On Cognitive Radio Multiband UWB: Spectrum

In wireless communications, spectrum is a valuable natural resource. The traditional way of spectrum allocation is a fixed approach by government agencies or organizations authorized to use. As rapid development in the communications industry, the shortage of wireless spectrum resource-poor is becoming increasingly serious.Multiband Ultra-Wideband systems are able to achieve high data rates and, inevitably, colliding with many existing wireless services because they deal with an excessive wide range of spectrum. Multiband UWB uses orthogonal frequency division modulation (OFDM) to allocate or shape its transmitting spectrum as cognitive radios do.In this paper, the solutions for avoiding interferences in UWB systems are proposed. And a convenient way of detecting interfering signals is also introduced. Then we introduced a new approach of AIC Sub-carrier Channels with improved accuracy of algorithm. Finally, we designed hardware circuits for Multiband UWB systems. After verification, our solutions for dynamically shaping of computing transferring spectrum can be quickly and correctly completed with higher accuracy.