2013/07/03 – updated

5GNOW @Future Network & Mobile Summit 2013
CEA presented its reconfigurable FPGA/ARM digital baseband platform implementing fragmented spectrum
The advent of the Digital Agenda and the introduction of carrier aggregation are forcing the transmission systems to deal with fragmented spectrum. 3GPP/LTE-A is already dealing with some spectrum agility as a requisite to allow worldwide interoperability of devices in a fragmented spectrum. In this context, one scenario under consideration is UL asynchronous multi-user access on fragmented spectrum for 5G with non-orthogonal waveform. The objective is to allow relaxing both time/frequency synchronization constraints while enabling flexible fine-grained sharing of fragmented spectrum. If the spectral needs are not met in a contiguous space of spectrum, then some form of aggregation should be realized. The specific nature of the fragmented spectrum and the stringent requirements on adjacent band leakage are suggesting a new approach for the PHY layer using filter bank modulation (FBMC) and spectrum pooling techniques.

During FuNEMS 2013, CEA presented its reconfigurable FPGA/ARM digital baseband platform implementing fragmented spectrum processing both at transmit and receive parts using FBMC modulation. This real time HW platform aims at demonstrating the FBMC built-in filtering feature adapted to spectrum availability in the fragmented case. An important result is that the complexity of FBMC implementation is contained and may be demonstrated on a single FPGA (small form factor of 160 * 78 * 43 mm). Next step is to demonstrate FBMC multiuser access (FBMC-MA) in a multiuser asynchronous environment.

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