Communication systems have been playing the major role in information technology, Internet, multimedia communications, forensics, security systems, and handheld applications. Wireless and optical communications have received tremendous interests from both academics and industries over recent years which led to a significant growth of research and development activities in the fields. There are still lots of challenges in the design of an effective communication system or network that can meet all the practical requirements and the growing user demands. This special issue invited research papers from around the world addressing the critical issues in wireless and optical communications along with future directions of the fields. It covers many important areas of communication systems, such as cognitive radio, vehicular ad hoc networks, cooperative cognitive ad hoc networks, quasi-orthogonal space-time block code, signal receive model based on wavelet operator, energy-efficient cellular technologies, and multi-beam mobile satellite system.
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