System and method for improving the performance of OFDM systems

Details System and method for improving the performance of OFDM systems System and method for improving the performance of OFDM systems

2005-12-12

2009-12-29

Tran, Khai (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07639749

ABSTRACT:
A method for improving the performance of OFDM (Orthogonal Frequency Division Multiplexing) systems addresses the channel estimation, equalization and decoding problems of conventional techniques and provides improved performance in a wide range of operating conditions that include varying Signal to Noise Ratio (SNR) levels, data rates, and fading channels. The method teaches SNR based selection in the use/choice of a smoothing filter. The invention further teaches using a smoothing filter in combination with Decision Feedback Equalization (DFE), using a smoothing filter in combination with WCSI (Weighted Channel State Information) decoding, which may be combined with DFE, and data rate based selection (for example, in IEEE 802.11a/g applications) in employing a decision feedback based correction.

REFERENCES:
patent: 7039004 (2006-05-01), Sun et al.
patent: 7388910 (2008-06-01), McKown
patent: 2005/0084023 (2005-04-01), Bott et al.

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