[1] McGill Univ, Montreal, PQ H3A 2T5, Canada
[2] Univ Akron, Dept Elect & Comp Engn, Akron, OH 44325 USA
[3] Queens Univ Belfast, Belfast BT7 1NN, Antrim, North Ireland
[4] McGill Univ, Dept Elect & Comp Engn, Montreal, PQ H3A 2T5, Canada
[5] Queen Mary Univ London, Sch Elect Engn & Comp Sci, London, England
[6] Tennessee State Univ, Nashville, TN USA