Sony Corporation

Yoshihisa Takahashi

Takayasu Muto

Jason Sanmiya

A communication device, able to establish synchronization of frequency and able to continuously track a carrier even if an oscillation frequency of an oscillator changes. The device changes the oscillation frequency of a reference frequency oscillator according to established protocols when the base station of the other party in communication changes by generating a frequency change signal for reporting that the base station has changed and the frequency is changed and outputting it to a control unit of a GPS baseband unit.

Communication device

A communication device can reliably find a frequency and establish frequency synchronization, despite relying on a variable reference frequency, and may do so, e.g., by searching only during one or more periods of frequency stability. Once gained, such synchronization may be held continuously. An acquisition unit receives from a control unit information about a frequency change of a reference signal. The acquisition unit may nonetheless continue to search for, e.g., a satellite at the frequency that had been in use before the frequency change of the reference signal. An acquisition unit in such a device may search over extended periods, e.g., by using two or more frequency-stable periods. The acquisition unit may, e.g., transmit information about a change in the reference frequency to a tracking unit to maintain synchronization with the satellite.

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Kanagawa, Japan

Yoshihisa Takahashi