JP5498877B2 - Transmitting apparatus and receiving apparatus in polarization MIMO transmission system - Google Patents

Description

  The present invention relates to a polarization MIMO transmission system using polarization MIMO (Multiple Input / Multiple Output), and more particularly to a transmission device and a reception device in a polarization MIMO transmission system using a polarization MIMO scheme.

  In a transmission system using the MIMO scheme (hereinafter referred to as a “polarization MIMO transmission system”), a transmission device, for example, allocates a plurality of different data signals provided in a broadcasting station to each of a plurality of transmission antennas. The OFDM signal is transmitted by a broadcast wave on the same frequency or in a state where frequency bands overlap. This OFDM signal is transmitted through a plurality of channels, and the receiving apparatus receives the plurality of OFDM signals by a plurality of receiving antennas and propagates from each of the plurality of OFDM signals. By estimating and separating the transfer function for each path, it is possible to demodulate a plurality of different data signals transmitted from the transmission apparatus.

  There is also known a communication system that uses a MIMO system composed of a plurality of antennas having different polarization directions (hereinafter referred to as “polarization MIMO communication system”) (see, for example, Patent Document 1). In this communication system, in order to perform adaptive reception in an adaptive manner corresponding to a sequentially changing reception environment, a method in which a distance between antenna elements is increased to some extent and an antenna element having a different polarization direction are installed. This is a technology for receiving by using different combinations.

  On the other hand, as illustrated in FIG. 5, a general polarization MIMO transmission system includes a transmission device 100 including N transmission antennas 101 and a reception device 200 including M reception antennas 201. An example is shown. For example, the transmission apparatus 100 allocates N different data signals provided in a broadcasting station to each of the N transmission antennas 101, and transmits OFDM signals by broadcast waves on the same frequency or in a state where frequency bands overlap each other. Is a terminal device. In the example illustrated in FIG. 5, the OFDM signal transmitted from the transmission apparatus 100 is transmitted through a plurality of channels. The receiving device 200 is, for example, a base station device, a relay station device, or a mobile terminal, and estimates and separates the transfer function for each propagation path that has passed from the received multiple-system OFDM signals, and is transmitted from the transmitting device 100 A plurality of different data signals can be demodulated. In the polarization MIMO transmission system, it is configured with two transmitting antennas (N = 2) and two receiving antennas (M = 2) in FIG. 5, where # 1 is horizontal polarization and # 2 is on the transmitting side and the receiving side, respectively. Used as vertical polarization.

  In broadcasting using MIMO, propagation path information cannot be shared with a specific receiving apparatus on the transmission side, so it is important to efficiently separate a plurality of signals transmitted by MIMO on the reception side. For example, as shown in FIG. 6, in the case of 2 × 2 MIMO with two antennas on the transmission side (H polarization / V polarization) and two reception sides (H polarization / V polarization) for simplicity, the received H In order to separate the transmitted H-polarization and V-polarization information from the polarization / V-polarization signal, the receiving apparatus uses each of the transmission / reception antennas based on a known signal such as a pilot signal embedded in the signal. Estimate inter-channel characteristics. This propagation path characteristic can be mainly divided into “cross polarization characteristics of transmission antenna”, “propagation characteristics of propagation path”, and “cross polarization characteristics of reception antenna”.

FIG. 7 is a diagram illustrating a model for estimating a propagation path in a conventional receiving apparatus. A received signal in the MIMO transmission can be expressed by adding noise (N) to the transmission signals T _X1 and T _X2 obtained by performing a matrix operation on the propagation path characteristics H as shown in Equation (1). Note that H is a complex matrix, each element h _mn indicates the frequency response characteristic of the propagation path from the transmitting antenna m to the receiving antenna n, and each component of the orthogonal signal is Re (h _mn (k)) or Im It can be expressed in the form of (h _mn (k)). k is a carrier number of the OFDM signal, Re (h _mn (k)) represents a real number (real) or in-phase component of the carrier number k, and Im (h _mn (k)) is an imaginary number of the carrier number k. (Img) or orthogonal component.

JP 2004-321381 A

  In both the polarization MIMO communication system and the polarization MIMO transmission system described above, the accuracy of polarization separation in the receiver is an important factor that determines the transmission capacity of the system.

  The propagation path characteristics performed by the conventional receiver include “transmission antenna cross polarization characteristics”, “propagation path propagation characteristics”, and “reception antenna cross polarization characteristics” as shown in FIG. As described above, the conventional receiving apparatus estimates all these characteristics based on the pilot signal.

  That is, conventionally, a receiving apparatus that performs polarization MIMO has performed signal separation by estimating propagation path characteristics including cross polarization characteristics of transmission / reception antennas, and thus has a limit in signal separation accuracy.

  An object of the present invention has been made in view of the above-described problem, and is a transmission apparatus in a polarization MIMO transmission system using a polarization MIMO system that enables a plurality of signal separations accurately with respect to a reception apparatus. And providing a receiving apparatus.

A transmission apparatus according to the present invention is a polarization MIMO transmission system that uses a polarization MIMO (Multiple Input / Multiple Output) system that includes a transmission apparatus having a plurality of transmission antennas and a reception apparatus having a plurality of reception antennas. a transmission apparatus, a cross polarization characteristic information measured beforehand transmit antennas for each transmission system, have a means for transmitting to the receiving apparatus by using a predetermined C / N less data carrier a predetermined, wherein The cross polarization characteristic information of the transmission antenna is used in the reception apparatus for estimation of transmission path characteristics between the transmission antenna and the reception antenna .

  Further, in the transmission apparatus according to the present invention, when transmitting data signals of a plurality of transmission systems as OFDM subcarriers of each transmission system, a pilot signal is arranged in each OFDM subcarrier at a fixed period and a transmission control signal is transmitted. For each transmission system, and the OFDM frame configuration unit for each transmission system includes the cross-polarization characteristic information of the transmission antenna measured in advance for each transmission system. It is characterized by comprising means for multiplexing the transmission control signal as a data carrier with a small C / N and forming an OFDM frame.

  In the transmission apparatus according to the present invention, the OFDM frame configuration unit for each transmission system multiplexes cross-polarization characteristic information for each polarization of the transmission antenna measured in advance for each transmission system for each polarization on an AC signal. And means for forming an OFDM frame.

  Furthermore, the receiving apparatus according to the present invention is a polarization MIMO transmission that uses a polarization input MIMO (Multiple Input / Multiple Output) system composed of a transmitting apparatus having a plurality of transmitting antennas and a receiving apparatus having a plurality of receiving antennas. A receiving device in the system, which holds in advance the cross-polarization characteristic information of the polarization-specific reception antenna, and the cross-polarization characteristic information of the polarization-specific transmission antenna transmitted from the transmission device, Propagation path characteristics using means for extracting from a predetermined data carrier having a low required C / N, cross-polarization characteristic information of the receiving antenna, and cross-polarization characteristic information of the transmitting antenna for each polarization A plurality of transmissions using pilot signals transmitted from the transmitter according to the means for constructing a model and the propagation path characteristic model; And a means for estimating propagation path characteristics between the antenna and the plurality of receiving antennas, and a means for separating a data signal for each transmission system based on the estimated propagation path characteristics.

  In the receiving apparatus according to the present invention, the cross polarization characteristic information of the transmitting antenna for each polarization transmitted from the transmitting apparatus is extracted from the transmission control signal as a predetermined data carrier having a small required C / N. It has the means.

  The receiving apparatus according to the present invention further includes means for extracting cross-polarization characteristic information of a transmitting antenna for each polarization transmitted from the transmitting apparatus from the AC signal for each polarization.

  By adopting the polarization MIMO transmission system according to the present invention, it is possible to separate signals with higher accuracy in a receiving apparatus that receives polarization MIMO broadcasting.

It is a figure which shows the model which estimates the propagation path in the receiver which concerns on this invention. It is a block diagram of the transmitting apparatus of one Example by this invention. It is a block diagram of the receiver of one Example by this invention. It is a block diagram of a MIMO separation unit in the receiving apparatus of one embodiment according to the present invention. It is a figure which shows the structural example of a general MIMO transmission system. It is a figure which shows the structure of 2x2 MIMO in a general MIMO transmission system. It is a figure which shows the model which estimates the propagation path in the conventional receiver.

  Hereinafter, a transmitting apparatus and a receiving apparatus according to an embodiment of the present invention will be described.

  First, the transmission apparatus according to the present invention transmits information on cross polarization characteristics of a transmission antenna using a specific carrier in a transmission signal. By transmitting the cross polarization characteristics of the transmission antenna to the reception apparatus in advance using a carrier using a modulation scheme with a small required C / N, the reception apparatus can know the cross polarization characteristics of the transmission antenna.

FIG. 1 is a diagram showing a model for estimating a propagation path in a receiving apparatus according to the present invention. The received signal in the MIMO transmission can be expressed by adding noise (N) to the transmission signals T _X1 and T _X2 obtained by _performing a matrix operation on the propagation path characteristic H _PRO as shown in Equation (2).

As shown in FIG. 1, the propagation path characteristics are “transmission antenna cross polarization characteristics (H _TX )”, “propagation path characteristics (H _PRO )”, and “reception antenna cross polarization characteristics (H _RX )”. It is divided into three.

The “cross-polarization characteristic (H _TX ) of the transmission antenna” is a characteristic unique to the transmission antenna, and is a numerical value (complex matrix of the corresponding frequency range) measured in advance.

Since “cross-polarization characteristics (H _RX ) of the receiving antenna” is a characteristic unique to the receiving antenna, a numerical value (complex matrix of the corresponding frequency range) measured in advance is registered in the receiving apparatus.

In this way, if the “cross-polarization characteristics (H _TX ) of the transmission antenna” can be transmitted to the reception device prior to transmission of the main signal (data signal), the reception device can receive the “cross-polarization characteristic of the transmission antenna”. It is possible to estimate “propagation path characteristic (H _PRO )” more accurately by using “cross-polarization characteristic (H _RX ) of receiving antenna” registered as “wave characteristic (H _TX )”. Become.

  Hereinafter, a transmitting apparatus and a receiving apparatus according to an embodiment of the present invention will be described more specifically.

[Transmitter]
FIG. 2 is a block diagram of a transmission apparatus according to an embodiment of the present invention. For simplicity, the minimum number of antennas in the polarization MIMO transmission system is 2 × 2 of 2 antennas on the transmission side (H polarization and V polarization) and 2 antennas on the reception side (H polarization and V polarization). Although a polarization MIMO transmission system will be described, it should be noted that the present invention is not limited to this example.

  As shown in FIG. 2, the transmission apparatus 1 according to the present embodiment includes a horizontal polarization modulator 10a and a vertical polarization modulator 10b.

  The horizontal polarization modulation unit 10a includes an outer code unit 11a, a layer division unit 12a, inner code carrier modulation units 13a-1 to 13a-3, a layer synthesis unit 14a, a time interleave unit 15a, and a frequency interleave unit 16a. An OFDM frame configuration unit 17a, a pilot signal insertion unit 18a, a TMCC insertion unit 19a, an AC signal insertion unit 20a, a horizontally polarized wave transmission antenna propagation characteristic information setting unit 21a, an IFFT unit 22a, a guard interval An adding unit 23a and an orthogonal modulation unit 24a are provided.

  The vertical polarization modulation unit 10b includes an outer code unit 11b, a layer division unit 12b, inner code carrier modulation units 13b-1 to 13b-3, a layer synthesis unit 14b, a time interleave unit 15b, and a frequency interleave unit 16b. An OFDM frame configuration unit 17b, a pilot signal insertion unit 18b, a TMCC insertion unit 19b, an AC signal insertion unit 20b, a vertically polarized wave transmission antenna propagation characteristic information setting unit 21b, an IFFT unit 22b, a guard interval, An adding unit 23b and an orthogonal modulation unit 24b are provided.

  The internal configurations of the horizontal polarization modulation unit 10a and the vertical polarization modulation unit 10b are substantially the same except that the polarized waves to be processed are different from each other in the horizontal and vertical directions. The internal configuration will be described.

  The outer code unit 11a receives a TS data signal to be transmitted, and encodes, for example, a Reed-Solomon code. The data signal can be an energy-spread data signal. The layer dividing unit 12a divides the encoded data signal into a plurality of layer data. Each of the inner code carrier modulation units 13a-1 to 13a-3 performs carrier modulation on a plurality of hierarchical data.

  The layer combining unit 14a combines a plurality of layers of modulation signals to form a combined modulation signal. The time interleaving unit 15a performs time interleaving processing on the combined modulation signal. The frequency interleaving unit 16a performs frequency interleaving processing on the combined modulated signal subjected to time interleaving processing.

  The OFDM frame configuration unit 17a configures an OFDM frame from the combined modulation signal subjected to frequency interleaving processing. At this time, the OFDM frame configuration unit 17a arranges a pilot signal (SP: Scattered Pilot) signal at each fixed period in each OFDM subcarrier constituting the OFDM frame, and the data of the combined modulation signal, the AC signal ( Auxiliary carriers) and TMCC signals (Transmission and Multiplexing Configuration Control) are selectively allocated. The AC signal and the TMCC signal are collectively referred to as “transmission control signal”.

  The pilot signal insertion unit 18a inserts a pilot signal into the OFDM frame. The TMCC insertion unit 19a inserts a TMCC signal into the OFDM frame. The AC signal insertion unit 20a inserts an AC signal into the OFDM frame.

  The IFFT unit 22a receives the OFDM signal framed by the frame configuration unit 130, performs IFFT (inverse Fourier transform), and converts the frequency axis data into time axis data.

  The guard interval adding unit 23a receives the OFDM signal converted into time axis data by the IFFT unit 22a, and adds a guard interval (GI) signal to the OFDM signal.

  The quadrature modulation unit 24a receives the OFDM signal to which the GI signal is added by the guard interval signal addition unit 23a, and processes the OFDM signal that has been processed as a combination signal (complex number) of two real numbers and two imaginary numbers so far. Orthogonal modulation for orthogonalizing the signal and orthogonal signal is performed, and a horizontally polarized broadcast wave is transmitted by the transmitting antenna 101-1.

  The internal configuration of the horizontal polarization modulator 10a is the same as the internal configuration of the vertical polarization modulator 10b.

However, the horizontal polarization transmission antenna propagation characteristic information setting unit 21a includes the horizontal polarization transmission antenna cross polarization characteristic information (h _TX11 , H _TX11 , “transmission antenna cross polarization characteristic (H _TX )”). h _TX21 ), cross polarization characteristic information (h _TX12 , h _TX22 ) of the vertically polarized wave transmission antenna, or both are set in the free area of the AC signal.

The vertical polarized wave transmitting antenna transmission characteristic information setting section 21b of the "cross-polarization characteristics of the transmission antenna (H _TX)", cross polarization characteristic information of vertically polarized wave transmitting antenna (h _TX12, h _TX22 ) and / or the cross polarization characteristic information (h _TX11 , h _TX21 ) of the horizontally polarized wave transmission antenna or both are set in the free space of the AC signal.

The horizontally polarized wave transmission antenna propagation characteristic information setting unit 21a and the vertically polarized wave transmission antenna propagation characteristic information setting unit 21b are cross polarized wave characteristic information (h _TX11 , h _TX21 ) of the horizontally polarized wave transmission antenna or The cross polarization characteristic information (h _TX12 , h _TX22 ) of the transmission antenna for vertical polarization or both of them can be configured to be set in an empty area (reserved bit) of the TMCC signal. However, since the vacant area (reserved bit) of the TMCC signal is limited, considering that transmission is performed in a plurality of frames, multiplexing the cross-polarization characteristic information into the AC signal transmits with a smaller number of frames. There are advantages that are possible.

As described above, the transmission apparatus 1 according to the present embodiment transmits the “cross-polarization characteristics (H _TX ) of the transmission antenna” using the AC signal in the MIMO transmission.

  Next, a receiving apparatus according to an embodiment of the present invention will be described.

[Receiver]
FIG. 3 is a block diagram of a receiving apparatus according to an embodiment of the present invention. As shown in FIG. 3, the receiving apparatus 2 of the present embodiment includes a horizontal polarization demodulator 50a, a vertical polarization demodulator 50b, a horizontal polarization transmission antenna propagation characteristic information setting unit 57a, a vertical polarization Transmission antenna propagation characteristic information setting unit 57b, MIMO separation unit 58, reception antenna propagation path characteristic setting unit 59, time deinterleaving units 61a and 61b, frequency deinterleaving units 62a and 62b, and layer separation units 63a and 63b Carrier demodulation internal code decoding units 61a-1, 61a-2, 61a-3, carrier demodulation internal code decoding units 61b-1, 61b-2, 61b-3, layer synthesis units 65a, 65b, and outer codes Decoding units 66a and 66b are provided.

The horizontal polarization demodulation unit 50a includes an orthogonal demodulation unit 51a, a guard interval removal unit 52a, an FFT unit 53a, a frame separation unit 54a, a TMCC demodulation unit 55a, and an AC demodulation unit 56a. That is, in the horizontal polarization demodulator 50a, the quadrature demodulator 51a receives the received horizontal polarized broadcast wave, performs quadrature demodulation, separates it into an in-phase signal and a quadrature signal, and converts real and imaginary complex signals into At the same time, guard correlation is applied to detect the symbol timing which is the head of the symbol of the OFDM signal. The guard interval removing unit 52a removes the guard interval added according to the symbol timing to specify the effective symbol length, and the FFT unit 53a performs FFT processing to convert the time axis data into the frequency axis data, and the frame separating unit 54a separates a data signal, a pilot signal, etc. from the OFDM signal which comprises an OFDM frame, and extracts each signal. The TMCC demodulation unit 55a and the AC demodulation unit 56a demodulate and decode the TMCC signal and the AC signal, respectively, and extract the contents of the transmitted transmission control signal. The content of the transmission control signal to be extracted includes information such as a modulation method, a transmission mode, and a coding parameter as in the conventional case, but in the embodiment according to the present invention, the content is set to a free area of the AC signal. The propagation path characteristic information (h _TX11 , h _TX21 ) of the horizontal polarization transmission antenna and / or the cross polarization characteristic information (h _TX12 , h _TX22 ) of the vertical polarization transmission antenna are extracted.

The vertical polarization demodulator 50b includes an orthogonal demodulator 51b, a guard interval remover 52b, an FFT unit 53b, a frame separator 54b, a TMCC demodulator 55b, and an AC demodulator 56b. That is, in the vertical polarization demodulator 50b, the quadrature demodulator 51b receives the vertically polarized broadcast wave, performs quadrature demodulation, separates it into an in-phase signal and a quadrature signal, and converts real and imaginary complex signals into At the same time, guard correlation is applied to detect the symbol timing which is the head of the symbol of the OFDM signal. The guard interval removing unit 52b removes the guard interval added according to the symbol timing to specify the effective symbol length, and the FFT unit 53b performs FFT processing to convert the time axis data into the frequency axis data, and the frame separating unit 54b separates a data signal, a pilot signal, etc. from the OFDM signal which comprises an OFDM frame, and extracts each signal. The TMCC demodulator 55b and the AC demodulator 56b demodulate and decode the TMCC signal and the AC signal, respectively, and extract the contents of the transmitted transmission control signal. The content of the transmission control signal to be extracted includes information such as a modulation scheme, a transmission mode, and an encoding parameter as in the conventional case. In the embodiment according to the present invention, the transmission for vertical polarization is performed from the AC signal. Antenna propagation path characteristic information (h _TX12 , h _TX22 ), horizontal polarization transmission antenna cross polarization characteristic information (h _TX11 , h _TX21 ) or both are extracted.

The horizontal polarization transmission antenna propagation characteristic information setting unit 57a sets the cross polarization characteristic information (h _TX11 , h _TX21 ) of the horizontal polarization transmission antenna extracted from the AC signal in the MIMO separation unit 58.

The vertical polarization transmission antenna propagation characteristic information setting unit 57b sets the cross polarization characteristic information (h _TX12 , h _TX22 ) of the vertical polarization transmission antenna extracted from the AC signal in the MIMO separation unit 58.

The MIMO separation unit 58 and the cross-polarization characteristic information of the horizontal polarization transmission antenna obtained from the horizontal polarization transmission antenna propagation characteristic information setting unit 57a (the pilot signal separated by the frame separation units 54a and 54b, respectively) h _TX11 , h _TX21 ), vertical polarization transmission antenna cross polarization characteristic information (h _TX12 , h _TX22 ) obtained from the vertical polarization transmission antenna propagation characteristic information setting unit 57 b, and reception antenna propagation path characteristics Information on the “cross-polarization characteristics (H _RX ) of the receiving antenna” obtained from the setting unit 59 is input, and each transmission is performed on the data signal obtained from the horizontal polarization demodulator 50a and the vertical polarization demodulator 50b. The orthogonal codes assigned to the system are multiplied by one bit at a time in symbol units, and all the propagation path characteristics between the transmitting antenna 101 and the receiving antenna 201 ( 1), and the input data signal is separated into data signals corresponding to each transmission system using the propagation path estimation result. Details of the operation of the MIMO separation unit 58 will be described later.

Since the reception antenna propagation path characteristic setting unit 59 is a characteristic unique to the reception antenna, a “measured value of crossing bias of the reception antenna” in which a numerical value (complex matrix of the corresponding frequency range) measured in advance is registered in the reception apparatus 2 is used. Information of “wave characteristic (H _RX )” is set in the MIMO separation unit 58.

  The time deinterleaving units 61a and 61b receive the data signals corresponding to the transmission systems respectively separated by the MIMO demultiplexing unit 58 and perform time deinterleaving processing. The frequency deinterleaving units 62a and 62b perform frequency deinterleaving processing. The layer separation units 63a and 63b perform layer separation corresponding to the transmission-side layer synthesis units 14a and 14b, respectively, and the carrier demodulation intra-code demodulation units 61a-1, 61a-2, 61a-3 and the carrier demodulation The code decoding units 61b-1, 61b-2, 61b-3 are modulation schemes corresponding to the inner code carrier modulation units 13a-1 to 13a-3 and the inner code carrier modulation units 13b-1 to 13b-3 on the transmission side, respectively. And a decoding process using an encoding method, and layer synthesis is performed by the layer synthesis units 65a and 65b, respectively. The No. decoding unit 66a, 66b, the outer code portion 11a of each sender, performs decoding processing by the encoding method corresponding to 11b, and outputs the TS of a corresponding data signal to each transmission system.

FIG. 4 is a block diagram of a MIMO separation unit in the receiving apparatus according to an embodiment of the present invention. The MIMO separation unit 58 includes a propagation path estimation unit 581 and a data signal separation unit 582. The propagation path estimation unit 581 is configured to transmit the pilot signal separated by the frame separation units 54a and 54b and the transmission antenna propagation characteristic for horizontal polarization. Cross polarization characteristics information (h _TX11 , h _TX21 ) of the horizontally polarized wave transmission antenna obtained from the information setting unit 57a, and a vertically polarized wave transmission antenna obtained from the vertical polarization transmission antenna propagation characteristic information setting unit 57b Cross polarization characteristics information (h _TX12 , h _TX22 ) and information on “cross polarization characteristics (H _RX ) of the reception antenna” obtained from the reception antenna propagation path characteristic setting unit 59 are input. After constructing the transfer function of (2), “propagation path characteristics (H _PRO )” is estimated. The “propagation path characteristic (H _PRO )” is estimated using a pilot signal, which is a known signal, as in the conventional estimation method. In other words, in the conventional cross polarization characteristic information of the transmitting horizontally polarized antenna _{(h TX11,} h _TX21) and cross-polarization characteristic information of the transmission antennas for vertically polarized waves _{(h TX12,} h _TX22) uncertainties However, according to the present invention, the uncertain factor can be reduced, so that the accuracy of the estimated propagation path characteristics is improved, the accuracy of signal separation is improved, and the processing speed is reduced. It will be possible to improve.

  The data signal separation unit 582 separates the input data signal into data signals corresponding to each transmission system using the propagation path characteristics estimated by the propagation path estimation unit 581.

  As described above, according to the present invention, the transmission apparatus 1 includes a plurality of transmission antennas 101 (# 1 to #N) and the reception apparatus 2 includes a plurality of reception antennas 201 (# 1 to #N). In the polarization MIMO transmission system using the polarized MIMO (Multiple Input / Multiple Output) method, the transmission device 1 uses the predetermined cross-polarization characteristic information of the transmission antenna determined in advance for each transmission system. Means for transmitting using a data carrier with low C / N. More specifically, when transmitting a data signal of a plurality of transmission systems as an OFDM subcarrier of each transmission system, the transmission apparatus 1 arranges and transmits a pilot signal in each OFDM subcarrier at a constant period. An OFDM frame configuration unit 17a, 17b for each transmission system, which configures an OFDM frame by assigning a control signal, is provided. The OFDM frame configuration unit 17a, 17b for each transmission system is an intersection of transmission antennas 101 predetermined for each transmission system. Means for multiplexing the polarization characteristic information with the transmission control signal to form an OFDM frame. In particular, the OFDM frame configuration units 17a and 17b for each transmission system configure an OFDM frame by multiplexing cross polarization characteristics information for each polarization of the transmission antenna predetermined for each transmission system for each polarization on an AC signal. It is preferable to do this.

  In addition, according to the present invention, the bias is configured by the transmission apparatus 1 having a plurality of transmission antennas 101 (# 1 to #N) and the reception apparatus 2 having a plurality of reception antennas 201 (# 1 to #N). In a polarization MIMO transmission system using a wave MIMO (Multiple Input / Multiple Output) method, the reception device 2 uses the reception antenna propagation path characteristic setting unit 59 to obtain cross polarization characteristic information of reception antennas for each polarization in advance. The cross-polarization characteristic information of the transmission antenna for each polarization transmitted from the transmission apparatus 1 is demodulated and extracted from a predetermined data carrier having a small required C / N, and the reception antenna A propagation path characteristic model is constructed using the cross-polarization characteristic information of 201 and the cross-polarization characteristic information of the transmitting antenna for each polarization, and the propagation path characteristic model is used. Then, the propagation path characteristics between the plurality of transmission antennas 101 and the plurality of reception antennas 201 are estimated using the pilot signal transmitted from the transmission apparatus, and the data signal for each transmission system is separated based on the estimated propagation path characteristics. A MIMO separation unit 58 is provided.

  In particular, the receiving device 2 extracts the cross-polarization characteristic information of the transmitting antenna for each polarization transmitted from the transmitting device 1 from the transmission control signal as a predetermined data carrier having a small required C / N. Preferably, the AC signal is extracted for each polarization. As a result, the receiving device 2 can immediately acquire the cross polarization characteristic information of the transmission antenna for each polarization at a high C / N, and a plurality of signals can be separated more accurately than in the past.

  According to the present invention, since MIMO signal separation can be performed with high accuracy, the present invention is useful for a polarization MIMO transmission system using a polarization MIMO scheme.

DESCRIPTION OF SYMBOLS 1 Transmitter 10a Horizontal polarization modulation part 10b Vertical polarization modulation part 11a, 11b Outer code | symbol part 12a, 12b Hierarchical division part 13a-1-13a-3, 13b-1-13b-3 Inner code | carrier modulation | alteration part 14a, 14b Layer synthesizing unit 15a, 15b Time interleaving unit 16a, 16b Frequency interleaving unit 17a, 17b OFDM frame configuration unit 18a, 18b Pilot signal inserting unit 19a, 19b TMCC inserting unit 20a, 20b AC signal inserting unit 21a Horizontal polarization transmission antenna propagation Characteristic information setting unit 21b Vertical polarization transmitting antenna propagation characteristic information setting unit 22a, 22b IFFT unit 23a, 22b Guard interval adding unit 24a, 24b Orthogonal modulation unit 50a Horizontal polarization demodulation unit 50b Vertical polarization demodulation unit 57a Horizontal polarization Transmission antenna propagation characteristics Setting unit 57b Vertical polarization transmission antenna propagation characteristic information setting unit 58 MIMO separation unit 59 Reception antenna propagation path characteristic setting unit 61a, 61b Time deinterleaving unit 62a, 62b Frequency deinterleaving unit 63a, 63b Hierarchical separation unit 61a-1, 61a-2, 61a-3 Intra-carrier demodulation code decoding unit 61b-1, 61b-2, 61b-3 In-carrier demodulation code decoding unit 65a, 65b Hierarchical synthesis unit 66a, 66b Outer code decoding unit 100 Transmitting device 101, 101- 1, 101-2 transmitting antenna 200 receiving apparatus 201 receiving antenna 581 propagation path estimating unit 582 data signal separating unit

Claims (6)

A transmission apparatus in a polarization MIMO transmission system that uses a polarization MIMO (Multiple Input / Multiple Output) system configured of a transmission apparatus having a plurality of transmission antennas and a reception apparatus having a plurality of reception antennas,
The cross polarization characteristic information measured beforehand transmit antennas for each transmission system, have a means for transmitting to the receiving apparatus by using a predetermined C / N less data carrier a predetermined,
The transmitting apparatus, wherein the cross-polarization characteristic information of the transmitting antenna is used for estimating a propagation path characteristic between the transmitting antenna and the receiving antenna in the receiving apparatus. When transmitting data signals of a plurality of transmission systems as OFDM subcarriers of each transmission system, each OFDM subcarrier is arranged with a pilot signal at a fixed period, and a transmission control signal is allocated to configure an OFDM frame. With an OFDM frame configuration unit for each transmission system,
The OFDM frame configuration unit for each transmission system configures an OFDM frame by multiplexing the cross polarization characteristic information of the transmission antenna measured in advance for each transmission system on the transmission control signal as the data carrier having a small required C / N. The transmission apparatus according to claim 1, further comprising: means.   The OFDM frame configuration unit for each transmission system has means for multiplexing the cross-polarization characteristic information for each polarization of the transmission antenna measured in advance for each transmission system for each polarization to form an OFDM frame by multiplexing the AC signal. The transmission apparatus according to claim 2, wherein A receiving apparatus in a polarization MIMO transmission system using a polarization input MIMO (Multiple Input / Multiple Output) system composed of a transmitting apparatus having a plurality of transmitting antennas and a receiving apparatus having a plurality of receiving antennas,
Means for preliminarily storing cross polarization characteristics information of the receiving antenna for each polarization;
Means for extracting cross-polarization characteristic information of a transmission antenna for each polarization transmitted from the transmission device from a predetermined data carrier having a small required C / N;
Means for constructing a propagation path characteristic model using the cross-polarization characteristic information of the reception antenna and the cross-polarization characteristic information of the transmission antenna for each polarization;
Means for estimating propagation path characteristics between the plurality of transmission antennas and the plurality of reception antennas using a pilot signal transmitted from the transmission device according to the propagation path characteristic model;
Means for separating data signals for each transmission system based on the estimated propagation path characteristics;
A receiving apparatus comprising:   Characterized in that it has means for extracting the cross-polarization characteristic information of the transmission antenna for each polarization transmitted from the transmission device from the transmission control signal as a predetermined data carrier with a small required C / N, The receiving device according to claim 4.   6. The receiving apparatus according to claim 5, further comprising means for extracting cross-polarization characteristic information of a transmitting antenna for each polarization transmitted from the transmitting apparatus for each polarization from an AC signal.

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