By Frank Ohrtman
ISBN-10: 0071454012
ISBN-13: 9780071454018
ISBN-10: 0071589031
ISBN-13: 9780071589031
Wi-MAX is a huge deal simply because it’s more cost-effective, smaller, easier and more uncomplicated to exploit than any current broadband alternative (DSL, cable, fiber, 3G instant) – it additionally bypasses the present stressed infrastructure and legacy provider companies (i.e. the telephone and cable companies). This booklet offers a easy technical advent to the IEEE usual, permitting engineers, technologists, and decision-makers to envision how this highly disruptive expertise goes to impact their companies.
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Extra resources for WiMAX Handbook
Sample text
Service flows are the mechanism for UL and DL for QoS management. In particular, they facilitate the bandwidth allocation process. An SS requests UL bandwidth on a per connection basis (implicitly identifying the service flow). 1 The modulation and coding schemes are specified in a burst profile that may be adjusted adaptively for each burst to each SS. 16-2004 IEEE Standard for Local and Metropolitan Area Networks, Part 16, Air Interface for Fixed Broadband Wireless Access Systems,” June 24, 2004, 31.
If telecommunications consumers are to enjoy the benefits of competition in their local loop, a form of bypass of the switching architecture and the means of access (copper wires from the telephone company) must be offered. This page intentionally left blank CHAPTER 2 WiMAX: The Physical Layer (PHY) Copyright © 2005 by The McGraw-Hill Companies, Inc. Click here for terms of use. 999 percent reliability. 16 Working Group D) relied on proven technologies for the PHY including orthogonal frequency division multiplexing (OFDM), time division duplex (TDD), frequency division duplex (FDD), Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation (QAM), to name only a few.
The same modulation levels are also supported. STC and AAS with SDMA are supported, as is multiple input, multiple output (MIMO). MIMO encompasses a number of techniques for utilizing multiple antennas at the BS and SS in order to increase the capacity and range of the channel. Chapter 2 22 The frame structure in the OFDMA PHY is similar to the structure of the OFDM PHY. The notable exceptions are that subchannelization is defined in the DL as well as in the UL, so broadcast messages are sometimes transmitted at the same time (on different subchannels) as data.
WiMAX Handbook by Frank Ohrtman
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