Patent ID: 7822159

Claim:
A master communication device for communicating in synchronization with a slave communication device with no sync timing adjustment feature, the master communication device comprising: a transmission-signal-generation-timing adjuster for receiving sync signal generation timing information from the slave communication device and adjusting timing of a transmission signal to be subsequently transmitted to the slave communication device, the sync signal generation timing information indicating a generation timing of a sync signal to be used when the slave communication device receives a transmission signal from the master communication device and for adjusting a transmission timing of a signal to be transmitted to the slave communication device based on the sync signal generation timing information, wherein adjusting the transmission timing of the signal to be transmitted to the slave communication device comprises establishing, in the master communication device, frame synchronization between the master communication device and the slave communication device that is to receive the transmission signal by establishing a coincidence of start positions of a code sequence generated by the slave communication device and a code sequence transmitted by the master communication device and establishing a coincidence of start positions of a pulse signal generated by the slave communication device and a pulse signal transmitted by the master communication device; and a transmitter for transmitting the transmission signal at the transmission timing thus adjusted when synchronization is established, wherein the transmission-signal-generation-timing adjuster adjusts a generation timing of the transmission signal until the slave communication device can receive the transmission signal from the master communication device.