Patent ID: 7280824

Claim:
A wireless communication system comprising: a terminal station; a center station device which forms a baseband signal to the terminal station; and a plurality of access point devices which receive delivered signals from the center station device through a cable network, have cover areas partially overlapping to constitute a service area by all the cover areas, and emit radio waves having frequencies not lower than a millimeter wave band to the terminal station; and wherein each of the access point devices has a configuration in which a transmission signal main body in a radio frequency band and a local oscillation signal having a radio frequency are simultaneously sent on the basis of the received delivered signal; wherein the terminal station has square-law means which performs a square-law detection of a synthesized signal of the received transmission signal main body and the local oscillation signal; wherein the center station device transmits an intermediate frequency signal obtained by up-converting a frequency of the baseband signal into an intermediate frequency band to the access point devices as delivered signals; wherein each of the access point devices up-converts the delivered signal into a transmission signal main body by using a local oscillation signal to transmit the transmission signal main body and the local oscillation signal in a wireless manner; wherein, when the terminal station is located at a boundry between the cover areas, different radio frequencies are assigned to the plurality of access point devices from which the terminal station simultaneously receives signals; and wherein wireless frequencies f 1 and f 2 of two of the access point devices from which the terminal station simultaneously receives signals satisfy a conditional equation given by Equation (A): B<f 2 −f 1 <f IF −(3 B/ 2) ( A ) where f IF is a center frequency of an intermediate frequency signal, and B is a modulate band width of the intermediate frequency signal.