异构网络中协作多点鲁棒性波束成形设计

摘要

异构网络可以极大提高第5代移动通信系统的性能,但是不同的低功率节点却使得整个网络中小区间的干扰变得更加复杂,已有的干扰协调技术已经不是解决此类干扰问题的最优方法.将协作多点(CoMP)传输技术引入异构网络可以消除不同小区间的干扰,但是,由于基站间的回程链路存在开销时延以及信道的估计、量化过程均存在误差,干扰消除效果变差.为了减小3种非理想因素对干扰消除的影响,考虑了信道估计误差、量化误差和基站间协作开销时延,设计了收发联合的鲁棒性波束成形.通过Matlab仿真结果表明,相较于传统的块对角化波束成形算法,该算法更好地消除了小区间干扰,系统的吞吐量和误码率性能得到明显改善.%Heterogeneous networks can improve the performance of the fifth generation mobile communication system greatly,but the introduced different low power nodes make the interference of the whole networks more complex,the existed interference coordinated technology has not solve this kind interference problems.Coordinated multi-point (CoMP) transmission technology in heterogeneous networks can eliminate the interference between different cells,however,because of the overhead delay in backhaul link,the channel estimation error and quantization error,the interference cancelation effect may be affected.In order to reduce the influence of this three kinds of non-ideal factors,according to the channel estimation error,quantization error and overhead delay between base stations,we design a transceiver combined robust beamforming algorithm.The Matlab simulation results show that compared to the traditional block diagonalization beamforming,the proposed algorithm can eliminate the inter-cell interference better,and the system throughput and bit error rate can improved significantly.