下りリンク可変拡散率OFCDMブロードバンドパケット無線アクセスにおける2次元拡散の効果(<特集>通信と制御)

概要

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This paper investigated the effect of two-dimensional spreading with the spreading factors in the time and frequency domains, SF_<Time>, SF_<Freq>, for Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) broadband packet wireless access by the implemented base and mobile stations equipments. Experimental results elucidated that the when QPSK data modulation was used, the required average received E_s/N_o could be reduced most at the SF_<Time>×SF_<Freq>=4×4 for the case of 15 code multiplexing, and meanwhile, by increasing SF_<Freq> to 16, it was reduced by approximately 2dB compared to that with SF_<Time>×SF_<Freq>=16×1 assuming total spreading factor is 16. Moreover, it was also clarified that when 16 QAM modulation was used, although the required average received E_s/N_o was reduced by increasing SF_<Freq> value to 16 for 4 code multiplexing, use of only time-domain spreading SF_<Time>×SF_<Freq>=16×1 was superior most for 15 code multiplexing case.
日本シミュレーション学会の論文
2005-06-15