Patent ID: 8483570

Claim:
A method for efficiently increasing the capacity of a data channel being capable of operating in a given data rate B comprising: a) determining a number of N (N>1) modulated data streams to be simultaneously transmitted from a transmission end to a receiving end of said channel; b) generating said N modulated data streams, each of which having a bit rate of B/N and a bit-time of NIB; c) at said transmission end, c.1) generating a shift of 1/B*N between the first modulated data stream and each of its N−1 subsequent modulated data streams; c.2) combining said first modulated data stream and its shifted subsequent modulated data streams into a reduced bandwidth signal having up to N levels; c.3) transmitting said reduced bandwidth signal to as receiving end of said channel; d) at said receiving end, d.1) sampling said reduced bandwidth signal N times during each bit-time, thereby obtaining a vectorial stream having N elements at each time, such that each element has N+1 possible values; and d.2) equalizing the received vectorial stream to reconstruct each of said N modulated data streams.