Patent ID: 7209765

Claim:
A wireless data communication system comprising: a single transmitter; and a plurality of receivers for communicating with the single transmitter using the same frequency signal at the same time, wherein the transmitter includes: a plurality of transmission (Tx) antennas; and a Space Division Multiple Access (SDMA) transmission (Tx) processor for multiplying each of signals transmitted to the receivers by a complex coefficient, distributing the multiplied result to the Tx antennas, adding the signals distributed to the same Tx antennas, and transmitting the added result to each Tx antenna, wherein each of the receivers includes: at least one reception (Rx) antenna; and an SDMA reception (Rx) processor for multiplying signals received via the Rx antennas by a complex coefficient, adding the multiplied result to the received signals, and creating specific signals equal to or less than the number of Rx antennas, and wherein an SDMA-control signal process of the SDMA Tx processor, transmission characteristics of space propagation signals, an SDMA-control signal process of the SDMA Rx processor are synthesized with each other, such that signals transmitted to the remaining receivers other than a desired receiver are suppressed.