Patent ID: 7242724
Filing Date: 2007-07-10
Classification: H04B,H04L

Abstract:
1. A method of transmitting signals from a transmitter comprising two or more transmit antennas in a mobile telecommunications network, the method comprising determining channel state information, estimating reliability of the channel state information, space time block encoding at least one data sequence, before transmitting the data sequence, applying to the data sequence a linear transformation so as to at least partially compensate for channel variations, the linear transformation being dependent upon the channel state information and dependent upon the estimated reliability of the channel state information, in which where the channel state information is channel estimates in the form of channel coefficients, and the channel state information for a time interval (n) is assumed accurate for the previous time interval (n−1), the channel state information reliability (ρ) is determined as  where h is the channel vector, f is the latest channel state information, and α is a forgetting factor.