Syndrome-based channel quality or message structure determiner
First Claim
1. A syndrome-based channel quality or message structure determiner for use in a communication system receiver comprising:
- a first digital demodulator, for demodulating a received digital signal to produce a first demodulated received signal;
a first symbol-by-symbol detector, coupled to the first digital demodulator, for computing a first hard-decision vector from the first demodulated received signal;
a first syndrome calculator, coupled to the first symbol-by-symbol detector, for using a first scalar parity check matrix to compute a first syndrome vector from the first hard-decision vector;
a first syndrome pattern memory for storing a first syndrome pattern and an associated first error weight; and
a first syndrome error estimator, coupled to the first syndrome calculator and the first syndrome pattern memory, for locating and removing the first syndrome pattern from the first syndrome vector and calculating a first quality estimation from the first error weight.
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Accused Products
Abstract
A syndrome-based channel quality or message structure determiner (160) uses syndrome vectors to estimate the quality of a received signal in a variable message structure communication system. A digital signal from analog-to-digital converter (150) is separated into multiple branching paths, one for each potential message structure type. In a single path, a digital demodulator (221) demodulates the digital signal to produce a demodulated received signal. A deinterleaver (222) deinterleaves the demodulated received signal, and a symbol-by-symbol detector (2231) hard-decision detects the deinterleaved signal. For each hard-decision vector, at least one syndrome calculator (2241) calculates a syndrome vector. The syndrome vector is analyzed by a syndrome error estimator (2251) having an associated syndrome pattern memory (2271). A comparator (260) analyzes error counter totals from each syndrome error estimator.
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Citations
17 Claims
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1. A syndrome-based channel quality or message structure determiner for use in a communication system receiver comprising:
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a first digital demodulator, for demodulating a received digital signal to produce a first demodulated received signal; a first symbol-by-symbol detector, coupled to the first digital demodulator, for computing a first hard-decision vector from the first demodulated received signal; a first syndrome calculator, coupled to the first symbol-by-symbol detector, for using a first scalar parity check matrix to compute a first syndrome vector from the first hard-decision vector; a first syndrome pattern memory for storing a first syndrome pattern and an associated first error weight; and a first syndrome error estimator, coupled to the first syndrome calculator and the first syndrome pattern memory, for locating and removing the first syndrome pattern from the first syndrome vector and calculating a first quality estimation from the first error weight. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A syndrome-based channel quality or message structure determiner for use in a communication system receiver comprising:
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a first digital demodulator, for demodulating a received digital signal to produce a first demodulated received signal; a first deinterleaver, coupled to the first digital demodulator, for deinterleaving the first demodulated received signal to produce a first deinterleaved signal; a first symbol-by-symbol detector, coupled to the first deinterleaver, for computing a first hard-decision vector from the first deinterleaved signal; a first syndrome calculator, coupled to the first symbol-by-symbol detector, for using a first scalar parity check matrix to compute a first syndrome vector from the first hard-decision vector; a first syndrome pattern memory for storing a first syndrome pattern and an associated first error weight; and a first syndrome error estimator, coupled to the first syndrome calculator and the first syndrome pattern memory, for locating and removing the first syndrome pattern from the first syndrome vector and calculating a first quality estimation from the first error weight. - View Dependent Claims (9, 10, 11)
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12. A cellular radiotelephone comprising:
a syndrome-based channel quality or message structure determiner including; a digital demodulator, for demodulating a received digital signal to produce a demodulated received signal; a symbol-by-symbol detector, coupled to the digital demodulator, for computing a hard-decision vector from the demodulated received signal; a syndrome calculator, coupled to the symbol-by-symbol detector, for using a scalar parity check matrix to compute a syndrome vector from the hard-decision vector; a syndrome pattern memory for storing a syndrome pattern and an associated error weight; and a syndrome error estimator, coupled to the syndrome calculator and the syndrome pattern memory, for locating and removing the syndrome pattern from the syndrome vector and calculating a quality estimation from the error weight. - View Dependent Claims (13)
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14. A method for determining a transmitted signal'"'"'s quality or message structure comprising the steps of:
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demodulating a received digital signal to produce a first demodulated received signal; computing a first hard-decision vector from the first demodulated received signal; using a first scalar parity check matrix to compute a first syndrome vector from the first hard-decision vector; and locating and removing a first syndrome pattern from the first syndrome vector and calculating a first quality estimation from a first error weight. - View Dependent Claims (15, 16, 17)
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Specification