发明名称 |
Mobile telephone with a demodulation circuit having an improved local oscillator |
摘要 |
<p>The system uses a correction applied to the local oscillator, in response to measurement of base station transmissions. In order to resolve the problem of ageing of a local oscillator and its consequent drift, in a mobile telephone, a shift is applied (6) to the oscillator frequency (Fi). A measurement is made of the FCH type frequency signal received from the base stat in order to determine the precise frequency being used for the communication. In response to this measurement the local frequenc adjusted in order to match the required transmission frequency. A correction circuit is used, with an algorithm provided to pred the correction which must be applied in order to achieve the desired frequency.</p> |
申请公布号 |
EP1052782(A1) |
申请公布日期 |
2000.11.15 |
申请号 |
EP20000401220 |
申请日期 |
2000.05.04 |
申请人 |
ALCATEL |
发明人 |
PARISEL, ARNAUD;DUGAST, XAVIER |
分类号 |
H04B1/26;H03B5/32;H04B1/30;H04B1/38;H04L27/22;H04L27/233;(IPC1-7):H04B1/30 |
主分类号 |
H04B1/26 |
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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