Soft bits normalization apparatus, method, and system

Details Soft bits normalization apparatus, method, and system Soft bits normalization apparatus, method, and system

2003-09-25

2008-03-25

Odom, Curtis B. (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S229000, C375S262000, C375S341000

Reexamination Certificate

active

07349495

ABSTRACT:
A receiver estimates a channel parameter from a received signal. The channel parameter may a DC signal level, a carrier to interference ratio, a noise spectrum, or the like. The receiver performs channel equalization and produces estimated symbols. The estimated symbols are remodulated and the channel parameter is re-estimated. An initial estimation error is calculated as the difference between the two estimates. The estimated symbols are weighted using the initial estimation error, and channel decoding is performed. Estimated symbol weights may be reduced when the initial estimation error is above a threshold, and may be increased when the initial estimation error is below a threshold.

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Visoz, R , et al., “Turbo Equalization and Incremental Redundancy for Advanced TDMA Systems”,IEEE, (2001), pp. 1629-1633.

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