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Gold codes, Hadamard partitions and the security of CDMA systems

机译:黄金代码,Hadamard分区和CDMA系统的安全性

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Let V = {1, 2, . . . , M} and let {Hi: i Î V}{{H_i{:} i in V}} be a set of Hadamard matrices with the property that the magnitude of the dot product of any two rows of distinct matrices is bounded above. A Hadamard partition is any partition of the set of all rows of the matrices H i into Hadamard matrices. Such partitions have an application to the security of quasi-synchronous code-division multiple-access radio systems when loosely synchronized (LS) codes are used as spreading codes. A new generation of LS code can be used for each information bit to be spread. For each generation, a Hadamard matrix from some partition is selected for use in the code construction. This code evolution increases security against eavesdropping and jamming. One security aspect requires that the number of Hadamard partitions be large. Thus the number of partitions is studied here. If a Kerdock code construction is used for the set of matrices, the Hadamard partition constructed is shown to be unique. It is also shown here that this is not the case if a Gold (or Gold-like) code construction is used. In this case the number of Hadamard partitions can be enumerated, and is very large.
机译:设V = {1,2,... 。 。 ,M},然后让{H i :iÎV} {{H_i {:} i in V}}是一组Hadamard矩阵,其性质为任意两个点积的大小不同矩阵的行在上方限制。 Hadamard分区是矩阵H i 的所有行的集合到Hadamard矩阵中的任何分区。当将松散同步(LS)码用作扩展码时,此类分区可应用于准同步码分多址无线电系统的安全性。新一代的LS代码可用于每个要扩展的信息位。对于每一代,从某个分区中选择一个Hadamard矩阵用于代码构造。此代码演变提高了防止窃听和阻塞的安全性。一个安全方面要求Hadamard分区的数量很大。因此,这里研究分区的数量。如果将Kerdock代码构造用于矩阵集,则构造的Hadamard分区将显示为唯一。在此还表明,如果使用Gold(或类Gold)代码结构,则不是这种情况。在这种情况下,Hadamard分区的数量可以枚举,并且非常大。

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