5GNOW: Alcatel-Lucent Bell Labs Germany Concepts and Results Contribution for Future Network and Mobile Summit 2013

  • Chen Y.
  • Schaich F.
  • Ten Brink S.
  • Wild T.

The 5GNOW approach is able to efficiently support different traffic types, which all have to be part of future wireless cellular systems. Our vision of a unified frame structure concept aims at handling the large set of requirements within a single 5G system. A filtered multicarrier approach will enable the mix of synchronous / asynchronous and orthogonal / non-orthogonal traffic types, where the reduced side-lobe levels of the waveform seek to minimize inter-carrier interference (ICI). The classical “bit pipe” traffic (type I) with high volume data transmission and high-end spectral efficiency still exploits orthogonality and synchronicity, wherever it is possible, e.g. when serving cell-center users. Vertical layering at common time-frequency resources generates a non-orthogonal signal format supporting heterogeneous cell structures and cell edge transmissions more efficiently. For high-volume data applications in those cell areas (type II), a multi-cell, multi-user transceiver concept is required. The principle of interleave division multiple access (IDMA) is a very appealing approach for generating these signal layers and an elegant receiver and coding concept for it. Machine-type communication (MTC) is expected to be one dominant application of 5G systems. For this sporadic traffic type (type III), a contention based-access technique is attractive, saving overhead by dropping the strict synchronicity requirement. For sensor-type traffic (type IV), the open weightless standard has shown that, from an energy-efficiency perspective, it is beneficial to stretch the transmissions in time by spreading. This additional signal layer, again, can be handled by an IDMA-like approach. One important reference scenario for 5GNOW is the multi-user uplink coordinated multi-point (CoMP) joint reception case where we face timing and carrier frequency offsets. With a novel block-wise filtering multi-carrier approach, which we denote as universal filtered multi-carrier (UFMC), we have shown significant gains of SER over Eb/N0 for SNR operation points of 15 dB and higher

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