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The 8PSK signal symbol synchronization algorithm and structural studies

Author: ZhengTingGuang
Tutor: LvYouXin
School: University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: Symbol synchronization Maximum likelihood estimation Non - data-aided The structure of the high-speed parallel Overlapping retention law
CLC: TN911.2
Type: Master's thesis
Year: 2008
Downloads: 329
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Abstract


8PSK signal is a multi- band digital phase modulation signal has higher spectrum efficiency . Better demodulation performance relative to the differential demodulation with coherent demodulation , select coherent demodulation . Traditional coherent demodulation requires two quadrature with the phase slip , which increases the difficulty of understanding tone to achieve , the paper presents a single quadrature -phase branch coherent demodulation scheme . Timing synchronization is one of the key technologies in digital communications , but also one of the difficulties in digital communications , the merits of the symbol synchronous demodulation performance of the system has a great influence . On the basis of the analysis used in modern communication symbol synchronization method , the phase-locked method in the self-synchronization method , and select a common phase-locked law , i.e. the PLL method -GARDNER algorithm based on the interpolated its algorithm design , simulation and analysis of results ; Secondly, the law of self-synchronization method of filtering , analysis of the five kinds based on the maximum likelihood estimation NDA nonlinear algorithm , algorithm design , simulation and analysis of results , select a relatively good performance and is suitable for high-speed parallel structure algorithm , and the algorithm improvements to enhance the estimated accuracy of the algorithm . Through in-depth study of high-speed parallel demodulation structure , according to the filter characteristics and signal processing theory , a simplified program to improve the structure of the realization of high-speed parallel demodulation , the simulation results show that the system feasible . The main work of this paper include : 1 . Proposed the single orthogonal Road coherent demodulation algorithm . Analysis from both synchronization method of phase-locked method and filtering method timing synchronization method and timing synchronization algorithm design . Improved parallel demodulation structure . 4 software simulation and analysis of results .

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