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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

Inactive Publication Date: 2005-02-09
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] When such frequency dependence is large, the reference Image 6 and Figure 7 In the conventional circuit configuration described above, there is a problem that the compensation effect of the predistorter 301 is reduced, and the distortion of the amplifier 303 cannot be sufficiently compensated.

Method used

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

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no. 1 Embodiment

[0030] figure 1 A structural diagram showing a first embodiment of the present invention. figure 1 The structure shown, as a pre-orthodontator 301, is mounted on Image 6 shown in the transmitter.

[0031] refer to figure 1, the figure has: an amplitude converter 102, which inputs a complex baseband signal r(i) and outputs its amplitude; a memory 103, which stores and maintains the inverse characteristic of the input-to-output characteristic of the amplifier, constitutes a look-up table, and outputs the corresponding input address Inverse characteristic; the first reciprocal converter 104, which inputs the output from the memory 103 and outputs it, and outputs it after the reciprocal operation; FIR (finite impulse response) filter 105, which inputs the output signal of the first reciprocal converter 104, and performs filtering Output after operation; The 2nd reciprocal converter 106, the output of its input FIR filter 105, output after reciprocal operation; And complex n...

no. 2 Embodiment

[0062] Next, a second embodiment of the present invention will be described. Figure 4 It is a structural diagram showing the second embodiment. In this embodiment, the data stored in the memory 103' is used as the input-to-output characteristic of the amplifier, and thus also the gain characteristic of the amplifier. Therefore, it is possible to omit figure 1 The first reciprocal converter 104.

[0063] In this embodiment, the amplitude of the complex baseband signal is obtained by the amplitude converter 102, and the gain a(i) corresponding to the amplitude is output from the memory 103'. The FIR filter 105 performs filtering processing on the gain a(i). In the reciprocal converter 106, the reciprocal of the filtered gain w(t) is obtained. The complex multiplier 101 multiplies the complex baseband signal and the reciprocal output from the reciprocal converter 106 .

[0064] Figure 5 is explained in Figure 4 A flow chart of the processing procedure in the second emb...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H04B1/04
CPCH03F1/3247H03F3/24H03F2201/3224H03F2201/3233
Inventor 岩崎玄弥土居喜明
Owner NEC CORP
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