Experimental implementation of real-time non-orthogonal multi-carrier systems in a realistic fading channel

Abstract

Spectrally efficient frequency division multiplexing (SEFDM) has the potential to improve spectrum utilisation through bandwidth compression at the cost of self-induced intercarrier interference. In this paper, an experimental test-bed is designed and implemented to evaluate the performance of SEFDM systems in real-time using frequency-domain channel estimation/equalisation and iterative signal detection. Our innovation lies in the development and experimental, real-time implementation of baseband generation, signal assembly, signal decoding and a novel frequency-domain channel estimation and equalisation method for the SEFDM transceiver. Our system compresses the transmitted signal bandwidth up to 60%, 30% and 20% for BPSK, QPSK and 8PSK respectively, offering significant bandwidth savings, and moving towards satisfying one of the key 5G challenges.

The First 15 Years of SEFDM: A Brief Survey

“…2016 [44] 60 GHz millimeter wave signal transmission at 3.75 Gbit/s Jul. 2016 [95] 2.4 Gbit/s WDM visible light communication (VLC) experiment Sep. 2016 [64] VLC experiment using RLS time-domain channel estimation May 2017 [23] Transmission experiment for carrier aggregation in a wireless channel Oct. 2017 [96] Over-the-Air testing using software defined radio USRP RIO devices Jan. 2018 [97] Experimental implementations of real-time systems in fading channel Jun. 2018 [98] Pipelined iterative detection experiment Jun.…”

Security Analysis of IoT Networks and Platforms

“…Spectral Efficiency Frequency Division Multiple (SEFDM) is a new bandwidth compression technology explored for efficient use of wireless spectrum in meeting the connectivity vision of the Internet of Things in 5G and 6G era. In [38], a novel SEDM study achieved a 60% compression of signal bandwidth, but with significant inter-carrier interference and multi-path effects.…”

Experimental SEFDM Pipelined Iterative Detection Architecture with Improved Throughput

“…In this work, the pilot is sent as an OFDM symbol, but at a lower rate in comparison to SEFDM symbols [19]. Hence, we design our OFDM pilot such that the subcarrier frequencies are equivalent to those of the SEFDM subcarriers, but without the inter-carrier interference, since these pilots are orthogonal.…”