期刊名称：International Journal of Electrical, Electronics and Computer Engineering
电子版ISSN：2277-2626
出版年度：2012
卷号：1
期号：1
页码：4
语种：English
出版社：RESEARCH TREND
摘要：ABSTRACT : The IEEE 802.22 stands for Wireless Regional Area Network (WRAN). WRAN uses the white spaces & unused VHF & UHF TV Bands. Cognitive Radio (CR) is a key to develop such a wireless standard. It is based on Time division multiplexing and Orthogonal Frequency Division Multiple Access. WRAN is developed for rural areas where utilization can be very low. In this paper we provide a detail overview of IEEE 802.22 WRANs & mainly PHY layer. The WRAN physical layer is fundamentally based on the IEEE 802.16e system, but the OFDMA parameters including preamble structure and pilot pattern are newly designed by considering the WRAN channel environments. To evaluate the performance of PHY layer of WRAN, we have done simulation of its end to end model in MATLAB and obtained BER curves for uplink direction for different modulation schemes at different code rate over AWGN channel.
