Simulation Of Adaptive Demodulation Application On The Design Of Transceiver

In order to enhance anti-electromagnetic interference and decrease bit error rate, On the design of military transceiver it's very important to use the optimize project. With the rapid development of wireless communication technology, it is a new subject researched at present how to enhance the quality in the complicated communication environment. How to understand the correlation of parameters and its influence in communication system is the essential task in the research of communication system.Through carrying on research and analysis to various kinds of adaptive algorithms, this paper is focus on the application of the algorithm in demodulation in the digital signal carrier transport. The DPSK signals demodulation basing on adaptive algorithm is improved on and a new method is presented for QDPSK and QAM signals demodulation by adaptive filter.System View is a comprehensive dynamic systems analysis environment for the design and simulation of communication systems. The simulation system of modulation and demodulation is built under the environment of dynamic simulation software System View and the simulation experiment of imitating physical environment is made , and it makes analysis of simulation result in performance.Main content of the dissertation include:Introduces the general situation of System View, including auxiliary tools for various communication systems design and emulation, its main functional module bases, uses, features and suitable fields. System View is given in the matter of its characteristic and main function.A brief introduction of adaptive algorithm. the modules of adaptive algorithms are created in System View such as LMS, NLMS, and NDLMS .etc.The simulation systems of modulation and demodulation for DPSK and QDPSK signals is created in System View in preparation for analyzing and researching adaptive demodulation.The coherent demodulation and adaptive demodulation are both realized in these forementioned systems in System View, and the corresponding theory is proved by analyzing and comparing in simulation. The method is given to solve the problem in adaptive demodulation that adjudgement will worsen when the SNR is low. By using the error signals to reduce the demodulated signals, the bit error rate will be improved...