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26-01-2021 | Issue 2/2021

Wireless Personal Communications 2/2021

Understanding the Time and Frequency Varying Characteristics of a Multipath Wireless Channel

Journal:
Wireless Personal Communications > Issue 2/2021
Authors:
Ikram E Khuda, Umair Farooq, Mansoor Ebrahim, Kamran Raza
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Abstract

Designing a spectrally efficient wireless channel requires a comprehensive understanding of its time and frequency varying characteristics, making it a stochastic medium of communication. These characteristics become more challenging to cater at the receiving terminal in a multipath transmission. This is because of the fading effect and Doppler shift of the transmitted frequency, specifically in cellular mobile radio systems and vehicle to vehicle communications. This paper presents the modeling, simulation, and then characterization of a cellular mobile radio multipath channel over its time and frequency varying fading gain. For this purpose, a discrete-time Finite Impulse Response (FIR) type filter of such a channel is designed, modeled, and simulated using time and frequency varying characteristics of the received signal. The simulated channel response is further analyzed in terms of coherence bandwidth, coherence time, delay spread, Doppler spread, and symbol time.

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