Title:
AUTOMATIC FREQUENCY-CORRECTING METHOD AND COMMUNICATION CONTROL METHOD IN RADIO COMMUNICATION TERMINAL
Document Type and Number:
Japanese Patent JP3179344
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To attain the correct and stable control of reception and transmission by correcting the frequency error twice in the synchronizing part of a reception signal when synchronization is established.
SOLUTION: After a first error check routine has ended, a correction control part 105 executes the second error check routine or an error correction routine by a same frame synchronization part. A frequency error signal is checked in the Bitsync 2 period of the same frame synchronizing part. When the error between the detection level, obtained by a demodulation output level detecting equipment 112 and a prescribed level value is within a permissible range, a correction control part 105 outputs a transmission permitting signal to a transmission control part 106. In the meantime, when the difference between the obtained detection level and the prescribed level value exceeds the permissible range, the correction control part 105 outputs a transmission- prohibiting signal to the transmission control part 106 and also reads LO correction data from a memory 114. Then, a generated LO control signal is analog-converted and outputted to a local oscillator 110, and a reception local oscillation frequency LORX is corrected.
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Inventors:
Yoshihide Uda
Application Number:
JP18833396A
Publication Date:
June 25, 2001
Filing Date:
June 28, 1996
Export Citation:
Assignee:
Shizuoka NEC Corporation
International Classes:
H03L7/06; H03J7/04; H04B1/26; H04L7/06; H04L27/22; H04L7/04; H04L7/10; (IPC1-7): H04L27/22; H04L7/06
Domestic Patent References:
| JP6350505A | ||||
| JP583312A | ||||
| JP33432A | ||||
| JP63253741A | ||||
| JP63117519A | ||||
| JP58187046A | ||||
| JP58186245A |
Attorney, Agent or Firm:
Yuuji Katsuragi