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On the Fast DHT Precoding of OFDM Signals over Frequency-Selective Fading Channels for Wireless Applications

Anoh, Kelvin; Tanriover, Cagri; Ribeiro, Moisés V.; Adebisi, Bamidele; See, Chan Hwang


Kelvin Anoh

Cagri Tanriover

Moisés V. Ribeiro

Bamidele Adebisi


Due to high power consumption and other problems, it is unlikely that orthogonal frequency-division multiplexing (OFDM) would be included in the uplink of the future 6G standard. High power consumption in OFDM systems is motivated by the high peak-to-average power ratio (PAPR) introduced by the inverse Fourier transform (IFFT) processing kernel in the time domain. Linear precoding of the symbols in the frequency domain using discrete Hartley transform (DHT) could be used to minimise the PAPR problem, however, at the cost of increased complexity and power consumption. In this study, we minimise the computation complexity of the DHT precoding on OFDM transceiver schemes and the consequent power consumption. We exploit the involutory properties of the processing kernels to process the DHT and IFFT as a single-processing block, thus reducing the system complexity and power consumption. These also enable a novel power-saving receiver design. We compare the results to three other precoding schemes and the standard OFDM scheme as the baseline; while improving the power consumption efficiency of a Class-A power amplifier from 4.16% to 16.56%, the bit error ratio is also enhanced by up to 5 dB when using a 1/2−rate error-correction coding and 7 dB with interleaving.

Journal Article Type Article
Acceptance Date Sep 25, 2022
Online Publication Date Sep 28, 2022
Publication Date 2022-10
Deposit Date Oct 5, 2022
Publicly Available Date Oct 5, 2022
Journal Electronics
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 11
Issue 19
Article Number 3099
Keywords discrete Hartley transform (DHT); discrete Fourier transform (DFT); orthogonal frequency division multiplexing (OFDM); precoding
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