多節(jié)點協(xié)同信號調(diào)制識別與參數(shù)估計關(guān)鍵技術(shù)研究與實現(xiàn)
[Abstract]:With the rapid development of the wireless communication technology, the electromagnetic environment is becoming more and more complex, and the electromagnetic spectrum monitoring plays a more and more important role in the optimization management of the spectrum resources, and the network-based electromagnetic spectrum monitoring is increasingly concerned by its unique advantages. Modulation identification and parameter estimation are the key technologies in electromagnetic spectrum monitoring, and most of the existing research is based on a single monitoring node. How to use multiple nodes in the networked monitoring system to carry out cooperative modulation identification and parameter estimation has become an important problem. In this paper, the method of multi-node cooperative modulation recognition and parameter estimation using signal characteristic layer information is studied in this paper, and the related engineering implementation is carried out. The main work and innovation point of the thesis have the following three aspects: 1. In order to solve the problem of limited performance and limited energy of the monitoring node in the low signal-to-noise ratio of the multi-node cooperative method based on the characteristic layer, an improved method based on the high-order cumulant feature is proposed. In this chapter, four high-order cumulant features are proposed for signal set {4ASK, 2PSK, 4PSK, 8PSK, and 6QAM}. and then combining the proposed high-order cumulant features, aiming at the shortcomings of the existing multi-node method, an improved multi-node coordination method is proposed. according to the anti-noise performance and the calculation characteristic of the high-order cumulant feature, the average operation amount of the node can be minimized under the premise of ensuring the performance, and each feature is only extracted once. The simulation results show that the improved method is better than the original method in the different signal-to-noise ratio environment, and the calculation amount is reduced. Aiming at the problem of poor performance of the existing symbol rate estimation method in low signal-to-noise ratio, a signal characteristic spectrum with symbol rate information is proposed, and the symbol rate estimation is completed by extracting the characteristic spectrum line. and combining the characteristic spectrum to the characteristics of time delay, frequency offset and phase deviation, and the method for estimating the multi-node cooperative symbol rate based on the spectrum synthesis is designed. firstly, the characteristic of a discrete spectral line is existed at the symbol rate by utilizing the frequency spectrum of the signal after the square of the mould, the signal is taken as the abscissa and the Fourier coefficient mode value is the characteristic spectrum of the ordinate, the characteristic spectrum line corresponding to the symbol rate is searched by a specific spectral line extraction method, and then the symbol rate estimation is completed. The method is suitable for MASK, MPSK and MQAM signals. The simulation results show that the symbol rate estimation performance of the method is better than the haar wavelet transform and the cyclic spectrum method, and the calculation amount is effectively reduced compared with the cyclic spectrum method. and then a multi-node cooperative symbol rate estimation method based on the spectrum synthesis is provided by using the characteristic spectrum. according to the signal-to-noise ratio calculation weight value of each node receiving signal and weighting the characteristic spectrum of a plurality of nodes, and carrying out symbol rate estimation by using the composite spectrum. The simulation results show that the estimation performance of the characteristic spectrum synthesis method is better than that of the feature value synthesis method and the single node method. Design and implementation of multi-node cooperative electromagnetic spectrum monitoring system. In this chapter, based on the research of the previous text, the multi-node cooperative electromagnetic spectrum monitoring system is designed and implemented in combination with the function requirement of the electromagnetic spectrum monitoring. The general scheme of the system is firstly designed, including the network structure, the monitoring node structure, the processing flow and the hardware platform of the signal processing unit, and then the DSP programming of the algorithm such as signal detection, modulation recognition and parameter estimation is completed for the signal processing flow. Based on the functional requirements of the system, the interface module and the multi-task module of the DSP are designed, and the corresponding debugging is carried out. Finally, the system is tested by the function test and the actual service test, the result of the test is in accordance with the theoretical study, and the expected index requirements are met, and the feasibility of the whole system is verified.
【學(xué)位授予單位】:解放軍信息工程大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN911.3
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