Method and apparatus for transmitting high speed data by spectral decomposition of the signaling space
AssigneeAT&T Corp.
InventorAdrian S Matthews
Life of this patent
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Abstract
A method and apparatus of high speed multi-dimensional signaling via a modem has a processing method of utilizing prolate pulses to optimize the transmission capacity of the channel. The modem includes a process that segments the channel bandwidth and allocates the power and bit loading in relation to a measure of the noise in each spectral bin. Data are carried over a plurality of frequencies across the channel, and within each spectral bin, a plurality of orthogonal signaling dimensions.
Claims6
A method for receiving a multi-dimensional high-speed signal comprised of a plurality of bits, via a modem, comprising steps of:
- receiving a channel output having a plurality of bits where each bit is sent in a particular dimension;
- mixing signals of the received channel output with trigonometric signals;
- and
- retrieving bits in each of the particular dimensions by:
- demodulating the mixed signals in an orthogonal filter bank of low pass Eigen filters defined by a transmitted prolate pulse of the channel output;
- reverse mapping the demodulated mixed signals to recover segmented bits;
- and
- reconstructing an originally transmitted bit pattern to recreate an original signal.
A high-speed receiver for receiving a multi-dimensional high-speed signal comprised of a plurality of bits, via a modem, comprising:
- an input for receiving a channel output signal having a spectral distribution defined by a prolate pulse;
- a mixing circuitry, connected to said input, to apply trigonometric mixing signals to the channel output signal;
- a demodulation circuitry, connected to said mixing circuitry, including a plurality of orthogonal filter banks of low pass eigen filters defined by a transmitted prolate pulse of the channel output;
- and
- a reverse mapping circuitry connected to said demodulation circuitry for reconstructing an originally transmitted bit pattern to recreate an original signal.
A method of high-speed communications for achieving high spectral efficiency comprising steps of:
- dividing a transmission channel into a plurality of sub channels;
- modulating signals in each sub channel in a numbered plurality of sub transmitters using discrete prolate functions for capacity optimization;
- summing the modulated signals and transmitting the summed signals through a transmission channel subject to noise;
- recovering the individual channels in a plurality of receivers corresponding to the plurality of sub channels;
- and
- reconstructing original bits of the transmission channel by at least one demodulation technique.
Dependencies are inferred from the claim text.