Upstream Channel Structure for Bidirectional LMDS using CDMA


The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 6, No. 2, pp. 408-414, Feb. 1999
10.3745/KIPSTE.1999.6.2.408,   PDF Download:

Abstract

In this paper, we propose the method using coherent detection with time division multiple pilot signal for each users in reverse CDMA channel as the structure of reverse CDMA channel to apply CDMA to upstream channel of bidirectional LMDS. By using coherent detection with pilot signal in reverse CDMA channel, capacity can be improved when compared with noncoherent detection, but it is required to allocate pilot signal for all user. And then interference is increased due to allocate continuously the pilot signals. In this case channel capacity is decreased. The method of pilot allocation is needed that reduce this interference and keep synchronization effect using coherent detection. In the reverse link, the pilot allocated to each users at different time and not overlapped is possible solution for it. This pilot is proposed and analyzed its performance and capacity. The result is that proposed method has more increased capacity compared with others.


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Cite this article
[IEEE Style]
L. H. Rae and C. B. Lok, "Upstream Channel Structure for Bidirectional LMDS using CDMA," The Transactions of the Korea Information Processing Society (1994 ~ 2000), vol. 6, no. 2, pp. 408-414, 1999. DOI: 10.3745/KIPSTE.1999.6.2.408.

[ACM Style]
Lim Hyung Rae and Cho Byung Lok. 1999. Upstream Channel Structure for Bidirectional LMDS using CDMA. The Transactions of the Korea Information Processing Society (1994 ~ 2000), 6, 2, (1999), 408-414. DOI: 10.3745/KIPSTE.1999.6.2.408.