Patent ID: 7187723

Claim:
A local oscillation signal supply method that is used when received signals, which are received as input by way of a plurality of receivers that are each connected to respective antennas, are demodulated and outputted by a digital signal processor, the method comprising: generating frequency data that contain a frequency component; sending said frequency data as a common signal source to each of said plurality of receivers via signal sequences that correspond to a wireless channel, the signal source supplied as a digital signal; in each of said receivers, converting the digital signal to an analog signal based on a clock signal that is common to all of said receivers; and in each of said receivers, generating local oscillation signals in which phase and amplitude are matched in all of said receivers based on said analog signal, wherein the frequency data that are received from the plurality of said signal sequences are each subjected to quadrature amplitude modulation to generate respective of the local oscillation signals having a prescribed frequency.