Method and system of adaptive communication in the HF band
First Claim
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1. A method for adaptive communications in a High Frequency (HF) frequency band, comprising:
- determining, at a receiver, a frequency band S that is available for a transmission by a transmitter in the HF band, depending on at least one of the following two criteria;
a number of frequencies allocated to a user included in the frequency band S according to a frequency allocation plan, anda physical availability of the frequency band S evaluated as a function of a prediction of an interference induced on a signal by reflections off ionospheric layers;
selecting, dynamically at the receiver, in the frequency band S, a set of n frequency channels of identical width according to the frequency allocation plan and according to a quality score of a link of each of said n frequency allocation channels;
determining, dynamically at the receiver, a number of frequency channels in the set of n frequency channels for which the quality score of the link is greater than a minimum threshold required for the transmission on the determined number of frequency channels,if said determined number of frequency channels having the quality score is less than a minimum number of the frequency channels required for the transmission, determining, dynamically in real time at the receiver, another available frequency band; and
communicating, from the receiver, results of said determining the number of frequency channels to the transmitter for simultaneously transmitting on the determined number of frequency channels, a signal complying with an HF waveform, if the determined number of frequency channels is equal to or more than the minimum number of the frequency channels meeting the quality score.
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Abstract
A method for adaptive communication in an HF frequency band includes at least one of the following steps: the determination of a payload subband S that is available for a transmission in the HF band, the selection in the payload subband S of a set of n frequency channels of identical width according to a frequency allocation plan and the quality of the link of each of said channels, or the simultaneous transmission on the n frequency channels of a signal complying with an HF waveform.
7 Citations
6 Claims
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1. A method for adaptive communications in a High Frequency (HF) frequency band, comprising:
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determining, at a receiver, a frequency band S that is available for a transmission by a transmitter in the HF band, depending on at least one of the following two criteria; a number of frequencies allocated to a user included in the frequency band S according to a frequency allocation plan, and a physical availability of the frequency band S evaluated as a function of a prediction of an interference induced on a signal by reflections off ionospheric layers; selecting, dynamically at the receiver, in the frequency band S, a set of n frequency channels of identical width according to the frequency allocation plan and according to a quality score of a link of each of said n frequency allocation channels; determining, dynamically at the receiver, a number of frequency channels in the set of n frequency channels for which the quality score of the link is greater than a minimum threshold required for the transmission on the determined number of frequency channels, if said determined number of frequency channels having the quality score is less than a minimum number of the frequency channels required for the transmission, determining, dynamically in real time at the receiver, another available frequency band; and communicating, from the receiver, results of said determining the number of frequency channels to the transmitter for simultaneously transmitting on the determined number of frequency channels, a signal complying with an HF waveform, if the determined number of frequency channels is equal to or more than the minimum number of the frequency channels meeting the quality score. - View Dependent Claims (2, 3, 4, 5)
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6. A High Frequency (HF) band communication system comprising at least one HF transmitter and one HF receiver adapted to transmit and receive an HF waveform signal, wherein:
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said HF receiver comprises means for determining a frequency band S that is available for a transmission by the at least one HF transmitter in the HF band, and means for selecting dynamically, in the frequency band S, a set of n frequency channels of identical width according to a frequency allocation plan and according to a quality score of a link of each of said n frequency channels and transmitting to said HF transmitter said set of n selected frequency channels, wherein said means for determining is further configured to; determine a physical availability of the frequency band S evaluated as a function of a prediction of an interference induced on a signal by reflections off ionospheric layers, determine a number of frequency channels in the set of n frequency channels for which the quality score of the link is greater than a minimum threshold required for the transmission on the determined number of frequency channels, if said determined number of frequency channels having the quality score is less than a minimum number of the frequency channels required for the transmission, determining, dynamically in real time at the receiver, another available set of frequencies in the same frequency band; and said HF transmitter comprises means for receiving the set of n selected frequency channels and simultaneously transmitting over the determined number of frequency channels a signal complying with said HF waveform, if the determined number of frequency channels is equal to or more than the minimum number of the frequency channels meeting the quality score.
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Specification