Browsing by Author "Lin, KJ"

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Adaptive selection combining for soft handover in OVSFW-CDMA systems
(2004-11-01)
Lin, KJ
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Tseng, YC
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資訊工程學系
;
Department of Computer Science
In W-CDMA, soft handover is supported at cell boundaries to maintain communication quality. The maximal ratio combining (MRC) and generalized selection combining (GSC) [1], [2] are two possible approaches. However, soft handover is resource-intensive. In this letter, we propose an adaptive selection combining (ASC) scheme that can switch flexibly between MRC and GSC so as to take care of both channel loading and communication quality. The signal-to-interference-and-noise ratio (SINR) is kept as high as that of MRC while the blocking probability can remain at about the same level as that of GSC.
Channel-sharing strategies in two-tier cellular PCS systems
(2002-09-01)
Lin, KJ
;
Tseng, YC
;
Sheu, JP
;
資訊工程學系
;
Department of Computer Science
A two-tier cellular network is characterized by macrocells and microcells overlapping in the service area. This overlapping property provides an advantage that traffic loads can be shared by channels of the two tiers to increase the performance of the system. In this paper, we propose two channel-sharing strategies, namely vertical channel-sharing and vertical-horizontal channel-sharing, to better utilize channels of the network. The call loss probability of new calls and call dropping probability of handoff calls are developed through analyses and simulations. The results justify the advantage of our strategies over existing strategies. (C) 2002 Elsevier Science B.V. All rights reserved.