The authors have retracted this article [1] because it has been previously published [2]. All authors agree to this retraction.

[1] Lindgren, P., Valter, P. & Prasad, R. Wireless Pers Commun (2019). https://doi.org/10.1007/s11277-019-06260-x

[2] Valter, P., Lindgren, P. & Prasad, R. Wireless Pers Commun (2018) 100: 97. https://doi.org/10.1007/s11277-018-5612-x