Computationally efficient cancellation of partially-overlapped crosstalk in digital subscriber lines

Abstract

We consider the crosstalk cancellation problem when the transmit and receive signal spectrum are partially overlapped with each other in the frequency domain. In this case, the use of conventional crosstalk cancellers may not be practical due to the computational complexity. When the overlapped bandwidth of the crosstalk signal is less than the bandwidth of the transmit signal, the crosstalk cancellation can be realized efficiently by processing in the baseband. The use of interpolation and decimation processing in the baseband makes it possible to realize the crosstalk canceller with low computational complexity. The proposed scheme can provide crosstalk cancellation performance comparable to the conventional one, while requiring the computational complexity less than one half the conventional one.