Interference optimized OFDM

Details Interference optimized OFDM Interference optimized OFDM

2006-08-29

2010-10-12

Pan, Yuwen (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

C455S067110, C455S500000, C455S501000, C455S114200, C455S115100

Reexamination Certificate

active

07813701

ABSTRACT:
A wireless broadband communications system that provides increased reliability in environments in which portions of the available operating frequency band are subject to interference. The system determines whether the operating frequency band is being subjected to interference. If so, then the system determines whether such interference is affecting one or more portions of the band. If interference is affecting just portions of the band, then the system reduces the data rate and the number of sub-carriers used to transmit data. Next, the system allocates the data to be transmitted to the sub-carriers currently being subjected to the lowest levels of interference, while allocating no data to the sub-carriers currently being subjected to the highest levels of interference. In this way, the system allocates the data to be transmitted to the sub-carriers occupying optimal portions of the operating frequency band, in response to detected changes in the interference environment.

REFERENCES:
patent: 6934340 (2005-08-01), Dollard
patent: 2003/0193889 (2003-10-01), Jacobsen
patent: 1261140 (2002-11-01), None
patent: WO2006070551 (2006-07-01), None
L.Hanzo et al., OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting, 2003, p. 219-236.
Ramjee Prasad, OFDM for Wireless Communications Systems, 2004, p. 11-16.

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