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Short time burst communication carrier synchronization method based on signal forward-reverse order cyclic splicing

A carrier synchronization and burst communication technology, applied in the field of communication, can solve problems such as unstable loops and difficulties in coherent demodulation solutions

Active Publication Date: 2018-08-24
NANJING UNIV OF SCI & TECH
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Problems solved by technology

For short-term burst signals, the use of coherent demodulation involves the introduction of a phase-locked loop. When the signal duration is very short, the loop is not stable enough to bring great difficulties to the coherent demodulation scheme.

Method used

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  • Short time burst communication carrier synchronization method based on signal forward-reverse order cyclic splicing
  • Short time burst communication carrier synchronization method based on signal forward-reverse order cyclic splicing
  • Short time burst communication carrier synchronization method based on signal forward-reverse order cyclic splicing

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Embodiment Construction

[0035] The invention utilizes Verilog HDL language to implement the technical scheme in the ISE14.7 development tool, and simulates with ModelSim software to verify the correctness of the synchronization scheme.

[0036] refer to figure 1 In the structure, the received short-term burst signal is first stored, and when the storage is over, the stored intermediate frequency signal is cyclically spliced ​​to form a new signal, which is sent to the subsequent Costas loop for phase locking ring processing. Figure 1 Inside the dotted line block diagram is the classic Costas ring loop structure. In this structure, the mutually orthogonal sin and cos branch data generated by the local NCO are multiplied by the received intermediate frequency signal and then passed through a low-pass filter to obtain Two channels of baseband data (I channel and Q channel), and then multiply the I and Q two channels of data to complete the purpose of phase detection, and then pass the phase detection ...

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Abstract

The invention discloses a short time burst communication carrier synchronization method based on signal forward-reverse order cyclic splicing. According to the method, the carrier synchronization purpose is mainly achieved by storing a received short time burst signal, circularly using signals entering a digital receiver in the forms of forward order and reverse order based on the idea of backtracking to ensure the phase continuity, and continuously performing phase-locked loop processing. By adoption of the signal forward-reverse order cyclic splicing method, the carrier synchronization can still be completed under the condition that the received data length is very short, and the problem of phase mutation when the received data are processed is well solved.

Description

technical field [0001] The invention relates to carrier synchronization technology in the communication field, and is aimed at the carrier synchronization technology in short-time burst communication. Background technique [0002] In a digital receiver, the output signal-to-noise ratio of the coherent demodulation scheme is 3dB higher than that of the non-coherent demodulation scheme, and the demodulation performance is better, but the synchronization deviation of frequency and phase in the coherent demodulation will cause significant deterioration of the bit error performance . The key technology in realizing the coherent demodulation scheme is the carrier synchronization technology, that is, a local oscillation with the same frequency and phase as the carrier of the received signal is generated in the receiving device. According to the principle of synchronous parameter compensation, carrier synchronization technology can be divided into two types: open-loop feedforward m...

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Application Information

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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026H04L2027/0053H04L2027/0069
Inventor 韩玉兵刘琪琥王楠
Owner NANJING UNIV OF SCI & TECH
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