NEXT cancellation for modem pools

Abstract

A method of NEXT cancellation in a modem pool having a plurality of modems, where each modem has at least one FIR filter, each FIR filter for filtering signals from a transmitting one of the modems, each modem transmitting a signal having a plurality of contiguous signal blocks, the method including providing a frequency response vector per FIR filter, for each corresponding one of the transmitted signal blocks for each of the modems adapting the length of the signal block to equal the length of the frequency response vector, transforming the adapted signal block into the frequency domain, thereby generating a frequency-domain signal vector, for each of the modems and its at least one FIR filter multiplying the frequency response vector of the FIR filter by a corresponding one of the frequency-domain signal vectors, thereby generating a filtered frequency-domain signal vector, adding the filtered frequency-domain signal vectors, thereby generating a combined filtered frequency-domain signal vector, transforming the combined filtered frequency-domain signal vector into the time domain, thereby generating a combined filtered time-domain signal vector, adapting the length of the combined filtered time-domain signal vector, and subtracting the adapted combined filtered time-domain signal vector from a received signal block generally corresponding in time to the transmitted signal block, thereby resulting in a received signal block from which NEXT has been at least partially cancelled.

Dependencies are inferred from the claim text.