초록 ▼

The present invention realizes a rapid and efficient cell search and small-size instrument for an asynchronous DS-CDMA cellular system. This cell search detects the correlation between the received signal and the short code of the control channel, and matched filter 22 detects the maximum electric p

The present invention realizes a rapid and efficient cell search and small-size instrument for an asynchronous DS-CDMA cellular system. This cell search detects the correlation between the received signal and the short code of the control channel, and matched filter 22 detects the maximum electric power correlation peak location. Next, using correlators 28-1 to 28-n which are parallelly set in a plurality for RAKE processing with plurality, identifies the long code that is set in the system with the detected long code timing. After the long code is synchronized, a multipath signal is received using 28-1 to 28-n, and the data is judged by RAKE processing. When peripheral cell search is executed, after long code timing is detected by using matched filter 22, the long code of the candidate peripheral cell is designated using the same matched filter. Handover is safely realized by receiving the signal from the connected base station by correlators 28-1 to 28-n, and the base station signal through handover by 22.

대표청구항 ▼

[ What is claimed is:] [2.] A receiver for an asynchronous DS-CDMA cellular communication system using spread code sequences having a long code peculiar to each cell and a short code corresponding to each communication channel, and employing a specified short code common to each cell in the receiver

[ What is claimed is:] [2.] A receiver for an asynchronous DS-CDMA cellular communication system using spread code sequences having a long code peculiar to each cell and a short code corresponding to each communication channel, and employing a specified short code common to each cell in the receiver's control channel, comprising:i) a matched filter for detecting a correlation between a received signal and a spread code sequence;ii) a plurality of correlators parallelly set for detecting a correlation between said received signal and spread code sequence;iii) a long code timing detector for detecting the maximal correlated output of said matched filter;iv) a long code synchronization judging means for receiving said correlated output from said matched filter;v) a long code synchronization judging means for receiving said correlated output from said plurality of correlators;vi) a correlator controller for receiving an output of said long code timing detector and for controlling the action of said plurality of correlators; andvii) a spread code controller for receiving an output from said long code synchronization judging means, and for outputting control signals to select a spread code sequence used for correlating action in said matched filter and said plurality of correlators.