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公开(公告)号：JP3532531B2
公开(公告)日：2004-05-31
申请号：JP2001127484
申请日：2001-04-25
Applicant: 松下電器産業株式会社
Abstract: PROBLEM TO BE SOLVED: To detect the time of initial synchronization accurately even if the scale of hardware is small and the level of an interference signal wave is higher than that of a desired wave. SOLUTION: Correlation output of a receiving signal and a synchronization word is detected at a specified time and a decision is made whether the detected correlation output is equal to or higher than a threshold. Data of the time corresponding to a correlation output not lower than the threshold is accumulated and a frequency distribution is obtained using the accumulated time data. Maximum frequency is then detected in the frequency distribution thus obtained and the time of initial synchronization is detected from the time of maximum frequency.
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公开(公告)号：JP3694479B2
公开(公告)日：2005-09-14
申请号：JP2001375083
申请日：2001-12-07
Applicant: 松下電器産業株式会社
IPC: H04J11/00 , H04B1/707 , H04B7/26 , H04J13/00 , H04L5/02 , H04W48/16 , H04W72/04 , H04W76/02 , H04Q7/38
CPC classification number: H04B1/70735 , H04B1/7083 , H04L5/0021 , H04L5/0048 , H04L27/2656
Abstract: A multicarrier radio communication technology that enables radio resources to be used effectively, interference to be suppressed, and a cell search to be performed at high speed, in a multicarrier CDMA system. In this technology, a secondary synchronization code (S-SCH signal) for identifying the group of scrambling codes divided into groups beforehand is frequency multiplexed in a plurality of subcarriers. A secondary synchronization code is coded in the time direction. Subcarriers in which a secondary synchronization code is multiplexed are mutually separated and equally spaced. The number of subcarriers in which a secondary synchronization code is multiplexed can be set to a small value with respect to the total number of subcarriers. A secondary synchronization code is an orthogonal code. On the receiving side, a cell search is carried out using such a frequency multiplexed type S-SCH.
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