Portable radio terminal and AFC control method
AssigneeNEC Corporation
InventorsMariko Matsumoto, Shigeru Ono
Life of this patent
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Abstract
A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period when the frequency shift of the oscillation frequency is large. An AFC control method is also disclosed.
Claims4
A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling an oscillation frequency of an oscillator, comprising:
- means for monitoring a reception quality or sync state and determining in accordance with a result whether to input a frequency shift value to the oscillator.
A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling an oscillation frequency of an oscillator, comprising:
- means for intermittently performing AFC operation;
- and means for shortening an AFC operation stop period when a frequency shift of the oscillation frequency is large;
- and
- means for performing the AFC operation at a predetermined short period when said portable radio terminal fails in decoding, does not detect any pilot signal, or detects an out-of-sync state.
An AFC control method of realizing automatic frequency control (AFC) for automatically controlling an oscillation frequency of an oscillator, comprising:
- monitoring a reception quality or sync state and determining in accordance with a result whether to input a frequency shift value to the oscillator.
An AFC control method of realizing automatic frequency control (AFC) for automatically controlling an oscillation frequency of an oscillator, comprising:
- intermittently performing AFC operation, and when a frequency shift of the oscillation frequency is large;
- and shortening an AFC operation stop period,
- wherein the AFC operation is performed at a predetermined short period when decoding fails, no pilot signal is detected, or a step-out state is detected.
Dependencies are inferred from the claim text.