| 摘要 |
A method and system are disclosed for determining the position of mobile stations (120) in a CDMA cellular system, in which each symbol (S1) to be transmitted by a mobile station (120) is first spread by a short code, and the resulting signal is further spread by a long code. The spreading code (C1) is divided into N-chip sections. Consequently, even if the transmitted symbols are unknown, the N-chip sections of the resulting signal are known (at least to within an unknown phase difference). The mobile station (120) then transmits the resulting spread signal. At the receiving base station, the received spread signal is correlated (and despread) with the known codes, and the original data is reconstructed. As such, the timing of the received signal can be determined with an accuracy of at least the time interval of the unknown phase difference. |
