Patent ID: 7308018

Claim:
A method for operating a digital mobile radio network with orthogonally structured space-time block transmission codes with maximum diversity n×m for a transmitting station having n transmitter antennas and a receiving station having m receiver antennas, where m and n are each an integer greater than or equal to 2, comprising: transmitting a set of 2 l data bit vectors {right arrow over (b)}=(b 1 , b 2 , . . . b l )εB l with l bits b i ε{0,1} from the transmitting station, the data bit vectors {right arrow over (b)} being mapped by a one-to-one mapping STM ⁢ : B l → U ⁡ ( n ) b ⇀ → C ⁡ ( b ⇀ ) onto a set of 2 l space-time code symbols C k , k=0, 2, . . . , 2 l −1, with each space-time code symbol C k corresponding to a unitary n×n matrix; interpreting matrix elements c ijk , i=1, . . . n, of each of the 2 l space-time code symbols C k as space-time variables so that: the matrix elements c ijk have corresponding signals transmitted by the n transmitter antennas, and on transmission of one of the 2 l code symbols C k , a corresponding signal is transmitted for each of the matrix elements c ijk , the corresponding signal being transmitted from a transmitter antenna i of the n transmitter antennas, in a time interval j via a fading channel associated with the transmitter antenna i; receiving signals transmitted in the time interval j corresponding to the matrix elements c ijk of the code symbol C k at each of the m receiver antennas of the receiving station within range of the transmitting station; decoding a corresponding data bit vector {right arrow over (b)}εB l to be transmitted, by: performing a reverse mapping STM - 1 ⁢ : U ⁡ ( n ) → B l C ( b → ) → b → due to an orthogonal structure of a transmission code formed by the space-time symbols C k , and decoupling the signals transmitted by the n transmitter antennas and the corresponding matrix elements c ijk ; and constructing the matrix elements c ijk of the space-time symbols C k as the elements of 2 l unitary n×n matrices according to the following specification: C k = ( C 11 ⁢ k c 1 ⁢ n ⁢ ⁢ k ⋯ c n ⁢ ⁢ 1 ⁢ ⁢ k c nnk ) = V ⁡ ( exp ⁡ ( 2 ⁢ π ⁢ ⁢ j 2 l ⁢ q 1 ⁢ k ) 0 ⋯ 0 exp ⁢ 2 ⁢ π ⁢ ⁢ j 2 l ⁢ q 1 ⁢ k ) ⁢ V - 1 where V is any unitary complex n×n matrix, c ijk are the generally complex matrix elements of the space-time symbol C k , j is an imaginary unit, q i , where i=1, . . . , n, is any odd whole number, and k=0, 1, . . . , 2 l −1.