Patent ID: 6118758
Filing Date: 2000-09-12
Classification: H04L

Abstract:
In a multi-point communications system comprising a receiver and transmitter disposed at a primary site for communication with a plurality of remote service units disposed at respective secondary sites, the receiver of the primary site receiving an analog signal comprising a first carrier signal having a first frequency and carrying a first subsymbol and a second carrier signal having a second frequency and carrying a second subsymbol, a transmitter for use in at least one of said remote service units comprising:a source of digital first data and digital second data;a digital signal generator responsive to the first data to generate a digital form of said first carrier signal carrying said first subsymbol and responsive to the second data to generate a digital form of said second carrier signal carrying said second subsymbol, said digital signal generator generating said digital form of said first carrier signal and said second carrier signal by generating and combining a time domain sequence of signals; anda converter connected to convert the digital form of said first carrier signal and said second carrier signal into said analog signal for transmission to the receiver of the primary site.