Programmable modem apparatus for transmitting and receiving digital data, design method and use method for the modem
First Claim
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1. A method for transmitting spread spectrum signals, comprising:
- dividing an input data signal among a plurality of parallel segments of transmission data;
spreading each of the plurality of parallel segments to form parallel spread signals using orthogonal or semi-orthogonal PN codes;
summing the parallel spread signals to generate a sum signal;
digitally filtering the sum signal to generate a baseband signal;
converting the baseband signal to an intermediate frequency signal; and
transmitting the intermediate frequency signal.
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Abstract
The programmable modem for digital data of the present invention provides a highly programmable, digital modem implemented in an integrated circuit which can be customized to specific applications. The programmable modem uses spread spectrum techniques and is specifically programmable to alter the parameters of the modem to improve performance. The present invention also provides a systematic method and development kit to provide rapid customization of a modem for a particular application or for rapid specification of a high-performance application specific integrated circuit mode.
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Citations
12 Claims
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1. A method for transmitting spread spectrum signals, comprising:
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dividing an input data signal among a plurality of parallel segments of transmission data;
spreading each of the plurality of parallel segments to form parallel spread signals using orthogonal or semi-orthogonal PN codes;
summing the parallel spread signals to generate a sum signal;
digitally filtering the sum signal to generate a baseband signal;
converting the baseband signal to an intermediate frequency signal; and
transmitting the intermediate frequency signal.
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2. A method for processing spread spectrum signals at a transmitting side, comprising:
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dividing an input data signal among a plurality of parallel segments of transmission data;
spreading each of the plurality of parallel segments to form parallel spread signals using orthogonal or semi-orthogonal PN codes;
summing the parallel spread signals to generate a sum signal;
providing a single up-converter configured to receive the sum signal; and
generating a baseband signal based on the sum signal. - View Dependent Claims (3)
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4. An integrated circuit that processes spread spectrum signals at a transmitting side, comprising:
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a divider that receives an input data signal and divides the input data signal among a plurality of parallel segments of transmission data;
a spreader responsive to the plurality of segments of transmission data to form parallel spread signals using orthogonal or semi-orthogonal PN codes;
a summer responsive to the parallel spread signals to generate a sum signal;
a digital filter responsive to the sum signal to generate a baseband signal;
a converter responsive to the baseband signal to generate an intermediate frequency signal; and
a transmitter circuit configured to transmit the intermediate frequency signal. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A system for processing spread spectrum signals at a transmitter side, the system comprising:
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a divider responsive to an input data signal to divide the input data signal among a plurality of parallel segments of transmission data;
a spreader responsive to the plurality of segments of transmission data to form parallel spread signals using orthogonal and/or semi-orthogonal PN codes;
a summer responsive to the parallel spread signals to generate a sum signal;
a digital filter responsive to the sum signal to generate a baseband signal;
a converter responsive to the baseband signal to generate an intermediate frequency signal; and
a transmitter circuit that transmits the intermediate frequency signal.
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12. A system for transmitting spread spectrum signals, the system comprising:
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means for dividing an input data signal among a plurality of parallel segments of transmission data;
means for spreading each of the plurality of parallel segments to form parallel spread signals using orthogonal or semi-orthogonal PN codes;
means for summing the parallel spread signals to generate a sum signal;
means for digitally filtering the sum signal to generate a baseband signal;
means for converting the baseband signal to an intermediate frequency signal; and
means for transmitting the intermediate frequency signal.
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Specification