System and method for reducing interference generated by a CDMA communications device
First Claim
1. A system for reducing interference generated by a communication device which transmits data at a variable rate and varies transmit power in response to said variable rate, said system comprising:
- means for directing said communication device to continuously transmit RF energy at a full rate power level irrespective of said variable rate when said full rate power level exceeds a predetermined threshold; and
means, in said communication device and responsive to said means for directing, for transmitting RF energy continuously at said full rate power level irrespective of said variable rate, whereby said interference is reduced proximate said communication device due to continuous transmission thereby at said full rate power level.
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Abstract
A system and method for reducing the interference experienced by sensitive electronic devices, such as hearing aids, operative in the vicinity of CDMA user communication devices. A transmitter of the communications device is configured to transmit signal power substantially continuously at a full rate power level irrespective of the variable data rate at which the transmitter would otherwise be operative. In a first embodiment, a variable rate vocoder within the transmitter is directed to perform full-rate vocoding, irrespective of an instantaneous level of user speech. In a second embodiment, a microprocessor builds full-rate frames using repeated versions of code symbols generated by the vocoder. In a third embodiment, the microprocessor builds full rate frames by generating signaling bits of a predetermined pattern to pad otherwise non-full frames.
55 Citations
41 Claims
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1. A system for reducing interference generated by a communication device which transmits data at a variable rate and varies transmit power in response to said variable rate, said system comprising:
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means for directing said communication device to continuously transmit RF energy at a full rate power level irrespective of said variable rate when said full rate power level exceeds a predetermined threshold; and means, in said communication device and responsive to said means for directing, for transmitting RF energy continuously at said full rate power level irrespective of said variable rate, whereby said interference is reduced proximate said communication device due to continuous transmission thereby at said full rate power level. - View Dependent Claims (2, 3, 4)
a variable rate vocoder;
a controller for instructing said variable rate vocoder to encode voice data at a full rate; and
a transmitter for transmitting said full rate encoded data at said full-rate power level.
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3. The system of claim 1 wherein said means for transmitting comprises:
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a controller having an input for receiving variable rate data, said controller generating full rate frames of data comprising repeated versions of said variable rate data; and
a transmitter for transmitting said full rate frames at said full rate power level.
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4. The system of claim 1 wherein said communication device nominally transmits non-full frames of data containing a variable number of bits in response to said variable rate, and wherein said means for transmitting comprises:
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a controller for generating full frames of data containing a fixed number of bits irrespective of said variable rate; and
a transmitter for transmitting said full frames of data at said full-rate power level.
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5. A method for reducing interference generated by a communication device which transmits data at a variable rate and which varies transmit power in response to said variable rate, said method comprising the steps of:
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directing said communication device to continuously transmit RF energy at a full rate power level irrespective of said variable rate when said full rate power level exceeds a predetermined threshold; and
transmitting, from said communication device and in response to said directing step, RF energy continuously at said full rate power level irrespective of said variable rate, whereby said interference is reduced proximate said communication device due to continuous transmission thereby at said full rate power level. - View Dependent Claims (6, 7, 8)
instructing a variable rate vocoder in said communication device to encode voice data at a full rate; and
transmitting said full rate encoded data at said full-rate power level.
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7. the method of claim 5 wherein said transmitting step further comprises the steps of:
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generating full rate frames of data comprising repeated versions of said variable rate data; and
transmitting said full rate frames at said full rate power level.
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8. The method of claim 5 wherein said communication device nominally transmits non-full frames of data containing a variable number of bits in response to said variable rate, and wherein said transmitting step further comprises the steps of:
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generating full frames of data containing a fixed number of bits irrespective of said variable rate; and
transmitting said full frames of data at said full-rate power level.
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9. A communication device which transmits data at a variable rate and which varies transmit power in response to said variable rate, said system comprising:
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a transmitter; and
a controller for directing said transmitter to transmit RF energy continuously at a full rate power level irrespective of said variable rate when said full rate power level exceeds a predetermined threshold, whereby said interference is reduced proximate said communication device due to continuous transmission thereby at said full rate power level. - View Dependent Claims (10, 11, 12)
a variable rate vocoder for encoding voice data at a full rate.
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11. The communication device of claim 9 wherein said controller has an input for receiving variable rate data, said controller generating full rate frames of data comprising repeated versions of said variable rate data and wherein said transmitter transmits said full rate frames at said full rate power level.
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12. The communication device of claim 9 wherein said communication device nominally transmits non-full frames of data containing a variable number of bits in response to said variable rate, and wherein said controller generates full frames of data containing a fixed number of bits irrespective of said variable rate and wherein said transmitter transmits said full frames of data at said full-rate power level.
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13. A base station in a communication system in which a plurality of communication devices each transmits data at a variable rate and each which varies transmit power in response to its respective variable rate, said base station comprising:
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means for determining if one of said plurality of communication devices is continuously transmitting RF energy at a full rate power level irrespective of a respective variable rate;
means for directing a first of said plurality of communication devices to continuously transmit RF energy at a full rate power level irrespective of said variable rate, whereby interference is reduced proximate said first communication device due to continuous transmission thereby; and
means for receiving said RF energy continuously transmitted by said first communication device.
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14. A method for reducing interference generated by a first of a plurality of communication devices each which transmits data at a variable rate and each which varies transmit power in response to its respective variable rate, said method comprising the steps of:
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directing a first of said plurality of communication devices to continuously transmit RF energy at a full rate power level irrespective of its respective variable rate when the full rate power level exceeds a predetermined threshold, whereby interference is reduced proximate said first communication device due to continuous transmission thereby; and
receiving said RF energy continuously transmitted by said first communication device. - View Dependent Claims (15)
determining whether one of said plurality of communication devices is continuously transmitting RF energy at a full rate power level irrespective of its respective variable rate.
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16. A system for reducing interference generated by a communication device which transmits data at a variable rate and which varies transmit power in response to said variable rate, said system comprising:
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a controller for directing said communication device to continuously transmit RF energy at a full rate power level irrespective of said variable rate when said full rate power level exceeds a predetermined threshold; and
a transmitter, in said communication device and responsive to said controller for directing, for transmitting RF energy continuously at said full rate power level irrespective of said variable rate, whereby said interference is reduced proximate said communication device due to continuous transmission thereby at said full rate power level.
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17. A base station in a communication system in which a plurality of communication devices transmits data at a variable rate and which varies transmit power in response to said variable rate, said base station comprising:
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a controller for directing a first of said plurality of communication devices to continuously transmit RF energy at a full rate power level irrespective of said variable rate when said full rate power level exceeds a predetermined threshold; and
a transmitter, in said communication, whereby interference is reduced proximate said first communication device due to continuous transmission thereby; and
a receiver for receiving said RF energy continuously transmitted by said first communication device.
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18. A communication device, comprising:
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a variable rate vocoder operable at a plurality of rates including a full rate and at least one rate less than the full rate; and
a transmitter having a power level associated with each of the vocoder rates, the transmitter being configured to transmit data from the variable rate vocoder at the full rate power level irrespective of the vocoder rate when said full rate power level exceeds a predetermined threshold. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for reducing interference generated by a communication device, comprising:
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operating a variable rate vocoder at one of a plurality of rates including a full rate and at least one rate less than the full rate, each of the rates having a power level associated therewith;
transmitting data from the variable rate decoder at the full rate power level irrespective of the operating rate of the variable rate vocoder when said full rate power level exceeds a predetermined threshold. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification