Decision feedback equalizer in an OFDM WLAN receiver

Details Decision feedback equalizer in an OFDM WLAN receiver Decision feedback equalizer in an OFDM WLAN receiver

2004-08-13

2008-03-04

Ahn, Sam K. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07340000

ABSTRACT:
In an OFDM radio receiver for a wireless packet network, an apparatus to equalize a presently received OFDM signal containing subcarriers using an equalizing signal formed from the past symbols of subcarriers. The apparatus includes a subtractor to subtract the equalizing signal from the present signal, a DFT device to convert to subcarriers, a forward processor to correct the subcarriers for the channel and phase errors, a decision device to make decisions for the subcarriers, a reverse processor to corrupt the decision-based subcarriers' phase in the same manner as the forward processor corrects the subcarrier's phase, an inverse DFT device to form a time signal from the reverse processed subcarriers, and a feedback filter to generate the equalizing signal. The feedback filter's impulse response is directly calculated from an estimate of the channel response.

REFERENCES:
patent: 2004/0091057 (2004-05-01), Yoshida
Kim et al. Residual ISI Cancellation for OFDM with Applications to HDTV Broadcasting, IEEE, 1998, p. 1590-1599.

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