Coded modulation for partially coherent systems

Details Coded modulation for partially coherent systems Coded modulation for partially coherent systems

2006-08-08

2006-08-08

Ha, Dao (Department: 2634)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S262000, C375S346000, C714S786000, C714S798000

Reexamination Certificate

active

07088784

ABSTRACT:
A signal constellation is optimized for trellis coded modulation in fast fading channels, where the receiver does not have perfect knowledge of the channel parameters. Specifically, the signal constellation is partitioned into 2nmutually exclusive subsets, each preferably defining two points. Points within each subset are separated from one another by a distance between conditional distributions, preferably a Kullback-Leibler (KL) distance. For a block m=k1+k2of information bits input into a trellis coder30, the k1bits are trellis encoded into n bits (n>k1) and used to select a subset of the constellation. The k2bit(s) is/are used to select a particular point within the subset. Because the inter-subset distance between points is a KL distance that is effectively greater than a Euclidean distance, error at the receiver is substantially reduced, especially at higher SNR. Using a KL distance ensures statistics of channel fading are inherent within the signal constellation.

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