Apparatus and method for detecting signal by maximum likelihood

Details Apparatus and method for detecting signal by maximum likelihood Apparatus and method for detecting signal by maximum likelihood

2011-08-09

2011-08-09

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Receivers

C375S340000, C375S262000

Reexamination Certificate

active

07995677

ABSTRACT:
An apparatus and method for detecting a signal in a receiver by maximum likelihood (ML) are provided, in which symbols are detected according to the number of transmit antennas of a transmitter and a modulation scheme, channels are estimated, an equivalent channel matrix corresponding to the estimated channels is determined, a permuted equivalent channel matrix is determined by multiplying the equivalent channel matrix by a predetermined permutation matrix, the permuted equivalent channel matrix is QR decomposed, a hard decision is performed on predetermined symbols among the detected symbols using a received signal resulting from the QR decomposition, and the log likelihood ratios (LLRs) of the hard-decided symbols are determined.

REFERENCES:
patent: 7292661 (2007-11-01), Chan et al.
patent: 2004/0001538 (2004-01-01), Garrett
patent: 2007/0127589 (2007-06-01), Hwang et al.
patent: 2008/0049862 (2008-02-01), Dean et al.
patent: 10-2007-0052037 (2007-05-01), None
patent: WO 2005/057838 (2005-06-01), None

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