Wideband frequency hopping spread spectrum transceivers and related methods
First Claim
Patent Images
1. A wideband frequency hopping spread spectrum transceiver, comprising:
- a wideband frequency hopping spread spectrum transmitter, comprising;
sampling circuitry configured to receive a transmit signal at a transmit intermediate frequency fIFTX and to receive sampling signals at a transmit sample clock frequency fSTX and configured to generate sampled output signals having a plurality of frequency components, the frequency components including frequencies at two or more harmonics of fSTX plus and minus fIFTX;
frequency select filter circuitry configured to receive the sampled output signals and to receive a frequency selection signal, the frequency select filter circuitry configured to provide a plurality of different selectable filter passband frequency ranges across a bandwidth that includes at least two harmonics of the transmit sample clock frequency fSTX, the frequency select filter circuitry further having an output signal within a selected filter passband frequency range that includes one frequency component of the sampled output signals;
frequency hopping control circuitry configured to output the frequency selection signal and to adjust the frequency selection signal over time so that the output signal hops to different frequency components depending upon the selected filter passband frequency range; and
transmit antenna circuitry configured to transmit the output signal as it hops to different frequency components over time; and
a wideband frequency hopping spread spectrum receiver, comprising;
receive antenna circuitry configured to receive input receive signals from a wideband frequency hopping spread spectrum transmitter as it hops to different frequency components over time;
sampling circuitry configured to receive the input receive signals at a radio frequency fRF, to receive sampling signals at a receive sample clock frequency fSRX and to generate sampled output signals having a plurality of frequency components, the frequency components including frequencies at two or more harmonics of fSRX plus and minus fRF, and the frequency components including at least one frequency component at a receive intermediate frequency fIFRX; and
filter circuitry configured to provide a filter passband frequency range including the receive intermediate frequency fIFRX, the filter circuitry further configured to receive the sampled output signals and to have an output signal that includes the frequency component of the sampled output signals at the receive intermediate frequency fIFRX.
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Abstract
Ultra-wideband frequency hopping spread spectrum (UWB-FHSS) solutions are used for transceiver architectures. These UWB-FHSS transceiver architectures can transmit and accurately digitize frequency hops over an extremely wide bandwidth while using a relatively slow analog-to-digital converter (ADC) without suffering from unacceptable performance degradation. For example, ADCs can be used having sample rates lower than standard Nyquist criteria would require for the bandwidth of the spread spectrum utilized.
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Citations
20 Claims
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1. A wideband frequency hopping spread spectrum transceiver, comprising:
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a wideband frequency hopping spread spectrum transmitter, comprising; sampling circuitry configured to receive a transmit signal at a transmit intermediate frequency fIFTX and to receive sampling signals at a transmit sample clock frequency fSTX and configured to generate sampled output signals having a plurality of frequency components, the frequency components including frequencies at two or more harmonics of fSTX plus and minus fIFTX; frequency select filter circuitry configured to receive the sampled output signals and to receive a frequency selection signal, the frequency select filter circuitry configured to provide a plurality of different selectable filter passband frequency ranges across a bandwidth that includes at least two harmonics of the transmit sample clock frequency fSTX, the frequency select filter circuitry further having an output signal within a selected filter passband frequency range that includes one frequency component of the sampled output signals; frequency hopping control circuitry configured to output the frequency selection signal and to adjust the frequency selection signal over time so that the output signal hops to different frequency components depending upon the selected filter passband frequency range; and transmit antenna circuitry configured to transmit the output signal as it hops to different frequency components over time; and a wideband frequency hopping spread spectrum receiver, comprising; receive antenna circuitry configured to receive input receive signals from a wideband frequency hopping spread spectrum transmitter as it hops to different frequency components over time; sampling circuitry configured to receive the input receive signals at a radio frequency fRF, to receive sampling signals at a receive sample clock frequency fSRX and to generate sampled output signals having a plurality of frequency components, the frequency components including frequencies at two or more harmonics of fSRX plus and minus fRF, and the frequency components including at least one frequency component at a receive intermediate frequency fIFRX; and filter circuitry configured to provide a filter passband frequency range including the receive intermediate frequency fIFRX, the filter circuitry further configured to receive the sampled output signals and to have an output signal that includes the frequency component of the sampled output signals at the receive intermediate frequency fIFRX. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20)
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11. A method for communicating wideband frequency hopping spread spectrum signals, comprising:
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sampling a transmit signal at a transmit intermediate frequency fIFTX using sampling signals at a transmit sample clock frequency fSTX to generate sampled output signals having a plurality of frequency components, the frequency components including frequencies at two or more harmonics of fSTX plus and minus fIFTX; selecting one of the frequency components using frequency select filter circuitry; transmitting the selected frequency component as an output signal; repeating the sampling, selecting and transmitting steps to select and transmit different frequency components so that the output signals hop to different frequency components over time; receiving an input receive signal at a radio frequency fRF as it hops to different frequency components over time; sampling the input receive signal using sampling signals at a receive sample clock frequency fSRX to generate sampled output signals having a plurality of frequency components, the frequency components including frequencies at two or more harmonics of fSRX plus and minus fRF, and the frequency components including at least one frequency component at a receive intermediate frequency fIFRX; and filtering the sampled signals with a filter passband frequency range around the receive intermediate frequency fIFRX to generate an output signal that includes the frequency component of the sampled output signals at the receive intermediate frequency fIFRX. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification