Cost-effective echo and NEXT canceller designs for 10GBASE-T ethernet system

In this paper, new echo and NEXT cancellers are proposed for echo and NEXT cancellation in full-duplex digital transmission over 10GBASE-T system. The proposed cancellation schemes inherit the concept of the adaptive interpolated FIR (AIFIR)-based crosstalk canceller, where the long portion is modeled by an adaptive sparse FIR filter. Furthermore, we also employ the channel shortening technique to shorten the impulse response of crosstalk interference. Hence, the complexity of echo and NEXT cancellers can be greatly reduced. Simulations show that compared with the conventional architecture, although the performance is degraded by 1.5 dB, it still meets the SNR requirement in 10GBASE-T system. The complexity reduction of the proposed echo and NEXT cancellation schemes in arithmetic is about 70% and 65% respectively. The saving of hardware complexity results in computationally efficient VLSI implementation of the echo and NEXT cancellers in 10GBASE-T system.