Patent ID: 8731102

Claim:
A transmitter comprising: multiple transmit antennas; a conversion unit configured to generate multiple signal sequences corresponding to a predefined frequency bandwidth from one or more transmission streams associated with any of the transmit antennas; a precoding unit configured to weight each of the signal sequences with a precoding matrix; and a transmitting unit configured to convert an output signal from the precoding unit into a number of signals corresponding to the number of transmit antennas and transmit the converted signals from the transmit antennas, wherein if closed-loop control is performed, the precoding unit uses a precoding matrix specified from a codebook based on a precoding matrix indicator fed back from a receiver, and if open-loop control without relying on a feedback from the receiver is performed, the precoding unit uses a precoding matrix specified from a codebook such that mutually different precoding matrices are applied to the different signal sequences.