5GNOW: Challenging the LTE Design Paradigms of Orthogonality and Synchronicity

Abstract

Abstract-LTE and LTE-Advanced have been optimized to deliver high bandwidth pipes to wireless users. The transport mechanisms have been tailored to maximize single cell performance by enforcing strict synchronism and orthogonality within a single cell and within a single contiguous frequency band. Various emerging trends reveal major shortcomings of those design criteria:• The fraction of machine-type-communications (MTC) is growing fast. Transmissions of this kind are suffering from the bulky procedures necessary to ensure strict synchronism.• Collaborative schemes have been introduced to boost capacity and coverage (CoMP), and wireless networks are becoming more and more heterogeneous following the non-uniform distribution of users. Tremendous efforts must be spent to collect the gains and to manage such systems under the premise of strict synchronism and orthogonality.• The advent of the Digital Agenda and the introduction of carrier aggregation are forcing the transmission systems to deal with fragmented spectrum. 5GNOW (5 th Generation Non-Orthogonal Waveforms for Asynchronous Signalling) is an European collaborative research project supported by the European Commission within FP7 ICT Call 8. 5GNOW will question the design targets of LTE and LTEAdvanced having these shortcomings in mind. The obedience of LTE and LTE-Advanced to strict synchronism and orthogonality will be challenged. It will develop new PHY and MAC layer concepts being better suited to meet the upcoming needs with respect to service variety and heterogeneous transmission setups. A demonstrator will be built as Proof-of-Concept relying upon continuously growing capabilities of silicon based processing. Wireless transmission networks following the outcomes of 5GNOW will be better suited to meet the manifoldness of services, device classes and transmission setups being present in envisioned future scenarios like smart cities. The integration of systems relying heavily on MTC, e.g. sensor networks, into the communication network will be eased. The per-user experience will be more uniform and satisfying. To ensure this 5GNOW will contribute to upcoming 5G standardization.

Theoretical analysis of BER performance of nonlinearly amplified FBMC/OQAM and OFDM signals

“…Filter bank-based multicarrier/offset quadrature amplitude modulation (FBMC/OQAM) modulations are potential promising candidates for next generation systems [1] as well as 5G systems [2]. Indeed, the good frequency localization of the prototype filters [3][4][5] used in FBMC/OQAM offers to this latter the robustness to several impairments such as the timing misalignment between users [6].…”

Review of Key Technologies of 5G Wireless Communication System

“…FMC for the inter-carrier frequency offset is very small due to interference, no CP (Cyclic Prefix), greatly improving the efficiency of the frequency [22]. FBMC attracts more and more people's research interest which is an important choice as a multicarrier scheme to 5G system [23][24][25][26][27]. In FBMC, multi-carrier performance depends on the design of the prototype filter and modulation filter and in order to meet demands of the specific frequency response characteristics, the length of the prototype filter is far greater than the number of subchannels.The implementation complexity is high and not conducive to the realization of hardware.…”

Performance of emerging multi-carrier waveforms for 5G asynchronous communications

“…It has essentially been optimized to provide high data bandwidth to strictly synchronized devices like tablets and smartphones [1]. In the near future, it is expected that the mobile internet will massively be used for machineto-machine communications, introducing the concept of Internet-of-Things (IoT).…”