| Due to the complex channel environment of wireless communication, signal interms of time, frequency and phase are affected by all kinds of interference anddestruction, which often lead to receiving signal loading frequency and phase offset.This requires that the signal receiver use the carrier synchronization technology to repairthe damage. Therefore, carrier synchronization technology is the guarantee ofinformation precision transmission, can reduce the system error rate, and is an importantmeans to improve the quality of communication.According to project requirements of the simulation software, do the research forwireless communication of digital modulation signal using fast carrier synchronizationalgorithm. The simulation analyze the estimation range, estimation precision andapplicable communication scenarios of various algorithms. Using the softwaredevelopment platform based on MFC to implement the key technology. Through thetypical test cases, verifying the function of the software platform and key performanceindicators.First of all, carrier synchronization is analyzed in theory. Making a brief analysis ofdefinition of the synchronization technique in the digital communication system and theimportance of synchronization. The research status of carrier synchronizationtechnology is discussed. By way of example to describe the traditional receivers andfully digital receivers synchronization method, along with theoretical derivation andperformance analysis. In order to measure the carrier synchronization performance ofthe system, Cramer-Rao Bound is studied.Secondly, the forward without feedback fast carrier frequency synchronizationalgorithm and carrier phase synchronization algorithm are studied. According to signalmodel of the receiver, maximum likelihood estimation of carrier frequency and phaseparameter are analyzed, summarized and classified the existing carrier synchronizationalgorithm. Do the monte-carlo simulation of frequency synchronization and phasesynchronization algorithms. Study algorithm of estimation accuracy and estimationrange etc. characteristics. Then, in the form of a software to make the synchronization algorithmimplementation. According to the mapping of software function, divides the softwarehierarchy and the specific module. Software interface, software business, softwarestorage and software level internal key function are designed in detail.Finally, do the software functional testing and performance testing. By analyzingthe frequency deviation and phase deviation estimates and bit error rate performance ofthe system, summarize the validity and accuracy of synchronization algorithm. Testresults show that in the AWGN channel, compared with the theoretical value, after thecarrier synchronization of signal demodulation ber performance, the deterioration ofperformance within the scope of1dB, meet the project requirements.Based on the background of wireless communication digital modulation carriersynchronization technology, mainly studies the fast carrier synchronization algorithmfor digital modulation signal, and make the algorithm to implementation in the form ofsoftware, the software test results show that the algorithm scheme meet the needs of theproject. Carrier synchronization software simulation platform is designed using C/C++language, can be applied to the carrier synchronization technology research, softwareteaching system and hardware-in-the-loop simulation. Based on thisbackground,engineers can also add and modify each function module in thecommunication system and the underlying algorithm. At the same time, the software hasguidance meaning for communication product research and development. |
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