Akademik Veri Yönetim Sistemi
International Conference on Advances in Computational Tools for Engineering Applications, Beirut, Lübnan, 15 - 17 Temmuz 2009, ss.529-530
IEEE is developing a wireless communication standard that will take place in cognitive radio class and be valid in the world. Data communication capability supporting is aimed with this standard called IEEE 802.22 to the rural area users in TV bands. In the TV bands, not to cause harmful interference to the existing TV receivers and to communicate in unused channels, effective detection of unused channels is needed. This is succeeded with effective spectrum sensing. Sensing the presence of TV signals in the channel being tracked is more possible with using effective spectrum sensing techniques. In this paper, it is demonstrated with detailed simulations that a base station and users in an IEEE 802.22 cell sense TV signals better with setting up cooperation and it is reached to the better performance results by adding time diversity to this cooperation. Besides, it is also presented in this paper that effective cooperation is done with decrease of cost, power consumption and complexity by choosing relays who have higher SNR threshold.