Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Reexamination Certificate
2007-08-21
2007-08-21
Vu, Huy D. (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
C370S343000
Reexamination Certificate
active
10161133
ABSTRACT:
A signal to interference-plus-noise power ratio (SINR) measurement method for wireless communications systems which employ orthogonal frequency division multiplexing (OFDM) for multicarrier data transmission is disclosed. Fast-Fourier transform (FFT)-based SINR measurements can be computed on frame-by-frame or greater interval for individual or groupings of subchannel signals. Given a known transmitted time-domain OFDM frame preamble, and the corresponding channel and interference-plus-noise (IPN) corrupted received time-domain frame preamble, the disclosed method first computes the power spectral densities of the received signal of interest and of a received unwanted interference-plus-noise signal. The FFT-computed power spectral densities are then used to compute average received signal and received IPN power measurements for specified individual or groupings of OFDM subchannel signals. The power measurements are then frame-averaged using a recursive exponential smoothing method. The frame-averaged signal and IPN power measurements are then used to form quantized measurements of SINR for the specified OFDM subchannel signals of the received frame.
REFERENCES:
patent: 6128350 (2000-10-01), Shastri et al.
patent: 6456653 (2002-09-01), Sayeed
patent: 2002/0110138 (2002-08-01), Schramm
Denso Corporation
Morrison & Foerster / LLP
Ng Christine
Vu Huy D.
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