Code shift keying (CSK) apparatus and method for spectrum spread communication

摘要

In a Code Shift Keying (CSK) communication method and apparatus on the signal transmitting side, one of a plurality of code series equal in code length are produced with a predetermined period. The code series to actually be transmitted has a maximum value of its autocorrelation which is always larger than that of the cross-correlation of said code series. In every predetermined period, one series is selected; the selection depends on the transmitting data so that the selected series is transmitted as a transmitting signal. On the signal receiving side, a received signal is compared with each of said code series which are the same as those of the signal transmitting side, to provide correlation outputs. The correlation outputs are subjected to comparison, and the receiving data is selected according to the result of comparison. <IMAGE>