Patent ID: 6192256
Filing Date: 2001-02-20
Classification: H01Q,H04B

Abstract:
A communication device comprising:a receiver, the receiver receiving a reference signal transmitted through each of a plurality of antennas in a transmitting communication device, the receiver having a memory storing a codebook, the codebook containing codebook weights for a transmit path associated with the transmitting communication device;circuitry for calculating at least one weight for a transmit path of the transmitting communication device from the reference signal received from each antenna;a transmitter for transmitting the at least one weight to the transmitting communication device,the memory storing codebook weights of a previous transmit path, the circuitry using the codebook and the weights of the previous transmit path to calculate the at least one weight, the codebook being checked to see if it is the same as a codebook in the transmitting communication device, by transmitting the codebook from one of the receiving and transmitting communication devices to the other of the receiving and transmitting communication devices.