Device and method for combining precoding with symbol-rate spectral shaping
First Claim
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1. A device for providing symbol-rate transmit spectral shaping of a digital information sequence in a digital transmission system, comprising at least one of:
- modulation means for at least modulating the digital information sequence; and
demodulation means for at least demodulating the modulated digital information sequence to provide an estimate of the digital information sequence;
wherein;
the modulation means comprises at least;
a precoding means operably coupled to receive the digital information sequence, for precoding said sequence utilizing a predetermined monic equivalent channel response h(D) to generate a precoded sequence;
a symbol-rate spectral shaping means with a monic filter response a(D)≠
1, operably coupled to the precoding means, for utilizing a spectral shaping filtering function and a first scaling factor to provide a spectrally shaped sequence of precoded symbols; and
a transmission preparation means operably coupled to the symbol-rate spectral shaping means, for generating a spectrally-shaped transmission sequence for transmission on a selected channel;
and the demodulation means comprises at least;
an equalizing means operably coupled to receive the spectrally-shaped transmission sequence, for providing an equalized spectrally-shaped sequence of precoded symbols; and
a symbol-rate processing means, operably coupled to the equalizing means, comprising;
noise prediction means, operably coupled to receive the equalized spectrally-shaped sequence of precoded symbols, for substantially utilizing a symbol-rate noise prediction filter with response b(D)=h(D)/a(D) and at least a second scaling factor to provide a noise prediction filter output; and
decoding means, operably coupled to the symbol-rate noise prediction means, for providing an estimate of the digital information sequence.
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Abstract
The device and method provide precoding and symbol-rate transmitter spectral shaping of signals representative of digital information. The invention improves reliability of reception in the presence of non-Gaussian channel noise. The present invention also provides a flexible way of choosing between linear equalization, precoding without spectral shaping, and precoding with spectral shaping.
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Citations
22 Claims
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1. A device for providing symbol-rate transmit spectral shaping of a digital information sequence in a digital transmission system, comprising at least one of:
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modulation means for at least modulating the digital information sequence; and demodulation means for at least demodulating the modulated digital information sequence to provide an estimate of the digital information sequence;
wherein;the modulation means comprises at least; a precoding means operably coupled to receive the digital information sequence, for precoding said sequence utilizing a predetermined monic equivalent channel response h(D) to generate a precoded sequence; a symbol-rate spectral shaping means with a monic filter response a(D)≠
1, operably coupled to the precoding means, for utilizing a spectral shaping filtering function and a first scaling factor to provide a spectrally shaped sequence of precoded symbols; anda transmission preparation means operably coupled to the symbol-rate spectral shaping means, for generating a spectrally-shaped transmission sequence for transmission on a selected channel; and the demodulation means comprises at least; an equalizing means operably coupled to receive the spectrally-shaped transmission sequence, for providing an equalized spectrally-shaped sequence of precoded symbols; and a symbol-rate processing means, operably coupled to the equalizing means, comprising; noise prediction means, operably coupled to receive the equalized spectrally-shaped sequence of precoded symbols, for substantially utilizing a symbol-rate noise prediction filter with response b(D)=h(D)/a(D) and at least a second scaling factor to provide a noise prediction filter output; and decoding means, operably coupled to the symbol-rate noise prediction means, for providing an estimate of the digital information sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device in a modem for providing symbol-rate transmit spectral shaping of a digital information sequence in a digital transmission system, comprising at least:
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modulation means for at least modulating the digital information sequence; and demodulation means for at least demodulating the modulated digital information sequence to provide an estimate of the digital information sequence; wherein; the modulation means comprises at least; a precoding means operably coupled to receive the digital information sequence for precoding said sequence utilizing a predetermined monic equivalent channel response h(D) to generate a precoded sequence; a symbol-rate spectral shaping means with a monic filter response a(D)≠
1, operably coupled to and responsive to the precoding means, for utilizing a spectral shaping filtering function and a first scaling factor to provide a spectrally shaped sequence of precoded symbols; anda transmission preparation means operably coupled to and responsive to the symbol-rate spectral shaping means, for generating a spectrally-shaped transmission sequence for transmission on a selected channel; and the demodulation means comprises at least; an equalizing means operably coupled to receive the spectrally-shaped transmission sequence, being responsive to the transmission preparation means, for providing an equalized spectrally-shaped sequence of precoded symbols; and a symbol-rate processing means, operably coupled to and responsive to the equalizing means, comprising; noise prediction means, responsive to the equalizing means, being operably coupled to receive the equalized spectrally-shaped sequence of precoded symbols for substantially utilizing a symbol-rate noise prediction filter with response b(D)=h(D)/a(D) and at least a second scaling factor to provide a noise prediction filter output; and decoding means, operably coupled to and responsive to the symbol-rate noise prediction means, for providing an estimate of the digital information sequence. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for providing symbol-rate transmit spectral shaping of a digital information sequence in a digital transmission system, comprising at least one of the sets of steps:
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(A) precoding the digital information sequence utilizing a predetermined monic equivalent channel response h(D) to generate a precoded sequence; utilizing a symbol-rate spectral shaping filter with a monic filter response a(D)≠
1, and a first scaling factor to provide a spectrally shaped sequence of precoded symbols;generating a spectrally-shaped sequence for transmission on a selected channel; and (B) utilizing an equalization unit to provide an equalized spectrally-shaped sequence of said precoded symbols; and utilizing a symbol-rate noise prediction filter with response b(D)=h(D)/a(D) and at least a second scaling factor to provide a noise prediction filter output, and providing an estimate of the digital information sequence. - View Dependent Claims (19, 20, 21, 22)
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Specification