Method and apparatus for capacity increase and enhanced communications performance in CATV networks
View Patent ↗In a cable television (CATV) data communication network, channel throughput and communications robustness are increased in a manner that improves speed of data transmission while maintaining compatibility with existing specifications and equipment. Enhanced throughput can be realized using the return channel of the CATV network. Alternatively, data retransmission and/or diversity techniques can be used to improve throughput.
1. An analog front end arrangement for use in a communication system for communicating a data signal using a cable television transmission medium, comprising:
a plurality of band pass filters coupled to receive a modulated radio frequency signal, each of the band pass filters centered around a different center frequency, wherein a sampling rate is less than the Nyquist rate so as to cause aliasing deliberately;
a multiplexer coupled to receive output signals from the band pass filters and to couple a selected one of the band pass filter output signals to an output of the multiplexer;
an analog to digital converter, responsive to the output of the multiplexer and to an output of a clock signal generator and configured to provide a digital signal, generated as a function of the output of the multiplexer and the output of the clock signal generator, to a digital receiver; and
sample rate logic configured to provide, as a function of the center frequency, a select signal to the multiplexer, a rate parameter to the clock signal generator, and a spectrum inversion indication to the digital receiver.