Multiple user digital receiver apparatus and method with combined multiple frequency channels
First Claim
Patent Images
1. A digital receiver for multiple simultaneous users, comprising:
- means for digitizing an input radio frequency (RF) signal,means for digitally tuning to a plurality of desired frequency subbands within said input signal so that said desired subbands are offset from each other within a selected frequency band,means for digitally isolating said selected frequency band from the remainder of said input signal, andmeans for digitally separating, demodulating and processing said desired frequency subbands from said isolated frequency band to provide multiple outputs from said receiver.
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Abstract
A digital receiver apparatus and method, designed for multiple simultaneous users, digitizes a received analog RF signal and performs multiple frequency translations of the signal so that desired stations are grouped into a common frequency band separate from the remaining stations. This frequency band is then isolated, and the individual selected stations are digitally separated, demodulated and processed to provide multiple simultaneous outputs. The frequency translations are preferably performed initially on a time multiplexed basis. Isolated station separation is performed either by time multiplexing, or by the use of multiple phase or tan locked loops.
61 Citations
28 Claims
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1. A digital receiver for multiple simultaneous users, comprising:
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means for digitizing an input radio frequency (RF) signal, means for digitally tuning to a plurality of desired frequency subbands within said input signal so that said desired subbands are offset from each other within a selected frequency band, means for digitally isolating said selected frequency band from the remainder of said input signal, and means for digitally separating, demodulating and processing said desired frequency subbands from said isolated frequency band to provide multiple outputs from said receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A digital receiver for multiple simultaneous users, comprising:
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means for digitizing an input radio frequency (RF) signal, means for performing multiple frequency translations of said RF signal relative to a selected frequency band so that, for each translation, a respective desired frequency subband of said RF signal occupies said selected frequency band substantially exclusive of the other portions of said RF signal, intermediate frequency (IF) digital filter means for isolating said selected frequency band, and means for digitally separating, demodulating and processing said desired frequency subbands from said isolated band to provide multiple outputs from said receiver. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A digital reception method for an RF signal having multiple desired frequency subbands, comprising:
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digitizing said RF signal, performing multiple frequency translations of said digitized signal to translate each of said desired subbands into discrete portions of a selected frequency band, digitally filtering said digitized RF signal after said frequency translations to isolate said frequency band, and digitally separating, demodulating and processing said desired frequency subbands from said isolated selected band to provide multiple outputs from said receiver. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification