SYMBOL ESTIMATION FOR CHAOTIC SPREAD SPECTRUM SIGNAL
First Claim
1. A method for improving symbol estimation in a received data signal, comprising:
- receiving an input data signal at said receiver, said input data signal comprising at least one modulated carrier encoded with a sequence of information symbols, said modulated carrier modulated using a sequence of discrete time chaotic samples generated at a transmitter, each of said discrete time chaotic samples having a shorter sample time interval than a duration of transmission of each of said plurality of information symbols;
generating said sequence of discrete-time chaotic samples at said receiver;
synchronizing said input data signal in time, phase, and frequency with said sequence of discrete-time chaotic samples generated at said receiver; and
obtaining one or more normalization factor values for each of said plurality of information symbols based on comparing a received symbol energy for each of said plurality of information symbols and a symbol energy of said discrete-time chaotic samples associated with said duration of transmission for each of said plurality of symbols.
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Accused Products
Abstract
A communications system includes RF hardware (104) configured for receiving an input data signal includes a modulated carrier encoded with information symbols and modulated using a sequence of discrete time chaotic samples. The system also includes a chaotic sequence generator (340) configured for generating the sequence of discrete-time chaotic samples and a correlator (328). The correlator is configured for synchronizing the input data signal with the sequence of discrete-time chaotic samples and obtaining normalization factor values for each of the information symbols based on comparing a received symbol energy for the information symbols and a symbol energy of the discrete-time chaotic samples associated with the duration of transmission of the information symbols.
104 Citations
18 Claims
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1. A method for improving symbol estimation in a received data signal, comprising:
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receiving an input data signal at said receiver, said input data signal comprising at least one modulated carrier encoded with a sequence of information symbols, said modulated carrier modulated using a sequence of discrete time chaotic samples generated at a transmitter, each of said discrete time chaotic samples having a shorter sample time interval than a duration of transmission of each of said plurality of information symbols; generating said sequence of discrete-time chaotic samples at said receiver; synchronizing said input data signal in time, phase, and frequency with said sequence of discrete-time chaotic samples generated at said receiver; and obtaining one or more normalization factor values for each of said plurality of information symbols based on comparing a received symbol energy for each of said plurality of information symbols and a symbol energy of said discrete-time chaotic samples associated with said duration of transmission for each of said plurality of symbols. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer-readable storage medium, having stored therein a computer program for improving symbol estimation in a receiver, the computer program comprising a plurality of code sections, the code sections executable by a computer for causing the computer to perform the steps of:
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digitizing an input data signal, said input data signal comprising a modulated carrier encoded with a sequence of information symbols, said carrier modulated using a sequence of discrete time chaotic samples generated at remote location, each of said discrete time chaotic samples having a shorter sample time interval than a duration of transmission of each of said plurality of information symbols; generating said sequence of discrete-time chaotic samples; synchronizing said digitized signal in time, phase, and frequency with said generated sequence of discrete-time chaotic samples generated; and obtaining one or more normalization factor values for each of said plurality of information symbols based on comparing a received symbol energy for each of said plurality of information symbols and a symbol energy of said discrete-time chaotic samples associated with said duration of transmission for each of said plurality of symbols. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A communications system, comprising:
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RF hardware configured for receiving a input data signal, said input data signal comprising at least one modulated carrier encoded with a sequence of information symbols, said modulated carrier modulated using a sequence of discrete time chaotic samples generated at a transmitter, each of said discrete time chaotic samples having a shorter sample time interval than a duration of transmission of each of said plurality of information symbols; a chaotic sequence generator configured for generating a sequence of discrete-time chaotic samples identical to said sequence of discrete-time chaotic samples generated at said transmitter; and a correlator configured for; synchronizing said input data signal in time, phase, and frequency with and said identical sequence of discrete-time chaotic samples; and obtaining one or more normalization factor values for each of said plurality of information symbols based on comparing a received symbol energy for each of said plurality of information symbols and a symbol energy of said discrete-time chaotic samples associated with said duration of transmission for each of said plurality of symbols. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification