Non-linear compensation circuit, transmission apparatus and non-linear compensation method

A non-linear compensation and non-linear technology, applied in the field of compensation circuits, can solve the problems that the distortion of the amplifier 303 cannot be fully compensated, and the compensation effect of the pre-corrector 301 is reduced, so as to achieve the effect of compensating the distortion
CN1578119AInactive Publication Date: 2005-02-09NEC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NEC CORP
Publication Date
2005-02-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

Nonlinearity correction circuit. This device has an amplitude converter which outputs the amplitude of the inputted complex baseband signals, a memory which outputs the inverse gain of the amplitude inputted as the address from the amplitude converter, an inverse number converter which outputs the inverse number of the inputted memory output, an FIR filter which filters the output signal of the inverse number converter, an inverse number converter which outputs the inverse number of the inputted FIR output, and a complex multiplier which performs a complex multiplication of the complex baseband signals and the output of the inverse number converter. To provide a device and a method of reducing the distortions caused by memory effects for nonlinearity corrections by multiplying the reverse characteristics of the nonlinear characteristics of the amplifier and the input signals in the base band.
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Description

technical field

[0001] The present invention relates to a circuit and method for non-linear compensation of amplifiers used in mobile communications, and more particularly to compensation circuits and methods when the amplifier has a characteristic called memory effect. Background technique

[0002] In digital mobile communication in recent years, in order to improve anti-jamming ability, CDMA (Code Division Multiple Access) communication mode is widely adopted. In the CDMA communication mode, because the instantaneous power is much higher than the average power, in order to reduce the power leakage of adjacent channels, it is necessary to maintain the linearity of the high output power amplifier on the transmitting side under very high output strength. Therefore, the structure of the amplifier becomes complicated, the cost is high, and the power consumption also increases.

[0003] For this reason, in the baseband part, a technique of pre-correction using nonlinearity as a...

Claims

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