CN101453800B - Bidirectional data transmission processing method for multi-hop relay system and communication intermediate apparatus - Google Patents
Bidirectional data transmission processing method for multi-hop relay system and communication intermediate apparatus Download PDFInfo
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Abstract
The invention discloses a bidirectional data transmission processing method and a communication intermediate device in a multi-hop relay system, wherein the communication intermediate device comprises a coding-modulating mode selection module, a coding module, a network coding module, a modulating module and a broadcasting module; the coding-modulating mode selection module is used for selecting a first coding-modulating mode and a second coding-modulating mode for a first link and a second link respectively according to a link self-adapting method; the coding module is used for coding an aim-end signal bit and a source-end signal bit respectively according to a first coding rate and a second coding rate; the network coding module is used for performing zero insertion on the coded source-end signal bit and the aim-end signal bit and then performing network coding; the modulating module is used for modulating a signal bit obtained in network coding operation; and the broadcasting module is used for broadcasting output the output data of the modulating module. The invention has the advantage of improving the frequency-spectrum utilization rate of the system.
Description
Technical field
The scheduling of resource that the present invention relates in the multi-hop relay system (Multi-hop Relay System) is handled, data transmission processing method in particularly a kind of multi-hop relay system and communication middle device.
Background technology
Multi-hop relay system provides following two kinds of obvious gain as a key technology in the following mobile radio system:
The expansion of base station coverage area, (signal can be transmitted through relay stations for Relay Station, use RS), has reduced the path loss in the signal transmission, makes multi-hop relay system be able to cover bigger zone owing to relay stations;
The raising of system communication link capacity; Because multi-hop relay system is compared the path loss that single-hop systems can reduce the signal transmission; Thereby same power can be supported the transmission rate that link is higher; Through arranging relay stations at hot zones, can improve the link capacity of hot zones user link, the upstream or downstream transmission service of higher rate is provided.
When the introducing of relay stations brought above-mentioned advantage, it is complicated more that the allocation of radio resources in the multi-hop relay system and the design of signal transmission form also become, and faces more challenges.
Different with the mode of traditional transceiver direct communication; In multi-hop relay system, signal demand transmits between transceiver through the forwarding of relay stations, and the signal of relay stations is accepted and transmission can not be operated on the same Radio Resource; So need be base station (Base Station; BS) (Mobile Station, down direction MS) distribute different Radio Resources with travelling carriage to the up direction that relay stations arrive the base station again to arrive travelling carriage again to relay stations; And through rational resource allocation and the effectively design of signal transmission form, improving utilization ratio of wireless resources is an important indicator of multi-hop relay system.
Traditional multi-hop relay system has adopted four step separate signal transmission meanss, and as shown in Figure 2, signal of base station bit D1 sends to travelling carriage, and the signal bit D2 of travelling carriage sends to the base station then need pass through following 4 steps:
Signal bit D1 sends to relay stations from the base station;
Signal bit D1 sends to travelling carriage from relay stations;
Signal bit D2 sends to relay stations from moving;
Signal bit D2 sends to the base station from relay stations.
The two-way relay transmission of aforesaid way realizes simple, but distributes different Radio Resources respectively owing to need be respectively the transmission of above-mentioned 4 steps, so its resource utilization is quite low.
In order to solve the low problem of resource utilization that traditional multi-hop relay system exists, a kind of scheme of the two-way relay transmission of encoding has been proposed, it has introduced the thought of network coding technique.
As shown in Figure 2, the scheme of this coding transmitted in both directions comprises the steps:
After primary signal bit D1 is preserved in the base station, with sending to relay stations after its coded modulation;
After travelling carriage is preserved primary signal bit D2, with sending to relay stations after its coded modulation;
After relay stations are distinguished demodulating and decoding to received signal, obtain coming from the primary signal bit D1 and the D2 of base station and travelling carriage;
Relay stations are done the XOR processing to primary signal bit D1 and D2 by bit, obtain D3;
Relay stations carry out sending after the coded modulation to D3;
Base station/travelling carriage obtains D3 after the decoding demodulation after receiving the signal that relay stations send, and the primary signal bit D1/D2 of D3 and preservation is carried out by the processing of bit XOR, thereby obtain D2/D1.
Can realize two-way relay transmission through above-mentioned process.
Compare with traditional multi-hop relay transmission means, the maximum characteristics of this scheme have been to save 1/4th Radio Resource, have reached higher system spectrum utilance.
Two-way relay transmission plan greatly improves the system spectrum utilance though encode, and also there is following problem in this method.
In conjunction with shown in Figure 2; In the broadcasting step of the two-way relay transmission of coding; Relay stations can only be done signal broadcasting with unique a kind of modulation system, yet because relay stations are two separate links to base station and relay stations to travelling carriage, under the channel quality of two links differs bigger situation; Under the two-way relay transmission means of encoding; That relatively poor link of channel quality will become a bottleneck of system signal transmission because channel quality relatively preferably that link also can only adopt that link the same modulation system relatively poor with channel quality, and this modulation system is a kind of signal transmission form of poor efficiency waste with respect to its channel quality.
Above-mentioned shortcoming is to be the explanation that example is carried out with relay stations, but this shortcoming equally also is present in other carry out the relay stations function like base station, access point situation.
Summary of the invention
The purpose of this invention is to provide data transmission processing method and communication middle device in a kind of multi-hop relay system, improve the availability of frequency spectrum of system.
To achieve these goals; The invention provides the bidirectional data transmission processing method in a kind of multi-hop relay system; Comprise: the communication middle device is to after distinguishing demodulating and decoding from the reception signal of source end device and destination device; Obtain the step of source end signal bit and destination signal bit, wherein, this method also comprises:
Above-mentioned method wherein, also comprises:
Steps A 3; Source end device and destination device carry out demodulation to the broadcast data that receives according to the modulation system of selecting in the steps A 1; And the signal bit behind the data after the demodulation and the coding that self preserves carried out the corresponding operation of network code operation, obtain data to be received.
Above-mentioned method, wherein said communication middle device is relay stations, base station or access point.
In order better to realize above-mentioned purpose, the present invention also provides a kind of communication middle device, comprises receiver module, demodulation module and decoder module, wherein, also comprises:
Modulation system is selected module, and being used to utilize chain circuit self-adaptive method is first link and the second link selection modulation system, in the modulation system of selecting not simultaneously, is that first link and second link are selected a kind of modulation system from different modulation modes;
The code rate determination module, first link and corresponding first code rate and second code rate of second link under the modulation system that is used for confirming to select according to channel quality;
Coding module is used for according to first code rate and second code rate is respectively the destination signal bit and source end signal bit is encoded;
The network code module is used for destination signal bit behind the coding module coding and source end signal bit are carried out the network code operation;
Modulation module is used for modulating according to the result that the modulation system that modulation system selects module to select is operated network code;
Broadcast module is used for the dateout of modulation module is broadcasted.
Above-mentioned device is arranged at relay stations, base station or access point.
In order better to realize above-mentioned purpose; The present invention also provides the bidirectional data transmission processing method in a kind of multi-hop relay system; Comprise: the communication middle device is to after distinguishing demodulating and decoding from the reception signal of source end device and destination device; Obtain the step of source end signal bit and destination signal bit, wherein, this method also comprises:
Step C1 is respectively first code modulation mode and second code modulation mode that comprises second code rate and second modulation system that first link and second link selection comprise first code rate and first modulation system according to chain circuit self-adaptive method;
Step C2 encodes to destination signal bit and source end signal bit respectively by first code rate and second code rate, and source end signal bit and destination signal bit behind the coding are operated as follows:
In the pairing signal bit bag of the less modulation system of data bit width; Every X signal bit is inserted Δ X individual 0 at the back; To insert the 0 signal bit signal bit corresponding that obtain then and carry out the network code operation with another modulation system; Wherein, X is the data bit width of the less modulation system of data bit width, and Δ X is the difference of the data bit width of modulation system;
Step C3, the data that operation obtains to network code are modulated back broadcasting.
Above-mentioned method wherein, also comprises:
Step C4; Source end device and destination device carry out demodulation to the broadcast data that receives according to the modulation system among the step C3; And after the signal bit behind the coding that the data after the demodulation and self are preserved inserts 0 processing; Carry out the respective operations of the network code operation among the said step C2, obtain data to be received.
Above-mentioned method, wherein, among the said step C3 be modulated to hierarchical modulation or according to the mapping principle modulation of preset planisphere.
Above-mentioned method, wherein, among the said step C3, when the data that operation obtains to network code were carried out hierarchical modulation, said step C4 specifically comprised:
Step C41; The source end device to the broadcast data that receives according to the demodulation of hierarchical modulation principle; And the source end signal bit behind the coding that the data after the demodulation and self are preserved insert 0 handle after, carry out the respective operations that the network code among the said step C2 is operated, the destination signal bit after obtaining encoding; Destination signal bit behind the coding is decoded by first code rate, finally obtain the destination signal bit;
Step C42; The destination device to the broadcast data that receives according to the demodulation of hierarchical modulation principle; And the destination signal bit behind the coding that the data after the demodulation and self are preserved insert 0 handle after, carry out the respective operations that the network code among the said step C2 is operated, the source end signal bit after obtaining encoding; Source end signal bit behind the coding is decoded by second code rate, finally obtain source end signal bit.
Above-mentioned method; Wherein, Among the said step C3; The data that network code operation is obtained are during according to the mapping principle modulation of preset planisphere, the distance of enhancement layer on preset planisphere greater than conventional constellation figure modulator approach in the distance of enhancement layer on planisphere, and the distance of basic layer on preset planisphere equals the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach.
Above-mentioned method, wherein, said step C4 specifically comprises:
Step C41 '; The higher end of modulation system is according to the mapping principle restituted signal of modulation constellation; Then with the signal after the demodulation and the bit bag behind the coding in the buffer memory insert 0 handle after; Carry out the respective operations of the network code operation among the said step C2, obtain wanting the data that receive according to the bit bag behind its code rate decoding XOR at last;
Step C42 '; The lower end of modulation system is according to the position of the known data bit of storing in its buffer memory according to the actual mapped constellation points of signal of the mapping principle judgement needs demodulation of modulation constellation; The signal of broadcasting according to the modulation constellation demodulation of simplifying then; Again with buffer memory in coding after the bit bag insert 0 handle after; Carry out the respective operations of the network code operation among the said step C2, obtain wanting the data that receive according to the bit bag behind its code rate decoding XOR at last.
Above-mentioned method, wherein said communication middle device is relay stations, base station or access point.
In order better to realize above-mentioned purpose, the present invention also provides a kind of communication middle device, comprises receiver module, demodulation module and decoder module, wherein, also comprises:
Code modulation mode is selected module, is used for being respectively first code modulation mode and second code modulation mode that comprises second code rate and second modulation system that first link and second link selection comprise first code rate and first modulation system according to chain circuit self-adaptive method;
Coding module is used for according to first code rate and second code rate is respectively the destination signal bit and source end signal bit is encoded;
The network code module is used for source end signal bit and destination signal bit behind the coding are handled as follows:
In the pairing signal bit bag of the less modulation system of data bit width; Every X signal bit is inserted Δ X individual 0 at the back; To insert the 0 signal bit signal bit corresponding that obtain then and carry out the network code operation with another modulation system; Wherein, X is the data bit width of the less modulation system of data bit width, and Δ X is the difference of the data bit width of modulation system;
Modulation module is used for the signal bit that operation obtains to network code and modulates;
Broadcast module is used for the dateout of modulation module is broadcasted.
Above-mentioned communication middle device, wherein, said modulation module adopts hierarchical modulation or modulates according to the mapping principle of preset planisphere.
Above-mentioned communication middle device; Wherein, When the data that said modulation module obtains the step-by-step xor operation are modulated according to the mapping principle of preset planisphere; The distance of enhancement layer on preset planisphere greater than conventional constellation figure modulator approach in the distance of enhancement layer on planisphere, and the distance of basic layer on preset planisphere equals the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach.
Above-mentioned device is arranged at relay stations, base station or access point.
The present invention has realized the raising of the availability of frequency spectrum of system through adopting new network code operation, new planisphere, and with respect to the curve of the two-way relay scheme of conventional coding, and the multi-hop relay transmission method in 4 traditional steps has bigger performance boost.
Description of drawings
Fig. 1 is the sketch map of the signal transmission form of traditional multi-hop relay system;
Fig. 2 is the sketch map of the signal transmission form of multi-hop relay system under the coding transmitted in both directions scheme;
Fig. 3 is the schematic flow sheet of the method for first embodiment of the invention;
Fig. 4 is the structural representation of the relay stations of first embodiment of the invention;
Fig. 5 is the schematic flow sheet of the method for second embodiment of the invention;
Fig. 6 is the structural representation of the relay stations of second embodiment of the invention;
Fig. 7 is the schematic flow sheet of the method for third embodiment of the invention;
Fig. 8 is the preset constellation modulation mapping graph of QPSK+16QAM;
Fig. 9 is the preset constellation modulation mapping graph of QPSK+64QAM;
Figure 10 is the preset constellation modulation mapping graph of 16QAM+64QAM;
Figure 11 is the structural representation of the relay stations of third embodiment of the invention;
Figure 12 is the simulation result sketch map of first embodiment of the invention;
Figure 13 is the simulation result sketch map of second embodiment of the invention;
Figure 14 is the simulation result sketch map of third embodiment of the invention.
Embodiment
Method of the present invention can be implemented in multiple environment, as:
Environment 4, the transmitted in both directions between RS41, RS42 and the MS43.
Environment 5, the transmitted in both directions between MS51, BS52 and the MS53;
Because the transmission process between the above-mentioned modes is basic identical, be convenient explanation, do as giving a definition:
The source end device sends the device (like the BS11 in the environment 1, the BS21 in the environment 2, the RS31 in the environment 3, the RS41 in the environment 4, the MS51 in the environment 5, the SS61 in the environment 6) of primary signal bit at down direction in the link;
The destination device sends the device (like the MS13 in the environment 1, the RS23 in the environment 2, the RS33 in the environment 3, the MS43 in the environment 4, the MS53 in the environment 5, the SS63 in the environment 6) of primary signal bit at up direction in the link;
The communication middle device is in the equipment (like the RS12 in the environment 1, the RS22 in the environment 2, the RS32 in the environment 3, the RS42 in the environment 4, the BS52 in the environment 5, the AP62 in the environment 6) between source end device and the destination device.
The primary signal bit that the source end device need send is referred to as source end signal bit;
The primary signal bit that the destination device need send is referred to as the destination signal bit;
The signal bit of the communication middle device broadcasting in the middle of the link is referred to as the M signal bit;
First link, the communication middle device is to the link of source end device;
Second link, the communication middle device is to the link of destination device.
Therefore, as previously mentioned, multi-hop relay system of the present invention comprises that not only the communication middle device is the system of RS, comprises that also the communication middle device is the system of BS or AP.
In specific embodiment of the present invention, be that the situation of RS specifies with the communication middle device, but the thing that is to be understood that, the communication middle device also can be other a situation such as BS, AP.
< first embodiment >
In the data transmission processing method in the multi-hop relay system of the first embodiment of the present invention; According to chain circuit self-adaptive method be first link and second link selection modulation system not simultaneously; Reduction or raising be the modulation system of a link wherein, makes first link identical with the modulation system of second link.
The method of the first embodiment of the present invention is as shown in Figure 3, comprising:
Relay stations in the first embodiment of the present invention are as shown in Figure 4, comprising:
Receiver module is used to receive the source end signal bit from after the coded modulation of source end device, and from the destination signal bit after the coded modulation of destination device;
Demodulation module carries out demodulation to source end signal bit after the coded modulation that receives and the destination signal bit after the coded modulation, the destination signal bit behind source end signal bit after obtaining encoding and the coding;
Decoder module is used for the destination signal bit behind source end signal bit behind the coding and the coding is decoded, and obtains source end signal bit and destination signal bit;
Modulation system is selected module, and being used to utilize chain circuit self-adaptive method is first link and the second link selection modulation system, in the modulation system of selecting not simultaneously, is that first link and second link are selected a kind of modulation system from different modulation modes;
The code rate determination module is used for confirming first link and corresponding first code rate and second code rate of second link according to channel quality;
Coding module is used for according to first code rate and second code rate is respectively the destination signal bit and source end signal bit is encoded;
Step-by-step XOR module is used for destination signal bit and source end signal bit behind the coding module coding are carried out the step-by-step xor operation;
Modulation module is used for selecting modulation system that module selects that the result of step-by-step xor operation is modulated according to modulation system;
Broadcast module is used for the dateout of modulation module is broadcasted.
With actual conditions first embodiment is further elaborated below.
According to the actual channel situation of first link and second link, when modulation system of carrying out the chain circuit self-adaptive method selection and code rate, suppose to occur following situation:
Relay stations to the source end device (being assumed to be the base station) select the code rate of 16QAM modulation system and 2/5, and relay stations are to destination device (being assumed to be travelling carriage) selection QPSK modulation system and 1/3 code rate.
This moment is under the different situation of modulation system that this two links are selected through chain circuit self-adaptive method; According to the first embodiment of the present invention; Adjustment wherein a link code modulation mode and make two two-way select same modulation systems, the adjustment mode comprises two kinds:
Relay stations are adjusted into 16QAM modulation and 1/6 code rate to the modulation system of travelling carriage link; Or
Relay stations are adjusted into QPSK modulation and 4/5 code rate to the modulation system of base station link.
Several kinds of above-mentioned situation are as shown in the table.
Wherein the adjustment of code rate is selected according to channel quality.
Encode respectively from the data bit of base station and travelling carriage according to adjusted code rate then, and the bit after will encoding does XOR and handles, at last by identical this signal of modulation system broadcasting of adjusting.
At receiving terminal then equally according to adjusted code modulation mode demodulating and decoding signal.
In the description of the first above-mentioned embodiment; Be that source end signal bit and destination signal bit behind the coding are carried out the step-by-step xor operation in step 35; And the data that the modulation system of utilizing selection in the step 34 obtains the step-by-step xor operation are modulated back broadcasting; What those skilled in the art can foresee is: the network code mode that also can adopt other in this step 34; As source end signal bit and destination signal bit after will encoding are carried out add operation; The data of utilizing in the step 34 modulation system selected that add operation is obtained are then modulated back broadcasting; And source end device/destination device carries out demodulation to the broadcast data that receives according to the modulation system of selecting in the step 34, and the source end signal bit/destination signal bit behind the coding of the data after the demodulation and self preservation is carried out reducing, the destination signal bit after obtaining encoding/source end signal bit; Destination signal bit/source end signal bit behind the coding is decoded by first code rate/second code rate, finally obtain destination signal bit/source end signal bit.
< second embodiment >
(Hierarchical Modulation HM) realizes the data transmission processing method in the multi-hop relay system with special step-by-step XOR mode in the second embodiment of the present invention, to introduce hierarchical modulation.
The thought of hierarchical modulation is: in application layer a logic business is divided into two data flow, one is the basic layer of high priority, and another is the enhancement layer of low priority.In physical layer, these two data flow points are not mapped to the different layers of signal constellation which.Because the symbolic distance after the base layer data mapping is bigger than the symbolic distance of enhancement layer; Therefore; The data flow of basic layer can be comprised away from emitter (like the base station) with near the user of generating means (like the base station) receiving, and the data flow of enhancement layer can only be received by the user near emitter (like the base station).That is to say that same logic business can be in network provides the service of different brackets according to the quality of channel condition.
Owing to introduce hierarchical modulation; Therefore the receiving system that has different SINR (in the present invention; Be source end device and destination device) must from the HM symbol, recover the bit of different layers, so handling, the step-by-step XOR must in the layer of the equal priority of HM, carry out.
Data transmission processing method in the multi-hop relay system of the second embodiment of the present invention is as shown in Figure 5, comprising:
In first modulation system and second modulation system of relay stations not simultaneously to first link of source end device and relay stations to second link of destination device; Its data bit width is inequality; At this moment, suppose that the data bit width of first modulation system is X bit, and the data bit width of first modulation system is X+ Δ X bit; At this moment; Should be in the pairing signal bit bag of first modulation system, every X signal bit is inserted Δ X 0 at the back, will insert the 0 signal bit signal bit corresponding with second modulation system that obtain then and carry out the step-by-step xor operation.
Be exemplified below; Suppose according to chain circuit self-adaptive method to be that the modulation system of first link and second link selection is respectively QPSK and 16QAM; And source end signal bit and destination signal bit behind the coding are respectively 101110010011110... and 100111101100...; At this moment, the step-by-step xor operation is as follows:
Step-by-step xor operation in the step 57 and 58 carries out xor operation and gets final product in the layer of its expectation.
The relay stations of second embodiment of the invention, as shown in Figure 6, comprising:
Receiver module is used to receive the source end signal bit from after the coded modulation of source end device, and from the destination signal bit after the coded modulation of destination device;
Demodulation module is used for source end signal bit after the coded modulation that receives and the destination signal bit after the coded modulation are carried out demodulation, the destination signal bit behind source end signal bit after obtaining encoding and the coding;
Decoder module is used for the destination signal bit behind source end signal bit behind the coding and the coding is decoded, and obtains source end signal bit and destination signal bit;
Code modulation mode is selected module; Be used for being respectively first link and second link selection, first code modulation mode and second code modulation mode according to chain circuit self-adaptive method; This first code modulation mode comprises first code rate and first modulation system, and this second code modulation mode comprises second code rate and second modulation system;
Coding module is used for according to first code rate and second code rate is respectively the destination signal bit and source end signal bit is encoded;
Step-by-step XOR module is used for signal bit is carried out the step-by-step xor operation, its operand for insert 0 handle the signal bit that obtains and coding module output without the signal bit of inserting 0 processing;
The hierarchical modulation module, the signal bit that is used for the step-by-step xor operation is obtained is carried out hierarchical modulation;
Broadcast module is used for the dateout of modulation module is broadcasted.
With actual conditions second embodiment is further elaborated below.
According to the actual channel situation of first link and second link, when modulation system of carrying out the chain circuit self-adaptive method selection and code rate, suppose to occur following situation:
Relay stations to the source end device (being assumed to be the base station) select the code rate of 16QAM modulation system and 2/5, and relay stations are to destination device (being assumed to be travelling carriage) selection QPSK modulation system and 1/3 code rate.
Under the different situation of modulation system that this two links are selected through chain circuit self-adaptive method, at first will come from the signal of base station bit and encode by 1/3 code rate, will encode by 2/5 code rate from the signal bit of travelling carriage;
After inserting two 0 after per 2 signal bit of source end signal bit behind the coding then; The source end signal bit and the destination signal bit of inserting after 0 are carried out the step-by-step XOR, and the signal bit bag that at last the step-by-step xor operation is obtained is broadcast to base station and travelling carriage by the principle of the hierarchical modulation of QPSK+QPSK.
After the base station receives the signal bit bag of broadcasting; Because its signal quality is better; Can obtain the signal bit (the signal bit bag is the 4bit bit wide) of basic layer and reinforced layer according to the constellation mapping principle restituted signal bit bag of QPSK+QPSK hierarchical modulation; Therefore, the source end signal bit behind the coding that self is preserved in the base station carries out the step-by-step xor operation with the signal bit bag that demodulates after carrying out inserting two 0 after per 2 signal bit again; At last by the bit bag behind 2/5 the code rate decoding step-by-step xor operation, obtain wanting the data that receive.
And after travelling carriage receives the signal bit bag of broadcasting; Because its signal quality is weaker; Therefore can only obtain the signal bit of basic layer according to the constellation mapping principle restituted signal bit bag of QPSK+QPSK hierarchical modulation; Therefore, in the signal bit bag with its preservation, the base layer signal bit that signal bit that obtains after per latter two signal bit of 4 signal bit deletion and demodulation obtain carries out the step-by-step xor operation; At last by the bit bag after 1/3 the code rate decoding fetch bit, obtain wanting the data that receive.
Certainly; Travelling carriage also can insert two 0 after per two signal bit in the signal bit bag of basic layer, then with the coding of self preserving after the destination signal bit carry out the step-by-step xor operation; Is unit with the result of step-by-step xor operation with 4 signal bit; Per unit is got preceding two signal bit, at last by the bit bag after 1/3 the code rate decoding fetch bit, obtains wanting the data that receive.
In the second above-mentioned embodiment; Be to be the explanation that example is carried out with special step-by-step xor operation; But those skilled in the art can foresee, and in step 55, also can the network code that source end signal bit and destination signal bit behind the coding are carried out other be operated; Like add operation, describe with add operation below:
In first modulation system and second modulation system of relay stations not simultaneously to first link of source end device and relay stations to second link of destination device; Its data bit width is inequality; At this moment, suppose that the data bit width of first modulation system is X bit, and the data bit width of first modulation system is X+ Δ X bit; At this moment; Should be in the pairing signal bit bag of first modulation system, every X signal bit is inserted Δ X 0 at the back, will insert the 0 signal bit signal bit corresponding with second modulation system that obtain then and carry out add operation and operate.
The data that then add operation obtained carry out broadcasting after the hierarchical modulation;
And in the step 57/58; Source end device/destination device carries out demodulation to the broadcast data that receives according to hierarchical modulation principle (being the constellation mapping principle); And the source end signal bit/destination signal bit behind the coding that the data after the demodulation and self are preserved is carried out reducing; Destination signal bit after obtaining encoding/source end signal bit; Destination signal bit/source end signal bit behind the coding is decoded by first code rate/second code rate, finally obtain destination signal bit/source end signal bit.
< the 3rd embodiment >
The planisphere of introducing special setting and special step-by-step XOR mode realize the data transmission processing method in the multi-hop relay system in the third embodiment of the present invention.
This step-by-step XOR method is:
In first modulation system and second modulation system of relay stations not simultaneously to first link of source end device and relay stations to second link of destination device; Its data bit width is inequality; At this moment, suppose that the data bit width of first modulation system is X bit, and the data bit width of first modulation system is X+ Δ X bit; At this moment; In the pairing signal bit bag of first modulation system, every X signal bit is inserted Δ X 0 at the back, will insert the 0 signal bit signal bit corresponding with second modulation system that obtain then and carry out the step-by-step xor operation.
Simultaneously, in the third embodiment of the present invention, planisphere is provided with according to following principle.
Under the situation that a part of bit in back is known in the one group of bit that constitutes a modulation symbol, the combination of the constellation point that this modulation symbol possibly be mapped to, just sub planisphere is with being assigned with big as far as possible constellation point distance.
Data transmission processing method in the multi-hop relay system of the third embodiment of the present invention is as shown in Figure 7, comprising:
Step 71, the source end device is preserved the source end signal bit behind the coding, and sends to relay stations after the source end signal bit modulation after will encoding;
Step 72, the destination device is preserved the destination signal bit behind the coding, and sends to relay stations after the modulation of the destination signal bit after will encoding;
Step 73, relay stations obtain source end signal bit and destination signal bit to after distinguishing demodulating and decoding from the reception signal of source end device and destination device;
Step 74; Be respectively first link and second link selection, first code modulation mode and second code modulation mode according to chain circuit self-adaptive method; This first code modulation mode comprises first code rate and first modulation system, and this second code modulation mode comprises second code rate and second modulation system;
Step 75 is encoded to destination signal bit and source end signal bit respectively by first code rate and second code rate, and source end signal bit and destination signal bit behind the coding are carried out special step-by-step xor operation;
In first modulation system and second modulation system of relay stations not simultaneously to first link of source end device and relay stations to second link of destination device; Its data bit width is inequality; At this moment, suppose that the data bit width of first modulation system is X bit, and the data bit width of first modulation system is X+ Δ X bit; At this moment; Should be in the pairing signal bit bag of first modulation system, every X signal bit is inserted Δ X 0 at the back, will insert the 0 signal bit signal bit corresponding with second modulation system that obtain then and carry out the step-by-step xor operation.
Be exemplified below; Suppose according to chain circuit self-adaptive method to be that the modulation system of first link and second link selection is respectively QPSK and 16QAM; And source end signal bit and destination signal bit behind the coding are respectively 101110010011110... and 100111101100...; At this moment, the step-by-step xor operation is as follows:
Step 76; The signal bit bag that step 65 obtains is broadcasted by the mapping principle modulation back of modulation constellation; Wherein in this planisphere; The distance of enhancement layer on planisphere is greater than the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach, and the distance of basic layer on planisphere equals the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach.
Because the modulation system of selecting in the step 74 is different; And source end device and destination device are all preserved data behind the coding that oneself sends, therefore, and for the higher end of modulation system; Must there be wherein an end know in the data that xor operation obtains in the step 75; Back a part of bit in one group of bit of a modulation symbol of formation at this moment, is assigned to big as far as possible constellation point distance with modulation symbol; The distance of enhancement layer on planisphere that obtain this moment is greater than the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach, and the distance of basic layer on planisphere equals the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach.
Be elaborated in the face of above-mentioned planisphere down.
As shown in Figure 8, be the constellation modulation mapping graph of QPSK+16QAM, wherein, the symbol implication is following:
It is 00 data that triangle is represented latter two bit;
It is 01 data that rhombus is represented latter two bit;
It is 10 data that square is represented latter two bit;
It is 11 data that circle is represented latter two bit.
As can be seen from the figure, with respect to traditional planisphere, the distance of its basic layer on planisphere increased, and the distance of enhancement layer on planisphere do not change.
Fig. 9 and Figure 10 are respectively the constellation modulation mapping graph of QPSK+64QAM and 16QAM+64QAM, and with respect to traditional planisphere, the distance of its basic layer on planisphere also increased, and the distance of enhancement layer on planisphere do not change.
Step 77; The higher end of modulation system is according to the mapping principle restituted signal of modulation constellation; Then according to the mode of the signal bit bag step-by-step XOR in the step 75; Signal after the demodulation and the bit bag behind the coding in the buffer memory are done XOR handle, obtain wanting the data accepted according to the bit bag behind its code rate decoding XOR at last;
Step 78; The end that modulation system is lower; At first according to the position of the known data bit of storing in its buffer memory according to the actual mapped constellation points of signal of the mapping principle judgement needs demodulation of modulation constellation; Then according to the signal of the modulation constellation demodulation broadcasting of simplifying, again with the signal of demodulation by according to data XOR behind the XOR mode in the step 75 and the coding in the buffer memory, obtain wanting the signal data that receives by its actual code rate this signal data bag of decoding at last.
The relay stations of third embodiment of the invention, shown in figure 11, comprising:
Receiver module is used to receive the source end signal bit from after the coded modulation of source end device, and from the destination signal bit after the coded modulation of destination device;
Demodulation module is used for source end signal bit after the coded modulation that receives and the destination signal bit after the coded modulation are carried out demodulation, the destination signal bit behind source end signal bit after obtaining encoding and the coding;
Decoder module is used for the destination signal bit behind source end signal bit behind the coding and the coding is decoded, and obtains source end signal bit and destination signal bit;
Code modulation mode is selected module; Be used for being respectively first link and second link selection, first code modulation mode and second code modulation mode according to chain circuit self-adaptive method; This first code modulation mode comprises first code rate and first modulation system, and this second code modulation mode comprises second code rate and second modulation system;
Coding module is used for according to first code rate and second code rate is respectively the destination signal bit and source end signal bit is encoded;
Step-by-step XOR module is used for signal bit is carried out the step-by-step xor operation, its operand for insert 0 handle the signal bit that obtains and coding module output without the signal bit of inserting 0 processing;
The planisphere modulation module; The signal bit that is used for the step-by-step xor operation is obtained is modulated by the planisphere modulation principle; Wherein, In this planisphere, the distance of basic layer enhancement layer on planisphere is greater than the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach, and the distance of basic layer on planisphere equals the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach;
Broadcast module is used for the dateout of modulation module is broadcasted.
With actual conditions the 3rd embodiment is further elaborated below.
According to the actual channel situation of first link and second link, when modulation system of carrying out the chain circuit self-adaptive method selection and code rate, suppose to occur following situation:
Relay stations to the source end device (being assumed to be the base station) select the code rate of 16QAM modulation system and 2/5, and relay stations are to destination device (being assumed to be travelling carriage) selection QPSK modulation system and 1/3 code rate.
Under the different situation of modulation system that this two links are selected through chain circuit self-adaptive method, at first will come from the signal of base station bit and encode by 1/3 code rate, will encode by 2/5 code rate from the signal bit of travelling carriage;
After inserting two 0 after per 2 signal bit of source end signal bit behind the coding then, the source end signal bit and the destination signal bit of inserting after 0 are carried out the step-by-step XOR, the signal bit bag that at last the step-by-step xor operation is obtained.
Then, the signal bit bag that again the step-by-step xor operation is obtained is broadcast to base station and travelling carriage by the mapping principle modulation signal of modulation constellation shown in Figure 8.
In base station end; Because modulation system is higher; It is directly behind the mapping principle restituted signal according to modulation constellation shown in Figure 8; The mode of the signal bit bag step-by-step XOR in 75 is set by step done XOR with the signal after the demodulation and the bit bag behind the coding in the buffer memory and is handled, and obtains wanting the data accepted according to the bit bag behind its code rate decoding XOR at last;
And at mobile you; At first need the position of the actual mapped constellation points of signal of demodulation to be the constellation point of rhombus representative among Fig. 8 according to the mapping principle judgement of the modulation constellation of the known data bit of storing in its buffer memory (as 1001) and Fig. 8; So only need similar QPSK signal of demodulation; Mode according to the signal bit bag step-by-step XOR in the step 75; Signal after the demodulation and the bit bag behind the coding in the buffer memory are done XOR handle, obtain wanting the data accepted according to the bit bag behind its code rate decoding XOR at last.
In the 3rd above-mentioned embodiment; Be to be the explanation that example is carried out with special step-by-step xor operation; But those skilled in the art can foresee, and in step 75, also can the network code that source end signal bit and destination signal bit behind the coding are carried out other be operated; Like add operation, describe with add operation below:
In first modulation system and second modulation system of relay stations not simultaneously to first link of source end device and relay stations to second link of destination device; Its data bit width is inequality; At this moment, suppose that the data bit width of first modulation system is X bit, and the data bit width of first modulation system is X+ Δ X bit; At this moment; Should be in the pairing signal bit bag of first modulation system, every X signal bit is inserted Δ X 0 at the back, will insert the 0 signal bit signal bit corresponding with second modulation system that obtain then and carry out add operation.
The data that then add operation obtained are broadcasted by the mapping principle modulation back of modulation constellation;
In step 77 and 78, then be reducing.
Figure 12, Figure 13 and Figure 14 are respectively three embodiment of the present invention with respect to the multi-hop relay transmission method in 4 traditional steps and the emulation sketch map of the two-way relay scheme of conventional coding; Wherein, Among Figure 12, Figure 13 and Figure 14; Abscissa is the average SNR of RS to MS, and ordinate is spectrum efficiency, and three curves among Figure 12, Figure 13 and Figure 14 are followed successively by from top to bottom: the curve of the inventive method (the uppermost curve among Figure 12, Figure 13 and Figure 14 corresponds respectively to 3 embodiment of the present invention); The curve of the two-way relay scheme of conventional coding, and the multi-hop relay transmission method in 4 traditional steps.
Wherein, simulated conditions is following:
Adjacent base station dot spacing: 500m
Path loss model: 128.1+37.6log10 (R), R (km)
Shadow fading: standard deviation 8dB
Rapid fading model: Jake fading: single footpath channel
Business model: random data packet generation
Modulation coding mode:
Modulation system: QPSK, 16QAM, 64QAM
Code rate: 1/6,1/4,1/3,1/2,2/3
Average SINR:
Relay stations are to base station link: 7dB
Relay stations are to the travelling carriage link: (travelling carriage evenly distributes)
[14.5，13.5，12.0，10.5，8.5，7.5，5.5，4.5，3.5，2.0，1.5，0.5，-0.5，-1.0]dB
As can be seen from the figure, 3 embodiment of method of the present invention, under the situation of the average SNR variation of MS, with respect to conventional method, performance all has lifting by a relatively large margin at RS.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (16)
1. the bidirectional data transmission processing method in the multi-hop relay system; Comprise: the communication middle device is to after distinguishing demodulating and decoding from the reception signal of source end device and destination device; Obtain the step of source end signal bit and destination signal bit, it is characterized in that, this method also comprises:
Steps A 1; The communication middle device according to chain circuit self-adaptive method for first link and the communication middle device of communication middle device between the end device of source to the modulation system of second link selection between the destination device not simultaneously; Select wherein a kind of modulation system, and further confirm first link and corresponding first code rate and second code rate of second link under this modulation system according to channel quality;
Steps A 2; Respectively destination signal bit and source end signal bit are encoded by first code rate and second code rate; Source end signal bit behind the coding and destination signal bit are carried out the network code operation, and utilize the modulation system of selecting in the steps A 1 that the data that said network code operation obtains are modulated back broadcasting.
2. method according to claim 1 is characterized in that, also comprises:
Steps A 3; Source end device and destination device carry out demodulation to the broadcast data that receives according to the modulation system of selecting in the steps A 1; And, obtain data to be received with the respective operations that the signal bit behind the coding of the data after the demodulation and self preservation is carried out the network code operation in the said steps A 2.
3. method according to claim 1 and 2 is characterized in that, said communication middle device is relay stations, base station or access point.
4. a communication middle device comprises receiver module, demodulation module and decoder module, it is characterized in that, also comprises:
Modulation system is selected module; Be used to utilize chain circuit self-adaptive method for the communication middle device to first link between the end device of source and the middle device of communicating by letter to the second link selection modulation system between the destination device; In the modulation system of selecting not simultaneously, be that first link and second link are selected a kind of modulation system from different modulation modes;
The code rate determination module, first link and corresponding first code rate and second code rate of second link under the modulation system that is used for confirming to select according to channel quality;
Coding module is used for according to first code rate and second code rate is respectively the destination signal bit and source end signal bit is encoded;
The network code module is used for destination signal bit behind the coding module coding and source end signal bit are carried out the network code operation;
Modulation module is used for modulating according to the result that the modulation system that modulation system selects module to select is operated network code;
Broadcast module is used for the dateout of modulation module is broadcasted.
5. device according to claim 4 is characterized in that, is arranged at relay stations, base station or access point.
6. the bidirectional data transmission processing method in the multi-hop relay system; Comprise: the communication middle device is to after distinguishing demodulating and decoding from the reception signal of source end device and destination device; Obtain the step of source end signal bit and destination signal bit, it is characterized in that, this method also comprises:
Step C1 is respectively the communication middle device comprises first code rate and first modulation system to second link selection between the destination device to first link between the end device of source and communication middle device first code modulation mode and second code modulation mode that comprises second code rate and second modulation system according to chain circuit self-adaptive method;
Step C2 encodes to destination signal bit and source end signal bit respectively by first code rate and second code rate, and source end signal bit and destination signal bit behind the coding are carried out following operation:
In the pairing signal bit bag of the less modulation system of data bit width; Every X signal bit is inserted Δ X individual 0 at the back; To insert the 0 signal bit signal bit corresponding that obtain then and carry out the network code operation with another modulation system; Wherein, X is the data bit width of the less modulation system of data bit width, and Δ X is the difference of the data bit width of modulation system;
Step C3, the data that operation obtains to network code are modulated back broadcasting.
7. method according to claim 6 is characterized in that, also comprises:
Step C4; Source end device and destination device carry out demodulation to the broadcast data that receives according to the modulation system among the step C3; And after the signal bit behind the coding that the data after the demodulation and self are preserved inserts 0 processing; Carry out the respective operations of the network code operation among the said step C2, obtain data to be received.
8. method according to claim 7 is characterized in that, among the said step C3 be modulated to hierarchical modulation or according to the mapping principle modulation of preset planisphere.
9. method according to claim 8 is characterized in that, among the said step C3, when the data that operation obtains to network code were carried out hierarchical modulation, said step C4 specifically comprised:
Step C41; The source end device to the broadcast data that receives according to the demodulation of hierarchical modulation principle; And the source end signal bit behind the coding that the data after the demodulation and self are preserved insert 0 handle after, carry out the respective operations that the network code among the said step C2 is operated, the destination signal bit after obtaining encoding; Destination signal bit behind the coding is decoded by first code rate, finally obtain the destination signal bit;
Step C42; The destination device to the broadcast data that receives according to the demodulation of hierarchical modulation principle; And the destination signal bit behind the coding that the data after the demodulation and self are preserved insert 0 handle after, carry out the respective operations that the network code among the said step C2 is operated, the source end signal bit after obtaining encoding; Source end signal bit behind the coding is decoded by second code rate, finally obtain source end signal bit.
10. method according to claim 8; It is characterized in that; Among the said step C3; The data that network code operation is obtained are during according to the mapping principle modulation of preset planisphere, the distance of enhancement layer on preset planisphere greater than conventional constellation figure modulator approach in the distance of enhancement layer on planisphere, and the distance of basic layer on preset planisphere equals the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach.
11. method according to claim 10 is characterized in that, said step C4 specifically comprises:
Step C41 '; The higher end of modulation system is according to the mapping principle restituted signal of modulation constellation; Then with the signal after the demodulation and the bit bag behind the coding in the buffer memory insert 0 handle after; Carry out the respective operations of the network code operation among the said step C2, obtain wanting the data that receive according to the bit bag behind its code rate decoding XOR at last;
Step C42 '; The lower end of modulation system is according to the position of the known data bit of storing in its buffer memory according to the actual mapped constellation points of signal of the mapping principle judgement needs demodulation of modulation constellation; The signal of broadcasting according to the modulation constellation demodulation of simplifying then; Again with buffer memory in coding after the bit bag insert 0 handle after; Carry out the respective operations of the network code operation among the said step C2, obtain wanting the data that receive according to the bit bag behind its code rate decoding XOR at last.
12., it is characterized in that said communication middle device is relay stations, base station or access point according to any described method of claim in the claim 6 to 11.
13. a communication middle device comprises receiver module, demodulation module and decoder module, it is characterized in that, also comprises:
Code modulation mode is selected module, is used for being respectively the communication middle device comprises first code rate and first modulation system to second link selection between the destination device to first link between the end device of source and communication middle device first code modulation mode and second code modulation mode that comprises second code rate and second modulation system according to chain circuit self-adaptive method;
Coding module is used for according to first code rate and second code rate is respectively the destination signal bit and source end signal bit is encoded;
The network code module is used for source end signal bit behind the coding and destination signal bit are carried out following operation:
In the pairing signal bit bag of the less modulation system of data bit width; Every X signal bit is inserted Δ X individual 0 at the back; To insert the 0 signal bit signal bit corresponding that obtain then and carry out the network code operation with another modulation system; Wherein, X is the data bit width of the less modulation system of data bit width, and Δ X is the difference of the data bit width of modulation system;
Modulation module is used for the signal bit that operation obtains to network code and modulates;
Broadcast module is used for the dateout of modulation module is broadcasted.
14. communication middle device according to claim 13 is characterized in that, said modulation module adopts hierarchical modulation or modulates according to the mapping principle of preset planisphere.
15. communication middle device according to claim 13; It is characterized in that; When the said modulation module data that operation obtains to network code are modulated according to the mapping principle of preset planisphere; The distance of enhancement layer on preset planisphere greater than conventional constellation figure modulator approach in the distance of enhancement layer on planisphere, and the distance of basic layer on preset planisphere equals the distance of enhancement layer on planisphere in the conventional constellation figure modulator approach.
16. according to claim 13,14 or 15 described communication middle devices, it is characterized in that, be arranged at relay stations, base station or access point.
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| JP5441172B2 (en) * | 2010-05-19 | 2014-03-12 | 日本電気株式会社 | Wireless network relay device, modulation method of wireless network relay device, and computer program |
| CN102447667B (en) | 2010-09-30 | 2015-04-29 | 华为技术有限公司 | Data processing method and system based on network coding |
| WO2012159300A1 (en) * | 2011-06-27 | 2012-11-29 | 华为技术有限公司 | Network-coding-based cooperation communication method and system, base station and relay node |
| CN103248592B (en) * | 2012-02-08 | 2018-04-27 | 株式会社Ntt都科摩 | Multi-user data transmission method, system and relay node based on hierarchical modulation |
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