Demodulation and decoding
AssigneeNXP B.V.
InventorsSemih SERBETLI, Nur ENGIN, Alessio FILIPPI
Life of this patent
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Abstract
Receivers and methods of operation are described. A receiver for a modulated signal of a communication system, comprises a demodulator to demodulate the received modulated symbols of a received signal into received soft-bits. A hard-decision decoder is arranged and configured to decode the received soft-bits into decoded bits. A feedback loop is arranged to provide feedback from the hard decision decoder to the demodulator. the feedback loop is configured to re-encode the decoded bits from the hard-decision decoder into re-encoded bits. The demodulator is further arranged and configured to iteratively demodulate the received modulated signal using an output of the feedback loop.
Claims15
A receiver for a modulated signal of a communication system, comprising:
- a demodulator arranged and configured to demodulate the received modulated symbols of a received signal into received soft-bits;
- a hard-decision decoder arranged and configured to decode the received soft-bits into decoded bits;
- a feedback loop arranged to provide feedback from the hard decision decoder to the demodulator, the feedback loop being configured to re-encode the decoded bits from the hard-decision decoder into re-encoded bits and wherein the demodulator is further arranged and configured to iteratively demodulate the received modulated signal using an output of the feedback loop.
The receiver as claimed in any preceding claim, wherein the demodulator is a coherent demodulator and wherein the receiver further comprises a channel estimator configured and arranged to supply an estimate of a communications channel over which the modulated signal was received to the coherent demodulator.
The receiver as claimed in any preceding claim and further comprising a channel change estimator and compensator arranged to receive the received modulated symbols and/or estimated modulated symbols and configured to estimate changes in a communications channel over which the modulated signal was sent and to compensate for those changes to improve the received modulated symbols and/or the estimated modulated symbols.
The receiver as claimed in any preceding claim and further comprising a symbol buffer arranged to receive the received modulated symbols and buffer the received modulated symbols while the feedback loop generates the output.
A package including an integrated circuit, wherein the integrated circuit is configured to provide the receiver of any preceding claim.
A method of iteratively demodulating a modulated signal of a communication system, the method comprising:
- demodulating received modulated symbols into soft-bits using a demodulator;
- hard-decision decoding the soft-bits into decoded bits using a hard-decision decoder;
- re-encoding the decoded bits output by the hard-decision decoder into re-encoded bits;
- feeding back the re-encoded bits or estimated modulated symbols obtained from the re-encoded bits to the demodulator;
- and
- iteratively demodulating the modulated signal using the re-encoded bits or the estimated modulated symbols.
Dependencies are inferred from the claim text.