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Methods and systems for optimal PN phase detection in DTMB receivers

  • US 9,166,776 B2
  • Filed: 10/04/2013
  • Issued: 10/20/2015
  • Est. Priority Date: 10/04/2013
  • Status: Active Grant
First Claim
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1. A method for pseudorandom noise (“

  • PN”

    ) phase detection of a received signal by a PN phase detector for a digital terrestrial multimedia broadcast (“

    DTMB”

    ) receiver, wherein the received signal has a plurality of frames and each frame of the plurality of frames has a plurality of symbols and each symbol of the plurality of symbols having a PN portion, wherein each PN portion having an initial phase offset designated from a plurality of initial phase offsets (m), comprising the steps of;

    selecting a detection range of symbols by the PN phase detector from a frame of the received signal;

    applying fast-fourier transform (“

    FFT”

    ) to the PN portion of each of the symbols in the detection range to generate an FFT output Hn(k);

    applying phase rotation to the FFT output Hn(k) to obtain a phase rotated output custom character for the PN portion of the symbols in the detection range;

    applying differential operations to the phase rotated output custom character to generate a plurality of values Hpd;

    summing the plurality of values Hpdto generate a summation output Hsum; and

    calculating a quality value Q as a function of the summation output Hsum; and

    determining the PN phase offset by the PN phase detector as a function of the quality value Q and a predefined threshold,wherein the variables n,p,d, and k are integers.

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