Transparent spectral confinement approach for 5G

Abstract

This paper proposes a transparent spectral confinement approach for OFDM to enable multiplexing of multiple services with diverse requirements in one system band. Besides mobile broadband services, new service types like machine type and ultra-reliable low latency communications foreseen for future 5G systems set new requirements for the chosen waveform to support asynchronous access and multiplexing different numerologies. That is not best handled by OFDM as it is. Thus, various spectral confinement techniques have been proposed in the literature, which, however, require specific processing at both the transmitter and receiver. This tight link would increase signaling overheads to agree on both sides to apply certain respective processing. The transparent approach proposed in this paper decouples the tight link and thus keeps the system simple and robust. We show by means of numerical evaluations that OFDM with spectral confinement techniques like windowing or filtering at the transmitter, but without respective receiver processing, outperforms the conventional OFDM.

Flexible Fast-Convolution Processing for Cellular Radio Evolution

“…The spectrum enhancement techniques should also be compatible with each other, allowing different techniques to be used in the TX and RX. Transparent enhanced CP-OFDM techniques have been considered in [22]- [24].…”

“…According to [25, Table 5.3.3-1], the minimum guard bands for base station channel bandwidths are determined as GB = 1 2 BW − SCS ( act,max + 1) , (22) where act,max = 12 × PRB,max with PRB,max being the transmission bandwidth configuration. For example, in 10 MHz channel with 15 kHz SCS, the maximum number of active PRBs is PRB,max = 52 ( act,max = 624) and the resulting guard band is GB = 312.5 kHz.…”

Interference Analysis and Power Allocation in the Presence of Mixed Numerologies

“…In [25], the authors develop a generic and universal optimization-based framework for fastconvolution-based f-OFDM (FC-f-OFDM) waveform processing for the 5G physical layer and evaluate its performance in scenarios following the test cases defined by 3GPP. In [26], a transparent spectral confinement approach is proposed for f-OFDM/W-OFDM to enable multiplexing of multiple services with diverse requirements in one system band. In [27], the authors report a field trial conducted on a configurable testbed in a real-world environment for the performance evaluations of OFDM-based 5G waveform candidates, such as CP-OFDM, W-OFDM, and f-OFDM, and the field trial results confirm the feasibility of multi-numerology systems.…”