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



Publication Details

T. Liu, A. Alshabo, D. Stirling, L. Tran, M. Ros, P. Premaratne, P. James. Vial, B. Wysocki & T. Wysocki, "On the effects of spreading sequence pairs over MIMO-STS systems," International Journal of Radio Frequency Identification Technology and Applications, vol. 5, (1) pp. 24-47, 2018.


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 x 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.

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