Radio communication device and method of bit synchronization pull-in in the same

A radio communication device including:

• (a) a radio-receiving circuit which receives a radio signal, and transmits a demodulated signal and a phase-indicating signal in accordance with the received radio signal;
• (b) a clock-generating circuit which generates a data-receiving clock;
• (c) a data-receiving circuit which receives said demodulated signal in accordance with said data-receiving clock;
• (d) a phase-difference detecting circuit which receives the phase-indicating signal and detects a difference in phase between said phase-indicating signal and said data-receiving clock;
• (e) a phase-difference correcting circuit which varies a correction for a phase of said data-receiving clock in accordance with said difference in phase detected by said phase-difference detecting circuit;
• and
• (f) a maximum correction establishing circuit which establishes a maximum correction for the phase of said data-receiving clock,
• wherein said phase-difference correcting circuit makes the correction for the phase of said data receiving clock equal to said maximum correction, when the difference in phase between said phase-indicating signal and said data-receiving clock is equal to or greater than said maximum correction, and makes the correction for the phase of said data-receiving clock equal to the difference in phase between said phase-indicating signal and said data-receiving clock, when said difference in phase is smaller than said maximum correction.

A method of establishing synchronization in a radio communication device, including the steps of:

• (a) receiving a radio signal and generating a demodulated output signal and a signal indicative of a phase of the received radio signal;
• (b) generating a data-receiving clock;
• (c) receiving the demodulated output signal in accordance with said data-receiving clock;
• (d) detecting a difference between said signal indicative of a phase of the received radio signal and said data-receiving clock;
• (e) establishing in advance a maximum correction for a phase of said data-receiving clock;
• and
• (f) variably correcting a phase of said data-receiving clock in accordance with a difference in phase between said received radio signal and said data-receiving clock,
• wherein the correction for the phase of said data-receiving clock is equal to said maximum correction, when the difference in phase between said received radio signal and said data-receiving clock is equal to or greater than said maximum correction, and the correction for the phase of said data-receiving clock is equal to the difference in phase between the received radio signal and said data-receiving clock, when said difference in phase is smaller than said maximum correction.

A method of establishing synchronization in a radio communication device, including the steps of:

• (a) receiving a radio signal, and transmitting a demodulated signal and a phase-indicative signal in accordance with the thus received radio signal;
• (b) generating a data-receiving clock;
• (c) detecting a difference in phase between said phase-indicative signal and said data-receiving clock;
• (d) establishing a maximum correction for a phase of said data-receiving clock;
• (e) varying a correction for the phase of said data-receiving clock in accordance with said difference in phase;
• and
• (f) receiving said demodulated signal in accordance with said data-receiving clock having a phase having been corrected in said step (e), wherein said step (e) is comprised of:
• (e1) comparing said difference in phase to said maximum correction;
• and
• (e2) selecting a smaller one between said difference in phase and said maximum correction in accordance with a result of said step (e1), and determining the thus selected smaller one as the correction for the phase of said data-receiving clock.