Patent ID: 7760814

Claim:
A wireless transmission method for indoor application for a parallel wireless transmission of digital partial data streams formed into a number n of data subsignals by a space-time coding in dependency of the selected data modulation format, in a frequency limited multi-path transmission channel between a number n of transmission paths and a number m (m≧n) receiving paths positioned at different indoor positions, including measurement of the elements of the complex valued channel matrix for estimating the space-time behavior of the transmission channel and space-time signal processing in the receiving paths by determining a weighting matrix derived from the complex valued channel matrix for the simultaneous recovery of the data subsignals, which are reconstructed into their digital partial data streams, characterized by the fact that each transmission channel (S i , I=1 . . . n) is marked by an unambiguously recognizable pilot signal (P i (t)) of known structure, encoding, and good correlation properties which is superimposed in a low flow manner on the respective transmitted data subsignal (D i (t)) as a marking pilot sequence ( Pni ) and that the superimposition is transmitted as the transmission signal (S i (t)), that the measuring of the elements (H ij ) of the complex valued channel matrix ([H]) is executed simultaneously with the parallel transmission of the transmission signal (S i (t)) and is based upon the pilot sequences ( Pni ) the transmitted structures of which are measured in every transmission path (E j , j=1 . . . m) and correlated with the known structures, and that each data subsignal (D i (t)) for its recovery is presented as an analog weighted linear combination of all receiving signals (E j (t)), the analog weighting signals (I ij (t)) being elements of a weighting matrix ([I]), determined by means of a geometric projection technique of purely algebraic structure from the complex valued channel matrix ([H]).