A Multi-Relay Two-Hop Transmission Method Based on Interference Alignment and Beamforming
A technology of beamforming and interference alignment, which is applied in the field of anti-interference transmission mechanism, can solve problems such as high system complexity, difficult implementation, and heavy load at the relay, achieve high system capacity and energy efficiency, reduce mutual interference, The effect of reducing complexity
Active Publication Date: 2016-08-10
CHONGQING UNIV OF POSTS & TELECOMM
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[0006] In these schemes, in order to achieve interference-free transmission of the system, interference alignment must be performed between the source end and the relay end, and between the relay end and the destination end, that is, the relay must simultaneously obtain the Channel information, and complex receiving precoding and sending precoding design, the processing complexity of the relay is very high
Due to its transmission mechanism, the load on the relay is heavy, and the relay becomes a bottleneck. In addition, the complexity of the entire system is also large, and it takes up more resources. It is difficult to implement in the actual wireless communication environment.
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[0026] The present invention proposes a two-hop transmission mechanism, that is, a two-hop transmission mechanism based on interference alignment and beam transmission, for the network environment where normal communication cannot be performed due to factors such as interference, fading, and long communication distance. Shaped multi-relay transport mechanism.
[0027] The present invention is directed to (T, K, g) networks. There are T user pairs (S i ,D i ,i=1,2,…T), at the source (S i ) and destination (D i ) are evenly distributed among g candidate relays, and the ith (i=1,2,...T) user pair selects K (K≤g) relays to form their respective relay groups according to a certain selection strategy to forward K independent data streams for it, user S i By beamforming the weight vector W ij (i=1,2,...T; j=1,2,...,K) K relays selected for it Send K independent data streams x ij , then the interference alignment vector V at the selected relay ij(i=1,2,...T; j=1,2,...,K) de...
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The invention discloses a method for multi-relay two-hop transmission based on interference alignment and beamforming, and can utilize anti-interference function of the interference alignment and beamforming technologies in wireless communication, as well as ability of relay technology on increasing system cover area. Aiming at the wireless transmission environment in which direct transmission cannot be conducted because the transmission distance is longer, or noise and interference exist in a system, a plurality of relays are arranged among a plurality of transmitting ends and a plurality of receiving ends; rotating priority relay choosing strategy, which is fairer and more reasonable, is adopted an the transmitting ends; the beamforming technology is adopted among the transmitting ends and the relays to realize efficient utilization of a frequency spectrum; and the improved interference alignment is adopted for the relays to transmit to the receiving ends, so that interference of a user to the system interior and of other users to the user is effectively eliminated, which realizes alignment and elimination of interference. Utilizing the transmission mechanism can reduce the complexity of the system, realize higher transmission rate of the wireless communication system, and meanwhile realize higher system energy efficiency.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to the anti-interference transmission mechanism applied when long-distance communication and channel quality are poor. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the number of terminal users in the wireless network has increased sharply, and the interference and fading in the communication environment have become increasingly serious, resulting in poor communication quality between cell edge users or long-distance users, so how to eliminate Interference and increasing the coverage of the system have important theoretical and practical significance. [0003] Interference Alignment technology, as an anti-interference technology that can double the system capacity, has attracted people's attention in recent years. It aligns the interference signals in the system by pre-designing precoding at the sending end, ove...
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IPC IPC(8): H04B7/14H04B7/06
CPCY02D30/70
Inventor 谢显中施赵媛雷维嘉
Owner CHONGQING UNIV OF POSTS & TELECOMM