Patent ID: 7330496
Filing Date: 2008-02-12
Classification: H04J

Abstract:
1. A communication system for carrying out spread spectrum communication, comprising: first storage means for storing spreading codes orthogonal to each other; second storage means for storing inverse spreading codes corresponding to the spreading codes stored in the first storage means; spreading means for spreading an input signal by using the spreading codes stored in the first storage means; and inverse spreading means for inversely spreading a signal outputted from the spreading means by using the inverse spreading codes stored in the second storage means, wherein the spreading codes stored in the first storage means are included in a vector group obtained by carrying out inverse Fourier transform of a plurality of different channel identification codes generated from orthogonal codes, each element of the spreading codes is a complex number, each element of the inverse spreading codes is a complex number, and each element of the inverse spreading codes is a conjugate complex number of a corresponding element of the spreading codes, the spreading means carries out complex multiplication of the input signal and each element of the spreading codes, and the inverse spreading means carries out complex multiplication of the signal outputted from the spreading means and each element of the inverse spreading codes.