Application of frequency-time coding to multicarrier transmission schemes



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Texas Tech University


Multi-carrier modulation (MCM) techniques are used for high bit rate data transmission in radio transmission systems. The main scope of this work includes understanding a multi-carrier modulation system and setting up a simulation environment for such a system as applied in the case of Asymmetric Digital Subscriber Loop (ADSL) system and Orthogonal Frequency Division Multiplex (OFDM) system.

The concept of spatial diversity as found in Space-time code is explored and a method to apply this diversity concept to a multi-carrier system is investigated. Performance levels for both a pure multi-carrier scheme and the scheme employing multi-carrier modulation with diversity are compared. The results are analyzed, the trade offs are discussed and a conclusion is drawn.

It is found that the Frequency time coded DMT (FTC-DMT) is a good error correcting code but not very efficient in the use of bandwidth and hence is not useful for applications that focus on maximizing data rates.



Data transmission systems, Space time codes -- Computer simulation, Modulation (Electronics) -- Computer simulation, Multichannel communication