The Ricean K-factor Measurement And Doppler Spectrum Research Under High-speed Rail Environment

This thesis mainly focuses on the estimation of the Ricean K-factor, as well as the Doppler spread in the wireless channel. After a brief analysis of mobile channel characteristics, this thesis made a detailed introduction and analysis of Ricean K-factor estimation algorithms domestic and international, including the envelope-based method, the ML method, the IF-based, and so on. This thesis also discusses the influence of Gaussian white noise on Ricean K-factor estimation and the solution method. Computer simulations and performance analysis are carried out. On the basis of these algorithms, TD-LTE frame structure is taken into consideration, then the performance of Ricean K-factor estimation algorithms application in TD-LTE system with this special frame structure are analyzed.On the other hand, the Doppler spectrum expansion is researched and two common spectrum expansion types are studied as examples. The thesis studies the relationship of spectrum expansion and the autocorrelation function, and the spectrum expansion can be estimated use the autocorrelation function. The TD-LTE frame structure is also taken into the research, and the feasibility in the special structure and time buttress was analyzed. Finally, several commonly used methods of estimating the maximum Doppler spread are studied and analyzed by computer simulation.