Method and a device for determining a shifting parameter to be used by a telecommunication device for transferring symbols

A device for determining a shifting parameter p to be used by a telecommunication device for mapping symbols on sub-carriers,

• the device for determining a shifting parameter comprising:
• means for allocating sub-carriers to the telecommunication device, the sub-carriers being grouped in at least two clusters, each cluster being separated from another cluster by at least one sub-carrier not allocated to the telecommunication device, wherein the telecommunication device includes at least two transmit antennas, the symbols being transferred through each antenna of the telecommunication device on at least an even number K, strictly greater than two, of sub-carriers allocated to the telecommunication device, the telecommunication device transferring on a first antenna of the telecommunication device during a time slot on each allocated sub-carrier ‘k’, with k=0 to K−1, a signal representing a symbol ‘Xk’ in the frequency domain, and the telecommunication device transferring on a second antenna of the telecommunication device during the time slot, on each allocated sub-carrier ‘k’, with k=0 to K−1, a signal representing a symbol ‘X′k’ derived from the signal transferred on the first transmit antenna, for each frequency k, by the formula X′ksecondAnt=ε(−1)k+1X*(p-1-k)mod K, where ε is 1 or −1, X* indicating the complex conjugate of X, p-1-k is taken modulo K, K even and p even;
• and
• means for determining the shifting parameter p, the shifting parameter p being determined according to clusters of sub-carriers allocated to the telecommunication device,
• wherein the means for determining determines an equidistant subcarrier which is equally distanced from a first indexed sub-carrier and a last indexed sub-carrier allocated to the telecommunication device and determines the shifting parameter p based on one of two different methods according to whether the equidistant subcarrier is or is not a sub-carrier allocated to the telecommunication device,
• wherein if the equidistant sub-carrier is a sub-carrier allocated to the telecommunication device, the shifting parameter p is equal to the number of sub-carriers allocated to the telecommunication device and comprised in the first cluster, or is equal to the sum of the number of sub-carriers allocated to the telecommunication device and comprised in at least two clusters.

A device for determining a shifting parameter p to be used by a telecommunication device for mapping symbols on sub-carriers,

• the device for determining a shifting parameter comprising:
• circuitry configured to:
• allocate sub-carriers to the telecommunication device, the sub-carriers being grouped in at least two clusters, each cluster being separated from another cluster by at least one sub-carrier not allocated to the telecommunication device, wherein the telecommunication device includes at least two transmit antennas, the symbols being transferred through each antenna of the telecommunication device on at least an even number K, strictly greater than two, of sub-carriers allocated to the telecommunication device, the telecommunication device transferring on a first antenna of the telecommunication device during a time slot on each allocated sub-carrier ‘k’, with k=0 to K−1, a signal representing a symbol ‘Xk’ in the frequency domain, and the telecommunication device transferring on a second antenna of the telecommunication device during the time slot, on each allocated sub-carrier ‘k’, with k=0 to K−1, a signal representing a symbol ‘X′k’ derived from the signal transferred on the first transmit antenna, for each frequency k, by the formula X′ksecondAnt=ε(−1)k+1X*(p-1-k)mod K, where ε is 1 or −1, X* indicating the complex conjugate of X, p-1-k is taken modulo K, K even and p even;
• and
• determine the shifting parameter p, the shifting parameter p being determined according to clusters of sub-carriers allocated to the telecommunication device,
• wherein the circuitry determines an equidistant subcarrier which is equally distanced from a first indexed sub-carrier and a last indexed sub-carrier allocated to the telecommunication device and determines the shifting parameter p based on one of two different methods according to whether the equidistant subcarrier is or is not a sub-carrier allocated to the telecommunication device, and
• wherein if the equidistant sub-carrier is a sub-carrier allocated to the telecommunication device, the shifting parameter p is equal to the number of sub-carriers allocated to the telecommunication device and comprised in the first cluster, or is equal to the sum of the number of sub-carriers allocated to the telecommunication device and comprised in at least two clusters.