CN107454029A - PN sequence Phase synchronization for digital ground multimedia broadcast receiver - Google Patents

PN sequence Phase synchronization for digital ground multimedia broadcast receiver Download PDF

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Publication number
CN107454029A
CN107454029A CN201610371314.1A CN201610371314A CN107454029A CN 107454029 A CN107454029 A CN 107454029A CN 201610371314 A CN201610371314 A CN 201610371314A CN 107454029 A CN107454029 A CN 107454029A
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frame
sequence
symbol
signal
digital ground
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CN107454029B (en
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米哈伊尔·沃利安斯奇
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Rohde and Schwarz GmbH and Co KG
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Rohde and Schwarz GmbH and Co KG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
    • H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0063—Elements of loops
    • H04L2027/0067—Phase error detectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0083—Signalling arrangements
    • H04L2027/0089—In-band signals
    • H04L2027/0093—Intermittant signals
    • H04L2027/0095—Intermittant signals in a preamble or similar structure

Abstract

The present invention relates to a kind of for the method for pseudo noise (PN) phase-detection of digital ground multimedia broadcast (DTMB) signal received.The signal received includes multiple signal frames.Each signal frame has frame head and frame.Frame head has the PN sequence of symbol.The first paragraph of the symbol of first PN sequence of the first signal frame is extracted.The second segment of the symbol of second PN sequence of the second frame is extracted.First PN sequence and the second PN sequence belong to direct continuous signal frame.Difference between first PN sequence and the second PN sequence is determined based on the circulation cross-correlation of first paragraph and second segment.The frame number of signal frame is determined based on difference.

Description

PN sequence Phase synchronization for digital ground multimedia broadcast receiver
Technical field
The present invention relates to pseudo noise (PN) phase of the digital ground multimedia broadcast for receiving (DTMB) signal The method and apparatus of position detection
Background technology
Digital ground multimedia broadcast (DTMB) is to be used for example in the digital terrestrial television standard in China, Hong Kong and Macao. Digital ground multimedia broadcast uses the signal frame in superframe.Each signal frame includes frame head and frame.Frame head include it is pseudo- with Machine noise (PN) sequence.PN sequence be used to estimating frequency shift (FS) and sampling frequency deviation and for channel estimation and The removal of intersymbol interference.The phase of PN sequence be for the synchronization to digital ground multimedia radio receiver to Close important.Because the accurate phase of the PN sequence of signal frame is not in advance, it is known that so it be able to must enter One step is determined before assessing PN sequence.
Code obtaining is typically based on that the signal received is to the PN sequence being locally generated related to be performed.Should The shortcomings that method is the not best performance in the channel that is failed by multipath, such as Single Frequency Network.Digital ground multimedia broadcast The slightly different method and system of the PN sequence phase-detection of receiver for example also from US 9,166,776B2 and Know in US 8,693,606.However, speed and complexity of all these known method and systems in the algorithm applied Aspect is not effective enough.
The content of the invention
The present invention provides a kind of for the pseudo noise of digital ground multimedia broadcast (DTMB) signal received (PN) method of phase-detection.The signal received includes multiple signal frames.Each signal frame in multiple signal frames includes Frame and frame head.Frame head includes the PN sequence of symbol.Each PN sequence of signal frame has predetermined Phase offset.According to aspects of the present invention, the first paragraph of the symbol of the first PN sequence of the first signal frame and The second segment of the symbol of second PN sequence of binary signal frame is chosen.In other words, first paragraph and second segment are from first Extracted in the PN sequence of the frame head of signal frame and secondary signal frame.First PN sequence and the second pseudorandom Noise sequence belongs advantageously to (direct) continuous (neighbouring) signal frame of identical superframe.First PN sequence and the second puppet Phase difference between random noise sequences is calculated based on the circulation cross-correlation of first paragraph and second segment.First signal frame and/or The frame number of secondary signal frame is calculated based on the phase difference of determination.The method according to the invention it is complicated unlike other method and for There is superperformance for (i.e. without singly export) system (such as Single Frequency Network (SFN)) by multipath decline.
Circulate cross-correlation can generally by using Fast Fourier Transform (FFT) (FFT) all time domain or at least partially in Frequency domain is determined.Therefore, circulating cross-correlation can include in the time domain by the symbol of first paragraph and the corresponding symbol of second segment Complex conjugate multiplication.In another embodiment, it is determined that the step of circulating cross-correlation can be including the use of Fast Fourier Transform (FFT).The The symbol of one section and second segment and then can be transformed to frequency domain by Fast Fourier Transform (FFT).Then circulation cross-correlation can lead to Cross the complex conjugate generation of the Fast Fourier Transform (FFT) by the caused coefficient of one section of Fast Fourier Transform (FFT) Yu another section System be multiplied and determine.The result can be transformed to time domain by inverse fast fourier transform (IFFT).Fast Fourier The Effective Numerical that conversion and inverse fast fourier transform are advantageously used in cross-correlation whereby calculates.
The maximum for circulating cross-correlation function indicates the time point (i.e. amplitude or index) of best aligned signal.Change speech It, the time delay between two signals is determined by the amplitude of the maximum of circulation cross-correlation function.If first paragraph is by r1Draw With and the quantity of symbol be NPER, and second segment is by r2Quote and the quantity of symbol is NPER, then first paragraph and second segment follow Ring cross-correlation can be expressed as following formula (1)：
For m=0...NPER-1
In formula above (1), r* 2Indicate r2Complex conjugate, and " mod " is modulus operator.Index n and m combination mould is transported Operator mod NPERThe r of offer* 2Cyclic shift.The circulation cross-correlation of the symbol of first paragraph and the symbol of second segment means when n surpasses Cross NPERThe complex conjugate symbol of one (here for second segment) when -1 (when n is reset as 0) in cyclic shift section Number so that during each cyclic shift, the symbol cyclic shift one of the symbol sebolic addressing of a correspondent section (second segment here) Individual position.
DifferenceCan and then it be determined according to formula (2)：
In the presence ofCorresponding between the phase of PN sequence.Moreover, two of identical superframe it is neighbouring/ The difference of the PN sequence of signal frame is also the indicator of the signal frame number of two signal frames.Signal frame number is in superframe Signal frame counting.Signal frame number can and then be determined by using look-up table or using set of formulas.Use lookup Table can also support the speed and efficiency of this method.
Frame head is advantageously arranged frame head mode PN420 or frame head mode according to digital ground multimedia broadcast standard PN945。
Advantageously, the quantity (N of the symbol of each sectionPER) can be less than the symbol of the PN sequence of frame head Quantity.For example, the quantity of the symbol of first paragraph and second segment can be less than 255 or for PN945 for PN420 Less than 511.This aspect further improves efficiency.
The present invention also provide a kind of equipment, particularly digital ground multimedia broadcast receiver either measurement apparatus or point Parser, it is configured as performing method and step described herein.
Brief description of the drawings
The other side and feature of the present invention produces in being described on accompanying drawing below preferred embodiment, wherein
Fig. 1 is the simplification figure of embodiments of the invention, and
Fig. 2 is the simplification figure of the frame structure of digital ground multimedia broadcast signal.
Embodiment
Fig. 2 is the simplification figure of the frame structure of digital ground multimedia broadcast signal.In the presence of with four kinds shown in hierarchic sequence Different type frame：Day frame CDF, framing MF, superframe SUPF and signal frame SF.、
Day, frame CDF was with the duration of 24 hours and including 1440 framing MF.Each framing MF has lucky 1 point Duration of clock and including 480 superframe SUPF.Each superframe SUPF has 125ms duration and including multiple letter Number frame SF, signal frame SF quantity depend on the duration of signal frame.Signal frame SF is substantially divided into two parts：Frame head FH and Frame FB.Frame head FH includes PN sequence (and lead code and rear leading code), and frame FB includes data block.
Three kinds of different types of frame heads in digital ground multimedia broadcast standard be present：The first kind " PN420 ", second Type " PN595 " and the 3rd type " PN945 ".The present invention is applied to first kind PN420 and the 3rd type PN945.For For PN420, signal frame SF has 555.6 μ s duration, and for PN595, signal frame SF has 578.703 μ s' Duration, and for PN945, signal frame SF has 625 μ s duration, and it corresponds respectively to each superframe SUPF 225,216 and 200 signal frame SF.The quantity of digital " 420 " and " 945 " designated symbol.For example, type PN420 frame head has the rear leading code of the lead code of 82 symbols, the PN sequence of 255 symbols and 83 symbols, That is 420 symbols altogether.Type PN945 frame head has the lead code of 217 symbols, the pseudo noise sequence of 511 symbols The rear leading code of row and 217 symbols, i.e. 945 symbols altogether.
PN sequence is binary PN sequence and with similar with random binary sequence is in Existing auto-correlation.PN sequence (such as can realize that specific generator is polynomial linear anti-by sequential logical circuit Present shift register (LFSR)) generation.LFSR is reset to initial phase at each superframe SUPF beginning.Superframe SUPF Signal frame SF in the PN sequence of each differ predetermined phase shift.LFSR determines each signal frame SF puppet The phase of random noise sequences.For frame head type PN420,225 pseudo random noises with out of phase can be generated Sound sequence.For frame head type PN945,200 PN sequences with out of phase can be generated.Change speech It, the difference between the phase shift of continuous or neighbouring PN sequence and thus two continuous PN sequences For the indicator of the signal frame SF frame number used in superframe SUPF.
Fig. 1 is the simplification figure of embodiments of the invention.Signal frame SF (k-1), SF (k) and SF (k+1) are represented from superframe The extraction of SUPF signal frame SF longer sequence.Because current embodiment require that two neighbouring signal frames, are further begged for By only signal frame SF (k) and signal frame SF (k+1).These signal frames are referred to as the first signal frame SF (k) and secondary signal frame SF (k+1), and signal frame SF (k) actual frame number is certainly random in the whole sequence of signal frame.Signal frame SF symbol Quantity be NFRAME.Each signal frame SF includes frame head FH and frame FB.Accordingly, there exist the first of the first signal frame SF (k) Frame head FH (k) and the first frame FB (k) and the second frame head FH (k of secondary signal frame SF (k+1) be directly adjacent to or continuous + 1) and the first frame FB (k+1).The first paragraph r of continuous symbol1Selected from (or extracting from) first frame head FH (k).First paragraph r1 The quantity of symbol be NPER.The second segment r of continuous symbol2It is selected from or extracts from the second frame head FH (k+1).Second segment r2Symbol Number quantity be also NPER.First paragraph r1With second segment r2Extract from the centre of each in frame head FH (k) and FH (k+1) Some places.The quantity N of the symbol of each sectionPERThe number of whole frame head FH (k) or FH (k+1) symbol can be respectively smaller than Amount.Moreover, the quantity N of the symbol of each sectionPERThe quantity of the symbol of the PN sequence of each frame head can be less than It is less than 255 i.e. for example for PN420 or for PN945 less than 511.
First paragraph r in first frame head FH (k)1Position and the second frame head FH (k+1) in second segment r2Position pair Should.This corresponding arrow N of total length or comparative overall length as the symbol with signal frame SFFRAME.Therefore, two section r1And r2 In each include the identical quantity N of symbolPER, wherein, the symbol in each section has corresponding first frame head FH respectively (k) and the second frame head FH (k+1) in correspondence position.
The symbol of first paragraph and/or second segment can be filled with zero " 0 ", thus the length of expanding section.This can be to be fast Fast Fourier transformation prepares the section r of extraction1And r2It is useful or even necessary, because this is known in the art.By One section of r1Then the First ray of the symbol of caused extension is x1.By second segment r2Second sequence of the symbol of caused extension Then it is x2。
First paragraph r1(i.e. by first paragraph r1Caused symbol sebolic addressing x1) and then frequency domain transformed to by Fast Fourier Transform (FFT). Equally, second segment r2(i.e. by second segment r2Caused symbol sebolic addressing x2) and then frequency domain transformed to by Fast Fourier Transform (FFT).By sequence Arrange x1And x2Fast Fourier Transform (FFT) caused by coefficient and then be referred to as X1And X2。
X1Complex conjugate (it is X1 *) and then and X2It is multiplied.The result (X1 *X2) can be converted by inverse fast fourier transform Time domain is returned to, generation includes r1And r2Cross-correlationW y.
First paragraph r1With second segment r2It can also be expressed as：
Numerical value W can be then expressed as
For r1And r2Cross-correlation：
The N for m=0 ...PER-1
If channel impulse response h is time invariant, cross-correlation
It can utilizeWithAnd it is simplified as follows：
S-DFor length NPERPN sequenceCyclic shift.Two neighbouring letters The cyclic shift D of the PN sequence of number frame also for adjacent signal frame SF (k) and SF (k+1) PN sequence it Between difference.The estimation of phase shift between two adjacent signal frame SF (k) and SF (k+1) PN sequenceCan be right After be represented as
Due to existingCorresponding between PN sequence, thus the mapping of the frame number of signal frame or It is determined that it can be performed by using look-up table or using set of formulas.

Claims (7)

  1. It is 1. a kind of for pseudo noise (PN) phase-detection of digital ground multimedia broadcast (DTMB) signal for receiving Method, wherein, the signal received includes multiple signal frames, and each signal frame in multiple signal frames includes frame head and frame Body, the frame head include the PN sequence of symbol, wherein, each PN sequence of signal frame, which has, to be made a reservation for Phase shift, methods described include：Select the first paragraph of the symbol of the first PN sequence of the first signal frame；Select the second frame The second PN sequence symbol second segment, wherein, the first PN sequence and the second pseudo noise sequence Dependent of dead military hero is in direct continuous signal frame；First PN sequence is determined based on the circulation cross-correlation of first paragraph and second segment And the second difference between PN sequence；And the first signal frame and/or the second letter are determined based on the difference of determination The frame number of number frame.
  2. 2. according to the method for claim 1, wherein, circulation cross-correlation includes the symbol of first paragraph is corresponding with second segment The complex conjugate multiplication of symbol.
  3. 3. according to the method for claim 1, wherein, the circulation cross-correlation is including the use of Fast Fourier Transform (FFT) (FFT).
  4. 4. the method according to any one of preceding claims, wherein, frame number, which uses, to be used to difference being mapped to frame number Look-up table determine.
  5. 5. the method according to any one of preceding claims, wherein, the frame head is wide according to digital ground multimedia The frame head type PN420 or frame head type PN945 of standard are broadcast to configure.
  6. 6. the method according to any one of preceding claims, wherein, the quantity (N of every section of symbolPER) it is less than frame head PN sequence symbol quantity, especially for the frame head type PN420 of digital ground multimedia broadcast standard For be less than 255 and for the frame head type PN945 of digital ground multimedia broadcast standard be less than 511.
  7. 7. a kind of equipment, particularly digital ground multimedia broadcast receiver either measurement apparatus or analyzer, it is configured To perform the method according to any one of preceding claims.
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