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,…
Category: WIMAX
Here I write on article How Wimax works and on wimax terminology
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…
Spatial Multiplexing and Receiver Gains in Wimax
Spatial Multiplexing In a multipath environment, the data rate increase due to MIMO is equal to the number of MIMO antennas. Rather than to transmit the same bit of more…
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…
Types of Diversity Space, Time, Spatial, Frequency and Polarization
We know that we normally have several independent paths from TX to Rx of different lengths, these are affected and delayed differently, Signals that start out together at the transmitter…
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…
What are IP Multimedia Subsystem IMS and IMS Structure
IMS means IP Multimedia Subsystem is an essential part of the all-IP UMTS architecture and Relevant for WiMAX for the same usage and also for WiMAX to UMTS Interworking. This…
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 Procedures – Agent Discovery, Registration, Tunneling in Wimax
Mobile IP Procedures Having Three Flow. Agent Discovery Registration Tunneling Agent Discovery Agent Discovery is the method by which a mobile node determines whether it is currently connected to its…
Multicast Forwarding Advantage and disadvantage in Short
Here I write in short Advantages and disadvantages of Multicast Forwarding. Multicast Routing is backwards from Unicast Routing Unicast Routing is concerned about where the packet is going or will…
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…