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

10607406

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.

REFERENCES:
patent: 4891823 (1990-01-01), Cole
patent: 5267021 (1993-11-01), Ramchandran et al.
patent: 5537430 (1996-07-01), Park et al.
patent: 5822371 (1998-10-01), Goldstein et al.
patent: 5828695 (1998-10-01), Webb
patent: 6081555 (2000-06-01), Olafsson
patent: 6097764 (2000-08-01), McCallister et al.
patent: 6226334 (2001-05-01), Olafsson
patent: 6654431 (2003-11-01), Barton et al.
patent: 7016296 (2006-03-01), Hartman, Jr.
patent: 2001/0031019 (2001-10-01), Jafarkhani et al.
patent: 2002/0131515 (2002-09-01), Rodriguez
patent: 2003/0043887 (2003-03-01), Hudson
patent: 2003/0076889 (2003-04-01), Walker et al.
patent: 2003/0123877 (2003-07-01), Lo
patent: 2003/0126536 (2003-07-01), Gollamudi et al.
patent: 2003/0210824 (2003-11-01), Falzon et al.
patent: 2005/0094740 (2005-05-01), Borran et al.
patent: 1324558 (2003-07-01), None
Cover, et al., “Elements of Information Theory”, Wiley Interscience, 1991, p. 231.

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