Cell search method for a downlink channel of an OFDMA transmission system

摘要

A cell search method in a multiple carrier wireless network includes a step of trying to select, among a list of candidate couples [carrier frequency; bandwidth], at least one candidate associated with at least one cell of the multiple carrier wireless network. The cell search method includes: a step of obtaining and ordering an initial list of possible candidate couples [carrier frequency; bandwidth] according to the multiple carrier wireless network; a step of reducing the initial list, delivering a reduced list, the reduced list including only candidates compatible with a predetermined communication mode of the multiple carrier wireless network, through a differential cross correlation of the candidate couples [carrier frequency; bandwidth] of the initial list; a cell search step in which a cross-correlation is performed by testing all time/frequency hypothesis for at least one candidate of the reduced list of candidates, delivering synchronisation information.

主权项

1. A cell search method in a multiple carrier wireless network, said method comprising:
a step of obtaining and/or ordering an initial list of possible candidate couples, [carrier frequency; bandwidth], by an apparatus according to said multiple carrier wireless network; a step of reducing said initial list by the apparatus, delivering a reduced list of candidate couples, said reduced list comprising only the candidate couples of the initial list that are compatible with a predetermined communication mode of said multiple carrier wireless network, wherein said step of reducing said initial list comprises for at least some candidate couples of said initial list, an OFDMA processing step, in which a preamble is searched in view of a given number of symbols applied to a received signal at values of a current candidate couple, said search being made by calculating a differential cross correlation C, between a differential received vector, calculated from said received signal, and a differential preamble vector; and a step of searching, among the reduced list of candidate couples [carrier frequency; bandwidth], for at least one candidate couple associated with at least one cell of said multiple carrier wireless network and, if identified, selecting the at least one candidate couple associated with the at least one cell of said multiple carrier wireless network.