First-Generation Broadband Systems

As DSL and cable modems began to be deployed, wireless systems had to evolve to support much higher speeds to be competitive. Systems began to be developed for higher frequencies,…

Evolution of Broadband Wireless

The history of broadband wireless as it relates to WiMAX can be traced back to the desire to find a competitive alternative to traditional wireline-access technologies. Spurred by the deregulation…

Receive Diversity Selection and Switched Diversity

Make use of a number of receive antennas that are well separated (coherence distance) to generate independent receptions of the transmitted signal. Selection diversity: choose received signal with largest received…

RADIUS Protocol Stack in Wimax

RADIUS is a protocol that enables a single server to become responsible for all remote access authentication, authorization, and auditing (or accounting) services. RADIUS functions as a client/server system. The…

IP Multicast Service Models – Dense and Sparse Modes

IP Multicast Service Models Having Three Multicast Any-Source Multicast (ASM) Source-Filtered Multicast (SFM) and Source-Specific Multicast (SSM) which work as below. Any-Source Multicast (ASM) Destination ‘multicast’ address only defines ‘Group’…

Multicast Advantages and Disadvantages

When sending the same data to multiple receivers, rather than send multiple copies all the way from sender to all the receivers, just send one copy and duplicate where paths…

Mobile IP and Mobile IP Terminology

If a mobile device moves to a new network and keeps the same IP address, the address will not reflect its new location therefore routers will be unable to route…