Effectiveness of Tone-Reservation using Null Subcarriers (TR-NS) in WiMAX Systems
In this paper, we propose a modified tone reservation method to reduce peak-to-average power ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) system by using null subcarriers (TR-NS), and evaluate its performance under physical layer model of IEEE standard 802.16d-2004, I.e., WiMAX systems. We first verified that the spectrum of transmitted OFDM signals processed by TR-NS method with a small number of null subcarriers do notviolate the spectrum mask specified in ETSI standard. Furthermore, we explored that the gain from TR-NS method increase slightly with the number of null subcarriers, but the TR-NS method is efficient in certain extent in terms of both complementary cumulative probability function and total degradation. Additionally we found that an “efficient PAPR definitively exist for the proposed TR-NS method, where a lower predefined PAPR threshold can not promise a better peak-power reduction gain. It is worthy noting that this result differs from that of TR using arbitrary reserved tones in the literature. Finally, we compared proposed TR-NS method with clipping-like methods in terms of total degradation to show the effectiveness of the TR-NS method by simulation, in which nonlinearity distortion due to high-power amplifiers is introduced.
Gang Wu Su Hu Shao-Qian Li Yong Liang Guan Choi Look Law
National Key Lab of Communication University of Electronic Science and Technology of China Chengdu, Positioning and Wireless Technology Centre Nanyang Technological University 50 Nanyang Drive, Singap
国际会议
2007年通信、电路与系统国际会议(2007 International Conference on Communications,Circuits and Systems Proceedings)
日本福冈
英文
2007-07-11（万方平台首次上网日期，不代表论文的发表时间）