The Optimal Power Allocation In Broadband Cognitive Radio Networks Based On SC-FDMA

With the continuous development of science and technology, the requirement of high-speed wireless networks is increasingly intense. Most people can’t live without a mobile phone, but the phone is also inseparable from the high-speed wireless network. In the Internet age contemporary, high-speed wireless networks has been a hot topic in the new era. At the same time the study of wireless networks is also in full swing.First, this paper introduces OFDM, OFDMA and SC-FDMA techniques and principles and compared the simulation of OFDMA and SC-FDMA PAPR under different scenarios;Second, this paper analyzes the principles and key technologies of cognitive radio technology and demonstrates the similarities point OFDM, OFDMA, SC-FDMA and cognitive radio technologies;Again, this paper studies the problem of optimal power allocation in cognitive radio networks based on OFDM, and compare references algorithm, proposing the power allocation algorithm with lower computational complexity l;Finally, this paper researches the optimal power allocation in broadband cognitive radio networks based on SC-FDMA,studies the convex optimization theory, and proposes the SS-OPA and AA-OPA algorithm. Simulation results show that the algorithm is better than the equal power allocation algorithm and traditional optimal power allocation and is very suitable for the actual communication systems.