Crosstalk-limited performance of a computationally efficient multichannel transceiver for high rate digital subscriber lines

The authors present an evaluation of the performance of a multitone IDFT-DFT (inverse discrete Fourier transform/discrete Fourier transform) transceiver for crosstalk-limited carrier serving area (CSA) subscriber loops. The transceiver is computationally efficient and can provide reliable T1 transmission in the presence of crosstalk noise. The authors examine the effects of signaling rate, block length, use of trellis code, transmit bandwidth optimization, transmitter power, and inclusion of crosstalk noise margin on channel throughput. It is concluded that the IDFT-DFT transceiver of block length 512, signaling at 640 kbaud, with 10 mW input power, and using a powerful 5.5 dB trellis code can provide 1.544 Mb/s T1 carrier service on a significant portion of CSA local loops that are limited by crosstalk noise