Looking into the future of the wireless world...[Message from the editor-in-chief]

Dear Readers, Since I took over this magazine as the Editor-in-Chief (EiC), I have been thinking of offering you a special issue on future research directions of wireless developments. As my term is drawing near to its end while a new year starts, I have finally been able to gather a few articles, including a few invited ones, to achieve this. For the invited articles, we offered the invited researchers some flexibility in terms of page limit, and the numbers of equations and references so that they could provide better articulation on important research and design issues. I thank these invited authors for agreeing to contribute to the topic I selected to make this special issue possible.