Method and device for processing digital predistortion

Abstract

The invention discloses a method and device for processing digital predistortion. The method comprises the steps of: respectively filtering a radio-frequency signal of each frequency band; collecting the nonlinear intermodulation distortion of each frequency band; synchronizing the nonlinear intermodulation distortion of each frequency band with the input signal of the frequency band; and updating digital predistortion factors by utilizing the synchronized signals. In the invention, through respectively filtering the radio frequency of each frequency band and carrying out common digital predistortion processing on digits, a high efficient digital predistortion processing effect of the digital predistortion can be achieved under the condition of low-complicated hardware.

Description

technical field [0001] The invention relates to signal processing technology, in particular to a digital pre-distortion processing method and device. Background technique [0002] According to the frequency band planned by China Mobile, it is divided into four frequency bands: F / A / D / E, as follows: [0003] Table: F / A / D / E four-band planning [0004] [0005] The future broadband RRU (Radio Remote Unit, radio remote unit) needs to meet the shared antenna of these four frequency bands, and the common hardware platform of A+F frequency bands, which greatly saves hardware cost and hardware design complexity. However, at present, the industry only achieves 30MA+F applications, and there is no official product for D-band / E-band continuous 50MHz. [0006] The application of broadband RRU will inevitably become the mainstream if the mixed mode is adopted, that is, TD (Time Division, time division) and LTE (Long Term Evolution, long-term evolution) share the platform. The applic...

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Problems solved by technology

[0015] The existing technology is difficult to solve the feedback problem. For example, the feedback of A+F generally needs to adopt ZIF (Zero-IF, zero intermediate frequency) mode or use 500MHZ non-real-time ADC (Analog-Digital Converter, analog-to-digital converter) for signal acquisition

However, it is generally difficult to solve the problem of I / Q imbalance by using ZIF, and using a 500MHZ non-real-time ADC for signal acquisition, on the one hand, this ADC cannot be shared with the normal receiving channel, on the other hand, the price is relatively expensive, making the entire RRU product price Can't get down

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