Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-12-26
2006-12-26
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S149000, C375S150000, C714S784000
Reexamination Certificate
active
07154936
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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Bjerke Bjorn A.
Ketchum John W.
Walton Jay R.
Ghayour Mohammed
Ghulamali Qutub
Milikovsky Dmitry R.
Minhas Sandip (Micky) S.
Qualcomm Incorporated
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