A method for determining dpd coefficient, fpga and dpd processing system

Abstract

The application discloses a method and device for determining a DPD (Digital Pre-Distortion) coefficient, and a DPD processing system, which are used for improving a speed of calculating the DPD coefficient, so that the DPD coefficient can be timely updated to implement nonlinear compensation on a power amplifier, thereby improving signal quality. The method for determining the DPD coefficient, which is provided by the application, comprises the steps that: a FPGA (Field Programmable Gate Array) determines a forward matrix according to an input signal of the power amplifier, and determines a coefficient matrix according to a feedback signal of the power amplifier; the FPGA calculates an inverse matrix of an autocorrelation matrix of the coefficient matrix, and calculates a cross correlation matrix of the coefficient matrix and the forward matrix; and the FPGA determines the DPD coefficient according to the inverse matrix of the autocorrelation matrix of the coefficient matrix and the cross correlation matrix.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a method for determining DPD coefficients, an FPGA and a DPD processing system. Background technique [0002] RF Power Amplifier (Power Amplifier, PA) is the most important nonlinear device in wireless communication system, it has amplitude-amplitude distortion characteristics and amplitude-phase distortion characteristics, this nonlinearity will lead to spectrum expansion outside the signal band, thus affecting Adjacent channel interference can also cause in-band distortion of the signal, leading to an increase in the bit error rate of the system. Therefore, in order to meet the spectrum requirements, reduce the bit error rate, and improve the efficiency of the power amplifier in the wireless communication process, it is very necessary to linearize it. [0003] A commonly used technology for linearizing power amplifiers is digital pre-distortion (Digital ...

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Problems solved by technology

[0005] However, in a specific application system, the calculation of DPD coefficients requires a large amount of calculation, while in the prior art, a general-purpose processor (for example: ARM processor, DSP processor) is used as the carrier of calculation, and the calculation is performed in a serial manner , when the algorithm for calculating DPD coefficients is relatively complex, the operation speed cannot meet the requirements of updating DPD coefficients, resulting in too slow updating of DPD coefficients, and the DPD coefficients cannot be adjusted in time when the signal power or signal shape changes greatly, making the signal power Amplification is non-linear, resulting in reduced signal quality

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