Patent ID: 7406336
Filing Date: 2008-07-29
Classification: H04B,H04L

Abstract:
1. A method in an transmitter of a multi-carrier system, said transmitter transmitting one or more data streams over a set of M antennas to a plurality of mobile terminals, comprising the steps of: transmitting a number of pilot sequences comprising an ordered set of symbols, wherein each symbol is associated with a predetermined time and frequency resource and a complex transmission weight for each antenna; adapting the transmission weights associated to the pilot sequences to achieve an optimisation of an objective function of the set of quality indicators, which the mobile terminals have derived from measurements of at least one downlink channel property; transmitting said pilot sequences with the adapted transmission weights; and, transmitting one or several information streams using the one or several of the adapted transmission weights; wherein the step of adapting the transmission weights comprises the steps of: