Time domain source matched multicarrier quadrature amplitude mod

Details Time domain source matched multicarrier quadrature amplitude mod Time domain source matched multicarrier quadrature amplitude mod

1997-12-15

2000-05-09

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375261, 375298, 370345, 370436, 370442, 370458, 370464, 370498, 370478, 370536, 370543, 370544, 455 59, 455103, 455104, 455522, H04K 110, H04L 2728, H04L 2302, H04L 512

Patent

active

060614056

ABSTRACT:
A multicarrier transmission system (100) routes data symbols from a data source (142) to a multicarrier modulator (145). Each modulator (201, 202, 203) within the multicarrier modulator (145) is coupled to a corresponding gain adjuster (211, 212, 213) that distributes the available transmit power across various subcarriers. Power distribution, is determined in part, upon the noise sensitivity of the transmitted information. In accordance, data stream symbols of like sensitivity are grouped (520) and transmitted during defined time intervals. Each such group is assigned a unique transmission power level (530). At any given moment in time, all subcarrier transmission power levels will have an identical amplitude, thereby mitigating the impact of subchannel-to-subchannel interference.

REFERENCES:
patent: 4679277 (1987-07-01), Hughes-Hartogs
patent: 4731816 (1988-03-01), Hughes-Hartogs
patent: 4833706 (1989-05-01), Hughes-Hartogs
patent: 5054034 (1991-10-01), Hughes-Hartogs
patent: 5479447 (1995-12-01), Chow et al.
patent: 5822372 (1998-10-01), Emami
patent: 5832387 (1998-11-01), Bae et al.
patent: 5960003 (1999-09-01), Fischer et al.

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