WO2015045078A1 - Dispositif d'émission, dispositif de réception, et procédé d'émission de signal - Google Patents

Dispositif d'émission, dispositif de réception, et procédé d'émission de signal Download PDF

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Publication number
WO2015045078A1
WO2015045078A1 PCT/JP2013/076148 JP2013076148W WO2015045078A1 WO 2015045078 A1 WO2015045078 A1 WO 2015045078A1 JP 2013076148 W JP2013076148 W JP 2013076148W WO 2015045078 A1 WO2015045078 A1 WO 2015045078A1
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Prior art keywords
transmission
stations
transmitting
signal
space
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PCT/JP2013/076148
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English (en)
Japanese (ja)
Inventor
慎悟 朝倉
研一 村山
誠 田口
拓也 蔀
澁谷　一彦
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日本放送協会
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Priority to PCT/JP2013/076148 priority Critical patent/WO2015045078A1/fr
Publication of WO2015045078A1 publication Critical patent/WO2015045078A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation

Definitions

  • the present invention relates to a transmission apparatus, a reception apparatus, and a signal transmission method in a transmission system that performs MIMO (Multi-Input Multi-Output) transmission using a plurality of OFDM (Orthogonal Frequency Division Multiplexing) signals.
  • MIMO Multi-Input Multi-Output
  • OFDM Orthogonal Frequency Division Multiplexing
  • ISDB-T Integrated Services Digital Broadcasting Terrestrial
  • a Japanese terrestrial digital broadcasting system realizes high-definition broadcasting (or multiple standard image quality broadcasting) for fixed receivers.
  • next-generation terrestrial digital broadcasting system it is required to provide services with a larger amount of information such as 3D high-definition broadcasting and super high-definition with 16 times the resolution of high-definition instead of conventional high-definition. Therefore, a MIMO system that performs MIMO transmission using a plurality of transmission / reception antennas has been proposed as a technique for expanding the data transmission capacity by radio.
  • SDM space division multiplexing
  • STC space-time codes
  • the first feature is that a transmission station having a plurality of antennas has a plurality of transmission stations, and in a system to which the first scheme and the second scheme can be applied, the plurality of transmission stations should transmit to the receiving apparatus.
  • a transmission device that generates a signal comprising: a transmission unit that transmits a control signal including information indicating which of the first method and the second method should be applied to the reception device; Is a method of performing space-time coding using a plurality of antennas provided in different transmission stations and performing space division multiplexing using a plurality of antennas provided in each of the plurality of transmission stations.
  • space division multiplexing is performed using a plurality of antennas provided in each of the plurality of transmission stations without performing space-time coding using a plurality of antennas provided in different transmission stations.
  • a method of performing is performed using a plurality of antennas provided in each of the plurality of transmission stations without performing space-time coding using a plurality of antennas provided in different transmission stations.
  • the first scheme is applied to the transmission stations adjacent to each other when the transmission areas of the transmission stations adjacent to each other among the plurality of transmission stations overlap.
  • the second scheme is applied to the adjacent transmission stations when the transmission areas of the adjacent transmission stations among the plurality of transmission stations do not overlap.
  • information indicating which of the first method and the second method should be applied is represented by 1 bit.
  • information indicating which of the first method and the second method should be applied is included in a transmission control signal including a transmission parameter.
  • the second feature has a plurality of transmitting stations as transmitting stations having a plurality of antennas.
  • OFDM symbols transmitted from the plurality of transmitting stations are transmitted.
  • a receiving device for receiving comprising: a receiving unit that receives a control signal including information indicating which of the first method and the second method should be applied, wherein the first method is different from each other Is a system that performs space-time coding using a plurality of antennas provided in the antenna and performs space division multiplexing using a plurality of antennas provided in each of the plurality of transmitting stations, and the second system is different from each other.
  • a third feature is that a plurality of transmitting stations are provided as transmitting stations having a plurality of antennas, and the plurality of transmissions are transmitted from a transmitting apparatus to a receiving apparatus in a system to which the first scheme and the second scheme are applicable.
  • a signal transmission method for transmitting a signal via a station, the control signal including information indicating which of the first method and the second method should be applied from the transmitting device to the receiving device The first method performs space-time coding using a plurality of antennas provided in different transmission stations, and also includes a plurality of transmission stations provided in each of the plurality of transmission stations.
  • a method of performing space division multiplexing using an antenna wherein the second method uses the plurality of transmitting stations without performing space-time coding using a plurality of antennas provided in different transmitting stations.
  • FIG. 1 is a block diagram showing a configuration of a transmission apparatus according to the first embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a 4 ⁇ 2 MIMO system including a transmission device and a reception device according to the first embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a transmission area of a transmission station.
  • FIG. 4 is a block diagram showing a configuration of the OFDM modulation unit in the transmission apparatus according to the first embodiment of the present invention.
  • FIG. 5 is a block diagram showing a configuration of the receiving apparatus according to the first embodiment of the present invention.
  • FIG. 6 is a block diagram showing a configuration of an OFDM demodulator in the receiving apparatus according to the first embodiment of the present invention.
  • FIG. 1 is a block diagram showing a configuration of a transmission apparatus according to the first embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a 4 ⁇ 2 MIMO system including a transmission device and a reception device according to the first embodiment of
  • FIG. 7 is a diagram illustrating a 2 ⁇ 2 MIMO system including a transmission device and a reception device according to the first embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an arrangement example of pilot signals of OFDM signals transmitted by the transmission apparatus according to the first embodiment of the present invention.
  • FIG. 1 is a block diagram illustrating a configuration example of a transmission apparatus according to the first embodiment of the present invention.
  • the transmission apparatus 1 includes an error correction encoding unit 10 (10-1 and 10-2), a carrier modulation unit 11 (11-1 and 11-2), and a space-time encoding unit 12 (12-1 and 12-2) and an OFDM modulation unit 13.
  • the input signal to the transmission apparatus 1 is two TS (Transport Stream) signals (TS1 and TS2).
  • a TS dividing device or the like may be arranged before the input of the transmission apparatus 1 and a TS signal after dividing one system TS into two systems may be input to the transmission apparatus 1.
  • the transmitting apparatus 1 outputs four types of OFDM signals in two systems, and the two types of OFDM signals are transmitted to a first transmitting station 14-1 (hereinafter referred to as “transmitting station A”), and the remaining two types of OFDM signals Is transmitted to the second transmitting station 14-2 (hereinafter referred to as “transmitting station B").
  • the error correction coding unit 10 performs error correction coding on the TS signal and outputs it to the carrier modulation unit 11.
  • error correction for example, a BCH code is used as an outer code, and an LDPC (Low Density Parity Check) code is used as an inner code.
  • LDPC Low Density Parity Check
  • Carrier modulation section 11-1 maps the transmission signal to the IQ plane for each subcarrier according to a predetermined modulation scheme, generates first carrier modulation signal a, and outputs the first carrier modulation signal a to space-time coding section 12-1 To do.
  • Carrier modulation section 11-2 maps the transmission signal to the IQ plane for each subcarrier according to a predetermined modulation scheme, generates second carrier modulation signal b, and outputs it to space-time coding section 12-2 To do.
  • the space-time encoding unit 12 performs space-time encoding on the carrier modulation signal generated by the carrier modulation unit 11 to generate a space-time encoded signal, and outputs the generated signal to the OFDM modulation unit 13.
  • Alamouti STBC Space-Time Block Coding
  • the space-time coding unit 12-1 uses the first carrier modulation signal a generated by the carrier modulation unit 11-1 as the space-time coding.
  • Encoding (STBC encoding) is performed to generate a first space-time encoded signal a 1 and a second space-time encoded signal a 2 , and output them to the OFDM modulator 13.
  • the space-time coding unit 12-2 performs space-time coding (STBC coding) on the second carrier modulation signal b generated by the carrier modulation unit 11-2 and performs third space-time coding.
  • STBC coding space-time coding
  • the signal b 1 and the fourth space-time encoded signal b 2 are generated and output to the OFDM modulation unit 13.
  • m represents a certain discrete time
  • * represents a complex conjugate.
  • the OFDM modulation unit 13 inserts a pilot signal and a control signal into the four types of space-time encoded signals (a 1 , a 2 , b 1 , b 2 ) generated by the space-time encoding unit 12 to provide two systems 4 A type of OFDM signal is generated and transmitted to transmitting station A and transmitting station B.
  • the OFDM modulation unit 13 transmits the OFDM signals of the first space-time encoded signal and the third space-time encoded signal (a 1 , b 1 ) to the transmitting station A, and the second space-time code And the OFDM signal of the fourth space-time encoded signal (a 2 , b 2 ) are transmitted to the transmitting station B. That is, the transmission apparatus 1 performs STBC encoding with the transmission stations A and B as a set.
  • the transmitting station 14-1 (transmitting station A) performs MIMO transmission by SDM from the transmitting antennas A-tx1 and A-tx2.
  • the transmission station 14-2 (transmission station B) performs MIMO transmission by SDM from the transmission antennas B-tx1 and B-tx2.
  • the transmitting station 14 implements SDM by using one of two antennas as a horizontally polarized wave and the other as a vertically polarized wave.
  • FIG. 2 is a diagram illustrating a 4 ⁇ 2 MIMO system including a transmission apparatus and a reception apparatus according to the present invention.
  • the signals ⁇ a 1 (m), a 2 (m), b 1 (m), b 2 (m) ⁇ transmitted from the two transmitting stations 14 at time m are ⁇ x 1 , x 2 , X 3 , x 4 ⁇ , which are all different signals. Therefore, even when the D / U ratio of inter-SFN interference becomes 0 dB, frequency selective fading due to inter-SFN interference can be prevented.
  • FIG. 3 is a diagram showing an example of the transmission area (broadcast area, service area) of the transmission station.
  • four transmission stations A, B, C and D and their transmission areas a, b, c and d are shown.
  • STBC encoding with the transmitting stations A and B as a set
  • STBC encoding with the transmitting stations C and D as a set
  • signals transmitted from the transmitting stations A and C and transmitted from the transmitting stations B and D are transmitted.
  • the different signals can be different signals.
  • symbols A and C are circled to indicate that the signals transmitted from the transmitting stations A and C are the same.
  • the symbols B and D are enclosed by squares.
  • the receiving device located in the area where the transmission areas a and b overlap receives the signals transmitted from the transmitting stations A and B at the same time, but the signals transmitted from the transmitting stations A and B are different. Frequency selective fading due to interference can be prevented.
  • a receiving device located in an area where the transmission areas a and d overlap each other receives signals transmitted from the transmission stations A and D at the same time, but the signals transmitted from the transmission stations A and D are different. , Frequency selective fading due to inter-SFN interference can be prevented.
  • FIG. 4 is a block diagram showing a configuration of the OFDM modulation unit 13. As shown in FIG. 4, the OFDM modulation unit 13 includes a pilot / control signal insertion unit 130 and an OFDM signal generation unit 134.
  • the pilot / control signal insertion unit 130 includes pilot signals (SP signals) having different patterns and control for the four types of transmission signals (a 1 , b 1 , a 2 , b 2 ) generated by the space-time encoding unit 12.
  • a signal (TMCC signal or AC signal) is inserted to generate four types of OFDM symbols. More specifically, pilot / control signal insertion section 130 includes pilot signal generation section 131, control signal generation section 132, and OFDM symbol configuration section 133 (133-1 to 133-4).
  • Pilot signal generation section 131 has a predetermined amplitude and phase, generates a pilot signal for inserting a pilot signal for estimating a transmission path response at a predetermined position, and OFDM symbol configuration section 133 Output to.
  • the control signal generation unit 132 has a predetermined amplitude and phase, generates a control signal for inserting a control signal for notifying the receiving apparatus of control information at a predetermined position, and generates an OFDM symbol configuration Output to the unit 133.
  • the control information includes information on transmission parameters such as a carrier modulation scheme, an interleave length, and the number of segments.
  • the OFDM symbol configuration unit 133 inserts the pilot signal and control signal input from the pilot signal generation unit 131 into the four types of transmission signals (a1, b1, a2, and b2) input from the carrier modulation unit 11.
  • the OFDM symbols are generated by arranging them and output to the OFDM signal generator 134.
  • the OFDM signal generation unit 134 generates four types of OFDM signals by performing inverse Fourier transform and orthogonal modulation on each carrier of the four types of OFDM symbols generated by the pilot / control signal insertion unit 130, and transmits the four types of OFDM signals via the transmission station 14. Output to four transmission antennas A-tx1, A-tx2, B-tx1, and B-tx2. More specifically, the OFDM signal generation unit 134 includes an inverse Fourier transform unit 135 (135-1 and 135-2), a GI addition unit 136 (136-1 and 136-2), and an orthogonal modulation unit 137 (137-). 1 and 137-2) and a D / A converter 138 (138-1 and 138-2). In order to synchronize the four OFDM signals, the OFDM signal generation unit 134 supplies a clock having the same frequency to each block.
  • the inverse Fourier transform unit 135 performs an IFFT (Inverse Fast Fourier Transform) process on the OFDM symbol input from the OFDM symbol configuration unit 133 to generate an effective symbol signal in the time domain, and adds a GI Output to the unit 136.
  • IFFT Inverse Fast Fourier Transform
  • the GI adding unit 136 inserts a guard interval obtained by copying the latter half of the effective symbol signal at the head of the effective symbol signal input from the inverse Fourier transform unit 135 and outputs the guard interval to the orthogonal modulation unit 137.
  • the guard interval is inserted in order to reduce intersymbol interference when receiving an OFDM signal, and is set so that the delay time of the multipath delay wave does not exceed the guard interval length.
  • the orthogonal modulation unit 137 performs orthogonal modulation processing on the baseband signal input from the GI addition unit 136 to generate an OFDM signal, and outputs the OFDM signal to the D / A conversion unit 138.
  • the D / A conversion unit 138 converts the OFDM signal input from the quadrature modulation unit 137 into an analog signal.
  • the receiving device receives the OFDM signal transmitted from the transmitting device 1 via a plurality of receiving antennas.
  • the OFDM signal receiver 2 includes an OFDM demodulator 20, a space-time code decoder 21, a carrier demodulator 22 (22-1 and 22-2), and an error correction code decoder 23. (23-1 and 23-2).
  • the OFDM demodulator 20 demodulates the received four systems of four types of OFDM signals to generate two types of baseband signals (c 1 , c 2 ), and uses two types of transmission path responses (h 1 , h 2 ).
  • FIG. 6 is a block diagram showing a configuration of the OFDM demodulator 20.
  • the OFDM demodulator 20 includes an A / D converter 200 (200-1 and 200-2), an orthogonal demodulator 201 (201-1 and 201-2), and a GI remover 202 ( 202-1 and 202-2), Fourier transform unit 203 (203-1 and 203-2), control signal extraction unit 204, pilot signal generation unit 205, and pilot signal extraction unit 206 (206-1 and 206). -2), a transmission path response estimation section 207 (207-1 and 207-2), and a transmission path response interpolation section 208 (208-1 and 208-2).
  • the A / D conversion unit 200 converts an analog reception signal input from the reception antenna rx into a digital signal and outputs the digital signal to the orthogonal demodulation unit 201.
  • the orthogonal demodulation unit 201 generates a baseband signal for the signal input from the A / D conversion unit 200 and outputs the baseband signal to the GI removal unit 202.
  • the GI removal unit 202 removes the guard interval from the signal input from the quadrature demodulation unit 201 to extract an effective symbol signal, and outputs it to the Fourier transform unit 203.
  • the Fourier transform unit 203 performs FFT (Fast Fourier Transform) processing on the effective symbol signal extracted by the GI removal unit 202 to generate complex baseband signals c 1 and c 2, and generates a pilot signal.
  • the data is output to the extraction unit 206.
  • the control signal extraction unit 204 extracts a control signal from the complex baseband signals c 1 and c 2 generated by the Fourier transform unit 203 and outputs control information to the pilot signal generation unit 205.
  • Pilot signal generation section 205 generates a pilot signal having the same amplitude and phase as the pilot signal inserted by transmission apparatus 1 and outputs the position information of the pilot signal inserted by transmission apparatus 1 to pilot signal extraction section 206.
  • the amplitude value and phase value of the pilot signal are output to the transmission path response estimation unit 207.
  • the pilot signal extraction unit 206 extracts a pilot signal from the complex baseband signals c 1 and c 2 generated by the Fourier transform unit 203 based on the position information input from the pilot signal generation unit 205, and estimates the transmission channel response. Output to the unit 207.
  • the transmission path response estimation unit 207 calculates a transmission path response using the pilot signal extracted by the pilot signal extraction unit 206.
  • Transmission path response interpolation section 208 performs transmission path response interpolation processing based on part or all of the transmission path response calculated by transmission path response estimation section 207, and calculates transmission path responses for all subcarriers.
  • the space-time code decoding unit 21 transmits channel responses h 11 , h 12 , h 13 , h calculated by the channel response estimation unit 207 from the complex baseband signals c 1 and c 2 generated by the Fourier transform unit 203. 14, space-time code decoding is performed using h 21 , h 22 , h 23 , and h 24 to generate a carrier modulation signal.
  • the space-time code decoding method will be described below.
  • Complex baseband signals c 1 and c 2 that are input to the space-time code decoding unit 21 are complex baseband signals a 1 , a 2 , b 1 , and b 2 transmitted from the transmission device 1, and the following formula (1 It is considered that noises z 1 and z 2 are added through a transmission line having a transmission line response h represented by). Therefore, the complex baseband signals c 1 and c 2 are expressed by the following equation (2).
  • Equation (2) From Equations (2) and (4), STBC decoding is equivalent to finding x 1 , x 2 , x 3 , and x 4 by solving the following Equation (5).
  • Equation (4) ZF (Zero Forcing), MMSE (Minimum Mean Square Error), MLD (Maximum Likelihood Detection), etc. can be applied.
  • ZF Zero Forcing
  • MMSE Minimum Mean Square Error
  • MLD Maximum Likelihood Detection
  • the space-time code decoding unit 21 includes the complex baseband signals c 1 and c 2 , the transmission path responses h 11 , h 12 , h 13 , h 14 and the transmission path response h that are input from the OFDM demodulation unit 20. 21 , h 22 , h 23 , h 24, and carrier modulation signals x 1 , x 2 , x 3 , x 4 (ie, a (m), a (m + 1), b (m) according to equation (7) , B (m + 1)).
  • SFBC Space-Frequency Block Coding
  • the carrier demodulation unit 22 demodulates the carrier modulation signal generated by the space-time code decoding unit 21 for each subcarrier, and outputs the demodulated signal to the error correction code decoding unit 23.
  • the error correction code decoding unit 23 performs error correction on the signal input from the carrier demodulation unit 22 and decodes the signal transmitted from the transmission device 1.
  • the transmission apparatus 1 constructs STC-MIMO between a plurality of transmission stations 14, generates a modulated wave having a complex conjugate relationship, and performs MIMO transmission by SDM from each of the two antennas of the plurality of transmission stations 14. I do.
  • the receiving apparatus 2 uses two antennas, and each performs STC reception.
  • signals ⁇ a 1 (m), a 2 (m), b 1 (m), b 2 (m) ⁇ is ⁇ x 1 , x 2 , x 3 , x 4 ⁇ , which are all different signals. Therefore, even when the D / U ratio of SFN interference becomes 0 dB, frequency selective fading can be prevented.
  • FIG. 7 is a diagram illustrating a 2 ⁇ 2 MIMO system including a transmission device and a reception device according to the present invention.
  • the receiving apparatus 2 receives only a signal transmitted from one transmitting station A, 2 ⁇ 2 MIMO transmission is performed as shown in FIG.
  • the receiving apparatus 2 receives only the space-time encoded signals a 1 and b 1 , and there is no data redundancy and a diversity effect cannot be obtained, but the signal ⁇ a 1 (m), a 1 (m + 1), b 1 (m), b 1 (m + 1) ⁇ are ⁇ x 1 , ⁇ x * 2 , x 3 , ⁇ x * 4 ⁇ as described above, and the transmission signal x1, x2, x3, and x4 can be transmitted.
  • the receiving apparatus 2 receives only the transmission signal of the transmitting station B, it means that only the signals a 2 and b 2 are received, and the transmission signals x 1 , x 2 , x 3 , and x 4 are transmitted. Is possible. Therefore, in a transmission area (isolated transmission area) that is isolated without being adjacent to the transmission areas of other transmission stations as in the transmission area c shown in FIG. 3, the transmission path response may be calculated as 2 ⁇ 2 MIMO.
  • the receiving device 2 cannot determine whether or not the installed area is an isolated transmission area.
  • the receiving apparatus 2 always calculates the transmission path response as 4 ⁇ 2 MIMO
  • a noise component instead of 0 is applied to a part of the transmission path response of the above formula (1).
  • the components of the transmission path response of the above formula (1) are h 13 , h 14 , h 23 , h 24 A noise component is applied instead of zero.
  • the decoding accuracy is worse than when the transmission path response is calculated as 2 ⁇ 2 MIMO.
  • the receiving apparatus 2 demodulates 4 ⁇ 2 MIMO using all of the four patterns of OFDM signals, only the patterns 1 and 2 or only the patterns 3 and 4 are used.
  • the symbol period for interpolation of the transmission path response is long, there is a possibility that the reception level may vary with time, and the dynamic characteristics deteriorate.
  • the symbol period required for interpolation of the transmission path response is 8 symbols, and when demodulating 4 ⁇ 2 MIMO, the symbol period required for interpolation of the transmission path response is 16 symbols.
  • the diversity effect due to STC can be expected by setting it to 4 ⁇ 2 MIMO, but if it is an isolated transmission area, not only the diversity effect due to STC cannot be expected when it is set to 4 ⁇ 2 MIMO. Dynamic characteristics will deteriorate.
  • the transmission apparatus 1 uses a transmission control signal such as a TMCC signal to determine whether the transmission area of the transmission station 14 is an isolated transmission area that is not adjacent to the transmission areas of other transmission stations.
  • the receiving apparatus 2 determines the MIMO demodulation method based on the transmission area information. For example, when the transmission area is not an isolated transmission area, the reception device 2 decodes the STC-SFN with 4 ⁇ 2 MIMO. On the other hand, when the transmission area of the transmission station 14 is an isolated transmission area, the receiving apparatus 2 decodes as 2 ⁇ 2 MIMO, thereby improving the dynamic characteristics as compared with the case of decoding as 4 ⁇ 2 MIMO STC-SFN. can do.
  • the transmission control signal is a data carrier obtained by performing MIMO-OFDM modulation on data such as a TS (Transport Stream) signal, such as a TMCC signal, after performing processing such as error correction coding / mapping.
  • a TS Transport Stream
  • TMCC Transport Stream
  • the transmission control signal is mapped to a carrier different from the data carrier in the OFDM frame.
  • the receiving apparatus 2 can perform MIMO depending on whether the transmission signals of both the transmission stations A and B can be received, only the transmission signal of the transmission station A can be received, or only the transmission signal of the transmission station B can be received.
  • the demodulation process is different. Therefore, the pilot signal arrangement pattern (hereinafter referred to as “pilot pattern”) generated by the pilot signal generation unit 131 of the transmission apparatus 1 can separate four signals transmitted from the two transmission stations A and B on the reception side. In addition, it is necessary to make the pattern separable on the receiving side even with only two signals transmitted from one transmitting station.
  • FIG. 8 is a diagram illustrating an example of a pilot pattern of an OFDM signal transmitted by the transmission apparatus 1.
  • Patterns 1 to 4 indicate pilot patterns of OFDM signals transmitted from the respective transmission antennas.
  • a circle means a null pilot signal with no signal.
  • 1 and -1 mean that the pilot signals are inverted in sign.
  • Others mean non-pilot signals such as data signals and control signals.
  • the right direction is the carrier (frequency) direction, and the downward direction is the symbol (time) direction.
  • Pilot signal generating section 131 generates pilot signals shown in patterns 1 and 2 for transmitting station A, and generates pilot signals shown in patterns 3 and 4 for transmitting station B.
  • the OFDM signal of pattern 1 is transmitted from the transmission antenna A-tx1 of the transmission station A
  • the OFDM signal of pattern 2 is transmitted from the transmission antenna A-tx2 of the transmission station A
  • the transmission antenna B-tx1 of the transmission station B is transmitted.
  • the pattern 3 OFDM signal is transmitted
  • the pattern 4 OFDM signal is transmitted from the transmission antenna B-tx2 of the transmission station B.
  • the control signal generator 132 generates a control signal for notifying control information including transmission area information indicating whether or not the transmission area of the transmission station 14 is an isolated transmission area.
  • the transmission apparatus 1 can notify the reception apparatus 2 whether or not the transmission area of the transmission station 14 is an isolated transmission area.
  • the transmission area information can be 1-bit information indicating whether or not the transmission area of the transmission station 14 is an isolated transmission area.
  • the receiving device 2 cannot determine whether the transmitting station is A or B only with 1-bit transmission area information indicating whether or not the transmission area is an isolated transmission area. This can be dealt with by fixing the pilot pattern to either one of the transmitting stations A and B. Alternatively, the receiving apparatus 2 may determine the pilot pattern so that the error is smaller after the transmitting station demodulates using both A and B pilot patterns.
  • control signal generation unit 132 indicates transmission area information 2 indicating whether the transmission area of the transmission station 14 is an isolated transmission area and whether the transmission station 14 is the transmission station A or the transmission station B. It can be bit information.
  • the control signal generation unit 132 may use the transmission area information as ID information for identifying the transmission station 14.
  • one bit of the transmission area information is a transmission signal type bit for distinguishing signals transmitted from the transmission station. That is, when the transmitting station 14 transmits the OFDM signals of the first space-time encoded signal and the third space-time encoded signal (a 1 , b 1 ), the transmission signal type bit is set to 0, and the transmitting station When 14 transmits OFDM signals of the second space-time encoded signal and the fourth space-time encoded signal (a 2 , b 2 ), the transmission signal type bit is set to 1.
  • transmitting stations A and C transmit OFDM signals of space-time encoded signals (a 1 , b 1 ), and transmitting stations B and D transmit OFDM signals of space-time encoded signals (a 2 , b 2 ).
  • IDs of transmitting stations A, B, C, and D are 00, 10, 01, and 11, respectively.
  • the type of transmission signal can be identified at the same time as identifying the transmission station 14 by the ID.
  • the reception device 2 can determine that it is an isolated transmission area because there is only one transmission station.
  • the control signal extraction unit 204 extracts a control signal from the complex baseband signals c 1 and c 2 input from the Fourier transform unit 203.
  • the control information is output not only to the pilot signal generation unit 205 but also to the transmission path response estimation unit 207.
  • pilot signal generation unit 205 determines from the transmission area information that the transmission area is not an isolated transmission station area, the pilot signal generation unit 205 generates four types of pilot signals. Pilot signal generation section 205 generates two types of pilot signals when it is determined from the transmission area information that the transmission area is an isolated transmission area.
  • the transmission path response estimation unit 207 calculates a transmission path response using four types of pilot signals. Further, when it is determined from the transmission area information that the transmission area is an isolated transmission station area, the transmission path response estimation unit 207 calculates a transmission path response using two types of pilot signals.
  • 4 ⁇ 2 MIMO (first scheme) and 2 ⁇ 2 MIMO (second scheme) are applicable to the system according to the embodiment.
  • 4 ⁇ 2 MIMO (first scheme) uses a plurality of antennas (for example, A-tx1 and B-tx1 shown in FIG. 2 or A-tx2 and B-tx2 shown in FIG. 2) provided in different transmission stations.
  • STC Space Time Codes
  • 2 ⁇ 2 MIMO (second scheme) is used for a plurality of antennas (for example, A-tx1 and B-tx1 shown in FIG. 2 or A-tx2 and B- A plurality of antennas (for example, A-tx1 and A-tx2 shown in FIG. 2 or the like shown in FIG. 2), without performing space-time coding (STC: Space Time Codes) using tx2).
  • STC Space Time Codes
  • the transmission apparatus 1 transmits a control signal including information indicating which of 4 ⁇ 2 MIMO (first scheme) and 2 ⁇ 2 MIMO (second scheme) should be applied to the reception device 2.
  • 4 ⁇ 2 MIMO (first scheme) may be applied to transmission stations adjacent to each other when the transmission areas of the transmission stations adjacent to each other among a plurality of transmission stations overlap.
  • 2 ⁇ 2 MIMO (second scheme) is preferably applied to adjacent transmission stations when the transmission areas of the adjacent transmission stations among the plurality of transmission stations do not overlap.
  • the embodiment is not limited to this.
  • the 4 ⁇ 2 MIMO (first method) or 2 ⁇ 2 MIMO (second method) method to be applied is determined according to the position of the transmitting stations adjacent to each other, the geographical conditions around each transmitting station, and the like. May be.
  • the transmission apparatus 1 transmits the transmission area information indicating whether the transmission area of the transmission station 14 is an isolated transmission area that is not adjacent to the transmission areas of other transmission stations (that is, 4 A control signal including information indicating which of ⁇ 2 MIMO (first scheme) and 2 ⁇ 2 MIMO (second scheme) is to be transmitted is transmitted.
  • 4 ⁇ 2 MIMO STC ⁇ is used using four types of pilot signals. Decode as SFN.
  • decoding is performed as STC-SFN with 2 ⁇ 2 MIMO, so that dynamic characteristics are improved as compared with a case where decoding is always performed as STC-SFN with 4 ⁇ 2 MIMO. Will be able to.
  • space-time encoded signals a 1 , a 2 , b 1 , and b 2 are obtained by STBC encoding.
  • the value is as follows.
  • frequency selective fading due to inter-SFN interference can be prevented, which is useful for any application that performs MIMO transmission.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un système, qui comprend une pluralité de stations d'émission (14-1, 14-2) comme stations d'émission ayant une pluralité d'antennes, et qui peut adopter un premier procédé et un second procédé, un dispositif d'émission (1), qui génère un signal à émettre en provenance de la pluralité de stations d'émission à un dispositif de réception (2), comprenant une unité d'émission qui émet au dispositif de réception un signal de commande contenant des informations indiquant lequel du premier procédé et du second procédé doit être adopté, le premier procédé étant un procédé pour réaliser un codage spatio-temporel à l'aide d'une pluralité d'antennes situées sur différentes stations d'émission, et réaliser un multiplexage de division d'espace à l'aide de la pluralité d'antennes situées respectivement sur la pluralité de stations d'émission, et le second procédé étant un procédé pour réaliser un multiplexage de division d'espace à l'aide de la pluralité d'antennes situées respectivement sur la pluralité de stations d'émission, sans réaliser de codage spatio-temporel à l'aide de la pluralité d'antennes situées sur différentes stations d'émission.
PCT/JP2013/076148 2013-09-26 2013-09-26 Dispositif d'émission, dispositif de réception, et procédé d'émission de signal WO2015045078A1 (fr)

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TWI742475B (zh) * 2018-12-10 2021-10-11 日商索尼股份有限公司 送訊裝置、送訊方法、收訊裝置、及收訊方法

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JP2011250186A (ja) * 2010-05-27 2011-12-08 Kyocera Corp 無線基地局、無線通信システムおよび無線通信方法
JP2012525739A (ja) * 2009-05-25 2012-10-22 富士通株式会社 通信装置、通信方法、及び基地局
JP2013030878A (ja) * 2011-07-27 2013-02-07 Kyocera Corp 無線通信装置及び無線通信システム

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JP2019149597A (ja) * 2018-02-26 2019-09-05 三菱電機株式会社 無線通信システム
JP7065639B2 (ja) 2018-02-26 2022-05-12 三菱電機株式会社 無線通信システム
TWI742475B (zh) * 2018-12-10 2021-10-11 日商索尼股份有限公司 送訊裝置、送訊方法、收訊裝置、及收訊方法
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