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The radio frequency is a limited natural resource and getting enabled day by day due to growing demand of the wireless communication applications. To operate on a specific frequency band, license are needed. The use of radio spectrum in each country is governed by the corresponding government agencies. In conventional technique each user is assigned a license to operate in a certain frequency band. Most of the time spectrum remains unused. The allocated spectrum is not utilized properly; it varies with time, frequency and geographical locations. Thus to overcome the spectrum scarcity and...

With the growth of mobile computing it has become extremely important to maintain continuous connectivity when a mobile host moves from one location to another. Thus call handoff has become an important factor. In this book, call handoff strategies are discussed. Few fuzzy logic based call handoff techniques are discussed which are proposed by the author. A variable hysteresis margin based call handoff scheme is also proposed in the work. The handoff techniques avoid both call termination and unnecessary handoff for high and low velocity mobiles respectively and thus efficiently utilizes...

Multirate techniques are commonly used in audio and video processing, communications systems, and transform analysis. In most applications multirate systems are used to improve the performance, or for increased computational efficiency. OFDM is a very attractive technique for wireless communication due to its spectrum efficiency and channel robustness. The major drawbacks of OFDM system are high peak-to-average power ratio (PAPR) and inter-carrier interference (ICI). In this book, several important aspects are described as well as a mathematical analysis is provided, including the...