Patent ID: 9077516
Filing Date: 2015-07-07
Classification: H04L

Abstract:
1. A method comprising: determining a respective set of equalization filters for respective equalization of at least first and second sub-carrier channels of each of at least two sets of sub-carrier channels of a frequency-selective transmission channel, wherein said frequency-selective transmission channel has M wherein said frequency-selective transmission channel can be represented in a transformation domain based on N orthogonal sub-carriers, and wherein transmission characteristics, from said M wherein the at least two sets of sub-carrier channels each comprise at least a first sub-carrier channel and a second sub-carrier channel of said N sub-carrier channels and wherein allocation of subcarrier channels is regulated so as to ensure that a number of sub-carrier channels in each of said at least two sets of sub-carrier channels is not equal to the number of subcarrier channels in any other sets of subcarrier channels, wherein for each of said at least two sets of sub-carrier channels, the respective set of equalization filters for respective equalization of said at least said first and second sub-carrier channels is determined based on a representation of at least the first sub-carrier channel of each of said at least two sets of sub-carrier channels, wherein the set of equalization filters comprises at least a first equalization filter, of a first type, for equalization of the first sub-carrier channel and a second equalization filter, of a second type, for equalization of the second sub-carrier channel, and wherein the second equalization filter is configured to perform signal adjustment equal to that of the first equalization filter and to include at least one transmit weight vector equal to a corresponding transmit weight vector of the first equalization filter; and performing respective equalization on the at least first and second sub-carrier channels of each of the at least two sets of subcarrier channels of the frequency-selective transmission channel using the set of equalization filters, wherein the equalization is performed approximately simultaneously on different sub-carrier channels of the at least first and second sub-carrier channels of each of the at least two sets of subcarrier channels by the first and second equalization filters.