Method and device for estimating DPD coefficients

Abstract

The invention discloses a method and device for estimating DPD coefficients. The method and device are used for solving the problem that the DPD coefficients are extremely slow in update speed. The method comprises the steps that a first coefficient matrix and a first forward matrix are calculated; the first coefficient matrix and the first forward matrix are equally divided into sub coefficient matrixes and sub forward matrixes respectively according to set line numbers and the number of elements larger than or equal to a set threshold value in the first forward matrix and the number of elements larger than or equal to the set threshold value in each sub forward matrix are counted respectively; the peak value density of each sub forward matrix is calculated; according to the obtained peak value density, the corresponding sub forward matrixes are fused, so that a second forward matrix is obtained and the corresponding sub coefficient matrixes are fused, so that a second coefficient matrix is obtained; an autocorrelation matrix is calculated according to the second coefficient matrix, a cooperated correlation matrix is calculated according to the second coefficient matrix and the second forward matrix, and the DPD coefficients are estimated according to the autocorrelation matrix and the cooperated correlation matrix. The method for estimating the DPD coefficients is capable of improving the calculation efficiency of the DPD coefficients.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for estimating DPD coefficients. Background technique [0002] The wireless communication system is entering 3G and moving towards 4G in an all-round way. The power amplifier is a key component that affects the system performance and coverage in the communication system. The two inherent characteristics of the power amplifier are nonlinearity and memory effect. These two inherent characteristics will cause The growth of the filtered signal spectrum causes certain interference to the adjacent channel, and also causes distortion of the in-band signal, which in turn increases the bit error rate of the system. [0003] Therefore, linearizing power amplifiers can greatly improve their power efficiency, which is crucial for the development of wireless communication systems. In the prior art, methods for performing linear processing on a power amplifier include fee...

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Problems solved by technology

[0026] Embodiments of the present invention provide a method and device for estimating DPD coefficients, which are used to solve the difficulty in calculating the autocorrelation matrix R_uu and the co-correlation matrix R_uz encountered in the process of calculating the digital predistortion coefficient in the prior art due to the high complexity. When the signal power or signal shape changes greatly, adjust the DPD coefficient in time, so that the amplification of the signal power by the power amplifier is nonlinear, thereby reducing the problem of communication quality

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