Closed loop feedback system for improved down-link performance

The method comprises: Received from the first station associated antenna system at least two space-time coded; signalTo receiving space time coded signal to determine the producing channel state information; A sending with a circular channel state information to the first station. In one embodiment, the method comprises: At least two space-time coded signal of the respective wave beam of multi-beam antenna array; Said the channel detection responses of each space-time coded signal in the second); From the second the transmitting a symbol of a group of minimum attenuation signals to the first and. The multi-beam antenna array and first associated. The wave beam transmission of the code state in width space-time coded signal; the state coding and quardratures, so the second) is connected to retain and each said and space-time coded corresponding signal channel detection responses. The space-time coded signal comprises a group of minimum attenuation signals and other group of maximum attenuation signals for selecting. In one embodiment, the method comprises: A selecting at least two wave beams with multiple wave beams on the first) association's multi-beam antenna array formed, so that the number of the corresponding to at least two space-time coded signal of the space-time encoder generating; For determining at least two space-time coded signal in each related delay in the same wave beam; aWith a terminal of the wave beam corresponding latencies a variable delay circuit; each delaying wire connected between the multi-beam antenna array and space-time encoder.