Gaussian filter with self-adaptive data rate

Abstract

The invention discloses a Gaussian filter with the self-adaptive data rate. The Gaussian filter with the self-adaptive data rate is a digital Gaussian filter based on an application look-up table method and formed by an N-system counter, an M-N decoder, a Gaussian ROM and a parallel recombiner. Particularly, according to the Gaussian filter with the self-adaptive data rate, the input end of the N-system counter is connected with output of a self-adaptive frequency divider, input of the self-adaptive frequency divider is a bit rate of a clock signal and an input signal, frequency division is performed on the clock signal to make the clock signal be N times of the bit rate, output of the self-adaptive frequency divider and a base band signal are jointly connected into synchronization frequency, a phase and the starting and stopping time of a synchronizer, and output of the synchronizer and output of the N-system counter are jointly connected into a caching device; output of three continuous code elements of the caching device is connected into the Gaussian ROM, and meanwhile the middle code element output of the caching device is connected into the parallel recombiner. When the digital Gaussian filter is applied for performing modulation, the number of sampling points, the counter, the decoder and the like can be kept unchanged according to the input signals of different bit rates, and the digital Gaussian filter has universality and is small in amount of stored data.

Description

technical field [0001] The invention relates to a minimum frequency shift keying modulation technology, in particular to a Gaussian filter modulation technology capable of adapting to the bit rate of an input signal, and belongs to the field of signal modulation. Background technique [0002] The Gaussian filter minimum frequency shift keying modulation technology is a digital modulation method developed on the basis of MSK modulation. Reduce the hopping energy when two carriers of different frequencies switch, so that the channel spacing can become closer at the same data transmission rate. Since the digital signal is pre-modulated and filtered by Gauss before modulation, the modulated signal is not only phase-continuous at the crossing zero point, but also filtered smoothly, so the spectrum of the signal modulated by GSMK is compact and the bit error characteristics are good. [0003] The Gaussian filter commonly used in the market applies the structure of discretization ...

AI Technical Summary

Problems solved by technology

[0008] Considering the various deficiencies and demands of the above-mentioned existing Gaussian filter, the present invention proposes a Gaussian filter with adaptive data rate to solve the adaptive problem of different bit rates of the input signal

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