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This is the first book on higher-dimensional Hadamard matrices and their applications in telecommunications and information security.It is divided into three parts according to the dimensions of the Hadamard matrices treated.The first part stresses the classical 2-dimensional Walsh and Hadamard matrices.Fast algorithms,updated constructions,exitence results,and their generalised forms are presented.The second part deals with the lower-dimensional cases,e.g.3-,4-,and 6-dimensional Walsh and Hadamard matrices and transforms.The third part iS the key part.which investigates the N-dimensional Hadamard matrices of order 2,which have been proved equivalent to the well known H-Boolean functions and the perfect binary arrays of order 2.After introducing the definitions of the regular,proper,improper,and generalized higher-dimensional Hadamard matrices,many theorems about the existence and constructions are presented.Perfec binary arrays,generalized perfect arrays,and the orthogonal designs are also used to construct new higher-dimensional Hadamard matrices.The many open problems in the study ofthe theory ofhigher-dimensional Hadamard matrices which are also listed in the book will encourage further research.
This volume will appeal to researchers and signal processing,coding,information security graduate students whose work involves and applied discrete mathematics.
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