OFDM Related Technology Research Based On Cognitive Radio

With the rapid development of wireless communication technology, spectrum resources become more and more nervous, How to reuse the spectrum resources has become a hot issue. Dr. Joe Mitola proposed in 1999. Cognitive Radio, this new concept, which combines cognitive science and software radio technology to the air, time and frequency domain and other free resources for effective reasonable perception of detection and re-use. Cognitive Radio technology will become a current wireless communications research and development of new hot spots. The flexible OFDM technology solutions to achieve the selected frequency of cognitive radio systems provide a good platform. NC-OFDM non-continuous wave technology with a flexible frequency selection and power control features that make it pull over other physical layer technology is more suitable for cognitive radio systems. However, OFDM is not only for the synchronization error and channel estimation error is very sensitive, but also with emission signal peak.In this paper, based on the basis of cognitive radio to discuss some technical points OFDM own, and then leads to a modulation for cognitive radio technology --- NC-OFDM. In order to further discuss this NC-OFDM cognitive radio technology and the applicability, the paper then discusses some technical details. As mentioned in Chapter synchronization, phase noise mentioned in Chapter V and Chapter VI Compensation for channel estimation mentioned. These techniques can be applied to NC-OFDM, and further carried out using Matlab simulation software, from the perspective of further experiments to determine these techniques in the applicability of cognitive radio. Thus, cognitive radio will be better and more optimized, in order to adapt to changing wireless environment.