Analysis of Candidate Waveforms for Integrated Satellite-Terrestrial 5G Systems

Abstract

Satellites will play an indispensable part in 5G roll out and the common use of new radio (NR) air interface will enable this. Satellite-terrestrial integration requires adaptations to the existing NR standards and demands further study on the potential areas of impact. From a physical layer perspective, the candidate waveform has a critical role in addressing design constraints to support non-terrestrial networks (NTN). In this paper, the adaptability of frequency-localized orthogonal frequency division multiplexing (OFDM)-based candidate waveforms and solutions are discussed in the context of physical layer attributes of non-linear satellite channel conditions. The performance of the new air interface waveforms are analysed in terms of spectral confinement, peak-to-average power ratio (PAPR), power amplifier efficiency, robustness against non-linear distortions and carrier frequency offset (CFO).

A Survey on Non-Geostationary Satellite Systems: The Communication Perspective

“…Reference [92] studies and analyzes the random access procedures over NTN-based 5G systems and the challenges imposed by the increased signal propagation delay. The adaptability of candidate waveforms under satellite channel impairments is evaluated in [93]. The impact of the satellite channel characteristics on the physical and medium access control layers in terms of transmitted waveforms is assessed in [7], particularly random access, timing advance, and hybrid automatic repeat request in the context of satellitebased NR networks.…”

Towards an improved understanding of greenhouse gas emissions and fluxes in tropical peatlands of Southeast Asia

“…Hence, power efficient transmission is critical in the regenerative scenario for direct user access, especially in the satellite to user link, where NR air interface should be employed. The OFDM based NR air interface waveforms can generally be represented as [14]…”

“…The f-OFDM signal y(n), is then generated by filtering the CP-OFDM signal through a band-pass filter with impulse response, f (n), to obtain y (n) = s (n) * f (n) where * denotes linear convolution. The choice of transmit/receive window and filter functions, receiver processing and detailed implementation aspects are provided in [6], [8], [14].…”

“…The performance assessment of 5G NR physical layer aspects for geostationary (GEO) satellite scenario is carried out in [13]. The adaptability of candidate waveforms under satellite channel impairments for single numerology scenario is evaluated in [14]. The NR air interface analysis for different user access types with transparent payload satellites was performed in [15].…”

Signal Assisted Clipping Distortion Recovery for OFDM Systems Based on Compressed Sensing

“…Orthogonal frequency division multiplexing(OFDM) technology has been widely used in standards such as longterm evolution(LTE), fifth-generation(5G), wireless local area networks(WLANs) and (Digital Video Broadcasting)DVB, and will also play an important role in the future space and terrestrial integrated network [1]- [5]. OFDM technology has superior performance in combating multipath fading and increasing data transmission rate, but the problem of high peak-to-average power ratio(PAPR) in OFDM system still exists [6]- [9].…”