An Iteration Based Beamforming Method for Planar Phased Array in Millimeter-Wave Communication

Junlin TANG  Guangrong YUE  Lei CHEN  Shaoqian LI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.4   pp.399-406
Publication Date: 2017/04/01
Online ISSN: 1745-1353
Type of Manuscript: PAPER
Category: Electromagnetic Theory
Keyword: 
millimeter-wave,  beamforming,  iteration,  phased array,  

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Summary: 
Nowadays, with the extensive use of smart devices, the amount of mobile data is experiencing an exponential growth. As a result, accommodating the large amount of traffic is important for the future 5G mobile communication. Millimeter-wave band, which has a lot of spectrum resources to meet the demand brought by the growth of mobile data, is becoming an important part of 5G technology. In order to mitigate the high path loss brought by the high frequency band, beamforming is often used to enhance the gain of a link. In this paper, we propose an iteration-based beamforming method for planar phased array. When compared to a linear array, a planar phased array points a smaller area which ensures a better link performance. We deduce that different paths of millimeter-wave channel are approximately orthogonal when the antenna array is large, which forms the basis of our iterative approach. We also discuss the development of the important millimeter-wave device-phase shifter, and its effect on the performance of the proposed beamforming method. From the simulation, we prove that our method has a performance close to the singular vector decomposition (SVD) method and is superior to the method in IEEE802.15.3c. Moreover, the channel capacity of the proposed method is at most 0.41bps/Hz less than the SVD method. We also show that the convergence of the proposed method could be achieved within 4 iterations and a 3-bit phase shifter is enough for practical implementation.