Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2005-03-24
2008-11-11
Pham, Tuan A (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S302000, C455S303000, C455S304000, C375S348000, C375S232000, C375S350000
Reexamination Certificate
active
07450924
ABSTRACT:
A combined SAIC receiver and a multiple-antenna, receive diversity receiver are employed to reduce interference in a wireless system. The real and imaginary parts of the de-rotated signal for each receive path associated with an antenna are separately filtered and a combined output signal of all receive paths is generated. The weighting coefficients are adjusted based on an error signal produced by comparing the combined output signal with a reference signal. The weighting coefficients are initially set based on an MMSE/LS type of signal processing criteria, where the reference signal is the Training Sequence Code (TSC). Subsequent adjustment/tracking can be accomplished by using known tracking algorithms, e.g. LMS or RLS, or the coefficients can be re-computed using MMSE/LS processing. The reference signal for tracking may be a combination of the TSC and estimated data symbols provided by an equalizer.
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Ghosh Arunhaba
Kobylinski Richard A.
Mostafa Ayman
AT&T Mobility II LLC
Pham Tuan A
SBC Knowledge Ventures L.P.
Zagorin O'Brien Graham LLP
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