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The Journal of The Korea Institute of Intelligent Transport Systems Vol.3 No.1 pp.117-125
다중 심벌 디코딩을 이용한 차동 시공간 부호화된 OFDM
Differential space-time coded OFDM using multiple symbol decoding
Abstract
Space-time coding and modulation exploit the presence of multiple transmit antennas to improve performance on multipath Rayleigh fading channels. In this paper, we propose the Trellis-Coded Differential Space Time Modulation-OFDM system with multiple symbol detection. The Trellis-code perform the set partition with unitary group codes. The Viterbi decoder containing new branch metrics is introduced in order to improve the bit error rate (BER) in the differential detection of the Unitary differential space time modulation. Also, we describe the Viterbi algorithm in order to use this branch metrics. Our study shows that such a Viterbi decoder improves BER performance without sacrificing bandwidth and power efficiency.
