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Low Density Parity Check (LDPC) Coded OFDM System Using Unitary Matrix Modulation (UMM)  

Kim Nam Soo (모빌링크 텔레콤(주))
Kang Hwan Min (삼성전자 정보통신총괄 통신연구소)
Cho Sung Ho (한양대학교 정보통신대학)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.5A, 2005 , pp. 436-444 More about this Journal
Abstract
Unitary matrix modulation (UMM) is investigated in multiple antennas system that is called unitary space-time modulation (USTM). In an OFDM, the diagonal components of UMM with splitting over the coherence bandwidth (UMM-S/OFDM) have been proposed. Recently LDPC code is strongly attended and studied due to simple decoding property with good error correction property. In this paper, we propose LDPC coded UMM-S/OFDM for increasing the system performance. Our proposed system can obtain frequency diversity using UMM-S/OFDM like USTM/OFDM, and large coding gain using LDPC code. The superior characteristics of the proposed UMM-S/OFDM are demonstrated by extensive computer simulations in multi-path Rayleigh fading channel.
Keywords
직접수열 부호분할 다중접속;서명수열;상관 함수;4-위상 신호 방식;의사잡음 수열;
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