发明名称 |
Dual band architectures for mobile stations having transmitter linearization feedback |
摘要 |
This invention teaches methods and apparatus for providing a low cost, low complexity, and low component count transmitter feedback function for use in mobile station transmitter linearization and self-test operations. Disclosed is a method for operating a mobile station of a type that includes a transmit chain having an output coupled to an antenna and a receive chain having an input coupled to the same or a different antenna. The method includes steps of: during a transmission time, (a) sampling an amplified signal prior to the amplified signal being applied to the antenna for transmission from the transmit chain; (b) downconverting a frequency of the sampled amplified signal to a lower frequency signal using a receive chain local oscillator signal normally used for downconverting a received signal to the first IF; and (c) demodulating the lower frequency signal to a baseband signal with a receive chain demodulator by using a second local oscillator signal that is normally used as a transmit chain modulator injection frequency signal. A further step of the method determines from the baseband signal an amount of predistortion of an input signal to the transmit chain in order to obtain a desired amount of linearization of the amplified signal.
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申请公布号 |
US6125266(A) |
申请公布日期 |
2000.09.26 |
申请号 |
US19970001776 |
申请日期 |
1997.12.31 |
申请人 |
NOKIA MOBILE PHONES LIMITED |
发明人 |
MATERO, JORMA;KANANEN, KARI |
分类号 |
H04B1/40;H03C3/08;H03F1/32;H04B1/04;H04B1/26;H04L27/20;H04L27/36;(IPC1-7):H01Q11/12 |
主分类号 |
H04B1/40 |
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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