Patent ID: 7421045

Claim:
A method of correcting symbols of a common pilot channel (CPICH) to increase the accuracy of a signal-to-interference ratio (SIR) estimate, the method comprising: estimating a non-stationary mean of a group of the CPICH symbols by: partitioning the CPICH symbols into M groups of symbols, each group size being L(m), where m=1 . . . M; forming a vector Y from symbols in a current group of symbols; forming a vector X from −[L(m) −1]/2 up to [L(m) −1]/2 in steps of one; calculating the average of Y; calculating the vector inner-product of X and Y by the average of the square of the symbols in X, B=(X T Y)/average(X 2 ); calculating the best fit straight line, C m , through the symbols in the current group; continuing to partition the CPICH symbols, form the vectors X and Y, and calculate the average of Y, the vector-inner product and the best fit straight line until m=M; and concatenating the C m 's of the best fit straight line; delaying the CPICH symbols; and correcting the CPICH symbols by dividing the delayed CPICH symbols by the estimated non-stationary mean of the group of CPICH symbols.