CN104836643A - Communication method based on MIMO-OFDM and physical layer network coding - Google Patents
Communication method based on MIMO-OFDM and physical layer network coding Download PDFInfo
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- CN104836643A CN104836643A CN201510189407.8A CN201510189407A CN104836643A CN 104836643 A CN104836643 A CN 104836643A CN 201510189407 A CN201510189407 A CN 201510189407A CN 104836643 A CN104836643 A CN 104836643A
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Abstract
The invention relates to a communication method based on MIMO-OFDM and physical layer network coding, which belongs to the technical field of wireless communication. The communication method aims to further improve the performance of a wireless communication system, increase network throughput of a communication system, and reduce error rate of the communication system. The invention provides a communication method based on MIMO-OFDM and physical layer network coding. The communication method comprises OFDM modulation at the phase of multiple access and STBC coding; signal receiving and signal superposing at the relay node; superposing signal maximum likelihood decoding, physical layer network coding and STBC coding; broadcast signal receiving and opposite side information restoring. The communication method based on MIMO-OFDM and physical layer network coding is advantageous in that network throughput of the communication system is increased, and the error rate of the communication system is reduced; compared with the traditional physical layer network coding, the throughput of the communication method of the invention is 1.5 times that of the traditional physical layer network coding; when the error rate BER is 10-5, the coding gain of the communication method of the invention is approximately 0.8dB.
Description
Technical field
The present invention relates to wireless communication technology field, be specifically related to the communication means based on MIMO-OFDM and physical-layer network coding.
Background technology
In a wireless communication system, there is the radio propagation path that many time delays are different between transmitter and receiver, cause multipath effect.When the maximum delay of multipath is greater than the code word duration, frequency selective fading can be caused.The multipath diffusion of signal causes intersymbol interference (Inter Symbol Interference intersymbol interference is called for short ISI), and causes the error rate in transmitting procedure to raise.And OFDM (Orthogonal Frequency Division Multiplexing OFDM, being called for short OFDM) serial data of high-speed transfer can convert to the low speed data of multidiameter delay by technology, and be modulated in relatively independent orthogonal sub-carriers and transmit, the temporal dispersion that in wireless channel, multidiameter delay produces is weakened the impact that communication system causes, improves the antijamming capability of communication system.
For SISO(Single Input Single Output single-input single-output, be called for short SISO) system, its throughput still cannot meet the demand of Modern wireless communication, and in theory proved MIMO(Multiple Input Multiple Output multiple-input and multiple-output at present, and being called for short MIMO) technology greatly can improve performance and the capacity of wireless communication system.
Physical-layer network coding can make network throughput improve 50% and 100% respectively than straight-forward network coding transmission pattern and conventional information transmission mode, and the rate of information throughput also improves 50% and 100% respectively, and these all show the superiority of physical-layer network coding.In order to further expand the throughput of communication network and improve the rate of information throughput, the Novel Communication technology that exploration MIMO-OFDM and physical-layer network coding merge mutually is very necessary.
Summary of the invention
The present invention is intended to the performance improving wireless communication system further, improves the network throughput of communication system, reduces the error rate of communication system, the invention provides the communication means based on MIMO-OFDM and physical-layer network coding.
For solving above technical problem, technical scheme of the present invention is:
Based on the communication means of MIMO-OFDM and physical-layer network coding, it is characterized in that it comprises the following steps:
Step one: source node A and source node B generates signal at first time slot and goes out from different antenna transmissions after sign map, serioparallel exchange, OFDM modulation and STBC encoder respectively successively, and source node A is identical for the number of antennas transmitted with source node B.
Step 2: via node utilizes the signal launched in antenna receiving step one, and Received signal strength superposition is obtained mixed signal.
Step 3: described mixed signal, successively through maximum likelihood decoder, physical-layer network coding and STBC coder processes, generates broadcast singal, described broadcast message gone out in second slot transmission.
Step 4: source node A and source node B receives described broadcast message respectively, the information that source node A and source node B utilizes the signals revivification broadcast singal in respective buffer memory to send to obtain Correspondent Node respectively, completes primary information and exchanges.
Concrete, in step one, source node A and source node B is all operated in semiduplex mode, and source node A is identical with the signal transmission power of source node B.
Concrete, use inverse discrete Fourier transform (Inverse Discrete Fourier Transform inverse discrete Fourier transform is called for short IDFT) to realize the serioparallel exchange of signal in step one.
Concrete, in step 2, via node is consistent for the number of antennas transmitted with source node A or source node B for the number of antennas of Received signal strength.
Concrete, the communication means based on MIMO-OFDM and physical-layer network coding is used for the bidirectional relay system mode extracted by unmanned plane netting communication system.
Beneficial effect of the present invention: communication means of the present invention have employed STBC encoder by OFDM modulation and MIMO technological incorporation at first time slot (i.e. multiple access access phase) of bidirectional relay system mode, gather the advantage of OFDM modulation and MIMO technology, after via node reception, superposed signal, maximum-likelihood decoding is adopted to complete the mapping of physical-layer network coding.The present invention not only increases the network throughput of communication system, and reduces the error rate of communication system.Compared with conventional physical network code, communication means throughput of the present invention is about 1.5 times of conventional physical network coding communication technology; Work as the error rate
bERbe 10
-5time, the coding gain of communication means of the present invention is about 0.8dB.
Accompanying drawing explanation
Fig. 1 is traffic model schematic diagram of the present invention.
Fig. 2 is the change curve of the error rate with signal to noise ratio.
Fig. 3 is the change curve of communication network throughput with signal to noise ratio.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1, the traffic model of embodiment is in order to illustrate the principle based on the physical layer network coding technique of MIMO-OFDM, and the mapping ruler of design physical-layer network coding, studies the performance of physical-layer network coding under this technology.The concrete steps of the communication means of embodiment are as follows:
Step one: source node A and source node B generates source signal respectively at first time slot, source signal forms baseband signal through sign map, IDFT is used to be N number of subsignal by each baseband signal serioparallel exchange, N number of subsignal, after OFDM modulation and STBC encoder, is launched by different antennas successively.Source node A and source node B is N number of for the number of antennas transmitted.
Step 2: N number of subsignal is received by via node by N number of reception antenna at via node place, Received signal strength superposes to obtain mixed signal by via node.
Step 3: mixed signal channel estimation successively, combining channel and maximum likelihood decoder also obtain decoded signal, decoded signal is through physical-layer network coding and STBC coder processes and obtain broadcast singal, broadcast message is launched in second time slot (i.e. broadcast phase).
Step 4: source node A and source node B respectively receiving broadcasting information and to receive broadcast singal carry out STBC decoding, obtain the estimated value of broadcast singal, the estimated value of broadcast singal is carried out xor operation to obtain counter-party information with local code word respectively, completes primary information and exchange.Source node A is identical with the information exchange system of source node B, the information of source node B is obtained for source node A, source node A receiving broadcast signal also carries out STBC decoding to it, source node A utilizes the local code word reduction in its buffer memory through the broadcast singal of STBC decoding, the final information obtaining source node B and send.
The communication means of the present embodiment is applicable to the bidirectional relay system mode extracted by unmanned plane netting communication system.
In the present embodiment, step one source node A and source node B is all operated in semiduplex mode, and source node A is identical with the signal transmission power of source node B.In the present embodiment, in step one two source nodes send 200000 0 at random to via node, 1 code; Channel in each step is additive white Gaussian noise channel, and namely noise variance is
, bilateral power spectral density is
channel.
Through emulation experiment, communication means of the present invention compared with the communication means of conventional physical network code, the error rate
bERwith signal to noise ratio
sNRchange curve as shown in Figure 2.In Fig. 2, abscissa represents signal to noise ratio
sNR, its scope is [0,10] dB; Ordinate represents the error rate
bER, its scope is [10
-6, 10
0].As shown in Figure 2, the error rate of communication means of the present invention
bERlower than the error rate of conventional physical network coding communication
bER; Work as the error rate
bERbe 10
-5time, the coding gain of communication means of the present invention is about 0.8dB.
Through emulation experiment, communication means of the present invention is compared with the communication means of conventional physical network code, and network throughput is with signal to noise ratio
sNRchange curve as shown in Figure 3.In Fig. 3, abscissa represents signal to noise ratio
sNR, its scope is [0,10] dB; Ordinate represents throughput, and its scope is [0,600].As shown in Figure 3, compared to conventional physical network coding communication technology, communication means throughput of the present invention is about 1.5 times of conventional physical network coding communication technology, and the communication performance of communication means of the present invention gets a promotion.
The above execution mode is only the preferred embodiments of the present invention, and and the feasible enforcement of non-invention exhaustive.For persons skilled in the art, to any apparent change done by it under the prerequisite not deviating from the principle of the invention and spirit, all should be contemplated as falling with within claims of the present invention.
Claims (5)
1., based on the communication means of MIMO-OFDM and physical-layer network coding, it is characterized in that it comprises the following steps:
Step one: source node A and source node B generates signal at first time slot and goes out from different antenna transmissions after sign map, serioparallel exchange, OFDM modulation and STBC encoder respectively successively, and source node A is identical for the number of antennas transmitted with source node B;
Step 2: via node utilizes the signal launched in antenna receiving step one, and Received signal strength superposition is obtained mixed signal;
Step 3: described mixed signal, successively through maximum likelihood decoder, physical-layer network coding and STBC coder processes, generates broadcast singal, described broadcast message gone out in second slot transmission;
Step 4: source node A and source node B receives described broadcast message respectively, the information that source node A and source node B utilizes the signals revivification broadcast singal in respective buffer memory to send to obtain Correspondent Node respectively, completes primary information and exchanges.
2. the communication means based on MIMO-OFDM and physical-layer network coding according to claim 1, it is characterized in that in step one, source node A and source node B is all operated in semiduplex mode, source node A is identical with the signal transmission power of source node B.
3. the communication means based on MIMO-OFDM and physical-layer network coding according to claim 2, is characterized in that using IDFT to realize the serioparallel exchange of signal in step one.
4. the communication means based on MIMO-OFDM and physical-layer network coding according to claim 3, is characterized in that in step 2, via node is consistent for the number of antennas transmitted with source node A or source node B for the number of antennas of Received signal strength.
5. the communication means based on MIMO-OFDM and physical-layer network coding as claimed in any of claims 1 to 4, is characterized in that the bidirectional relay system mode of described communication means for being extracted by unmanned plane netting communication system.
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| CN105610546A (en) * | 2015-12-23 | 2016-05-25 | 中国人民解放军军械工程学院 | Communication method based on SC-FDE (single carrier frequency domain equalization) and physical layer network coding |
| CN105680986A (en) * | 2015-12-23 | 2016-06-15 | 中国人民解放军军械工程学院 | Communication method based on LDLC (Low Density Lattice Code) and physical layer network coding |
| CN106357313A (en) * | 2016-10-14 | 2017-01-25 | 哈尔滨工业大学深圳研究生院 | Method for calculating interruption probability of MIMO (Multiple Input Multiple Output) relay channel for unmanned aerial vehicle (UAV) communication |
| CN114337924A (en) * | 2021-12-28 | 2022-04-12 | 福州大学 | Mapping design method under physical layer network coding |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610546A (en) * | 2015-12-23 | 2016-05-25 | 中国人民解放军军械工程学院 | Communication method based on SC-FDE (single carrier frequency domain equalization) and physical layer network coding |
| CN105680986A (en) * | 2015-12-23 | 2016-06-15 | 中国人民解放军军械工程学院 | Communication method based on LDLC (Low Density Lattice Code) and physical layer network coding |
| CN106357313A (en) * | 2016-10-14 | 2017-01-25 | 哈尔滨工业大学深圳研究生院 | Method for calculating interruption probability of MIMO (Multiple Input Multiple Output) relay channel for unmanned aerial vehicle (UAV) communication |
| CN106357313B (en) * | 2016-10-14 | 2019-08-09 | 哈尔滨工业大学深圳研究生院 | MIMO trunk channel outage probability calculation method towards UAV Communication |
| CN114337924A (en) * | 2021-12-28 | 2022-04-12 | 福州大学 | Mapping design method under physical layer network coding |
| CN114337924B (en) * | 2021-12-28 | 2023-08-04 | 福州大学 | Mapping design method under physical layer network coding |
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