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In this paper, we present a novel multi-user detection (MUD) technique based on ant colony optimization (ACO), for synchronous direct sequence code division multiple access (DS-CDMA) systems. ACO algorithms are based on the cooperative foraging strategy of real ants. While an optimal MUD design using an exhaustive search method is prohibitively complex, we show that the ACO based MUD converges to the optimal BER performance in relatively few iterations providing 95% saving in computational complexity.

The authors present a moltiiarrier platform that is capable of achieving high spectral efficiency by the application of narrow orthogonal carriers, and which enables flexible spectral sharing across different licensed and unlicensed bands via operator borrowing/lending. ABSTRACTIn this article we propose a new multicarrier platform to optimize the efficiency of wireless operators' licensed hands and enable flexible sharing of licensed and unlicensed hands (in different spectral regions). This research, besides introducing a high degree of flexibility of spectrum use for 4G systems, supports a recent FCC proposal that goes beyond suggesting improved spectral efficiency, and instead suggests innovative spectrum management regulations. Specifically, this work presents a multicarrier platform capable of achieving high spectral efficiency by the application of narrow orthogonal carriers, that enables flexible spectral sharing across different licensed and unlicensed bands via operator borrowingilending.

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