A closed loop transmit antenna diversity system for a wideband code division multiple access, WCDMA, communication system, comprising: a transmitting station comprising at least a first antenna, A12 1, and a second antenna, A12 2, for sending a plurality of slots, wherein each of the plurality of slots comprises a first channel comprising a first set of pilot symbols corresponding to the first antenna and a second set of pilot symbols corresponding to the second antenna and a second channel comprising another set of pilot symbols; a user station comprising: despreading circuitry for receiving and despreading the plurality of slots received from the transmitting station; circuitry for measuring a first channel measurement for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot; circuitry for measuring a second channel measurement for each given slot in the plurality of slots from the second transmit antenna and in response to the second set of pilot symbols in the given slot; characterised by circuitry for determining beamformer coefficients by measuring a phase difference value for each given slot in the plurality of slots in response to the first channel measurement and the second channel measurement for the given slot and in response to a ninety degree constellation rotation of the given slot relative to a slot which was received by the despreading circuitry immediately preceding the given slot. a transmitting station comprising at least a first antenna, A12 1, and a second antenna, A12 2, for sending a plurality of slots, wherein each of the plurality of slots comprises a first channel comprising a first set of pilot symbols corresponding to the first antenna and a second set of pilot symbols corresponding to the second antenna and a second channel comprising another set of pilot symbols; a user station comprising: despreading circuitry for receiving and despreading the plurality of slots received from the transmitting station; circuitry for measuring a first channel measurement for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot; circuitry for measuring a second channel measurement for each given slot in the plurality of slots from the second transmit antenna and in response to the second set of pilot symbols in the given slot; characterised by circuitry for determining beamformer coefficients by measuring a phase difference value for each given slot in the plurality of slots in response to the first channel measurement and the second channel measurement for the given slot and in response to a ninety degree constellation rotation of the given slot relative to a slot which was received by the despreading circuitry immediately preceding the given slot. despreading circuitry for receiving and despreading the plurality of slots received from the transmitting station; circuitry for measuring a first channel measurement for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot; circuitry for measuring a second channel measurement for each given slot in the plurality of slots from the second transmit antenna and in response to the second set of pilot symbols in the given slot; characterised by circuitry for determining beamformer coefficients by measuring a phase difference value for each given slot in the plurality of slots in response to the first channel measurement and the second channel measurement for the given slot and in response to a ninety degree constellation rotation of the given slot relative to a slot which was received by the despreading circuitry immediately preceding the given slot.