Spreading sequences for uplink and downlink MC-CDMA systems: PAPR and MAI minimization
Spreading sequences for uplink and downlink MC-CDMA systems: PAPR and MAI minimization
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DOI：
10.1002/ett.4460130507
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发表时间：
2002-09
期刊：
影响因子：
--
通讯作者：
S. Nobilet;J. Hélard;D. Mottier
中科院分区：
文献类型：
--
作者：
S. Nobilet;J. Hélard;D. Mottier
本文研究了多载波码分多址（MC-CDMA）系统下行和上行的扩频序列选择问题，以减小传输多载波信号包络的动态范围和减小多址干扰。对MC-CDMA下行和上行相移键控传输的正交序列和非正交序列的波峰因子进行了分析和仿真比较。然后，为了使选频信道产生的多址干扰最小化，提出了一种优化的扩频序列分配方法。最后，针对下行链路的MC-CDMA系统，提出了一种能够共同降低多址干扰和波峰系数的扩展码选择方法。
This paper deals with spreading sequences selection for downlink and uplink Multi-Carrier Code Division Multiple Access (MC-CDMA) systems with the aim of minimizing the dynamic range of the transmitted multicarrier signal envelope and the multiple access interference. The crest factor of orthogonal and non-orthogonal sequences are compared analytically and by simulation for downlink and uplink phase shift keying MC-CDMA transmissions. Then, in order to minimize the multiple access interference produced by frequency selective channels, an optimized spreading sequence allocation procedure is presented. Finally, a selection of the spreading codes which jointly reduces the multiple access interference and the crest factor is proposed for downlink MC-CDMA systems.