Signal constellations for multi-carrier systems

Details Signal constellations for multi-carrier systems Signal constellations for multi-carrier systems

2008-07-01

2008-07-01

Patel, Jay K. (Department: 2611)

Pulse or digital communications

Transmitters

C375S261000, C375S298000

Reexamination Certificate

active

07394865

ABSTRACT:
A signal constellation for wireline or wireless multi-carrier communication systems, such as systems using OFDM or MC-CDMA, has points separated from one another by maximizing a distance between conditional probability distributions, such as a Kullbeck-Leibler (KL) distance. Preferably, the constellation points are arranged in concentric circles, with or without a point at the origin, wherein adjacent circles are rotated to maximize an angular distance between points on adjacent circles. Pilot symbols inserted in the transmitted signal are used by a receiver to estimate the channel of the multi-carrier system. Different constellations show optimum performance for different signal to noise ratios, and for different numbers of taps used to estimate the channel, especially in a fast fading environment where there may be fewer pilots per OFDM or MC-CDMA symbol than channel taps.

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