A processing method and device for multi-band joint predistortion
A pre-distortion processing and pre-distortion technology, applied in the field of communication, can solve the problems of not considering the pre-distortion coefficient, the LUT table coefficient cannot be used together, and the LUT table quantization factor and quantization model are not given.
Active Publication Date: 2018-11-02
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology
The prior art mainly has the following two problems: 1. The predistortion coefficient of each frequency band signal is not considered for phase calibration when constructing the LUT table for multi-band signals. can not be used together
2. The quantization factor and quantization model of the LUT table are not given
In the prior art, there is no processing method for multi-frequency bands, that is, 3 frequency bands or the bandwidth of each frequency band is a broadband signal
Method used
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[0091] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0092] The embodiment of the present invention is based on the characteristics of the broadband discontinuous power amplifier, and considering the cross-modulation effect between the dual-frequency signals and the complexity of the model, a 2D-SDM-MP dual-band signal digital pre-distortion model is proposed, which will consider The 2D-DPD model of the cross-modulation term and the modified Volterra model are proposed. The model introduces a two-level temporal cross-term model on the basis of the 2D-DPD model. Among them, the first level is the time crossing model between channels, and the second level is the time crossing model within the channel. The two-level time crossing (2D-TCMP-DPD, Time Cross Memory Polynomial) model fully c...
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The embodiment of the invention provides a multi-band combination pre-distortion processing method and device, and the method comprises the steps: obtaining multi-band signals; employing the multi-band signals to form a multi-band broadband signal through a mode of two-stage frequency point moving, and carrying out overlapping at a moment before the pre-distortion of a band signal and at a moment long after the pre-distortion of the band signal, thereby forming the multi-band broadband signal; inputting the multi-band broadband signal into a preset channel, carrying out pre-distortion processing according to a corresponding channel pre-distortion model, and obtaining a pre-distortion signal; enabling the multi-band broadband signal to serve as a forwarding input signal; enabling the return signal of the obtained forwarding input signal after the obtained forwarding input signal enters into a power amplifier to serve as an output signal; and employing the input and output signals to determine a pre-distortion coefficient. The method and device can effectively solve a problem that various types of cross modulation and intermodulation, generated through the power amplifier in the broadband signal and among the multi-band signals, cause the distortion of the input signal.
Description
technical field [0001] The present invention relates to the technical field of communication, in particular to a multi-band joint pre-distortion processing method and a multi-band joint pre-distortion processing device. Background technique [0002] In wireless communication systems, PA (Power Amplifier, power amplifier) output is often required to have high linearity to meet the stringent requirements of the air interface standard, but linear PA is very inefficient and very expensive, while nonlinear PA is efficient but will Intermodulation interferes with adjacent channels. In order to improve the output efficiency of the PA and reduce the cost as much as possible, the nonlinear characteristics of the PA must be corrected, and DPD (Digital Pre-Distortion, digital pre-distortion) processing is usually performed on the input signal of the PA. The essence of digital predistortion is a compensation technology, which pre-determined anti-distortion on the amplitude and phase ...
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IPC IPC(8): H04L25/49
Inventor 熊军王杰丽孙亦嘉张永丽
Owner DATANG MOBILE COMM EQUIP CO LTD