Research On System Performance Analysis And Power Allocation Based On2-hop Cooperative Communication System

With the popularity of3G wireless networks and the arrival of4Gcommunication systems, wireless communication technology has changed the way ofour life fundamentally. Cooperative relay communication is an important technologyof wireless communication field. By this technology the single can be transmittedthrough a virtual single antenna between each of nodes, effective against multi-path.When multiple nodes cooperative transmission, this technology can increase thespatial diversity gain, in order to increase system capacity.At present, the relay cooperative communication technology research problems,the BER of the system, resource allocation problem analysis, etc. From cooperativerelay system performance analysis, this paper on the system bit error rate underdifferent forwarding agreement, then introduce the compressed sensing in channelestimation, the application of the final joint power allocation for relay coordinationsystem for channel estimation. The main research content is as follows:First of all, the problem of collaboration relay communication system model isanalyzed, which based on Amplify and Forward (AF) protocol and Decode andForward (DF) agreement, single relay system and relay system in bit error rateformula is derived respectively. The simulation of the BER under different relayprotocols comparison chart.Secondly, the compressed sensing theory is introduced. Its theory knowledge isintroduced from the compressed sensing of sampling refactoring, and then we apply itto the channel estimation. In channel estimation, the application of compressedsensing algorithm compared with the traditional algorithm, it is concluded that whenwe use the CS, we can estimate the same channel performance but requires less pilot.Finally, the problem of the cooperative relay communication power allocation isstudied. And based on the maximum system capacity and minimum average error rate,an optimal power solution is proposed. In the classic average power allocation scheme, the distributed space-time coding and the orthogonal space-time coding of44are used in the relay, and distributed power between the source node and relaynode, then channel estimation at the destination. The simulation shows: the estimateis superior than the random power allocation under the channel estimation.