Permutation sequences and coded PAM signals with spectral nulls at rational submultiples of the symbol frequency

作     者：Ouahada, Khmaies Swart, Theo G. Ferreira, Hendrik C. 

作者机构：Univ Johannesburg Dept Elect & Elect Engn Sci ZA-2006 Auckland Pk South Africa 

出 版 物：《CRYPTOGRAPHY AND COMMUNICATIONS-DISCRETE-STRUCTURES BOOLEAN FUNCTIONS AND SEQUENCES》 (密码学与通讯)

年 卷 期：2011年第3卷第2期

页      面：87-108页

核心收录：

学科分类：07[理学] 070104[理学-应用数学] 0701[理学-数学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：Code constructions Distance-preserving mappings Permutation coding Pulse amplitude modulation Spectral shaping 

摘      要：Coded PAM signals with spectral nulls at rational submultiples of the symbol frequency are presented. Spectral shaping using permutation symbols and distance-preserving mappings (DPMs) are two techniques presented in this paper to design codes with better error correction capability, which make them achieve a significant decoding gain compared to other published codes. The use of Viterbi decoding algorithm, gives these new codes an advantage with their property of no error propagation. The well shaped power spectral densities of these new codes may overcome some communications problem like zero frequency components.