Scope of 802 standards PHY Layer Features of IEEE 802.16-2004

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Bu sahifa navigatsiya:

• PHY Layer Features of IEEE 802.16-2004(Continued)
• MAC Layer Features of IEEE 802.16-2004

Scope of 802 standards PHY Layer Features of IEEE 802.16-2004 Feature Benefit 256 point FFT OFDM waveform Built in support for addressing multi-path in outdoor LOS and NLOS environments. Adaptive Modulation and variable error correction encoding per RF burst Ensures a robust RF link while maximizing the number of bits/second for each subscriber unit. TDD and FDD support Addresses varying worldwide regulations when one or both may be allowed PHY Layer Features of IEEE 802.16-2004(Continued) Feature Benefit Flexible Channel Sizes (Can be an integer multiple of 1.25 MHz, 1.5 MHz, and 1.75 MHz with a maximum of 20 MHz. Provides the flexibility to operate in many different frequency bands with varying channel requirements around the world. Designed to support smart antenna systems. Smart antennas can suppress interference and increase system gain. They are becoming important to BWA deployment as their costs come down. MAC Layer Features of IEEE 802.16-2004 Feature Benefit TDM/TDMA Scheduled Uplink/Downlink frames. Efficient bandwidth usage Scalable from 1 to hundreds of subscribers Allows cost effective deployments by supporting enough subscribers to deliver a robust business case Connection-oriented • Per Connection QoS • Faster packet routing and forwarding Download 1 Mb.

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