Turbo decoding system using nth root metrics for...

Details Turbo decoding system using nth root metrics for... Turbo decoding system using nth root metrics for...

2008-10-22

2011-11-01

Lugo, David (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S329000, C375S324000, C375S341000

Reissue Patent

active

RE042884

ABSTRACT:
An nth root transformation is used for generating near Gaussian metrics from non-Gaussian metrics for input into a conventional turbo decoder that is based on the assumption that the input sequence to the decoder has a Gaussian distribution. The nth root transformation transforms channel non-Gaussian statistics to near Gaussian statistics for use with conventional turbo decoding for improved noncoherent communications over a non-Gaussian channel, such as a fading channel. For a differential coherent PSK waveform, where the channel statistics of a demodulator are non-Gaussian, for example, in the presence of fading, the nth root transformation is used to transform the non-Gaussian statistics to near Gaussian statistics for generating near Gaussian metrics, for improved PSK communications.

REFERENCES:
patent: 5640429 (1997-06-01), Michels et al.
patent: 6473449 (2002-10-01), Cafarella et al.
patent: 6904555 (2005-06-01), Nagase et al.

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