Patent ID: 7200368
Filing Date: 2007-04-03
Classification: H04B

Abstract:
1. A method for transmitting a transmission signal via an antenna array to a receiving unit of a wireless communication system, comprising: dividing said transmission signal into at least two signal parts; transmitting said at least two signal parts by using transmission beams of at least two subarrays of said antenna array; controlling the transmission beams of at least one of said two subarrays at least in part based on feedback information received from said receiving unit; detecting channel characteristics of a transmission channel; and changing a predetermined hopping pattern based on the detected channel characteristics of the transmission channel; wherein said feedback information is generated based on a channel measurement using pilot channels of predetermined antenna elements of at least one of said at least two subarrays, a number of predetermined antenna elements being smaller than a total number of the antenna elements, and the receiving unit measuring the channels of all antenna elements of the antenna array based on channel measurements using only the pilot channels of the predetermined antenna elements; and wherein at least one of said predetermined antenna elements changes between slots of said transmission signal according to the predetermined hopping pattern.