Adaptive pre-distorter in OFDM system and pre-distortion method

A technology of predistorter and adaptive algorithm, applied in multi-frequency code system, synchronization/start-stop system, etc.

Active Publication Date: 2009-07-08
SPACE STAR TECH CO LTD
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Problems solved by technology

Among them, there are some solutions that can well correct the nonlinear effect of the power amplifier, but it is difficult to achieve an optimal balance between algorithm complexity and performance.

Method used

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  • Adaptive pre-distorter in OFDM system and pre-distortion method
  • Adaptive pre-distorter in OFDM system and pre-distortion method
  • Adaptive pre-distorter in OFDM system and pre-distortion method

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Embodiment Construction

[0065] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0066] figure 2 It is a structural diagram of the adaptive predistorter in the OFDM system of the present invention. The system combines the non-direct learning structure in the polynomial predistortion method with the look-up table adaptive predistortion method. The predistorter of the present invention includes a first predistortion unit 1. The second pre-distortion unit, two pre-distortion look-up table units, an error signal calculation unit and an adaptive algorithm unit.

[0067] Wherein the first pre-distortion unit performs an input OFDM source signal v according to the first look-up table storing pre-distortion coefficients i (n) Perform pre-distortion processing, and the pre-distortion processed signal v d (n) respectively sent to the error signal calculation unit and the external digital-to-analog converter DAC unit; the second pre-d...

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Abstract

The invention relates to a self-adapting predistorter and a self-adapting predistortion method in an Orthogonal Frequency Division Multiplexing (OFDM) system comprising error calculation of signals after once predistortion processing and twice predistortion processing for OFDM source signals, self-adapting iteration operation of error signals and renewal of predistortion coefficients which enable the error signals to approach to zero. The self-adapting predistorter of the invention includes a first predistortion unit, a second predistortion unit, an error signal calculation unit and a self-adaptive algorithm unit. The technical scheme of the invention effectively expedites convergence rate of a query table at the same time of not increasing the algorithm complexity, obtains smaller mean error and simultaneously reduces the algorithm hardware implementing complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an adaptive predistorter and a predistortion method in an OFDM system. Background technique [0002] Compared with traditional communication technologies, OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier modulation technology has high spectral efficiency, strong bandwidth expansion, anti-multipath fading, flexible allocation of spectrum resources, and simpler implementation of MIMO technology. The advantages. Therefore, as a technology that can save frequency band resources and provide high-quality data communication services, OFDM is regarded by almost all manufacturers and operators of fixed wireless devices, and its good technical performance makes it widely used in many fields application. For example, in the field of digital broadcasting such as DAB, DVB-T system in Europe, CMMB system in radio and television and DTMB system in Chi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/49
Inventor 邢玥邹光南程子敬尹浩琼
Owner SPACE STAR TECH CO LTD
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