By Dr Byeong Gi Lee, Daeyoung Park, Hanbyul Seo(auth.)
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Additional resources for Wireless Communications Resource Management
Thus, a simple way to formulate path loss is to derive the appropriate path-loss exponent a from empirical results. Awidely used practical model is the two-slope path-loss model which employs two different path-loss exponents according to the distance between the transmitter and receiver. To be specific, the channel gain in this model is given by GPL 8 0 1a1 > > d0 > > A@ A ; d 0 d d c ; > > < d 0 1a1 0 1a2 ¼ > > > @ d0 A @ dc A > > A ; d > dc ; > : dc d ð2:15Þ for the reference distance d0 at which the channel gain becomes A.
Choi, Broadband Wireless Access and Local Networks: Mobile WiMAX and WiFi, Artech House, Norwood, MA. ) Wireless Communications Resource Management 20 to characterize and formulate the multipath fading in time and frequency domains is discussed in the following subsections. 1 Fading in the Time Domain Formulating channel fading in the time domain involves finding a mathematical method that describes how the channel h(t; t) changes as the observation time t elapses. In other words, we characterize h(t; t) by fixing the time delay t to a certain value and changing the observation time t.
Therefore, when the carrier frequency or the mobility of the transmitter–receiver pair increases, the channel response estimated by the transmitter–receiver pair becomes invalid sooner and thus a more prompt adaptation is required to the channel variation. The coherence time plays an important role in relation to the delay requirement of the applied traffic. If the coherence time is much shorter than the delay requirement, a transmitting data unit is much more likely to experience several independent channel states.
Wireless Communications Resource Management by Dr Byeong Gi Lee, Daeyoung Park, Hanbyul Seo(auth.)