Electronics Project:OFDM Simulator
OFDM-based
Wireless Broadband System Simulator:
High
capacity and variable bit rate information transmission with high bandwidth
efficiency are just some of the requirements that the modern transceivers have
to meet in order for a variety of new high quality services to be delivered to
the customers. Because in the wireless environment, signals are usually
impaired by fading and multipath delay spread phenomenon, traditional single
carrier mobile communication systems do not perform well. In such channels,
extreme fading of the signal amplitude occurs and Inter Symbol Interference
(ISI) due to the frequency selectivity of the channel appears at the receiver
side. This leads to a high probability of errors and the system’s overall
performance becomes very poor. Techniques like channel coding and adaptive
equalization have been widely used as a solution to these problems. However,
due to the inherent delay in the coding and equalization process and high cost
of the hardware, it is quite difficult to use these techniques in systems
operating at high bit rates, for example, up to several Mbps. An alternative
solution is to use a multi carrier system. Orthogonal Frequency Division
Multiplexing (OFDM) is an example of it and it is used in several applications
such as asymmetric digital subscriber lines (ADSL), a system that makes high
bit-rates possible over twisted-pair copper wires. It has recently been
standardized and recommended for digital audio broadcasting (DAB) in Europe and
it is already used for terrestrial digital video broadcasting (DVB-T). The IEEE
802.11a standard for wireless local area networks (WLAN) is also based on OFDM.
This
project provides the simulations model of Wireless Broadband System with OFDM
as the modulation and multiplexing technique used in it.
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