Multiple symbol noncoherent soft output detector
First Claim
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1. A receiver system, comprising:
- a receiver configured to receive and sample a phase modulated input signal, where the phase modulated input signal is a FM0 modulated signal comprising a plurality of symbols; and
a multiple symbol noncoherent soft output detector configured to receive the sampled phase modulated input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal, where the soft metric is computed as
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Abstract
Multiple symbol noncoherent soft output detectors in accordance with embodiments of the invention are disclosed. In a number of embodiments, the multiple symbol noncoherent soft output detector uses soft metrics based on the Log Likelihood Ratio (LLR) of each symbol to provide information concerning the reliability of each detected symbol. One embodiment of the invention includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols.
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Citations
33 Claims
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1. A receiver system, comprising:
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a receiver configured to receive and sample a phase modulated input signal, where the phase modulated input signal is a FM0 modulated signal comprising a plurality of symbols; and a multiple symbol noncoherent soft output detector configured to receive the sampled phase modulated input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal, where the soft metric is computed as - View Dependent Claims (2, 3, 4, 5, 6)
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7. A combined receiver system, comprising:
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a plurality of receivers configured to receive and sample an input signal, where the input signal is a FM0 modulated signal comprising a plurality of symbols conveying data that is phase modulated onto a carrier; a plurality of multiple symbol noncoherent soft output detectors each configured to receive a sampled phase modulated input signal from one of the plurality of receivers and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal, where each soft metric is computed as - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A radio frequency identification (RFID) receiver system configured to detect phase modulated data transmitted by RFID tags, the RFID receiver system comprising:
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an antenna configured to receive a phase modulated signal where the phase modulated signal is a FM0 modulated signal comprising a plurality of symbols transmitted by an RFID tag; a receiver configured to sample the phase modulated signal; and a multiple symbol noncoherent soft output detector configured to receive the sampled phase modulated input signal and to generate soft metrics indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal, where each soft metric is computed as - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A combined radio frequency identification (RFID) receiver system configured to detect phase modulated data transmitted by an RFID tag, the RFID receiver system comprising:
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a plurality of antennas configured to receive an input signal transmitted by an RFID tag, where the input signal is a FM0 modulated signal comprising a plurality of symbols conveying data that is phase modulated onto a carrier; a plurality of receivers configured to sample the phase modulated signal from at least one of the plurality of antennas; a plurality of multiple symbol noncoherent soft output detectors configured to receive the sampled phase modulated input signal from one of the plurality of receivers and to generate soft metrics indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal, where each soft metric is computed as - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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Specification