Patent ID: 8306141

Claim:
Method for determining shifting parameters p 1 and p 2 to be used by a first and a second telecommunication devices for mapping symbols on sub-carriers, the first telecommunication device comprising at least two transmit antennas, the symbols being transferred through each antenna of the first telecommunication device on at least an even number ‘M 1 ’, strictly greater than two, of sub-carriers allocated to the first telecommunication device, the second telecommunication device comprising at least two transmit antennas, the symbols being transferred through each antenna of the second telecommunication device on an even number ‘M 2 ’, equal or greater than M 1 , of sub-carriers allocated to the second telecommunication device, the first telecommunication device transferring on a first antenna of the first telecommunication device during a time slot on each frequency ‘k 1 ’, with k 1 =0 to M 1 −1, a signal representing a symbol ‘X k1 ’ in the frequency domain, the first telecommunication device transferring on a second antenna of the first telecommunication device during the time slot, on each frequency ‘k 1 ’, with k 1 =0 to M 1 −1a signal representing a symbol ‘X′ k1 ’ derived from the symbol X k1 , for each frequency k 1 , by the formula X′ k1 secondAnt =ε(−1) k1+1 X* (p 1 −1−k1)modM 1 , where ε is 1 or −1, X* means the complex conjugate of X, p 1 −1−k 1 is taken modulo M 1 and p 1 even, the second telecommunication device transferring on a first antenna of the second telecommunication device during a given time slot on each frequency ‘k 2 ’, with k 2 =0 to M 2 −1, a signal representing a symbol ‘Y k2 ’ in the frequency domain, the second telecommunication device transferring on a second antenna of the second telecommunication device during the same given time slot, on each frequency ‘k 2 ’, with k 2 =0 to M 2 −1, a signal representing a symbol ‘Y′ k2 ’ derived from the symbol Y k2 , for each frequency k 2 , by the formula Y′ k2 secondAnt =ε(−1) k2+1 Y* (p2−1−k2)mod M2 where p 2 −1k 2 is taken modulo M 2 and p 2 even, the method comprises the steps of: allocating to the first and the second telecommunication devices sub-carriers, at least a part of the sub-carriers allocated to the first telecommunication device being also allocated to the second telecommunication device, determining the shifting parameter p 2 , the shifting parameter p 2 being even and at least equal to the number of overlapping sub-carriers allocated to both the first and the second telecommunication devices or the shifting parameter p 2 being even and at most equal to M 2 minus the number of overlapping sub-carriers allocated to both the first and the second telecommunication devices.