A method for controlling downlink transmission by a subscriber station communicating with a base station in an orthogonal frequency division multiplexing, OFDM, network, the method comprising: receiving a first pilot signal transmitted from a first antenna of the base station, and receiving a second pilot signal transmitted from a second antenna of the base station; estimating a channel between the base station and the subscriber station based on the received first and second pilot signals; determining OFDM symbol processing parameter set based on estimating the channel, wherein the OFDM symbol processing parameter set, comprising gain values and delay values obtained by using factors including a channel type and a mobile speed of the subscriber station, is fed back to the base station to control the relative gains and the relative delays of first and second processed OFDM symbols to be transmitted from the first and second antennas; transmitting (440, 505) the OFDM symbol processing parameter set to the base station; receiving (510, 605) a further first pilot signal transmitted from the first antenna, and receiving (515, 610) a further second pilot signal transmitted from the second antenna; characterized by compensating (615, 620) the further first and second pilot signals based on the OFDM symbol processing parameter set, and combining the compensated first and second pilot signals; estimating the channel based on the combined compensated first and second pilot signals receiving (520, 650) the first processed OFDM symbols transmitted from the first antenna, and receiving (525, 650) the second processed OFDM symbols transmitted from the second antenna; and demodulating the first and second processed OFDM symbols by using the channel estimate based on the combined compensated first and second pilot signals. receiving a first pilot signal transmitted from a first antenna of the base station, and receiving a second pilot signal transmitted from a second antenna of the base station; estimating a channel between the base station and the subscriber station based on the received first and second pilot signals; determining OFDM symbol processing parameter set based on estimating the channel, wherein the OFDM symbol processing parameter set, comprising gain values and delay values obtained by using factors including a channel type and a mobile speed of the subscriber station, is fed back to the base station to control the relative gains and the relative delays of first and second processed OFDM symbols to be transmitted from the first and second antennas; transmitting (440, 505) the OFDM symbol processing parameter set to the base station; receiving (510, 605) a further first pilot signal transmitted from the first antenna, and receiving (515, 610) a further second pilot signal transmitted from the second antenna; characterized by compensating (615, 620) the further first and second pilot signals based on the OFDM symbol processing parameter set, and combining the compensated first and second pilot signals; estimating the channel based on the combined compensated first and second pilot signals receiving (520, 650) the first processed OFDM symbols transmitted from the first antenna, and receiving (525, 650) the second processed OFDM symbols transmitted from the second antenna; and demodulating the first and second processed OFDM symbols by using the channel estimate based on the combined compensated first and second pilot signals.