A digital filtering method and device for LTE carrier

Abstract

The invention discloses a digital filtering method and a digital filtering device for aiming at an LTE carrier wave. The method comprises the following steps of adjusting a sampling rate of an input signal and / or an output signal for satisfying a system requirement; according to the signal bandwidth, setting the signals with bandwidths which are not larger than 5MHz to one group, and processing by a filtering module A; and setting the signals with bandwidths which are larger than 5MHz to the other group, and processing by a filtering module B; performing further processing on the signal which is processed by the filtering module B through a time delay adjusting module, thereby ensuring time delay consistency of the filtering module A and the filtering module B; and finishing carrier wave bandwidth resolution, controlling switching between the filtering module A and the filtering module B and controlling the time delay adjusting module by a control module. The digital filtering method and the digital filtering device can settle a problem of real-time switching for the carrier waves with different bandwidths for filtering in certain LTE receiver devices, thereby reasonably reducing designing complexity of a filtering system.

Description

technical field [0001] The invention belongs to the technical field of filtering of wireless communication systems, and in particular relates to a digital filtering method and device for LTE carriers. Background technique [0002] The LTE (Long Term Evolution) project is an evolution of 3G, which improves and enhances the air access technology of 3G. Adopt OFDM and MIMO as the only standards for its wireless network evolution. The main performance goals of 3GPP LTE include: providing a peak rate of downlink 100Mbps and uplink 50Mbps in a 20MHz spectrum bandwidth; improving the performance of cell edge users; increasing cell capacity; reducing system delay; supporting paired or unpaired spectrum, and flexible Configure six bandwidths, namely: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz. [0003] FIR (Finite Impulse Response) filter, finite-length unit impulse response filter, also known as non-recursive filter, is the most basic unit in a digital signal processing system. Its ...

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Problems solved by technology

[0006] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a digital filtering method for LTE carriers, which can solve the problem of real-time switching of multiple bandwidth carrier filters in some specific LTE receiver equipment, and realize The optimal effect of FPGA processing speed and resource occupation, reasonably reducing the design complexity of the filtering system

[0007] Another object of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a digital filter device for LTE carriers, which can solve the problem of real-time switching of multiple bandwidth carrier filters in some specific LTE receiver equipment, and realize The optimal effect of FPGA processing speed and resource occupation, reasonably reducing the design complexity of the filtering system

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