Proposal of Combined Multi-Level Modulation Methods on Wireless Access Networks and Its Application Effects

概要

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In wireless across system, we need to use a limited frequency and electric power efficiently. And so we propose the fixed wireless access network using 5GHz frequency which hand has a good propagation performance in line of sight(LOS). In the proposed network, the several multi-level modulation methods arc combined and identical frequency is reused by considering on the antenna directivity. As constructing this network, we can efficiently use frequency in 5GHz hand and enlarge system capacity. In this paper, it is assumed that user terminals are distributed nonuniformly over the service area. We analyze accommodation number of user terminals and the optimum combination of modulation methods. Numerical results show that most effective method is the combination of 16QAM and 256QAM, which can accommodate up to about 1.4 times as many users as only QPSK modulation method.
社団法人電子情報通信学会の論文
2003-02-01