EFFECT OF CABLE AND SYSTEM PARAMETERS ON PASSBAND ADSL PERFORMANCE

In this paper we investigate the bit error rate (BER) performance of a passband single-carrier QAM transceiver for Asymmetric Digital Subscr iber Lines (ADSL), with additive white Gaussian noise (AWGN) and self far end crosstalk (FEXT) as the main disturbances. The major differenc e with previous contributions on ADSL performance is that we present a simple approximate analytical expression for the signal to noise rati o (SNR) margin, which clearly shows the effect of various cable and sy stem parameters (such as loop length, transmit power, QAM constellatio n size, bit rate, ...) on ADSL performance. From this expression, we d etermine the optimum constellation size and the maximum achievable bit rate as a function of the loop length.