Spot diffusing angle diversity MC-CDMA optical wireless system
Spot diffusing angle diversity MC-CDMA optical wireless system
复制标题
点扩散角分集MC-CDMA光无线系统
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Elmirghani
中科院分区：
文献类型：
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作者：
F. Alsaadi;J. Elmirghani
多载波码分多址（MC-CDMA）结合了正交频分复用（OFDM）和CDMA的一些期望特征，因为它以降低的信道速率提供多用户能力。分析了带限光无线信道下的MC-CDMA系统。此外，作者评估的性能时，一条线带多波束系统（LSMS）是结合使用的角度分集接收机在OW MC-CDMA系统。结果表明，在误码率为10 - 4的情况下，与单用户OW开关键控系统和4用户OW CDMA系统相比，在4用户系统中采用MC-CDMA可分别获得7 dB和10 dB的信噪比改善。这种改进是通过实现多用户通信来获得的。随着用户数量的增加，性能逐渐下降。与传统的漫射OW系统（CDS）相比，LSMS和角度分集的使用在给定的室内几何结构上提供更均匀的SNR。结果报告的角度分集LSMS MC-CDMA系统，并进行比较的CDS MC-CDMA系统。
Multi-carrier code division multiple access (MC-CDMA) combines some of the desirable features of orthogonal frequency-division multiplexing (OFDM) and CDMA in that it offers multi-user capabilities at a reduced channel rate. The authors report the analysis of a MC-CDMA system over the bandlimited optical wireless (OW) channel. Furthermore, the authors evaluate the performance when a line strip multibeam system (LSMS) is used in conjunction with an angle diversity receiver in the OW MC-CDMA system. The results indicate that at a bit error rate of 10 -4 a 7 and 10 dB signal-to-noise ratio (SNR) improvements are obtained through the use of MC-CDMA in a 4-user system when compared to a single-user OW on off keying system and a 4-user OW CDMA system, respectively. This improvement is obtained by enabling multi-user communication. The performance degrades gradually with increase in the number of users. The use of LSMS and angle diversity offers a more uniform SNR over a given indoor geometry compared to a conventional diffuse OW system (CDS). Results are reported for an angle diversity LSMS MC-CDMA system and are compared to the CDS MC-CDMA system.