Resource Allocation Algorithms with PAPR Reduction Capability for OFDMA Systems

• Main Authors: Yi-shiung Tsai, 蔡憶萱
• Other Authors: Ching-Yung Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/52156580589227420730

碩士 === 國立高雄第一科技大學 === 電腦與通訊工程研究所 === 100 === In orthogonal frequency division multiple access (OFDMA) systems, the system performance is significantly affected by the strategy of subcarrier and power allocations. Recently, several optimal resource allocation strategies have been presented with focuses on maximizing the system capacity, maximizing the fairness or minimizing the transmission power. However, the high peak-to-average power ratio (PAPR) issue of multicarrier technique is rarely considered in those strategies which may result in bit error rate (BER) performance degradation due to nonlinear distortion of practical power amplifiers. In this research, the tone reservation (TR) mechanism is smoothly combined with resource allocation strategies to effectively reduce the PAPR. To satisfy various design requirements, with the fairness taken into account, two kinds of constrained optimization criteria have been proposed along with the associated suboptimal low-complexity algorithms for resource allocation in OFDMA systems. The first criterion maximizes the system capacity subject to a constraint on the value of PAPR, and the other one minimizes the value of PAPR subject to a low bound of the system capacity. The efficacy of the proposed criteria and the corresponding algorithms is verified by computer simulations. According to the simulation results, the proposed approaches achieve lower PAPR as well as lower BER, while keeping desired system capacity and fairness, in comparison with a conventional method. The results of this thesis can be used for resource allocation in transmitter of an OFDMA system.