CN1317902A - Orthogonal frequency-division multiplex multi-carrier modulation method for digital television signals - Google Patents

Orthogonal frequency-division multiplex multi-carrier modulation method for digital television signals Download PDF

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CN1317902A
CN1317902A CN 01115515 CN01115515A CN1317902A CN 1317902 A CN1317902 A CN 1317902A CN 01115515 CN01115515 CN 01115515 CN 01115515 A CN01115515 A CN 01115515A CN 1317902 A CN1317902 A CN 1317902A
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carrier modulation
frequency
carrier
digital television
ofdm
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CN1138390C (en
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杨林
杨知行
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Tsinghua University
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Tsinghua University
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Abstract

An orthogonal frequency-division multiplexing multi-carrier modulation method for digitalized TV signals includes converting serial TS code stream to parallel TS code stream, orthogonal phase modulation, perform TDFT, frequency domain interlacing, and parallel-serial conversion. Its advantages are low convergence error and short convergenic time.

Description

The orthogonal frequency-division multiplex multi-carrier modulation method of digital television signal
The digital television signal system of the invention belongs to technical field, the time-domain synchronization OFDM multi-carrier modulation method in particularly a kind of ground digital multimedia TV broad cast system.
For television transmission system, on the basis of simulated television, through insistent research and development of more than ten years, Digital Television Terrestrial Broadcasting (Digital Television Terrestrial Broadcasting, DTTB) obtained a lot of achievements, having reached can implementation phase.From in November, 1998 North America and the Europe DTTB program that started broadcasting, many countries have announced that their DTTB standard selects and realize a plan.At present, mainly contain three kinds of DTTB transmission standards in the world:
1) ATSC of the U.S. (Advanced Television Systems Committee) digital television standard.
2) Ou Zhou DVB-T (Digital Video Terrestrial Broadcasting-Terrestrial) digital video broadcast-terrestrial standard.
3) Ri Ben ISDB-T (Integrated Service Digital Broadcasting-Terrestrial) floor synthetic service digital broadcast standard.
Along with the development of technology and deepening continuously of research, people recognize at signal peak-average power ratio, C/N thresholding, move receive, indoor/outer reception, spectrum efficiency, HDTV transmittability, with frequency/adjacent channel disturb, aspect the flexibility of interference, single frequency network and co-channel forwarding, impulse disturbances and continuous wave interference to having simulated television now, phase noise, static state/dynamically multipath distortion, system or the like, respectively there are its pluses and minuses in above-mentioned three systems.
In signals transmission,, can between receiving symbol, produce intersymbol interference (ISI) because echo disturbs and the linear distortion of channel.
The technology of effectively eliminating ISI at present has two kinds: time domain equalization and OFDM (OFDM).
Time domain equalization generally is to insert a transversal filter (also claiming transversal filter) behind matched filter, and it is made of the delay line of a band tap, and tap is the equal symbol cycle at interval.The time delayed signal of each tap is delivered to an adder circuit output after weighting, its form is identical with finite impulse response filter (FIR), and the signal after the addition is sent to decision circuit through sampling.The weight coefficient of each tap is adjustable, can eliminate ISI by adjusting weight coefficient.The portfolio effect of equalizer is mainly by the decision of tap number and equalization algorithm, and equalization algorithm is commonly used zero forcing algorithm and lowest mean square distortion algorithm etc.Equalizer divides two kinds of presetting system and self-adapting types.Also have noise jamming in actual channel, it can exert an influence to the convergence of equalizer.In order further to improve performance, often adopt decision-feedback formula equalizer in the practical application, the tap coefficient of feedback equalizer is determined by the channel impulse response hangover that forward equalizer caused.
The Digital Television of the U.S. has adopted DFF exactly, and modulation technique has adopted digital 8-VSB mode.
The equalizer techniques comparative maturity is widely used in the various communications fields, but it has two shortcomings: the one, and complex structure, cost is higher; The 2nd, only relatively good to the short ISI effect of time delay, poor to the ISI effect that time delay is long.At this moment, adopt OFDM (OFDM) technology better.
OFDM by in a large number on frequency equally spaced subcarrier constitute (establish total N carrier wave), each carrier wave adopts with a kind of or different modulation systems usually and modulates.The symbol sebolic addressing of serial transmission also is divided into the group that length is N, and every group of N interior symbol sends then together respectively by N subcarrier-modulated.So OFDM essence is a kind of parallel modulation technique.Symbol period is prolonged N doubly, thereby improved resistivity ISI.
How interval between subcarrier is selected, and is the key of OFDM.In traditional frequency division multiplexing, the signal spectrum on each carrier wave is a non-overlapping copies, it is separated with filter so that receive function.But make to have reduced band efficiency like this.In OFDM, for improving band efficiency, the signal spectrum on each carrier wave is overlapped each other, on whole symbol period, be quadrature but the selection in carrier spacing makes these carrier waves, promptly the product of any two carrier waves on symbol period all is zero.Like this, even exist overlappingly between the signal spectrum on each carrier wave, also can restore undistortedly.We know, when intercarrier minimum interval equal symbol cycle reciprocal, can satisfy orthogonality condition.For realizing maximum spectral efficiency, generally get the carrier wave minimum interval inverse in equal symbol cycle.
When symbol was made up of the rectangle time pulse, the frequency spectrum of each carrier signal was the sinx/x shape, and its peak value is seen Fig. 1 corresponding to the zero point of all other carrier spectrums.
Because the bit duration of each carrier wave has been extended N doubly, much larger than general ISI, so OFDM has the performance of good opposing ISI.Under the fixing condition that receives of DVB, when existence very big ISI, the performance of ofdm signal has only the deterioration of 1-2dB.
Because the number of subcarriers in the ofdm system often reaches hundreds of and even several thousand, use hundreds of and even several thousand oscillators or phase-locked loop traditional FDM so can not resemble in the practical application.Through mathematical derivation, find that ofdm signal can obtain with Fourier transformation DFT, N modulation symbol of input passes through N the time-domain sampling value that resulting N data behind the DFT that N orders are exactly required OFDM composite signal, after the D/A conversion, just obtained the ofdm signal waveform.This signal times just can be moved ofdm signal on the required channel with actual carrier.
But when having ISI in the channel, the orthogonality between the OFDM subcarrier can be destroyed, makes receiver can't correctly extract the modulation symbol on each subcarrier.Need to insert a protection interval delta before the cycle at each ofdm signal when practical application, the actual transmissions cycle of OFDM becomes the Ts=T+ Δ for this reason.
Signal in the protection at interval carries out periodic extension by ofdm signal and generates, and is equivalent to the afterbody of ofdm signal catadioptric to the front.When the time delay of ISI was no more than Δ, the orthogonality between the OFDM subcarrier still can keep, and the signal that receiver only extracts in the effective OFDM period T is handled, and ofdm signal just can not be subjected to the interference of ISI.The ability of OFDM opposing ISI depends on the length of Δ, and Δ is long more, and the time delay scope that can eliminate ISI is big more.But it should be noted that in the protection at interval be not transmit useful information, so Δ is big more, the band resource of waste is also many more, and this is that OFDM eliminates the cost that ISI disturbs.
Adopt the OFDM COFDM transmission of coding in the DVB-T system in Europe.In an OFDM Frame, use quaternary PSK (QPSK), 16 grades of quadrature amplitude modulation (16QAM), 64 grades of quadrature amplitude modulation (64QAM), 256 grades of quadrature amplitude modulation (256QAM) of the same Gray code mapping on all carrier waves.Each V bit symbol of exporting from interleaver is mapped to a constellation point in the modulation constellation.
One of the implication of " coding " among the Coded Orthogonal Frequency Division Multiplexing (COFDM) COFDM is meant has inserted some " pilot tone " signals at random in the OFDM frequency spectrum, here so-called " pilot tone " is meant the carrier wave of some OFDM like this, they are by the known data-modulated of receiver, what they transmitted is not modulating data itself, because it is known that these data receivers are systems, the purpose pedal system that pilot tone is set transmits the parameter of some transmitter or the characteristic of test channel by the data on the pilot tone.
The effect of pilot tone in COFDM is very important, and its use comprises: frame synchronization, Frequency Synchronization, time synchronized, channel transfer characteristic are estimated, transmission mode is discerned and follow the tracks of phase noise etc.The data of modulated pilots are the pseudo random sequences that generates from a pseudo-random sequence generator of stipulating in advance.Distribution pilot tone and continuous pilot have been stipulated among the DVB-T.The position of continuous pilot in each COFDM symbol all fixed, and inserted 177 continuous pilot in the 8k pattern, inserted 45 continuous pilot in the 2k pattern.The position of scattering pilot tone is different in different COFDM symbols, but with four COFDM symbols is loop cycle, that is to say the 1st, 2,3, the position of the distribution pilot tone in 4 COFDM symbols has nothing in common with each other, but the 5th COFDM symbol is identical with pilot frequency locations in the 1st the OFDM symbol, the 6th COFDM symbol is identical with pilot frequency locations in the 2nd the COFDM symbol, the 7th COFDM symbol is identical with pilot frequency locations in the 3rd the COFDM symbol, the 8th COFDM symbol is identical with pilot frequency locations in the 4th the COFDM symbol, and the rest may be inferred for all the other COFDM symbols.
No matter how the position of pilot tone changes, the number that is used to transmit the carrier wave of effective programme information in each COFDM symbol all is constant, is 1512 in the 2k pattern, is 6048 in the k pattern.Because the effect of pilot tone in system is important, for guaranteeing the reliability of data on the pilot tone, prevent noise jamming, the average power of pilot signal is bigger 16/9 times than the average power of other carrier signal, and promptly pilot signal is launched on " lifting " power level.
But because DFT and pilot tone are mutual demands in COFDM, pilot tone is inserted after DFT, and DFT calculates and needs (pilot tone) at first synchronously, could calculate DFT then.Therefore, COFDM adopts the iterative approach algorithm, and this method convergence error is big, and convergence time is long.
The objective of the invention is provides a kind of orthogonal frequency-division multiplex multi-carrier modulation method of digital television signal for overcoming the weak point of prior art.Wherein adopted time-domain synchronous orthogonal frequency division multi-carrier modulation technology, it is the scheme that a kind of time-domain and frequency-domain mixes.In this scheme, do not insert the COFDM pilot signal, but utilized spread spectrum, be used for frame synchronization, Frequency Synchronization, time synchronized, channel transfer characteristic estimation and follow the tracks of phase noise etc.It is little to make it have a convergence error, the advantage that convergence time is short.
The orthogonal frequency-division multiplex multi-carrier modulation method of digital television signal of the present invention is characterized in that it comprises the following steps:
(a) serial transmission code stream (TS) is gone here and there and change, make it to become parallel TS code stream, constitute a quadrature
The frequency-division multiplex multi-carrier modulation symbol;
(b) above-mentioned parallel TS code stream is carried out the quadrature phase modulation;
(c) data after will modulating disperse and pay a upright leaf inverse transformation (IDFT), obtain OFDM multi-carrier and transfer
The subcarrier of system;
(d) the discrete frequency domain data of paying upright leaf inverse transformation (IDFT) of above-mentioned process is carried out frequency-domain-interleaving;
(e) frequency domain data after will interweaving carries out and goes here and there conversion.
Orthogonal frequency-division multiplex multi-carrier modulation method according to above-mentioned digital television signal is characterized in that: the length of described OFDM multi-carrier modulation symbol is T s=500 microseconds, the frequency interval of the subcarrier of promptly described OFDM multi-carrier modulation is 2KHz.
Orthogonal frequency-division multiplex multi-carrier modulation method according to above-mentioned digital television signal, it is characterized in that: the bandwidth of described OFDM multi-carrier modulation signal is in 7.5MHz～8.0MHz scope, and the span of the sub-carrier number k of promptly described OFDM multi-carrier modulation is between 3750～4000.
Orthogonal frequency-division multiplex multi-carrier modulation method according to above-mentioned digital television signal is characterized in that: the sub-carrier number k=3780 of described OFDM multi-carrier modulation.
OFDM multi-carrier modulation transmission method according to above-mentioned digital television signal is characterized in that: in above-mentioned steps (d) before, increase following step:
(f) frequency domain data of the anti-phase discrete fourier transition of above-mentioned process (IDFT) is increased protection at interval, described protection be spaced apart the DFT block size 1/6,1/9,1/12,1/20 and 1/30 in one.
Orthogonal frequency-division multiplex multi-carrier modulation method according to above-mentioned digital television signal is characterized in that: described quadrature phase is modulated to one of QPSK, 16QAM, 64QAM, 256QAM modulation system.
Characteristics of the present invention and effect:
Utilize the orthogonal frequency-division multiplex multi-carrier modulation method of digital television signal of the present invention, its spectrum efficiency can be up to 4 Bit/s/Hz.
Because the OFDM carrier number of European DVB-T is k=1705 (2k pattern) or k=6817 (8k pattern), can not carry out the factor decomposition or decompose the back radix very big, in order to raise the efficiency, Europe DVB-T system can only be by after the zero padding, adopt 2 integral number power to carry out the FFT computing again, therefore reduced operation efficiency.Under the 8k pattern, to come the data of 6817 points are carried out computing with the FFT of 8192 points, its efficient is 83%, and is 100% according to the FFT efficient of orthogonal frequency-division multiplex multi-carrier modulation method of the present invention, DMB-T is higher than the FFT operation efficiency of DVB-T.In addition, DVB-T does like this, and the speed of FFT computing just must be higher than data rate.Particularly at demodulating end, just must be higher than data rate owing to do the speed of FFT computing like this, be not equal to Nyquist rate, the result will can finish demodulation through carrying out complicated interpolative operation.And there is not this problem in well-designed 3780 carrier numbers of the process that TDS-OFDM adopted.
According to orthogonal frequency-division multiplex multi-carrier modulation method of the present invention, not only can be used for ground, satellite, wired, microwave and other transmission medium, also can be used for data broadcasting, Internet and other wideband multimedia message transmission and integrated data business field.
Brief Description Of Drawings:
Fig. 1 is the schematic diagram of the multicarrier frequency spectrum of OFDM multi-carrier modulation.
Fig. 2 is the schematic diagram that is used to represent according to the structure of a signal frame of the OFDM multi-carrier modulation signal of digital television signal of the present invention.
Fig. 3 is the block diagram of the orthogonal frequency-division multiplex multi-carrier modulation method of explanation digital television signal of the present invention.
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail:
According to orthogonal frequency-division multiplex multi-carrier modulation method of the present invention, its signal mainly comprises time-domain synchronous head and signal frame body.
The baseband signal of frame is an OFDM (OFDM) piece.An OFDM piece can further be divided into protection interval and a DFT piece, as shown in Figure 2.
According to the orthogonal frequency-division multiplex multi-carrier modulation method embodiment of digital television signal of the present invention, as shown in Figure 3, it comprises the following steps:
(a) serial TS code stream is gone here and there and change, make it to become parallel TS code stream;
(b) above-mentioned parallel TS code stream is carried out the quadrature phase modulation;
(c) data after will modulating are carried out anti-phase discrete fourier transition (IDFT);
(d) frequency domain data with the anti-phase discrete fourier transition of above-mentioned process (IDFT) carries out frequency-domain-interleaving;
(e) frequency domain data after will interweaving carries out and goes here and there conversion.
In order to increase its ISI performance, can increase following step in above-mentioned steps (d) before:
(f) frequency domain data of the anti-phase discrete fourier transition of above-mentioned process (IDFT) is increased protection at interval, described protection be spaced apart the DFT block size 1/6,1/9,1/12,1/20 and 1/30 in one.
Described quadrature phase is modulated to one of QPSK, 16QAM, 640AM, 256QAM modulation system.
Choosing of the sub-carrier number of the OFDM multi-carrier modulation of present embodiment:
It is more to influence the factor that the OFDM carrier number selects, for example frequency domain resolution, time domain OFDM symbol lengths, take the effective bandwidth of television channel etc., and these factors are interrelated.So, need at first certain parameter is wherein decided, could further calculate other parameter then.
By a large amount of experiments, prove that following selection is more satisfactory.
At first the length of an OFDM is fixed as T s=500 microseconds, from the definition of DFT, the inverse of the length of OFDM symbol (cycle) is exactly the frequency interval of subcarrier, and the frequency interval that obtains the OFDM subcarrier thus is Δ F=1/500us=2Khz.
In order to make full use of the 8Mhz spectral bandwidth of TV, take into account the realization difficulty or ease that are output into mode filter at last simultaneously, the baseband bandwidth scope of ofdm signal should be 7.5MHz＜k * Δ F＜8MHz, and just the span of OFDM sub-carrier number k is between 3750～4000.
Last definite chooser carrier number k also will consider to be convenient to the quick realization of IDFT and DFT.For obtaining whole DFT coefficients, directly calculating N point DFT needs N 2The inferior complex addition of inferior complex multiplication and N (N-1), the calculated data amount is very big, must adopt quick DFT algorithm (FFT) to reduce calculation times.The basic principle of FFT is decomposed into the comprehensive of a succession of simple FFT computing with DFT.In theory, the radix of N decomposition is few more good more.In 3750～4000 above-mentioned scopes, through seeking relatively, the sub-carrier number that finally can determine the OFDM symbol is 3780.At this moment, the baseband bandwidth of signal is 2KHz * 3780=7.56MHz.
In a word, time domain DFT piece is by 3780 sampling expressions, and these samplings also are called the Nyquist sampling, and this is under the 8Mhz television bandwidth, and time domain and frequency domain mix best Nyquist sampling to be realized.
The symbol protection selection at interval of the OFDM multi-carrier modulation of present embodiment:
In time domain DFT piece, insert protection and formed frame at interval.Be separated with 5 kinds of mode of operations between protection, they are defined as 1/6,1/9,1/12,1/20 and 1/30 of DFT block size, and are as shown in table 1.The final stage sampling of time domain DFT piece is used as protection at interval.The protection blanking time under different protection gap size about 83.3us between the 16.7us.
Symbolic number in OFDM piece of table 1
Symbolic number in the OFDM piece The percentage of the at interval relative DFT piece of protection Symbolic number in the protection at interval
????4410 ????1/6 ????630
????4200 ????1/9 ????420
????4095 ????1/12 ????315
????3969 ????1/20 ????189
????3906 ????1/30 ????126
Because the OFDM block protection is different at interval, has the OFDM piece of 3780 subcarriers that different number of samples (referring to table 1) is arranged corresponding to frequency domain in time domain.
The selection of modulation system on the subcarrier of present embodiment:
On each subcarrier, use the MQAM modulation in conjunction with FEC, modulation system be chosen as the support Delamination Transmission, can be the non-homogeneous 64QAM symbol constellation of non-homogeneous 16QAM of QPSK, 16QAM/ or 64QAM/; Modulation and coded system (coding in the OFDM symbol, ISN) can be to select among lattice shape 64QAM, lattice shape 16QAM, lattice shape QPSK, turbo 64QAM, turbo 16QAM, the turbo lattice shape QPSK.
Present embodiment to carrying out the interweave specific implementation of (interweaving in being called again) of matrix in the OFDM symbol:
Symbol according to the form below 2 in IDFT piece interweaves, and is the equal of frequency-domain-interleaving, and wherein first row are that size is the input data in 3780 multiplexing and the symbol sequence number of control signal.Frequency-domain-interleaving can effectively overcome frequency selective fading.
Table 2 IDFT symbol interleaving mapping table
The input signal sequence number Frequency sequence number in the IDFT piece
0000????0000??0540??1080??1620??2160??2700??3240??0108??0648??11880010????1728??2268??2808??3348??0216??0756??1296??1836??2376??29160020????3456??0324??0864??1404??1944??2484??3024??3564??0432??09720030????1512??2052??2592??3132??3672??0054??0594??1134??1674??22140040????2754??3294??0162??0702??1242??1782??2322??2862??3402??02700050??0810??1350??1890??2430??2970??3510??0378??0918??1458??19980060??2538??3078??3618??0486??1026??1566??2106??2646??3186??37260070??0027??0567??1107??1647??2187??2727??3267??0135??0675??12150080??1755??2295??2835??3375??0243??0783??1323??1863??2403??29430090??3483??0351??0891??1431??1971??2511??3051??3591??0459??09990100??1539??2079??2619??3159??3699??0081??0621??1161??1701??22410110??2781??3321??0189??0729??1269??1809??2349??2889??3429??02970120??0837??1377??1917??2457??2997??3537??0405??0945??1485??20250130??2565??3105??3645??0513??1053??1593??2133??2673??3213??37530140??0009??0549??1089??1629??2169??2709??3249??0117??0657??11970150??1737??2277??2817??3357??0225??0765??1305??1845??2385??29250160??3465??0333??0873??1413??1953??2493??3033??3573??0441??09810170??1521??2061??2601??3141??3681??0063??0603??1143??1683??22230180??2763??3303??0171??0711??1251??1791??2331??2871??3411??02790190??0819??1359??1899??2439??2979??3519??0387??0927??1467??20070200??2547??3087??3627??0495??1035??1575??2115??2655??3195??37350210??0036??0576??1116??1656??2196??2736??3276??0144??0684??12240220??1764??2304??2844??3384??0252??0792??1332??1872??2412??29520230??3492??0360??0900??1440??1980??2520??3060??3600??0468??10080240??1548??2088??2628??3168??3708??0090??0630??1170??1710??22500250??2790??3330??0198??0738??1278??1818??2358??2898??3438??03060260??0846??1386??1926??2466??3006??3546??0414??0954??1494??20340270??2574??3114??3654??0522??1062??1602??2142??2682??3222??37620280??0018??0558??1098??1638??2178??2718??3258??0126??0666??12060290??1746??2286??2826??3366??0234??0774??1314??1854??2394??29340300??3474??0342??0882??1422??1962??2502??3042??3582??0450??09900310??1530??2070??2610??3150??3690??0072??0612??1152??1692??22320320??2772??3312??0180??0720??1260??1800??2340??2880??3420??02880330??0828??1368??1908??2448??2988??3528??0396??0936??1476??20160340??2556??3096??3636??0504??1044??1584??2124??2664??3204??37440350??0045??0585??1125??1665??2205??2745??3285??0153??0693??12330360??1773??2313??2853??3393??0261??0801??1341??1881??2421??29610370??3501??0369??0909??1449??1989??2529??3069??3609??0477??10170380??1557??2097??2637??3177??3717??0099??0639??1179??1719??22590390??2799??3339??0207??0747??1287??1827??2367??2907??3447??03150400??0855??1395??1935??2475??3015??3555??0423??0963??1503??20430410??2583??3123??3663??0531??1071??1611??2151??2691??3231??37710420??0003??0543??1083??1623??2163??2703??3243??0111??0651??11910430??1731??2271??2811??3351??0219??0759??1299??1839??2379??29190440??????3459??0327??0867??1407??1947??2487??3027??3567??0435??09750450??????1515??2055??2595??3135??3675??0057??0597??1137??1677??22170460??????2757??3297??0165??0705??1245??1785??2325??2865??3405??02730470??????0813??1353??1893??2433??2973??3513??0381??0921??1461??20010480??????2541??3081??3621??0489??1029??1569??2109??2649??3189??37290490??????0030??0570??1110??1650??2190??2730??3270??0138??0678??12180500??????1758??2298??2838??3378??0246??0786??1326??1866??2406??29460510??????3486??0354??0894??1434??1974??2514??3054??3594??0462??10020520??????1542??2082??2622??3162??3702??0084??0624??1164??1704??22440530??????2784??3324??0192??0732??1272??1812??2352??2892??3432??03000540??????0840??1380??1920??2460??3000??3540??0408??0948??1488??20280550??????2568??3108??3648??0516??1056??1596??2136??2676??3216??37560560??????0012??0552??1092??1632??2172??2712??3252??0120??0660??12000570??????1740??2280??2820??3360??0228??0768??1308??1848??2388??29280580??????3468??0336??0876??1416??1956??2496??3036??3576??0444??09840590??????1524??2064??2604??3144??3684??0066??0606??1146??1686??22260600??????2766??3306??0174??0714??1254??1794??2334??2874??3414??02820610??????0822??1362??1902??2442??2982??3522??0390??0930??1470??20100620??????2550??3090??3630??0498??1038??1578??2118??2658??3198??37380630??????0039??0579??1119??1659??2199??2739??3279??0147??0687??12270640??????1767??2307??2847??3387??0255??0795??1335??1875??2415??29550650??????3495??0363??0903??1443??1983??2523??3063??3603??0471??10110660??????1551??2091??2631??3171??3711??0093??0633??1173??1713??22530670??????2793??3333??0201??0741??1281??1821??2361??2901??3441??03090680??????0849??1389??1929??2469??3009??3549??0417??0957??1497??20370690??????2577??3117??3657??0525??1065??1605??2145??2685??3225??37650700??????0021??0561??1101??1641??2181??2721??3261??0129??0669??12090710??????1749??2289??2829??3369??0237??0777??1317??1857??2397??29370720??????3477??0345??0885??1425??1965??2505??3045??3585??0453??09930730??????1533??2073??2613??3153??3693??0075??0615??1155??1695??22350740??????2775??3315??0183??0723??1263??1803??2343??2883??3423??02910750??????0831??1371??1911??2451??2991??3531??0399??0939??1479??20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Claims (7)

1, a kind of orthogonal frequency-division multiplex multi-carrier modulation method of digital television signal is characterized in that, it comprises following
Step:
(a) serial TS code stream is gone here and there and change, make it to become and close row TS code stream, constitute an orthogonal frequency division multiplexing
Use the multi-carrier modulation symbol;
(b) above-mentioned parallel TS code stream is carried out the quadrature phase modulation;
(c) data after will modulating are carried out anti-phase discrete fourier transition, obtain the OFDM multi-carrier modulation
Subcarrier;
(d) frequency domain data with the anti-phase discrete fourier transition of above-mentioned process carries out frequency-domain-interleaving;
(e) frequency domain data after will interweaving carries out and goes here and there conversion.
2, according to the orthogonal frequency-division multiplex multi-carrier modulation method of the digital television signal of claim 1, it is characterized in that: the length of described OFDM multi-carrier modulation symbol is T s=500 microseconds, the frequency interval of the subcarrier of promptly described OFDM multi-carrier modulation is 2KHz.
3, according to the orthogonal frequency-division multiplex multi-carrier modulation method of claim 1,2 digital television signal, it is characterized in that: the baseband signal bandwidth of described OFDM multi-carrier modulation signal is in 7.5MHz ~ 8.0MHz scope, and the span of the sub-carrier number k of promptly described OFDM multi-carrier modulation is between 3750 ~ 4000.
4, according to the orthogonal frequency-division multiplex multi-carrier modulation method of the digital television signal of claim 3, it is characterized in that: the sub-carrier number k=3780 of described OFDM multi-carrier modulation.
5, according to the OFDM multi-carrier modulation transmission method of the digital television signal of claim 1, it is characterized in that: in above-mentioned steps (d) before, increase following step:
(f) frequency domain data of the anti-phase discrete fourier transition of above-mentioned process (IDFT) is increased protection at interval, described protection be spaced apart the DFT block size 1/6,1/9,1/12,1/20 and 1/30 in one.
6, according to the orthogonal frequency-division multiplex multi-carrier modulation method of the digital television signal of claim 1, it is characterized in that: described quadrature phase is modulated to one of quaternary PSK modulation, 16 grades of quadrature amplitude modulation, 64 grades of quadrature amplitude modulation, 256 grades of quadrature amplitude modulation modes.
7, according to the orthogonal frequency-division multiplex multi-carrier modulation method of the digital television signal of claim 2, it is characterized in that: described frequency-domain-interleaving be mapped as following table:
IDFT symbol interleaving mapping table The input signal sequence number Frequency sequence number in the IDFT piece
0000??0000??0540??1080??1620??2160??2700??3240??0108??0648??11880010??1728 2268??2808??3348??0216??0756??1296??1836??2376??29160020??3456??0324??0864??1404??1944??2484??3024??3564??0432??09720030??1512??2052??2592??3132??3672??0054??0594??1134??1674??22140040??2754??3294??0162??0702??1242??1782??2322??2862??3402??02700050??0810??1350??1890??2430??2970??3510??0378??0918??1458??19980060??2538??3078??3618??0486??1026??1566??2106??2646??3186??37260070??0027??0567??1107??1647??2187??2727??3267??0135??0675??12150080??1755??2295??2835??3375??0243??0783??1323??1863??2403??29430090??3483??0351??0891??1431??1971??2511??3051??3591??0459??09990100??1539??2079??2619??3159??3699??0081??0621??1161??1701??22410110??2781??3321??0189??0729??1269??1809??2349??2889??3429??02970120??0837??1377??1917??2457??2997??3537??0405??0945??1485??20250130??2565??3105??3645??0513??1053??1593??2133??2673??3213??37530140??0009??0549??1089??1629??2169??2709??3249??0117??0657??11970150??1737??2277??2817??3357??0225??0765??1305??1845??2385??29250160??3465??0333??0873??1413??1953??2493??3033??3573??0441??09810170??1521??2061??2601??3141??3681??0063??0603??1143??1683??22230180??2763??3303??0171??0711??1251??1791??2331??2871??3411??02790190??0819??1359??1899??2439??2979??3519??0387??0927??1467??20070200??2547??3087??3627??0495??1035??1575??2115??2655??3195??37350210??0036??0576??1116??1656??2196??2736??3276??0144??0684??12240220??1764??2304??2844??3384??0252??0792??1332??1872??2412??29520230??3492??0360??0900??1440??1980??2520??3060??3600??0468??10080240??1548??2088??2628??3168??3708??0090??0630??1170??1710??22500250??2790??3330??0198??0738??1278??1818??2358??2898??3438??03060260??0846??1386??1926??2466??3006??3546??0414??0954??1494??20340270??2574??3114??3654??0522??1062??1602??2142??2682??3222??37620280??0018??0558??1098??1638??2178??2718??3258??0126??0666??12060290??1746??2286??2826??3366??0234??0774??1314??1854??2394??29340300??3474??0342??0882??1422??1962??2502??3042??3582??0450??09900310??1530??2070??2610??3150??3690??0072??0612??1152??1692??22320320??2772??3312??0180??0720??1260??1800??2340??2880??3420??02880330??0828??1368??1908??2448??2988??3528??0396??0936??1476??20160340??2556??3096??3636??0504??1044??1584??2124??2664??3204??37440350??0045??0585??1125??1665??2205??2745??3285??0153??0693??12330360??1773??2313??2853??3393??0261??0801??1341??1881??2421??29610370??3501??0369??0909??1449??1989??2529??3069??3609??0477??10170380??1557??2097??2637??3177??3717??0099??0639??1179??1719??22590390??2799??3339??0207??0747??1287??1827??2367??2907??3447??03150400??0855??1395??1935??2475??3015??3555??0423??0963??1503??20430410??2583??3123??3663??0531??1071??1611??2151??2691??3231??37710420??0003??0543??1083??1623??2163??2703??3243??0111??0651??11910430??1731??2271??2811??3351??0219??0759??1299??1839??2379??29190440??3459??0327??0867??1407??1947??2487??3027??3567??0435??09750450??1515??2055??2595??3135??3675??0057??0597??1137??1677??22170460??2757??3297??0165??0705??1245??1785??2325??2865??3405??02730470??0813??1353??1893??2433??2973??3513??0381??0921??1461??20010480??2541??3081??3621??0489??1029??1569??2109??2649??3189??37290490??0030??0570??1110??1650??2190??2730??3270??0138??0678??12180500??1758??2298??2838??3378??0246??0786??1326??1866??2406??29460510??3486??0354??0894??1434??1974??2514??3054??3594??0462??10020520??1542??2082??2622??3162??3702??0084??0624??1164??1704??22440530??2784??3324??0192??0732??1272??1812??2352??2892??3432??03000540??0840??1380??1920??2460??3000??3540??0408??0948??1488??20280550??2568??3108??3648??0516??1056??1596??2136??2676??3216??37560560??0012??0552??1092??1632??2172??2712??3252??0120??0660??12000570??1740??2280??2820??3360??0228??0768??1308??1848??2388??29280580??3468??0336??0876??1416??1956??2496??3036??3576??0444??09840590??1524??2064??2604??3144??3684??0066??0606??1146??1686??22260600??2766??3306??0174??0714??1254??1794??2334??2874??3414??02820610??0822??1362??1902??2442??2982??3522??0390??0930??1470??20100620??2550??3090??3630??0498??1038??1578??2118??2658??3198??37380630??0039??0579??1119??1659??2199??2739??3279??0147??0687??12270640??1767??2307??2847??3387??0255??0795??1335??1875??2415??29550650??3495??0363??0903??1443??1983??2523??3063??3603??0471??10110660??1551??2091??2631??3171??3711??0093??0633??1173??1713??22530670??2793??3333??0201??0741??1281??1821??2361??2901??3441??03090680??0849??1389??1929??2469??3009??3549??0417??0957??1497??20370690??2577??3117??3657??0525??1065??1605??2145??2685??3225??37650700??0021??0561??1101??1641??2181??2721??3261??0129??0669??12090710??1749??2289??2829??3369??0237??0777??1317??1857??2397??29370720??3477??0345??0885??1425??1965??2505??3045??3585??0453??09930730??1533??2073??2613??3153??3693??0075??0615??1155??1695??22350740??2775??3315??0183??0723??1263??1803??2343??2883??3423??02910750??0831??1371??1911??2451??2991??3531??0399??0939??1479??20190760??2559??3099??3639??0507??1047??1587??2127??2667??3207??37470770??0048??0588??1128??1668??2208??2748??3288??0156??0696??12360780??1776??2316??2856??3396??0264??0804??1344??1884??2424??29640790??3504??0372??09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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100380957C (en) * 2002-06-17 2008-04-09 三星电子株式会社 Orthogonal frequency division multiplexing transmitter with modified pseudo-random noise sequence and inserted code element
CN101257470B (en) * 2008-01-18 2010-09-08 清华大学 Method for using insertion pilot to inhibit phase noise in orthogonal frequency division multiplexing system
CN101312510B (en) * 2008-05-29 2010-09-15 北京创毅视讯科技有限公司 Modulation data conversion unit and modulation data conversion method
CN1925474B (en) * 2005-08-29 2010-11-10 中国科学院上海微系统与信息技术研究所 Single carrier frequency-division multi-address transmitting, receiving device based on multiple subband wave filter set and method thereof
CN101136731B (en) * 2007-08-09 2011-08-31 复旦大学 Method for eliminating phase noise using continuous transmission parameter signalling
CN107340419A (en) * 2017-07-19 2017-11-10 福建师范大学福清分校 MC1496 Modulation and Amplitude Modulations combined-voltage is superimposed coefficient determination method
CN107948611A (en) * 2017-12-22 2018-04-20 深圳广视航拍有限公司 Wireless data transmission method and its system based on multicarrier

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100380957C (en) * 2002-06-17 2008-04-09 三星电子株式会社 Orthogonal frequency division multiplexing transmitter with modified pseudo-random noise sequence and inserted code element
CN1925474B (en) * 2005-08-29 2010-11-10 中国科学院上海微系统与信息技术研究所 Single carrier frequency-division multi-address transmitting, receiving device based on multiple subband wave filter set and method thereof
CN101136731B (en) * 2007-08-09 2011-08-31 复旦大学 Method for eliminating phase noise using continuous transmission parameter signalling
CN101257470B (en) * 2008-01-18 2010-09-08 清华大学 Method for using insertion pilot to inhibit phase noise in orthogonal frequency division multiplexing system
CN101312510B (en) * 2008-05-29 2010-09-15 北京创毅视讯科技有限公司 Modulation data conversion unit and modulation data conversion method
CN107340419A (en) * 2017-07-19 2017-11-10 福建师范大学福清分校 MC1496 Modulation and Amplitude Modulations combined-voltage is superimposed coefficient determination method
CN107340419B (en) * 2017-07-19 2023-08-01 福建技术师范学院 MC1496 amplitude modulation AC/DC voltage superposition coefficient determination method
CN107948611A (en) * 2017-12-22 2018-04-20 深圳广视航拍有限公司 Wireless data transmission method and its system based on multicarrier

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