System for soft symbol decoding with MIMO log-map detection

Details System for soft symbol decoding with MIMO log-map detection System for soft symbol decoding with MIMO log-map detection

2008-01-01

2008-01-01

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

C375S260000, C375S233000, C375S267000

Reexamination Certificate

active

07315576

ABSTRACT:
A soft symbol decoder for use in a multiple input multiple output (MIMO) and OFDM (orthogonal frequency division multiplexing) system. The decoder generates soft symbol values for a digital signal that represents a number of source bits. The source bits are transmitted as symbols in corresponding to points in a signaling constellation. Soft metrics are determined by searching for all possible multi-dimensional symbols that could have been transmitted. The method includes transmitting a sample of the multi-dimensional symbol using K transmit antennas. The multi-dimensional symbol is represent-able as a complex, K-dimensional vector x. Each vector component of vector x represents a signal transmitted with one of the K transmit antennas. After transmission through a communication channel, a sample corresponding to the transmitted sample is received. The received sample is represented by a complex, N-dimensional vector y, where N is the number of receive antennas in the MIMO system. After the sample is received, a soft metric L(bi) is determined for each bit biencoded by x according to the equation:L⁡(bi)=σ-2·(minxj⁢bi=-1⁢y-Hxj2-minxj⁢bi=+1⁢y-Hxj2),and xjrepresents all possible values for x. In addition, a reduced complexity method is used for providing soft metric values in the MIMO system. This exemplary aspect reduces the complexity of the above computations from 2BKto 2B(K−1), where B is the number of bits transmitted per symbol per antenna.

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