System and method for reducing interference generated by a digital communication device
First Claim
1. A system for reducing amplitude modulation interference in a time-division multiple access communication system having a plurality of communication devices which communicate with a base station and in which a plurality of communication channels are divided into a cycle of time intervals, said system comprising:
- means for directing a first of said plurality of communication devices to transmit an information signal to said base station over a first of said plurality of communication channels continuously throughout a predetermined at least one of said time intervals and to transmit RF energy continuously throughout a remainder of said time intervals, wherein said RF energy comprises a non-message bearing signal; and
means, in said first communication device and responsive to said means for directing, for transmitting said information signal to said base station over said first communication channel continuously throughout said predetermined at least one of said time intervals and for transmitting RF energy continuously throughout said remainder of said time intervals, whereby said interference is reduced proximate said first communication device due to continuous transmission thereby.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for reducing radio frequency interference arising in connection with pulsed transmission over time division multiplexed communication channels. In a first embodiment, a subscriber station is nominally assigned all of the slots of each frame of a first transmit channel. By transmitting RF energy substantially continuously, the subscriber station reduces interference arising from pulsed transmission. In a second embodiment, a subscriber station is nominally assigned one or more slots of each frame of a primary channel for conventional transmission of useful information, and is also instructed to continuously transmit RF energy over an auxiliary channel at times other than during the assigned primary channel slots. In this way, interference generated in the vicinity of the subscriber station is reduced due to the substantially continuous transmission of RF energy by the subscriber station. More than one subscriber station may simultaneously utilize the auxiliary channel during reduced interference mode operation.
58 Citations
56 Claims
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1. A system for reducing amplitude modulation interference in a time-division multiple access communication system having a plurality of communication devices which communicate with a base station and in which a plurality of communication channels are divided into a cycle of time intervals, said system comprising:
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means for directing a first of said plurality of communication devices to transmit an information signal to said base station over a first of said plurality of communication channels continuously throughout a predetermined at least one of said time intervals and to transmit RF energy continuously throughout a remainder of said time intervals, wherein said RF energy comprises a non-message bearing signal; and means, in said first communication device and responsive to said means for directing, for transmitting said information signal to said base station over said first communication channel continuously throughout said predetermined at least one of said time intervals and for transmitting RF energy continuously throughout said remainder of said time intervals, whereby said interference is reduced proximate said first communication device due to continuous transmission thereby. - View Dependent Claims (2, 3, 4, 5)
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6. A method for reducing amplitude modulation interference in a time-division multiple access communication system having a plurality of communication devices which communicate with a base station and in which a plurality of communication channels are divided into a cycle of time intervals, said method comprising the steps of:
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directing a first of said plurality of communication devices to transmit an information signal to said base station over a first of said plurality of communication channels continuously throughout a predetermined at least one of said time intervals and to transmit RF energy continuously throughout a remainder of said time intervals, wherein said RF energy comprises a non-message bearing signal; and transmitting, from said first communication device and in response to said directing step, said information signal to said base station over said first communication channel continuously throughout said predetermined at least one of said time intervals and RF energy continuously throughout said remainder of said time intervals, whereby said interference is reduced proximate said first communication device due to continuous transmission thereby. - View Dependent Claims (7, 8, 9, 10)
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11. A communication device operating in time-division multiple access communication system in which a plurality of communication channels are divided into a cycle of time intervals, said communication system including a base station, said communication device for reducing amplitude modulation interference comprising:
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a transmitter; and a controller for directing said transmitter to transmit an information signal to said base station over a first of said plurality of communication channels continuously throughout a predetermined at least one of said time intervals and RF energy continuously throughout a remainder of said time intervals, wherein said RF energy comprises a non-message bearing signal, whereby amplitude modulation interference is reduced proximate said communication device due to continuous transmission thereby. - View Dependent Claims (12, 13)
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14. A system for reducing amplitude modulation interference in a time-division multiple access communication system having a plurality of communication devices which communicate with a base station and in which a plurality of communication channels are time and frequency divided into a cycle of slots, said system comprising:
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means for directing a first of said plurality of communication devices to transmit an information signal to said base station continuously throughout a predetermined at least one of said slots of a first of said plurality of communication channels and to transmit RF energy continuously throughout a remainder of said slots of said first communication channel, wherein said RF energy comprises a non-message bearing signal; and means, in said first communication device and responsive to said means for directing, for transmitting said information signal to said base station continuously throughout said predetermined at least one slot of said first communication channel and to transmit RF energy continuously throughout said remainder of slots of said first communication channel, whereby said interference is reduced proximate said first communication device due to continuous transmission thereby. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A system for reducing amplitude modulation interference in a time-division multiple access communication system having a plurality of communication devices which communicate with a base station and in which a plurality of communication channels are time and frequency divided into a cycle of slots, said system comprising:
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means for directing a first of said plurality of communication devices to transmit an information signal to said base station continuously throughout a predetermined at least one of said slots of a primary communication channel of said plurality of communication channels and to transmit RF energy continuously throughout a remainder of said slots of an auxiliary communication channel of said plurality of communication channels, wherein said RF energy comprises a non-message bearing signal; and means, in said first communication device and responsive to said means for directing, for transmitting said information signal to said base station continuously throughout said predetermined at least one of said slots of said primary communication channel and to transmit RF energy continuously throughout a remainder of said slots of said auxiliary communication channel, whereby said interference is reduced proximate said first communication device due to continuous transmission thereby. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A communication device operating in a time-division multiple access communication system in which a plurality of communication channels are time and frequency divided into a cycle of slots, said communication system including a base station, said communication device for reducing amplitude modulation interference comprising:
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a transmitter; and a controller for directing said transmitter to transmit an information signal to said base station continuously throughout a predetermined at least one of said slots of a first of said plurality of communication channels and to transmit RF energy continuously throughout a remainder of said slots of said first communication channel, wherein said RF energy comprises a non-message bearing signal, whereby amplitude modulation interference is reduced proximate said communication device due to continuous transmission thereby. - View Dependent Claims (43, 44, 45, 46, 47, 48)
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49. A communication device operating in a time-division multiple access communication system in which a plurality of communication channels are time and frequency divided into a cycle of slots, said communication system including a base station, said communication device for reducing amplitude modulation interference comprising:
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a transmitter; and a controller for directing said transmitter to transmit an information signal to said base station continuously throughout a predetermined at least one of said slots of a primary communication channel of said plurality of communication channels and to transmit RF energy continuously throughout a remainder of said slots of an auxiliary communication channel of said plurality of communication channels, wherein said RF energy comprises a non-message bearing signal, whereby amplitude modulation interference is reduced proximate said communication device due to continuous transmission thereby. - View Dependent Claims (50, 51, 52, 53, 54, 55)
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56. A system for reducing amplitude modulation interference in a time-division multiple access communication system having a plurality of communication devices which communicate with a base station and in which a plurality of communication channels are time and frequency divided into a cycle of slots, said system comprising:
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means for directing a first of said plurality of communication devices to transmit an information signal to said base station continuously throughout a predetermined at least one of said slots of a primary communication channel of said plurality of communication channels and to transmit RF energy continuously throughout a remainder of said slots of an auxiliary communication channel of said plurality of communication channels; means, in said first communication device and responsive to said means for directing, for transmitting said information signal to said base station continuously throughout said predetermined at least one of said slots of said primary communication channel and to transmit RF energy continuously throughout a remainder of said slots of said auxiliary communication channel, wherein said RF energy comprises a non-message bearing signal, whereby said interference is reduced proximate said first communication device due to continuous transmission thereby; means for directing a second of said plurality of communication devices to transmit an information signal to said base station continuously throughout a predetermined at least one of said slots of one of said plurality of communication channels and to transmit RF energy continuously throughout a remainder of said slots of said auxiliary communication channel such that said RF energy transmitted from said first and second communication devices share said auxiliary communication channel; and means, in said second communication device and responsive to said means for directing, for transmitting said information signal to said base station continuously throughout said predetermined at least one slot of said one of said communication channels and to transmit RF energy continuously throughout said remainder of slots of said auxiliary communication channel, whereby said interference is reduced proximate said second communication device due to continuous transmission thereby.
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Specification