Computer Science ›› 2016, Vol. 43 ›› Issue (11): 130-134.doi: 10.11896/j.issn.1002-137X.2016.11.025

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Design of Multicast Code Division Multiple Access Information System Based on Cooperative Relay

LV Min-hui, XIONG Wei and SHEN Lai-xin   

  • Online:2018-12-01 Published:2018-12-01

Abstract: In order to improve the performance of multigroup multicast relay network system,an improved cooperative relay multipoint broadcast code division multiple access(CDMA) system was proposed.In this scheme,the distributed beamforming based on cooperative relaying is used to realize the multicast of single antenna base station,and a better spatial diversity gain is obtained.In this system,a plurality of base stations use multiple relay nodes to multiple destinations in each group to spread the news.CDMA techniques are used to reduce the relay node and the multiple access interference(MAI) barrier of the destination node.Each relay node as a linear precoding beamformer can reshape the space base station signal in the appropriate code.The linear beamforming matrix is optimized to make the power relay nodes minimize,so as to meet the requirements of QoS in signal to interference noise ratio.Through the contrast experiment,the performance of the system simulation shows that the proposed scheme outperforms the conventional orthogonal multiplexing scheme(FDMA / TDMA).

Key words: CDMA,Multicast,QoS,Cooperative relay

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