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These parameters are largely within the control of the system designer and can be changed to optimize system performance. 1) is not entirely within the control of the system designer. This parameter is the propagation loss, which is discussed in the next section. 3 Distance Dimension: Propagation Loss The propagation loss refers to the attenuation that the signal suffers en route from the transmitter to the receiver. 1), the propagation loss includes three components: path loss, shadowing loss, and multipath fading.

Because there is now a relative motion between the transmitter and the receiver, the N reflected paths now experience a Doppler shift. 10 Relative motion between a transmitter and a receiver. 11 The relative motion between the transmitter and the receiver causes the received frequency of a single carrier to shift. Here the Doppler shift comes from a single carrier transmitted in free space. path experiences a frequency shift fD,n due to relative motion. 42) n =1 where θn is the phase of the nth signal path uniformly distributed between 0 and 2π, and s is a composite of N signal paths.

13 summarizes the impairments that have a physical cause of multipath. The phenomenon of multipath results in the delay spread τ, also known as time dispersion in the time domain. The delay spread τ results in a frequency selective channel in the frequency domain, and that channel is characterized by coherence bandwidth Wc. The delay spread introduces ISI in time and results in a frequency selective channel in frequency. Of course, if there is no multipath, there is no delay spread in the time domain, and then the channel in frequency is a frequency flat channel.

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