Patent ID: 8121095

Claim:
A system for adjusting a time offset of global position system (GPS) signals in a code division multiple access (CDMA) mobile phone, the system comprising a CDMA communication tester, a GSM simulator, a combiner, the CDMA mobile phone, and a computer connected in turn, the CDMA communication tester is further connected to the combiner, the CDMA communication tester comprising: a periodic wave transmitting module configured for generating periodic waves and transmitting the periodic waves to the GPS simulator; a CDMA radio frequency (RF) signal transmitting module configured for generating CDMA RF signals and transmitting the CDMA RF signals to the combiner; a CDMA delay timer module configured for clocking a first delay time between a time the CDMA communication tester begin transmitting the periodic waves and a time the CDMA communication tester begin transmitting the CDMA RF signals; the GPS simulator comprising: a periodic wave receiving module configured for receiving the periodic waves from the periodic wave transmitting module; a GPS RF signal transmitting module configured for generating GPS RF signals and transmitting the GPS RF signals to the combiner; a GPS delay timer module configured for clocking a second delay time between a time the GPS simulator begin receiving the periodic waves and a time the GPS simulator begin transmitting the GPS RF signals; the combiner being configured for generating combined signals by combining the CDMA RF signals and the GPS RF signals, and transmitting the combined signals to the CDMA mobile phone; the CDMA mobile phone comprising: a demodulating module configured for demodulating the combined signals, and clocking a third delay time between a time the combiner begin receiving the CDMA RF signals and a time the combiner begin receiving the GPS RF signals; and the computer comprising a calculating module configured for calculating a time offset between CDMA signals and GPS signals in the CDMA mobile phone according to the first delay time, the second delay time, and the third delay time, and synchronizing the CDMA signals and the GPS signals in the CDMA mobile phone using the time offset.