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Gaussian minimum shift keying (GMSK) signal receiving method in satellite mobile communication

A technology for satellite mobile communication and signal reception, which is applied in the direction of synchronous signal speed/phase control, multi-carrier system, multi-frequency code system, etc., and can solve problems such as low-complexity demodulation of GMSK signals

Active Publication Date: 2013-12-04
PLA UNIV OF SCI & TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for receiving GMSK signals in satellite mobile communications, solve the difficult problems encountered in the application of GMSK signals in satellite mobile channels, and realize high-performance and low-complexity reception of GMSK signals, including signal arrival detection, frequency and Fast estimation of delay and low-complexity demodulation of GMSK signal

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  • Gaussian minimum shift keying (GMSK) signal receiving method in satellite mobile communication
  • Gaussian minimum shift keying (GMSK) signal receiving method in satellite mobile communication
  • Gaussian minimum shift keying (GMSK) signal receiving method in satellite mobile communication

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Embodiment Construction

[0058] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0059] combine Figure 1 to Figure 8 , each frame consists of a set of frequency correction bits, several packets of information, and a unique code. At the beginning of each frame, bits are corrected for frequency and delay. In this solution, dual Chirp signals are used for signal arrival detection, carrier frequency difference and delay estimation, and timing synchronization while correcting carrier frequency. After the frequency correction bit, a packet of unique code is inserted between every two packets of information to realize symbol-level timing and channel impulse response estimation.

[0060] Step 1: Perform signal arrival detection on the received signal to determine whether the burst signal has arrived:

[0061] The dual Chirp signal sent by the sending end, the dual Chirp signal is composed of a frequency sweep signal with a positive slope and a...

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Abstract

The invention discloses a GMSK signal receiving method in satellite mobile communication. The method comprises that firstly, double-Chirp signal assistance is conducted to perform system synchronization, by the aid of the method, the Doppler frequency and the time delay existing in a satellite mobile channel can be estimated quickly and accurately, and the system synchronization can be achieved; on the basis of completion of the system synchronization, a quasi-coherent algorithm is used for performing GMSK signal demodulation, according to the method, before the GMSK demodulation is performed at a transmitting end, 'precoding' is performed on raw information, and meanwhile, a 'de-rotation' module is added at a receiving end to simplify the design of timing synchronization greatly. The method is low in implementation complexity and low in performance loss. Performance test results of hardware implementation indicate that the relative loss of the bit error rate (BER) performance of the GMSK receiving method to the binary phase shift keying (BPSK) optimal coherent detection performance is about 0.7-0.8dB.

Description

technical field [0001] The invention belongs to the field of satellite communication, and in particular relates to a method for receiving GMSK signals in satellite mobile communication, which is used to solve the problems of fast acquisition of signals, Doppler frequency and time delay estimation, and high complexity of GMSK signal demodulation in the satellite mobile communication system , suitable for application in satellite mobile communication systems, can greatly improve system performance and save precious power resources. Background technique [0002] The satellite mobile communication system can support small terminals such as hand-held devices, and has become an extremely important strategic and tactical communication means in modern warfare. In the satellite mobile communication system, due to the relative motion between the terminal and the satellite, there are multipath effects and shadow effects, the transmission channel exhibits Rice or Rayleigh fading charact...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38H04L7/04
Inventor 刘爱军张邦宁潘克刚童新海郭道省潘小飞叶展赵坤龚超王杭先刘贤方华王庚润王恒
Owner PLA UNIV OF SCI & TECH
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