Patent ID: 6628667
Filing Date: 2003-09-30
Classification: H04J

Abstract:
A variable rate transmission apparatus for transmitting data signals, comprising:a signal processing configuration for effecting a series of signal processes on said data signals; a first serial/parallel converter for performing serial/parallel conversion on the output of said signal processing configuration; a spread modulation configuration for spread modulating data signals, upon a transmission rate of said data signals being greater than or equal to a predetermined transmission rate, in a binary sequence using bi-orthogonal signals, and spread modulating data signals in a binary sequence without using bi-orthogonal signals when said data signals are transmitted at a rate lower than the predetermined transmission rate; and a transmitting configuration which transmits the spread modulated data signals that are outputted from said spread modulation configuration, wherein said spread modulation configuration modulates parallel signals outputted from said first serial/parallel converter, and said transmitting configuration transmits the resultant signals, respectively.