Telecommunications – Transmitter
Reexamination Certificate
2005-04-13
2008-12-09
Nguyen, Simon D (Department: 2618)
Telecommunications
Transmitter
C455S114300, C375S296000
Reexamination Certificate
active
07463866
ABSTRACT:
A system and method are provided for compensating for an I/Q mismatch of either a direct conversion transmitter or a direct conversion receiver based on known short training symbols of a Short Training Sequence (STS) of packets transmitted according to the IEEE 802.11a or 802.11g standard. To compensate for an I/Q mismatch of a direct conversion transmitter, a packet including the STS is transmitted. Due to the I/Q mismatch of the direct conversion transmitter, the transmitter distorts the packet to provide a distorted packet including a distorted STS. Based on one or more short training symbols of the distorted STS and a known ideal short training symbol, a distortion matrix is determined. Subsequent packets transmitted by the direct conversion transmitter are pre-distorted based on the distortion matrix. Compensation of the I/Q mismatch of a direct conversion receiver may be performed in a similar fashion.
REFERENCES:
patent: 6252912 (2001-06-01), Salinger
patent: 6337888 (2002-01-01), Huang et al.
patent: 6628926 (2003-09-01), van de Beek et al.
patent: 6977977 (2005-12-01), Dubrovin et al.
patent: 7103332 (2006-09-01), Choi et al.
patent: 7123670 (2006-10-01), Gilbert et al.
patent: 7146146 (2006-12-01), Masenten et al.
patent: 7158586 (2007-01-01), Husted
patent: 7203247 (2007-04-01), Bauder et al.
patent: 7215716 (2007-05-01), Smith
patent: 7248625 (2007-07-01), Chien
patent: 7274750 (2007-09-01), Mueller
patent: 7324609 (2008-01-01), Hwang et al.
patent: 2002/0177425 (2002-11-01), Li
patent: 2003/0184374 (2003-10-01), Huang et al.
patent: 2004/0137869 (2004-07-01), Kim
patent: 2004/0142667 (2004-07-01), Lochhead et al.
patent: 2004/0203472 (2004-10-01), Chien
patent: 2005/0041754 (2005-02-01), Wu et al.
patent: 2005/0075815 (2005-04-01), Webster et al.
patent: 2005/0118963 (2005-06-01), Chiu
patent: 2005/0148304 (2005-07-01), Jerng
patent: 2005/0163251 (2005-07-01), McCallister
patent: 2005/0276354 (2005-12-01), Su et al.
patent: 2006/0209993 (2006-09-01), Lu
patent: 2008/0118004 (2008-05-01), Forenza et al.
Nguyen Simon D
RF Micro Devices, Inc.
Withrow & Terranova, P.L.L.C.
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