The invention provides a method for
spread spectrum modulation and
demodulation of code element grouping time-shifting position. A method for the
spread spectrum modulation is on the basis of a good autocorrelation characteristic of a direct spread code. On the basis of primary
direct sequence spread spectrum modulation, secondary time-shifting position modulation is conducted on
spread spectrum modulation code elements and the
spread spectrum modulation code elements after the secondary time-shifting position modulation are overlaid to a
route of signals to be output; the secondary time-shifting position modulation of the
spread spectrum modulation code elements is added by the method for the
spread spectrum modulation, so that the
transmission rate of a
system is greatly improved; specific positions of the spread spectrum modulation code elements are detected firstly by a method for the spread spectrum
demodulation and information carried by the positions is demodulated, so that position demodulating data are obtained, information carried by the spread spectrum modulation code elements is modulated on this basis until direct spread demodulating data are obtained, and finally the demodulated data are output according to a prior
data stream format.