Patent ID: 7554944

Claim:
A method of data transmission in a cellular communication system including a base station used for mobile station data transmission over a downlink, in which the mobile station transmits base station data over an uplink, comprising the following steps: (a) M diversity groups of transmission channels each having K transmission channels, where M≧1, K≧1, are formed at the base station, (b) a pilot signal is transmitted from the base station to the mobile station from each of M·K transmission channels of diversity groups, (c) impulse responses of M·K transmission channels of diversity groups are estimated at the mobile station using the transmitted pilot signals, (d) L m sets of weighting coefficients of transmission direction each having K−1 weighting coefficients of transmission direction, where 1≦L m ≦K and m=1,2, . . . , M are formed at the mobile station for each of M diversity groups of transmission channels, (e) for each of M diversity groups of transmission channels for each of L m sets of weighting coefficients of transmission direction, a transfer function of a channel of directional transmission corresponding to the set is estimated at the mobile station using the estimated impulse responses of M·K transmission channels of diversity groups, (f) a feedback signal containing L m weighting coefficients of transmission direction formed for each of M diversity groups of transmission channels and an estimated transfer function for each of L m weighting coefficients of transmission direction for each of M diversity groups of transmission channels are transmitted from the mobile station to the base station, (g) L m channels of directional transmission are formed at the base station for each of M diversity groups of transmission channels using the transmitted sets of weighting coefficients of transmission direction, (h) channels of signal spectrum correction are formed at the base station for each of M diversity groups of transmission channels for each of L m channels of directional transmission and their transfer functions are corrected according to the transmitted estimated transfer functions of channels of directional transmission in such a way that the reception quality of an information signal at the mobile station is maximized, and (i) information signal copies are formed at the base station for each of M diversity groups of transmission channels for each of L m channels of directional transmission and all formed copies of the information signal are simultaneously transmitted over the corresponding channels of directional transmission after applying them to the respective channels of signal spectrum correction.