University of Twente Student Theses


Inter-Symbol Interference Prevention techniques for Noise-based Frequency Offset Transmit-reference Systems

Hartman, T.H.F. (2016) Inter-Symbol Interference Prevention techniques for Noise-based Frequency Offset Transmit-reference Systems.

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Abstract:The Telecommunication group, at the University of Twente, is working under the WALNUT project, on developing new ways of communication using noise-based transmit-reference (TR) modulation. TR modulation is a technique where a linear combination of the spreading signal and the spread signal, separated by a small frequency offset, are sent over a channel. By using this technique, no complex receiver scheme has to be implemented, because the spreading signal is also received. The performance of such a communication system will be reduced by the detrimental effect of inter-symbol interference (ISI). ISI is the interference of adjacent symbols caused by the signals arriving at different time lags due to the multipath behaviour of the channel. In this report, ISI and techniques to prevent ISI are studied. After a small literature research of the ISI prevention technique, two techniques were chosen to investigate: root-raised cosine (RRC) filtering and the use of a guard interval. At first, a simple multipath situation is simulated by only considering a 2-path. On this situation the two ISI prevention techniques are applied and it was found that both techniques show promising results. This specific 2-path was then further adapted into a general multipath, where the delay spread of the channel is dependent on which environment that is simulated. The channel in this situation is considered deterministic. On this multipath situation again both techniques were applied and it was found that the guard interval shows an improvement on the performance of the system. The RRC technique however shows no change in performance when compared to the general case without an ISI prevention technique.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:31 mathematics, 53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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