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Ofdm a prominent technology in modern wireless communication

Author: 
Mrs. Samata R. Bhosale
Subject Area: 
Physical Sciences and Engineering
Abstract: 

Orthogonal Frequency division Multiplexing is a prominent technology in modern wireless communication and is the key technology employed in 4G wireless communication. OFDM is a popular method for high data rate (Gordon et al., 2004). The orthogonal Frequency Division Multiplexing has a very large bandwidth of about 20 Mega Hz where as a GSM system has a bandwidth of 200KHz because of the large bandwidth the data rate in OFDM is very high about 500Mb/sec or 1Gb/sec. OFDM has gain importance in modern wireless communication because of its ability to overcome Inter symbol Interference (ISI). OFDM is employed in 4G cellular standards such as LTE (Long Term Evolution) is a 4G cellular standard, Wi-Max (World-wide interoperability for microwave access) (Mohamed et al., 2012). Several Wi-Fi standards such as 802.11a, 802.11g, 802.11n and 802.11ac which enable high data rate are also based on OFDM (Mohamed et al., 2012). In broadband communication the problem of inter symbol interference occurs because the symbol time is very less than the delay spread of the channel. Interference means degradation or loss of information. This paper gives a overview of how inter symbol interference can be avoided in broadband wireless communication using OFDM technology.

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