Multi-access interference suppression in DS/FH communication system
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摘要: 根据DS-CDMA(Direct Sequence Code Division Multi-Access)系统中多用户检测的思想,分析了并行干扰抵消PIC(Parallel Interference Cancellation)对系统性能的影响,在此基础上,提出了采用部分并行干扰抵消PPIC(Partial Parallel Interference Cancellation)技术来抑制DS/FH SSMA(Direct Sequence/Frequency Hopping Spread Spectrum Multi-Access)混合系统中的多址干扰MAI ( Multi-Access Interferences).推导了闭环形式的误码率公式,得到系统性能评估的上限表达式.仿真结果表明,采用PPIC技术可有效的提高DS/FH SSMA系统的抗多址干扰的能力,因而可以提高系统的容量.仿真是建立在AWGN信道下的,对于衰落信道和低信噪比环境下,系统的性能会有一定程度的降低.Abstract: According to the thought of multi-users detection(MUD)used in direct sequence code division multi-access (DS-CDMA) system, partial parallel interference cancellation(PPIC) technology was put forward to suppress multi-access interference(MAI) in direct sequence/frequency hopping spread spectrum multi-access(DS/FH SSMA)after analyzing the effect on system performance by parallel interference cancellation(PIC). Bit error rate(BER) closed expression was deduced and up-limited expression of system performance estimation was also acquired. Simulation results demonstrate that PPIC technology can suppress MAI effectively in DS/FH SSMA, and system capacity can be improved. The simulation was accomplished under AWGN, system performance will deteriorates to some extent under fading channel and low signal noise ratio(SNR)condition.
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[1] Patel P, Holtzman J. Analysis of a simple successive interference cancellation scheme in a DS-CDMA system [J]. IEEE Journal on Selected Areasin Communications, 1994, 12(5):796~807 [2]Kim J H,Kim S W. Partial successive interference cancellation in hybrid DS/FH spread spectrum multiple-access systems[J]. IEEE Trans on Communications, 2001,49(10):1710~1714 [3]Michael B R,Michael B,Steven P N. Comment on partial parallel interference cancellation for CDMA[J]. IEEE Transactions on Communications,1999, 47(5):658~661 [4]Gao Xue,Li Chengshu. Performance of partial parallel interference cancellation in DS-CDMA system with delay estimation error . PIMRC2000 .London, 2000.724~727 -
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