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OFDM modulation v72
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In a basic communication system, the data are modulated onto a single carrier frequency. The available bandwith is then totally occupied by each symbol. This kind of system can lead to inter-symbol-interference (ISI) in case of frequency selective channel.The basic idea of OFDM is to divide the available spectrum into several orthogonal subchannels so that each narrowband subchannel experiences almost flat fading. With OFDM, it is possible to have overlapping subchannels in the frequency domain, thus increasing the transmission rate. OFDM systems have gained an increased interest during the last years. It is used in the European digital broadcast radio system, as well as in wired environment such as asymmetric digital subscriberlines (ADSL). This technique is used in digital subscriber lines (xDSL) to provides high bitrate over a twisted-pair of wires. The project focuses on the latter application.
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2016-08-23
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