W. Park, H. J. Yang*, and H. M. Oh, “Sum-rates of asynchronous GFDMA and SC-FDMA for 5G uplink,” ICT Express, vol. 1, no. 3, pp.127-131, Dec. 2015
The fifth generation (5G) mobile envisions ultra-low latency less than 1ms for end-to-end communications. To this end, frameless asynchronous multiple-access may be needed to allow users to transmit instantly without waiting for the next frame start. In this paper, generalized frequency division multiple-access (GFDMA), one of the promising multiple-access candidates for the 5G mobile, is compared with the conventional single-carrier FDMA (SC-FDMA) in terms of the uplink sum-rate when both techniques are adapted for the asynchronous scenario. In particular, a waveform windowing technique is applied to both the schemes to mitigate the inter-user interference due to non-zero out-of-band emission.