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1. (WO2001028122) SHORT CODE DETECTION METHOD

Pub. No.:    WO/2001/028122    International Application No.:    PCT/US2000/025772
Publication Date: Apr 19, 2001 International Filing Date: Sep 21, 2000
IPC: H04B 1/707
H04B 7/26
Applicants: INTERDIGITAL TECHNOLOGY CORPORATION
Inventors: OZLUTURK, Fatih, M.
JACQUES, Alexander, M.
Title: SHORT CODE DETECTION METHOD
Abstract:
A method is disclosed for receiving a transmitted signal in a communication system employing CDMA techniques wherein the transmitted signal includes a plurality of short codes, each of which is transmitted repetitively over a fixed period of time and where the received signal has CW interference in addition to the transmitted signal. The method includes using a Sequential Ratio Probability Test (SPRT) for detecting the presence of the short code in a plurality of time phases of the received signal by calculating a likelihood ratio for each phase. A likelihood ratio is a comparison of the signal's Probability Distribution Function (PDF) with a background noise PDF. The background noise PDF is calculated by combining in the RAKE the current short code with the input signal.