发明名称 |
SYNCHRONIZATION FOLLOW-UP CIRCUIT |
摘要 |
<P>PROBLEM TO BE SOLVED: To provide a synchronization follow-up circuit by which a problem caused under low speed or high speed fading of the conventional synchronization follow-up circuit is solved; and synchronization follow-up performance can be improved regardless of traveling speed by applying a control corresponding to the traveling speed. <P>SOLUTION: The synchronization follow-up circuit has: a traveling speed presumption section outputting a traveling speed presumption value by presuming the traveling speed from phase state information; an equalization control section prolonging a phase difference equalization time under a high-speed fading environment by corresponding to the traveling speed presumption value and shortening the phase difference equalization time under a low-speed fading environment and outputting the phase difference equalization time to an equalization section; and a diffusion code generation section outputting a diffusion code with the generation phase of the diffusion code controlling in sample number unit in accordance with the phase state information generated from a comparator. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
申请公布号 |
JP2004235822(A) |
申请公布日期 |
2004.08.19 |
申请号 |
JP20030020189 |
申请日期 |
2003.01.29 |
申请人 |
HITACHI KOKUSAI ELECTRIC INC |
发明人 |
SASAKI KOHEI |
分类号 |
H04B1/707;H04B1/7085;H04B7/26;H04L7/00;H04W56/00 |
主分类号 |
H04B1/707 |
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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