Iterative detection and decoding for a MIMO-OFDM system

Details Iterative detection and decoding for a MIMO-OFDM system Iterative detection and decoding for a MIMO-OFDM system

2008-05-13

2008-05-13

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S149000, C375S150000

Reexamination Certificate

active

11557662

ABSTRACT:
Techniques to iteratively detect and decode data transmitted in a wireless (e.g., MIMO-OFDM) communication system. The iterative detection and decoding is performed by iteratively passing soft (multi-bit) “a priori” information between a detector and a decoder. The detector receives modulation symbols, performs a detection function that is complementary to the symbol mapping performed at the transmitter, and provides soft-decision symbols for transmitted coded bits. “Extrinsic information” in the soft-decision symbols is then decoded by the decoder 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.

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Anh V. Nguyen et al, “Iterative Demodulation and Decoding of Differential Space-Time Block Codes”, IEEE, VTS-2000, 52nd, vol. 5, pp. 2394-2400, Sep. 2000.

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