High-Speed Communication Channel Techniques with Improved Robustness to Timing Uncertainty
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Abstract
A method and system using the principle of generalized maximum likelihood estimation to resolve sample timing uncertainties that are associated with the decoding of communication signals. By using generalized maximum likelihood estimation, sample timing uncertainty can be resolved by taking multiple samples of the received signal within a symbol period and determining which sample best corresponds to the optimal sample timing. The sample which best corresponds to the optimal sample timing can be determined from a timing index which can be calculated from ambiguity indicators that are based on the samples of the received signal.
6 Citations
43 Claims
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1-20. -20. (canceled)
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21. A communication system, comprising:
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a receiver comprising an input configured to receive a signal; and a plurality of soft-decoders, each soft-decoder operable to sample the received signal at a different time within a symbol period and to output two values for each sample, the first value comprising a preliminary decoded value and the second value comprising an ambiguity indicator; and a logic device coupled to the each of the soft-decoders, operable to determine a decoded value for each symbol based on one or more preliminary decoded values and ambiguity indicators. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A communication system, comprising:
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a transmitter that is operable to transmit a multi-level signal; a receiver for receiving the multi-level signal over a communication path extending between the receiver and the transmitter, the receiver comprising; an asynchronous soft-decoder that is operable to continuously sample the multi-level signal and produce a decoded output signal and an ambiguous indicator signal; a plurality of first delay elements coupled to a first soft-decoder, each first delay element operable to generate a different delay relative to another first delay element and to produce an ambiguity indicator from the ambiguous indicator signal; a plurality of second delay elements coupled to a second soft-decoder output, each second delay element operable to generate a different delay relative to another second delay element and to produce a preliminary decoded output from the decoded output signal; and a logic device coupled to the each of the first and second delay elements, for determining a decoded value based on one or more of the preliminary decoded outputs and ambiguity indicators. - View Dependent Claims (31, 32, 33)
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34. A signal receiver, comprising:
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an input for receiving a signal; an analog-to-digital converter for sampling the received signal faster than once every symbol period of the received signal and outputting for each sample a first value comprising a preliminary decoded value and a second value comprising an ambiguity indicator; a processor coupled to the converter and operable to; group a subset of sampled first and second values derived from the single symbol period; examine the subset of sampled first and second values; and determine a first value closest to an optimum sampling time based on a principle of generalized maximum likelihood, for decoding the first value closest to the optimum sampling time and outputting that decoded first value as the decoded symbol. - View Dependent Claims (35, 36)
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37. A communication system, comprising:
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a receiver comprising an input for receiving a signal; and a decoding unit that estimates a timing offset for the received signal on a symbol-by-symbol basis and decodes the received signal using generalized maximum likelihood estimation with the estimated timing offset, the decoding unit comprising; a signal splitting element that divides the received signal into a plurality of received signals; and a plurality of delay elements that each delay one of the plurality of received signals, wherein each delay element applies a different time delay than each other delay element. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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Specification