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System and method for inhibiting OFDM peak-to-average ration by combining pulse shaping with digital pre-distortion

A technology of digital predistortion and pulse shaping, applied in the field of reducing OFDM peak-to-average ratio, can solve the problems of transmission signal spectrum diffusion, memory nonlinear distortion, nonlinear distortion, etc., to improve signal-to-noise ratio, increase transmit power, power amplifier Effects with a large linear range

Inactive Publication Date: 2018-03-06
SPACE STAR TECH CO LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a system of pulse shaping combined with digital predistortion to suppress OFDM peak-to-average ratio, which can solve the problem of severe nonlinear distortion and spectral spread of transmission signals caused by high PAPR in nonlinear transmission channels, and OFDM signal The wideband characteristics cause the power amplifier to produce memory nonlinear distortion, which causes the problem of increased bit error rate

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  • System and method for inhibiting OFDM peak-to-average ration by combining pulse shaping with digital pre-distortion
  • System and method for inhibiting OFDM peak-to-average ration by combining pulse shaping with digital pre-distortion
  • System and method for inhibiting OFDM peak-to-average ration by combining pulse shaping with digital pre-distortion

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[0048] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] Such as figure 1 As shown, the present invention designs a pulse shaping combined with digital predistortion suppression OFDM peak-to-average ratio system, including a transmission path and a reception path, wherein the transmission path includes an input data module, a modulation module, a serial-to-parallel conversion module, Inverse Fourier transform module, precoding matrix P module, parallel-to-serial conversion module, insertion CP module, digital predistortion DPD module, digital-to-analog converter DAC module, power amplifier PA module, attenuator module, analog-to-digital converter ADC module , a digital pre-distortion training network module, and an adaptive algorithm module, wherein the output of the digital pre-distortion DPD module makes a difference with the output of the digital pre-distortion train...

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Abstract

The invention relates to a system and method for inhibiting an OFDM peak-to-average ration by combining pulse shaping with digital pre-distortion. For the problem that the OFDM signal high peak-to-average ratio produces serious nonlinear distortion and transmission signal spectrum diffusion in a nonlinear transmitting channel, on the one hand, the high PAPR of the OFDM is reduced by using the phase shaping technology starting from the signal construction of the OFDM; on the other hand, the linear range of a power amplifier is improved by using the self-adaptive digital pre-distortion technology starting from the nonlinear power amplifier performance, therefore, a method of combining the pulse shaping technology with the self-adaptive digital pre-distortion technology is proposed, the requirement on the transmitting channel linearity by the high PAPR of the OFDM signal is reduced; a simulation result shows that the PAPR of the OFDM signal is small, the power amplifier linear range is large, so that the transmitting power of the signal can be increased, the signal-to-noise ratio of the system is indirectly improved,, thereby effectively improving the system performance.

Description

technical field [0001] The invention relates to a system and method for pulse shaping combined with digital predistortion to suppress OFDM peak-to-average ratio, and belongs to the technical field of reducing OFDM peak-to-average ratio. Background technique [0002] OFDM technology has the advantages of high spectral efficiency, fast transmission rate and resistance to frequency selective fading. Therefore, OFDM technology has been successfully applied to WIMAX, WLAN, WMAN (Wireless Metropolitan Area Networks) and other systems, and has become the LTE physical layer standard, but OFDM signals have high PAPR, and high PAPR produces serious problems in nonlinear transmission channels. Nonlinear distortion and spectral spread of transmitted signals. At the same time, the broadband characteristic of OFDM signal causes the power amplifier to generate memory nonlinear distortion, which increases the bit error rate and reduces the performance of OFDM system. [0003] There are th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/49
CPCH04L25/49H04L27/2614
Inventor 谷林海徐燕刘江春
Owner SPACE STAR TECH CO LTD
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