ITERATIVE DETECTION AND DECODING FOR MIMO-OFDM SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide techniques for iterative detection and decoding for a MIMO (Multi Input Multi Output)-OFDM (Orthogonal Frequency Division Multiplexing) system.;SOLUTION: The iterative detection and decoding is performed by iteratively passing soft (multi-bit) "a priori" information between a detector and a decoder. The detector performs a detection function that is complementary to the symbol mapping and provides soft-decision symbols. "Extrinsic information" in the soft-decision symbols is then decoded to provide its extrinsic information, which comprises the a priori information used by the detector in the detection process. The detection and decoding may be iterated a number of times. The soft-decision symbols and the a priori information may be represented using log-likelihood ratios (LLRs). Techniques are provided to reduce the computational complexity associated with deriving the LLRs, including interference nulling to isolate each transmitted signal and "dual-maxima" approximation.;COPYRIGHT: (C)2010,JPO&INPIT