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Articles 1 - 4 of 4
Full-Text Articles in Physical Sciences and Mathematics
Space Time Spreading With Modified Walsh-Hadamard Sequences, Peter James Vial, Beata J. Wysocki, I. Raad, Tadeusz A. Wysocki
Space Time Spreading With Modified Walsh-Hadamard Sequences, Peter James Vial, Beata J. Wysocki, I. Raad, Tadeusz A. Wysocki
Faculty of Informatics - Papers (Archive)
Previous work has shown that the performance of a space time spreading (STS) system using Walsh codes with two transmit antennas at the base station (BS) is degraded in the presence of mutual interference from adjacent sectors in the same cell. We use modified Walsh-Hadamard sequences exhibiting improved cross-correlation performance, which potentially mitigates the effects of MAI (multiple access interference). The presented study also looks at variation of sets of different modified Walsh-Hadamard codes being used by the adjacent interferer, with a hundred randomly selected pairings being chosen, as well as the case where one set of alternate codes is …
The Effect Of Imperfect Carrier Recovery On The Performance Of The Diversity Antenna Selection Technique In Wireless Channels Utilizing Dstm, Le Chung Tran, Tadeusz A. Wysocki, Alfred Mertins
The Effect Of Imperfect Carrier Recovery On The Performance Of The Diversity Antenna Selection Technique In Wireless Channels Utilizing Dstm, Le Chung Tran, Tadeusz A. Wysocki, Alfred Mertins
Faculty of Informatics - Papers (Archive)
This paper examines the effect of imperfect carrier phase/frequency recovery at the receiver on the bit error performance of our diversity antenna selection technique (AST) proposed for channels utilizing differential space-time modulation (DSTM). The tolerance of differential detection associated with the proposed AST to phase/frequency errors is then analyzed.
Multi-Modulation Schemes To Increase The Rate Space-Time Block Codes In Rayleigh Fading Channels, Le Chung Tran, Tadeusz A. Wysocki, Alfred Mertins
Multi-Modulation Schemes To Increase The Rate Space-Time Block Codes In Rayleigh Fading Channels, Le Chung Tran, Tadeusz A. Wysocki, Alfred Mertins
Faculty of Informatics - Papers (Archive)
The paper examines multimodulation schemes (MMSs) to increase the rate of our two new complex orthogonal designs (CODs) proposed for eight transmit antennas, namely C/sub 1/ and C/sub 2/, corresponding to the Amicable Orthogonal Designs (AODs) (8;1,1,2,2;1,1,2,2) and (8;1,1,1,4;1,1,1,4), respectively. In addition, the optimal intersymbol power allocation in the proposed codes in single modulation as well as in MMSs in flat Rayleigh fading channels is considered. It turns out that, in some modulation schemes, equal power transmission per each symbol time slot is not only optimal from the technical point of view, but also optimal in terms of achieving the …
Two Complex Orthogonal Space-Time Codes For Eight Transmit Antennas, Le Chung Tran, Jennifer Seberry, Yejing Wang, Beata J. Wysocki, Tadeusz A. Wysocki, Tianbing Xia, Ying Zhao
Two Complex Orthogonal Space-Time Codes For Eight Transmit Antennas, Le Chung Tran, Jennifer Seberry, Yejing Wang, Beata J. Wysocki, Tadeusz A. Wysocki, Tianbing Xia, Ying Zhao
Faculty of Informatics - Papers (Archive)
Two new constructions of complex orthogonal space-time block codes of order 8 based on the theory of amicable orthogonal designs are presented and their performance compared with that of the standard code of order 8. These new codes are suitable for multi-modulation schemes where the performance can be sacrificed for a higher throughput.