A digital predistortion processing method and device

Abstract

The embodiment of the invention provides digital predistortion processing (DPD) method and device. The method comprises the steps of receiving a feedback signal; determining absolute power threshold of peak abnormality detection according to average power of a training sequence and a relative power threshold of the peak abnormality detection; determining whether to perform digital predistortion processing according to the absolute power threshold. With the adoption of the method, the robustness of DPD processing can be improved.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a digital predistortion processing method and device. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is an efficient multi-carrier modulation technology, which is widely used in the field of broadband mobile communications. Since the OFDM transmission symbol is a linear superposition of multiple subcarriers, its envelope has a larger dynamic range when the input phase is consistent. Therefore, it is required that the power amplifier of the radio frequency must also have a large linear range, otherwise it will cause nonlinear distortion of the peak signal. The linearization ability of the power amplifier is directly related to the effectiveness of wireless communication, and the effective digital pre-distortion (Digital Pre-Distortion, DPD) technology can effectively combat the nonlinear problem of the radio frequency power amplifie...

AI Technical Summary

Problems solved by technology

The existing methods for judging the arithmetic and value of coefficients have insufficient theoretical basis in reflecting the working status of DPD. Therefore, the protection ability in terms of DPD quasi-out is relatively weak

[0010] As for the technical scheme of judging the peak-to-peak ratio of the feedback signal, due to the insufficient analysis of the characteristics of the feedback signal in the existing technology, the setting accuracy of the absolute detection threshold is very limited, which leads to the weakening of the DPD access protection ability of the existing technical scheme, which cannot be guaranteed Missed detection or false detection probability under working conditions

[0011] To sum up, in terms of signal detection, due to the randomness and complexity of the signal, there are certain differences and instability in the conditions under which the output signal after DPD causes the overload of the power amplifier. and DPD output signal for characteristic analysis; in terms of processing flow, the existing technology has insufficient restrictions on DPD start-up access and access conditions, and does not have sufficient in-depth pre-judgment for power amplifier abnormalities caused by external factors; in terms of fault handling, The existing technology only prints alarm information prompts through the console, and the abnormality of the whole process basically does not interfere with the DPD process. In severe cases, wrong signals will be directly poured into the power amplifier, which constitutes a hidden danger of successful amplifier overload.

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