Patent ID: 6813262
Filing Date: 2004-11-02
Classification: H04B

Abstract:
A synchronization tracking method in a code division multiple access (CDMA) receiver having a pseudo noise code generator, a received signal shift register unit, a pseudo noise code shift register unit and a demodulator, said method comprising the steps of:oversampling received signals corresponding to a plurality of chips at a predetermined speed and sequentially storing the oversampled signals in said received signal shift register unit; sequentially storing pseudo noise codes generated in said pseudo noise code generator in said pseudo noise code shift register unit in a chip unit; correspondingly multiplying the output data from said received signal shift register unit and the pseudo noise codes outputted from said pseudo noise code shift register unit by means of a plurality of multipliers; adding the data outputted from said plurality of multipliers and storing the added result as the phase information and energy value for one path; while moving the pseudo noise codes by a predetermined chip section to adjust the phase of the moved pseudo noise codes, repeatedly performing the above procedures as many as the number of pseudo noise code shift registers in said pseudo noise code shift register unit, thereby storing the phase information and energy values for all paths; and selecting the path corresponding to a largest value in the stored phase information and energy values for all paths and informing said demodulator of the selected path.