一种基于CDMA的非对称LMDS上游信道结构

B. Cho, H. Lim, Jae-chul Song, Dae-Jin Kim
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引用次数: 0

摘要

本文提出了一种将CDMA应用于双向LMDS上行信道的方法,该方法采用反向CDMA信道中每个用户一个时分多导信号的相干检测作为反向CDMA信道的结构。在反向CDMA信道中使用带导频信号的相干检测,与非相干检测相比,容量有所提高,但需要为所有用户分配一个导频信号。此外,由于需要连续分配导频信号,干扰也增加了。在这种情况下,信道容量减少。需要一种导频分配方法来减少这种干扰,并利用相干检测保持同步效果。在反向链路中,试点在不同的时间分配给每个用户并且不重叠是可能的解决方案。提出了该试点方案,并对其性能和容量进行了分析。结果表明,与其他方法相比,所提出的方法具有更大的容量提升。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new upstream channel structure for asymmetric LMDS with CDMA
We propose a method using coherent detection with a time division multiple pilot signal for each user in the reverse CDMA channel as the structure of reverse CDMA channel to apply CDMA to the upstream channel of bidirectional LMDS. By using coherent detection with a pilot signal in the reverse CDMA channel, the capacity can be improved when compared with noncoherent detection, but it is required to allocate a pilot signal for all users. Also, the interference is increased due to the need to continuously allocate the pilot signals. In this case the channel capacity is decreased. A method of pilot allocation is needed that reduce this interference and keep the synchronization effect using coherent detection. In the reverse link, where the pilot is allocated to each user at a different time and not overlapped is possible solution. This pilot is proposed, and its performance and capacity analyzed. The result is that the proposed method has a greater increased capacity compared with others.
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