Signal detecting method for multi-antenna two-way relay channel
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A two-way relay and signal detection technology, applied in the shaping network of the transmitter/receiver, baseband system components, etc., can solve the problems of low throughput, high bit error rate, low computational complexity, etc., and achieve system Effects of Bit Error Rate and Throughput Improvement and Computational Complexity Reduction
Inactive Publication Date: 2012-09-12
SHANGHAI UNIV
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[0004] The purpose of the present invention is to provide a multi-antenna two-way relay channel signal detection method for the defects in the prior art, so as to solve the problems of small throughput, high bit error rate and high energy consumption in the two-way cooperative system, while maintaining lower computational complexity
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Embodiment 1
[0038] like figure 1 As shown, the signal detection method of the multi-antenna bidirectional relay channel is: in the typical relay system model of physical layer network coding, the bidirectional relay channel system model is the most widely used one. Information exchange takes place with the help of relay nodes. The source nodes S1 and S2 are both equipped with a single antenna, while the relay node R uses multiple antennas to receive signals from the source node.
[0039] like figure 2 As shown in the two-way relay channel system, the flow chart of the relay node processing a request packet is divided into the following steps to achieve:
[0040] a) In a two-way relay system, the source node (S1, S2) sends its own data packets to the relay node (R) at the same time in the multiple access phase, and the relay node R uses multiple antennas to receive the signal from the source node. ;
[0041] b) Relay node signal processing: The joint detection interference cancellatio...
Embodiment 2
[0043] Embodiment two: This embodiment is basically the same as the first embodiment, and the special features are as follows:
[0044]The relay node signal processing is realized from the following two aspects:
[0045] a) Joint detection and interference cancellation algorithm, that is, the algorithm of joint minimum mean square error detection and parallel interference cancellation. This method is implemented in two steps:
[0046] The first step is to pass the received signal through a minimum mean square error detector:
[0047]
[0048] In the formula, Represents the signal matrix of the relay terminal after the minimum mean square error detection, represents the signal value on each receive antenna, Represents the number of receiving antennas at the relay end, is the channel matrix from the source node (S1, S2) to the relay node (R), Represents the matrix of sent signals from source nodes, is the power spectral density of the noise in the channel;
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Abstract
The invention relates to a signal detecting method for a multi-antenna two-way relay channel. The method is characterized in that a physical layer network coding technology is adopted in the multi-antenna two-way relay channel, and the bit error rate of a system is reduced by adopting a combined detection and interference elimination algorithm and a combined modulation and demodulation scheme at a relay node. According to the combined detection and interference elimination algorithm, the conventional least mean-square error detection algorithm is applied to the multi-antenna two-way relay system, and the estimated value of source node transmitting signals, which is obtained by detection, is subjected to parallel interference elimination, so that mutual interference between the source node transmitting signals can be furthest reduced. In addition, a new combined modulation constellation mapping scheme is proposed at the relay node according to the modulation modes of two source nodes and based on the constellation point design criteria of minimum Euclidean distance maximization. Compared with a relay node signal processing scheme for completing information combination by using xor operation, the method under the asymmetrical transmission mode that different modulation modes are adopted at the two source nodes has the advantages that the minimum Euclidean distance between relay node broadcasting signals is prolonged, the bit error rate of the system is reduced, and the transmission reliability of a two-way cooperative communication system is improved.
Description
technical field [0001] The invention relates to a signal detection method of a multi-antenna two-way relay channel, which belongs to the technical field of wireless communication. Background technique [0002] The traditional communication network transmits data by store-and-forward, that is, nodes other than the sending node and receiving node of the data are only responsible for routing, without any processing of the data content, and the intermediate nodes play the role of forwarders. Network coding is an information exchange technology that combines routing and coding. Its core idea is that the intermediate nodes of the network perform linear or non-linear processing on the information received on each channel, and then forward it to the downstream nodes. The intermediate nodes act as role as an encoder or signal processor. [0003] In the field of wireless communication, network coding can not only be implemented in high-level layers such as data link layer and network...
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