Adaptive interference cancellation for power line carrier communication systems

A new technique for adaptive interference cancellation is presented. It has the potential of providing cost-effective interference suppression, thereby freeing up the PLC (power line carrier) frequency band for future expansion of services. A general theory of adaptive cancellation for this application is presented with particular attention paid to several problem areas: error sensing, cancellation bandwidth, and circuit design. It is demonstrated that economical circuit designs that cover the entire PLC frequency band can be readily achieved. These low-level circuits in conjunction with existing PLC components offer a means for achieving high cross-bus attenuation at a significantly lower cost than conventional practice allows