Patent ID: 6985715
Filing Date: 2006-01-10
Classification: H04B,H04L

Abstract:
1. A power line communications (PLC) modem for translating a broadband radio frequency (RF) output signal used for the transmission of communication data in broadband communications using power lines as a communication medium so as to avoid frequencies associated with interfering signals, said modem comprising: a modulator, responsive to communication data, for generating a modulated signal that is modulated by said communication data; a first filter, responsive to the modulated signal, for providing a first filtered modulated signal; a first multiplier, responsive to the first filtered modulated signal and to a first oscillator signal, for generating a first mixed signal based upon mixing the first filtered modulated signal and the first oscillator signal; a second filter, responsive to the first mixed signal, for providing a filtered first mixed signal; a second oscillator signal having a selectable operating frequency over an operating frequency range; a second multiplier, operatively connected to the second filter and responsive to the second oscillator signal, for generating a second mixed signal based upon mixing the filtered first mixed signal and the second oscillator signal; a radio-frequency filter, responsive to the second mixed signal, for providing a filtered broadband RF output signal; and means, operatively connected to the RF filter, for coupling the filtered broadband RF output signal to at least one of the power lines; whereby the broadband RF output signal has a selectable operating frequency so as to be able to avoid frequencies associated with interfering signals.