摘要
目前,60 GHz毫米波通信标准(802.11.ad,802.15.3c)中采用基于码本的波束成形技术,其性能仍有提升空间且在天线数较大时,搜索复杂度较高。该文基于以上两点提出了一种贪婪迭代的波束成形方法。首先寻找最佳分区中的中心波束作为初值,然后逐次在每根天线上选取移相器可能取值(1,-1,i,-i)中的最优值作为权重值,最后在收发端进行迭代,直至算法收敛。仿真表明,该方法不仅能够获得更高的频谱效率,同时具有线性复杂度,在毫米波阵列天线数较多时具有较大的优势。
Currently, beamforming in 60 GHz millimeter-wave communication standard （802. 11. ad, 802. 15.3c） is based on the codebook, its performance is not optimal and has a square complexity, when the number of antennas is large, the search complexity is high. In this paper, based on the above two we proposed a greedy iterative beamforming method to im- prove the performance. First, we find a suitable sector and choose the central beam in the sector as the initial weight vector and then successively select the optimal value on each antenna phase shifter from possible values （1, -1, i, -i） based on the received SNR, and finally, iterate between sending and receiving end until the algorithm converges. Simulation results show that the proposed method can obtain a higher spectrum efficiency than the codebook based method, and compared with the square complexity of the IEEES02. 15.3c, the proposed method has a linear complexity, which has a large advantage when the number of millimeter-wave array antenna is large.
出处
《信号处理》
CSCD
北大核心
2017年第5期669-675,共7页
Journal of Signal Processing
基金
国家自然科学基金(61401447)
通信网信息传输与分发技术重点实验室开放课题(KX152600016/ITD-U15007)
