Provided by: International Journal of Engineering Trends and Technology
Date Added: Nov 2015
The wireless medium has limited bandwidth, higher packet error rate and higher packet overheads that altogether limit the capacity of the network to offer guaranteed QoS. Orthogonal Frequency-Division Multiplexing (OFDM) systems also referred as multi-carrier systems are known to be the basis of 3G and 4G technology, for example in LTE (Long Term Evolution) 4G cellular standards, WiMAX standards, 802.11 a/g/n microwave standards, etc. Thus, OFDM is a key wireless broadband technology which supports high data rates. The WiMAX forums network working group is responsible for developing the end-to-end network requirements, architecture and protocols for WiMAX using IEEE 802.16e 2005 as the air interface.