Low-complexity implementing method and apparatus for base-band forming SRRC digital filter

Abstract

The invention relates to a device and a method of realizing low complexity of the base band forming SRRC digital filter. The device comprises the following: a double channel reuse tap delay line unit delays a double channel composite input signal to obtain an input vector x; an order inverting unit inverts the order of the input vector x; an input strobing unit time-sharing strobes the input vector x and an order inverted vector x`; a number of M weighted sum units reuse in time division a weighted sum arithmetic device of the x and a half coefficient hia of a sub-filter, and the x` and the half coefficient hia of the sub-filter; after a summation delaying unit completes setting delaying of the output of the x`. hia operation, the summation delaying unit sums with the output of the x. hia operation which is synchronous with the x`. hia operation; and an adapter unit time-sharing strobes the filter operation result of each sub-filter to obtain a double channel forming filter result of the SRRC digital filter. The device retrenches the length of the tap delay line as 1 / (2M) of the original length, so the hardware resources needed by the base band forming SRRC digital filter to realize low complexity are remarkably reduced, the complexity is lowered, the filter operation can work in lower frequency, and the aim that I / Q double channel reuse the same filter device is realized.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and relates to the realization of digital filters, in particular to a low-complexity realization device and method of baseband shaping SRRC digital filters. Background technique [0002] The baseband post-processing part of the digital communication system transmitter usually requires time-domain shaping filtering. According to the best detection theory, the filters at both ends of the transceiver should be conjugate matched, so the system function of the shaping filter at the sending end and the matching filter at the receiving end should be designed to satisfy the Nyquist distortion-free criterion, that is, H T (f).H R (f)=H(f), where H T (f) is the frequency response of the shaping filter at the sending end, H R (f) is the frequency response of the matched filter at the receiving end, and H(f) is a system function that satisfies the no-distortion criterion at the sampling ...

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a new baseband shaping SRRC digital filter low-complexity implementation method and implementation device, to overcome the baseband shaping SRRC digital filter, especially high-order filters in various programmable logic devices, digital signal processing devices Or the traditional implementation devices in ASICs have many shortcomings such as high complexity, large hardware resource occupation, and high operating frequency.

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