Patent ID: 8462860

Claim:
A method comprising: receiving by a receiver a signal comprising N first sub-carriers and M second sub-carriers; wherein N≧2, M≧1, the N first sub-carriers are received over a set of frequencies and over a T seconds time interval, the M second sub-carriers are received over at least some of the set of frequencies and, at least partially, over the T seconds time interval, the N first sub-carriers are orthogonal therebetween, the M second sub-carriers are orthogonal therebetween when M>1 and wherein at least one of the M second sub-carriers is not orthogonal to at least one of the N first sub-carriers; processing the N first sub-carriers and the M second sub-carriers jointly at the receiver to reduce interference from the N first sub-carriers into the M second subcarriers and/or from the M second sub-carriers into the N first sub-carriers; and deriving data responsive to said jointly processing, wherein a spacing between two adjacent sub-carriers of the N first sub-carriers is 1/T Hz, a spacing between two adjacent sub-carriers of the M second sub-carriers is 1/T Hz and a spacing between a first sub-carrier of the N first sub-carriers and a sub-carrier of the M second sub-carriers that is adjacent to the first sub-carrier of the N first sub-carriers is less than 1/T Hz.