Method and system for I/Q branch equalization in OFDM systems

Details Method and system for I/Q branch equalization in OFDM systems Method and system for I/Q branch equalization in OFDM systems

2011-01-04

2011-01-04

Pham, Chi H (Department: 2471)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S067160, C455S284000, C455S295000

Reexamination Certificate

active

07865202

ABSTRACT:
Aspects of a method and system for I/Q branch equalization in OFDM systems may include determining a transfer function mismatch between an in-phase processing branch, and/or a quadrature processing branch in an OFDM receiver. The determined transfer function mismatch may be compensated for, by applying equalization after a fast Fourier transform (FFT) in an in-phase processing branch and/or a quadrature processing branch. The OFDM system may be compliant with, for example, UMTS LTE (EUTRA), WiMAX (IEEE 802.16), DVB-H, and WLAN (IEEE 802.11). A transfer function may be measured for an in-phase branch filter and/or quadrature branch filter to determine the transfer function mismatch. The transfer function mismatch may be compensated for, in frequency domain by the equalizer. The transfer function mismatch may comprise magnitude and/or phase response mismatch, wherein the magnitude and/or phase response mismatch may be a function of frequency.

REFERENCES:
patent: 6535715 (2003-03-01), Dapper et al.
patent: 6628735 (2003-09-01), Belotserkovsky et al.
patent: 7570923 (2009-08-01), Kiss et al.

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