毫米波massive MIMO系统中混合连接的混合预编码设计

doi:10.11959/j.issn.1000-436x.2020057

Abstract

Abstract:

In order to improve the spectral efficiency of hybridly-connected hybrid precoding,the optimal hybrid precoding matrix under the ideal conditions was firstly obtained by using the principle of successive interference cancellation (SIC).Secondly,the optimal hybrid precoding matrix was decomposed into the digital precoding matrix and the analog precoding matrix by using the gradient descent theory.Finally,considering the constant modulus constraint condition of the analog precoding matrix,the digital and analog precoding matrices were optimized by using the alternating minimization method aim to maximize the spectral efficiency.Due to the hybridly-connected structure,the proposed hybrid precoding design algorithm is significantly superior to the partially-connected and fully-connected hybrid precoding in terms of the system energy efficiency.Meanwhile,the algorithm does not increase any hardware complexity and only increases a small amount of computation of the hybridly-connected hybrid precoding.Computer simulation results exhibit that the proposed algorithm can improve the system spectral efficiency of the hybridly-connected hybrid precoding,and the upgrade of spectral efficiency is more significant especially in the conditions that the number of radio frequency (RF) links is greater than the number of data streams.Since the sub-blocks are not necessary to satisfy orthogonality conditions,the proposed algorithm is more suitable for practical application than the existing hybridly-connected hybrid precoding.

Key words: massive MIMO, hybrid precoding, hybridly-connected structure, gradient descent theory

CLC Number:

TN911

Hongyu ZHAO,Hongyan YAO. Design of hybridly-connected hybrid precoding in millimeter-wave massive MIMO system[J]. Journal on Communications, 2020, 41(3): 45-52.

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References 19

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信噪比/dB	最优频谱效率/(bit·(s·Hz)^-1)	文献[9]算法/(bit·(s·Hz)^-1)	本文算法/(bit·(s·Hz)^-1)
-30	0.163 9	0.134 3	0.139 5
-20	1.425 0	1.195 5	1.237 0
-10	7.425 5	6.610 8	6.756 1
0	20.104 8	18.840 7	19.067 7
10	37.179 9	35.749 7	35.985 1
20	57.421 5	55.884 6	56.141 9
30	80.291 9	78.821 4	79.050 8

发射天线数/根	最优频谱效率/ (bit·(s·Hz)^-1)	文献[9]算法/(bit·(s·Hz)^-1)	本文算法/(bit·(s·Hz)^-1)
2⁴	8.562 7	8.253 8	8.437 4
2⁵	12.146 4	11.367 5	11.703 8
2⁶	16.026 4	14.946 0	15.258 5
2⁷	20.107 5	18.839 8	19.069 5
2⁸	24.083 4	22.726 7	22.837 2
2⁹	28.013 1	26.619 9	26.641 9

Design of hybridly-connected hybrid precoding in millimeter-wave massive MIMO system

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