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Low-complexity detection method based on channel matrix periodic N-diagonal equivalence for uplink MU-MIMO of multi-beam satellite communication systems
International Journal of Satellite Communications and Networking ( IF 0.9 ) Pub Date : 2021-05-06 , DOI: 10.1002/sat.1398 Feng Zhu 1 , Teer Ba 1 , Yuan Zhang 1 , Xiqi Gao 1 , Shenghua Zhai 2 , Xianfeng Gong 2
International Journal of Satellite Communications and Networking ( IF 0.9 ) Pub Date : 2021-05-06 , DOI: 10.1002/sat.1398 Feng Zhu 1 , Teer Ba 1 , Yuan Zhang 1 , Xiqi Gao 1 , Shenghua Zhai 2 , Xianfeng Gong 2
Affiliation
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In this paper, a low-complexity detection method for uplink Multi-User Multiple-Input Multiple-Output (MU-MIMO) of multi-beam satellite communication systems is studied. Firstly, we derive the uplink receiving system model and give the beam-domain channel expression. Utilizing the characteristics of energy concentration of uplink channel in beam domain, we propose that the channel matrix can be equivalent to periodic N-diagonal matrix, which can reduce the number of channel estimations and reduce the computational complexity of detection. Then, based on the beam-domain channel matrix equivalent model, two low-complexity minimum mean square error (MMSE) detection methods are proposed to reduce the computational complexity of traditional MMSE detection from 
to O(K). Simulation results show that the proposed methods have limited performance loss compared with the traditional methods.
中文翻译：
基于信道矩阵周期N对角线等价的多波束卫星通信系统上行MU-MIMO低复杂度检测方法
本文研究了一种低复杂度的多波束卫星通信系统上行多用户多输入多输出(MU-MIMO)检测方法。首先推导上行接收系统模型，给出波束域信道表达式。利用波束域上行信道能量集中的特点，我们提出信道矩阵可以等价于周期性的N-对角矩阵，这样可以减少信道估计的次数，降低检测的计算复杂度。然后，基于波束域信道矩阵等效模型，提出了两种低复杂性最小均方误差（MMSE）检测方法来从减少传统MMSE检测的计算复杂度来Ö（克）。仿真结果表明，与传统方法相比，所提出的方法具有有限的性能损失。
更新日期：2021-05-06
to O(K). Simulation results show that the proposed methods have limited performance loss compared with the traditional methods.
中文翻译：
基于信道矩阵周期N对角线等价的多波束卫星通信系统上行MU-MIMO低复杂度检测方法
本文研究了一种低复杂度的多波束卫星通信系统上行多用户多输入多输出(MU-MIMO)检测方法。首先推导上行接收系统模型，给出波束域信道表达式。利用波束域上行信道能量集中的特点，我们提出信道矩阵可以等价于周期性的N-对角矩阵，这样可以减少信道估计的次数，降低检测的计算复杂度。然后，基于波束域信道矩阵等效模型，提出了两种低复杂性最小均方误差（MMSE）检测方法来从减少传统MMSE检测的计算复杂度
来Ö（克）。仿真结果表明，与传统方法相比，所提出的方法具有有限的性能损失。
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