DIGITAL COMMUNICATION SYSTEM FOR USE IN HIGH NOISE CHANNELS

摘要

A digital communications system that addresses the problems associated with communicating over channels in the presence of various noise and channel impairments. The digital communications system employs several techniques for combating the various noise and channel impairments exhibited by the channel (e.g., a PLC channel). These techniques include a spreading signal generation scheme, a matched filter template calculation scheme, a gain compensation scheme, a floating point arithmetic scheme, a hypothesis-based frame synchronization technique, a periodic noise estimation scheme, a periodic channel estimation scheme, an adaptive bit loading technique, elimination of the guard interval technique, a time diversity technique and use of a variable duration header scheme.