Closed loop feedback system for improved down link performance

Details Closed loop feedback system for improved down link performance Closed loop feedback system for improved down link performance

H - Electricity

04

B

H04B 7/04 (2006.01) H04B 7/06 (2006.01) H04B 7/26 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2525146

A method includes receiving at least two space-time coded signals from an antenna system associated with a first station, determining complex channel state information based on the received space-time coded signals, and sending the complex channel state information to the first station. In an alternative embodiment, a method includes transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array, measuring a channel impulse response for each space- time coded signal at a second station, and sending an indicia of a selected set of least attenuated signals from the second station to the first station. The multi- beam antenna array is associated with a first station. The beams transmit a signature code embedded in each respective space-time coded signal, and the signature codes are orthogonal so that the second station can separate and measure the channel impulse response corresponding to each space-time coded signal. The space-time coded signals include the selected set of least attenuated signals and a remaining set of most attenuated signals. In an alternative embodiment, a method includes selecting at least two beams of plural beams formed by a mufti-beam antenna array associated with a first station for transmission of a corresponding at least two space-time coded signals produced by a space-time encoder, determining a time delay associated with each of the at least two space-time coded signals as received in each respective beam, and setting into a variable delay line the time delay corresponding to each beam, each variable delay line being coupled between the multi-beam antenna array the space-time encoder.

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