Methods and systems for optimal PN phase detection in DTMB receivers
First Claim
Patent Images
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 for the PN portion of the symbols in the detection range;
applying differential operations to the phase rotated output 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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Abstract
A method and system for pseudorandom noise (“PN”) phase detection in digital terrestrial multimedia broadcast (“DTMB”) receivers. This method selects a detection range of symbols from a frame of the received signal; applies FFT to the PN portion of each of the symbols in the detection range to generate Hn(k); applies phase rotation to Hn(k) to obtain phase rotated for the PN portion of the symbols in the detection range; applies differential operations to to generate Hpd ; sums the Hpd to generated Hsum; calculates a value Q as a function of Hsum; and determines the PN phase offset as a function of Q and a predefined threshold.
10 Citations
20 Claims
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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 for the PN portion of the symbols in the detection range; applying differential operations to the phase rotated output 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- PN”
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11. 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 OFF((m+n)%M) to the FFT output Hn(k) to obtain a phase rotated output for the PN portion of the symbols in the detection range; applying differential operations to the phase rotated output to generate a plurality of values Hpd; summing the plurality of values Hpdto generate a summation output Hsum over the range of the plurality of initial phase offsets (m); 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 p,d,m,n,M and k are integers. - View Dependent Claims (12, 13, 14, 15, 16, 17)
- PN”
-
18. 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 OFF((m+n)%M) to the FFT output Hn(k) to obtain a phase rotated output for the PN portion of the symbols in the detection range, wherein the phase rotated output (m,k) is determined as follows; - View Dependent Claims (19, 20)
- PN”
Specification