Patent ID: 7349480

Claim:
A method comprising: creating a communications line with two or more twisted copper pairs of wire in one or more binders; receiving from said two or more twisted pairs across two or more receivers physical layer signals that have been coordinated across two or more transmitters; exploiting a correlation between measured interference noise values across two or more of said receivers to reduce interference noise in the physical layer signals; and maximizing a SNR (Signal-to-Noise Ratio) in each frequency bin of one or more frequency bins across the communications line, wherein the two or more receivers and the two or more transmitters utilize a Discrete Multi-Tone architecture having the one or more frequency bins, and wherein the receiving physical-layer signals across two or more receivers is performed in a frequency domain, independently for each frequency bin of the one or more frequency bins, and further wherein the receiving physical-layer signals across two or more receivers comprises: multiplying a transmitted symbol vector, whose elements are one or more individual symbols intended for each of the two or more transmitters, with a MIMO (Multiple Input Multiple Output) pre-processing matrix, to generate multiplied transmitted vectors; sending the multiplied transmitted vectors to an IFFT (Inverse Fast Fourier Transform) for conversion into time-domain waveforms; converting a received symbol vector into frequency-domain symbols via a FFT (Fast Fourier Transform); and multiplying the frequency domain symbols with a MIMO post-processing matrix wherein the MIMO pre-processing matrix and the MIMO post-processing matrix are designed separately for each frequency bin of the one or more frequency bins.