A Continuously Variable Rate Digital Shaping Filter Processing Method

Abstract

The invention provides a digital-shaping filtering method for a continuous and variable speed. The digital-shaping filtering method for the continuous and variable speed comprises the steps that (1) a one-time data clock signal A1 and an N-time data clock signal AN are generated through a digital NCO, (2) an input signal is received according to the data clock signal A1, (3) N-time zero-fill interpolation is conducted on the received signal by means of the data clock signal AN, (4) the signal subjected to interpolation is filtered by means of a digital shaping filter, and (5) variable-sampling-rate interpolation filtering is conducted on the signal subjected to shaping filtering. According to the continuous variable-speed digital-shaping filtering method, the shaping filter with the fixed coefficient and an interpolation filter with a variable coefficient are used for shaping filtering and interpolation filtering respectively, shaping filtering and interpolation filtering of different speed signals can be achieved, the method can be applied to a digital modulator with continuous and variable data speed, the filtering method is easy to realize, hardware resource consumption is low, and practicability is high.

Description

technical field [0001] The invention relates to a digital shaping filter processing method, in particular to a continuously variable rate digital shaping filtering processing method. Background technique [0002] In modern wireless communication systems, in order to effectively use the channel, the signal spectrum must be compressed before the signal is transmitted, so as to improve the frequency band utilization under the premise of eliminating inter-symbol interference and achieving the best detection. Pulse-shaping filtering for baseband data is an effective way to improve spectrum utilization. With the continuous development of wireless communication systems, the transmission signal rate is often required to be variable or even continuously variable. For example, satellite communication systems usually change the transmission rate according to the application bandwidth requirements. [0003] In the existing digital shaping filter design, since the output sampling rate o...

AI Technical Summary

Problems solved by technology

In order to meet the requirement of variable data rate, one method is to change the DA working clock by reconfiguring the clock chip according to the rate of data transmission, this method is limited by the hardware platform; another method is to use multiple Integer multiple interpolation filtering is carried out by using a multi-stage filter. This method has many filter stages, complex structure, huge resource consumption, and the data rate cannot be continuously variable.

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