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With high-tech in the signal processing and communication technology wireless sensor network have born as promising tool to apply in daily life. The main issue in wireless sensor network are bit error rate, fixed bandwidth, fading that occur in the wireless channel, and effect of noise, but the biggest challenge is energy consumption because a sensor node is operated with fixed battery and many time these batteries are non rechargeable.it has been shown that using MIMO(Multiple Input Multiple Output) many problem related to wireless channel can be solved easily and efficiently but...

As the demand for sophisticated wireless mobile applications incorporating efficient modulation techniques is ever increasing, the more spectral bandwidth is needed so that more number of applications could work. However, bandwidth is scarce in nature. Also, as the existing spectrum allocation policies of the Federal Communications Commission (FCC) allow spectrum access to licensed users only, it has been proven by various spectrum measurement campaigns that, the current licensed system uses its total spectrum inefficiently.Spectrum pooling is the concept which is based on dynamic spectrum...