Code length Reduction using CRFS Decoding for Frame Synchronization

The process of the mobile station searching for a cell and achieving code and time synchronization to its downlink scrambling code is referred to as cell search. Cell search is complete in two modes: Initial mode cell search when mobile is switched on, and Target cell search in which idle mode search when mobile is inactive and active mode search during a call or activities. The process of achieving code and time synchronization in cell search algorithm divided in to five stages which are slot synchronization, frame synchronization and scrambling code group identification, scrambling code identification, frequency acquisition, and cell identification. Initial cell search is need all five stages while in that last two stages do not need in target cell search. The slot synchronization is achieved by the primary synchronization code in cell search procedure to use in slot boundary detection. During 2nd stage secondary synchronization code is use to achieve frame synchronization and scrambling code group identification in cell search procedure. A pipelined process of the first three stages that minimizes the average code and time acquisition time, during initial cell search procedure much large which is reduced by maximum likehood based frequency acquisition method after first three stage completion