Multiple Symbol Noncoherent Soft Output Detector
AssigneeMojix, Inc.
InventorsDariush Divsalar, Ramin Sadr
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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.
Claims20
A receiver system, comprising:
- 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.
A combined receiver system, comprising:
- a plurality of receivers configured to receive and sample an input signal, where the input signal comprises data that is phase modulated onto a carrier;
- a plurality of multiple symbol noncoherent soft output detectors configured to receive a sampled 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;
- and
- a combiner configured to receive the soft metrics from the plurality of multiple symbol noncoherent soft output detectors and to detect data based upon the soft metrics.
A radio frequency identification (RFID) receiver system configured to detect phase modulated data transmitted by RFID tags, the RFID receiver system comprising:
- an antenna configured to receive a phase modulated signal comprising 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 input signal and to generate soft metrics indicative of the reliability of a detected symbol based upon observations over multiple symbols.
Dependencies are inferred from the claim text.