ABSTRACT
CONTENTS 5.1 Introduction ................................................................................................. 78
5.1.1 Fixed and Mobile ............................................................................ 78 5.1.2 Frequency ........................................................................................ 79
5.2 Propagation Environment ......................................................................... 81 5.2.1 Propagation Modeling ................................................................... 81 5.2.2 Fixed Broadband Access ................................................................ 83 5.2.3 Link Budgets ................................................................................... 84 5.2.4 Propagation Characteristics .......................................................... 84 5.2.5 In-Building Penetration ................................................................. 87
5.3 System Performance ................................................................................... 90 5.3.1 Data Rates ........................................................................................ 90 5.3.2 Experimental Data .......................................................................... 92 5.3.3 Other Trial Considerations ............................................................ 92 5.3.4 Radio Parameters Analysis and Modeling ................................. 93 5.3.5 Throughput Measurements .......................................................... 97
5.4 Conclusion ................................................................................................... 99 References ........................................................................................................... 100
Modern wireless communication systems deliver reliable high-speed data services. Consumer expectations have become very high: cheaper rates, higher data throughput, flexible applications, better service integration, and almost ubiquitous availability are expected from wireless service providers. Radio technologies and standards have been successful in delivering many of these expectations: CDMA-based third-generation systems such as EVDO (IS-858) and HSDPA provide affordable multimegabit services, and are available in major cities. IEEE standard 802.16 and the WiMAX Forum are pursuing similar goals and present another high-speed access alternative. WiMAX offers both fixed and mobile systems, efficient and adaptive
and
coding and modulation techniques, scalable channel sizes, subchannelization schemes, MIMO antenna systems, quality of service (QoS), and more.
