Methods and apparatus for transmitting and receiving randomly inverted wideband signals
First Claim
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1. A method for generating wideband signals for transmitting source data, the wideband signals including wideband signal pulses and having reduced discrete power spectral density (PSD) components, the method comprising the steps of:
- pulse modulating the source data;
repeating and time hopping pulses within the pulse modulated source data;
selectively inverting the polarity of the repeated and time hopped pulses; and
modulating the wideband signal pulses with the selectively inverted pulses.
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Abstract
Methods and apparatus for transmitting, receiving, and processing wideband signals with reduced discrete power spectral density components are disclosed. The wideband signals with reduced discrete power spectral density components are generated through pulse modulation, repeating and time hopping, and random inversion. A receiver reverses the random inversion and demodulates the signal.
30 Citations
27 Claims
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1. A method for generating wideband signals for transmitting source data, the wideband signals including wideband signal pulses and having reduced discrete power spectral density (PSD) components, the method comprising the steps of:
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pulse modulating the source data;
repeating and time hopping pulses within the pulse modulated source data;
selectively inverting the polarity of the repeated and time hopped pulses; and
modulating the wideband signal pulses with the selectively inverted pulses. - View Dependent Claims (2, 3)
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4. An apparatus for generating wideband signals for transmitting source data, the wideband signals including wideband signal pulses and having reduced discrete power spectral density (PSD) components, the apparatus comprising:
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a modulator that pulse modulates the source data;
a repeater coupled to the modulator, the repeater configured to repeat and time hop pulses within the pulse modulated source data;
an inverter coupled to the repeater, the inverter configured to selectively invert the polarity of the repeated and time hopped pulses; and
a pulse shaping circuit coupled to the inverter, the pulse shaping circuit configured to modulate the wideband pulses with the selectively inverted pulses for transmission. - View Dependent Claims (5, 6)
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7. A method for processing a wideband signal carrying a data signal having randomly inverted pulses, the randomly inverted pulses generated from source data that is pulse modulated, repeated, and time hopped, the method comprising the steps of:
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receiving the data signal carried by the wideband signal;
sampling the received data signal at time hopped positions;
selectively inverting the pulses within the received data signal;
summing corresponding repeated pulses within the received data signal after sampling and inverting; and
deriving the source data from the summed pulses. - View Dependent Claims (8, 9)
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10. An apparatus for processing a wideband signal having randomly inverted pulses, the randomly inverted pulses generated from source data that is pulse modulated, repeated, and time hopped, the apparatus comprising:
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a filter configured to receive and discriminate the wideband signal having randomly inverted pulses;
an inverted coupled to the filter, the inverter configured to selectively invert the randomly inverted pulses to remove the random inversion;
a summing circuit coupled to the inverter, the summing circuit configured to sum corresponding repeated pulses; and
a demodulator coupled to the summing circuits, the demodulator configured to demodulate the summed corresponding repeated pulses to derive the source data. - View Dependent Claims (11, 12)
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13. A receiving method for use with a wideband signal having randomly inverted pulses, the method comprising the steps of:
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receiving the wideband signal; and
applying a function to map pulses of either polarity within the wideband signal to a single polarity to produce a pulse stream in which all pulses have the same polarity. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A receiving apparatus for processing a wideband signal having randomly inverted pulses having either a first polarity or a second polarity opposite the first polarity, the apparatus comprising:
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a filter configured to receive and discriminate the wideband signal having randomly inverted pulses; and
a function circuit coupled to the filter, the function circuit configured to map pulses of either polarity within the wideband signal to a single polarity to produce a pulse stream in which all pulses have the same polarity. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification