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Any-rate CPFSK (Continuous Phase Frequency Shift Key) signal timing synchronization method

A CPFSK and signal timing technology, which is applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problems that the synchronization performance cannot meet the MSD demodulation, and the phase detection curve is not ideal, so as to improve timing synchronization accuracy and increase guidance Overhead, low-complexity effects

Active Publication Date: 2015-12-23
10TH RES INST OF CETC +1
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Problems solved by technology

However, due to the use of local '1' and '0' likelihood detection sequences to detect the received signal separately, the phase detection curve obtained under low SNR is not ideal, and the synchronization performance cannot meet the requirements of MSD demodulation

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  • Any-rate CPFSK (Continuous Phase Frequency Shift Key) signal timing synchronization method
  • Any-rate CPFSK (Continuous Phase Frequency Shift Key) signal timing synchronization method
  • Any-rate CPFSK (Continuous Phase Frequency Shift Key) signal timing synchronization method

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Embodiment Construction

[0027] The invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] refer to figure 1 . The arbitrary rate CPFSK signal timing synchronization structure based on MSD decision feedback includes: resampling unit 1, MSD unit 2, feedback signal unit 3, correlation operation unit 4, coherent integration unit 5, code ring discriminator 6, loop filter 7 and Numerically controlled oscillator NCO8, wherein, the resampling unit 1 performs arbitrary down-sampling on the received CPFSK baseband signal according to the enable signal output by the NCO, and reduces the sampling rate of the CPFSK baseband signal to an integer multiple of the symbol rate; the resampled The signal is sent to the multi-symbol detection MSD unit 2, and the judgment result is obtained by using the MSD technology, and the feedback signal unit 3 processes the judgment result to obtain the feedback signal; the correlation operation unit 4 respectively compares...

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Abstract

The invention discloses an any-rate CPFSK (Continuous Phase Frequency Shift Key) signal timing synchronization method which is implemented according to the following technical scheme: an MSD unit demodulates baseband signals which are subjected to resampling processing, and a feedback signal unit carries out processing on a demodulation result so as to acquire feedback signals; a correlation operation unit carries out a correlation operation on the feedback signals and a leading branch, a real-time branch and a lagging branch of CPFSK signals, and a correlation result is subjected to coherent integration and then sent to a code ring discriminator so as to acquire phase discrimination information; a loop filter filters the phase discrimination information, and a filtering result is sent to an NCO; and a resampling unit adjusts an integration interval under control of output enable signals of the NCO, and the phase of the CPFSK signals is changed, thereby achieving a purpose of timing synchronization. According to the invention, advantages of MSD demodulation are utilized, a likelihood function envelope is detected to acquire a timing error, tracking is carried out on code Doppler by using a delay locked loop, and accurate CPFSK signal timing synchronization can be realized under a low signal to noise ratio.

Description

technical field [0001] The present invention relates to a timing synchronization technology in the field of wireless communication, in particular to a method for timing synchronization of an arbitrary rate continuous phase frequency shift keying (ContinuousPhraseFrequencyShiftKey, CPFSK) modulated signal based on multi-symbol detection (MSD) decision feedback. Background technique [0002] Continuous Phase Frequency Shift Keying (CPFSK) is a special case of Continuous Phase Modulation (CPM). Different from traditional modulation methods, the CPM modulation signal has no phase mutation at the moment of symbol alternation, which can minimize the spectrum width. At the same time, CPM is still a constant envelope modulation, which is not sensitive to the nonlinear effect of the power amplifier and can greatly save transmission power. [0003] Traditional CPM signals are usually demodulated by differential frequency discrimination. Although this method has a simple structure, it ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/152H04L7/027H04L7/033
CPCH04L7/0276H04L7/0332H04L27/152
Inventor 袁田马松仇三山
Owner 10TH RES INST OF CETC
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