Spread spectrum digital data communication overlay system and method
First Claim
1. A digital data communication overlay system that is overlaid on a predefined frequency band of an existing analog data communication system, the digital data communication overlay system comprising:
- a first digital data communication unit and a second digital data communication unit;
wherein the first and second digital data communication units each have an antenna and are configured to transmit and receive spread spectrum digital data communication signals between each other over a spread spectrum digital data communication channel in which the spread spectrum digital data communication signals are spread over the predefined frequency spectrum using a frequency hopping spread spectrum (FHSS) code including a plurality of hop frequency bands and wherein each of the first and second digital data communication units independently sequentially monitor the digital data communication channel at a selected hop frequency band of the plurality of hop frequency bands to detect AM communication signals received at its antenna immediately prior to transmitting from its antenna in the selected hop frequency band, and the first digital data communication unit is configured to suppress transmission of the spread spectrum digital data communication signals in hop frequency bands in which the first digital data communication unit detects the AM communication signals from the existing analog data communication system.
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Abstract
A digital data communication overlay system is disclosed which is overlaid on a predefined frequency band of an existing analog data communication system. The digital data communication overlay system comprises a digital mobile unit and a digital ground station. The digital mobile unit and the digital ground station are configured to transmit and receive spread spectrum digital data communication signals between each other over the same spread spectrum digital channel. This is done by spreading the spread spectrum digital data communication signals over the predefined frequency spectrum of the existing analog data communication system.
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Citations
30 Claims
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1. A digital data communication overlay system that is overlaid on a predefined frequency band of an existing analog data communication system, the digital data communication overlay system comprising:
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a first digital data communication unit and a second digital data communication unit;
wherein the first and second digital data communication units each have an antenna and are configured to transmit and receive spread spectrum digital data communication signals between each other over a spread spectrum digital data communication channel in which the spread spectrum digital data communication signals are spread over the predefined frequency spectrum using a frequency hopping spread spectrum (FHSS) code including a plurality of hop frequency bands and wherein each of the first and second digital data communication units independently sequentially monitor the digital data communication channel at a selected hop frequency band of the plurality of hop frequency bands to detect AM communication signals received at its antenna immediately prior to transmitting from its antenna in the selected hop frequency band, and the first digital data communication unit is configured to suppress transmission of the spread spectrum digital data communication signals in hop frequency bands in which the first digital data communication unit detects the AM communication signals from the existing analog data communication system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of overlaying a digital data communication overlay system on a predefined frequency band of an existing analog data communication system, the method comprising:
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transmitting and receiving spread spectrum digital data communication signals between a first and a second digital data communication unit, each having a respective antenna, over a spread spectrum digital data communication channel in which the spread spectrum digital data communication signals are spread over the predefined frequency spectrum using a frequency hopping spread spectrum (FHSS) code including a plurality of hop frequency bands;
monitoring, with the first digital data communication unit, the digital data communication channel at a selected hop frequency band of the plurality of hop frequency bands to detect AM communication signals received at its antenna immediately prior to transmitting from its antenna in the selected hop frequency band; and
suppressing transmission by the first digital communication unit of the spread spectrum digital data communication signals in the selected hop frequency bands if AM communication signals from the existing analog data communication system are detected in the selected hop frequency band by the first digital communication unit. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification