MSK/GMSK (Gaussian Filtered Minimum Shift Keying) coherent demodulation processing system

Abstract

The invention discloses an MSK / GMSK (Gaussian Filtered Minimum Shift Keying) coherent demodulation processing system, so as to provide a coherent demodulation processing system which can reduce the complexity of an MSK / GMSK signal demodulation algorithm and improve the signal demodulation performance. According to the technical scheme of the invention, an MSK / GMSK signal demodulation end is in parallel connection with two low pass filters through two 90-DEG phase shifters in a quadrature demodulation module to form a closed loop circuit; the output end of the closed loop circuit is sequentially in serial connection with a post decoding signal demodulation module and an information conversion module through a baseband signal synchronization module to form an MSK / GMSK coherent demodulation system; the baseband signal synchronization module compensates the initial phase of the obtained MSK / GMSK baseband discrete complex signals to zero phase, the signals are then fed to the post decoding signal demodulation module, a real part value and an imaginary part amplitude value are extracted alternatively for each baseband signal; and the information conversion module converts a real number signal no larger than 0 to be a bit 0 and a real number signal larger than 0 to be a bit 1, information bit data are obtained and outputted to subsequent information processing.

Description

technical field [0001] The invention relates to a minimum frequency shift keying / Gaussian minimum frequency shift keying MSK / GMSK coherent demodulation processing system for air-to-ground and air-to-air wireless communications in the field of mobile communications. Background technique [0002] At present, in the digital communication system, the all-digital receiver has been widely used. It is an important technology in modern communication to design the modulation and demodulation technology in the communication system with the digital method. It is very important for the performance of the communication system to select an appropriate and efficient modulation and demodulation method according to the channel characteristics. It often involves the effectiveness and reliability of communication system transmission. For digital communication systems, availability and reliability are actually transmission rates and error rates. As the key technology in the communication sys...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the deficiencies existing in the prior art, to provide a kind of operation is simple, can reduce the MSK / GMSK signal demodulation algorithm complexity, improve the MSK / GMSK coherent demodulation processing system of signal demodulation performance, in order to Solve the problem of improving receiver sensitivity in the improvement of MSK / GMSK signal reception performance in a large number of existing communication systems

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