Automatic channel selection
First Claim
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1. In a communication system of a type that includes n channels each of which is subject to propagation anomalies and/or interference, said channels being arranged into m groups of p channels each, wherein n =m×
- p, a method of selecting a channel for the transmission of a data signal between near and far ends of a communications link, said channel having characteristics which maximize the probability of successful transmission of data, comprising the steps of;
(a) at the near end of said transmission system, continuously measuring the ambient energy levels of each of the p channels in the first one of said m groups to determine which of said p channels has the least ambient energy level;
(b) re-iterating said measuring step for each of the remaining (m-1) groups;
(c) selecting a given one of said channels with the least ambient energy levels as the most likely channel to maximize the probability of successful data transmission; and
then(d) transmitting a test message to the far end of said system over said selected channel.
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Abstract
HF and VHF radio channels which are subject to time-varying propagation aalies and to interference are arranged in groups according to frequency band. Within each group are several channels, each spaced sufficiently close so that they experience essentially the same propagation. The several channels in each group are continuously measured to find which channels have the least ambient energy levels, then one of those channels is selected in a random manner to transmit data.
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Citations
13 Claims
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1. In a communication system of a type that includes n channels each of which is subject to propagation anomalies and/or interference, said channels being arranged into m groups of p channels each, wherein n =m×
- p, a method of selecting a channel for the transmission of a data signal between near and far ends of a communications link, said channel having characteristics which maximize the probability of successful transmission of data, comprising the steps of;
(a) at the near end of said transmission system, continuously measuring the ambient energy levels of each of the p channels in the first one of said m groups to determine which of said p channels has the least ambient energy level; (b) re-iterating said measuring step for each of the remaining (m-1) groups; (c) selecting a given one of said channels with the least ambient energy levels as the most likely channel to maximize the probability of successful data transmission; and
then(d) transmitting a test message to the far end of said system over said selected channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- p, a method of selecting a channel for the transmission of a data signal between near and far ends of a communications link, said channel having characteristics which maximize the probability of successful transmission of data, comprising the steps of;
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9. In a transmission system of a kind that includes n channels each of which is subject to propagation anomalies and interference, said channels being arranged into m groups of p channels each, wherein n=m ×
- p, apparatus for selecting a channel for the transmission of a data signal between near and far ends of a telecommunication link, said channel having characteristics which maximize the probability of successful data transmission, which comprises;
means for supplying input signals to each of said n channels; means for continuously measuring the ambient energy levels of each of said channels; means for continuously selecting within each of said m groups, the channel having the least ambient energy level and for randomly selecting one channel from the m channels having the least energy levels; and means for transmitting a test signal to the far end of the system over said one selected channel. - View Dependent Claims (10, 11, 12, 13)
- p, apparatus for selecting a channel for the transmission of a data signal between near and far ends of a telecommunication link, said channel having characteristics which maximize the probability of successful data transmission, which comprises;
Specification