Adjustable dynamic range for paper reduction schemes in large-scale MIMO-OFDM systems

Udomsripaiboon, Thana (2017) Adjustable dynamic range for paper reduction schemes in large-scale MIMO-OFDM systems. [Thesis (PhD/Research)]

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Abstract

In a multi-input-multi-output (MIMO) communication system there is a necessity to limit the power that the output antenna amplifiers can deliver. Their signal is a
combination of many independent channels, so the demanded amplitude can peak to many times the average value. The orthogonal frequency division multiplexing
(OFDM) system causes high peak signals to occur because many subcarrier components are added by an inverse discrete Fourier transformation process at the base station. This causes out-of-band spectral regrowth. If simple clipping of the input signal is used, there will be in-band distortions in the transmitted signals and the bit error rate will increase substantially.

This work presents a novel technique that reduces the peak-to-average power ratio (PAPR). It is a combination of two main stages, a variable clipping level and an
Adaptive Optimizer that takes advantage of the channel state information sent from all users in the cell.

Simulation results show that the proposed method achieves a better overall system performance than that of conventional peak reduction systems in terms of the symbol
error rate. As a result, the linear output of the power amplifiers can be minimized with a great saving in cost.


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Item Type: Thesis (PhD/Research)
Item Status: Live Archive
Additional Information: Doctor of philosophy (PhD) thesis.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Supervisors: Billingsley, John; Maxwell, Andrew
Date Deposited: 31 May 2018 05:18
Last Modified: 31 May 2018 05:18
Uncontrolled Keywords: multi-input-multi-output communication system; orthogonal frequency division multiplexing system
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing
10 Technology > 1005 Communications Technologies > 100501 Antennas and Propagation
09 Engineering > 0906 Electrical and Electronic Engineering > 090604 Microelectronics and Integrated Circuits
URI: http://eprints.usq.edu.au/id/eprint/34212

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