Spectrally Efficient Frequency Division Multiplexing for 5G

The focus of this chapter is on novel multi-carrier communication techniques, which share the common goal of increasing spectrum efficiency in future communication systems. In particular, a technology termed Spectrally Efficient Frequency Division Multiplexing (SEFDM) is described in detail outlining its benefits, challenges and trade-offs when compared to the current state-of-the-art. A decade of research has been devoted to examining SEFDM from different angles; mathematical modelling, algorithm optimisation, hardware implementation and system experimentation. The aim of this chapter is to therefore give a taste of this technology and in doing so, the chapter is organised as follows; first, it is explained how SEFDM fits within the remit of future 5th Generation (5G) communication systems; second, the design principles and implementation trade-offs associated with SEFDM systems are described; third, a number of linear and more sophisticated polynomial detection schemes are compared in terms of performance and complexity; finally, the chapter concludes by outlining a number of experimental testbeds which have been developed for the purpose of evaluating the performance of SEFDM in practical scenarios.

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