The Designs to Simultaneously Reduce the PAPR Values of Multiple Symbols Using Cross-layer Coding and Hierarchical Modulation

• Main Authors: Shao-Chieh Lu, 呂劭傑
• Other Authors: 李世凱
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/72991350273790355193

碩士 === 元智大學 === 通訊工程學系 === 100 === Recently, fountain codes have been attracted much attention. Fountain codes as packet-level codes to reduce PAPR for OFDM systems have been proposed. However, the PAPR can not be achieved as well as the SLM-type scheme when a encoded packet is carried over multiple OFDM symbols. In this thesis, a cross layer design for PAPR reduction by using fountain codes and hierarchical modulation. Due to existing versatile applications in networks, proper resource management which help solve the problem is discovered. We also proposed another cross layer design for PAPR reduction by using a fountain code and a convolutional code. We fragment a convolutional codeword into several segments and apply the PTS concept to reduce PAPR values in the Single/Multi user case. However, the transmission of the side information about the rotations can be avoided through calculating increasing rate of the minimal path metrics in a Viterbi decoder. Both designs provide good PAPR performance through analyses and simulations in this thesis.