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A Bpsk/qpsk Timing-error Detector For Sampled Receivers Pdf

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Timing Recovery In Digital Synchronous Data Receivers

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Gardner Algorithm Timing Recovery

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Mueller Muller Timing Recovery Tutorial

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ComparedOEMs traditionally used DSP-based hardware, plugged into a PC, for motion control. But new software-based solutions have challenged this approach, claiming equal or better performance at lower cost.View Forums comp.dsp Gardner TED Started by rider ●April 1, 2004 ChronologicalNewest First Hi! I have a query regarding the computation of Gardner Timing Error detector (TED). Dr. Gardner on his article "A BPSK/QPSK Timing Error Detector for Sampled Receivers" states that Timing Error (for BPSK) can be computed as: U(r) = x(r-1/2)[x(r)-x(r-1)] He calls the samples x(r) as "STROBE" values and those like x(r-1/2) as "MIDWAY" between strobes [like x(r-1/2) is midway between x(r) and x(r-1)]. Its also https://www.scribd.com/doc/61575576/A-BPSK-QPSK-Timing-Error-Detector-for-Sampled mentioned that this algorithm uses only 2 samples/symbol to compute the error. I need to ask that: 1)What he means by these STROBE and MIDWAY values ,x(r) and x(r-1/2) , and how to compute them from the available 2 samples/symbol? 2) For the complete timing recovery loop, there is also an interpolator. If the interpolator is fed with 2 samples/symbol, then what is it computing? is it computing the midway https://www.dsprelated.com/showthread/comp.dsp/10330-1.php value x(r-1/2) or what? Regards Rider Reply Posted by Kevin Neilson ●April 1, 2004"rider" wrote in message news:ca3a68c8.0403312046.7db78add@posting.google.com... > Hi! > > I have a query regarding the computation of Gardner Timing Error > detector (TED). Dr. Gardner on his article "A BPSK/QPSK Timing Error > Detector for Sampled Receivers" states that Timing Error (for BPSK) > can be computed as: > > U(r) = x(r-1/2)[x(r)-x(r-1)] > > He calls the samples x(r) as "STROBE" values and those like x(r-1/2) > as "MIDWAY" > between strobes [like x(r-1/2) is midway between x(r) and x(r-1)]. > > Its also mentioned that this algorithm uses only 2 samples/symbol to > compute the error. I need to ask that: > > 1)What he means by these STROBE and MIDWAY values ,x(r) and x(r-1/2) , > and how to compute them from the available 2 samples/symbol? > > 2) For the complete timing recovery loop, there is also an > interpolator. If the interpolator is fed with 2 samples/symbol, then > what is it computing? is it computing the midway value x(r-1/2) or > what? > > Regards > Rider You are sampling two samples per symbol, so if the loop is locked and you are sampling at the sym

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