Mstar Semiconductor, Inc.

Yu-Tai Chang

Chi-Yuan Peng

Ping-Hung Chiang

Wei-Jen Chen

Steve Wiyi Yang

Francesc Boixadera

Chun-Jung Wu

Fabien Petitgrand

Chih Yu Chen

Chia Sheng Peng

Chao-Yuan Hsu

Li-Ping Yu

Tai-Li Chiang

Huan-Hsiu Tseng

A frequency adjustment method is provided for adjusting a frequency of a reference oscillating signal from an initial oscillation frequency to an adjusted oscillation frequency. The frequency adjustment method includes steps of: dividing a frequency scan section into M scan frequencies; down-converting a signal according to the M scan frequencies to obtain M down-converted signals; performing a correlation calculation operation on the M down-converted signals, respectively, to obtain M correlation results; grouping the M scan frequencies into N frequency groups each containing P selected frequencies, with the P selected frequencies corresponding to P consecutive scan frequencies; performing a group calculation on the N frequency groups, respectively, to obtain N group calculation results; and selecting a target frequency group from the N frequency groups according to the N group calculations results, and obtaining the adjusted oscillation frequency from the target frequency group.

Frequency adjustment method

A method for estimating a frequency difference between a transmission terminal and a reception terminal according to a reception signal is provided. The method includes steps of: in a first period, receiving and storing a first part of the reception signal; in a second period, frequency shifting the first part of the reception signal according to an L number of sweep frequencies, and correspondingly obtaining multiple first part correlation results, where L is a positive integer; in the second period, receiving and storing a second part of the reception signal; in a third period, frequency shifting the second part of the reception signal according to the L number of sweep frequencies, and correspondingly obtaining multiple second part correlation results; and estimating the frequency difference according to the first and second part correlation results.

Method for estimating frequency difference

A wireless communication device is a mobile station of a wireless communication network system. In an idle mode, when the wireless communication device enters a startup state from a sleep state to prepare for receiving a paging message, base station (BS) measurement is performed at least once before the paging message is received.

Wireless communication device and power saving method thereof

A communication device including a receiving unit and a decision-making unit is provided. The receiving unit receives a first burst in a paging message provided from a base station. After comparing a signal-to-noise ratio to a threshold, the decision-making unit decides, based on the comparison result, the judging mechanism for judging whether the paging message is a dummy paging message. The signal-to-noise ratio is associated with the channel via which the first burst passed.

Communication device and control method thereof

The present invention provides a global positioning system (GPS) and a method for implementing the system. The GPS includes a control unit, a GPS RF processing circuit and a storage unit. The control unit includes a microprocessor and a mask ROM storing reference information. The GPS RF processing circuit is coupled to the control unit for receiving an RF signal, transforming the RF signal into a base-band or an intermediate frequency signal and transmitting the base-band or the intermediate frequency signal to the control unit. The storage unit is coupled to the control unit to temporally store a program code. The microprocessor executes the program code and refers to the reference information to achieve global positioning.

GPS with mask ROM, control IC of the GPS and method for implementing the same

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Hsinchu, Taiwan

Yu-Tai Chang