High-speed cell search system for CDMA

摘要

In a high-speed search system for CDMA, plural (M) symbols, which are subjected to spread frequency coding with a spreading code called as a short code, are prepared when synchronization of the spreading code is established before carrier synchronization is established in a mobile station used in a CDMA cellular system. Data which are obtained by forming an orthogonal code with the polarities of the M symbols are set as a down signal. When the orthogonal code concerned is detected, coherent integration is performed by a correlator 21 having combinations of the polarities which can be possibly taken by the code over the plural symbols (of M) constituting the code. Long-code identification 25 follows.