Patent ID: 7668510

Claim:
A transmitting/receiving apparatus comprising: a channel estimation section that performs channel estimation for a known symbol of a received signal; a storage section that stores a channel estimation value estimated at said channel estimation section; a determination section that determines a correlation between a known symbol of a received signal received earlier and stored in said storage section and a known symbol of a currently received signal and determines whether or not the correlation is a value enabling space division multiplexing communication with directivity control by a communicating party; a weight generating section that generates a transmitting weight from a result of the channel estimation; a multiplying section that multiplies a transmission signal by the transmitting weight generated at said weight generating section; a transmitting section that transmits the signal multiplied by the transmitting weight at said multiplying section; a timer section that measures a time, when said weight generating section takes to generate the transmitting weight; and a switching section that, when said determination section determines that space division multiplexing communication with directivity control is possible and when the time for generating the transmitting weight, which is measured by said timer section, is less than a predetermined time, outputs the transmitting weight generated by said weight generating section to said multiplying section, and, when said determination section determines that space division multiplexing communication with directivity control is not possible and when the time for generating the transmitting weight, which is measured by said timer section, is equal to or greater than the predetermined time, outputs “1” as the transmitting weight to said multiplying section.