Communication channel with undersampled interpolative timing recovery
First Claim
1. An apparatus comprising:
- a sampling circuit which performs lossy sampling of a continuous signal to provide a corresponding sequence of discrete samples at a sampling rate less than a Nyquist rate of the continuous signal;
a processing circuit which reconstructs an informational content of the continuous signal from the discrete samples, the processing circuit configured to insert at least one additional sample into said sequence to increase an effective rate of said sampling; and
a memory space coupled between the sampling circuit and the processing circuit which temporarily stores the sequence of discrete samples.
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Abstract
Method and apparatus for processing transmitted data. A sampling circuit preferably performs lossy sampling of a continuous signal to provide a corresponding sequence of discrete samples at a sampling rate less than a Nyquist rate of the continuous signal. A processing circuit reconstructs an informational content of the continuous signal from the discrete samples, and operates to periodically insert additional samples into the sequence, which preferably increases an effective rate of said sampling to match or exceed the Nyquist rate. Preferably, the lossy discrete samples are temporarily stored in a memory space prior to reconstruction by the processing circuit. The sampling circuit preferably comprises an analog-to-digital converter (ADC) of an analog front end (AFE). The processing circuit preferably comprises a digital back end (DBE) employing partial-response, maximum-likelihood (PRML) detection. The additional samples are preferably provided by an iterative timing recovery (ITR) block of the DBE.
77 Citations
19 Claims
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1. An apparatus comprising:
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a sampling circuit which performs lossy sampling of a continuous signal to provide a corresponding sequence of discrete samples at a sampling rate less than a Nyquist rate of the continuous signal; a processing circuit which reconstructs an informational content of the continuous signal from the discrete samples, the processing circuit configured to insert at least one additional sample into said sequence to increase an effective rate of said sampling; and a memory space coupled between the sampling circuit and the processing circuit which temporarily stores the sequence of discrete samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. An apparatus comprising a sampling circuit configured to generate a sequence of discrete samples by sampling a continuous signal at a sampling rate less than a Nyquist rate of the continuous signal, and a processing circuit which periodically inserts additional samples into the sequence of discrete samples to increase an effective rate of said sampling to an effective level that approximates or exceeds the Nyquist rate, and wherein the processing circuit processes the sequence of discrete samples in an order that is different from an order in which said samples are received.
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13. A method comprising steps of:
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performing lossy sampling of a continuous signal to provide a corresponding sequence of discrete samples at a sampling rate less than a Nyquist rate of the continuous signal; temporarily storing the discrete samples in a memory space; and reconstructing an informational content of the continuous signal from the stored discrete samples, wherein said reconstructing comprises inserting at least one additional sample into said sequence to increase an effective rate of said sampling. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification