Multiple symbol noncoherent soft output detector
First Claim
1. A method of generating a soft metric indicative of the reliability of a detected symbol, the method comprising:
- receiving and sampling a phase modulated input signal using a receiver, where the phase modulated input signal is an FM0 modulated signal comprising a plurality of symbols; and
receiving the sampled phase modulated input signal and generating a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal using a multiple symbol noncoherent soft output detector, 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.
63 Citations
26 Claims
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1. A method of generating a soft metric indicative of the reliability of a detected symbol, the method comprising:
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receiving and sampling a phase modulated input signal using a receiver, where the phase modulated input signal is an FM0 modulated signal comprising a plurality of symbols; and receiving the sampled phase modulated input signal and generating a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal using a multiple symbol noncoherent soft output detector, where the soft metric is computed as - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of generating a soft metric indicative of the reliability of a detected symbol, the method comprising:
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receiving and sampling an input signal at each of a plurality of receivers, where the input signal is a FM0 modulated signal comprising a plurality of symbols conveying data that is phase modulated onto a carrier; receiving a sampled phase modulated input signal from one of the plurality of receivers and generating a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols of the phase modulated input signal by each of a plurality of multiple symbol noncoherent soft output detectors, where each soft metric is computed as - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification