Beamforming with Relays in Heterogeneous Networks Based on Correlation Knowledge
Considering a network with a frequency reuse one where intercell interference is a limiting factor,an unfair distribution of the signal-to-interference-plus-noise ratio (SINR) for different users results.A method to improve the SINR is fair multicell max–min beamforming (MBF).In addition to intercell interference,shadow fading is another performance limiting factor.Strongly shadowed users can decrease the performance of all jointly scheduled users if fairness is desired.To overcome this shadow fading effect,this paper investigates one-way halfduplex decode-and-forward relays in combination with MBF.The user is served only by the relay in the second hop and in the first hop only BS transmits the signal to the relay.In large networks,obtaining instantaneous channel state information (CSI) is difficult,therefore,the algorithm proposed in this paper is based on long-term CSI in the form of correlation knowledge.In addition to sum rate performance energy efficiency becomes a much more important issue.This paper proposes an algorithm which can achieve a higher performance as networks without relays with 20%reduced transmit power.
Multiuser max-min beamforming decode-andforward relays long-term CSI
Guido Dartmann Xitao Gong Gerd Ascheid
Chair for Integrated Signal Processing Systems, RWTH Aachen University, Germany
国际会议
2012 IEEE 14th International Conference on Communication Technology(2012年第十四届通信技术国际会议(ICCT 2012))
成都
英文
644-648
2012-11-09（万方平台首次上网日期，不代表论文的发表时间）