Rate adaptation and parameter optimization for multi-band single carrier transmission
First Claim
1. A method for multi-band, bidirectional data communication over a non-ideal channel using a single CAP/QAM carrier per band, comprising:
- defining an adjustable center frequency and constellation size for each of said multiple bands;
defining a total target bit rate for said multiple bands;
defining a margin requirement for each of said multiple bands;
evaluating a response characteristic of each of said multiple bands; and
varying the adjustable center frequency and constellation size for defining a combination of an optimum center frequency and an optimum constellation size at which bit rate and/or margin is enhanced in accordance with said response characteristic.
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Abstract
A method for enhancing the bit rate and/or margin at which quadrature amplitude modulation (QAM) communication is performed over multiple bands of a communication link includes the steps of varying a spectral allocation and constellation size with which communication is performed, so as to define a combination of spectral allocation and constellation size at which the bit rate and/or margin are enhanced. The rate adaptation method identifies the spectral allocation and constellation size to use on each of the multiple bands that results in a total bit rate greater than or equal to the target bit rate, subject to specified constraints on SNR margin and/or BER limits. If more than one parameter set has this property, the rate adaptation method may for example select the spectral allocation and constellation size combination that maximizes the minimum SNR margin across the multiple bands.
60 Citations
24 Claims
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1. A method for multi-band, bidirectional data communication over a non-ideal channel using a single CAP/QAM carrier per band, comprising:
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defining an adjustable center frequency and constellation size for each of said multiple bands; defining a total target bit rate for said multiple bands; defining a margin requirement for each of said multiple bands; evaluating a response characteristic of each of said multiple bands; and varying the adjustable center frequency and constellation size for defining a combination of an optimum center frequency and an optimum constellation size at which bit rate and/or margin is enhanced in accordance with said response characteristic. - View Dependent Claims (2, 3, 4)
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5. A method for multi-band, bidirectional data communication over a non-ideal channel using a single CAP/QAM carrier per band, comprising:
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evaluating a response characteristic of each of said multiple bands with respect to a parametric set; varying said parametric set by varying a constellation vector including an adjustable center frequency and an adjustable constellation size to increase a signal-noise-ratio margin without falling below a total target bit rate for said multiple bands; re-evaluating the response characteristic of each of the multiple bands with respect to said varied parametric set; and defining an optimal parametric set for which the response characteristic allows optimization of at least one of said constellation vector and signal-noise-ratio margin. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method for multi-band, bidirectional data communication over a non-ideal transmission channel using a single CAP/QAM carrier per band, comprising:
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defining an adjustable center frequency for each of said multiple bands; evaluating a response characteristic of each of said multiple bands with respect to said adjustable center frequencies; determining a maximum constellation size for each of said adjustable center frequencies in accordance with said response characteristic; determining total bit rate delivered for each of said adjustable center frequencies and maximum constellation sizes; varying said maximum constellation sizes to increase signal-noise-ratio margin without falling below a total target bit rate; and defining an optimal center frequency and constellation size in accordance with at least one of said constellation size and signal-noise-ratio margin.
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12. A method for multi-band, bidirectional data communication over a non-ideal transmission channel using a single CAP/QAM carrier per band, comprising:
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defining an adjustable center frequency for each of said multiple bands; evaluating a response characteristic of each of said multiple bands with respect to said adjustable center frequency; determining a maximum constellation size for said adjustable center frequency of each of said multiple bands in accordance with said response characteristic; determining total bit rate delivered for each of said adjustable center frequencies and maximum constellation sizes; and defining an optimal center frequency and constellation size at which bit rate and/or noise margin is enhanced in accordance with said total bit rate. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for enhancing a bit rate and/or margin at which communication is performed over multiple bands within a communication link, the method comprising the steps of:
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defining a plurality of adjustable center frequencies for each band within said link, wherein each adjustable center frequency relates to a single QAM channel; and defining an optimum combination of one of the defined adjustable center frequencies and a constellation size at which total bit rate and/or margin across said multiple bands is enhanced, wherein each constellation size relates to a single QAM channel. - View Dependent Claims (19)
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20. A transceiver for bi-directional communication over a multi-band communication link, comprising
a transmit spectrum control circuit for varying an adjustable center frequency with which encoding is performed on said multiple bands; - and
a transmit constellation size control circuit for varying a constellation size with which encoding is performed on said multiple bands, wherein the transmit spectrum control and transmit constellation size control circuits cooperate to define a combination of center frequency and constellation size at which total bit rate and/or margin is enhanced over said multiple bands. - View Dependent Claims (21, 22, 23, 24)
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Specification