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Doppler Effect in Mobile Wireless Networks

Explore characteristics and modeling of wireless channels in mobile wireless networks, focusing on Doppler spread effects and frequency shifts caused by mobility. Understand Doppler spread function and its impact on signal transmission in various propagation environments.

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Doppler Effect in Mobile Wireless Networks

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  1. ECEN 621-600 “Mobile Wireless Networking” Course Materials: Papers, Reference Texts: Bertsekas/Gallager, Stuber, Stallings, etc Grading (Tentative): HW: 20%, Projects: 40%, Exam-1:20%, Exam-II:20% Lecture notes and Paper Reading Lists: available on-line Class Website: http://ece.tamu.edu/~xizhang/ECEN621/start.php Research Interests and Projects: URL:http://ece.tamu.edu/~xizhang Instructor: Professor Xi Zhang E-mail: xizhang@ece.tamu.edu Office: WERC 331

  2. Characterizations and Modeling of the Wireless Channel Lecture Notes 9.

  3. Doppler spread effect and Doppler spread function • Both non-linear and time-varying system introduce new frequency components other than those existing in the input signal • In wireless propagation environments, mobility of mobile users and/or surrounding scatterers, the channel is linear but time variant  introduce frequency shifts to transmitted signal • This phenomenon of adding new frequency shift to transmitted signal is call Doppler Effect and introduced frequency shifts are called Doppler Shifts ECEN 621, Mobile Wireless Networks

  4. Input/output model of Wireless Channel Linear time-variant (LTV) channel ECEN 621, Mobile Wireless Networks

  5. Doppler frequency dispersion • Both non-linear and time-varying system introduce new frequency components other than those existing in the input signal • In wireless propagation environments, mobility of mobile users and/or surrounding scatterers, the channel is linear but time variant  introduce frequency shifts to transmitted signal • This phenomenon of adding new frequency shift to transmitted signal is call Doppler Effect and introduced frequency shifts are called Doppler Shits ECEN 621, Mobile Wireless Networks

  6. Doppler-spread function • Both non-linear and time-varying system introduce new frequency components other than those existing in the input signal • In wireless propagation environments, mobility of mobile users and/or surrounding scatterers, the channel is linear but time variant  introduce frequency shifts to transmitted signal • This phenomenon of adding new frequency shift to transmitted signal is call Doppler Effect and introduced frequency shifts are called Doppler Shits ECEN 621, Mobile Wireless Networks

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