GEN01-4: Analysis of Timing Recovery for DMT Systems Over Indoor Power-Line Channels

Discrete multitone (DMT) modulation is a suitable technique to cope with main impairments of broadband indoor power-line channels: spectral selectivity and cyclic time variations. To attain higher bit rates, in those subbands with good transmission conditions a high number of bits per symbol must be allocated and, hence, synchronization issues become an important concern. This paper analyzes the performance of a conventional DMT timing recovery scheme designed for linear time-invariant (LTI) channels, like digital subscriber lines, when employed over indoor power-lines. The influence of the channel short-time variations and the sampling jitter on the synchronization scheme performance is assessed. Proper parameterization of the timing recovery scheme is provided on the basis of reducing the impact of channel time variations while maintaining the ability to track the sampling jitter.