By Mustafa Ergen
ISBN-10: 0387681892
ISBN-13: 9780387681894
This booklet addresses the rising know-how for Orthogonal Frequency department a number of entry (OFDMA), protecting OFDMA actual layer in addition to community know-how. The booklet additionally contains info on IEEE 802.16e and WiMAX networks and in addition bargains a comparability with different OFDMA technologies.
OFDMA is the quickest transforming into region within the instant industry, and the spine of platforms utilized in WiMAX. WiMAX is the know-how that permits instant clients to speak at any time from any position with no need to discover a WiFi hotspot.
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Extra resources for Mobile Broadband - Including WiMAX and LTE
Example text
We analyze the statistical properties of the time-varying fading channels with the Bello functions, which was worked out by Bello in 1963. The first function (h(τ ,t)), as illustrated in Fig. 19, is the time-variant impulse response or input delay spread function. h(τ ,t) arises from the pulse train concept as illustrated in Fig. 20. A single pulse creates several rays where each ray either corresponds to LOS or multipath component. However, it is time-varying meaning that with time amplitude (αi ), phase φi , and delay (τi ) of the ray changes.
6 as well as in Part 3 of the book. 2 Spectral Efficiency Designing a cellular network trades off several competing requirements: capacity, service definition and quality, capital expenditures (CAPEX) and operational expenditures (OPEX), resource requirements including spectrum, end-user pricing/affordability, coexistence with other radio technologies. Lately, new developments such as femtocells and multiantenna system redefine this trade-off. A metric called spectral efficiency is defined to quantify the efficiency of the cellular network.
21) where Lo is given as We skip the details of Lrts and Lmsd but briefly introduce them as follows; Lrts requires the width of the street as well as the difference between the building height and height of the mobile station. There is also correction factor which takes the street orientation in perspective. Lmsd requires the difference between height of the base station and roof top level. COST-231 W-I is accepted to ITU-R (Report 567-4); however, the model does not give good performance if antenna heights are less than the rooftop level.
Mobile Broadband - Including WiMAX and LTE by Mustafa Ergen
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