Performance Evaluation on Power Control and Diversity of Next-Generation CDNA System(Special Issue on Third Generation Land Mobile Communication Systems)

概要

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In this paper, we briefly describe the proposed radio access scheme based on CDMA/FDD for next-generation mobile radio systems, and evaluate itsperformance through laboratory and field experiments on transmission power control(TPC)and diversity, which are the key technologies to achieve efficient CDMA systems. The design of the practical TPC method is discussed, and a robust method is presented for operation in low signal to interference powerratio(SIR). Laboratory experiments demonstrate that space and path diversity effectively improve the TPC performance in the Doppler frequency range of 40 to 80 Hz, and reduces the required E_b/N_o to achieve the BER of 10^-3. The necessary diversity order for multipath fading mitigation in all the Doppler frequency range is also investigated. Through the field experiments in urban area of Tokyo using a developed system at 0.96Mcps, a low required E_b/N_o of 2.8dB can be obtained because ofthe effectiveness of the diversity.
社団法人電子情報通信学会の論文
1998-07-25