Patent ID: 7327765

Claim:
A backwards-compatible home phone line network transmitter for communicating over a home network that supports both new version devices and old version devices, the backwards-compatible home phone line network transmitter comprising: digital processing circuitry for producing data bits corresponding to home networking frames for transmission over the home network; a baseband encoder that constellation encodes the data bits corresponding to the home networking frames to form a digitally modulated signal; a transmit filter coupled to receive the digitally modulated signal, the transmit filter transmit filtering the digitally modulated signal to produce a transmit signal, wherein the transmit signal has a sloping power spectral density (PSD) that meets signal format requirements of both an old version signal and a new version signal, wherein the sloping PSD of the transmit signal produced by the transmit filter slopes downward as frequency increases in a new version frequency band, wherein the new version frequency band is wider than and overlays an old version frequency band.