Lookup table pre-distortion method based on orthogonal frequency division multiplexing signal amplitude characteristics
A technology of multiplexing signals and orthogonal frequency division is applied in the field of lookup table predistortion based on the amplitude characteristics of orthogonal frequency division multiplexing signals. The effect of good convergence, strong adaptability and good applicability
Inactive Publication Date: 2013-09-11
SUZHOU IND PARK CHANGCHEN COMM TECH
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Problems solved by technology
In the adaptive lookup table predistortion system, there will be a problem that the update of the lookup table is not synchronized, which will affect the final iterative result and reduce performance
[0011] In addition, since there is no reference to the amplitude statistical characteristics of the OFDM signal, the linear index method in the prior art needs to look up a large number of table entries, and needs to know the saturation amplitude of the power amplifier, which cannot resist the drift of the saturation point of the power amplifier.
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[0032] Detailed reference will be given below to examples of the present invention. Although the present invention has been illustrated and illustrated by these embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, the invention covers all alternatives, modifications and equivalents which are within the spirit and scope of the invention as defined by the appended claims.
[0033] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, means, components and circuits are not described in detail so as to highlight the gist of the present invention.
[0034] figure 1 Shown is a schematic diagram of a lookup table. As shown in the figure, in the look-up table predistortion meth...
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The invention discloses a lookup table pre-distortion method based on orthogonal frequency division multiplexing signal amplitude characteristics. The lookup table pre-distortion method at least comprises the following steps: first obtaining amplitude of input signals; then obtaining a corresponding lookup table address according to the obtained amplitude of the input signals and equiprobability conditions; and finally obtaining pre-distortion factors stored in the corresponding lookup table address, and performing pre-distortion treatment on the input signals according to the pre-distortion factors. By adopting the lookup table pre-distortion method based on the orthogonal frequency division multiplexing signal amplitude characteristics, cost and complexity of a predistorter can be reduced, and power efficiency of a power amplifier is improved.
Description
technical field [0001] The invention relates to the broadband communication neighborhood, in particular to a look-up table predistortion method based on the amplitude characteristic of an orthogonal frequency division multiplexing signal. Background technique [0002] RF power amplifier (RF power amplifier, referred to as RF power amplifier) is used to amplify the modulated signal to the required power, and then transmit the signal through the antenna. It is an indispensable key component in modern wireless communication systems, but the RF power amplifier itself With non-linear characteristics, especially in broadband communication, RF power amplifier shows memory effect. According to the Wiener model, the memory distortion of the power amplifier can be expressed as a finite impulse response (Finite impulse response, FIR for short) filter connected in series with a memoryless power amplifier. Both nonlinear distortion and memory distortion seriously affect the normal tra...
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IPC IPC(8): H04L27/26H04L25/49
Inventor 任智源张海林杨栋武德斌王涛宁
Owner SUZHOU IND PARK CHANGCHEN COMM TECH