GMSK signal generator with variable symbol rate

Abstract

The invention discloses a GMSK signal generator with variable symbol rate, and aims to provide a generator which is fast in rate, high in generality, and can generate signals at any rate. A control unit configures functional modules based on parameters. An information processing module and a pre-coding module generate modulation data according to the modulation parameters distributed by the control unit. According to the symbol rate of a shaping filtering module, a multilevel interpolation module selects the corresponding interpolation level; and a gain compensation module selects the corresponding gain compensation based on the multilevel interpolation module and performs low-pass filtering. An MSK modulation module performs MSK modulation on the output signals of the gain compensation module to obtain I and Q baseband signals that are orthogonal each other. A Farrow filtering module performs sampling rate conversion on the I and Q baseband signals. A carrier wave modulation module adds the I and Q baseband signals after multiplying the I and Q baseband signals by carrier wave cosine and sine components and outputs GMSK bandpass signals. A D / A module performs digital analog conversion on the GMSK signals output by the carrier wave modulation module.

Description

technical field [0001] The invention belongs to the field of measurement and control communication, and relates to a Gauss minimum frequency shift keying (GMSK) signal generator device with a variable symbol rate. technical background [0002] With the development of modern communication technology and the rapid development of mobile communication technology, many excellent modulation technologies have emerged, among which Gaussian filter minimum shift keying (GMSK) technology is a prominent binary modulation method in wireless communication. With good power spectrum characteristics and good anti-interference performance, it is especially suitable for wireless communication and satellite communication. At present, many communication standards have adopted GMSK technology, such as GSM, DECT and so on. In our country's digital communication system, all-digital receivers have been widely used. Designing modulation and demodulation technology in communication system by digital ...

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Problems solved by technology

[0005] The object of the present invention is to aim at the deficiencies in the prior art, to provide a GMSK signal generation device with low consumption of hardware resources, fast implementation rate, strong versatility, and adaptability to multiple rates, so as to solve the problems of the prior art GMSK generation method In , the same device cannot adapt to the generation of arbitrary rates, resulting in complex circuits and difficulties in universal design

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