发明名称 |
CARRIER RECOVERY CIRCUIT AND CARRIER RECOVERY METHOD |
摘要 |
PROBLEM TO BE SOLVED: To provide a carrier recovery circuit that recovers carriers excellently even under the circumferences that a reception state of an inputted digital modulation wave is bad. SOLUTION: In a carrier recovery circuit where after a complex multiplier 8 frequency-converts an input digital modulation wave into a 1st frequency conversion signal by using a 1st recovery carrier signal, a complex multiplier 11 frequency-converts the 1st frequency conversion signal into a 2nd frequency conversion signal by using a 2nd recovery carrier signal, an AFC loop controls the frequency of the 1st recovery carrier signal and a PLL loop phase-locks the 2nd recovery carrier signal to the input digital modulation wave, a phase detector 18 detects a phase error of the frequency conversion signal after a low frequency component is suppressed by low pass suppressing filters 16, 17 and a frequency detector 19 detects a frequency error of the 2nd frequency conversion signal from the phase error. |
申请公布号 |
JPH11355370(A) |
申请公布日期 |
1999.12.24 |
申请号 |
JP19980154638 |
申请日期 |
1998.06.03 |
申请人 |
TOSHIBA CORP;TOSHIBA AVE CO LTD |
发明人 |
KOMATSU SUSUMU;NISHIKAWA MASAKI;SUGITA YASUSHI |
分类号 |
H04L27/227;H04L7/00;H04L27/22 |
主分类号 |
H04L27/227 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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