Device and method for on-line adaptive selection of baud rate and carrier frequency
First Claim
1. A device for at least receiving at least a single-carrier modulated signal transmitted from a remote device utilizing at least one baud/carrier frequency over at least a first communication channel, comprising at least:
- (A) a receiving means, operably coupled at least to the first communication channel, for receiving the single-carrier modulated signal transmitted by the remote device over any one of a plurality of frequency bands;
(B) a filtering means, operably coupled to the receiving means, for at least providing a demodulated equalized received signal;
(C) an output symbol determiner, operably coupled to the filtering means, for at least determining output symbols for the equalized received modulated signal;
(D) a spectrum analyzing means, operably coupled to the filtering means and to the output symbol determiner, for at least utilizing the demodulated equalized received modulated signal and the output symbols for estimating at least one of a signal-to-noise ratio (SNR) spectrum and a noise power spectrum; and
(E) a baud rate/carrier decision selecting means, operably coupled at least to the spectrum analyzing means, for utilizing information from the spectrum analyzing means for estimating at least one of;
decoder signal-to-noise ratios (SNRs), maximum supported bit rates, and SNRs at band edges for at least some of the available baud rate and carrier frequency combinations to select adaptively a desired baud rate and carrier frequency selection in a data communication channel.
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Accused Products
Abstract
Optimal baud rate and carrier frequency for data transmission using a modem on a communication channel (100) are determined by utilizing an on-line line probing technique. The technique utilizing the information from a decoder noise power spectrum estimated from the equalized received modulated signals and decoder output symbols to determine the decoder signal-to-noise ratios (SNRs) and supported bit rates for the available baud rates and carrier frequencies. These SNRs and bit rates together with a band edge SNR difference at each frequency band are utilized to select (110) the optimal baud rate and carrier frequency.
163 Citations
42 Claims
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1. A device for at least receiving at least a single-carrier modulated signal transmitted from a remote device utilizing at least one baud/carrier frequency over at least a first communication channel, comprising at least:
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(A) a receiving means, operably coupled at least to the first communication channel, for receiving the single-carrier modulated signal transmitted by the remote device over any one of a plurality of frequency bands; (B) a filtering means, operably coupled to the receiving means, for at least providing a demodulated equalized received signal; (C) an output symbol determiner, operably coupled to the filtering means, for at least determining output symbols for the equalized received modulated signal; (D) a spectrum analyzing means, operably coupled to the filtering means and to the output symbol determiner, for at least utilizing the demodulated equalized received modulated signal and the output symbols for estimating at least one of a signal-to-noise ratio (SNR) spectrum and a noise power spectrum; and (E) a baud rate/carrier decision selecting means, operably coupled at least to the spectrum analyzing means, for utilizing information from the spectrum analyzing means for estimating at least one of;
decoder signal-to-noise ratios (SNRs), maximum supported bit rates, and SNRs at band edges for at least some of the available baud rate and carrier frequency combinations to select adaptively a desired baud rate and carrier frequency selection in a data communication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device capable of being utilized in a modem that is capable of utilizing at least one baud rate/carrier frequency in a receiver, for at least receiving at least a single carrier modulated signal for information transmitted from a remote device, over at least a first communication channel, comprising at least:
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(A) a receiving means, operably coupled at least to the first communication channel, for receiving a single carrier modulated signal and for receiving a training signal transmitted by the remote device over any one of a plurality of frequency bands; (B) a filtering means, operably coupled to the receiving means, for at least providing a demodulated equalized received signal; (C) an output symbol determiner, operably coupled to the filtering means, for at least determining output symbols for the equalized received modulated signal; (D) a spectrum analyzing means, operably coupled to the filtering means and to the output symbol determiner, for at least utilizing the equalized received modulated signals and the output symbols for estimating at least one of a signal-to-noise ratio (SNR) spectrum and a noise power spectrum; and (E) a baud rate/carrier decision selecting means, operably coupled at least to the spectrum analyzing means, for utilizing information from the spectrum analyzing means for estimating at least one of;
decoder signal-to-noise ratios (SNRs), maximum supported bit rates, and SNRs at band edges for at least some of the available baud rate and carrier frequency combinations to select adaptively a desired baud rate and carrier frequency selection for the first communication channel. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for selecting a baud rate and carrier frequency in a system in which a local device communicates with a remote device over a first communication channel utilizing single carrier modulation, wherein the local device and the remote device are single-carrier modulated for a system capable of at least receiving the first modulated signal over any one of a first plurality of frequency bands, comprising the steps of:
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(A) sending a training signal from the remote device to a local device over the first communication channel; (B) receiving the training signal in the local device; (C) determining information for estimating at least one of;
signal-to-noise ratio (SNR) spectrum and noise power spectrum for the first communication channel based upon the received training signal and output symbols from an output symbol determiner; and(D) adaptively selecting one of the first plurality of frequency bands based upon the information for estimating the SNR spectrum for the first communication channel, said selected one of the first plurality of frequency bands to be communicated to the remote device as a desired band for further transmission to the device. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A method for selecting a communication baud rate and carrier frequency in a system in which a local device communicates with a remote device over a first communication channel in the form of a first single carrier modulated signal, the system being capable of at least receiving the first modulated signal at any one of a first plurality of bit rates, comprising the steps of:
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(A) sending a training signal from the remote device to the local device over the first communication channel; (B) receiving the training signal in the local device; (C) determining information for estimating at least one of;
signal-to-noise (SNR) spectrum and noise power spectrum for the first communication channel based upon the received training signal and the output symbols from the output symbol determiner; and(D) selecting one of the first plurality of bit rates based upon the information for estimating the SNR spectrum for the first communication channel, said selected one of the first plurality of bit rates to be communicated to the remote device as a desired bit rate for further transmission to the device. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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Specification