Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2008-04-08
2008-04-08
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S140000, C340S539210, C370S320000, C370S335000, C455S067130, C455S134000, C455S226200, C455S226300
Reexamination Certificate
active
07356071
ABSTRACT:
The present invention is related to a method and apparatus for estimating signal-to-noise ratio (SNR) based on dedicated physical channel (DPCH) pilot symbols in a wireless communication system. A receiver receives a DPCH transmission and a despreader despreads the received DPCH transmission. A selector selects pilot symbols in the despread DPCH transmission. A signal power estimator estimates signal power based on the pilot symbols, and a noise power estimator estimates noise power based on the received DPCH transmission. A SNR estimator estimates an SNR based on the signal power estimation and the noise power estimation. The noise power estimator may calculate the noise power estimation either based only on pilot symbols or based on both pilot symbols and non-pilot symbols. The DPCH transmission may be transmitted using more than one antenna for transmit diversity.
REFERENCES:
patent: 2003/0125040 (2003-07-01), Walton et al.
patent: 2004/0264604 (2004-12-01), Malette et al.
3GPP TS 25.211 “Third Generation Partnership Project; Technical Specification Group Radio Access Network; Physical Channels and Mapping of Transport Channels onto Physical Channels (FDD)”, Release 5; V5.4.0, Jun. 2003.
3GPP TS 25.214 “Third Generation Partnership Project; Technical Specification Group Radio Access Network; Physical Layer Procedures (FDD)”, Release 5; V5.5.0, Jun. 2003.
Li Bin
Sternberg Gregory S.
Yang Rui
Dsouza Adolf
InterDigital Technology Corporation
Payne David C.
Volpe & Koenig P.C.
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