DSP Software Implementation of Multi-standard Spectrum Sensing for Cognitive Radio

• Main Authors: Min-Jung Fan-Chiang, 范姜敏容
• Other Authors: Sao-Jie Chen
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/86833058623091644905

碩士 === 國立臺灣大學 === 電子工程學研究所 === 98 === In order to fully exploit wireless radio resource and then increase spectrum efficiency, cognitive radios for future wireless communication systems shall sense wireless environments and identify interference so that the secondary system(s) may coexist with primary communication systems. As a result, sensing and cognition play a major functionality in cognitive radios. In this Thesis, we aimed at the spectrum sensing mechanism under several existing or developing communication systems. Compare to previous technique in single system spectrum sensing, multiple systems coexist will be the future trends in communication systems and the difficulty and complexity on multi-standard spectrum sensing is more worthy of further exploration. The spectrum sensing mechanism is able to detect signals belong to which system, when there are more than one primary users. Depending on different system coexistence situations, we choose different techniques to detect the primary users, which include measurement received signal strength indicator (RSSI), cyclic prefix detection, and spectral correlation function (SCF). Since the flexibility of software defined radio is considered suitable to achieve multi-system radio, we develop our spectrum sensing mechanism in software on an existing digital signal processor platform and perform optimization on the program.