CAJ | 학술논문

该文研究频率选择性信道中多用户点对点分布式中继网络波束形成技术。为了均衡源节点与中继节点以及中继节点与目标节点之间的频率选择性信道，该文提出的波束形成技术在中继节点上采用有限长响应滤波器和滤波而后转发的中继数据传输方法，以最小化中继节点的发射总功率为目标，同时满足所有目标节点的服务质量(QoS)。该波束形成优化问题的直接形式由于其非凸性而难以求得最优解。该文采用半定松弛(SDP)方法将其近似为凸优化问题，进而可以用内点法高效快速求解。仿真结果表明，相较于传统的放大而后转发的波束形成技术，所提波束形成方法能有效提高频率选择性信道中多用户中继网络的性能。
해문연구빈솔선택성신도중다용호점대점분포식중계망락파속형성기술。위료균형원절점여중계절점이급중계절점여목표절점지간적빈솔선택성신도，해문제출적파속형성기술재중계절점상채용유한장향응려파기화려파이후전발적중계수거전수방법，이최소화중계절점적발사총공솔위목표，동시만족소유목표절점적복무질량(QoS)。해파속형성우화문제적직접형식유우기비철성이난이구득최우해。해문채용반정송이(SDP)방법장기근사위철우화문제，진이가이용내점법고효쾌속구해。방진결과표명，상교우전통적방대이후전발적파속형성기술，소제파속형성방법능유효제고빈솔선택성신도중다용호중계망락적성능。
In this paper, a distributed peer-to-peer beamforming technique in frequency-selective relay networks is proposed. It is assumed that all the relay nodes use Filter-and-Forward (FF) protocol to compensate for the source-to-relay and relay-to-destination channels. All the channels of the active source-destination pairs are considered to be frequency-selective. The beamforming strategy that minimizes the total relay transmitted power subject to the Quality-of-Service (QoS) constraints for all of the destination nodes is considered. The resultant problem is approximately solved using Semi-Definite Programming (SDP). Simulation results demonstrate that in frequency-selective multiuser relay networks, the proposed technique substantially outperforms the existing amplify-and-forward peer-to-peer beamforming methods.