In 21st Century, Wireless communications have a robust effect on enlightening the quality of life. Smart phones industry is now well thought-out one of the most gorgeous fields, so advanced research is conducted in order to improve the quality of service in wireless communication environments. Wireless communication is among technologys biggest contributions to mankind. Wireless communication involves the transmission of information over a distance without help of wires, cables or any other forms of electrical conductors. The transmitted distance can be anywhere between a few meters such as a televisions remote control and thousands of kilometres such as radio communication. Some of the devices used for wireless communication are cordless telephones, mobiles, GPS units, wireless computer parts, and satellite television. The growth of wireless network has enabled us to use personal devices anywhere and anytime. This has helped mankind to improve in every field of life but this has led many threats as well. Wireless network has led to many security threats to mankind. It is very easy for the hackers to grab the wireless signals that are spread in the air. It is very important to secure the wireless network so that the information cannot be exploited by the unauthorized users. This also increases the risk to lose information. Strong security protocols must be created to secure the wireless signals like WPA and WPA2. Another way to secure the wireless network is to have wireless intrusion prevention system. Many design challenges such as power consumption, quality of service, low cost, high data rate and small size are being preserved day by day. This book entitled Contemporary Issues in Wireless Communications provide highlights of the contemporary research in the field of wireless communications.