Application of Rate-Compatible Punctured Convolutional Codes over OFDM Systems

• Main Authors: Zhong-Qing Lin, 林忠慶
• Other Authors: Yu-Sun Liu
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/12460242893860820784

碩士 === 國立臺北科技大學 === 電腦通訊與控制研究所 === 92 === In this thesis, we investigate the applications of rate-compatible punctured convolutional codes in OFDM systems. Both diversity combination method and code combination method are considered over a Rayleigh fading channel with Doppler effect. We consider convolutional codes with and without bit-interleaver. Bit error rate is obtained for both systems with either soft-decision or hard-decision Viterbi decoding algorithm. Simulation results show that both diversity combination method and code combination method significantly improve the system performance. Not surprisingly, bit error rate of systems using soft-decision Viterbi decoding algorithm is less than that of systems using hard-decision Viterbi decoding algorithm, and the performance of systems with bit-interleaver is better than those without.