Turbo decoder employing max and max* map decoding

Details Turbo decoder employing max and max* map decoding Turbo decoder employing max and max* map decoding

2007-04-24

2007-04-24

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C714S755000

Reexamination Certificate

active

10190972

ABSTRACT:
A turbo decoder employs max* term or max term maximum a priori (MAP) decoding of received, encoded data. Initially, MAP decoding is iterative and employs max* term computation of log-likelihood values at each iteration. Max* term computation includes computation of a max term and a logarithmic correction term. A bypass algorithm switches from max* term computation to only max term computation in later iterations with little or no degradation in decoder performance. The iteration selected for switching may be based on increasing intrinsic signal-to-noise ratio (SNR) of the iterative MAP decoding. Since, in general, fewer computations are required for max term computation than for max* term computation, switching between max* and max allows for reduced power consumption of a particular decoder implementation.

REFERENCES:
patent: 6392572 (2002-05-01), Shiu et al.
patent: 6393076 (2002-05-01), Dinc et al.
patent: 6510536 (2003-01-01), Crozier et al.
patent: 6725409 (2004-04-01), Wolf
patent: 6795512 (2004-09-01), Eidson et al.
patent: 6898254 (2005-05-01), Wolf et al.

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