding to each user end, and according to the target user end The feedback decoding signaling continues to broadcast the corresponding superimposed signal to the target user terminal and the relay at the same time; the relay decodes the superimposed signal broadcast on the base station side according to the decoding signaling, and forwards the decoded signal to the target user terminal; or according to Decoding the signaling performs signal amplification processing on the superimposed signal broadcast by the base station side, and forwards the amplified signal to the target user end. The invention realizes the adaptive relay cooperative transmission mode based on the short packet transmission and the rate division multiple access mechanism, supports the short packet access of a large number of devices on limited spectrum resources, and ensures the efficient transmission of device communication.

Description

An adaptive signal transmission method, system and storage medium

technical field

The present invention relates to the technical field of Internet of Things transmission, in particular to an adaptive signal transmission method, system and storage medium.

Background technique

Short packet transmission is one of the main characteristics of IoT transmission. The length of transmitted data packets generally contains hundreds to thousands of bits to meet the requirements of massive access and low latency.

Rate-splitting multiple access is a network candidate multiple access technology. Using rate-splitting technology, the information of multiple users is divided into public information and private information at the sending end (base station), and then the public information of multiple users is combined with private information. After the information is superimposed, the serial interference elimination is used to first decode the public information and then decode the respective private information. This technology has the potential to support massive access and meet the communication needs of equipment differentiation.

In the current research on cooperative rate division multiple access technology, there are the following two problems:

1. No relay protocol based on short packet transmission is designed, and the relay cooperation scheme is not adaptive;

2. Changes in channel status and device communication requirements are not considered, for example: whether the decoding of weak channel users can meet the change of their service quality requirements, whether the relay can decode the public information that needs to be forwarded to ensure the service quality requirements of weak channel users and The spectral efficiency requirements of the system.

Therefore, prior art still needs to be improved.

Contents of the invention

The technical problem to be solved by the present invention is that, aiming at the defects of the prior art, the present invention provides an adaptive signal transmission method, system and storage medium to solve the problem that the existing cooperative rate division multiple access technology cannot adapt to channel changes and device communication requirements. And realize the technical problem of adaptive rate division.

The technical solution adopted by the present invention to solve technical problems is as follows:

In the first aspect, the present invention provides an adaptive signal transmission method, the adaptive signal transmission method is applied to the base station side, including:

Obtain user information corresponding to each client, perform rate segmentation processing on the acquired user information, and obtain public signals and private signals corresponding to each user;

superimposing the public signal and the private signal corresponding to each user end, and broadcasting the corresponding superimposed signal to the relay and each user end;

Acquiring the decoding signaling fed back by the target user terminal, and continuing to simultaneously broadcast the corresponding superimposed signal to the target user terminal and the relay according to the fed back decoding signaling.

In an implementation manner, performing rate division processing on the obtained user information to obtain a public signal and a private signal corresponding to each user includes:

Divide each user information into corresponding public information and private information according to the preset division coefficient;

Merge all the divided public information, and encode the merged public information into a public signal according to the shared codebook;

Encode each piece of private information into a corresponding private signal according to the common codebook.

In an implementation manner, the superimposing the public signal and the private signal corresponding to each user terminal, and broadcasting the corresponding superimposed signal to the relay and each user terminal includes:

Allocating corresponding power to the public signal and each private signal according to a preset power allocation strategy;

Superimpose the public signal and the private signal of each user terminal, and broadcast the corresponding superimposed signal to the relay and each user terminal.

In an implementation manner, the broadcast superimposed signal is:

Among them, x is a broadcast signal;

s _c is a public signal;

p _c allocates power for public signals;

s _{i, p} is the private signal of user i;

p _i,p allocates power for user i's private signal.

In an implementation manner, the acquisition of the decoding signaling fed back by the target user end, and continuing to simultaneously broadcast the corresponding superimposed signal to the target user end and the relay according to the fed back decoding signaling includes:

Obtain decoding signaling fed back by the target client;

judging whether the target user terminal successfully decodes the corresponding superimposed signal according to the decoding signaling;

If yes, then continue to simultaneously broadcast the corresponding superimposed signal to the target user terminal and the relay;

If not, the base station side does not act, and sends the corresponding superimposed signal through relay cooperation.

In an implementation manner, it also includes:

determining signals received by the relay and each client;

calculating and obtaining a first signal-to-noise ratio corresponding to the public signal decoded by the relay and each user terminal according to the determined signal;

calculating and obtaining the second signal-to-noise ratio of the corresponding private signal decoded by each client according to the determined signal;

assigning a first rate for decoding the public signal to the relay and each user terminal according to the short packet transmission capacity algorithm and the first signal-to-noise ratio;

Allocating a second rate at which each user end decodes a corresponding private signal according to the short packet transmission capacity algorithm and the second SNR;

broadcasting a corresponding superimposed signal to the relay and each user end according to the first rate and the second rate.

In a second aspect, the present invention provides an adaptive signal transmission method, where the adaptive signal transmission method is applied to a relay, including:

Obtain the superimposed signal broadcast by the base station side and the decoded signaling fed back by the target user end;

Decoding the superimposed signal broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signal to the target user end;

Or perform signal amplification processing on the superimposed signal broadcast by the base station side according to the acquired decoded signaling, and forward the amplified signal to the target user terminal.

In an implementation manner, the decoding signaling is a successful decoding signaling or a failed decoding signaling fed back by the target user terminal according to a comparison result between the total rate obtained in the broadcasting stage and the target rate.

In an implementation manner, the decoding the superimposed signal broadcast on the base station side according to the obtained decoding signaling, and forwarding the decoded signal to the target user end includes:

judging whether the target user terminal successfully decodes the corresponding superimposed signal according to the decoding signaling;

If the target user terminal successfully decodes the corresponding superimposed signal, the superimposed signal broadcast by the base station side is not processed;

If the target user end fails to decode the corresponding superimposed signal, then judge whether the condition of cooperative decoding is satisfied;

If the condition of the cooperative decoding is satisfied, the public signal in the superimposed signal is decoded, and the decoded signal is forwarded to the target user terminal.

In an implementation manner, the decoding the public signal in the superimposed signal, and forwarding the decoded signal to the target user end includes:

calculating the signal-to-noise ratio of the received signal of the target user terminal and decoding the public signal;

calculating the total signal-to-noise ratio of the public signal decoded by the target user terminal by using the maximum ratio combining method;

Calculate and obtain the rate at which the target user terminal decodes the public signal during the entire communication process according to the short packet transmission capacity algorithm;

adding the rate at which the public signal is decoded during the entire communication process to the rate at which the private signal is decoded at the broadcast stage to obtain the final rate of the target client;

The signal is forwarded to the target user end according to the final rate of the target user end.

In an implementation manner, performing signal amplification processing on the superimposed signal broadcasted by the base station side according to the acquired decoding signaling, and forwarding the amplified signal to the target user end, includes:

If the condition of the cooperative decoding is not met, then according to the acquisition amplification and forwarding strategy;

Perform signal amplification processing on the superimposed signal broadcast by the base station side according to the amplification factor in the amplification and forwarding strategy, and forward the amplified signal to the target user terminal.

In an implementation manner, performing signal amplification processing on the superimposed signal broadcasted by the base station side according to the amplification factor in the amplification and forwarding strategy, and forwarding the amplified signal to the target user end includes:

calculating the signal and signal-to-noise ratio received by the target user terminal according to the amplification factor;

calculating the decoding rate and final rate of the public signal during the entire communication process according to the amplified signal-to-noise ratio;

The signal is forwarded to the target user end according to the final rate of the target user end.

In a third aspect, the present invention provides an adaptive signal transmission system, including: a base station side, a relay, and multiple user terminals;

The base station side is used to perform the following operations:

Obtain user information corresponding to each client, perform rate segmentation processing on the acquired user information, and obtain public signals and private signals corresponding to each user;

superimposing the public signal and the private signal corresponding to each user end, and broadcasting the corresponding superimposed signal to the relay and each user end;

Obtaining the decoding signaling fed back by the target user end, and continuing to simultaneously broadcast the corresponding superimposed signal to the target user end and the relay according to the fed back decoding signaling;

The relay is used to do the following:

Obtain the superimposed signal broadcast by the base station side and the decoded signaling fed back by the target user end;

Decoding the superimposed signal broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signal to the target user end;

Or perform signal amplification processing on the superimposed signal broadcast by the base station side according to the acquired decoded signaling, and forward the amplified signal to the target user terminal.

In a fourth aspect, the present invention also provides a storage medium, the storage medium is a computer-readable storage medium, and the storage medium stores an adaptive signal transmission program, and when the adaptive signal transmission program is executed by a processor, it is used to The adaptive signal transmission method as described in the first aspect is implemented.

The present invention adopts above-mentioned technical scheme to have following effect:

The present invention divides the rate of user information on the base station side, superimposes and broadcasts the public signal and the private signal corresponding to each user end, and continues to broadcast the corresponding signal to the target user end and the relay simultaneously according to the decoded signaling fed back by the target user end. Superimpose the signal; on the relay side, decode the superimposed signal broadcast on the base station side according to the decoding signaling, and forward the decoded signal to the target user end; or perform signal amplification processing on the superimposed signal broadcast on the base station side according to the decoding signaling, And forward the amplified signal to the target client. The present invention realizes adaptive relay cooperative transmission mode based on short packet transmission and rate division multiple access mechanism, supports short packet access of a large number of devices on limited spectrum resources, and at the same time ensures efficient transmission of device communication, solving existing problems The Cooperative Rate Division Multiple Access technology cannot achieve adaptive rate division according to channel changes and device communication requirements.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is a flowchart of a base station side of an adaptive signal transmission method in an implementation manner of the present invention.

Fig. 2 is a flow chart of the relay side of the adaptive signal transmission method in an implementation manner of the present invention.

Fig. 3 is a schematic diagram of base station-relay-user signaling interaction in an implementation manner of the present invention.

Fig. 4 is a functional schematic diagram of an adaptive signal transmission system in an implementation manner of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

exemplary method

In the current research on cooperative rate division multiple access technology, no relay protocol based on short-packet transmission is designed, and the relay cooperative scheme is not adaptive; moreover, changes in channel status and device communication requirements are not considered, for example: Whether the decoding of weak channel users can meet the change of their service quality requirements, and whether the relay can decode the public information that needs to be forwarded to ensure the service quality requirements of weak channel users and the spectrum efficiency requirements of the system.

In view of the above technical problems, an adaptive signal transmission method is provided in the embodiment of the present invention, which implements an adaptive relay cooperative transmission mode based on short packet transmission and rate division multiple access mechanism, and supports a large number of devices on limited spectrum resources Short packet access, while ensuring efficient transmission of device communication, solves the problem that the existing cooperative rate division multiple access technology cannot achieve adaptive rate division according to channel changes and device communication needs.

Example 1

As shown in Figure 1, this embodiment provides an adaptive signal transmission method, including the following steps:

In step S100, user information corresponding to each user terminal is obtained, and rate division processing is performed on the obtained user information to obtain a public signal and a private signal corresponding to each user.

In this embodiment, under the condition of short packet transmission, according to the channel state (that is, channel power gain) and device communication requirements (that is, rate requirement), and taking into account the decoding capabilities of the weak channel user end and relay, adaptively adjust the Following the cooperative strategy (i.e., relay decoding and forwarding or amplifying and forwarding or no action), improve the communication capability of devices under weak channel conditions; thus improve the rate of weak channel devices on limited spectrum resources, ensure their reliability, and then support more Short-packet access for multiple devices meets the communication needs of the next generation IoT with large connections and high spectrum efficiency.

Specifically, in an implementation manner of this embodiment, step S100 includes the following steps:

Step S101, dividing each user information into corresponding public information and private information according to a preset division factor;

Step S102, combining all the divided public information, and encoding the combined public information into a public signal according to the shared codebook;

Step S103: Encode each piece of private information into a corresponding private signal according to the shared codebook.

In this embodiment, as shown in Figure 4, in a communication scenario, the system includes: a base station, a dedicated relay and two user terminals (user 1 and user 2); of course, it can also be extended to multiple In the user scenario, each node is configured with a single antenna and works in half-duplex mode, and the base station cooperates through a dedicated relay to help user 1 and user 2 transmit information. The channels from the base station to the relay, user 1 and user 2 are denoted as h _r , h ₁ and h ₂ , and the channels from the relay to user 1 and user 2 are denoted as h _r1 and h _r2 . Wherein, user 1 is a strong channel user, and user 2 is a weak channel user, that is, |h ₁ | ² >|h ₂ | ² .

This embodiment is based on rate-division multiple-access technology, and proposes a rate-multiple-access transmission scheme based on short packet transmission, and designs an adaptive relay cooperation scheme. The entire communication process can be roughly divided into two stages. The first stage is based on rate-division multiple access. The broadcast stage of the address, the second stage is the cooperation stage. Wherein, the first stage is implemented by the base station side, and the second stage is implemented by the relay.

In the first stage, the base station uses the rate division technology to divide the information W _i of user i (i=1,2) into corresponding public information W _i,c and private information W _{i,p , and then divides the information W i,p} of the two users The public information is merged into W _c , and the division coefficients of public information for user 1 and user 2 are α ₁ and α ₂ (for example, the division coefficient can be set to 0.5, that is, both α ₁ and α ₂ are 0.5), and a common codebook is used (i.e. the codebook of W _c , coded by symbol mapping) encode the merged public information into the public signal s _c , and encode the respective private information into their respective private signals s _i,p (the private information also adopts the same encoding method).

As shown in FIG. 1, in an implementation manner of this embodiment, the adaptive signal transmission method further includes the following steps:

Step S200, superimpose the public signal and the private signal corresponding to each user terminal, and broadcast the corresponding superimposed signal to the relay and each user terminal.

In this embodiment, after the public signal _sc and the private signal s _i,p corresponding to each user end are obtained by encoding, the base station side superimposes _sc and s _i,p and broadcasts it to the relay and each user end; and, in the process of broadcasting signals at the base station side, different broadcast powers are allocated to different signals according to a power allocation strategy.

Specifically, in an implementation manner of this embodiment, step S200 includes the following steps:

Step S201, allocate corresponding power to the public signal and each private signal respectively according to a preset power allocation strategy;

Step S202, superimpose the public signal and the private signal of each user terminal, and broadcast the corresponding superimposed signal to the relay and each user terminal.

In this embodiment, the base station side superimposes _sc and s _{i,p and} broadcasts them. During the process of broadcasting superimposed signals on the base station side, the corresponding power can be assigned to the public signal and each private signal according to the preset power allocation strategy. ; Wherein, the preset power allocation strategy may be an average power allocation strategy, and _sc and s _i,p allocate power to p _c and p _i,p respectively; after allocating power, the signal broadcasted by the base station side is:

Among them, x is a broadcast signal;

s _c is a public signal;

p _c allocates power for public signals;

s _{i, p} is the private signal of user i;

p _i,p allocates power for user i's private signal.

An example of the rate division process on the base station side:

Suppose the information of user 1 and user 2 are respectively W ₁ =(a ₁ ,a ₂ ,a ₃ ,a ₄ )∈W ₁ ={0000,0001,...,1111} and W ₂ =(b ₁ , b ₂ ,b ₃ )∈W ₂ ={000,001,...,111}, W ₁ is divided into W _1,c =(a ₁ ,a ₂ ) and W _1,p =(a ₃ ,a ₄ ) , W ₂ is divided into W _2,c =(b ₁ ) and W _2,p =(b ₂ ,b ₃ ), and then W _1,c and W _2,c are combined into owned information W _c =(W _{1 ,c} ,W _2,c )=(a ₁ ,a ₂ ,b ₁ ), to obtain the superposition signal.

As shown in FIG. 1, in an implementation manner of this embodiment, the adaptive signal transmission method further includes the following steps:

Step S300, acquire the decoded signaling fed back by the target user terminal, and continue to simultaneously broadcast the corresponding superimposed signal to the target user terminal and the relay according to the fed back decoded signaling.

In this embodiment, after the base station side broadcasts the signal, each user end will receive the corresponding broadcast signal; after each user end receives the base station side broadcast signal, it will decode the corresponding broadcast signal, and the decoding result Set it as decoding signaling, and feed back the decoding signaling to the base station side and the relay; for the decoding signaling fed back by each user end, the base station side needs to obtain the decoding signaling fed back by the weak channel user end (ie, the target user end), and according to The decoding signaling fed back by the weak channel UE selects whether to send the signal through relay cooperation.

Specifically, in an implementation manner of this embodiment, step S300 includes the following steps:

Step S301, acquiring the decoding signaling fed back by the target user end;

Step S302, judging whether the target user end has successfully decoded the corresponding superimposed signal according to the decoding signaling;

Step S303, if yes, continue to simultaneously broadcast the corresponding superimposed signal to the target user terminal and the relay;

Step S304, if not, the base station side does not act, and transmits the corresponding superimposed signal through relay cooperation.

In this embodiment, the decoding signaling is the result of comparing the total rate and the target rate obtained by the weak channel user terminal according to the first stage, and the successful decoding signaling or failed decoding signaling fed back; wherein, the first stage of the weak channel The total rate of is the rate divided by the base station side, and the target rate is the rate configured in the communication protocol.

If in the process of broadcasting signals on the base station side, the total rate obtained by the weak channel user end is greater than or equal to half of the target rate, it means that the weak channel user end can decode the broadcast signal on the base station side. At this time, only through the base station broadcast. Satisfy the rate requirements of the weak channel user end, and the weak channel user end feedbacks that it can successfully decode the signaling to the base station and the relay, then the second stage does not require relay cooperation, the base station continues to broadcast and the relay remains silent; if the weak channel user end gets If the total rate is less than half of the target rate, the relay needs to cooperate to transmit the broadcast signal on the base station side.

Specifically, in an implementation of this embodiment, the base station divides the rate for each user end, including the following steps:

Step S401, determining the signal received by the relay and each client;

Step S402, calculating and obtaining a first signal-to-noise ratio corresponding to the public signal decoded by the relay and each user terminal according to the determined signal;

Step S403, calculating and obtaining the second signal-to-noise ratio of the corresponding private signal decoded by each client according to the determined signal;

Step S404, according to the short packet transmission capacity algorithm and the first signal-to-noise ratio, allocate the first rate for the relay and each user end to decode the public signal;

Step S405, according to the short packet transmission capacity algorithm and the second signal-to-noise ratio, allocate a second rate for each client to decode the corresponding private signal;

Step S406, broadcast the corresponding superimposed signal to the relay and each user terminal according to the first rate and the second rate.

In this embodiment, in the first stage, the signals received by the relay and the two users (user 1 and user 2) are:

Among them, h _j is the channel coefficient from the base station to the relay, user 1 and user 2;

n _j is the receiving noise of the relay, user 1 and user 2.

The signal-to-interference-noise ratio of the public signal decoded by the relay and the two users is:

The signal-to-interference-noise ratios of the two users decoding their respective private signals are:

Where N _j (j=r,1,2) is the received noise power of the relay and the two users. Using the existing short packet transmission theory, the capacity of the point-to-point system short packet transmission is:

表示高斯白噪声信道的信道差量，Q^-1(ε)表示

的反函数。根据短包传输容量公式，可得到中继和两用户解码公有信号的速率为：Among them, m is the packet length of information sent by the base station, ε is the tolerable packet error rate of the system, γ is the system capacity of point-to-point transmission with unlimited packet length,

Indicates the channel delta of the Gaussian white noise channel, Q ^-1 (ε) represents

inverse function of . According to the short packet transmission capacity formula, the rate at which the relay and two users can decode public signals can be obtained as:

In order to ensure that both users can successfully decode the public signal, the rate of decoding the public signal in the broadcast stage is limited by the minimum value of the two users decoding the public signal, namely:

分割成两部分，其中

分配给用户1而

分配给用户2。public rate

is divided into two parts, the

assigned to user 1 while

Assigned to User 2.

In addition, the rate at which user i decodes its own private signal is:

Finally, the total rate of user i in the first stage is obtained as:

In this embodiment, the base station side can determine the channel state according to the signal received by each user end, and according to the short packet transmission theory and the corresponding channel state, adaptively allocate the corresponding rate for each user end, so as to The relay broadcasts the corresponding superimposed signals to each user end, and completes the signal broadcasting process at the base station side in the first stage.

Example 2

As shown in Figure 2, this embodiment provides an adaptive signal transmission method, including the following steps:

Step S500, acquiring the superimposed signal broadcast by the base station side and the decoded signaling fed back by the target user end.

In this embodiment, according to the situation of the weak channel device decoding the signal, the decoding result is fed back to the base station and the relay node, and the relay node further judges the result of decoding its public information, and finally decides the cooperation of the second stage relay Transmission mode: Through this solution, based on the differentiated communication requirements between devices and channel state changes, higher spectrum utilization can be provided to meet the short-packet access of a large number of users, and realize the large connection and high spectral efficiency requirements of the Internet of Things.

In the second stage, the relay can adaptively adjust the transmission strategy to help user 2's information transmission according to the situation that user 2 decodes its own signal and the relay decodes the public signal _sc in the first stage. Specifically: the relay obtains the superimposed signal broadcasted by the base station side and the decoding signaling fed back by user 2, and decodes the superimposed signal broadcasted by the base station side according to the decoded signaling fed back by user 2, or performs signal amplification on the superimposed signal broadcasted by the base station side Processing, so as to realize the process of relay cooperation.

As shown in Figure 2, this embodiment provides an adaptive signal transmission method, which also includes the following steps:

Step S600: Decode the superimposed signal broadcast by the base station side according to the obtained decoding signaling, and forward the decoded signal to the target user terminal.

In this embodiment, the decoding signaling fed back by user 2 is: the successful decoding signaling or the failed decoding signaling fed back by user 2 according to the comparison result between the total rate obtained in the broadcasting stage and the target rate. The relay determines whether to perform decoding and forwarding or amplification and forwarding according to the decoding signaling.

Specifically, in an implementation manner of this embodiment, step S600 includes the following steps:

Step S601, judging whether the target user end has successfully decoded the corresponding superimposed signal according to the decoding signaling;

Step S602, if the target UE successfully decodes the corresponding superimposed signal, then do not process the superimposed signal broadcast by the base station side;

Step S603, if the target user end fails to decode the corresponding superimposed signal, then judge whether the condition of cooperative decoding is satisfied;

Step S604, if the condition of the cooperative decoding is met, decode the public signal in the superimposed signal, and forward the decoded signal to the target user terminal.

与第一阶段目标速率

其中

为用户2两阶段总的目标速率(具体根据用户1和用户2的应用场景需求，本实施例中可设为1bit/s)。In this example, user 2 compares the total rate obtained in the first stage

with the target rate of the first stage

in

is the total target rate of user 2 in the two phases (according to the application scenario requirements of user 1 and user 2, it can be set to 1 bit/s in this embodiment).

说明只通过基站广播就可以满足用户2的速率需求，用户2反馈其可以成功解码信令给基站和中继(用户2同时反馈信令给基站和中继)，则第二阶段不需要中继协作，基站继续广播而中继保持沉默，则两用户两阶段总速率为

if the conditions are met

It shows that the rate requirement of user 2 can be met only through the broadcasting of the base station, and user 2 feedbacks that it can successfully decode the signaling to the base station and the relay (user 2 feeds back the signaling to the base station and the relay at the same time), then the second stage does not need the relay Cooperation, the base station continues to broadcast while the relay remains silent, then the total rate of the two users in the two phases is

说明只通过基站广播无法满足用户2的速率需求，用户2反馈其解码失败信令给基站和中继，则中继需要在第二阶段协作用户2的信息传输。if the conditions are met

It shows that the rate requirement of user 2 cannot be met only through the base station broadcast, and user 2 feeds back its decoding failure signaling to the base station and the relay, and the relay needs to cooperate with user 2 in the second stage of information transmission.

中继首先判断其是否能成功解码公有信号s_c。Further, under the condition that relay cooperation is required

The relay first judges whether it can successfully decode the public signal s _c .

(

为中继解码公有信号速率，

为解码公有信号的目标速率，中继可以通过基站广播获得

)；说明中继可以成功解码公有信号，则第二阶段中继采用解码转发方案；如果满足条件

说明中继无法解码公有信号，则第二阶段中继采用放大转发方案。If the relay judges that it satisfies the condition

(

Decoding the public signaling rate for the relay,

In order to decode the target rate of the public signal, the relay can obtain the

); indicating that the relay can successfully decode the public signal, then the second-stage relay adopts the decoding and forwarding scheme; if the condition is met

It means that the relay cannot decode the public signal, so the relay in the second stage adopts the amplification and forwarding scheme.

Specifically, in an implementation manner of this embodiment, step S604 includes the following steps:

Step S604a, calculating the signal-to-noise ratio of the received signal of the target user terminal and decoding the public signal;

Step S604b, using the maximum ratio combining method to calculate the total signal-to-noise ratio of the public signal decoded by the target user end;

Step S604c, calculating the rate at which the target user terminal decodes the public signal during the entire communication process according to the short packet transmission capacity algorithm;

Step S604d, adding the rate of decoding the public signal in the whole communication process to the rate of decoding the private signal in the broadcast stage to obtain the final rate of the target client;

Step S604e, forwarding the signal to the target user terminal according to the final rate of the target user terminal.

In this embodiment, when the decoding and forwarding scheme is adopted, the relay broadcasts and forwards its decoded public signal _sc to two users (the relay adopts serial interference cancellation technology (SIC) to decode), and the signal forwarded by the relay for:

Where p _r is the transmission power of the relay, and the signals received by the two users are obtained as:

Then the SINR of the two users decoding the public signal in the second stage is:

The two users use the maximum ratio combination method (that is, the receiving end receives multiple signals, calculates the SINR of each signal separately, and then weights the combination) to add the two-stage received SINR to obtain the decoding and forwarding scheme for two users The total signal-to-interference-noise ratio of the decoded public signal is:

Therefore, using the theory of short packet transmission, the decoding rate of the public signal of the two users in the whole communication process is obtained as:

Considering the decoding and forwarding strategy, the relay also needs to decode the public signal in the first stage, and the final decoding rate of the public signal is the minimum value of the public signal decoded by the relay and the two users during the entire communication process:

Add the rate of decoding the public signal in two stages to the rate of decoding the private signal in the first stage, and the final rate of the two users is:

In this embodiment, the relay allocates according to the above-mentioned final rates of the two users, and forwards the decoded signal to each user end, thereby implementing the relay decoding and forwarding scheme.

As shown in Figure 2, this embodiment provides an adaptive signal transmission method, which also includes the following steps:

Step S700, performing signal amplification processing on the superimposed signal broadcasted by the base station side according to the obtained decoded signaling, and forwarding the amplified signal to the target user terminal.

说明中继无法解码公有信号，则第二阶段中继采用放大转发方案。In this embodiment, if the rate requirement of user 2 cannot be met through broadcasting by the base station, and user 2 feeds back its decoding failure signaling to the base station and the relay, the relay needs to cooperate with the information transmission of user 2 in the second stage; if the relay Judging that it satisfies the conditions

It means that the relay cannot decode the public signal, so the relay in the second stage adopts the amplification and forwarding scheme.

Specifically, in an implementation manner of this embodiment, step S700 includes the following steps:

Step S701, if the condition of the cooperative decoding is not satisfied, according to the acquisition amplification and forwarding strategy;

Step S702, performing signal amplification processing on the superimposed signal broadcast by the base station side according to the amplification factor in the amplification and forwarding strategy, and forwarding the amplified signal to the target user terminal.

In this embodiment, when using the amplification and forwarding scheme, the reason for adopting the amplification and forwarding strategy instead of the base station continuing to broadcast the superimposed signal is that the amplification and forwarding can improve the receiving signal-to-interference-noise ratio of user 2 compared with the base station broadcasting, which is beneficial to user 2 in the first Two-stage decoding; the relay amplification and forwarding coefficient using the amplification and forwarding strategy is:

Specifically, in an implementation manner of this embodiment, step S702 includes the following steps:

Step S702a, calculating the signal and signal-to-noise ratio received by the target user end according to the amplification factor;

Step S702b, calculating the decoding rate and the final rate of the public signal during the entire communication process according to the amplified signal-to-noise ratio;

Step S702c, forwarding the signal to the target user terminal according to the final rate of the target user terminal.

In this embodiment, the signal received by the two users in the second stage using the amplification and forwarding strategy is:

The SINR of the two users can be obtained as:

The two users use the maximum ratio combination method to add the two-stage receiving SINR, and the total SINR of the public signal decoded by the two users in the amplification and forwarding scheme is obtained as:

Then the two users can decode the public signal rate in the whole communication process as:

The decoding rate of the public signal is the minimum value of the two users decoding the public signal during the entire communication process:

The two-stage decoding rate of the public signal is added to the rate of the first-stage decoding private signal to obtain the two-user rate:

In this embodiment, the relay allocates according to the above-mentioned summed rates of the two users, and amplifies and forwards the signal to each user end, thereby realizing the relay amplification and forwarding scheme.

Combining the above two embodiments, in an application scenario, the interaction process of base station, relay and user signaling is as follows:

Step S1, the base station broadcasts the superimposed signal to the relay and two users (ie user 1 and user 2);

Step S2, user 2 judges whether it can be decoded; if yes, execute step S3; if no, execute step S5;

Step S3, user 2 feeds back the successful decoding signaling to the base station and the relay;

Step S4, the base station continues to broadcast the superimposed signal, and the relay does not process it;

Step S5, user 2 feeds back the decoding failure signaling to the base station and the relay;

Step S6, the relay judges whether it can be decoded; if yes, execute step S7; if no, execute step S8;

Step S7, relay decoding and forwarding;

In step S8, the relay adopts amplification and forwarding.

In the above interaction process, the base station adaptively allocates the rate according to the channel state of each user end, and in the state where the weak channel user cannot decode, the relay realizes adaptive cooperative transmission according to its own decoding ability, and performs decoding rate allocation or amplified rate allocation , so as to realize the relay decoding and forwarding scheme or the amplification and forwarding scheme.

Embodiments of the present invention achieve the following technical effects through the above technical solutions:

The embodiment of the present invention performs rate division processing on the base station side for user information, superimposes and broadcasts the public signal and the private signal corresponding to each user end, and continues to broadcast simultaneously to the target user end and the relay according to the decoded signaling fed back by the target user end Corresponding superimposed signal; on the relay side, decode the superimposed signal broadcast on the base station side according to the decoding signaling, and forward the decoded signal to the target user end; or perform signal amplification on the superimposed signal broadcast on the base station side according to the decoded signaling processing, and forward the amplified signal to the target client. In this embodiment, based on the short packet transmission and the rate division multiple access mechanism, the adaptive relay cooperative transmission mode is realized, and the short packet access of a large number of devices is supported on the limited spectrum resources, while ensuring the efficient transmission of device communication, which solves the problem of The existing cooperative rate division multiple access technology cannot realize adaptive rate division according to channel changes and device communication requirements.

exemplary device

As shown in Figure 4, based on the above embodiments, the present invention also provides an adaptive signal transmission system, including:

Base station side, relay and multiple user terminals;

The base station side is used to perform the following operations:

Obtain user information corresponding to each client, perform rate segmentation processing on the acquired user information, and obtain public signals and private signals corresponding to each user;

superimposing the public signal and the private signal corresponding to each user end, and broadcasting the corresponding superimposed signal to the relay and each user end;

Obtaining the decoding signaling fed back by the target user end, and continuing to simultaneously broadcast the corresponding superimposed signal to the target user end and the relay according to the fed back decoding signaling;

The relay is used to do the following:

Obtain the superimposed signal broadcast by the base station side and the decoded signaling fed back by the target user end;

Decoding the superimposed signal broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signal to the target user end;

Or perform signal amplification processing on the superimposed signal broadcast by the base station side according to the acquired decoded signaling, and forward the amplified signal to the target user terminal.

In one embodiment, a storage medium is provided, wherein the storage medium stores an adaptive signal transmission program, and the adaptive signal transmission program is used to implement the above adaptive signal transmission method when executed by a processor.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the computer programs can be stored in a non-volatile storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, any reference to memory, storage, database or other media used in the various embodiments provided by the present invention may include non-volatile and/or volatile memory.

To sum up, the present invention provides an adaptive signal transmission method, system, and storage medium. The method includes: performing rate division processing on the user information at the base station side, superimposing and broadcasting the public signal and the private signal corresponding to each user end, and according to The decoding signaling fed back by the target user end continues to broadcast the corresponding superimposed signal to the target user end and the relay at the same time; the relay decodes the superimposed signal broadcast by the base station side according to the decoding signaling, and forwards the decoded signal to the target user end ; or perform signal amplification processing on the superimposed signal broadcasted by the base station side according to the decoded signaling, and forward the amplified signal to the target user end. The invention realizes the adaptive relay cooperative transmission mode based on the short packet transmission and the rate division multiple access mechanism, supports the short packet access of a large number of devices on limited spectrum resources, and ensures the efficient transmission of device communication.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (14)

1. An adaptive signal transmission method, characterized in that, the adaptive signal transmission method is applied to the base station side, comprising: Obtain user information corresponding to each client, perform rate segmentation processing on the acquired user information, and obtain public signals and private signals corresponding to each user; superimposing the public signal and the private signal corresponding to each user end, and broadcasting the corresponding superimposed signal to the relay and each user end; Acquiring the decoding signaling fed back by the target user terminal, and continuing to simultaneously broadcast the corresponding superimposed signal to the target user terminal and the relay according to the fed back decoding signaling. 2. The adaptive signal transmission method according to claim 1, wherein the rate division processing is performed on the obtained user information to obtain public signals and private signals corresponding to each user, including: Divide each user information into corresponding public information and private information according to the preset division coefficient; Merge all the divided public information, and encode the merged public information into a public signal according to the shared codebook; Encode each piece of private information into a corresponding private signal according to the common codebook. 3. The adaptive signal transmission method according to claim 1, wherein said superimposing the public signal and the private signal corresponding to each user end, and broadcasting the corresponding superimposed signal to the relay and each user end includes : Allocating corresponding power to the public signal and each private signal according to a preset power allocation strategy; Superimpose the public signal and the private signal of each user terminal, and broadcast the corresponding superimposed signal to the relay and each user terminal. 4. The adaptive signal transmission method according to claim 1, wherein the broadcast superimposed signal is:

Among them, x is a broadcast signal; s _c is a public signal; p _c allocates power for public signals; s _{i, p} is the private signal of user i; p _i,p allocates power for user i's private signal. 5. The adaptive signal transmission method according to claim 1, wherein the acquisition of the decoded signaling fed back by the target user terminal continues to broadcast corresponding signals to the target user terminal and the relay simultaneously according to the fed back decoded signaling. superimposed signals, including: Obtain decoding signaling fed back by the target client; judging whether the target user terminal successfully decodes the corresponding superimposed signal according to the decoding signaling; If yes, then continue to simultaneously broadcast the corresponding superimposed signal to the target user terminal and the relay; If not, the base station side does not act, and sends the corresponding superimposed signal through relay cooperation. 6. The adaptive signal transmission method according to claim 1, further comprising: determining signals received by the relay and each client; calculating and obtaining a first signal-to-noise ratio corresponding to the public signal decoded by the relay and each user terminal according to the determined signal; calculating and obtaining the second signal-to-noise ratio of the corresponding private signal decoded by each client according to the determined signal; assigning a first rate for decoding the public signal to the relay and each user terminal according to the short packet transmission capacity algorithm and the first signal-to-noise ratio; Allocating a second rate at which each user end decodes a corresponding private signal according to the short packet transmission capacity algorithm and the second SNR; broadcasting a corresponding superimposed signal to the relay and each user end according to the first rate and the second rate. 7. An adaptive signal transmission method, characterized in that the adaptive signal transmission method is applied to a relay, comprising: Obtain the superimposed signal broadcast by the base station side and the decoded signaling fed back by the target user end; Decoding the superimposed signal broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signal to the target user end; Or perform signal amplification processing on the superimposed signal broadcast by the base station side according to the acquired decoded signaling, and forward the amplified signal to the target user terminal. 8. The adaptive signal transmission method according to claim 7, wherein the decoding signaling is the successful decoding signaling fed back by the target user end according to the comparison result of the total rate obtained in the broadcast stage and the target rate or fail to decode the signaling. 9. The adaptive signal transmission method according to claim 7, wherein the superimposed signal broadcast on the base station side is decoded according to the acquired decoding signaling, and the decoded signal is forwarded to the target Clients, including: judging whether the target user terminal successfully decodes the corresponding superimposed signal according to the decoding signaling; If the target user terminal successfully decodes the corresponding superimposed signal, the superimposed signal broadcast by the base station side is not processed; If the target user end fails to decode the corresponding superimposed signal, then judge whether the condition of cooperative decoding is satisfied; If the condition of the cooperative decoding is satisfied, the public signal in the superimposed signal is decoded, and the decoded signal is forwarded to the target user terminal. 10. The adaptive signal transmission method according to claim 9, wherein said decoding the public signal in the superimposed signal, and forwarding the decoded signal to the target user end comprises: calculating the signal-to-noise ratio of the received signal of the target user terminal and decoding the public signal; calculating the total signal-to-noise ratio of the public signal decoded by the target user terminal by using the maximum ratio combining method; Calculate and obtain the rate at which the target user terminal decodes the public signal during the entire communication process according to the short packet transmission capacity algorithm; adding the rate at which the public signal is decoded during the entire communication process to the rate at which the private signal is decoded at the broadcast stage to obtain the final rate of the target client; The signal is forwarded to the target user end according to the final rate of the target user end. 11. The adaptive signal transmission method according to claim 9, characterized in that, according to the obtained decoded signaling, the superimposed signal broadcast on the base station side is subjected to signal amplification processing, and the amplified signal is forwarded to the The target clients described above include: If the condition of the cooperative decoding is not met, then according to the acquisition amplification and forwarding strategy; Perform signal amplification processing on the superimposed signal broadcast by the base station side according to the amplification factor in the amplification and forwarding strategy, and forward the amplified signal to the target user terminal. 12. The adaptive signal transmission method according to claim 11, characterized in that, according to the amplification factor in the amplification and forwarding strategy, the superimposed signal broadcast on the base station side is subjected to signal amplification processing, and the amplified signal is forwarded To the target client, including: calculating the signal and signal-to-noise ratio received by the target user terminal according to the amplification factor; calculating the decoding rate and final rate of the public signal during the entire communication process according to the amplified signal-to-noise ratio; The signal is forwarded to the target user end according to the final rate of the target user end. 13. An adaptive signal transmission system, comprising: a base station side, a relay, and multiple user terminals; The base station side is used to perform the following operations: Obtain user information corresponding to each client, perform rate segmentation processing on the acquired user information, and obtain public signals and private signals corresponding to each user; superimposing the public signal and the private signal corresponding to each user end, and broadcasting the corresponding superimposed signal to the relay and each user end; Obtaining the decoding signaling fed back by the target user end, and continuing to simultaneously broadcast the corresponding superimposed signal to the target user end and the relay according to the fed back decoding signaling; The relay is used to do the following: Obtain the superimposed signal broadcast by the base station side and the decoded signaling fed back by the target user end; Decoding the superimposed signal broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signal to the target user end; Or perform signal amplification processing on the superimposed signal broadcast by the base station side according to the acquired decoded signaling, and forward the amplified signal to the target user terminal. 14. A storage medium, wherein the storage medium is a computer-readable storage medium, and the storage medium stores an adaptive signal transmission program, and when the adaptive signal transmission program is executed by a processor, it is used to implement the following: The adaptive signal transmission method according to any one of claims 1-6 or 7-12.

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