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Linear precoding for the downlink of multiple input single output coexisting wireless systems

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2 Author(s)
Zhou, J. ; Sch. of Eng. & Electron., Univ. of Edinburgh, Edinburgh ; Thompson, J.

Coexisting radio systems, often called cognitive radio (CR), have attracted much attention because of the lack of spectrum resources and the low usage statistics of existing spectrum allocations. Interference suppression and cancellation are seen as key technologies for enabling coexisting systems, and the application of multiple antennas might be one solution to tackle interference. Linear vector precoding for downlink of multiple input single output CR systems is addressed. The maximum ratio transmission, zero forcing, optimal interference-free, and optimal interference-constrained (IC) precoding algorithms in the sense of minimum mean squared error (MMSE) are presented. Then the authors compare and analyse these algorithms under different channel assumptions. The simulation results show that the proposed IC precoding algorithm can maximise the utilisation of multiple antennas and greatly improve the system performance.

Published in:

Communications, IET  (Volume:2 ,  Issue: 6 )

Date of Publication:

July 2008

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