초록 ▼

A power line communication system specially designed for use in local area network (LAN) configurations has receiver and transmitter sections for fast, highly reliable data communication. The receiver includes controlled adaptive second order filters for ensuring data reception in virtually any sign

A power line communication system specially designed for use in local area network (LAN) configurations has receiver and transmitter sections for fast, highly reliable data communication. The receiver includes controlled adaptive second order filters for ensuring data reception in virtually any signal environment having noise and distortion characteristics, especially alternating current (AC) power lines. A wideband phase shift-keyed (PSK) carrier is impressed on the transmission medium, the carrier having power spread approximately uniformly across a useful frequency bandwidth. A transmitter section is arranged for adaptive feedback control of the transmitted signal power, so as to prevent possible damage to the transmitter when the transmission medium impedance is low. A logic control circuit provides a correlation count of a received signal in comparison with a known reference signal in order to effectively achieve phase synchronization between the receiver and transmitter.

대표청구항 ▼

A data communication system for communicating a data signal between a first location and a second location over a line having at least a first conductor and a second conductor, the system comprising, at each location: means for deriving from said line a received wideband signal having power distribu

A data communication system for communicating a data signal between a first location and a second location over a line having at least a first conductor and a second conductor, the system comprising, at each location: means for deriving from said line a received wideband signal having power distributed substantially uniformly over a predetermined frequency bandwidth; means responsive to a first control signal for adaptively filtering said received wideband signal to reduce distortion and noise components of said received signal so that said received signal is thereby substantially equalized; means for converting said substantially equalized received signal into a periodic serial output stream of binary bits; means for comparing each of a number of successively received groups of bits in said stream of binary bits to a reference signal at a number of different relative phases; means responsive to said comparing means for generating a number of count values representing degrees of correlation between each of said groups of bits and said reference signal; means for identifying a series of groups of bits whose count values match a predetermined pattern of count values; and means for generating said first control signal in response to an absence of a matching series of count values for a predetermined period of time.