Abstract
This paper aims at the realization of a large-capacity mobile communication system in the microcellular environment and proposes adaptive modulation with dynamic channel assignment (AMDCA) where the idea of dynamic channel assignment (DCA) is introduced into the slow adaptive modulation system. In the proposed system, the received average signal power-to-noise/interference power ratio [C/(N + I)] is measured for each TDMA (time division multiple access) slot. The choice of idle slots in DCA and the choice of applicable modulation parameters for the slots are made in parallel. Thus, wireless frequency resource assignment and the setting of the modulation parameters take place at the same time. This reduces the effect of the space–time distribution of the traffic in DCA and also reduces the effect of the spatial distribution of the received power in the slow adaptive modulation system on the geographical difference of the blocking probability of the users. The performance of the proposed method is evaluated by a computer simulation, and it is verified that a capacity approximately 3 times larger can be realized compared with conventional fixed-channel assignment in fixed QPSK in the case of voice transmission. © 1998 Scripta Technica, Electron Comm Jpn Pt 1, 82(1): 55–64, 1999
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