| 摘要: |
| 在多输入多输出（Multiple-Input Multiple-Output，MIMO）无线通信中，信道衰落、随机噪声、空间多径效应和共信道干扰等因素会产生符号间干扰，造成接收端信号严重失真。为提高MIMO系统传输性能，有效减少信道中相位失真，提出了一种改进的非常数模半盲均衡方案(Non-constant Modulus Algorithm,NCMA)。该方案结合了MIMO信道先验知识对半盲均衡器的初始值进行预设，采用变步长迭代更新均衡器权系数，寻找到最小目标函数值。仿真结果表明，改进后的算法能通过控制变步长减小剩余稳态误差，加快收敛速度，改善信道均衡效果。 |
| 关键词: MIMO系统 信道均衡 半盲均衡 非常数模算法（NCMA） 变步长 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61661018）；海南省自然科学基金项目（2019RC036，619MS029，620MS020）；海南省高等学校科学研究项目（Hnky2019 8） |
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| A semi-blind equalization scheme of non-constant modulus in a MIMO system |
| XIAO Kexin,LI Hui,ZHOU Youling,WANG Ping,LIN Zhiyang |
| (School of Information and Communication Engineering,Hainan University,Haikou 570228,China;1.School of Information and Communication Engineering,Hainan University,Haikou 570228,China;
2.Nanjing University of Information Science and Technology Binjiang College,Wuxi 214105,China;School of Information and Communication Engineering,Hainan University,Haikou 570229,China;School of Information and Communication Engineering,Hainan University,Haikou 570230,China) |
| Abstract: |
| In multiple-input multiple-output(MIMO) wireless communication,factors such as channel fading,random noise,spatial multipath effect,and co-channel interference can produce inter-symbol interference(ISI),which causes serious signal distortion in the receiving terminal.In order to improve the transmission performance in a MIMO system,effectively reduce the phase distortion in the channel,an improved semi-blind equalization scheme of Non-constant Modulus Algorithm(NCMA) is proposed.This scheme combines the prior knowledge of the MIMO channel,presets the initial value of the semi-blind equalizer,uses variable step-size to iterate and update the weight coefficients of the equalizer,and finds the minimum objective function value.The simulation results show that the improved algorithm can reduce the residual steady-state error,accelerate the convergence speed,and improve the channel equalization effect by controlling the variable step-size. |
| Key words: MIMO system channel equalization semi-blind equalization non-constant modulus algorithm(NCMA) variable step-size |
