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US 2010/0150211 A1Published application
Orthogonal Code Division Multiplexing for Twisted Pair Channels
AssigneeAT&T Intellectual Property II, L.P.
InventorsDiakoumis Parissis Gerakoulis, Evaggelos Geraniotis
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Abstract
A plurality of data signals are separated into parallel bit streams with each parallel stream having a bandwidth characteristic such that the combined cumulative effect of all the individual bandwidths produces a spectral characteristic of the data signals that match the spectral high speed data characteristic of a twisted pair
Claims10
A method for developing a signal adapted for transmission over a twisted pair wire comprising the steps of:
- accepting an incoming data flow from a plurality of sources where each of the sources Si, i=1, 2, . . . K, provides symbols at rate Ri that is a multiple of rate Rs;
- splitting each flow Si into a number of parallel streams such that each of the parallel streams has a symbols rate of Rs, forming a total number of N streams from the splitting of all flows Si;
- spreading each of the N streams with a different spreading code from an orthogonal code set on N codes;
- combining the spread signals;
- modifying output signal that results from said combining by overspreading said output signal to form an overspread signal;
- and
- shaping said overspread signal to match power spectrum of the shaped signal to power transfer function of said twisted pair wire.
4 more elements
A method for developing a signal adapted for transmission over a twisted pair wire comprising the steps of:
- accepting an incoming plurality of flows Si, i=1, 2, . . . M , each having a data rate Ri;
- splitting a signal that is related to each flow Si into a set of Ni parallel streams, sij, j=1, 2, . . . Ni, such that each of the parallel streams has a symbols rate of Rs;
- relative to each of set i of Ni parallel streams, sij, spreading each stream sij, j=1,2, . . . Ni, with orthogonal code Wj taken from a set of orthogonal code Wm, m=1,2, . . . NM, and summing the spread streams to form a summed output stream Ki that has a rate of Rc;
- modifying output stream Ki for at least some values of i by overspreading Ki to form an overspread signal;
- and
- adding the overspread streams Ki to form said signal adapted for transmission.
3 more elements
Dependencies are inferred from the claim text.