Patent ID: 8223852

Claim:
A method of receiving signals comprising a plurality of sub-channels occupying different but mutually overlapping portions of frequency spectrum, comprising: separating the signals into component signals corresponding to the respective sub-channels; calculating interference estimates for at least some of said sub-channels, based on the component signals corresponding to reference ones of said sub-channels, said reference sub-channels being one or more of (a) sub-channels bearing no transmitted data, (b) sub-channels having a fixed content which can be subtracted to obtain an interference estimate and (c) sub-channels having a content which can be estimated and subtracted to obtain an interference estimate; subtracting the interference estimates from the respective component signals to produce adjusted component signals; wherein for any particular sub-channel the interference estimate therefor is calculated as a weighted sum of interference content of the component signals of some of said reference sub-channels (excluding the particular sub-channel for which the interference estimate is to be used); wherein weights for said weighted sums are selected by measuring errors in the particular sub-channel and adjusting the weights in a sense such as to tend to reduce said error.