Complex valued bolcik codes for ofdm-cdmal application

摘要

This paper introduces the extension of Walsh-Hadamard block codes in order to obtain complex calued block lcodes. These complex valued block codes lead to an improved spectral efficiency with additional lower error rate. Applied for low rate concatenated coding schemes required for CDMA uplink transmission, the gain in spectral efficiency due to the new codes can be used for strengthening other codes participating. We observe a gain o f about 1.7 dB for BER chemical bounds 10~*-3) for OFDM-CDMA transmission.