Patent ID: 6865174

Claim:
A code division multiple access communication system in which in a transmitter, a code division multiple signal, composed of a data division obtained by multiplying a baseband data and an orthogonal code and a preamble division including synchronization code sequences to attain the chip synchronization of the orthogonal code in a receiver, is modulated with a carrier having a given center frequency and transmitted, and in the receiver, a correlation peak is detected from among the synchronization code sequences in the preamble division by a surface acoustic wave matched filter and the baseband data in the data division is demodulated by the orthogonal code generated on the detection timing, wherein the period of the synchronization burst, in the preamble division (T burst ), which is composed of a synchronization packet division having at least one synchronization code sequence and a dummy division next to the packet division, is set equally to the period of one symbol in the data division (T symbol ).