CN115361093A - Self-adaptive signal transmission method, system and storage medium - Google Patents
Self-adaptive signal transmission method, system and storage medium Download PDFInfo
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
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- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/265—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the quality of service QoS
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Abstract
The invention discloses a self-adaptive signal transmission method, a self-adaptive signal transmission system and a storage medium, wherein the method comprises the following steps: the base station side performs rate segmentation processing on the user information, performs superposition broadcasting on the public signals and the private signals corresponding to each user side, and continuously broadcasts the corresponding superposition signals to the target user side and the relay at the same time according to the decoding signaling fed back by the target user side; the relay decodes the superposed signals broadcast by the base station side according to the decoding signaling and forwards the decoded signals to a target user side; or the superposed signals broadcasted by the base station side are amplified according to the decoding signaling, and the amplified signals are forwarded to the target user side. The invention realizes a self-adaptive relay cooperative transmission mode based on a short packet transmission and rate division multiple access mechanism, supports short packet access of a large number of devices on limited frequency spectrum resources, and simultaneously ensures high-efficiency transmission of device communication.
Description
Technical Field
The invention relates to the technical field of transmission of the Internet of things, in particular to a self-adaptive signal transmission method, a self-adaptive signal transmission system and a storage medium.
Background
Short packet transmission is one of the main characteristics of internet of things transmission, and the length of a transmitted data packet generally comprises hundreds to thousands of bits so as to meet the requirements of massive access and low time delay.
The rate division multiple access is a network candidate multiple access technology, information of multiple users is divided into public information and private information at a sending end (base station) by using the rate division technology, then the public information of the multiple users is merged and transmitted in a superposition mode with the private information, after the users receive the superposed information, the public information is decoded by using serial interference elimination, then the private information of the users is decoded, and the technology has the potential of supporting mass access and meeting the requirements of equipment differentiated communication.
In the current research on cooperative rate division multiple access technology, the following two problems exist:
1. a relay protocol based on short packet transmission is not designed, and a relay cooperation scheme has no adaptivity;
2. channel state changes and device communication requirements changes are not considered, for example: whether the decoding of the weak channel user can meet the change of the service quality requirement of the weak channel user, and whether the relay can decode the public information to be forwarded so as to ensure the service quality requirement of the weak channel user and the spectrum efficiency requirement of the system.
Therefore, the prior art has yet to be improved.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, a system and a storage medium for adaptive signal transmission to solve the technical problem that the existing cooperative rate division multiple access technology cannot realize adaptive rate division according to channel variation and device communication requirements.
The technical scheme adopted by the invention for solving the technical problem is as follows:
in a first aspect, the present invention provides an adaptive signal transmission method, where the adaptive signal transmission method is applied to a base station side, and includes:
acquiring user information corresponding to each user side, and performing rate segmentation processing on the acquired user information to obtain a public signal and a private signal corresponding to each user;
superposing the public signals and the private signals corresponding to the user sides, and broadcasting the corresponding superposed signals to the relay and the user sides;
and acquiring the decoding signaling fed back by the target user side, and continuously broadcasting the corresponding superposed signals to the target user side and the relay at the same time according to the fed back decoding signaling.
In one implementation, the performing rate division processing on the obtained user information to obtain a public signal and a private signal corresponding to each user includes:
dividing each user information into corresponding public information and private information according to a preset division coefficient;
merging all the divided public information, and coding the merged public information into a public signal according to a common codebook;
and coding each private information into a corresponding private signal according to the common codebook.
In one implementation, the superimposing the public signal and the private signal corresponding to each user side, and broadcasting the corresponding superimposed signal to the relay and each user side includes:
distributing corresponding power to the public signal and each private signal according to a preset power distribution strategy;
and superposing the public signals and the private signals of the user sides, and broadcasting the corresponding superposed signals to the relay and the user sides.
In one implementation, the broadcast superimposed signal is:
wherein x is a broadcast signal;
s c is a public signal;
p c distributing power for the public signals;
s i,p a private signal for user i;
p i,p power is allocated for the private signal of user i.
In one implementation manner, the obtaining of the decoding signaling fed back by the target ue and continuing to broadcast the corresponding superimposed signal to the target ue and the relay simultaneously according to the decoding signaling fed back includes:
acquiring a decoding signaling fed back by the target user side;
judging whether the target user side successfully decodes the corresponding superposed signal or not according to the decoding signaling;
if yes, continuously broadcasting corresponding superposed signals to the target user side and the relay at the same time;
if not, the base station side does not act and transmits the corresponding superposed signal through relay cooperation.
In one implementation, the method further comprises:
determining signals received by the relay and each user terminal;
calculating to obtain 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 a second signal-to-noise ratio of the private signal corresponding to each user side decoding according to the determined signal;
distributing a first rate for decoding the public signal by the relay and each user terminal according to a short packet transmission capacity algorithm and the first signal-to-noise ratio;
distributing a second rate of decoding corresponding private signals of each user side according to a short packet transmission capacity algorithm and the second signal-to-noise ratio;
and broadcasting corresponding superposed signals to the relay and each user terminal according to the first rate and the second rate.
In a second aspect, the present invention provides an adaptive signal transmission method, which is applied to a relay, and includes:
acquiring a superposition signal broadcasted by a base station side and a decoding signaling fed back by a target user side;
decoding the superposed signals broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signals to the target user side;
or amplifying the superposed signal broadcasted by the base station side according to the acquired decoding signaling, and forwarding the amplified signal to the target user side.
In one implementation, the decoding signaling is a successful decoding signaling or a failed decoding signaling fed back by the target ue according to a comparison result between a total rate obtained in a broadcast phase and a target rate.
In one implementation manner, the decoding the superposed signal broadcast by the base station according to the obtained decoding signaling, and forwarding the decoded signal to the target ue includes:
judging whether the target user side successfully decodes the corresponding superposed signal or not according to the decoding signaling;
if the target user side successfully decodes the corresponding superposed signal, the superposed signal broadcasted by the base station side is not processed;
if the target user side fails to decode the corresponding superposed signal, judging whether the condition of cooperative decoding is met;
and if the condition of cooperative decoding is met, decoding the public signal in the superposed signals, and forwarding the decoded signal to the target user side.
In one implementation, the decoding a common signal in the superimposed signal and forwarding the decoded signal to the target ue includes:
calculating the signal-to-noise ratio of the received signal of the target user side and the public signal;
calculating to obtain the total signal-to-noise ratio of the target user side to decode the public signal by adopting a maximum ratio combining method;
calculating the rate of decoding the public signal of the target user side in the whole communication process according to a short packet transmission capacity algorithm;
adding the rate of decoding the public signals in the whole communication process and the rate of decoding the private signals in the broadcasting stage to obtain the final rate of the target user side;
and forwarding the signal to the target user side according to the final rate of the target user side.
In one implementation manner, the performing signal amplification processing on the superimposed signal broadcast by the base station according to the obtained decoding signaling, and forwarding the amplified signal to the target ue includes:
if the cooperative decoding condition is not met, an amplifying and forwarding strategy is obtained;
and performing signal amplification processing on the superposed signals broadcast by the base station side according to the amplification factor in the amplification forwarding strategy, and forwarding the amplified signals to the target user side.
In one implementation manner, the performing signal amplification processing on the superimposed signal broadcast by the base station according to an amplification factor in an amplification forwarding policy, and forwarding the amplified signal to the target ue includes:
calculating a signal received by the target user side and a signal-to-noise ratio according to the amplification factor;
calculating the rate and the final rate of decoding the public signal in the whole communication process according to the amplified signal-to-noise ratio;
and forwarding the signal to the target user side according to the final rate of the target user side.
In a third aspect, the present invention provides an adaptive signal transmission system, including: a base station side, a relay and a plurality of user terminals;
the base station side is used for executing the following operations:
acquiring user information corresponding to each user side, and performing rate segmentation processing on the acquired user information to obtain public signals and private signals corresponding to each user;
superposing the public signals and the private signals corresponding to the user sides, and broadcasting the corresponding superposed signals to the relay and the user sides;
acquiring a decoding signaling fed back by a target user side, and continuously broadcasting corresponding superposed signals to the target user side and a relay at the same time according to the fed back decoding signaling;
the relay is configured to:
acquiring a superposition signal broadcasted by a base station side and a decoding signaling fed back by a target user side;
decoding the superposed signals broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signals to the target user side;
or amplifying the superposed signal broadcasted by the base station side according to the acquired decoding signaling, and forwarding the amplified signal to the target user side.
In a fourth aspect, the present invention also provides a storage medium, which is a computer-readable storage medium, and the storage medium stores an adaptive signal transmission program, and the adaptive signal transmission program is used to implement the adaptive signal transmission method according to the first aspect when executed by a processor.
The invention adopts the technical scheme and has the following effects:
the invention carries out rate segmentation processing on user information at a base station side, carries out superposition broadcasting on public signals and private signals corresponding to each user side, and continuously broadcasts corresponding superposition signals to a target user side and a relay simultaneously according to decoding signaling fed back by the target user side; decoding the superposed signals broadcast by the base station side at the relay side according to the decoding signaling, and forwarding the decoded signals to a target user side; or the superposed signals broadcasted by the base station side are amplified according to the decoding signaling, and the amplified signals are forwarded to the target user side. The invention realizes an adaptive relay cooperative transmission mode based on a short packet transmission and rate division multiple access mechanism, supports short packet access of a large amount of equipment on limited spectrum resources, ensures high-efficiency transmission of equipment communication, and solves the problem that the existing cooperative rate division multiple access technology can not realize adaptive rate division according to channel change and equipment communication requirements.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a flow chart of a base station side of an adaptive signal transmission method in one implementation of the present invention.
Fig. 2 is a flow chart of a relay side of an adaptive signal transmission method in one implementation of the invention.
Fig. 3 is a schematic diagram of base station-relay-user signaling interaction in one implementation of the present invention.
Fig. 4 is a functional schematic diagram of an adaptive signaling system in one implementation of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Exemplary method
In the current research on cooperative rate division multiple access technology, a relay protocol based on short packet transmission is not designed, and then a relay cooperation scheme has no adaptivity; also, changes in channel conditions and changes in device communication requirements are not considered, such as: whether the decoding of the weak channel user can meet the change of the service quality requirement of the weak channel user, and whether the relay can decode the public information to be forwarded so as to ensure the service quality requirement of the weak channel user and the spectrum efficiency requirement of the system.
In view of the above technical problems, an embodiment of the present invention provides an adaptive signal transmission method, which implements an adaptive relay cooperative transmission mode based on short packet transmission and rate division multiple access mechanisms, supports short packet access of a large number of devices on limited spectrum resources, and simultaneously ensures efficient transmission of device communication, thereby solving the problem that the existing cooperative rate division multiple access technology cannot implement adaptive rate division according to channel changes and device communication requirements.
Example 1
As shown in fig. 1, the present embodiment provides an adaptive signal transmission method, which includes the following steps:
and step S100, acquiring user information corresponding to each user side, and performing rate segmentation processing on the acquired user information to obtain public signals and private signals corresponding to each user.
In this embodiment, under the condition of short packet transmission, the strategy of relay cooperation (i.e. relay decoding forwarding or amplifying forwarding or no action) is adaptively adjusted according to the channel state (i.e. channel power gain) and the device communication requirement (i.e. rate requirement) while considering the decoding capabilities of the weak channel user side and the relay, so as to improve the communication capability of the device under the condition of the weak channel; therefore, the rate of the weak channel equipment is increased on the limited spectrum resources, the reliability of the weak channel equipment is guaranteed, more equipment short packets are supported to be accessed, and the communication requirements of the next generation of internet of things for large connection and high spectrum efficiency are met.
Specifically, in one implementation manner of the present embodiment, the step S100 includes the following steps:
step S101, dividing each user information into corresponding public information and private information according to a preset division coefficient;
step S102, merging all the divided public information, and coding the merged public information into a public signal according to a common codebook;
and step S103, coding each private information into a corresponding private signal according to the common codebook.
In this embodiment, as shown in fig. 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, the method can also be extended to a multi-user scenario, each node is configured with a single antenna and operates in a half-duplex mode, and the base station assists information transmission of the user 1 and the user 2 through the cooperation of a proprietary relay. The channel from the base station to the relay, user 1 and user 2 is denoted h r 、h 1 And h 2 The channel relayed to user 1 and user 2 is denoted h r1 And h r2 . Wherein, user 1 is a strong channel user, and user 2 is a weak channel user, i.e. | h 1 | 2 >|h 2 | 2 。
The present embodiment provides a rate multiple access transmission scheme based on short packet transmission based on a rate division multiple access technology, and designs an adaptive relay cooperation scheme, where the whole communication process can be roughly divided into two stages, a first stage is a broadcast stage based on rate division multiple access, and a second stage is a cooperation stage. The first stage is a stage realized by a base station side, and the second stage is a stage realized by a relay.
In the first stage, the base station side adopts a rate division technology to divide the information W of the user i (i =1, 2) i Divided into respective corresponding public information W i,c And private information W i,p Then the public information of the two users is merged into W c The division coefficient of the common information to the user 1 and the user 2 is alpha 1 And alpha 2 (for example, the division coefficient may be set to 0.5, i.e., α 1 And alpha 2 All 0.5) and use a common codebook (i.e., W) c By symbol mapping) to encode the combined common information into a common signal s c Encoding the respective private information into a respective private signal s i,p (private information is also encoded in the same way as public information).
As shown in fig. 1, in an implementation manner of this embodiment, the adaptive signal transmission method further includes the following steps:
and step S200, overlapping the public signals and the private signals corresponding to the user sides, and broadcasting the corresponding overlapped signals to the relay and the user sides.
In this embodiment, the common signal s is obtained after encoding c And coding to obtain the private signal s corresponding to each user terminal i,p Then, the base station side will s c And s i,p The information is superposed and broadcast to the relay and each user side; and, in the course of broadcasting the signal in the base transceiver station side, distribute different broadcast power to different signals according to the power distribution tactics.
Specifically, in one implementation manner of the present embodiment, the step S200 includes the following steps:
step S201, distributing corresponding power to the public signal and each private signal according to a preset power distribution strategy;
and step S202, superposing the public signals and the private signals of each user side, and broadcasting corresponding superposed signals to the relay and each user side.
In this embodiment, the base station side will s c And s i,p The method comprises the steps of (1) overlapping and broadcasting, wherein in the process of broadcasting the overlapped signals at the base station side, corresponding power can be respectively distributed to public signals and each private signal according to a preset power distribution strategy; wherein the preset power allocation policy may be an average power allocation policy, s c And s i,p Allocated power of p respectively c And p i,p (ii) a After the power is distributed, the signals broadcasted by the base station side are:
wherein x is a broadcast signal;
s c is a public signal;
p c distributing power for the public signals;
s i,p to useA private signal of user i;
p i,p power is allocated for the private signal of user i.
The base station side rate splitting process is exemplified as follows:
suppose that the information of user 1 and user 2 is 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 ) Then W is added 1,c And W 2,c Merge into owned information W c ＝(W 1,c ,W 2,c )＝(a 1 ,a 2 ,b 1 ) And obtaining a superposed 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, the decoding signaling fed back by the target user terminal is obtained, and the corresponding superposed signals are continuously broadcasted to the target user terminal and the relay at the same time according to the fed back decoding signaling.
In this embodiment, after broadcasting signals at the base station side, each ue receives corresponding broadcast signals; after each user side receives the broadcast signal of the base station side, decoding the corresponding broadcast signal, setting the decoding result as a decoding signaling, and feeding back the decoding signaling to the base station side and the relay; for the decoding signaling fed back by each user terminal, the base station side needs to acquire the decoding signaling fed back by the weak channel user terminal (i.e. the target user terminal), and selects whether to cooperatively send a signal through the relay according to the decoding signaling fed back by the weak channel user terminal.
Specifically, in one implementation manner of the present embodiment, the step S300 includes the following steps:
step S301, obtaining the decoding signaling fed back by the target user terminal;
step S302, judging whether the target user side successfully decodes the corresponding superposed signal according to the decoding signaling;
step S303, if yes, continuing to broadcast corresponding superposed signals to the target user side and the relay at the same time;
in step S304, if not, the base station side does not operate and transmits the corresponding superimposed signal in relay cooperation.
In this embodiment, the decoding signaling is a successful decoding signaling or a failed decoding signaling fed back by the weak channel ue according to a comparison result between the total rate obtained in the first stage and the target rate; the total rate of the first stage of the weak channel is the rate segmented by the base station side, and the target rate is the rate configured in the communication protocol.
If the total rate obtained by the weak channel user side is greater than or equal to half of the target rate in the process of broadcasting signals by the base station side, the weak channel user side can decode the broadcasting signals of the base station side, at the moment, the rate requirement of the weak channel user side can be met only through base station broadcasting, the weak channel user side feeds back the successfully decoded signaling to the base station and the relay, the relay cooperation is not needed in the second stage, the base station continues broadcasting, and the relay keeps silent; if the total rate obtained by the weak channel user side is less than half of the target rate, the broadcast signal of the cooperative transmission base station side needs to be relayed.
Specifically, in an implementation manner of this embodiment, the rate division performed by the base station side for each ue includes the following steps:
step S401, determining signals received by the relay and each user terminal;
step S402, calculating to obtain 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 to obtain a second signal-to-noise ratio of the private signal corresponding to each user side decoding according to the determined signal;
step S404, distributing a first rate of decoding the public signal by the relay and each user terminal according to a short packet transmission capacity algorithm and the first signal-to-noise ratio;
step S405, distributing a second rate of decoding corresponding private signals of each user side according to a short packet transmission capacity algorithm and the second signal-to-noise ratio;
step S406, broadcasting the corresponding superimposed signals to the relay and each user terminal according to the first rate and the second rate.
In this embodiment, in the first phase, the signals received by the relay and the two users (user 1 and user 2) are:
wherein h is j Channel coefficients from the base station to the relay, user 1 and user 2;
n j the received noise of the relay, user 1 and user 2.
The signal-to-interference-and-noise ratio of the public signal decoded by the relay and the two users is as follows:
the signal-to-interference-and-noise ratios of private signals decoded by the two users are respectively as follows:
wherein N is j (j = r,1, 2) is the received noise power of the relay and two users, and by using the existing short packet transmission theory, the capacity of the short packet transmission of the point-to-point system is as follows:
wherein m is the packet length of information sent by the base station, epsilon is the packet error rate tolerable by the system, gamma is the system capacity of point-to-point transmission with infinite packet length,
delta channel, Q, representing a Gaussian white noise channel -1 (ε) represents
The inverse function of (c). According to the short packet transmission capacity formula, the rate of decoding the common signal by the relay and the two users is obtained as follows:
to ensure that both users can successfully decode the common signal, the rate of decoding the common signal during the broadcast phase is limited by the minimum value of the common signal that both users decode:
here the public rate
Is divided into two parts, wherein
Is assigned to user 1 and
to user 2.
In addition, the rate at which user i decodes the respective private signal is:
finally, the total rate of the user i in the first stage is obtained as follows:
in this embodiment, the base station side may determine the channel state of each ue according to the signal received by each ue, and adaptively allocate a corresponding rate to each ue according to the short packet transmission theory and the corresponding channel state, so as to broadcast a corresponding superimposed signal to the relay and each ue according to the allocated rate, thereby completing the signal broadcasting process of the base station side in the first stage.
Example 2
As shown in fig. 2, the present embodiment provides an adaptive signal transmission method, which includes the following steps:
step S500, acquiring the superimposed signal broadcasted by the base station side and the decoding signaling fed back by the target user side.
In this embodiment, according to the condition that the weak channel device decodes the signal, the decoding result is fed back to the base station and the relay node, and further the relay node judges the common information decoding result, and finally determines the cooperative transmission mode of the second-stage relay; through the scheme, higher spectrum utilization rate can be provided according to the differentiated communication requirements and channel state changes among the devices, short packet access of a large number of users is met, and the large connection and high spectrum efficiency requirements of the Internet of things are met.
In the second phase, the relay can decode the own signal and relay decode the common signal s according to the first phase user 2 c The base station and the relay adaptively adjust the transmission strategy to assist the information transmission of the user 2. The method specifically comprises the following steps: and the relay acquires the superposed signal broadcasted by the base station side and the decoding signaling fed back by the user 2, and decodes the superposed signal broadcasted by the base station side according to the decoding signaling fed back by the user 2, or performs signal amplification processing on the superposed signal broadcasted by the base station side, thereby realizing the process of relay cooperation.
As shown in fig. 2, the present embodiment provides an adaptive signal transmission method, further including the following steps:
step S600, decoding the superimposed signal broadcast by the base station side according to the obtained decoding signaling, and forwarding the decoded signal to the target user side.
In this embodiment, the decoding signaling fed back by the user 2 is: and the user 2 feeds back the successful decoding signaling or the failed decoding signaling according to the comparison result of the total rate and the target rate obtained in the broadcasting stage. The relay decides whether to perform decode-and-forward or amplify-and-forward according to the decoded signaling.
Specifically, in one implementation manner of this embodiment, the step S600 includes the following steps:
step S601, judging whether the target user side successfully decodes the corresponding superposed signal according to the decoding signaling;
step S602, if the target user end successfully decodes the corresponding superposed signal, the superposed signal broadcasted by the base station side is not processed;
step S603, if the target ue fails to decode the corresponding superposition signal, determining whether a cooperative decoding condition is satisfied;
step S604, if the condition of cooperative decoding is satisfied, decoding a common signal in the superimposed signal, and forwarding the decoded signal to the target user side.
In this embodiment, user 2 compares the total rate he or she obtained in the first stage
And the first stage target rate
Wherein
The total target rate is the two-stage total target rate of the user 2 (specifically, according to the application scene requirements of the user 1 and the user 2, the total target rate may be set to 1bit/s in this embodiment).
If the condition is satisfied
It is shown that the rate requirement of user 2 can be met only by base station broadcast, user 2 feeds back that it can successfully decode signaling to base station and relay (user 2 feeds back signaling to base station and relay at the same time), then the second stage does not need relay cooperation, base station continues broadcast and relay keeps silent, then it has dual purposesThe two-stage total rate of the house is
If the condition is satisfied
It is shown that the rate requirement of the user 2 cannot be met only by the base station broadcast, and the user 2 feeds back the decoding failure signaling to the base station and the relay, so that the relay needs to cooperate with the information transmission of the user 2 in the second stage.
Further, under the condition that relay cooperation is needed
The relay first determines whether it can successfully decode the public signal s c 。
If the relay judges that it satisfies the condition
(
To decode the common signal rate for the relay,
to decode the target rate of the common signal, the relay may obtain via base station broadcast
) (ii) a If the common signal can be successfully decoded by the relay, the second stage relay adopts a decoding and forwarding scheme; if the condition is satisfied
And if the common signal cannot be decoded by the relay, the second stage relay adopts an amplification forwarding scheme.
Specifically, in one 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 side and the decoded public signal;
step S604b, calculating by adopting a maximum ratio combining method to obtain the total signal-to-noise ratio of the public signal decoded by the target user side;
step S604c, calculating according to a short packet transmission capacity algorithm to obtain the rate of decoding the public signal of the target user side in the whole communication process;
step S604d, adding the rate of decoding the public signals and the rate of decoding the private signals in the broadcasting stage in the whole communication process to obtain the final rate of the target user side;
step S604e, forwarding the signal to the target ue according to the final rate of the target ue.
In this embodiment, when the decode-and-forward scheme is adopted, the public signal s for decoding is relayed c The broadcast is forwarded to two users (the relay decodes by adopting serial interference cancellation technology (SIC)), and the signal forwarded by the relay is:
wherein p is r For the transmission power of the relay, the received signals of the two users are obtained as follows:
then the signal to interference plus noise ratio of the public signal decoded by the two users in the second stage is:
the maximum ratio combining method is used by two users (namely, a receiving end receives multiple paths of signals, the signal to interference plus noise ratio of each path of signal is respectively calculated, then weighted combination is carried out), the two-stage received signal to interference plus noise ratios are added, and the total signal to interference plus noise ratio of the two users decoding common signals of the decoding forwarding scheme is obtained:
therefore, the decoding common signal rate of the two users in the whole communication process is obtained by using the short packet transmission theory as follows:
considering that the relay needs to decode the common signal in the first stage in the decoding and forwarding strategy, the rate of finally decoding the common signal is the minimum value of the common signal decoded by the relay and two users in the whole communication process:
adding the rate of the two-stage decoding public signal and the rate of the first-stage decoding private signal to obtain the final rates of two users as follows:
in this embodiment, the relay performs allocation according to the final rates of the two users, and forwards the decoded signal to each user side, thereby implementing a relay decoding and forwarding scheme.
As shown in fig. 2, the present embodiment provides an adaptive signal transmission method, further including the following steps:
step S700, performing signal amplification processing on the superimposed signal broadcast by the base station side according to the obtained decoding signaling, and forwarding the amplified signal to the target user side.
In this embodiment, if the rate requirement of the user 2 cannot be met through the base station broadcast, and the user 2 feeds back the decoding failure signaling to the base station and the relay, the relay needs to cooperate with the information transmission of the user 2 in the second stage; if the relay determines that it satisfies the barPiece
And if the common signal cannot be decoded by the relay, the second stage relay adopts an amplification forwarding scheme.
Specifically, in one implementation manner of the present embodiment, the step S700 includes the following steps:
step S701, if the cooperative decoding condition is not met, an amplification forwarding strategy is obtained;
step S702, performing signal amplification processing on the superimposed signal broadcast by the base station side according to the amplification factor in the amplification forwarding strategy, and forwarding the amplified signal to the target user side.
In this embodiment, when the amplify-and-forward scheme is adopted, the reason why the amplify-and-forward strategy is adopted instead of the base station continuing to broadcast the superimposed signal is that the amplify-and-forward strategy can improve the received signal-to-interference-and-noise ratio of the user 2 compared with the base station broadcast, which is beneficial to the user 2 to decode in the second stage; the relay amplification forwarding coefficient adopting the amplification forwarding strategy is as follows:
specifically, in one implementation manner of the present embodiment, the step S702 includes the following steps:
step S702a, calculating a signal received by the target user side and a signal-to-noise ratio according to the amplification factor;
step S702b, calculating the rate and the final rate of decoding the public signal in the whole communication process according to the amplified signal-to-noise ratio;
step S702c, forwarding the signal to the target ue according to the final rate of the target ue.
In this embodiment, the signals received by the two users in the second stage by adopting the amplification and forwarding strategy are:
the signal-to-interference-and-noise ratio of the two users can be obtained as follows:
the maximum ratio combining method is used by two users to add the received signal-to-interference-and-noise ratios in two stages, and the total signal-to-interference-and-noise ratio of the decoded common signals of the two users in the amplifying and forwarding scheme is obtained as follows:
and further obtaining the common decoding signal rates of the two users in the whole communication process as follows:
the rate of decoding the public signal is the minimum value of the two users in the whole communication process for decoding the public signal:
adding the rate of the two-stage decoding public signal and the rate of the first-stage decoding private signal to obtain two user rates:
in this embodiment, the relay performs allocation according to the above-mentioned added rate of the two users, and amplifies and forwards the signal to each user side, thereby implementing the relay amplification and forwarding scheme.
With the two embodiments, in an application scenario, the interaction process of the base station, the relay, and the user signaling is as follows:
step S1, a base station broadcasts a superposition signal to a relay and two users (namely user 1 and user 2);
s2, judging whether decoding is available or not by the user 2; if yes, executing step S3; if not, executing the step S5;
s3, the user 2 feeds back a decoding success signal to the base station and the relay;
s4, the base station continuously broadcasts the superposed signals, and the relay does not process the superposed signals;
step S5, the user 2 feeds back a decoding failure signaling to the base station and the relay;
s6, the relay judges whether the decoding is available; if yes, executing step S7; if not, executing step S8;
s7, relaying, decoding and forwarding;
and step S8, the relay adopts amplification forwarding.
In the interaction process, the base station adaptively allocates the rate according to the channel state of each user side, and in the state that the weak channel user cannot decode, the relay realizes adaptive cooperative transmission according to the decoding capability of the relay, and performs decoding rate allocation or amplification rate allocation, so as to realize a relay decoding forwarding scheme or an amplification forwarding scheme.
The embodiment of the invention achieves the following technical effects through the technical scheme:
the embodiment of the invention carries out rate segmentation processing on user information at a base station side, carries out superposition broadcasting on public signals and private signals corresponding to each user side, and continuously broadcasts corresponding superposition signals to the target user side and the relay at the same time according to a decoding signaling fed back by the target user side; decoding the superposed signals broadcast by the base station side at the relay side according to the decoding signaling, and forwarding the decoded signals to a target user side; or according to the decoding signaling, the superposed signal broadcasted by the base station side is amplified and transmitted to the target user side. In this embodiment, an adaptive relay cooperative transmission mode is implemented based on a short packet transmission and rate division multiple access mechanism, short packet access of a large number of devices is supported on limited spectrum resources, efficient transmission of device communication is guaranteed, and the problem that adaptive rate division cannot be implemented according to channel changes and device communication requirements in the conventional cooperative rate division multiple access technology is solved.
Exemplary device
As shown in fig. 4, based on the foregoing embodiments, the present invention further provides an adaptive signal transmission system, including:
a base station side, a relay and a plurality of user terminals;
the base station side is used for executing the following operations:
acquiring user information corresponding to each user side, and performing rate segmentation processing on the acquired user information to obtain public signals and private signals corresponding to each user;
superposing the public signals and the private signals corresponding to the user sides, and broadcasting the corresponding superposed signals to the relay and the user sides;
acquiring a decoding signaling fed back by a target user side, and continuously broadcasting corresponding superposed signals to the target user side and a relay at the same time according to the fed back decoding signaling;
the relay is configured to:
acquiring a superposition signal broadcasted by a base station side and a decoding signaling fed back by a target user side;
decoding the superposed signals broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signals to the target user side;
or according to the acquired decoding signaling, the superposed signals broadcast by the base station side are subjected to signal amplification processing, and the amplified signals are forwarded to the target user side.
In one embodiment, a storage medium is provided, wherein the storage medium stores an adaptive signal transmission program, which when executed by a processor is used to implement the adaptive signal transmission method as above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by instructing relevant hardware by a computer program, and the computer program may be stored in a non-volatile storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory.
In summary, the present invention provides a method, a system and a storage medium for adaptive signal transmission, wherein the method comprises: the base station side performs rate segmentation processing on the user information, performs superposition broadcasting on the public signals and the private signals corresponding to each user side, and continuously broadcasts the corresponding superposition signals to the target user side and the relay at the same time according to the decoding signaling fed back by the target user side; the relay decodes the superposed signal broadcasted by the base station side according to the decoding signaling and forwards the decoded signal to a target user side; or according to the decoding signaling, the superposed signal broadcasted by the base station side is amplified and transmitted to the target user side. The invention realizes a self-adaptive relay cooperative transmission mode based on short packet transmission and a rate division multiple access mechanism, supports short packet access of a large number of devices on limited frequency spectrum resources, and simultaneously ensures high-efficiency transmission of device communication.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (14)
1. An adaptive signal transmission method, applied to a base station side, includes:
acquiring user information corresponding to each user side, and performing rate segmentation processing on the acquired user information to obtain a public signal and a private signal corresponding to each user;
superposing the public signals and the private signals corresponding to the user sides, and broadcasting the corresponding superposed signals to the relay and the user sides;
and acquiring the decoding signaling fed back by the target user side, and continuously broadcasting the corresponding superposed signals to the target user side and the relay at the same time according to the fed back decoding signaling.
2. The adaptive signal transmission method according to claim 1, wherein the performing rate division processing on the obtained user information to obtain a public signal and a private signal corresponding to each user includes:
dividing each user information into corresponding public information and private information according to a preset division coefficient;
merging all the divided public information, and coding the merged public information into a public signal according to a common codebook;
and coding each private information into a corresponding private signal according to the common codebook.
3. The adaptive signal transmission method according to claim 1, wherein 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 comprises:
distributing corresponding power to the public signal and each private signal according to a preset power distribution strategy;
and superposing the public signal and each user side private signal, and broadcasting the corresponding superposed signals to the relay and each user side.
4. The adaptive signal transmission method according to claim 1, wherein the broadcast superimposed signal is:
wherein x is a broadcast signal;
s c is a public signal;
p c distributing power for public signals;
s i,p a private signal for user i;
p i,p private signal distribution for user iAnd (4) distributing power.
5. The adaptive signal transmission method according to claim 1, wherein the obtaining of the decoding signaling fed back by the target ue and continuing to broadcast the corresponding superimposed signal to the target ue and the relay simultaneously according to the fed back decoding signaling comprises:
acquiring a decoding signaling fed back by the target user side;
judging whether the target user side successfully decodes the corresponding superposed signals according to the decoding signaling;
if yes, continuously broadcasting corresponding superposed signals to the target user side and the relay at the same time;
if not, the base station side does not act and transmits the corresponding superposed signal through relay cooperation.
6. The adaptive signal transmission method according to claim 1, further comprising:
determining signals received by the relay and each user terminal;
calculating to obtain 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 a second signal-to-noise ratio of the private signal corresponding to each user side decoding according to the determined signal;
distributing a first rate for decoding the public signal by the relay and each user terminal according to a short packet transmission capacity algorithm and the first signal-to-noise ratio;
distributing a second rate of decoding corresponding private signals of each user side according to a short packet transmission capacity algorithm and the second signal-to-noise ratio;
and broadcasting corresponding superposed signals to the relay and each user terminal according to the first rate and the second rate.
7. An adaptive signal transmission method, applied to a relay, includes:
acquiring a superposition signal broadcasted by a base station side and a decoding signaling fed back by a target user side;
decoding the superposed signals broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signals to the target user side;
or amplifying the superposed signal broadcasted by the base station side according to the acquired decoding signaling, and forwarding the amplified signal to the target user side.
8. The adaptive signal transmission method according to claim 7, wherein the decoding signaling is a successful decoding signaling or a failed decoding signaling fed back by the target ue according to a comparison result between a total rate obtained in a broadcast phase and a target rate.
9. The adaptive signal transmission method according to claim 7, wherein the decoding the superimposed signal broadcasted by the base station side according to the obtained decoding signaling, and forwarding the decoded signal to the target user side includes:
judging whether the target user side successfully decodes the corresponding superposed signal or not according to the decoding signaling;
if the target user side successfully decodes the corresponding superposed signal, the superposed signal broadcasted by the base station side is not processed;
if the target user side fails to decode the corresponding superposed signal, judging whether the condition of cooperative decoding is met;
and if the condition of cooperative decoding is met, decoding the public signal in the superposed signals, and forwarding the decoded signal to the target user side.
10. The adaptive signal transmission method according to claim 9, wherein the decoding a common signal in the superimposed signal and forwarding the decoded signal to the target ue includes:
calculating the signal-to-noise ratio of the received signal of the target user side and the public signal;
calculating to obtain the total signal-to-noise ratio of the public signal decoded by the target user side by adopting a maximum ratio combining method;
calculating the rate of decoding the public signal of the target user side in the whole communication process according to a short packet transmission capacity algorithm;
adding the rate of decoding the public signals in the whole communication process and the rate of decoding the private signals in the broadcasting stage to obtain the final rate of the target user side;
and forwarding the signal to the target user side according to the final rate of the target user side.
11. The adaptive signal transmission method according to claim 9, wherein the performing signal amplification processing on the superimposed signal broadcasted by the base station side according to the obtained decoding signaling, and forwarding the amplified signal to the target user side includes:
if the cooperative decoding condition is not met, an amplifying and forwarding strategy is obtained;
and performing signal amplification processing on the superposed signals broadcast by the base station side according to the amplification factor in the amplification forwarding strategy, and forwarding the amplified signals to the target user side.
12. The adaptive signal transmission method according to claim 11, wherein the performing signal amplification processing on the superimposed signal broadcast by the base station side according to an amplification factor in an amplification forwarding strategy and forwarding the amplified signal to the target user side includes:
calculating a signal received by the target user side and a signal-to-noise ratio according to the amplification factor;
calculating the rate and the final rate of decoding the public signal in the whole communication process according to the amplified signal-to-noise ratio;
and forwarding the signal to the target user side according to the final rate of the target user side.
13. An adaptive signal transmission system, comprising: a base station side, a relay and a plurality of user sides;
the base station side is used for executing the following operations:
acquiring user information corresponding to each user side, and performing rate segmentation processing on the acquired user information to obtain a public signal and a private signal corresponding to each user;
superposing the public signals and the private signals corresponding to the user sides, and broadcasting the corresponding superposed signals to the relay and the user sides;
acquiring a decoding signaling fed back by a target user side, and continuously broadcasting corresponding superposed signals to the target user side and a relay at the same time according to the fed back decoding signaling;
the relay is configured to:
acquiring a superposition signal broadcasted by a base station side and a decoding signaling fed back by a target user side;
decoding the superposed signals broadcast by the base station side according to the acquired decoding signaling, and forwarding the decoded signals to the target user side;
or amplifying the superposed signal broadcasted by the base station side according to the acquired decoding signaling, and forwarding the amplified signal to the target user side.
14. A storage medium, characterized in that the storage medium is a computer-readable storage medium, which stores an adaptive signal transmission program for implementing the adaptive signal transmission method according to any one of claims 1-6 or 7-12 when the adaptive signal transmission program is executed by a processor.
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