Multipath Searcher Results Sorting Method

[0012]Normally the multipath searcher will store the profile of the located energy peaks in memory. When the multipath searcher profile procedure is finished, the multipath sorting procedure will be executed to provide multipath searcher results. Due to the harsh wireless environment, the profile values may be very noisy. In our algorithm, this noise will be considered and used to improve the multipath searcher performance.

[0013]First, the lowest value in the searching window (all correlation values are positive, due to the non-coherent correlation) is found and removed from each entry in the search buffer. This process is called DC value removal. V is the buffer of correlation values output from the searcher, Vi is an individual entry in the buffer, where i ranges from 0 to M−1.

Vi=Vi−MIN(V) i=0 . . . M−1

[0014]Second, the noise floor is calculated for the entire multipath searching window. Assuming that the total searching window has M points, where M is the number of samples per chip