Space-Code Transmit Diversity for OFDM-CDM Systems(<Special Issue>Software Defined Radio Technology and Its Applications)

概要

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This paper presents a transmit diversity scheme that uses space-time block codes (STBC) in space-spreading code dimensions for time-direction spreading or two-dimensional spreading orthogonal frequency-division multiplexing code-division multiplexing (OFDM-CDM) downlink transmission The STBC output symbols in two adjacent time slots are spread by two distinctive spreading codes and multiplexed in the same spreading segment At a receiver, the received subcarriei signals are despread with the two spreading codes in the direction of time, space-time decoded, and then combined in the direction of frequency Simulation results demonstrated that the proposed scheme provided high tolerance to Doppler spread and outperformed space-time transmit diversity (STTD) for high-mobility users
一般社団法人電子情報通信学会の論文
2003-12-01