CN1487741A - Multi-carrier transmitting system and method with frequeney-domain pilot signal and hidden pilot signal - Google Patents

Multi-carrier transmitting system and method with frequeney-domain pilot signal and hidden pilot signal Download PDF

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Publication number
CN1487741A
CN1487741A CNA03108690XA CN03108690A CN1487741A CN 1487741 A CN1487741 A CN 1487741A CN A03108690X A CNA03108690X A CN A03108690XA CN 03108690 A CN03108690 A CN 03108690A CN 1487741 A CN1487741 A CN 1487741A
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China
Prior art keywords
signal
hiding
pilot signal
pilot
ofdm
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CNA03108690XA
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Chinese (zh)
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CN1251496C (en
Inventor
朴赞燮
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0022—PN, e.g. Kronecker
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • H04L1/0042—Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
    • 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
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain

Abstract

A COFDM(Coded Orthogonal Frequency Division Multiplexing) transmitting system adding a pilot signal to a frequency domain and a signal processing method thereof are provided to set the pilot signal inserted in the frequency domain very low, thereby improving receiving efficiency and having compatibility with an existing system. An FEC(Forward Error Correction) unit codes signals of a frequency domain for a receiving party to detect and correct an error. A mapping unit(310) maps the coded signals of the frequency domain by using a predetermined mapping method. A frame forming unit(320) inserts a first pilot signal to the signals of the frequency domain and forms OFDM frame signals formatted according to transmission modes. A pilot insertion unit(330) adds a second pilot signal having a relatively small size compared with an average size of the OFDM signals of the frequency domain to the OFDM frame signals. An IFFT(Inverse Fast Fourier Transform) unit(340) performs IFFT for the OFDM frame signals of the frequency domain to transform the IFFTed frame OFDM signals into OFDM signals of a time domain. A GI(Guard Interval) insertion unit(350) inserts a GI in the OFDM signals of the time domain.

Description

Multicarrier transmitting system and method with pilot tone and hiding pilot signal
Technical field
The present invention relates to digit broadcasting system, more particularly, relate to the multicarrier transmitting system and the signal processing method thereof that adopt OFDM (OFDM), can improve receptivity.
Background technology
Under multipath and mobile reception environment, OFDM is a kind of multi-carrier modulation method with superperformance.
The OFDM method adopts mutually orthogonal a plurality of carrier waves to increase frequency utilization efficient.When the multicarrier method was used for wired or wireless passage, the OFDM method was suitable for high data rate and sends.When the single carrier method being used for send when having the high-speed data of short mark space,, thereby the complexity of receiving terminal is sharply increased because intersymbol interference becomes seriously by wireless communication with multipath decline.
A plurality of mutually orthogonal carrier waves are used for the OFDM method increases frequency utilization efficient.Can carry out modulating/demodulating to these carrier waves at high speed at transmission/receiving terminal by carrying out the IFFT/FFT (invert fast fourier transformation/fast fourier transform) that can obtain and carry out IDFT/DFT (inverse discrete Fourier transformer inverse-discrete/discrete Fourier transform (DFT)) same effect.
As the COFDM modulator approach in the above-mentioned OFDM method of DVB-T (digital video broadcast-terrestrial) employing of one of European standards for digital broadcasting.The characteristics of using multicarrier once to send the COFDM method of a plurality of data are, it is very good and can realize moving and receive that it moves under multi-path environment.
Fig. 1 illustrates the schematic block diagram of traditional DVB-T transmitting system.
This DVB-T transmitting system comprises FEC (forward error correction) unit 10, map unit 20, frame forming unit 30, IFFT unit 40, protects and insert unit 50 and RF (radio frequency) unit 60 at interval.
FEC unit 10 is carried out RS (Reed-Solomon) coding and convolutional encoding usually, is used for data are encoded, so that receiving terminal carries out EDC error detection and correction.
Map unit 20 is mapped as QPSK (quaternary PSK), 16QAM (quadrature amplitude modulation), 64QAM etc. with coded data.
Frame forming unit 30 is inserted into pilot tone in the data and generates the frame that is used to send.The pilot tone of being added can be scattered pilot, continuous pilot and the TPS (transmission parameter signal) that is used for synchronization acquistion and channel-equalization.TPS carries following 6 information:
1) style information of qam constellation (constellation);
2) hierarchical information;
3) GI (protection at interval) length information;
4) in-line coding speed;
5) 2K or 8K sending mode;
6) frame number.
IFFT is carried out in IFFT unit 40, and frequency domain ofdm signal is transformed to time domain OFDM signal.
Unit 50 is inserted at interval in protection will be inserted into the ofdm signal front from the GI of the afterbody intercepting of the ofdm signal of modulation, to prevent the ISI (intersymbol interference) under the multi-path environment.
RF unit 60 sends ofdm signal by radio channel on the frequency band of expectation.
The DVB-T transmitting system is added a plurality of pilot tones in the OFDM frame signal to, is used for the synchronization acquistion and the channel-equalization of receiving terminal.Fig. 2 is illustrated in the structure that forms the ofdm signal frame in each sending mode of DVB-T transmitting system, and each ofdm signal frame includes pilot signal.In fact, the DVB-T receiving system only use this pilot signal carry out channel-equalization and frequency domain synchronous, cause the performance of receiving system limited and descend thus.
Summary of the invention
The objective of the invention is the defective that addresses the above problem at least and/or exist, and can bring following at least advantage.
Therefore, the objective of the invention is to address the above problem by providing a kind of extra hiding pilot signal is added to improve multicarrier transmitting system and the signal processing method thereof that receptivity also can be compatible mutually with traditional multicarrier transmitting system in the frequency domain.
According to an aspect of the present invention, provide a kind of multicarrier transmitting system, comprising: the FEC unit is used for frequency domain ofdm signal is encoded, so that the receiving terminal EDC error detection and correction; Map unit is used to shine upon coded frequency domain ofdm signal; The frame forming unit is used for first pilot signal is inserted into frequency-region signal, to generate at the formed OFDM frame signal of each sending mode; Pilot plug-in unit is used for the hiding pilot signal that the average power of power ratio OFDM frame signal is low and adds the OFDM frame signal to; The IFFT unit is used for by carrying out IFFT the frequency-domain OFDM frame signal being modulated to time domain OFDM signal; And protect at interval and insert the unit, be used for inserting protection at interval in the time domain OFDM signal front.
First pilot signal is scattered pilot, the continuous pilot that receiving terminal is used for synchronization acquistion and channel-equalization information, and at the TPS of each sending mode as system information.
The OFDM frame signal has I signal and Q signal, and hiding pilot signal has the hiding I pilot signal and the hiding Q pilot signal of adding I signal and Q signal respectively to.
The power of hiding the I pilot signal is provided with in the following manner, that is, the cumulative power of the hiding I pilot signal of predetermined quantity is than the average power height of I signal; The power of hiding the Q pilot signal is provided with in the following manner, that is, the cumulative power of the hiding Q pilot signal of predetermined quantity is than the average power height of Q signal.
The hiding I pilot signal of adding I signal and Q signal to has identical with I signal and Q signal respectively symbol time with hiding Q pilot signal.
Hiding pilot signal is a synchronizing information.
According to a further aspect in the invention, provide a kind of signal processing method of multicarrier transmitting system, comprise step: frequency-region signal is encoded, so that the receiving terminal EDC error detection and correction; Shine upon coded frequency-region signal; First pilot signal is inserted in the frequency-region signal, to generate at the formed OFDM frame signal of each sending mode; The hiding pilot signal that the average power of power ratio OFDM frame signal is low is added in the OFDM frame signal; By carrying out IFFT, the frequency-domain OFDM frame signal is modulated to time domain OFDM signal; And at interval in the insertion protection of time domain OFDM signal front.
First pilot signal is scattered pilot, the continuous pilot that receiving terminal is used for synchronization acquistion and channel-equalization information, and at the TPS of each sending mode as system information.
The OFDM frame signal has I signal and Q signal, and hiding pilot signal has the hiding I pilot signal and the hiding Q pilot signal of adding I signal and Q signal respectively to.
The power of hiding the I pilot signal is provided with in the following manner, that is, the cumulative power of the hiding I pilot signal of predetermined quantity is than the average power height of I signal; The power of hiding the Q pilot signal is provided with in the following manner, that is, the cumulative power of the hiding Q pilot signal of predetermined quantity is than the average power height of Q signal.
The hiding I pilot signal of adding I signal and Q signal to has identical with I signal and Q signal respectively symbol time with hiding Q pilot signal.
Hiding pilot signal is a synchronizing information.
Other advantage of the present invention, purpose and characteristics will be set forth in the following description, and for a person skilled in the art, by studying following explanation or specifically putting into practice the present invention, it is clearer that said circumstances will become.As pointed in the appended claims, can realize and reach objects and advantages of the present invention.
Description of drawings
Describe the present invention with reference to following accompanying drawing, wherein, identical reference number is represented identical parts.
Fig. 1 illustrates the schematic block diagram of traditional DVB-T (adopting COFDM) transmitting system;
Fig. 2 shows the structure of the ofdm signal in the DVB-T transmitting system of Fig. 1;
Fig. 3 illustrates the schematic block diagram according to the DVB-T transmitting system of employing COFDM of the present invention;
Fig. 4 shows the structure of ofdm signal of the DVB-T transmitting system of Fig. 3;
The pilot signal that Fig. 5 illustrates the notion of adding mapping signal and added by the pilot plug-in unit of Fig. 3; And
Fig. 6 illustrates the flow chart of signal processing method of the DVB-T transmitting system of Fig. 3.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
DVB-T system towards Europe has following characteristics:
1) uses the COFDM modulator approach;
2) except non-layered signal sending mode and layering sending mode, also extra support non-layered is mixed sending mode, and adopts different frame structures under each pattern;
3) except 2K and 8K pattern, also support the 4K pattern; And
4) possess in the frequency domain synchronously, be used to realize to send and receiving terminal between synchronously.
Fig. 3 illustrates the schematic block diagram of the DVB-T transmitting system that adopts the COFDM method.
This DVB-T transmitting system comprises separator 100, FEC (forward error correction) unit 200 and OFDM modulator 300.
Separator 100 is separated into high-order code stream and low level code stream with input code flow, and they are outputed to FEC unit 200.
FEC unit 200 comprises and is used for carrying out scrambler 210, the outer encoder 220 that is used to carry out RS (Reed-Solomon) coding add around (scramble), is used to the inner encoder 240 carrying out the external interleaver 230 of convolutional interleave and be used to carry out in-line coding.FEC unit 200 also comprises interleaver 250, with extension system have the position interleaver 251 that the position that is used to carry out the variable data piece interweaves and be used for carrying out mapping 1512 (2K operator schemes) or 6048 (8K operator schemes) effectively carrier wave be the symbol interleaver 252 of pre-determined bit word.
OFDM modulator 300 comprises map unit 310, frame forming unit 320, hiding pilot plug-in unit 330, IFFT unit 340 and protects and insert unit 350 at interval.
Map unit 310 becomes symbol constellation with the OFDM data map after the error correction coding, such as QPSK, 16QAM and 64QAM.
Frame forming unit 320 is inserted into pilot signal in the predetermined subcarrier, and according to each sending mode delta frame structure.
As a result, ofdm signal comprises a plurality of subcarriers, and each subcarrier has data subcarrier, be used for that passage is estimated and the scattered pilot of synchronization acquistion and continuous pilot and TPS pilot tone or based on the system information that sends service mode.
Except first pilot tone that frame forming unit 320 inserts, hide pilot plug-in unit 330 with extremely lower powered hiding I pilot signal Hidden_Pilot P IWith hiding Q pilot signal Hidden_Pilot P QAdd I signal and Q signal or ofdm signal respectively to.Hide I pilot signal P IWith hiding Q pilot signal P QAdd to periodically in I signal and the Q signal with 1 symbol time every ofdm signal.Wherein, hide I pilot signal P IPower be provided with in the following manner, that is, the cumulative power of the hiding I pilot signal of predetermined quantity is than the average power height of I signal.Hide I pilot signal P IPower can use correlation method or other method to accumulate.Hide Q pilot signal P QPower can hide I pilot signal P with being provided with IThe identical mode of mode of power be provided with.
Hide pilot signal Hidden_Pilot P IAnd P QAdd I signal and Q signal or ofdm signal to, the form of signal as shown in Figure 5.This figure illustrates frame form signal and hiding pilot signal Hidden_PilotP IAnd P QBe positioned at N, perhaps the point of IFFT several, on each in the subcarrier.
By using these to add hiding pilot signal Hidden_Pilot P in I signal and the Q signal to IAnd P Q, receiving terminal can be carried out channel-equalization and obtain time domain and frequency domain is synchronous.Because that add is extremely lower powered hiding pilot signal Hidden_Pilot P IAnd P QSo, can with the existing system compatibility.
IFFT unit 340 is modulated to time domain OFDM signal with frequency domain ofdm signal, and can support 2K and 8K pattern.That is to say that IFFT unit 340 will be distributed to a plurality of subcarriers by the frequency domain ofdm signal that a plurality of parallel datas constitute and modulate, thus the time domain OFDM signal that output is made of a plurality of sampled datas.
Protection is inserted unit 350 at interval and is being carried out the OFDM symbol front insertion GI that is exported behind the IFFT.Specifically, the GI that duplicates the sampled data that will intercept from the afterbody of ofdm signal is inserted into the front of OFDM symbol, so that prevent the ISI under the multi-path environment.
The ofdm signal of the processing that is produced is sent on the frequency band of expectation by the RF passage by RF unit (not shown).
As mentioned above, at the form of mapping signal, in frequency domain, add and hide pilot signal Hidden_Pilot P IAnd P Q, so that with the existing system compatibility.Hide pilot signal Hidden_Pilot P IAnd P QHas 1 identical symbol time with the frame shaped signal.Hide pilot signal Hidden_Pilot P IAnd P QCan use PN (pseudo noise) sequence or any other value to constitute.Hide pilot signal Hidden_Pilot P IAnd P QFor reception and transmitting terminal is known.
The hiding pilot signal Hidden_Pilot P that the DVB-T transmitting system is sent IAnd P QBe used for carrying out channel-equalization and obtain Frequency Synchronization by receiving terminal, thereby improve receptivity.
Fig. 6 illustrates the flow chart according to the signal processing method of DVB-T transmitting system of the present invention.
FEC unit 200 is at each coded input data in non-layered sending mode, layering sending mode and the non-layered mixing sending mode, so that receiving terminal EDC error detection and correction (S10).
Map unit 330 is mapped to symbol constellation at each pattern with coded data, such as QPSK, 16QAM and 64QAM (S20).
Frame forming unit 320 is inserted in the predetermined subcarrier first pilot signal and delta frame structure (S30) at each sending mode.Add first pilot tone in the OFDM symbol to and can be and be used for scattered pilot that synchronization acquistion and passage estimate and continuous pilot and TPS or based on the system information that sends service mode.
Hide pilot plug-in unit 330 and will have hiding I pilot signal P 1 symbol time identical, extremely lower powered with I signal and Q signal IWith hiding Q pilot signal P QAdd I signal and Q signal respectively to, or ofdm signal, (S40) as shown in Figure 4.Hide pilot signal Hidden_Pilot P IAnd P QCan use PN (pseudo noise) sequence or any other value to constitute, be known for reception and transmitting terminal.
Because that add is extremely lower powered hiding pilot signal Hidden_Pilot P IAnd P QSo, can improve receptivity and with the existing system compatibility.
IFFT unit 340 is modulated to time domain OFDM signal (S50) with frequency domain ofdm signal.
Protection is inserted unit 350 at interval and is being carried out the OFDM symbol front insertion GI (S60) that is exported IFFT (invert fast fourier transformation) back.Specifically, whole OFDM symbol 1/4,1/8,1/16 or 1/32 afterbody can be used as GI.
RF unit (not shown) sends ofdm signal by the RF passage on the frequency band of expectation.
Described as an example above to add in the DVB-T transmitting system and hidden pilot signal P IAnd P QMethod, still, also it can be generalized in all systems that adopt the OFDM modulator approach.
The COFDM transmitting system is hidden pilot signal by add the low-power that has with the ofdm signal same-sign time in frequency domain according to the present invention, can improve receptivity.
Owing in this system, will add power setting very low of the hiding pilot signal in the frequency domain to, thus can with the existing system compatibility.
Although described the present invention with reference to certain preferred embodiment, it should be appreciated by those skilled in the art, under the situation of the spirit and scope of the present invention that do not break away from the claims qualification, can make the variation on various forms and the details.
The foregoing description and advantage only are used for the present invention exemplarily is described, rather than are used for limiting the present invention.Described principle can be applied to the device of other type naturally.Description of the invention attempts to illustrate rather than be used to limit the scope of claim.For a person skilled in the art, various distortion, change and correction all are conspicuous.In the appended claims, device adds the sentence formula of function to be attempted to cover the various structures of carrying out described function described here, is not limited only to structural equivalence, but comprises various equivalent constructions.

Claims (16)

1. multicarrier transmitting system comprises:
The FEC unit is used for frequency domain ofdm signal is encoded, so that the receiving terminal EDC error detection and correction;
Map unit is used to shine upon coded frequency domain ofdm signal;
The frame forming unit is used for first pilot signal is inserted into frequency-region signal, to generate at the formed OFDM frame signal of each sending mode;
Pilot plug-in unit is used for the hiding pilot signal that the average power of power ratio OFDM frame signal is low and adds the OFDM frame signal to;
The IFFT unit is used for by carrying out IFFT the frequency-domain OFDM frame signal being modulated to time domain OFDM signal; And
Protection is inserted the unit at interval, is used for inserting protection at interval in the time domain OFDM signal front.
2. multicarrier transmitting system according to claim 1, wherein, first pilot signal is discrete guide-frequency signal and the continuous pilot signal that receiving terminal is used for synchronization acquistion and channel-equalization information, and at the TPS of each sending mode as system information.
3. multicarrier transmitting system according to claim 1, wherein, the OFDM frame signal has I signal and Q signal, and hiding pilot signal has the hiding I pilot signal and the hiding Q pilot signal of adding I signal and Q signal respectively to.
4. multicarrier transmitting system according to claim 3, wherein, the power of hiding the I pilot signal is provided with in the following manner, that is and, the cumulative power of the hiding I pilot signal of predetermined quantity is than the average power height of I signal; The power of hiding the Q pilot signal is provided with in the following manner, that is, the cumulative power of the hiding Q pilot signal of predetermined quantity is than the average power height of Q signal.
5. multicarrier transmitting system according to claim 4 wherein, is hidden the cumulative power of I pilot signal and the cumulative power of hiding Q pilot signal and is adopted correlation method to produce.
6. multicarrier transmitting system according to claim 4, wherein, the hiding I pilot signal of adding I signal and Q signal to has identical with I signal and Q signal respectively symbol time with hiding Q pilot signal.
7. multicarrier transmitting system according to claim 4, wherein, hiding pilot signal is a synchronizing information.
8. according to the described multicarrier transmitting system of the arbitrary claim of claim 1 to 7, wherein, hiding pilot signal is the PN sequence.
9. the signal processing method of a multicarrier transmitting system comprises step:
Frequency-region signal is encoded, so that the receiving terminal EDC error detection and correction;
Shine upon coded frequency-region signal;
First pilot signal is inserted in the frequency-region signal, to generate at the formed OFDM frame signal of each sending mode;
The hiding pilot signal that the average power of power ratio OFDM frame signal is low is added in the OFDM frame signal;
By carrying out IFFT, the frequency-domain OFDM frame signal is modulated to time domain OFDM signal; And
Insert protection at interval in the time domain OFDM signal front.
10. signal processing method according to claim 9, wherein, first pilot signal is discrete guide-frequency signal and the continuous pilot signal that receiving terminal is used for synchronization acquistion and channel-equalization information, and at the TPS of each sending mode as system information.
11. signal processing method according to claim 9, wherein, the OFDM frame signal has I signal and Q signal, and hiding pilot signal has the hiding I pilot signal and the hiding Q pilot signal of adding I signal and Q signal respectively to.
12. signal processing method according to claim 11, wherein, the power of hiding the I pilot signal is provided with in the following manner, that is, the cumulative power of the hiding I pilot signal of predetermined quantity is than the average power height of I signal; The power of hiding the Q pilot signal is provided with in the following manner, that is, the cumulative power of the hiding Q pilot signal of predetermined quantity is than the average power height of Q signal.
13. signal processing method according to claim 12 wherein, is hidden the cumulative power of I pilot signal and the cumulative power of hiding Q pilot signal and is adopted correlation method to produce.
14. signal processing method according to claim 11, wherein, the hiding I pilot signal of adding I signal and Q signal to has identical with I signal and Q signal respectively symbol time with hiding Q pilot signal.
15. signal processing method according to claim 9, wherein, hiding pilot signal is a synchronizing information.
16. according to the described signal processing method of the arbitrary claim of claim 9 to 15, wherein, hiding pilot signal is the PN sequence.
CNB03108690XA 2002-09-30 2003-04-04 Multi-carrier transmitting system and method with frequeney-domain pilot signal and hidden pilot signal Expired - Fee Related CN1251496C (en)

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KR59368/2002 2002-09-30
KR1020020059368A KR100842069B1 (en) 2002-09-30 2002-09-30 COFDM transmission system add pilot signal in frequence domain and a method proessing OFDM signal thereof
KR59368/02 2002-09-30

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US8428160B2 (en) 2006-10-20 2013-04-23 Timi Technologies Co., Ltd. Multi-carrier digital mobile multimedia broadcast system and the digital information transmission method thereof
CN103905366B (en) * 2007-09-18 2018-01-09 Lg电子株式会社 The method of broadcast singal is handled in receivers and handles the receiver of broadcast singal
CN105075207A (en) * 2013-03-13 2015-11-18 索尼公司 Transmitters, receivers and methods of transmitting and receiving with scattered and continuous pilots in an ofdm system
US10075320B2 (en) 2013-03-13 2018-09-11 Saturn Licensing Llc Transmitters, receivers and methods of transmitting and receiving
CN105075207B (en) * 2013-03-13 2018-12-14 索尼公司 Emitted and received transmitter, receiver and method in ofdm system using discrete and CP continuous pilot
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