Peak value offset method and device based on peak value elimination

Abstract

The invention discloses a peak value offset method based on peak value elimination, comprising the steps of: generating a combination peak clipping pulse by convolution of a peak value window and peak clipping filters, and carrying out the peak clipping treatment on OFDM (Orthogonal Frequency Division Multiplexing) signals by utilizing the combination peak clipping pulse. The invention also discloses a peak value offset device, comprising a peak value window determination unit, a first peak clipping filter, a second first peak clipping filter, a first peak value offset unit and a second peak value offset unit. In the invention, the combination peak clipping pulse is the convolution result of the peak value window and the peak clipping filters, so the shape of the peak clipping pulse can be better matched with the shape of the peak value window whether the peak value offset device is installed in a full configuration OFDM system or in a discontinuous configuration OFDM system. Therefore, better peak clipping effect can be realized.

Description

technical field [0001] The invention relates to a peak-to-average ratio reduction technology in an OFDM system, in particular to a peak cancellation method and device based on peak cancellation. Background technique [0002] The application of Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology has greatly improved the spectrum utilization, but the OFDM signal usually has a higher peak-to-average ratio (PAPR, Peak to Average Power Ratio), so that the analog devices ( Including ADC-AanalogDigital Convertor, HPA-High Power Amplifer, transmit filter, etc.) have high linearity requirements. When the amplitude fluctuation of the OFDM signal exceeds the dynamic range of HPA linear amplification, intermodulation interference (in-band) and out-of-band radiation between subcarriers will occur. Therefore, reducing the PAPR of the OFDM signal can improve power utilization and enhance system performance. [0003] At present, there a...

AI Technical Summary

Problems solved by technology

However, under full configuration and non-continuous configuration, the spectral characteristics of OFDM symbols will be quite different. If an appropriate peak clipping filter is designed according to different spectral characteristics, the complexity of real-time implementation will be high.

Usually, in the peak cancellation algorithm in the TD-LTE system, the peak clipping filter is designed according to the spectrum of the OFDM symbol in the full configuration, so the peak clipping pulse can well match the peak value of the OFDM symbol in the full configuration The pulse shape has a good peak clipping effect at this time; and when the base station transmits a discontinuous configuration, it is difficult for the peak clipping pulse to match the peak pulse shape of the OFDM symbol in various situations. In this case, the peak clipping The effect is very poor, and the purpose of peak cutting cannot be achieved

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