Patent ID: 7770086
Filing Date: 2010-08-03
Classification: H04B,H04L

Abstract:
1. A detection method for ACK/NACK signals, comprising the steps of a. calculating a decision variable by integration of a despread received signal; b. calculating four values, the first being proportional to a noise standard deviation after despreading the received signal, and the second depending on an estimated received signal for ACK, the third being proportional to a noise standard deviation after despreading the received signal, and the fourth depending on an estimated received signal for NACK; c. selecting the one with maximum absolute value from the first and second values as the threshold between ACK and DTX, and selecting the one with maximum absolute value from third and fourth values of the threshold between NACK and DTX; and d. comparing the decision variable with the two selected thresholds and making decision.