Fountain Codes for OFDM Multicast Systems with PAPR Reduction Capability

• Main Authors: Hsin-Liang Chiu, 邱信良
• Other Authors: 林茂昭
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/22649665133635719117

碩士 === 國立臺灣大學 === 電信工程學研究所 === 97 === Recently, fountain codes have got much attention not only in theoretic researches but also in practical applications. Instead of using ARQ (Automatic Retransmit request) methods which may cause large amount of retransmissions for Multicast communication while packet-losses happen among the multicast links, it is more suitable to apply fountain codes for it. In this thesis, we consider an OFDM multicast system which uses fountain codes as packet-level codes to achieve its transmissions. We propose several designs in generating specific fountain codes to solve the inherent high PAPR (Peak-to-Average Power Ratio) problem in OFDM systems. Compared to other usual PAPR reduction methods which need additional side information in the physical layer, our designs require no additional side information in the physical layer. Moreover, the decoding performance of proposed fountain codes maintains almost the same as that of usual fountain codes. Mathematical analyses and simulations verify the excellence of our designs.