Title: On the effects of spreading sequence pairs over MIMO-STS systems

Authors: Tianle Liu; Ahmed Alshabo; David Stirling; Le Chung Tran; Montserrat Ros; Prashan Premaratne; Peter James Vial; Beata Wysocki; Tad Wysocki

Addresses: School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia ' School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia ' School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia ' School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia ' School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia ' School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia ' School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia ' School of Electrical & Computer Engineering, University of Nebraska - Lincoln, Lincoln, NE, USA; CEEN Department, Peter Kiewit Institute, 1110 South 67 St. Omaha, NE 68182-0572, USA ' School of Electrical & Computer Engineering, University of Nebraska - Lincoln, Lincoln, NE, USA; CEEN Department, Peter Kiewit Institute, 1110 South 67 St. Omaha, NE 68182-0572, USA

Abstract: Previous studies have found that the Multiple Access Interference (MAI) effect is strongly associated with which sequence pairs are spread over Multiple-Input Multiple-Output Space-Time Spreading (MIMO-STS) systems. An improved method of determining which sequence pairs are to be spread is proposed. The choice of these pairs from the selected spreading code families results in a number of ways to mitigate the MAI effects. A Software Defined Radio (SDR) test bed system has been developed to evaluate the selected spreading sequences, in an attempt to mitigate the MAI effects over 2 × 1 MIMO-STS systems. The SDR test bed results reveal that, for a number of the spreading sequence families, improved transmission properties for asynchronous transmission can be achieved.

Keywords: MIMO; MAI; spreading sequences; pairs; SDR test bed.

DOI: 10.1504/IJRFITA.2018.091305

International Journal of Radio Frequency Identification Technology and Applications, 2018 Vol.5 No.1, pp.24 - 47

Received: 30 Dec 2014
Accepted: 21 Oct 2015
Published online: 24 Apr 2018 *

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