CN102082598B - Double-relay wireless communication system diversity method - Google Patents
Double-relay wireless communication system diversity method Download PDFInfo
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- CN102082598B CN102082598B CN2010106111372A CN201010611137A CN102082598B CN 102082598 B CN102082598 B CN 102082598B CN 2010106111372 A CN2010106111372 A CN 2010106111372A CN 201010611137 A CN201010611137 A CN 201010611137A CN 102082598 B CN102082598 B CN 102082598B
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Abstract
The invention relates to a double-relay wireless communication system diversity method. In the communication process, a method for selecting a relay comprises the following steps: estimating the channel condition of the relay selected in the previous communication process before the current communication is carried out, and using the relay continuously if the channel condition of the relay meets the preset conditions; and otherwise, estimating the channel condition of the other relay, and then selecting a link with the best channel condition for communication from the two relays. A system applying the method has the advantages of low complexity and good transmission performance; and both the complexity and transmission performance of the system are preferably considered.
Description
Technical field
The present invention relates in a kind of pair of relay wireless communications system by the deversity scheme of selecting a relaying to communicate.
Background technology
Future broadband wireless communication systems sharply expands for the requirement of message transmission rate, but the frequency resource that can be used for mobile communication is but very limited, in order to support the transfer of data of more speed under the frequency resource condition limited, must the new spectral efficient technology of research.Diversity technique is a kind of anti-fading technology of mobile communication, is that the investment that a kind of use is relatively cheap just can significantly improve the strong transmission technology of radio link performance, mainly comprises frequency diversity, time diversity and space diversity etc.Signal source or (with) to use the space diversity reception to communicate (MIMO) of many antennas and the multi-user diversity under multi-user environment be the important technology of current wireless Communication Studies to destination.Following DWCS, owing to can carrying out the collaboration communication cooperation of relaying (or by means of) between the user, makes system resource be developed to a greater extent.Traditional antenna space diversity technique mainly comprises: high specific merges diversity (MRC), selects to merge diversity (SC), switches merging diversity (SSC).
Yet, due to the restriction that is subject to power, terminal size, complexity, user terminal is difficult to use multi-antenna technology usually.And the employing relaying technique can provide a kind of distributed space diversity transmission technology, become the effective way addressed this problem.Wireless relay communication system is comprised of signal source, relaying and destination usually, and the link that participates in communication mainly contains signal source-relaying-destination link and signal source-destination tie link.Relaying technique can bring space diversity, improves efficiency of transmission.In actual communication system, because a plurality of relayings exist simultaneously, How to choose utilizes relaying can affect greatly the performance of system.Specifically, in the communication system of a plurality of relayings, if each communication is all to use all relayings, can be described as distributed high specific and merge diversity, as optimum relaying of each selection can be described as distributed selection, merge diversity.Accordingly, by the restriction of signal-noise ratio threshold, at different relay wells, switch use, can be described as switching and merge diversity.
If there are two relayings in relay communications system.Main communication mode has: use two relayings simultaneously; Relaying of choice for use.Relaying of each communication choice for use can effectively improve the availability of frequency spectrum of system.If all pass through the relaying of an optimum of alternative at every turn, system complexity can significantly improve.
Summary of the invention
Purpose of the present invention just is to provide a kind of pair of relay wireless communication system diversity method, and the method is applicable to the relay selection in the network of two relayings.Use the system complexity of the method low, and transmission performance is better, has well taken into account the complexity of system and the transmission performance of system.
The present invention solves its technical problem, and the first technical scheme adopted is:
A kind of pair of relay wireless communication system diversity method, the signal of signal source is by relay forwarding to destination, and described relaying has two, and destination does not adopt high specific to be merged into Serial Communication, and destination adopts following methods to select relaying:
When A, communication are initiated, a relaying of random selection communicates, later before each communication occurs, the last time instantaneous equivalent signal to noise ratio of communication is first estimated in communication: by the estimated signal source to the link of selected relaying last time, last time be relayed to the instantaneous signal-to-noise ratio of destination, thereby estimate the instantaneous equivalent signal to noise ratio of last time communicating by letter;
B, the instantaneous equivalent signal to noise ratio that then will last time communicate by letter and signal-noise ratio threshold value T compare, and as higher than signal-noise ratio threshold value T, still select last time selected relaying to carry out this communication; Otherwise, estimate the instantaneous equivalent signal to noise ratio of the channel link that another relaying is corresponding, and it is compared with the instantaneous equivalent signal to noise ratio of last time communicating by letter, if last time the instantaneous equivalent signal to noise ratio of communication was more than or equal to the instantaneous equivalent signal to noise ratio of the channel link that another relaying is corresponding, still select last time selected relaying to carry out this communication; Otherwise, select another relaying to carry out this communication.
Above the first technical scheme is suitable between signal source and destination without the tie link situation, or the tie link channel quality is very poor, without situation about using.
The present invention solves its technical problem, and the second technical scheme adopted is:
A kind of pair of relay wireless communication system diversity method, the signal of signal source by relay forwarding to destination.Wherein, relaying has two, and destination adopts high specific to be merged into Serial Communication, and destination adopts following methods to select relaying:
When A, communication are initiated, a relaying of random selection communicates, later before each communication occurs, first estimate the last time instantaneous equivalent signal to noise ratio of communication: by the estimated signal source, arrive destination, signal source to the link of selected relaying last time, last time be relayed to the instantaneous signal-to-noise ratio of destination, thereby estimate the last time instantaneous equivalent signal to noise ratio of communication;
B, the instantaneous equivalent signal to noise ratio that then will last time communicate by letter and signal-noise ratio threshold value T compare, and as higher than signal-noise ratio threshold value T, still select last time selected relaying to carry out this communication; Otherwise, estimate the instantaneous equivalent signal to noise ratio of the channel link that another relaying is corresponding, and it is compared with the instantaneous equivalent signal to noise ratio of last time communicating by letter, if last time the instantaneous equivalent signal to noise ratio of communication was more than or equal to the instantaneous equivalent signal to noise ratio of the channel link that another relaying is corresponding, still select last time selected relaying to carry out this communication; Otherwise, select another relaying to carry out this communication.
Above the second technical scheme is suitable for having between signal source and destination can be for the tie link situation of utilizing.
Compared with prior art, the invention has the beneficial effects as follows:
When the present invention is better than threshold value at the current link-quality that enlivens relaying, without the quality that compares two repeated links, also without being switched.The complexity of system reduces greatly.Because the link-quality that now enlivens relaying is better than threshold value, communication quality has obtained effective assurance simultaneously.
At the current link-quality that enlivens relaying, during lower than threshold value, the present invention not simply is switched to another relaying, but the quality of two repeated links relatively again selects optimum relaying to communicate.Therefore in the situation that network signal is poor, the present invention is consistent with optimum relay selection method, can improve to greatest extent communication system performance.
In a word, the present invention, in the situation that signal of communication is good, does not carry out the comparison and switching of two relayings, in the situation that guarantee system communication quality, system complexity reduces greatly.And in the situation that signal of communication is poor, then carry out the comparison and switching of two relayings, can guarantee to greatest extent the communication performance of system.Communication performance and the complexity of system have well been taken into account.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The accompanying drawing explanation
The system model schematic diagram that Fig. 1 is the embodiment of the present invention 1.Figure comprises a signal source, two relayings and a destination, and each communication is used relaying of choice for use to carry out.Wherein
For the instantaneous signal-to-noise ratio of signal source to relaying,
For being relayed to the instantaneous signal-to-noise ratio of destination.
When Fig. 2 is embodiment 1 method with the instantaneous equivalent signal to noise ratio of last time communicating by letter in the operation of B step lower than signal-noise ratio threshold value T, do not carry out the relaying alternative, and the method for directly selecting another relaying to communicate (hereinafter to be referred as switching stop method), the system break probability curve under the amplification forwarding mode respectively.γ wherein
ThFor the system break signal to noise ratio.
Fig. 3 is embodiment 1 and switches accordingly the system break probability curve of stop method under relaying employing decoding pass-through mode.
Fig. 4 is embodiment 1 and switches accordingly the error rate of system curve of stop method under relaying employing amplification forwarding mode.
Fig. 5 is embodiment 1 and switches accordingly the error rate of system curve of stop method under relaying employing decoding pass-through mode.
The system model schematic diagram that Fig. 6 is the embodiment of the present invention 2.Figure comprises a signal source, two relayings and a destination, and each communication is used relaying of choice for use to carry out.Wherein
For the instantaneous signal-to-noise ratio of signal source to relaying,
For being relayed to the instantaneous signal-to-noise ratio of destination; γ
SDFor the instantaneous signal-to-noise ratio of signal source to destination.
Fig. 7 is that embodiment 2 and corresponding switching stop method thereof (are when in the operation of B step, last time the instantaneous equivalent signal to noise ratio of communication was lower than signal-noise ratio threshold value T equally, do not carry out the relaying alternative, and directly select another relaying to communicate), system break probability curve under the amplification forwarding mode, wherein γ
ThThe system break signal to noise ratio.
Fig. 8 is embodiment 2 and switches accordingly the system break probability curve of stop method under relaying employing decoding pass-through mode.
Fig. 9 is embodiment 2 and switches accordingly the error rate of system curve of stop method under relaying employing amplification forwarding mode.
Embodiment
Fig. 1 illustrates, and the first execution mode of the present invention is, a kind of pair of relay wireless communication system diversity method, the signal of signal source S by relay forwarding to destination D.Relaying has two, and destination D does not adopt high specific to be merged into Serial Communication, and destination D adopts following methods to select relaying:
When A, communication are initiated, select at random a relaying to communicate, before each communication generation, the last time instantaneous equivalent signal to noise ratio of communication is first estimated in communication: by estimated signal source S, arrive last time selected relaying R later
1Link, relaying R last time
1To the instantaneous signal-to-noise ratio of destination D, thereby estimate the last time instantaneous equivalent signal to noise ratio of communication.
Estimate that last time the specific practice of the instantaneous signal-to-noise ratio of communication was:
When relaying is worked in the amplification forwarding mode, destination first estimates signal source and arrives last time selected relaying R
1Instantaneous signal-to-noise ratio
With relaying R
1Instantaneous signal-to-noise ratio to destination
Value, estimate last time the equivalent signal-to-noise ratio of communication
When relaying, with the work of decoding pass-through mode, signal source S arrives last time selected relaying R
1Instantaneous signal-to-noise ratio
With relaying R
1Instantaneous signal-to-noise ratio to destination D
Value, count out last time the instantaneous equivalent signal to noise ratio of communication
B, the instantaneous equivalent signal to noise ratio that then will last time communicate by letter and signal-noise ratio threshold value T compare, and as higher than signal-noise ratio threshold value T, still select last time selected relaying R
1Carry out this communication; Otherwise, estimate another relaying R
2The instantaneous equivalent signal to noise ratio of corresponding channel link, and it is compared with the instantaneous equivalent signal to noise ratio of last time communicating by letter, if last time the instantaneous equivalent signal to noise ratio of communication was more than or equal to another relaying R
2The instantaneous equivalent signal to noise ratio of corresponding channel link, still select last time selected relaying R
1Carry out this communication; Otherwise, select another relaying R
2Carry out this communication.
Emulation experiment
The parameter setting of emulation experiment is that the channel relation meets
Signal-noise ratio threshold value T=2 γ
Th.Modulation system is BPSK.Result is as follows:
When Fig. 2 is embodiment 1 method with the instantaneous equivalent signal to noise ratio of last time communicating by letter in the operation of B step lower than signal-noise ratio threshold value T, do not carry out the relaying alternative, and the method for directly selecting another relaying to communicate (hereinafter to be referred as switching stop method), the system emulation outage probability curve under the amplification forwarding mode.γ wherein
ThFor the system break signal to noise ratio.
In Fig. 2, the curve strung by symbol " △ " is the outage probability curve under the amplification forwarding mode under embodiment 1 method, by symbol
The curve strung is the outage probability curve of the corresponding switching stop method of embodiment 1 under the amplification forwarding mode.
As can be seen from Figure 2, the method for the present embodiment is under the amplification forwarding mode, and the system break performance is switched the stop method and all promoted about 1 dB.
Fig. 3 is embodiment 1 and switches accordingly the system break probability curve of stop method under relaying employing decoding pass-through mode.
In Fig. 3, the curve strung by symbol " " is the outage probability curve under the decoding pass-through mode under embodiment 1 method, and the curve strung by symbol " zero " is the outage probability curve of the corresponding switching stop method of embodiment 1 under the decoding pass-through mode.
As can be seen from Figure 3, the method for the present embodiment forwards under two kinds of modes in decoding, and the system break performance is switched the stop method and all promoted about 1 dB.
Fig. 4 is embodiment 1 and switches accordingly the system emulation ber curve of stop method under relaying employing amplification forwarding mode.
In Fig. 4, the curve strung by symbol " △ " is the system emulation ber curve under the amplification forwarding mode under embodiment 1 method, by symbol
The curve strung is the system emulation ber curve of the corresponding switching stop method of embodiment 1 under the amplification forwarding mode.
As can be seen from Figure 4, the method for the present embodiment is under the amplification forwarding mode, and the system error performance switches the stop method and promoted about 1 dB.
Fig. 5 is embodiment 1 and switches accordingly the system emulation ber curve of stop method under relaying employing decoding pass-through mode.
In Fig. 5, by symbol
The curve strung is the system emulation ber curve under the decoding pass-through mode under embodiment 1 method, by symbol
The curve strung is the system emulation ber curve of the corresponding switching stop method of embodiment 1 under the decoding pass-through mode.
As can be seen from Figure 5, the method for the present embodiment is under the decoding pass-through mode, and the system error performance switches the stop method and promoted about 1.5dB.
Fig. 6 illustrates, and the second execution mode of the present invention is, a kind of pair of relay wireless communication system diversity method, the signal of signal source S by relay forwarding to destination D; Relaying has two, and destination D adopts high specific to be merged into Serial Communication, and destination D adopts following methods to select relaying:
When A, communication are initiated, select at random a relaying to communicate, before the generation of at every turn communicating by letter, first estimate the last time instantaneous equivalent signal to noise ratio of communication: pass through estimated signal source S to destination D, signal source S arrives last time selected relaying R later
1Link, relaying R last time
1To the instantaneous signal-to-noise ratio of destination D, thereby estimate the last time instantaneous equivalent signal to noise ratio of communication.
The specific practice of estimating instantaneous signal-to-noise ratio is:
When relaying is worked in the amplification forwarding mode, destination first estimates the instantaneous signal-to-noise ratio γ of signal source S to destination D link
SDSignal source S arrives last time selected relaying R
1Instantaneous signal-to-noise ratio
And R
1Instantaneous signal-to-noise ratio to destination D
Value, estimate last time the instantaneous equivalent signal to noise ratio of communication
When relaying, with the work of decoding pass-through mode, destination D first estimates the instantaneous signal-to-noise ratio γ of signal source S to destination D link
SD, signal source S is to relaying R
1Instantaneous signal-to-noise ratio
With relaying R
1Instantaneous signal-to-noise ratio to destination D
Value, if
Last time communication the instantaneous equivalent signal to noise ratio be
Otherwise, last time communication the instantaneous equivalent signal to noise ratio be γ
SD.
B, the instantaneous equivalent signal to noise ratio that then will last time communicate by letter and signal-noise ratio threshold value T compare, and as higher than signal-noise ratio threshold value T, still select last time selected relaying R
1Carry out this communication; Otherwise, estimate another relaying R
2The instantaneous equivalent signal to noise ratio of corresponding channel link, and it is compared with the instantaneous equivalent signal to noise ratio of last time communicating by letter, if last time the instantaneous equivalent signal to noise ratio of communication was more than or equal to another relaying R
2The instantaneous equivalent signal to noise ratio of corresponding channel link, still select last time selected relaying R
1Carry out this communication; Otherwise, select another relaying R
2Carry out this communication.
Emulation experiment
The parameter setting of emulation experiment is that the channel relation meets
Signal-noise ratio threshold value T=2 γ
Th, modulation system is BPSK.Result is as follows:
When Fig. 7 is embodiment 2 methods with the instantaneous equivalent signal to noise ratio of last time communicating by letter in the operation of B step lower than signal-noise ratio threshold value T, do not carry out the relaying alternative, and the method for directly selecting another relaying to communicate (hereinafter to be referred as switching stop method), the system emulation outage probability curve under the amplification forwarding mode.γ wherein
ThFor the system break signal to noise ratio.
In Fig. 7, the curve strung by symbol " " is the outage probability curve under the amplification forwarding mode under embodiment 2 methods, and the curve strung by symbol " zero " is the outage probability curve of the corresponding switching stop method of embodiment 2 under the amplification forwarding mode.
As can be seen from Figure 7, the method for the present embodiment is under the amplification forwarding mode, and the system error performance switches the stop method and promoted about 1 dB.
Fig. 8 is embodiment 2 and switches accordingly the system break probability curve of stop method under relaying employing decoding pass-through mode.
In Fig. 8, by symbol
The curve strung is the outage probability curve under the decoding pass-through mode under embodiment 2 methods, by symbol
The curve strung is the outage probability curve of the corresponding switching stop method of embodiment 2 under the decoding pass-through mode.
As can be seen from Figure 8, the method for the present embodiment is under the decoding pass-through mode, and system break probability performance is switched the stop method and promoted about 0.5 dB.
Fig. 9 is embodiment 2 and switches accordingly the system emulation ber curve of stop method under relaying employing amplification forwarding mode.
In Fig. 9, the curve strung by symbol " zero " is the system emulation ber curve under the amplification forwarding mode under embodiment 2 methods, and by symbol " ", " curve strung is the system emulation ber curve of the corresponding switching stop method of embodiment 2 under the amplification forwarding mode.
As can be seen from Figure 9, the method for the present embodiment is under the amplification forwarding mode, and the system error performance switches the stop method and promoted about 1 dB.
Claims (2)
1. a two relay wireless communication system diversity method, the signal of signal source (S) by relay forwarding to destination (D), it is characterized in that: described relaying has two, destination (D) does not adopt high specific to be merged into Serial Communication, and destination (D) adopts following methods to select relaying:
When A, communication are initiated, select at random a relaying to communicate, before each communication generation, the last time instantaneous equivalent signal to noise ratio of communication is first estimated in communication: by estimated signal source (S), arrive last time selected relaying (R later
1) link, relaying (R last time
1) arrive the instantaneous signal-to-noise ratio of destination (D), thus estimate the last time instantaneous equivalent signal to noise ratio of communication;
B, the instantaneous equivalent signal to noise ratio that then will last time communicate by letter and signal-noise ratio threshold value T compare, and as higher than signal-noise ratio threshold value T, still select last time selected relaying (R
1) carry out this communication; Otherwise, estimate another relaying (R
2) the instantaneous equivalent signal to noise ratio of corresponding channel link, and it is compared with the instantaneous equivalent signal to noise ratio of last time communicating by letter, if the instantaneous equivalent signal to noise ratio of last time communicating by letter was more than or equal to another relaying (R
2) the instantaneous equivalent signal to noise ratio of corresponding channel link, still choosing last time selected relaying carry out this communication; Otherwise, select another relaying (R
2) carry out this communication.
2. a two relay wireless communication system diversity method, the signal of signal source (S) by relay forwarding to destination (D), it is characterized in that: described relaying has two, destination (D) adopts high specific to be merged into Serial Communication, and destination (D) adopts following methods to select relaying:
When A, communication are initiated, a relaying of random selection communicates, before each generation of communicating by letter, first estimate the last time instantaneous equivalent signal to noise ratio of communication: by estimated signal source (S), arrive destination (D), signal source (S) arrives last time selected relaying (R later
1) link, relaying (R last time
1) arrive the instantaneous signal-to-noise ratio of destination (D), thus estimate the last time instantaneous equivalent signal to noise ratio of communication;
B, the instantaneous equivalent signal to noise ratio that then will last time communicate by letter and signal-noise ratio threshold value T compare, and as higher than signal-noise ratio threshold value T, still select last time selected relaying (R
1) carry out this communication; Otherwise, estimate another relaying (R
2) the instantaneous equivalent signal to noise ratio of corresponding channel link, and it is compared with the instantaneous equivalent signal to noise ratio of last time communicating by letter, if the instantaneous equivalent signal to noise ratio of last time communicating by letter was more than or equal to another relaying (R
2) the instantaneous equivalent signal to noise ratio of corresponding channel link, choosing selected relaying (R last time still
1) carry out this communication; Otherwise, select another relaying (R
2) carry out this communication.
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| CN104754606B (en) * | 2015-03-26 | 2018-04-17 | 广西师范大学 | A kind of relay selection method and system based on channel estimating |
| CN104768202B (en) * | 2015-05-04 | 2018-02-06 | 广西师范大学 | A kind of relay selection method of MIMO cooperation communication system |
| CN106068033B (en) * | 2016-01-27 | 2019-09-27 | 浙江师范大学 | Optimized power allocation method based on outage probability under a kind of new agreement of collaboration communication |
| CN107659972A (en) * | 2017-04-05 | 2018-02-02 | 中科凯普（北京）导航通信技术有限公司 | A kind of data transfer optimization method in high-speed railway communication private network |
| CN107248900A (en) * | 2017-06-30 | 2017-10-13 | 同济大学 | A kind of double relaying distribution LT code coding/decodings and transmission method |
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| CN1897576A (en) * | 2005-07-14 | 2007-01-17 | 三星电子株式会社 | Method for relaying data packet for downlink in wireless communication system |
| CN101282199A (en) * | 2008-04-14 | 2008-10-08 | 北京邮电大学 | Method for self-adaption selection of relay strategy for multi-relay collaboration communication |
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| CN1897576A (en) * | 2005-07-14 | 2007-01-17 | 三星电子株式会社 | Method for relaying data packet for downlink in wireless communication system |
| CN101282199A (en) * | 2008-04-14 | 2008-10-08 | 北京邮电大学 | Method for self-adaption selection of relay strategy for multi-relay collaboration communication |
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