PURPOSE: To reduce odd mutual correlations, to establish a symbol synchronization with a simple constitution and to simplify the constitution of the reception part of a base station.

CONSTITUTION: A spread spectrum multiple access communication is performed by using the spreading code of polyphase orthogonal series between a base station 1 and plural moving machines 2. By setting the information channel corresponding to a common channel 5 for synchronization and each moving machine to the outgoing line from the base station to the moving machine and delaying the signal of each information channel, a chip deviation is generated between the transmission symbol timing of this information channel and the symbol timing of the common channel for synchronization and the delay amount 8 in each information channel is set so that the size of the chip deviation in each information channel at the time may be evenly distributed within the range of a chip deviation width. By making the signal of each information channel modulated by the spreading code of the polyphase orthogonal series have the chip deviation, odd mutual correlations are reduced. The moving machines are capable of detecting its own correlation without receiving the interferences between other stations. The base station is capable of performing correlation detection of the signal of each moving machine without odd mutual correlations because the signals transmitted from each moving machine mutually have chip deviations.