A data acquisition method in a digital predistortion system

Abstract

The invention discloses a data acquisition method in a digital predistortion system, which comprises the following steps: 1. A parallel processing device collects and samples a transmission signal, and a serial processing device determines the starting position of a frame; 2. The serial processing device searches for the maximum The value determines the frame start position and transmits the frame synchronization start position to the parallel processing device; 3. The parallel processing device starts the long-time histogram statistical module to count the amplitude distribution of each frame of the transmitted signal; 4. The parallel processing device collects the transmitted signal And save the transmission signal of short time length and transmit it to the serial processing device with the amplitude histogram of long-term statistics; The similarity of the amplitude histogram that has been counted for a long time, if the similarity is higher than the threshold, the pre-distortion coefficient is calculated, otherwise, the similarity is discarded and the data is reacquired from the parallel processing device. It has the advantages of strong adaptability and so on.

Description

technical field [0001] The invention relates to a data acquisition technology, in particular to a data acquisition method in a digital predistortion system. Background technique [0002] With the development of wireless communication, the signal bandwidth is getting wider and wider, and its envelope fluctuation and peak-to-average ratio are getting bigger and bigger, which puts forward higher linearity requirements for broadband signaling channels, especially mixers and power amplifiers. This is mainly because semiconductor devices have unavoidable nonlinear characteristics under large signals. When a broadband transmitter works in the nonlinear region, serious intermodulation components will be generated, and large spectrum leakage will be generated outside the band, so that it will not Comply with the requirements of 3GPP's emission spectrum template. [0003] How to improve the linearity of the system is an important problem to be solved in the broadband system. The most...

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Problems solved by technology

The main problem of this hardware implementation method is: because the interface speed of the serial processing device to receive data is relatively slow, and the time unit for the serial processing device to calculate the pre-distortion coefficient is seconds, while the speed of the pre-distortion processing is usually several Hundreds of MHz, which means that it is impossible for the serial processing device to calculate and update the pre-distortion coefficient in real time, so the serial processing device can only update the pre-distortion processing coefficient intermittently, that is, to collect the input and output signals of a power amplifier to calculate the pre-distortion coefficient , and then pass the coefficients to the pre-distortion processing module, the whole process takes nearly one second, so the pre-distortion processing coefficients used by the current pre-distortion processing module are calculated from the input and output data of the power amplifier one second ago

However, the changes of modern mobile communication signals are very fast. Usually, the length of a frame is on the order of milliseconds. With the access and exit of users, the amplitude of mobile communication signals changes greatly. At the same time, due to the storage resources of parallel processing devices and serial processing devices However, the length of the data used to calculate the pre-distortion coefficient is usually only microseconds long, so collecting the optimal data and providing it to the serial processing device to calculate the pre-distortion coefficient is a key step to improve the performance of the pre-distortion, but the existing pre-distortion related patents This method is not yet provided in

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