Initial Synchronization Method and Receiver in Asynchronous Cellular System between Direct-spread Code Division Multiple Access Base Stations

摘要

The cell search in the asynchronous cellular system between DS-CDMA base stations is made faster, and high efficiency and small size are realized.;In the cell search, the matched filter 22 is used to detect the relationship with the short code of the control channel, and the correlation peak position of the maximum power is detected as the long code timing. Subsequently, correlators 28-1 to 28-n provided in parallel in parallel for RAKE synthesis are used in parallel, and the long code scheduled in the system is specified at the detected long code timing. After the long code synchronization is established, the multipath signals are received using the correlators 28-1 to 28-n described above, and RAKE is synthesized to determine the data. When searching for neighbor cells, the long code timing is detected using the matched filter 22, and then the long codes of the candidate neighbor cells are equally determined using the matched filter 22. FIG. The signals from the base stations being connected are received by the correlators 28-1 through 28-n, and the signals from the base stations on both sides are received by the matched filter 22 to securely perform the transition.