CN1231089A - Orthogonal frequency-division multiplex transmission system, and its transmitter and receiver - Google Patents

Orthogonal frequency-division multiplex transmission system, and its transmitter and receiver Download PDF

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Publication number
CN1231089A
CN1231089A CN98800917A CN98800917A CN1231089A CN 1231089 A CN1231089 A CN 1231089A CN 98800917 A CN98800917 A CN 98800917A CN 98800917 A CN98800917 A CN 98800917A CN 1231089 A CN1231089 A CN 1231089A
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mentioned
carrier wave
section
pilot signal
frequency
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Inventor
木村知弘
林健一郎
木曾田晃
曾我茂
影山定司
齐藤正典
石川达也
森仁
高田政幸
黑田彻
佐佐木诚
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High-Grade Digital-Tv Broadcast System Kenkyosho K K
Japan Broadcasting Corp
Panasonic Holdings Corp
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High-Grade Digital-Tv Broadcast System Kenkyosho K K
Nippon Hoso Kyokai NHK
Matsushita Electric Industrial Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/0036—Joints for corrugated pipes
    • F16L25/0045—Joints for corrugated pipes of the quick-acting type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The invention relates to an OFDM transmission method. Received OFDM signals are transformed from a time domain into a frequency domain by Fourier transformation (12) to generate a vector sequence of each carrier wave in the frequency domain. Necessary dispersion pilot signals and termination pilot signals (13) are extracted from the vector sequence and divided (15) by a modulation complex vector to estimate transmission line characteristics relative to the dispersion/termination pilot signals, and the transmission line characteristics are interpolated (16) to estimate transmission line characteristics relative to the information transmission carrier wave of a synchronous detection segment. The vector sequence obtained by Fourier transformationis is delayed (17) by one symbol. The interpolation output is selected (18) in the case of the synchronous detection segment, and the delay output is selected (18) in the case of a differential detection segment. The vector sequence is divided by the selected output, and the result is subjected to synchronous detection or differential detection (19) and demodulated (20) to generate digital information. Thus, high quality demodulation and demodulation suitable for mobile reception are realized.

Description

Orthogonal frequency-division multiplex transmission system and dispensing device thereof and receiving system
The present invention relates in a channel, mix and be suitable for fixing reception and move signal that receives and the orthogonal frequency-division multiplex transmission system that transmits.And, relate to according to this OFDM mode and form the dispensing device that ofdm signal transmits and receive the ofdm signal that forms and transmit according to this OFDM mode and carry out the demodulated received device.
Now, as the digital broadcasting mode in the surface wave TV broadcasting, studied use OFDM (hereinafter referred to as OFDM) technology.This OFDM transmission means is a kind of of multi-carrier modulation, modulates transmitting digital information in a plurality of carrier waves with the mutually orthogonal frequency relation of each code element.This mode is transmitted by above-mentioned like that digital information being divided in a plurality of carrier waves, therefore, be used to modulate the code element of divided digital information of a carrier wave during length elongated, have the character of the influence of the delay ripple that is difficult to be subjected to multipath etc.
As the existing digital broadcasting mode of using the TV signal of OFDM transmission technology, can exemplify out: the DVB-T standard in Europe, i.e. ETSI 300 744 (ETSI:EuropeanTelecommunications Standards Institute).
Existing OFDM transmission means is used the carrier wave of 1705 carrier waves in full transmission band by for example 2k pattern (number of samples of the high speed Fourier transform when the 2k representative generates ofdm signal is 2048), wherein, the carrier wave of 142 carrier waves is used for scattered pilot (Scattered Pilot) signal, the carrier wave of 45 carrier waves is used for continuous pilot (Continual Pilot) signal, the carrier wave of 17 carrier waves is used for control information (TPS), the carrier wave of 1512 carrier waves is used for transmission information signal.
But, in the continuous pilot signal of the carrier wave of 45 carrier waves, the continuous pilot signal of the carrier wave of 11 carrier waves and scattered pilot repeated configuration.And the frequency configuration in the code element of scattered pilot signal is configured to 12 carrier cycles, and for each code element, this frequency configuration moves and disposes every 3 carrier waves, and the time is configured as 4 code-element periods.
Specifically, make carrier index k from an end in order from 0 to 1704, making the symbol number n in the frame is from 0 to 67, and at this moment, the scattered pilot signal is configured in the carrier wave of the carrier index k in (1) formula.In (1) formula, mod represents the complementation computing, and p is the integer below 141 more than 0.
k=3(n?mod?4)+12p????(1)
Continuous pilot signal is configured in carrier index k={0,48,54,87,141,156,192,201,255,279,282,333,432,450,483,525,531,618,636,714,759,765,780,804,873,888,918,939,942,969,984,1050,1101,1107,1110,1137,1140,1146,1206,1269,1323,1377,1491,1683, in the carrier wave of 1704}.
These disperse and continuous pilot signal is basis and the serial w of the corresponding PN of carrier index k (pseudo random number) that disposes respectively kCome with the complex vector c shown in (2) formula K, nModulated carrier is resulting.In (2) formula, Re{c K, nRepresentative and the corresponding complex vector c of carrier wave of carrier index k, symbol number n K, nReal part, Im{c K, nRepresent imaginary part.
Figure A9880091700101
And the control information signal that is called as TPS (Transmission Parameter Signaling sends parameter signal) is configured in carrier index k={34,50,209,346,413,569,595,688,790,901,1073,1219,1262,1286,1469,1594, in the carrier wave of 1687}, each code element is transmitted the control information of 1 bit.
When making with the symbol number is the code element control information transmission bit of n when being Sn, and the control information signal is that the n modulated carrier is resulting with the complex vector ck shown in (3) formula.That is, the carrier wave of control information transmission signal carries out differential 2 value PSK (Phase Shift Keying, frequency shift keying) modulation between code element.
Figure A9880091700111
But in the stem code element (symbol number n=0) of frame, the carrier wave of control information transmission is according to the above-mentioned complex vector ck of PN series Wk shown in (4) formula, and n modulates.
Figure A9880091700112
The carrier wave that is used for 1512 carrier waves of above-mentioned carrier wave transmission information signal in addition carries out QPSK, 16QAM or 64QAM modulation according to digital information.Any modulation system all is the absolute phase modulation.
In Figure 10, represented to receive an example of the existing receiving system of such ofdm signal that generates and demodulation digital information.
In Figure 10, the ofdm signal that is received carries out frequency translation by tuner 101, carries out the T/F conversion by Fourier transform circuit 102, and becomes the vector string of each carrier wave in carrier wave zone.This vector string is provided for scattered pilot and extracts circuit 103 and continuous pilot extraction circuit 109.
Scattered pilot extracts the vector string extraction scattered pilot signal of circuit 103 from Fourier transform circuit 102 outputs.Vector generation circuit 104 takes place and extracts the corresponding modulated complex vector C of scattered pilot signal that circuit 103 is extracted by scattered pilot K, nDivision circuit 105 will extract scattered pilot signal that circuit 103 extracted divided by the complex vector that is produced by vector generation circuit 104 by scattered pilot, infer transmission path characteristic with scattered pilot signal correction from this division arithmetic result.
Interpolating circuit 106 interpolations with by the transmission path characteristic of division circuit 105 resulting scattered pilot signal corrections, and infer and whole relevant transmission path characteristic of carrier wave.Division circuit 107 with the vector string of Fourier transform circuit 102 output divided by the transmission path characteristic of being inferred, to carry out synchronous detection by the interpolating circuit 106 relevant with corresponding respectively carrier wave.The modulation system (QPSK, 16QAM, 64QAM etc.) of demodulator circuit 108 when generating transmission information signal comes the synchronous detection signal of division circuit 107 outputs is carried out demodulation, and obtains the digital information transmitted.
Continuous pilot is extracted the vector string extraction continuous pilot signal of circuit 109 from Fourier transform circuit 102 outputs.Vector generation circuit 110 takes place and extracts the corresponding modulated complex vector C of continuous pilot signal that circuit 109 is extracted by continuous pilot K, nDivision circuit 111 will extract circuit 109 continuous pilot signal that is extracted and the complex vector that takes place with vector generation circuit 110 by continuous pilot and be divided by, and infer the transmission path characteristic relevant with continuous pilot signal.112 pairs of transmission path characteristic relevant with the continuous pilot signal of being inferred by division circuit 111 of inverse fourier transform circuit are carried out frequency-time change, and obtain the pusle response characteristics of transmission path.
But, the prerequisite of existing OFDM transmission means is to use the transmission path characteristic that obtains like this: the modulation of the carrier wave of transmitting digital information is carried out the absolute phase modulation undertaken by QPSK, 16QAM, 64QAM etc., to this demodulation, the transmission path characteristic that level and smooth interpolation is inferred from last sparse scattered pilot signal of time, therefore, exist because of decline and wait the situation that can not obtain enough transmission qualities in the variation of transmission path characteristic rapidly in the mobile communication.
And, in existing OFDM transmission means, the modulation system of each carrier wave is defined as one in all frequency bands, therefore, in order to be suitable for moving for example differential QPSK modulation that receives and in the modulation of the carrier wave of transmitting digital information, import, even like this while moving the digital information that receive a part, all transmission capacities tail off, then deterioration of efficiency.
And, because continuous pilot signal is configured in in the carrier wave of predetermined carrier spacing A any, the turning back of A/one of length (inverse of the minimum frequency space of carrier wave) during the effective code element then taken place the pusle response characteristics of the transmission path that can infer from continuous pilot signal.
Therefore, in order to solve above-mentioned problem, the purpose of this invention is to provide a kind of OFDM mode and the dispensing device, the receiving system that are suitable for this mode, this OFDM mode can not only be kept all transmission capacities but also partly import in the modulation of the carrier wave of transmitting digital information and be suitable for moving the modulation system that receives, and, configuration continuous pilot signal and can in the impulse response of the transmission path of inferring, not turning back by continuous pilot signal.
In order to address the above problem, OFDM transmission means involved in the present invention constitutes like this:
(1) a kind of OFDM transmission means modulates transmitting digital information to a plurality of carrier waves that have mutually orthogonal frequency relation in each code-element period, it is characterized in that:
In above-mentioned a plurality of carrier waves, the carrier wave of predetermined quantity is distributed to more than one section as a unit, give the band terminal pilot signal more than one allocation of carriers, use above-mentioned more than one section in each section, to use or differential detection usefulness respectively as synchronous detection
Use in the section at above-mentioned synchronous detection, give the scattered pilot signal of the allocation of carriers of symbol time and frequency period dispersion with particular phases and this carrier wave of Modulation and Amplitude Modulation, the allocation of carriers of giving the frequency identical with each code element according to additional information by M, (M is the natural number more than 2) phase phase shift keying, (M phase PSK) or the differential M phase phase shift keying on the code element direction are modulated the additional information transmission signals of this carrier wave, modulate the transmission information signal of this carrier wave for according to above-mentioned digital information above-mentioned carrier wave allocation of carriers in addition
Use in the section in above-mentioned differential detection; Modulated the additional information signal transmission of this carrier wave by M phase phase-shift keying (PSK) or the differential M phase phase-shift keying (PSK) on the code element direction according to additional information to the allocation of carriers of the frequency identical with each code element; Give and to satisfy adjacent synchronous detection with the allocation of carriers of the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal of the section terminal pilot signal with specific phase place and this carrier wave of Modulation and Amplitude Modulation; Modulate the transmission information signal of this carrier wave for according to above-mentioned digital information above-mentioned carrier wave allocation of carriers in addition
Come to modulate this carrier wave with specific phase place and amplitude with the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal in the section with satisfying above-mentioned synchronous detection to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end.
(2) a kind of OFDM transmission means modulates transmitting digital information to a plurality of carrier waves that have mutually orthogonal frequency relation in each code-element period, it is characterized in that:
In above-mentioned a plurality of carrier waves, the carrier wave of predetermined quantity is distributed to more than one section as a unit, give the band terminal pilot signal more than one allocation of carriers, use above-mentioned more than one section in each section, to use or differential detection usefulness respectively as synchronous detection
Use in the section at above-mentioned synchronous detection, give the scattered pilot signal of the allocation of carriers of symbol time and frequency period dispersion with particular phases and this carrier wave of Modulation and Amplitude Modulation, give the continuous pilot signal of the allocation of carriers of the frequency identical with particular phases and this carrier wave of Modulation and Amplitude Modulation with each code element, modulate the additional information transmission signals of this carrier wave by M phase phase shift keying or the differential M phase phase shift keying on the code element direction according to additional information to the allocation of carriers of the frequency identical with each code element, modulate the transmission information signal of this carrier wave for according to above-mentioned digital information above-mentioned carrier wave allocation of carriers in addition
Use in the section in above-mentioned differential detection, give the continuous pilot signal of the allocation of carriers of the frequency identical with particular phases and this carrier wave of Modulation and Amplitude Modulation with each code element, modulate the additional information transmission signals of this carrier wave by M phase phase shift keying or the differential M phase phase shift keying on the code element direction according to additional information to the allocation of carriers of the frequency identical with each code element, give and to satisfy adjacent synchronous detection with the allocation of carriers of the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal of section terminal pilot signal with specific phase place and this carrier wave of Modulation and Amplitude Modulation, modulate the transmission information signal of this carrier wave for according to above-mentioned digital information above-mentioned carrier wave allocation of carriers in addition
Come to modulate this carrier wave with specific phase place and amplitude with the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal in the section with satisfying above-mentioned synchronous detection to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end.
(3) in the formation of (1) or (2), above-mentioned synchronous detection is the common configuration of part with the frequency configuration of the said additional information transmission signals in the section and above-mentioned differential detection with the frequency configuration of the interior said additional information transmission signals of section.
(4) in the formation of (1) or (2), in above-mentioned synchronous detection usefulness section, the part of the frequency configuration of said additional information transmission signals as the frequency configuration of the said additional information transmission signals of above-mentioned differential detection usefulness section.
(5) in the formation of (2), above-mentioned synchronous detection is the common configuration of part with the frequency configuration of the above-mentioned continuous pilot signal in the section and above-mentioned differential detection with the frequency configuration of the interior above-mentioned continuous pilot signal of section.
(6) in the formation of (2), in above-mentioned synchronous detection usefulness section, the part of the frequency configuration of above-mentioned continuous pilot signal as the frequency configuration of the above-mentioned continuous pilot signal of above-mentioned differential detection usefulness section.
(7) in any formation of (1)～(6), in said additional information, comprise control information.
(8) in the formation of (7), above-mentioned control information is transmitted by the differential two-phase phase shift keying (DBPSK) on the code element direction.
(9) in the formation of (7), above-mentioned synchronous detection is the common configuration of part with the frequency configuration of the above-mentioned control information in the section and above-mentioned differential detection with the frequency configuration of the interior above-mentioned control information of section.
(10) in the formation of (7), in above-mentioned synchronous detection usefulness section, the part of the frequency configuration of above-mentioned control information as the frequency configuration of the above-mentioned control information of above-mentioned differential detection usefulness section.
(11) in any formation of (1)～(10), use in the section at above-mentioned synchronous detection, making number of carriers is N (N is the natural number more than 2), above-mentioned scattered pilot signal allocation is given the N carrier spacing and in each code element displacement the carrier wave of L (L is the approximate number of N) carrier wave.
(12) in any formation of (1)～(11), above-mentioned synchronous detection with and differential detection with in the section, the inverse fourier transform of frequency configuration of each said additional information transmission signals being distributed to this additional information transmission signals is to the carrier wave of the frequency that becomes the shape of pulsing.
(13) in the formation of (2), above-mentioned synchronous detection with and differential detection with in the section, the inverse fourier transform of frequency configuration of each above-mentioned continuous pilot signal being distributed to this continuous pilot signal is to the carrier wave of the frequency that becomes the shape of pulsing.
(14) in the formation of (2), use in the section in above-mentioned synchronous detection usefulness and differential detection, the inverse fourier transform of each said additional information transmission signals and continuous pilot signal being distributed to the frequency configuration that this additional information transmission signals and continuous pilot signal are combined is right, becomes the carrier wave of the frequency of pulsation shape.
(15) in any formation of (1)～(14), above-mentioned synchronous detection with and differential detection with in the section, the carrier wave of use same number.
(16) in any formation of (1)～(15), above-mentioned terminal pilot signal only is configured in the carrier wave of above-mentioned differential detection with the frequency band end of section.
(17) in the formation of (1), by 13 sections with use the band terminal pilot tone of the carrier wave of a carrier wave to form, section is made of the carrier wave of 108 carrier waves, the carrier wave of 1405 carrier waves of use in whole frequency band,
Above-mentioned synchronous detection with section by the scattered pilot signal of the carrier wave that uses 9 carrier waves in each code element, use 3 carrier waves carrier wave the additional information transmission signals and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted,
Above-mentioned differential detection with section by the additional information signal of the carrier wave that uses 11 carrier waves, use a carrier wave carrier wave the terminal pilot signal and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted.
(18) in the formation of (2), by 13 sections with use the band terminal pilot tone of the carrier wave of a carrier wave to form, section is made of the carrier wave of 108 carrier waves, the carrier wave of 1405 carrier waves of use in whole frequency band,
Above-mentioned synchronous detection with section by the scattered pilot signal of the carrier wave that uses 9 carrier waves in each code element, use the carrier wave of 1 carrier wave the additional information transmission signals, use 2 carrier waves carrier wave continuous pilot signal and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted
Above-mentioned differential detection with section by the additional information signal of the carrier wave that uses 5 carrier waves, use the carrier wave of 6 carrier waves continuous pilot signal, use a carrier wave carrier wave the terminal pilot signal and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted.
(19) generate the device of ofdm signal by each described orthogonal frequency-division multiplex transmission system of (1)～(18).
(20) generate the dispensing device of ofdm signal by the orthogonal frequency-division multiplex transmission system of (1), comprising:
Inking device in above-mentioned a plurality of carrier waves, is distributed to more than one section to the carrier wave of predetermined quantity as a unit, and above-mentioned more than one section is distributed to synchronous detection usefulness or differential detection usefulness respectively in each section;
Signal generating apparatus generates above-mentioned scattered pilot signal, said additional information transmission signals, above-mentioned transmission information signal, above-mentioned terminal pilot signal, above-mentioned band terminal pilot signal respectively,
In above-mentioned inking device, come to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end with the periodic frequency of the frequency configuration of above-mentioned scattered pilot signal in the section with satisfying above-mentioned synchronous detection, for above-mentioned synchronous detection section, the above-mentioned scattered pilot signal of allocation of carriers of disperseing for symbol time and frequency period ground, give the allocation of carriers said additional information transmission signals of the frequency identical, give the above-mentioned carrier wave above-mentioned transmission information signal of allocation of carriers in addition with each code element; For above-mentioned differential detection section, give the allocation of carriers said additional information transmission signals of the frequency identical, satisfy the periodic allocation of carriers above-mentioned terminal pilot signal of adjacent synchronous detection with the frequency configuration of the above-mentioned scattered pilot signal of section to frequency with each code element.
(21) generate the dispensing device of ofdm signal by the orthogonal frequency-division multiplex transmission system of (2), comprising:
Inking device, in above-mentioned a plurality of carrier waves, the carrier wave of predetermined quantity is distributed to more than one section as a unit, give the band terminal pilot signal more than one allocation of carriers, above-mentioned more than one section is distributed to synchronous detection usefulness or differential detection usefulness respectively in each section;
Signal generating apparatus generates above-mentioned scattered pilot signal, said additional information transmission signals, above-mentioned transmission information signal, above-mentioned terminal pilot signal, above-mentioned band terminal pilot signal, above-mentioned continuous pilot signal respectively,
In above-mentioned inking device, come to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end with the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal in the section with satisfying above-mentioned synchronous detection, for above-mentioned synchronous detection section, the above-mentioned scattered pilot signal of allocation of carriers of disperseing for symbol time and frequency period ground, give the above-mentioned continuous pilot signal of allocation of carriers of the frequency identical with each code element, give the allocation of carriers said additional information transmission signals of the frequency identical, give the above-mentioned carrier wave above-mentioned transmission information signal of allocation of carriers in addition with each code element; For above-mentioned differential detection section, give the above-mentioned continuous pilot signal of allocation of carriers of the frequency identical with each code element, give the allocation of carriers said additional information transmission signals of the frequency identical, satisfy the periodic allocation of carriers above-mentioned terminal pilot signal of adjacent synchronous detection with the above-mentioned scattered pilot signal frequency configuration of section to frequency with each code element.
And receiving system involved in the present invention constitutes like this:
(22) have and receive ofdm signal that is generated by each described OFDM transmission means of (1)～(18) and the device that carries out demodulation.
(23) receive the ofdm signal that is generated by each described OFDM transmission means of (1)～(18) and carry out the demodulated received device, comprising:
Fourier transform device is transformed to the signal of frequency domain to above-mentioned reception ofdm signal by Fourier transform from time-domain, thus, obtains representing the phase place of above-mentioned each carrier wave and the vector string of amplitude;
First extraction element is from the set of vectors by the resultant vector string extraction of this Fourier transform device and above-mentioned scattered pilot signal and above-mentioned terminal pilot signal and the corresponding carrier wave of above-mentioned band terminal pilot signal;
First devision device will be divided by by this first extraction element set of vectors of being extracted and above-mentioned particular phases and the amplitude of modulating above-mentioned scattered pilot signal and above-mentioned terminal pilot signal and above-mentioned band terminal pilot signal;
Filter apparatus, the output of level and smooth and this first devision device of interpolation on frequency direction and symbol time direction;
Deferred mount is during being postponed a code element by the resulting vector string of above-mentioned Fourier transform device;
Choice device is selected the output of above-mentioned filter apparatus when handling above-mentioned synchronous detection with the signal of section, select the output of above-mentioned deferred mount during with the signal of section in the above-mentioned differential detection of processing;
Second devision device, the vector string that will export from above-mentioned Fourier transform device and the output signal of above-mentioned choice device are divided by, and obtain detection vector string and output.
(24) receive the ofdm signal that the OFDM transmission means by (13) generated and carry out the demodulated received device, comprising:
Fourier transform device is transformed to the signal of frequency domain to above-mentioned reception ofdm signal by Fourier transform from time-domain, thus, obtains representing the phase place of above-mentioned each carrier wave and the vector string of amplitude;
Second extraction element is from being extracted the set of vectors of using the corresponding carrier wave of above-mentioned continuous pilot signal of section with above-mentioned synchronous detection with section and above-mentioned differential detection by the resultant vector string of this Fourier transform device;
The 3rd devision device will be divided by by this second extraction element set of vectors of being extracted and above-mentioned particular phases and the amplitude of modulating above-mentioned continuous pilot signal;
The inverse fourier transform device is the output of the 3rd devision device time-domain by inverse fourier transform from frequency domain transformation, thus, obtains the pusle response characteristics of transmission path.
These and other purpose, advantage and feature of the present invention will be in conjunction with the drawings to the description of embodiments of the invention and further specified.In these accompanying drawings:
Fig. 1 is in first and second embodiment of OFDM transmission means involved in the present invention, represents synchronous detection usefulness or the differential detection figure with the configuration example of section (adding up to 13 sections), band terminal pilot signal;
Fig. 2 represents the configuration of additional information transmission signals, the configuration that synchronous detection is used the scattered pilot signal in the section, the figure that differential detection is used the configuration example of the terminal pilot signal in the section in first and second embodiment of OFDM transmission means involved in the present invention;
Fig. 3 represents the configuration of continuous pilot signal and control information signal, the configuration that synchronous detection is used the scattered pilot signal in the section, the figure that differential detection is used the configuration example of the terminal pilot signal in the section in second embodiment of OFDM transmission means involved in the present invention;
Fig. 4 in second embodiment of OFDM transmission means involved in the present invention, the synchronous detection of expression shown in the table 2 with the inverse fourier transform of the frequency configuration of the continuous pilot signal of section right time-amplitude response figure;
Fig. 5 in second embodiment of OFDM transmission means involved in the present invention, the differential detection of expression shown in the table 2 with the inverse fourier transform of the frequency configuration of the continuous pilot signal of section right time-amplitude response figure;
Fig. 6 in second embodiment of OFDM transmission means involved in the present invention, the synchronous detection of expression shown in the table 3 with the inverse fourier transform of the frequency configuration of the control information signal of section right time-amplitude response figure;
Fig. 7 in second embodiment of OFDM transmission means involved in the present invention, the differential detection of expression shown in the table 3 with the inverse fourier transform of the frequency configuration of the control information signal of section right time-amplitude response figure;
Fig. 8 is illustrated in the frame circuit diagram of the formation of employed dispensing device in the OFDM transmission means involved in the present invention as the 5th embodiment;
Fig. 9 is illustrated in the frame circuit diagram of the formation of employed receiving system in the OFDM transmission means involved in the present invention as the 6th embodiment;
Figure 10 is illustrated in the frame circuit diagram of the formation of employed receiving system in the existing OFDM transmission means.
Below to OFDM transmission means involved in the present invention and be suitable for the dispensing device of this OFDM transmission means, the embodiment of receiving system is elaborated.First embodiment
In the OFDM of present embodiment transmission means, by 13 sections with use the band terminal pilot tone of the carrier wave of a carrier wave to form, section is made of the carrier wave of 108 carrier waves.Each section is made of with one of section with section or differential detection synchronous detection.In all frequency bands, use the carrier wave of 1405 carrier waves.
In Fig. 1, express synchronous detection usefulness or differential detection configuration example with section (adding up to 13 sections), band terminal pilot signal.Transverse axis is represented frequency axis (carrier wave configuration), longitudinal axis express time axle (code element direction).As 0 to 107 integer, section is made of the carrier wave of 108 carrier waves the carrier index k ' in each section.
Synchronous detection uses the transmission information signal of the carrier wave of the scattered pilot signal of the carrier wave of 9 carrier waves, the additional information transmission signals that uses the carrier wave of 3 carrier waves, 96 carrier waves of use to be constituted with section by each code element.
Differential detection is constituted with the transmission information signal of section by the carrier wave of the additional information transmission signals of the carrier wave that uses 11 carrier waves, the terminal pilot signal of using the carrier wave of 1 carrier wave, 96 carrier waves of use.
Like this, owing to use section and differential detection with the carrier wave that uses 108 same number in the section, then can not change needed transmission band by the combination of section at synchronous detection.
Wherein, making carrier index k in all frequency bands is 0 to 1404 integer, and making sector number i is 0 to 12 integer, and making carrier index k ' in each section is 0 to 107 integer, then satisfies k=i108+k '.
Being arranged on synchronous detection is configured in each section and the carrier wave by the carrier index k ' in (5) section that formula produced with the scattered pilot signal in the section.In (5) formula, mod represents the complementation computing, and the n of expression symbol number is the integer more than 0, and p is the integer below 8 more than 0.
k′=3(n?mod?4)+12p????(5)
Being located at synchronous detection is configured in respectively in the carrier wave of the carrier index k ' in each section shown in the table 1 with the additional information transmission signals in the section with section and differential detection.Table 1 expression synchronous detection is included in differential detection with in the additional information transmission signals of section with the additional information transmission signals of section.
By above formation, even mix under the state that exists with section with section and differential detection at synchronous detection, must configuration additional information transmission signals in the carrier wave that is defined with the additional information transmission signals of section as synchronous detection, then carry out the identification of additional information transmission signals or transmission signals in addition easily at receiver side.And the additional information of passing through to be transmitted is come distributing carrier wave so that can not become the part set configuration.
The frequency configuration of table 1 additional information transmission signals
Sector number i Carrier index k '
Synchronous detection is used Differential detection is used
?No.0 ????10????28 ????50 ????3????10????28????45????59????77 ????13???50????70????83????87
?No.1 ????53????83 ????25 ????3????15????40????53????58????83 ????25???63????73????80????93
?No.2 ????61????100 ????71 ????29???41????61????84????93????100 ????4????7?????17????51????71
?No.3 ????11????101 ????55 ????11???28????45????81????91????101 ????36???48????55????59????86
?No.4 ????20????40 ????44 ????20???23????40????63????85????105 ????10???28????44????47????54
?No.5 ????74????100 ????25 ????30???74????81????92????100???103 ????7????25????47????60????87
?No.6 ????35????79 ????49 ????3????35????72????79????85????89 ????49???61????96????99????104
?No.7 ????76????97 ????65 ????5????18????57????76????92????97 ????31???39????47????65????72
?No.8 ????4?????89 ????74 ????4????13????89????93????98????102 ????16???30????37????74????83
?No.9 ????40????89 ????5 ????40???72????89????95????100???105 ????5????10????21????44????61
?No.10 ????8?????64 ????85 ????8????36????48????52????64????74 ????78???82????85????98????102
?No.11 ????7?????89 ????70 ????7????25????30????42????89????104 ????34???48????54????70????101
?No.12 ????98????101 ????37 ????10???30????55????81????98????101 ????23???37????51????68????105
Being located at differential detection, to be configured in carrier index k ' in each section with the terminal pilot signal in the section be in 0 the carrier wave.The configuration of terminal pilot signal is the periodic position of the adjacent synchronous detection of maintenance with the frequency configuration of the scattered pilot signal of section.Each terminal pilot signal is replenished this scattered pilot signal.
In Fig. 2, represented the synchronous detection configuration of the scattered pilot signal in the section, the differential detection configuration example of the terminal pilot signal in the section.Transverse axis is represented frequency axis (carrier wave configuration), longitudinal axis express time axle (code element direction).As 0 to 107 integer, section is made of the carrier wave of 108 carrier waves the carrier index k ' in each section.The additional information transmission signals is assigned to the carrier wave different with the scattered pilot signal.
These scattered pilot signals and terminal pilot signal be basis and the carrier index k that is disposed (by the decision of the carrier index k ' in sector number i and each section) the serial w of corresponding PN (pseudo random number) respectively k(w k=0,1) passes through the complex vector c shown in (6) formula K, nCome modulated carrier and obtain.In (6) formula, Re{c K, nRepresentative and the corresponding complex vector c of carrier wave of carrier index k, symbol number n K, nReal part, Im{c K, nRepresent imaginary part.
Being located at synchronous detection is used to transmit and the different additional information of carrier wave institute information transmitted transmission signals of using 96 carrier waves with the additional information transmission signals in the section with differential detection with section.For example, consider the control information of regulation transmission means (each sector number, carrier modulation mode etc.) and the information of utilizing as TV station (control information of for example in relay station, using, TV station's identification with signal etc.).Can in each code element, transmit the additional information of 1 bit, also can transmit the additional information of a plurality of bits.Can only transmit the control information of regulation transmission means.
Wherein, when making the control information bit that is transmitted by the code element of symbol number n be Sn, the control information signal is by the complex vector c shown in (7) formula K, nCome modulated carrier and obtain.That is, in the case, the carrier wave of control information transmission signal carries out differential 2 value PSK (PhaseShift Keying) modulation between code element.
But in the beginning code element (symbol number n=0) of frame, the carrier wave of control information transmission is according to above-mentioned PN series w k, by the complex vector shown in (8) formula Ck, nModulate.
Figure A9880091700242
And, in each code element, under the situation of the control information of transmission 2 bits, can for example use the differential 4 phase PSK modulation between code element, perhaps a plurality of carrier waves of control information transmission are divided into 2 groups, be distributed into and in each code element, transmit 1 bit respectively.
Be located at synchronous detection and be assigned to above-mentioned synchronous detection with the scattered pilot signal of section, the carrier wave beyond the additional information transmission signals, carry out the absolute phase modulation according to digital information with the transmission information signal in the section.In this absolute phase modulation, use for example QPSK, 16QAM, 64QAM modulation etc.
Synchronous detection carries out demodulation with the transmission information signal of section by following processing.At first, complex vector with modulation this scattered pilot signal, terminal pilot signal and band terminal pilot signal is carried out demodulation to scattered pilot signal and necessary terminal pilot signal, band terminal pilot signal, obtains the transmission path characteristic in the frequency domain relevant with scattered pilot signal and terminal pilot signal etc.And, come that with filter frequency direction and code element direction are carried out interpolation and infer the transmission path characteristic relevant with transmission information signal.Be divided by with transmission path characteristic that obtains like this and transmission information signal.Thus can be from synchronous detection section demodulating information transmission signals.
Be located at differential detection and be assigned to above-mentioned differential detection with the terminal pilot signal of section and the carrier wave outside the additional information transmission signals, come between the adjacent code element of same carrier wave numbering, to carry out differential modulation according to digital information with the transmission information signal in the section.
In this differential modulation, use for example DBPSK, DQPSK, DAPSK etc.Can be divided by with the transmission information signal of section with the transmission information signal of the same carrier wave of above-mentioned code element numbering and differential detection and carry out demodulation.
As described above, the OFDM transmission means of present embodiment, in its receiving system, can carry out high-quality reception by the effect of filter in section at synchronous detection, separate the variation of transferring be suitable for transmission path characteristic by differential between code element in differential detection in section and move the reception that receives rapidly.And, in each section, with section and differential detection section, just can realize the flexible services state that does not change with transmission band by the combination in any synchronous detection.Second embodiment
In the OFDM of present embodiment transmission means, by 13 sections with use the band terminal pilot tone of the carrier wave of a carrier wave to form, section is made of the carrier wave of 108 carrier waves.Each section is made of with one of section with section or differential detection synchronous detection.In all frequency bands, use the carrier wave of 1405 carrier waves.
Synchronous detection uses the transmission information signal of the carrier wave of the scattered pilot signal of the carrier wave of 9 carrier waves, the continuous pilot signal that uses the carrier wave of 2 carrier waves, the additional information transmission signals (in this embodiment, being called the control information signal) that uses the carrier wave of 1 carrier wave, 96 carrier waves of use to be constituted with section by each code element.
Differential detection is constituted with the transmission information signal of section by the carrier wave of the continuous pilot signal of the carrier wave that uses 6 carrier waves, the control information signal that uses the carrier wave of 5 carrier waves, the terminal pilot signal of using the carrier wave of 1 carrier wave, 96 carrier waves of use.
Wherein, making carrier index k in all frequency bands is 0 to 1404 integer, and making sector number i is 0 to 12 integer, and making carrier index k ' in each section is 0 to 107 integer, then satisfies k=i108+k '.
Being arranged on synchronous detection is configured in each section and the carrier wave by the carrier index k ' in (5) section that formula produced with the scattered pilot signal in the section.In (5) formula, mod represents the complementation computing, and the n of expression symbol number is the integer more than 0, and p is the integer below 8 more than 0.
k′=3(n?mod?4)+12p????(5)
Being located at synchronous detection is configured in respectively in the carrier wave of the carrier index k ' in each section shown in the table 2 with the continuous pilot signal in the section with section and differential detection.Table 2 expression synchronous detection is included in differential detection with in the continuous pilot signal of section with the continuous pilot signal of section.
The frequency configuration of table 2 continuous pilot signal
Sector number i Carrier index k '
Synchronous detection is used Differential detection is used
?No.0 ????10???28 ????3????10????28????45????59????77
?No.1 ????53???83 ????3????15????40????53????58????83
?No.2 ????61???100 ????29???41????61????84????93????100
?No.3 ????11???101 ????11???28????45????81????91????101
?No.4 ????20???40 ????20???23????40????63????85????105
?No.5 ????74???100 ????30???74????81????92????100???103
?No.6 ????35???79 ????3????35????72????79????85????89
?No.7 ????76???97 ????5????18????57????76????92????97
?No.8 ????4????89 ????4????13????89????93????98????102
?No.9 ????40???89 ????40???72????89????95????100???105
?No.10 ????8????64 ????8????36????48????52????64????74
?No.11 ????7????89 ????7????25????30????42????89????104
?No.12 ????98???101 ????10???30????55????81????98????101
By above formation, even mix under the state that exists with section with section and differential detection at synchronous detection, in the carrier wave of the continuous pilot that is defined as synchronous detection usefulness section, must dispose continuous pilot signal, then carry out the identification of continuous pilot signal or transmission signals in addition easily at receiver side.And, can distributing carrier wave so that can not become the part set configuration.
In the carrier wave of the frequency identical,,, then can utilize as the carrier wave that becomes benchmark at receiver side because frequency, phase place, amplitude are designated with the continuous pilot signal of particular phases and this carrier wave of Modulation and Amplitude Modulation with each code element.
Being located at differential detection, to be configured in carrier index k ' in each section with the terminal pilot signal in the section be in 0 the carrier wave.The configuration of terminal pilot signal is to keep the periodic position of adjacent synchronous detection with the frequency configuration of section scattered pilot signal.Each terminal pilot signal is replenished this scattered pilot signal.
The configuration of continuous pilot signal and control information signal, the configuration that synchronous detection is used the scattered pilot signal in the section, the configuration example that differential detection is used the terminal pilot signal in the section in Fig. 3, have been represented.Transverse axis is represented frequency axis (carrier wave configuration), longitudinal axis express time axle (code element direction).As 0 to 107 integer, section is made of the carrier wave of 108 carrier waves the carrier index k ' in each section.Continuous pilot signal, control information signal are assigned to the carrier wave different with the scattered pilot signal.
These scattered pilot signals, continuous pilot signal and terminal pilot signal be basis and the carrier index k that is disposed (by the decision of the carrier index k ' in sector number i and each section) the serial w of corresponding PN (pseudo random number) respectively k(w k=0,1) passes through the complex vector c shown in (6) formula K, nCome modulated carrier and obtain.In (6) formula, Re{c K, nRepresentative and the corresponding complex vector c of carrier wave of carrier index k, symbol number n K, nReal part, Im{c K, nRepresent imaginary part.
Be located at synchronous detection and be configured in respectively with the control information signal in the section in the carrier wave of the carrier index k ' in each section shown in the table 3, the control information of transmission 1 bit in each code element with section and differential detection.
The frequency configuration of table 3 control information signal
Sector number i Carrier index k '
Synchronous detection is used Differential detection is used
?No.0 ????50 ????13????50????70????83????87
?No.1 ????25 ????25????63????73????80????93
?No.2 ????71 ????4?????7?????17????51????71
?No.3 ????55 ????36????48????55????59????86
?No.4 ????44 ????10????28????44????47????54
?No.5 ????25 ????7?????25????47????60????87
?No.6 ????49 ????49????61????96????99????104
?No.7 ????65 ????31????39????47????65????72
?No.8 ????74 ????16????30????37????74????83
?No.9 ????5 ????5?????10????21????44????61
?No.10 ????85 ????78????82????85????98????102
?No.11 ????70 ????34????48????54????70????101
?No.12 ????37 ????23????37????51????68????105
When making the control information bit that is transmitted by the code element of symbol number n be Sn, the control information signal is by the complex vector c shown in (7) formula K, nCome modulated carrier and obtain.That is, the carrier wave of control information transmission signal carries out differential 2 value PSK (Phase Shift Keying, phase shift keying) modulation between code element.
Figure A9880091700291
But in the beginning code element (symbol number n=0) of frame, the carrier wave of control information transmission is according to above-mentioned PN series w k, by the complex vector c shown in (8) formula K, nModulate.
And, in each code element, under the situation of the control information of transmission 2 bits, can use for example differential 4 phase PSK modulation between code element.
Be located at synchronous detection and be assigned to above-mentioned synchronous detection with the carrier wave beyond scattered pilot signal, continuous pilot signal and the control information signal of section, carry out the absolute phase modulation according to digital information with the transmission information signal in the section.In this absolute phase modulation, use for example QPSK, 16QAM, 64QAM modulation etc.
Synchronous detection carries out demodulation with the transmission information signal of section by following processing.At first, complex vector with modulation this scattered pilot signal, terminal pilot signal and band terminal pilot signal is carried out contrary modulation to scattered pilot signal and necessary terminal pilot signal, band terminal pilot signal, infers the transmission path characteristic in the frequency domain relevant with scattered pilot signal and terminal pilot signal etc.And, come that with filter frequency direction and code element direction are carried out interpolation and infer the transmission path characteristic relevant with transmission information signal.Be divided by with transmission path characteristic that obtains like this and transmission information signal.Thus can be from synchronous detection section demodulating information transmission signals.
Be located at differential detection and be assigned to above-mentioned differential detection with the carrier wave outside continuous pilot signal, terminal pilot signal and the control information signal of section, come between the adjacent code element of same carrier wave numbering, to carry out differential modulation according to digital information with the transmission information signal in the section.
In this differential modulation, use for example DBPSK, DQPSK, DAPSK etc.Can carry out demodulation divided by differential detection with the transmission information signal of section with the transmission information signal of the same carrier wave of above-mentioned code element numbering.
As described above, the OFDM transmission means of present embodiment, in its receiving system, can carry out high-quality reception by the effect of filter in section at synchronous detection, separate the variation of transferring be suitable for transmission path characteristic by differential between code element in differential detection in section and move rapidly and receive.And, in each section, with section and differential detection section, just can realize the flexible services state that does not change with transmission band by the combination in any synchronous detection.
Just can determine frequency, phase place and amplitude by configuration in the carrier wave of the frequency identical with the continuous pilot signal of specific phase place and this carrier wave of Modulation and Amplitude Modulation used as reference carrier with each code element.
Fig. 4 and Fig. 5 represent that respectively the synchronous detection shown in the table 2 is right with the inverse fourier transform of the frequency configuration of the continuous pilot signal of section (13 sections, 78 carrier waves) with section (13 sections, 26 carrier waves) and differential detection.From Fig. 4, Fig. 5 as can be seen: they are pulse types, and the frequency configuration of the continuous pilot signal shown in the table 2 is not periodically.
Like this, the OFDM transmission means of present embodiment can prevent the situation that the delay ripple because of multipath etc. all slackens continuous pilot signal.By using this configuration to obtain inverse fourier transform, just can obtain the impulse response of transmission path.And the frequency configuration of continuous pilot signal is the strong configuration of autocorrelation.
Fig. 6 and Fig. 7 represent that respectively the synchronous detection shown in the table 3 is right with the inverse fourier transform of the frequency configuration of the control information signal of section with section and differential detection.From Fig. 6, Fig. 7 as can be seen: they are pulse types, and the frequency configuration of the control information signal shown in the table 3 is not periodically.
Like this, the OFDM transmission means of present embodiment can prevent the situation that the delay ripple because of multipath etc. all slackens the control information signal.
And, can set the frequency configuration of the additional information transmission signals that comprises the control information signal equally.The 3rd embodiment
Represented that in Fig. 8 OFDM transmission means according to first and second embodiment generates the formation of embodiment of the dispensing device of ofdm signal.
In Fig. 8, come as required the digital information of being imported to be carried out wrong control and treatment (error correction coding and intersection, energy dissipation etc.) and digital modulation with transmission information signal generative circuit 51.And general employed basic wrong control and treatment mode and digital modulation mode are technique known in Digital Transmission, thereby omit its explanation.
Carry out the absolute phase modulation at synchronous detection as digital modulation in section.In this absolute phase modulation, use for example QPSK, 16QAM, 64QAM modulation etc.Carry out differential modulation between according to the adjacent code element of digital information in differential detection in section in same carrier wave numbering.In this differential modulation, use for example DBPSK, DQPSK, DAPSK etc.
Additional information signal generative circuit 52 carries out wrong control and treatment (error correction coding and intersection, energy dissipation etc.) and digital modulation to the additional information of being imported as required.As digital modulation use M (M is the natural number 2 or more) phase PSK (Phase Shift Keying) modulation and differential M on the code element direction mutually PSK modulate etc.
Control information generative circuit 56 is created on the needed transmission means information of receiver side (the various information of transmission meanss such as regulation synchronous detection sector number, differential detection sector number, carrier modulation mode).This information is carried out wrong control and treatment and digital modulation by additional information signal generative circuit 52, also can carry out wrong control and treatment and the digital modulation different with other additional information.
Scattered pilot signal generating circuit 53 generates according to the scattered pilot signal of being modulated with carrier index k (by the decision of the carrier index k ' in sector number i and each section) the serial wk of corresponding PN (pseudo random number) (wk=0,1) by carrier wave configuration circuit 57 specified configuration.
Terminal pilot signal generative circuit 54 generate according to carrier index k (by the decision of the carrier index k ' in sector number i and each section) the serial w of corresponding PN (pseudo random number) by carrier wave configuration circuit 57 specified configuration k(w k=0,1) the terminal pilot signal of being modulated.
Band terminal pilot signal generative circuit 55 generates basis and the serial w of the corresponding PN of the carrier index k of band terminal (pseudo random number) k(w k=0,1) the band terminal pilot signal of being modulated.
Though continuous pilot signal is not illustrated especially,, it is contemplated that the situation of modulating with the identical phase place of each code element, amplitude by 52 pairs of these carrier waves of additional information signal generative circuit.
In carrier wave configuration circuit 57, each output (complex vector string) of transmission information signal generative circuit 51, additional information signal generative circuit 52, scattered pilot signal generating circuit 53, terminal pilot signal generative circuit 54, band terminal pilot signal generative circuit 55 is configured on the carrier position according to the frequency range of transmission means defined.
For example, the output of scattered pilot signal generating circuit 53 is configured in section with N (N is the natural number 2 or more) carrier spacing and has moved in each code element in the carrier wave of individual (L is the approximate number of the N) carrier wave of L at synchronous detection.The output of terminal pilot signal generative circuit 54 is configured in the carrier wave of carrier index k '=0 in the section in section in differential detection.And the output of additional information signal generative circuit 52 distributes according to example frequency configuration as shown in table 1.The vector string of each carrier wave of Pei Zhi substrate frequency band is transfused to inverse fourier transform circuit 58 like this.
It is time-domain from frequency domain transformation that inverse fourier transform circuit 58 makes the vector string of each carrier wave of the substrate frequency band that is generated by carrier wave configuration circuit 57, additional common employed protection interim and exporting.The output of 59 pairs of inverse fourier transform circuit 58 of quadrature modulation circuit is carried out quadrature modulation and is transformed to intermediate frequency band.Frequency-conversion circuit 60 is the frequency band that has carried out the ofdm signal of quadrature modulation a radio bands from middle frequency band transformation, offers antenna etc.
According to the formed dispensing device of above formation, just can be according to generating ofdm signal in the OFDM transmission means described in first and second embodiment.The 4th embodiment
Fig. 9 represents to receive according to the formed ofdm signal of OFDM transmission means of first and second embodiment and infers the formation of the receiving system of the impulse response in the time-domain of transmission path.
In Fig. 9, tuner 11 is transformed to Base Band to the frequency band of the ofdm signal that is received from radio bands.Fourier transform circuit 12 is transformed to frequency domain to the ofdm signal of Base Band from time-domain, as the vector string of each carrier wave of frequency domain and export.
Dispersion pilot extraction circuit 13 is extracted scattered pilot signal and necessary terminal pilot signal, band terminal pilot signal from the vector string of Fourier transform circuit 12 outputs.Vector generation circuit 14 takes place and the scattered pilot signal, terminal pilot signal and the corresponding modulated complex vector C of the band terminal pilot signal k that are extracted by dispersion pilot extraction circuit 13, n.
Scattered pilot signal, terminal pilot signal and the band terminal pilot signal that division circuit 15 will be extracted by dispersion pilot extraction circuit 13 will be divided by with the complex vector that produces with vector generation circuit 14, infer and scattered pilot signal, transmission path characteristic that the terminal pilot signal is relevant with the band terminal pilot signal.16 pairs of interpolating circuits carry out interpolation by division circuit 15 is resulting with scattered pilot signal, transmission path characteristic that the terminal pilot signal is relevant with the band terminal pilot signal, infer and synchronous detection with the relevant transmission path characteristic of carrier wave of the transmission information signal of section.
Delay circuit 17 postpones a code element to the vector string of Fourier transform circuit 12 outputs.Select circuit 18 according to by the control information kind of the section of transmission in addition, synchronous detection with the situation of section under the output of selection interpolating circuit 16 export; Select the output of delay circuit 17 under with the situation of section and export in differential detection.
Division circuit 19 is divided by the vector string of Fourier transform circuit 12 outputs respectively with the output of selecting circuit 18.In division circuit 19, use in the section at synchronous detection, carry out division arithmetic with the transmission path characteristic relevant and carry out synchronous detection with the corresponding respectively carrier wave of being inferred by interpolating circuit 16,, carry out division arithmetic with the vector string of corresponding carrier wave respectively before the code element of delay circuit 17 outputs and carry out differential detection with in the section in differential detection.
The rectified signal that modulation system (QPSK, 16QAM, 64QAM, DBPSK, DQPSK, the DAPSK etc.) demodulation of demodulator circuit 20 when generating transmission information signal exported from division circuit 19, and obtain the digital information transmitted.
By above formation, can receive ofdm signal and carry out demodulation according to the OFDM transmission means described in first embodiment.Formation described below is the situation that receives ofdm signal and carry out demodulation according to the OFDM transmission means described in second embodiment.
At first, continuous pilot is extracted the vector string extraction continuous pilot signal of circuit 21 from Fourier transform circuit 12 outputs.At this moment, even mix under the situation about existing with section with section and differential detection,, then can extract continuous pilot signal all the time because synchronous detection must mix existence with the continuous pilot signal of section at least at synchronous detection.
Vector generation circuit 22 takes place and extracts the corresponding modulated complex vector C of continuous pilot signal that circuit 21 is extracted by continuous pilot K, nDivision circuit 23 will extract the complex vector that continuous pilot signal that circuit 21 extracted and vector generation circuit 22 produce by continuous pilot and be divided by, and infer the transmission path characteristic relevant with continuous pilot signal.24 transmission path characteristic relevant with the continuous pilot signal that is drawn by division circuit 23 of inverse fourier transform circuit are time-domain from frequency domain transformation, and obtain the pusle response characteristics of transmission path.
As described above, formation according to the receiving system of present embodiment, in demodulator circuit 20, can realize high-quality demodulation by handle resulting filter effect by the interpolation of transmission path characteristic in section at synchronous detection, separate the demodulation that reception is moved in the variation of transferring to realize to be suitable for transmission path characteristic rapidly by differential between code element in section in differential detection.And, in inverse fourier transform circuit 24, can access the pusle response characteristics of the transmission path of not turning back.
As described above, orthogonal frequency-division multiplex transmission system of the present invention can have the differential detection section that is suitable for moving reception.At this moment, by having terminal pilot signal and band terminal pilot signal, can not damage the synchronous detection characteristic of the section that adjacent synchronous detection uses, and in each section the independent assortment synchronous detection with section and differential detection section, thus, can realize the flexible services state.
Can frequency of utilization the inverse fourier transform of configuration to being the continuous pilot signal of pulse type, during code element, obtain the pusle response characteristics of not turning back as required.
Like this, according to the present invention, a kind of OFDM mode and the dispensing device and the receiving system that are suitable for this mode are provided, this OFDM mode can partly import the modulation system that is suitable for moving reception while keeping all transmission capacities in the modulation of the carrier wave of transmitting digital information, and, configuration continuous pilot signal and can in the impulse response of the transmission path of inferring, not turning back by for example continuous pilot signal.

Claims (24)

1. OFDM (OFDM) transmission means modulates transmitting digital information to a plurality of carrier waves that have mutually orthogonal frequency relation in each code-element period, it is characterized in that:
In above-mentioned a plurality of carrier waves, the carrier wave of predetermined quantity is distributed to more than one section as a unit, give the band terminal pilot signal more than one allocation of carriers, use above-mentioned more than one section in each section, to use or differential detection usefulness respectively as synchronous detection;
Use in the section at above-mentioned synchronous detection, give the scattered pilot signal of the allocation of carriers of symbol time and frequency period dispersion with particular phases and this carrier wave of Modulation and Amplitude Modulation, the allocation of carriers of giving the frequency identical with each code element is modulated the additional information transmission signals of this carrier wave according to additional information by M (M is the natural number 2 or more) phase phase shift keying (M phase PSK) or the differential M phase phase shift keying on the code element direction, modulates the transmission information signal of this carrier wave for according to above-mentioned digital information above-mentioned carrier wave allocation of carriers in addition;
Use in the section in above-mentioned differential detection, modulate the additional information transmission signals of this carrier wave by M phase phase shift keying or the differential M phase phase shift keying on the code element direction according to additional information to the allocation of carriers of the frequency identical with each code element, give and to satisfy adjacent synchronous detection with the allocation of carriers of the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal of section terminal pilot signal, modulate the transmission information signal of this carrier wave for according to above-mentioned digital information allocation of carriers beyond the above-mentioned carrier wave with specific phase place and this carrier wave of Modulation and Amplitude Modulation;
Come to modulate this carrier wave with specific phase place and amplitude with the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal in the section with satisfying above-mentioned synchronous detection to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end.
2. OFDM (OFDM) transmission means modulates transmitting digital information to a plurality of carrier waves that have mutually orthogonal frequency relation in each code-element period, it is characterized in that:
In above-mentioned a plurality of carrier waves, the carrier wave of predetermined quantity is distributed to more than one section as a unit, give the band terminal pilot signal more than one allocation of carriers, use above-mentioned more than one section in each section, to use or differential detection usefulness respectively as synchronous detection;
Use in the section at above-mentioned synchronous detection, give the scattered pilot signal of the allocation of carriers of symbol time and frequency period dispersion with particular phases and this carrier wave of Modulation and Amplitude Modulation, give the continuous pilot signal of the allocation of carriers of the frequency identical with particular phases and this carrier wave of Modulation and Amplitude Modulation with each code element, the allocation of carriers of giving the frequency identical with each code element is modulated the additional information transmission signals of this carrier wave according to additional information by M phase phase shift keying or the differential M phase phase shift keying on the code element direction, modulates the transmission information signal of this carrier wave for according to above-mentioned digital information allocation of carriers beyond the above-mentioned carrier wave;
Use in the section in above-mentioned differential detection, give the continuous pilot signal of the allocation of carriers of the frequency identical with particular phases and this carrier wave of Modulation and Amplitude Modulation with each code element, modulate the additional information transmission signals of this carrier wave by M phase phase shift keying or the differential M phase phase shift keying on the code element direction according to additional information to the allocation of carriers of the frequency identical with each code element, give and to satisfy adjacent synchronous detection with the allocation of carriers of the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal of section terminal pilot signal, modulate the transmission information signal of this carrier wave for according to above-mentioned digital information allocation of carriers beyond the above-mentioned carrier wave with specific phase place and this carrier wave of Modulation and Amplitude Modulation;
Come to modulate this carrier wave with specific phase place and amplitude with the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal in the section with satisfying above-mentioned synchronous detection to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end.
3. orthogonal frequency-division multiplex transmission system according to claim 1 and 2, it is characterized in that above-mentioned synchronous detection is the common configuration of part with the frequency configuration of the said additional information transmission signals in the section and above-mentioned differential detection with the frequency configuration of the interior said additional information transmission signals of section.
4. orthogonal frequency-division multiplex transmission system according to claim 1 and 2, it is characterized in that, in above-mentioned synchronous detection usefulness section, the part of the frequency configuration of said additional information transmission signals as the frequency configuration of the said additional information transmission signals of above-mentioned differential detection usefulness section.
5. orthogonal frequency-division multiplex transmission system according to claim 2, it is characterized in that above-mentioned synchronous detection is the common configuration of part with the frequency configuration of the above-mentioned continuous pilot signal in the section and above-mentioned differential detection with the frequency configuration of the interior above-mentioned continuous pilot signal of section.
6. orthogonal frequency-division multiplex transmission system according to claim 2, it is characterized in that, in above-mentioned synchronous detection usefulness section, the part of the frequency configuration of above-mentioned continuous pilot signal as the frequency configuration of the above-mentioned continuous pilot signal of above-mentioned differential detection usefulness section.
7. according to each described orthogonal frequency-division multiplex transmission system of claim 1 to 6, it is characterized in that, in said additional information, comprise control information.
8. orthogonal frequency-division multiplex transmission system according to claim 7 is characterized in that, above-mentioned control information is transmitted by the differential two-phase phase shift keying (DBPSK) on the code element direction.
9. orthogonal frequency-division multiplex transmission system according to claim 7, it is characterized in that above-mentioned synchronous detection is the common configuration of part with the frequency configuration of the above-mentioned control information in the section and above-mentioned differential detection with the frequency configuration of the interior above-mentioned control information of section.
10. orthogonal frequency-division multiplex transmission system according to claim 7 is characterized in that, in above-mentioned synchronous detection usefulness section, the part of the frequency configuration of above-mentioned control information as the frequency configuration of the above-mentioned control information of above-mentioned differential detection usefulness section.
11. according to each described orthogonal frequency-division multiplex transmission system of claim 1 to 10, it is characterized in that, use in the section at above-mentioned synchronous detection, making number of carriers is N (N is the natural number more than 2), above-mentioned scattered pilot signal allocation is given the N carrier spacing and in each code element displacement the carrier wave of L (L is the approximate number of N) carrier wave.
12. according to each described orthogonal frequency-division multiplex transmission system of claim 1 to 11, it is characterized in that, above-mentioned synchronous detection with and differential detection usefulness section in, the inverse fourier transform of frequency configuration of each said additional information transmission signals being distributed to this additional information transmission signals is to the carrier wave of the frequency that becomes pulse type.
13. orthogonal frequency-division multiplex transmission system according to claim 2, it is characterized in that, above-mentioned synchronous detection with and differential detection with in the section, the inverse fourier transform of frequency configuration of each above-mentioned continuous pilot signal being distributed to this continuous pilot signal is to the carrier wave of the frequency that becomes the shape of pulsing.
14. orthogonal frequency-division multiplex transmission system according to claim 2, it is characterized in that, above-mentioned synchronous detection with and differential detection with in the section, the inverse fourier transform of each said additional information transmission signals and continuous pilot signal being distributed to the frequency configuration that this additional information transmission signals and continuous pilot signal are combined is to the carrier wave of the frequency that becomes the shape of pulsing.
15., it is characterized in that according to each described orthogonal frequency-division multiplex transmission system of claim 1 to 14, use in the section in above-mentioned synchronous detection usefulness and differential detection, use the carrier wave of same number.
16., it is characterized in that above-mentioned terminal pilot signal only is configured in the carrier wave of above-mentioned differential detection with the frequency band end of section according to each described orthogonal frequency-division multiplex transmission system of claim 1 to 15.
17. orthogonal frequency-division multiplex transmission system according to claim 1 is characterized in that,
By 13 sections with use the band terminal pilot tone of the carrier wave of a carrier wave to form, section is constituted the carrier wave of 1405 carrier waves of use in whole frequency band by the carrier wave of 108 carrier waves;
Above-mentioned synchronous detection with section by the scattered pilot signal of the carrier wave that uses 9 carrier waves in each code element, use 3 carrier waves carrier wave the additional information transmission signals and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted;
Above-mentioned differential detection with section by the additional information signal of the carrier wave that uses 11 carrier waves, use a carrier wave carrier wave the terminal pilot signal and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted.
18. orthogonal frequency-division multiplex transmission system according to claim 2 is characterized in that,
By 13 sections with use the band terminal pilot tone of the carrier wave of a carrier wave to form, section is constituted the carrier wave of 1405 carrier waves of use in whole frequency band by the carrier wave of 108 carrier waves;
Above-mentioned synchronous detection with section by the scattered pilot signal of the carrier wave that uses 9 carrier waves in each code element, use the carrier wave of 1 carrier wave the additional information transmission signals, use 2 carrier waves carrier wave continuous pilot signal and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted;
Above-mentioned differential detection with section by the additional information signal of the carrier wave that uses 5 carrier waves, use the carrier wave of 6 carrier waves continuous pilot signal, use a carrier wave carrier wave the terminal pilot signal and use the transmission information signal of the carrier wave of 96 carrier waves to be constituted.
19. the dispensing device of orthogonal frequency-division multiplex transmission system is characterized in that, has the device that generates ofdm signal by each described orthogonal frequency-division multiplex transmission system of claim 1 to 18.
20. the dispensing device of orthogonal frequency-division multiplex transmission system generates ofdm signal by the described orthogonal frequency-division multiplex transmission system of claim 1, it is characterized in that, comprising:
Inking device in above-mentioned a plurality of carrier waves, is distributed to more than one section to the carrier wave of predetermined quantity as a unit, and above-mentioned more than one section is distributed to synchronous detection usefulness or differential detection usefulness respectively in each section;
Signal generating apparatus generates above-mentioned scattered pilot signal, said additional information transmission signals, above-mentioned transmission information signal, above-mentioned terminal pilot signal, above-mentioned band terminal pilot signal respectively;
In above-mentioned inking device, come to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end with the periodic frequency of the frequency configuration of the above-mentioned scattered pilot signal in the section with satisfying above-mentioned synchronous detection, for above-mentioned synchronous detection section, the above-mentioned scattered pilot signal of allocation of carriers of disperseing for symbol time and frequency period ground, give the allocation of carriers said additional information transmission signals of the frequency identical with each code element, give the above-mentioned carrier wave above-mentioned transmission information signal of allocation of carriers in addition, for above-mentioned differential detection section, give the allocation of carriers said additional information transmission signals of the frequency identical, satisfy the periodic allocation of carriers above-mentioned terminal pilot signal of adjacent synchronous detection with the above-mentioned scattered pilot signal frequency configuration of section to frequency with each code element.
21. the dispensing device of orthogonal frequency-division multiplex transmission system generates ofdm signal by the described orthogonal frequency-division multiplex transmission system of claim 2, it is characterized in that, comprising:
Inking device, in above-mentioned a plurality of carrier waves, the carrier wave of predetermined quantity is distributed to more than one section as a unit, give the band terminal pilot signal more than one allocation of carriers, above-mentioned more than one section is distributed to synchronous detection usefulness or differential detection usefulness respectively in each section;
Signal generating apparatus generates above-mentioned scattered pilot signal, said additional information transmission signals, above-mentioned transmission information signal, above-mentioned terminal pilot signal, above-mentioned band terminal pilot signal, above-mentioned continuous pilot signal respectively;
In above-mentioned inking device, come to the above-mentioned band terminal pilot signal of the allocation of carriers of transmission band end with the periodic frequency of above-mentioned scattered pilot signal frequency configuration in the section with satisfying above-mentioned synchronous detection, for above-mentioned synchronous detection section, the above-mentioned scattered pilot signal of allocation of carriers of disperseing for symbol time and frequency period ground, give the above-mentioned continuous pilot signal of allocation of carriers of the frequency identical with each code element, give the allocation of carriers said additional information transmission signals of the frequency identical, give the above-mentioned carrier wave above-mentioned transmission information signal of allocation of carriers in addition with each code element; For above-mentioned differential detection section, give the above-mentioned continuous pilot signal of allocation of carriers of the frequency identical with each code element, give the allocation of carriers said additional information transmission signals of the frequency identical, satisfy the periodic allocation of carriers above-mentioned terminal pilot signal of adjacent synchronous detection with the frequency configuration of the above-mentioned scattered pilot signal of section to frequency with each code element.
22. the receiving system of orthogonal frequency-division multiplex transmission system is characterized in that, has ofdm signal that reception generated by each described orthogonal frequency-division multiplex transmission system of claim 1 to 18 and the device that carries out demodulation.
23. the receiving system of orthogonal frequency-division multiplex transmission system receives the ofdm signal that is generated by each described orthogonal frequency-division multiplex transmission system of claim 1 to 18 and carries out demodulation, it is characterized in that, comprising:
Fourier transform device is transformed to the signal of frequency domain to above-mentioned reception ofdm signal by Fourier transform from time-domain, thus, obtains representing the phase place of above-mentioned each carrier wave and the vector string of amplitude;
First extraction element is from the set of vectors by the resultant vector string extraction of this Fourier transform device and above-mentioned scattered pilot signal and above-mentioned terminal pilot signal and the corresponding carrier wave of above-mentioned band terminal pilot signal;
First devision device uses the set of vectors of being extracted by this first extraction element divided by above-mentioned particular phases and the amplitude of modulating above-mentioned scattered pilot signal and above-mentioned terminal pilot signal and above-mentioned band terminal pilot signal;
Filter apparatus, the output of level and smooth and this first devision device of interpolation on frequency direction and symbol time direction;
Deferred mount is during being postponed a code element by the resulting vector string of above-mentioned Fourier transform device;
Choice device is selected the output of above-mentioned filter apparatus when handling above-mentioned synchronous detection with the signal of section, select the output of above-mentioned deferred mount during with the signal of section in the above-mentioned differential detection of processing;
Second devision device, the vector string that will export from above-mentioned Fourier transform device be divided by the output signal of above-mentioned choice device, and obtain detection vector string and output.
24. the receiving system of orthogonal frequency-division multiplex transmission system receives the ofdm signal that is generated by the described orthogonal frequency-division multiplex transmission system of claim 13 and carries out demodulation, it is characterized in that, comprising:
Fourier transform device is transformed to the signal of frequency domain to above-mentioned reception ofdm signal by Fourier transform from time-domain, thus, obtains representing the phase place of above-mentioned each carrier wave and the vector string of amplitude;
Second extraction element is from being extracted the set of vectors of using the corresponding carrier wave of above-mentioned continuous pilot signal of section with above-mentioned synchronous detection with section and above-mentioned differential detection by the resultant vector string of this Fourier transform device;
The 3rd devision device, the set of vectors that will be extracted by this second extraction element is divided by the above-mentioned particular phases and the amplitude of the above-mentioned continuous pilot signal of modulation;
The inverse fourier transform device is the output of the 3rd devision device time-domain by inverse fourier transform from frequency domain transformation, thus, obtains the pusle response characteristics of transmission path.
CN98800917A 1997-07-01 1998-06-30 Orthogonal frequency-division multiplex transmission system, and its transmitter and receiver Pending CN1231089A (en)

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CNB031370411A Division CN1236610C (en) 1997-07-01 1998-06-30 QFDM transmissin mode, transmitter and receiver thereof
CN2006100958891A Division CN1980216B (en) 1997-07-01 1998-06-30 Transmitting method, receiving method, transmitting apparatus and receiving apparatus
CN2006100958868A Division CN1980213B (en) 1997-07-01 1998-06-30 Receiving method and receiving apparatus
CN2006100958872A Division CN1980214B (en) 1997-07-01 1998-06-30 Transmitting method, receiving method, transmitting apparatus and receiving apparatus

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CN2006100958868A Expired - Lifetime CN1980213B (en) 1997-07-01 1998-06-30 Receiving method and receiving apparatus
CN2006100958891A Expired - Lifetime CN1980216B (en) 1997-07-01 1998-06-30 Transmitting method, receiving method, transmitting apparatus and receiving apparatus
CN2006100958919A Expired - Lifetime CN1984112B (en) 1997-07-01 1998-06-30 Sending method, receiving method, sending device and receiving device
CN98800917A Pending CN1231089A (en) 1997-07-01 1998-06-30 Orthogonal frequency-division multiplex transmission system, and its transmitter and receiver
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