Predistortion device and method

A pre-distortion and pre-distortion processing technology, applied in the field of communication, can solve the problems of no multi-carrier to propose an effective solution, high implementation complexity of the pre-distortion device, no pre-distortion method, etc., to save resources, reduce the amount of calculation, Eliminate the effect of intermodulation of all orders

Active Publication Date: 2008-04-16
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

The patent published in the United States, the patent application number is 11/063,447, uses the forward gain mapping method, because the method needs to perform matrix inversion operation to obtain the pre-distortion parameters, so the pre-distortion device has high complexity and involves heavy computation
[0006] In addition, the existing pre-distortion technology is mainly aimed at the Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access) of the Frequency Division Duplex (FDD:

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[0046] The present invention proposes that the predistortion processing can be divided into two steps, namely the initial predistortion processing operation and the normal predistortion processing operation. These two steps will be described in detail below.

[0047] 1. Initial predistortion processing operation

[0048] The initial predistortion processing operation is performed when the system is initially started / or restarted. There is no predistortion processor during system initialization, only the lookup table (LUT, Look Up-Table) update processor (also called adaptive filtering)器). This is a direct training structure that uses the original input data to compare with the data returned by the PA for adaptive filtering, and the trained data is stored in the LUT.

[0049] The present invention can adopt such as figure 1 The block diagram shown implements the processing of the initial stage predistortion operation. During the initial predistortion process, due to the initial st...

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Abstract

The invention provides a predistortion device and a method. An input data is treated by a high speed predistortion and a digital signal is obtained by the feedback of a power amplifier. The result obtained from the parameter relation transformation of a digital signal is compared with the digital signal obtained from the process in which the input data is treated by the high speed predistortion and delayed. When the specification error requirement is satisfied, the related parameter in the parameter relation transformation is updated and saved in a lookup table as a predistortion parameter. The invention can use a uniform predistortion structure in an initial predistortion treatment and a normal predistortion treatment. Adopting the predistortion structure of an indirect discipline parameter, the invention collects data in a descending time slot and proceeds adaptive filtering treatment in an ascending time slot in a mobile communication system of a time division duplex, such as TD-SCDMA and OFDM_TDD system.

Description

technical field [0001] The present invention relates to the communication field, in particular to a predistortion device and method suitable for TDD systems. Background technique [0002] The mobile communication system needs to adopt a linear modulation scheme, such as: code division multiple access (CDMA, code division multiple access) using QPSK, M-QAM, and the like. If the scheme uses a linear power amplifier, the efficiency is low; if a high-efficiency non-linear amplifier is used, the emerging frequency components will interfere with adjacent channels. Although the signal is processed by pre-distortion, it can be greatly improved when passing through the nonlinear region of the power amplifier, which also greatly improves the efficiency of the power amplifier. However, the processing of pre-distortion is very difficult, and it is necessary to understand the distortion characteristics of a power amplifier (PA, Power Amplifier), and the change mode of this characteristi...

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Application Information

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IPC IPC(8): H04B1/707H04B7/005H03F1/32H04L25/49
CPCY02B60/50Y02D30/70
Inventor 熊军段滔
Owner DATANG MOBILE COMM EQUIP CO LTD
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