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引用次数: 3

摘要

比较了几种光码分多址相关接收机的性能。性能是根据未编码的吞吐量来衡量的。它被定义为在任意小的错误概率下所能达到的最大数据速率(以nat /芯片时间为单位)。考虑了开关键控(OOK)和脉冲位置调制(PPM) CDMA方案。签名代码关联由一个或两个限定。结果表明,将码相关约束从1增加到2,可以提高光PPM-CDMA系统的吞吐量。但是,OOK-CDMA系统的容量不能再增加。此外,码相关约束为2的PPM-CDMA系统的吞吐量大于码相关约束为1或2的OOK-CDMA系统的吞吐量。事实上,当脉冲位置多重性增加到无穷大时,PPM-CDMA系统相对于OOK-CDMA系统的吞吐量的改进接近10的限制因子。
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Uncoded throughput capacities of optical CDMA communication channels
A comparison between the performance of several optical code-division multiple-access (CDMA) correlation receivers is presented. The performance is measured in terms of an uncoded throughput capacity. It is defined as the maximum data rate (in nats/chip time) that can be achieved with arbitrary small error probability. Both on-off keying (OOK) and pulse-position modulation (PPM) CDMA schemes are considered. Signature code correlations bounded by either one or two are employed. Our results reveal that the throughput capacity of the optical PPM-CDMA systems can be increased by increasing the code-correlation constraint from one to two. That of OOK-CDMA systems, however, cannot be increased. Further, the throughput capacity of PPM-CDMA systems with code-correlation constraint of two is greater than that of OOK-CDMA systems with code-correlation constraint of one or two. In fact, this improvement in the throughput of PPM-CDMA systems over that of OOK-CDMA approaches a limiting factor of 10 as the pulse-position multiplicity increases to infinity.
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