| 摘要 |
The present invention relates to a method for transmitting a word representative of transmission parameters respectively allocated to the mobile stations in communication with a base station of a mobile telecommunication system, said system being designed in such a way that each mobile station in communication with said base station transmits data in bursts including a midamble or a sum of midambles forming a general midamble that is affected to said mobile station and in such a way that said or each midamble is used for estimating the channel response between said mobile station and said base station, all said available midambles being derived from an unique basic midamble code by retaining only the elements of said basic midamble code which belong to respective predefined windows shifted one relative to another, said estimations being performed by correlating the received signal with a sequence based on said basic midamble code and channel estimation output being in temporal positions in one-to-one relationship with said available midambles, wherein it includes the step of : including, when data are transmitted from a base station to a mobile station, in each transmission burst a general midamble resulting from the sum of selected midambles among all the available midambles, said selection being done by said base station in relation with a word so that a selected midamble corresponds to a binary element of said word equal to a first value and a non-selected midamble corresponds to a binary element of said word equal to second value, considering, at each mobile station side, after having correlated the signal received by said mobile station with a sequence based on the basic midamble code used during the formation of all said midambles, a word the elements of which are in one-to-one relationship with the temporal positions of the estimations respectively corresponding to said available midambles, an element of said word being equal to said first value when the corresponding position includes an estimation of the channel between the base station and the mobile station and being equal to said second value when the corresponding position doesn't, said word equal to the word to be transmitted enabling said mobile station to have a knowledge of said transmission parameters. <IMAGE> |
