Self-adapting digital predistortion method and apparatus for OFDM transmitter

A digital pre-distortion and self-adaptive technology, applied in the field of mobile communication, can solve problems affecting the compensation effect of digital pre-distortion

Active Publication Date: 2008-05-07
WUHAN HONGXIN TELECOMM TECH CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem that the memory effect of the broadband power amplifier brough

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  • Self-adapting digital predistortion method and apparatus for OFDM transmitter
  • Self-adapting digital predistortion method and apparatus for OFDM transmitter
  • Self-adapting digital predistortion method and apparatus for OFDM transmitter

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specific Embodiment

[0063] As shown in FIG. 1 , it is a schematic structural diagram of the adaptive digital predistortion of the OFDM transmitter of the present invention. The adaptive digital predistortion device of the OFDM transmitter includes a forward path and a feedback loop; wherein the forward path includes an OFDM baseband signal module 101, a digital predistortion synthesis processing unit 102, a DAC 103, a radio frequency transmitter 104 and a W-HPA105 ; Feedback loop includes radio frequency receiver 108, ADC 109. The OFDM baseband signal module 101 performs OFDM modulation on the data from the upper layer to generate OFDM baseband IQ data; as shown in FIG. 2 , it is a schematic diagram of the digital predistortion synthesis unit of the adaptive digital predistortion device of the present invention. The digital predistortion synthesis processing unit 102 includes a signal preprocessing module 102a, a digital predistortion kernel 102b and an adaptive processing module 102c. Among the...

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Abstract

The invention provides an adaptive digital pre-distortion technique and device which is suitable for OFDM projector. The device comprises an OFDM baseband signal module for orthogonal frequency division multiplexing technique, a digital pre-distortion synthetic process component, an analog and digital converter DAC, a radio frequency projector, a wideband high power amplifier, i.e., W-HPA, and a feedback circuit. Wherein, a digital pre-distortion internal core, which is structured in polynomial mode, implements pre-distortion process to the digital signals which have undergone signal pre-process; the estimate and uploading to an adaptive digital pre-distortion filter is implemented, based on hybrid algorithm which is the combination of training-sequence-based RLS+LMS algorithm or hybrid algorithm which is the combination of training-sequence-based QRD-RLS+NLMS algorithm. The invention can efficiently reduce the performance degradation of a wideband power amplifier caused by memory effect, improve the projecting performance of a base station system, and improve the linearity and the efficiency of the wideband power amplifier.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to an adaptive digital predistortion method and device suitable for OFDM transmitters. Background technique [0002] More and more user service requirements are the main factors driving the increase in bandwidth requirements. In the future, the next-generation mobile communication system called the third generation, or the fourth generation mobile communication (4G) , using a data service rate such as 100Mbit / s, the bandwidth for bearing services is generally not less than 20MHZ. The demand for higher signal bandwidth is becoming more and more common, which makes one of the technical difficulties of the transmitter in the next generation mobile communication system is to develop a pre-distortion system suitable for wideband power amplifiers based on OFDM transmitters, so as to improve the wideband power. The linearity of the amplifier and the purpose of improving the w...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B7/04
CPCY02D30/70
Inventor 王建新
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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