计算机技术与发展2017，Vol.27Issue(3)：155-158,4.DOI:10.3969/j.issn.1673-629X.2017.03.032
基于NCLMS的QPSK-PCMA系统仿真分析
Simulation and Analysis of NCLMS-based QPSK-PCMA System
摘要
Abstract
PCMA ( Paired Carrier Multiple Access) allows up and down links to use the same spectrum at the same time,which can great-ly improve the spectrum efficiency and has important significance in satellite communications. As QPSK is commonly used in satellite communications,a self-interference cancellation method based on NCLMS ( Normalized Complex Least Mean Square) is proposed. The dividing frequency slot technique and the Early-Prompt-Late technique for accurate time delay estimation are used respectively in the coarse and precise estimation stages of the frequency and time delay. The effect of NCLMS learning step and NCLMS loop FIR ( Finite Impulse Response) taps number on self-interference cancellation is mainly investigated and simulated with Matlab. The simulation results show that the step length for NCLMS self-adaptive learning will impress the results of self-interference cancellation,comparing with 216 the step length of 212 having made SNR deteriorated about 1. 4 dB,and that PCMA performance is good enough for self-interference can-cellation with five NCLMS loop FIR filter taps,thus there is no need to increase filter taps number.关键词
卫星通信/载波成对多址接入/自干扰抵消/归一化最小均方误差Key words
satellite communications/PCMA/self-interference cancellation/NCLMS分类
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黄波..基于NCLMS的QPSK-PCMA系统仿真分析[J].计算机技术与发展,2017,27(3):155-158,4.基金项目
江苏省产学研前瞻性研究项目(BY2015011-01) （BY2015011-01）
南京邮电大学引进人才启动基金(NY211036) （NY211036）
