RU2786185C1 - Transmission/reception method and transmission/reception system - Google Patents

Abstract

FIELD: communication technology.

SUBSTANCE: invention relates to communication technology and can be used in wireless communication systems with multiple MIMO transmitting antennas. The characteristics of the set of propagation pseudo-channels are characteristics similar to frequency characteristics that can be approximated by the characteristics of the set of real propagation channels; at the transmission stage, one or more data is created by reflecting the characteristics of a plurality of propagation pseudo-channels in a plurality of parallel and independent data and one or more data are transmitted from a plurality of transmitting antennas in the form of radio waves; and at the reception stage, a plurality of parallel and independent data are extracted from one or more received data in the form of radio waves by the receiving antenna, based on the characteristics of the plurality propagation pseudo-channels.

EFFECT: increase in the efficiency of resource use.

14 cl, 23 dwg

Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[0001]

The present invention relates to communication technology using electromagnetic waves, such as mobile communication, wireless communication and optical communication. More specifically, the present invention relates to a data transmission/reception technique and a multiplexing method using resources such as a frequency.

BACKGROUND OF THE INVENTION

[0002]

Existing communication systems are required to improve resource efficiency such as frequency. Time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), and the like are used as multiplexing methods in existing communication systems. OFDMA is a method in which, by providing frequency and time division blocks, i.e. of resource blocks in the subcarrier group generated by the OFDM method (OFDM: Orthogonal Wave Frequency Division Multiplexing Modulation), the plurality of subscribers are assigned according to frequency selective fading for a specific user. At the same time, many users can access them at the same time.

[0003]

Further, as existing technology related to fifth generation mobile communication and the like, MIMO (multiple input multiple output), beamforming and the like are used. MIMO is a technology in which, in wireless communication, multi-input, multi-output information transmission is performed by exploiting differences in propagation channel characteristics in a plurality of radio propagation channels between a plurality of transmitting station antennas and a plurality of receiving station antennas. Beamforming is a technology for increasing the directivity of electromagnetic waves in a predetermined direction, and phased array antennas and the like are used as appropriate antenna technologies. Traditional beamforming has been a parabolic antenna or a multi-antenna in hardware, but in recent years, it has become possible to perform amplitude control and phase control for each antenna element by using MIMO through software.

[0004]

For example, Non-Patent Documents 1 and 2 disclose the core technology of a MIMO system for fourth generation mobile communications. Non-Patent Document 3 discloses a multi-antenna wireless transmission technology. Non-Patent Document 4 discloses the basic technology of the beam forming method.

KNOWN DOCUMENTS

patent document

[0005]

Patent Document 1: Japanese Patent No. 6497472

Non-Patent Documents

[0006]

Non-Patent Document 1: 3GPP Technical Specification; 3GPP TS 36.101V8.5.0 (2009-03) , 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-ULTRA); User Equipment (UE) radio transmission and reception (Release 8), March 2009. (3GPP Technical Specification; 3GPP TS 36.101V8.5.0 (2009-03), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Enhanced Universal Terrestrial Radio Access ( E-ULTRA); User Equipment (UE) Radio Transmission and Reception (Issue 8), March 2009)

Non-Patent Document 2: 3GPP Technical Specification; 3GPP TS 36.211V8.5.0 (2008-12), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-ULTRA); Physical channels and modulation (Release 8), December 2008 (3GPP Technical Specification; 3GPP TS 36.211V8.5.0 (2008-12), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Enhanced Universal Terrestrial Radio Access (E-ULTRA); Physical channels and modulation (Issue 8), December 2008)

Non-Patent Document 3: Higuchi and Taoka, “multiantenna wireless transmission technology”, NTT DoCoMo technical journal, Vol. 14, no. 1 (April, 2006). (“Higuchi and Taoka,” “multiantenna wireless transmission technology,” NTT DoCoMo Technical Journal, Vol. 14, No. 1 (April 2006)).

Non-Patent Document 4: 3GPP Technical Report; 3GPP TR 36.873 V12.7.0 (2017-12), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on 3D channel model for LTE (December, 2017) “Investigation of a three-dimensional channel model for LTE”) (December 2017)).

SUMMARY OF THE INVENTION

Problems solved by the invention

[0007]

The transmission/reception method and its system, such as conventional MIMO or conventional beamforming, have the ability to improve the efficiency of using resources such as frequency. It is an object of the present invention to provide a technology capable of realizing resource efficiency improvement such as frequency with respect to MIMO, beamforming, and the like.

Troubleshooting Tools

[0008]

An exemplary embodiment of the present invention has the following configuration. The transmission/reception method according to one embodiment is a method for transmitting and receiving data between a transmission device with a plurality of transmission antennas and a reception device with a reception antenna. The transmission/reception method includes: a generating step, in which characteristics of a plurality of propagation pseudo-channels are generated using a transmission device or a reception device (based on the characteristics of a plurality of real propagation channels between a plurality of transmitting antennas and a receiving antenna. Moreover, the characteristics of the plurality of pseudo-propagation channels are characteristics, similar to frequency responses, to the extent that the frequency response can be approximated from the characteristics of a plurality of actual propagation channels; a transmission step in which one or more data to be transmitted is created by a transmission device by reflecting the characteristics of a plurality of pseudo propagation channels in a plurality of parallel and of independent data and transmitting one or more data from a plurality of transmitting antennas in the form of radio waves; and a reception step in which a plurality of parallel and independent yes data from one or more received data received as radio waves by the receiving antenna, based on the characteristics of the plurality of pseudo propagation channels. In this case, the transmission device has a MIMO transmission function. The receiving apparatus includes a plurality of receiving antennas as a receiving antenna and has a MIMO receiving function. The generation step is the step of generating, by a transmitter or a receiver, characteristics of a plurality of pseudo propagation channels based on characteristics of a plurality of actual propagation channels including diagonal propagation channels between a plurality of transmission antennas and a plurality of reception antennas. The diagonal line propagation channels are propagation channels, other than propagation channels, each of which faces directly one another between a plurality of transmit antennas and a plurality of receive antennas. The transmission step is a step in which the transmission apparatus generates a plurality of parallel and independent data to be transmitted by reflecting the characteristics of the plurality of pseudo propagation channels in the plurality of data, and transmits the plurality of parallel and independent data from the transmission antenna group as radio waves by using the MIMO transmission function. . The receiving step is a step in which the receiver generates a received data set from signals received as radio waves by a plurality of reception antennas by using a MIMO reception function, and extracts a data set based on characteristics of a plurality of pseudo propagation channels from the received data set.

Technical results of the invention

[0009]

According to an exemplary embodiment of the present invention, resource efficiency improvements such as frequency can be realized with respect to MIMO or beamforming.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]

Fig. 1 is a view showing the configuration of the transmission/reception method and its system according to the first embodiment of the present invention.

Fig. 2 is a view showing a detailed configuration example of the key parts of the transmission/reception method and its system according to the first embodiment.

Fig. 3 is a view illustrating a method for measuring characteristics of actual distribution channels according to the first embodiment;

Fig. 4 is a view illustrating a method for generating pseudo propagation channel characteristics according to the first embodiment.

Fig. 5 is a view illustrating a method for reducing cross-correlation of diagonal link propagation channels in MIMO according to the first embodiment.

Fig. 6 is a view illustrating a comparison of spreading-related cross-correlation capabilities using characteristics of pseudo propagation channels according to the first embodiment.

Fig. 7 is a view illustrating a configuration example of a MIMO system as a transmission/reception method and its system according to the second embodiment of the present invention;

Fig. 8 is a view illustrating an example of frequency selective fading simulation according to the second embodiment.

Fig. 9 is a view illustrating the effect of eliminating frequency selective fading according to the second embodiment.

Fig. 10 is a view illustrating signal conversion to reduce frequency selective fading according to the second embodiment.

Fig. 11 is a view illustrating a configuration example of a beamforming system as a transmission/reception method and a system thereof according to a third embodiment of the present invention.

Fig. 12 is a view illustrating a use case according to the third embodiment.

Fig. 13 is a view illustrating part 1 of a method for generating a plurality of pseudo-delay profile models according to the third embodiment.

Fig. 14 is a view illustrating part 2 of a method for generating a plurality of pseudo-delay profile models according to the third embodiment.

Fig. 15 is a view illustrating part 3 of a method for generating a plurality of pseudo-delay profile models according to the third embodiment.

Fig. 16 is a view illustrating an OFDM frame and a CP configuration according to the third embodiment.

Fig. 17 is a view illustrating a configuration example of a beamforming system in the form of a transmission/reception method and a system thereof according to a fourth embodiment of the present invention;

Fig. 18 is a view illustrating a use case according to the fourth embodiment.

Fig. 19 is a view showing the configuration of a modification example according to the third and fourth embodiments.

Fig. 20 is a view illustrating a configuration example of a pseudo distribution channel FIR filter as an addition to the embodiments.

Fig. 21 is a view illustrating the configuration of a transmission/reception method and its system in MIMO of a known example.

Fig. 22 is a view illustrating the configuration of a transmission/reception method and its system in beamforming a known example.

Fig. 23 is a view illustrating a detailed configuration example in MIMO of a known example.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that throughout the drawings, in principle, the same reference numeral is assigned to the same component, and a repeated explanation thereof will be omitted.

[0012]

[Problems, etc.] (one)]

Problems, etc. will be described further. As the main technology that supports fifth generation mobile communication acceleration, we can mention MIMO technology, which appeared in the second half of the third generation.

[0013]

In FIG. 21 illustrates the configuration of the basic MIMO communication functions. In FIG. 21 illustrates an example of 4×4 MIMO. The system illustrated in FIG. 21 includes a transmission station X1 such as a wireless base station and a reception station X2 such as a user terminal, and transmits and receives data from the transmission station X1 to the reception station X2 using MIMO. The four input data on the side of the transmitting station X1 are the data D1, D2, D3 and D4. At the transmitting station X1, four input data are transmitted from the four antenna elements of the X3 antenna, which is an antenna for 4×4 MIMO communication, to the receiving station X2 as four X4 radio waves after MIMO modulation. The four radio waves X4 respectively have characteristics h11, h22, h33, and h44 as propagation channel characteristics X5. The four radio waves X4 respectively propagate along the propagation channels of the X5 characteristics and reach the receiving station X2, which is the subscriber's user terminal. The receiving station X2 performs MIMO reception for the four radio waves X4 through the antenna X6, which is an antenna for 4×4 MIMO communication. The four outputs of the respective propagation channels are data D1b, D2b, D3b and D4b. The receiving station X2 analyzes and extracts these four data from the received signals. This data contains some noise components, but is equivalent to four input data sent by the transmitting side. Thus, a 4×4 MIMO system can transmit four data on the same frequency band. Namely, a 4×4 MIMO system can achieve a transmission rate four times faster than a SISO system that has a single transmit/receive antenna.

[0014]

However, as illustrated at the bottom of FIG. 21, the 16 propagation channels obtained by "4×4=16" essentially exist between four transmit antennas and four receive antennas. The characteristics of the 16 propagation channels have a correlation with each other, in other words, have a high cross-correlation, that is, the independence is low. For this reason, diagonal link propagation channels are not used in an actual MIMO system. Diagonal distribution channels are distribution channels other than distribution channels that face each other directly according to each of the data. For example, assuming that the propagation path from antenna A1 to antenna B1 is a propagation path that is a path directly to another propagation path, the propagation path from antenna A1 to antenna B2, and the like. represents a propagation channel along a diagonal line.

[0015]

On the other hand, fifth generation mobile communication also uses the MIMO system, but a new feature is added to its use, which is called beamforming.

[0016]

[Problems, etc.] (2)]

On FIG. 22 illustrates a diagram of a MIMO system using beamforming, in other words, a beamforming system. In FIG. 22 illustrates an example of a communication scheme using a beamforming function in a 4 × N MIMO system. Here, the number symbol N indicates the number of receiving stations on the receiving side, and N ≥ 1. In the present embodiment, N is 4. In FIG. 22, the plurality of subscribers denotes subscribers YU1 to YU4. Receiving stations, which are user terminals respectively belonging to subscribers, are designated as receiving stations Y21-Y24. As data to be transmitted from the side of the transmission station Y1, data D1 to D4 are presented. In the example in FIG. 22 illustrates a case where data D1 is transmitted to user YU1, data D2 is transmitted to user YU2, data D3 is transmitted to user YU3, and data D4 is transmitted to user YU4.

[0017]

At the transmitting station Y1, the data signal D1 is applied to all of the plurality of antennas A1-A4 in antenna Y3, which is a MIMO antenna. At this time, the signal is subjected to amplitude and phase delay for each antenna and fed to it. The feed signals for the respective users who have been subjected to this amplitude and phase delay denote feed signals Y41, Y42, Y43 and Y44. The radio waves that are transmitted from the respective antennas based on these feed signals and reach the receiving stations of the respective subscribers are designated radio waves Y51, Y52, Y53 and Y54. The radio wave group Y50 includes these radio waves. At this time, the radio wave for each subscriber becomes a beam that passes to a different place for each receiving station of the corresponding subscriber. The beam to each receiving station is considered such that the received power at other receiving stations becomes low. This allows each receiving station to receive the radio wave transmitted to it with high quality while still sharing the same frequency band. Each receiving station decodes the transmitted signal carried by the corresponding radio wave and extracts the data that represents the received signal. The retrieved data refers to D1c, D2c, D3c and D4c data. Thus, the terminals of the four subscribers can receive data transmitted separately.

[0018]

However, the MIMO system illustrated in FIG. 21 can receive data four times faster than SISO. On the other hand, in the beamforming system illustrated in FIG. 22, instead of being able to respectively transmit data to four subscribers, it is inevitable that the data to be supplied to the four transmitting antennas is the same data and only one times larger than the data received by each subscriber. This is because the amplitude and phase of each of the radio waves emitted from the four transmission antennas are controlled for each subscriber to form one beam of radio waves. For this reason, in the fifth generation mobile communication, the means for increasing the number of multiple modulation values is adopted as the means for increasing the communication speed, while the number of beams in the beamforming function is set to one. This means that a high error rate mode such as 64-QAM or 256-QAM is used, while the number of multiple modulation values up to the fourth generation was 16-QAM (QAM: Quadrature Amplitude Modulation).

[0019]

[Problems, etc.] (3)]

In FIG. 23 illustrates the configuration of the device interior and distribution channels in the MIMO system corresponding to the MIMO illustrated in FIG. 21. The transmitting station X1 is a transmission device such as a wireless base station, and the receiving station X2 is a reception device such as a user terminal. In the present embodiment, the transmission antenna assembly X50 of the transmission station X1 is a transmission-side MIMO antenna assembly, and includes the transmission antennas X51, X52, X53, and X54 as separate MIMO antennas, which are a plurality of transmission antennas. Further, in the present embodiment, the reception antenna assembly X60 of the reception station X2 is a reception side MIMO antenna assembly, and includes the reception antennas X61, X62, X63, and X64 as separate MIMO antennas, which are a plurality of reception antennas.

[0020]

The transmission station X1 includes a transmission data processing portion X30, a transmission side MIMO processing portion X40, a transmission antenna portion X50, a MIMO control portion X55, and the like. The receiving station X2 includes a receiving antenna part X60, a receiving side MIMO processing part X70, an error correction part X80, a parallel-to-serial converter X86, a code decoder X88, a propagation channel performance estimation part X89, and the like. Note that in Fig. 21 and FIG. 23 illustrates the case of downlink transmission/reception from a transmitting station to a receiving station. In the case of an uplink, it can be considered that the positions of the transmitting station and the receiving station can be swapped.

[0021]

On the downlink, the transmission station X1 encodes the data X31 for transmission by the transmission processing node X30. The transmission data processing unit X30 has the function of an encoder and a multiplexer. The encoded data is distributed in the transmitting side MIMO processing node X40 provided in the next step. In the present embodiment, they are distributed as four data XD1, XD2, XD3 and XD4. The transmission data signals from the individual MIMO processing nodes X41, X42, X43 and X44 of the transmission side MIMO processing node X40 are respectively transmitted from the transmission antennas X51 to X54 of the transmission side MIMO antenna node X50 into free space as radio waves.

[0022]

At the receiving side MIMO antenna node X60 of the receiving station X2, the radio waves from the transmitting antennas X51 to X54 are respectively received by the receiving antennas X61 to X64. Then, the receiving side MIMO processing node X70 extracts the radio wave information in each of the individual MIMO processing nodes X71, X72, X73, and X74. For example, a separate MIMO processing node X71 extracts radio wave information from the transmit antenna X51 based on the propagation channel characteristic h11. A separate MIMO processing node X72 extracts radio wave information from the transmitting antenna X52 based on the propagation channel characteristic h22. The separate MIMO processing node X73 extracts the radio wave information from the transmitting antenna X53 based on the propagation channel characteristic h33. A separate MIMO processing node X74 extracts radio wave information from the transmitting antenna X54 based on the propagation channel characteristic h44. The respective outputs of the receiving side MIMO processing node X70 are supplied to the error correction node X80 as outputs X81, X82, X83, and X84 to check and obtain more correct information. The output X85 of the error correction node X80 becomes the original data X87 of the time series using the parallel-to-serial converter X86. The time series data X87 becomes the received data X90, which is the data corresponding to the data X31 at the transmission side, by the code decoder X88.

[0023]

In the example illustrated in FIG. 23, 16 propagation channels including diagonal line propagation channels in 4×4 MIMO are illustrated as a real propagation channel X100. The four propagation paths of mutually facing pairs in the actual propagation path X100 denote propagation paths P11, P22, P33, and P44, and the respective characteristics are characteristics h11, h22, h33, and h44, respectively. These characteristics can be recognized by the distribution channel characteristics estimation node X89 based on the received signals. The recognized characteristics of the propagation channels are supplied to the receiving side MIMO processing node X70 and the error correction node X80. As a result, this MIMO system can achieve a transmission rate several times higher than that of a SISO system according to the number of radio propagation channels of the transmit/receive antenna pair, which are four in the present embodiment.

[0024]

[Problems, etc.] (4)]

As illustrated in FIG. 21 and FIG. 23, the conventional MIMO system uses propagation channels in which a pair of transmit/receive antennas face each other between a transmitter and a receiver. In fact, as illustrated in FIG. 21 and FIG. 23, there are a large number of propagation channels on the diagonal lines. For example, from the perspective of the first transmission antenna X51, on the transmission side, there is a propagation path P21 to the second reception antenna X62, a propagation path P31 to the third reception antenna X63, and a propagation path P41 to the fourth reception antenna X64. Further, in the first reception antenna X61, on the reception side, there are a propagation path P12 from the second transmission antenna X52, a propagation path P13 from the third transmission antenna X53, and a propagation path P14 from the fourth transmission antenna X54. The same applies to other distribution channels.

[0025]

The reason such diagonal link propagation channels are not used in a conventional MIMO system is that each propagation channel cannot be accessed independently due to the cross-correlation of characteristics between the propagation channels. Accordingly, the transmission/reception method according to the first embodiment utilizes the characteristics of pseudo propagation channels such that the cross-correlation between propagation channels including such diagonal propagation channels becomes low. For example, in the case where there are 16 propagation channels in 4×4 MIMO as described above, and the cross-correlation between the characteristics of any two propagation channels is low enough, 16 types of data can be transmitted in parallel at the same time. In the first embodiment, pseudo propagation channel characteristics are generated to implement multiple transmissions on such a plurality of propagation channels including diagonal propagation channels between a plurality of transmit antennas and a plurality of receive antennas.

[0026]

The present invention proposes a new transmission/reception method during communication using MIMO or beamforming with respect to fifth generation mobile communication. As a technology related to the present invention, the transmission/reception method of Japanese Patent Application No. 2018-118353 (Corresponding Japanese Patent No. 6497472) of the present inventor is presented. This technique is a technique in which a transmission device generates a pseudo propagation channel response based on a propagation channel response; the pseudo propagation channel characteristic is superimposed and synthesized on the data set; and radio waves corresponding to the transmitted signal thus generated are transmitted from the antenna. According to this technology, it is possible to solve the problem that the number of antennas in the MIMO system increases due to the increase in the communication speed in the OFDM system by one antenna.

[0027]

The present invention has been made by applying the invention disclosed in Japanese Patent Application No. 2018-118353 to solve the main problem of the existing MIMO method and the problem of beamforming, which is the main function of fifth generation mobile communication. The present invention addresses the limitation of MIMO in which its usage environment is limited. In addition, the present invention realizes a communication capacity comparable to the total number of branches n×m (n and m are plural, but n ≥ m) in the n×m MIMO of the original MIMO. The present invention solves the performance problems with multiple antennas in a MIMO system having multiple antennas while maintaining performance.

[0028]

(First embodiment)

The transmission/reception method and its system according to the first embodiment of the present invention will be described with reference to FIG. 1-fig. 6. The transmission/reception system according to the first embodiment is an example of a system that implements the transmission/reception method according to the first embodiment.

[0029]

[Review]

The transmission/reception method according to the first embodiment is a transmission/reception method in which MIMO communication is performed between a transmission device providing a plurality (N) of transmission antennas and having a MIMO transmission function, and a reception device providing a plurality of (M, N ≥ M) receiving antennas and having the function of receiving MIMO. This transmission/reception method includes: a measurement step in which the characteristics of a plurality (N×M) of actual propagation channels between a plurality (N) of transmission antennas and a plurality (M) of reception antennas are measured by a transmission device or a reception device; a generating step of generating, by the transmitting device or the receiving device, a plurality (N×M) of pseudo propagation channel characteristics, which are characteristics similar to the frequency characteristics, to the extent that the frequency characteristic can be approximated, based on the characteristics of the set (N × M) real distribution channels; a transmission step in which a plurality (N) of transmission signals obtained by reflecting the characteristics of a plurality (N × M) of pseudo propagation channels in a plurality (L) of parallel and independent data are created by the transmission device, and a plurality (N) of transmission signals is transmitted from the plurality ( N) transmitting antennas in the form of radio waves; and a receiving step of extracting, by means of the receiving apparatus, a plurality (L) of parallel and independent data based on characteristics of a plurality (maximum N × M) of pseudo propagation channels from a plurality (M) of received signals received as radio waves by a plurality (M) of reception antennas.

[0030]

The transmission/reception system according to the first embodiment performs the transmission/reception function using characteristics of pseudo propagation channels in each base band node of the transmission device and the reception device. In the step of measuring the transmission/reception method according to the first embodiment, the transmission device or the reception device measures the characteristics of the propagation channels (also called "real propagation channels") between the transmission/reception antennas. Note that an existing mechanism may be used and thus this measurement may be omitted. In the generation step in the transmission/reception method according to the first embodiment, the transmission device or the reception device generates a plurality of pseudo propagation channel characteristics similar to those of real propagation channels obtained by measurement. The pseudo propagation channel feature set has a lower cross-correlation than the cross-correlation of the real propagation channel feature set. In the transmission step of the transmission/reception method according to the first embodiment, the transmission device creates a plurality of groups of parallel and independent transmission data for transmission of target data in a base band node by using a plurality of pseudo propagation channel characteristics and transmits them from a plurality of transmission antennas. In the receiving step in the transmission/reception method according to the first embodiment, the receiving apparatus extracts a plurality of constellations of parallel and independent transmission data from the constellations of signals received by the reception antennas at the base band node by using a plurality of characteristics of pseudo propagation channels. The information about the set of characteristics of the pseudo distribution channels to be used at the receiving side is a copy that is exactly the same as the information about the characteristics of the pseudo distribution channels used at the transmitting side.

[0031]

The transmission/reception method according to the first embodiment uses diagonal line propagation channels between transmitting/receiving antennas as described above, which have not been used in the conventional MIMO communication system. To this end, this transmission/reception method generates and uses a plurality of characteristics of pseudo propagation channels (corresponding models, etc.), each cross-correlation of which is low. In this transmit/receive system, a transmission device includes a control unit for generating and adjusting pseudo-propagation channel characteristics inside or outside a base band node, and includes and includes a pseudo-propagation channel characteristic device for reflecting (e.g., overlaying and synthesizing) pseudo-propagation channel characteristics in target transmission data at the baseband node. This transmission/reception method reduces cross-correlation between respective propagation channels, in other words, enhances independence for MIMO propagation channels including diagonal link propagation channels by exploiting their characteristics of pseudo propagation channels. As a result, this transmission/reception method realizes the transmission of information at most N×M times faster and improves resource efficiency by using N×M MIMO propagation channels.

[0032]

[Transmission/reception method and system (1)]

In FIG. 1 illustrates the configuration of the transmission/reception system according to the first embodiment, which implements the transmission/reception method according to the first embodiment. In FIG. 1 illustrates its scheme, and Fig. 2 illustrates a detailed configuration example of key parts. The transmission/reception system according to the first embodiment includes a transmission device 1, which is a transmission station, and a reception device 2, which is a reception station, and is a system that performs data transmission/reception by a wireless connection from the transmission device 1 to the receiving device 2 on the real distribution channel P100.

[0033]

The transmission device 1 includes a baseband node 100, a section of a transmission antenna node 103, a distribution channel characteristic control node 104, a transmission data processing node 130, and the like. The main baseband node 100 includes a pseudo propagation channel characteristics device 101 and a MIMO transmission device 102 . The transmit antenna node 103 includes the transmit antennas A1, A2, ... and AN as a plurality (N) of the transmit antennas. The propagation channel response control portion 104 includes a real propagation channel response measurement section 104A and a pseudo propagation path response generation section 104B.

[0034]

The receiving device 2 includes a baseband node 200, a receiving antenna node 106, a propagation channel characteristic control node 109, a code decoder 288, and the like. The main baseband node 200 includes a MIMO receiver 107, a pseudo propagation channel analysis/derivation device 108, an error correction unit 280, and a parallel-to-serial converter 286. The receive antenna node 106 includes receive antennas B1, B2, ... and BM as a set (M) of receiving antennas. The distribution channel characteristic control section 109 includes a real distribution channel characteristic measurement block 109A and a pseudo distribution channel characteristic generating block 109B. Each of the number of antennas N and M is a number set and N ≥ M. In the present embodiment, N = M = 4, that is, the case of a 4×4 MIMO system is illustrated.

[0035]

The actual distribution channel P100 is similar to the example illustrated in FIG. 23. The real distribution channel P100 includes 16 distribution channels obtained by the formula "4×4" and has characteristics corresponding to them. For example, the diagonal line propagation path P12 illustrated in FIG. 23 denotes a propagation path from the second transmit antenna A2 to the first receive antenna B1. The index on the front of the code indicates the receiving antenna, and the index on the back of the code indicates the transmit antenna. For example, the characteristic h12 is the characteristic of the real distribution channel corresponding to the distribution channel P12.

[0036]

In the transmission/reception system according to the first embodiment, the actual propagation path measurement unit 104A of the transmission device 1 or the actual propagation path measurement unit 109A of the reception device 2 measures the characteristics of a plurality (N × M) of the propagation paths in the actual propagation path P100 by using an existing mechanism, such as an SRS signal (probing reference signal). For example, the actual propagation path measurement unit 104A of the transmission device 1 may measure the characteristics using the SRS signal received from the reception device 2 . Alternatively, the actual propagation path measurement unit 109A of the receiving device 2 can measure the characteristics using the SRS signal received from the transmission device 1 and transmit information about the measured characteristics to the transmission device 1. Note that either the real propagation channel characterization unit 104A or the actual propagation channel characterization unit 109A may be used to measure the characteristics of the actual propagation channels. Additionally, depending on the method, the measurement of the characteristics of the actual distribution channels may be omitted. Further, one real propagation channel characterization unit can obtain information about the performance measured by another real propagation channel characterization unit through communication. Such communication can be suitably performed between the transmission device 1 and the reception device 2 . For example, the transmission device 1 can acquire, through communication, information on the characteristics of the actual propagation channels measured by the real propagation channel characteristics measurement unit 109A of the reception device 2.

[0037]

Then, the pseudo-propagation response generating unit 104B of the transmission device 1 or the pseudo-propagation response generating unit 109B of the receiving device 2 generates a plurality (N×M) of pseudo-propagation responses that are similar to the frequency responses to the extent that the frequency response can be approximated, based on the set (N × M) of characteristics of real propagation channels. For example, the pseudo propagation channel characteristic generating section 104B of the transmission device 1 creates a basic pseudo propagation channel characteristic model based on the characteristics measured by the actual propagation channel characteristic measurement block 104A, and further generates another model from the main model by performing a predetermined calculation. These multiple models are created under the condition that cross-correlation between models is low. The transmitting device 1 or the receiving device 2 confirms that the cross-correlation between the plurality of models is sufficiently low, ie it is at least lower than the cross-correlation of the plurality of actual propagation channels. The transmitting device 1 or the receiving device 2 again generates another model for a model that does not satisfy such a cross-correlation condition, that is, models whose cross-correlation is high.

[0038]

In the first embodiment, the pseudo propagation channel characteristics generating unit 104B contains all of the plurality of pseudo propagation channel characteristics (ie, corresponding pseudo delay profile models) that are candidates for use in the storage DB (database) in advance. The pseudo propagation channel characteristics generating unit 104B selects a plurality of pseudo propagation channel characteristics (ie, corresponding multiple models) suitable for data transmission based on the characteristics of the actual distribution channels. The pseudo propagation channel capability generation unit 104B provides and sets information about a plurality of pseudo propagation channel capabilities to be used in the pseudo propagation channel capability apparatus 101 . Specifically, the pseudo propagation channel characteristics apparatus 101 may be implemented with an FIR filter circuit (to be described later), and the pseudo propagation channel characteristics may be set as filter circuit parameters.

[0039]

Note that either pseudo propagation channel response generating block 104B or pseudo propagation channel response generating block 109B can be used to generate pseudo propagation channel responses. For example, the pseudo propagation channel response generating unit 104B on the transmitting side can generate pseudo propagation channel responses, and the pseudo propagation channel response generating unit 109B on the receiving side can similarly generate pseudo propagation channel responses. Alternatively, the pseudo propagation channel response generating unit 104B on the transmitting side can generate pseudo propagation channel responses and provide information about the pseudo propagation channel responses to be used for data transmission to the receiving station 2 by describing it in a frame or guard interval of the data to be transmitted. The pseudo propagation channel capability generation unit 109B on the receiving side accesses the capability information from the information received from the transmitting station 1 and uses it. Note that the transmitting device 1 or the receiving device 2 can perform the calculation to generate real-time pseudo propagation channel characteristic information, but its speed can be increased by executing in such a way as to select a model from the models generated and contained in the DB in advance.

[0040]

The transmission data processing unit 130 has the functions of an encoder and a multiplexer with respect to the transmission target data. The transmission data processing unit 130 encodes the transmission target data for distributing the encoded transmission target data in the pseudo distribution channel characteristic apparatus 101 as a data set D1-DL. The pseudo propagation channel characteristic apparatus 101 reflects a plurality of pseudo propagation channel characteristics in a data set (L) that is transmission target data to create a data set (N) to be transmitted. The pseudo propagation channel characteristics apparatus 101 superimposes the pseudo propagation channel characteristics on the corresponding data, and synthesizes the signals after the superposition.

[0041]

The MIMO transmission apparatus 102 subjects a plurality (N) of transmission data from the pseudo propagation channel characteristics apparatus 101 to a MIMO transmission process and causes it to be transmitted from a plurality (N) of antennas of the transmission antenna node 103 . A group of radio waves from a plurality (N) of antennas reaches the receiving antenna node 106 over a plurality of (N×M) propagation channels.

[0042]

The receiving device 2 receives a plurality of radio waves using a plurality (M) of antennas of the receiving antenna node 106 . The MIMO receiver 107 obtains a plurality (M) of received signals from signals received by a plurality (M) of antennas using a MIMO reception process. The pseudo propagation channel analysis/derivation apparatus 108 analyzes a plurality (M) of received signals by using a plurality of pseudo propagation channel characteristics that are the same as those used on the transmitting side, and extracts a plurality (L) of data. Data E1-EL output from the device 108 analysis/extraction of the characteristics of the pseudo distribution channels, served in block 280 error correction. The functions of error corrector 280, parallel-to-serial converter 286, and code decoder 288 are similar to those in FIG. 23. In error correction block 280, the output data is corrected to obtain more correct information using an error correction process. The output of the error correction block 280 becomes the original time series data by the parallel-to-serial converter 286. The time series data becomes the received data corresponding to the data on the transmitting side by the code decoder 288 . Processor, etc. the receiving devices 2 receive the received data.

[0043]

The pseudo propagation channel response block 109B on the receiving side generates a plurality of pseudo propagation path characteristics (the same copy as on the transmitting side) based on the real propagation channel characteristics in a similar manner as the pseudo propagation channel response block 104B on the transmitting side. Alternatively, the pseudo propagation channel characteristics generating unit 109B at the receiving side can obtain information about a plurality of pseudo propagation channel characteristics used in this manner from the transmission device 1 . The pseudo propagation channel characteristic generating unit 109B sets information about a plurality of pseudo propagation channel characteristics in the pseudo propagation channel characteristic analysis/extraction apparatus 108 . Additionally, between the distribution channel characteristic control node 104 of the transmission device 1 and the distribution channel characteristic control node 109 of the reception device 2, a connection for control communication can be set up separately from the connection of a plurality of distribution channels for transmitting/receiving data, and the connection can be used for communication related to measurement characteristics of real distribution channels, and exchange of information about the characteristics of pseudo distribution channels.

[0044]

As illustrated in FIG. 1, this transmission/reception system realizes multiplexed transmission by reflecting the characteristics of pseudo propagation channels in the data, so that diagonal propagation channels in the real propagation channel P100 can also be used. This makes it possible to improve the spectral efficiency in N×M MIMO transmission/reception. Note that this can be done such that a real propagation channel response measuring unit or a pseudo propagation channel response generating unit is provided in only one of the transmission device 1 and the reception device 2.

[0045]

[Transmission/reception method and system (2)]

In FIG. 2 illustrates a detailed configuration example of the transmission/reception method and its system according to the first embodiment. Note that in Fig. 2, the receiving node on the side of the transmitting station 1 and the transmitting node on the side of the receiving station 2 are omitted. The present embodiment illustrates the case of a 4×4 MIMO system. The transmission rate increase according to the present embodiment reaches 16 times obtained by the formula "4×4= ⁴² " to the maximum.

[0046]

In general, it cannot be said that the characteristics of the four propagation channels from one antenna on the transmitting side towards the four antennas on the receiving side are independent of each other in a 4 × 4 MIMO system. on the receiving side face each other, the propagation delay times of the propagation channels become essentially equal to each other. In the case where there are multiple reflectors in their vicinity, the propagation delay effect of the reflected wave becomes low, with the result that the cross-correlation approaches unity.

[0047]

For this reason, for example, in an N×N MIMO system, communication is performed using only the number of antennas facing each other, that is, only propagation channels corresponding to N, even if there are N ² propagation channels initially. In the case where N = 4, the number of distribution channels is 16, but in practice only four distribution channels are used. In the case where N = 16, the number of distribution channels is 256, but in practice only 16 distribution channels are used.

[0048]

The transmission/reception method and system thereof according to the first embodiment illustrated in FIG. 2 also use such diagonal line propagation channels. For this reason, this transmit/receive system is provided with 16 pseudo propagation channels. The pseudo propagation channel characteristics apparatus 101 and the pseudo propagation characteristics analysis/extraction apparatus 108 illustrated in FIG. 2 respectively include 16 pseudo distribution channels. This transmission/reception system uses these pseudo propagation channels to multiply the radio waves (ie, the corresponding data signals) of the respective real propagation channels by the pseudo propagation channel characteristic, which is a gain characteristic to reduce cross-correlation.

[0049]

In FIG. 2, the transmitting station 1 is a transmission device such as a wireless base station, and the receiving station 2 is a receiving device such as a user terminal. In FIG. 2 illustrates the configuration of the baseband node at the transmitting station 1 and the configuration of the baseband node at the receiving station 2 as main components, but the illustration of other existing components is omitted. Note that in the case where the receiving station 2 is a user terminal, a controller, a memory, a storage, a communication device of another communication interface, a display device, an input device, and a battery are given as examples of other components.

[0050]

As in FIG. 1, the transmission station 1 includes a pseudo propagation channel characteristic apparatus 101, a MIMO transmission apparatus 102, a transmission antenna assembly 103, which is a MIMO antenna assembly on the transmission side, and a propagation channel characteristic adjustment portion 104. Note that, in the first embodiment, the propagation channel characteristic control portion 104 is installed in the base band node of the transmitting station 1, but may be installed outside the base band node as another embodiment.

[0051]

The receiving station 2 includes a receiving antenna node 106, which is a receiving side MIMO antenna node, a MIMO receiving device 107, a pseudo propagation channel analysis/derivation device 108, and a propagation channel characteristic adjustment node 109 . Note that in the first embodiment, the propagation channel characteristic control portion 109 is installed in the base band node of the receiving station 2, but may be installed outside the base band node as another embodiment. In the case where the entire communication system is FDD (Frequency Division Duplex), in the distribution channel characteristic control section 104 of the transmitting station 1, the partner station, i.e., the receiving station 2 in FIG. 1 can measure the frequency response of the propagation channel by the transmission frequency only on the side of the partner station. Therefore, a report is received from the propagation path control portion 109 of the receiving station 2. At this time, the reference signal SRS required for measurement is transmitted from the transmitting station 1 in accordance with the communication rules. Further, in the case where the entire communication system is TDD (Time Division Duplex), communication is performed on the same frequency. Accordingly, the receiving station 2 side is forced to transmit the SRS reference signal, the transmitting station 1 side performs the measurement, and the propagation channel characteristic control section 104 performs the measurement control and the measurement result adjustment. The bidirectional dotted lines between the distribution channel characteristic control node 104 and the distribution channel characteristic control node 109 illustrated in FIG. 1 denote the above process. Note that in the case where the cross-correlation between the generated pseudo propagation channel characteristics is high, the propagation channel characteristic control section 104 or the propagation channel characteristic control section 109 discards the latest characteristic and generates a new one.

[0052]

The transmit antenna node 103 includes the transmit antennas A1, A2, A3, and A4, which are a plurality (N=4 in the present embodiment) of individual MIMO antennas on the transmit side. Radio waves are radiated from each transmitting antenna of the transmitting side MIMO antenna assembly 103 towards free space. The receive antenna node 106 has receive antennas B1, B2, B3, and B4, which are a plurality (in the present embodiment, M=4) of individual receive side MIMO antennas. Each receiving antenna of the receiving side MIMO antenna node 106 receives radio waves from free space.

[0053]

The pseudo-propagation characteristic apparatus 101 of the transmitting station 1 receives transmission data groups D100, D200, D300, and D400 from an upper layer such as a processor for control as a set of data that are transmission targets. Each of the transmission data groups consists of four data. For example, transmission data group D100 is composed of data D1, D2, D3, and D4 as four data. The transmission data groups are a plurality of parallel and independent data groups. If the number of data in one transmission data group is L, L is 4 in the present embodiment.

[0054]

The pseudo propagation channel characteristic apparatus 101 on the transmitting side approximately includes a plurality (in the present embodiment, four according to the number of antennas N) of pseudo propagation channel apparatus units 1011, 1012, 1013, and 1014. Each of the pseudo distribution channel device blocks further includes separate pseudo distribution channels, which are a plurality (in the present embodiment, four according to the data amount L) of pseudo distribution channels. Namely, the pseudo propagation channel characteristic device 101 includes a total of 16 pseudo propagation channels obtained by the formula "4×4". For example, the pseudo distribution channel device block 1011 includes distribution pseudo channels PP11, PP12, PP13, and PP14. The pseudo distribution channel device block 1012 includes distribution pseudo channels PP21, PP22, PP23, and PP24. For example, the distribution pseudo-channel PP11 is a circuit configured to overlay the first characteristic of the distribution pseudo-channel on the data D1 as an input. Pseudo propagation channel PP12 is a circuit capable of superimposing a second characteristic of a pseudo propagation channel on data D2 as an input. Pseudo propagation channel PP13 is a circuit capable of superimposing a third characteristic of a pseudo propagation channel on data D3 as an input. Pseudo propagation channel PP14 is a circuit capable of superimposing a fourth pseudo propagation channel characteristic on data D4 as an input. For example, the pseudo distribution channel unit 1011 synthesizes the four outputs of the four pseudo distribution channels PP11 to PP14 by adding or the like. and brings them out. The output of D121 after synthesis goes to a separate MIMO processing block 1021. The four outputs of the four pseudo distribution channel device nodes are labeled outputs D121, D122, D123, and D124.

[0055]

The MIMO transmission device 102 includes a plurality (in the present embodiment, four according to the number of antennas N) individual MIMO processing units, which are designated individual MIMO processing units 1021, 1022, 1023, and 1024. The outputs from the pseudo propagation channel characterizer 101 are respectively input to respective separate MIMO processing blocks 1021, 1022, 1023 and 1024 to be subjected to MIMO processes. In FIG. 2, the respective MIMO processes of the four separate MIMO processing units are denoted Ψ1-Ψ4. Ψ is a function and has (ω, a, θ, t) as variables. ω denotes angular frequency, a denotes amplitude, θ denotes phase, and t denotes time.

[0056]

The respective signals after the MIMO processes in the individual MIMO processing units are sent to the respective transmit antennas of the transmit antenna node 103 and are transmitted as radio waves. For example, the signal after the MIMO process in a separate MIMO processing block 1021 is sent to the transmitting antenna A1. These radio waves transmitted from the transmitting antennas propagate along the propagation channel P100, which are real-space propagation channels, and are received by a plurality (in the present embodiment, M = 4) of the receiving antennas of the receiving antenna node 106 at the receiving station 2. As illustrated in FIG. . 1 and 2, the propagation path P100 between the plurality of transmission antennas and the plurality of reception antennas has a plurality of (N × M = 4 × 4 = 16) propagation paths including diagonal path paths. The characteristics of the respective distribution channels denote the characteristics h11, h12, h13, h14, h21, h22, h23, h24, h31, h32, h33, h34, h41, h42, h43 and h44. The characteristics of the propagation paths of the mutually facing antenna pairs (propagation channels P11, P22, P33 and P44 described above) are the characteristics of h11, h22, h33 and h44, and the other characteristics are the characteristics of the diagonal propagation channels.

[0057]

The four separate MIMO processing units of the MIMO transmission device 102 respectively perform MIMO processes corresponding to the characteristics h11, h22, h33, and h44 of the four mutually facing propagation channels. The 16 pseudo propagation channels of the pseudo propagation characteristics device 101 correspond to the characteristics of a plurality of (4 × 4 = 16) propagation channels from characteristic h11 to characteristic h44 in the real space propagation channel P100, and a plurality of (4 × 4 = 16) characteristics of pseudo propagation channels are provided to reduce cross-correlation between distribution channels. These pseudo propagation channel characteristics of the plurality of pseudo propagation channels are denoted by Φ11, Φ12, Φ13, Φ14, Φ21, Φ22, Φ23, Φ24, Φ31, Φ32, Φ33, Φ34, Φ41, Φ42, Φ43 and Φ44 in order from propagation pseudochannel PP14 to propagation pseudochannel PP14. The generation of these characteristics of the plurality of pseudo propagation channels will be described next.

[0058]

The plurality of individual pseudo propagation channels of the respective pseudo propagation channel device blocks in the pseudo propagation channel characteristics device 101 receives pseudo delay profile model information (in other words, pseudo propagation channel characteristics information) from the distribution channel characteristics control node 104 . The transmission data groups are respectively characterized by the transfer functions of the plurality of pseudo distribution channels of the four pseudo distribution channel device nodes in the pseudo distribution channel characteristics apparatus 101 . The four outputs (that is, signals of corresponding data to be transmitted) of the pseudo propagation channel characteristics device 101 are respectively supplied to four MIMO processing units. The MIMO processing blocks add the MIMO function to the output signals accordingly (in other words, they become frame MIMO signals). The respective signals are then fed into the four transmitting antennas and transmitted as radio waves. The four receiving antennas at the receiving station 2 respectively receive these groups of radio waves.

[0059]

The receiving antenna B1 receives radio waves from the four transmitting antennas through the characteristics h11, h12, h13 and h14 of the four propagation channels. The receiving antenna B2 receives radio waves from the four transmitting antennas through the characteristics h21, h22, h23 and h24 of the four propagation channels. The receiving antenna B3 receives radio waves from the four transmitting antennas through the characteristics h31, h32, h33 and h34 of the four propagation channels. The receiving antenna B4 receives radio waves from the four transmitting antennas through the characteristics h41, h42, h43 and h44 of the four propagation channels.

[0060]

The signals received by the four receiving antennas are respectively input to four respective MIMO receiving units in the MIMO receiving apparatus 107 . Each of the MIMO receivers 1071, 1072, 1073, and 1074 performs a MIMO analysis process, and the MIMO receivers 1071, 1072, 1073, and 1074 respectively generate processing outputs D171, D172, D173, and D174. The respective MIMO analysis processes of the four MIMO receiver units denote the reception side propagation channel analysis functions Ψ1r-Ψ4r. The correspondence between the distribution channel analysis function Ψ1r-Ψ4r of the receiving side, the propagation channel characteristics h11-h44, and the pseudo propagation channel characteristics Φ11-Φ44 on the transmitting side are indicated in the following Formulas A.

[0061]

Formulas A:

Ψ1r = D100D1 × Φ11*h11 + D200D1 × Φ12*h12 + D300D1 × Φ13*h13 + D400D1 × Φ14*h14,

Ψ2r = D100D2 × Φ21*h21 + D200D2 × Φ22*h22 + D300D2 × Φ23*h23 + D400D2 × Φ24*h24,

Ψ3r = D100D3 × Φ31*h31 + D200D3 × Φ32*h32 + D300D3 × Φ33*h33 + D400D3 × Φ34*h34,

Ψ4r = D100D4 × Φ41*h41 + D200D4 × Φ42*h42 + D300D4 × Φ43*h43 + D400D4 × Φ44*h44.

In the above formulas, the mathematical symbol "×" denotes multiplication, and the mathematical symbol "*" denotes the convolution integral in the case when the calculation is performed in the frequency domain, or indicates that the multiplication is performed in the case when the calculation is performed in the time domain. Further, for example, data D100D1 corresponds to data D1 in transmission data group D100 illustrated in FIG. 2. MIMO receivers 1071, 1072, 1073, and 1074, respectively, perform propagation channel measurements based on the SRS reference signal described in FIG. 1 acquire and adjust the characteristics data of the functions Ψ1r, Ψ2r, Ψ3r and Ψ4r and use them for subsequent signal extraction during the actual data transmission period. In the above formula, when the SRS reference signal is generated, the data group D100D1 to D400D4 is set to a constant value based on the communication rules. Namely, in the case where the values of the data group D100D1-D400D4 are the same with each other, the MIMO receiving units 1071, 1072, 1073, and 1074 can measure the characteristics of the propagation channels by the following Formulas B.

[0062]

Formula B:

Ψ1r-srs = <Φ11*h11, Φ12*h12, Φ13*h13, Φ14*h14>,

Ψ2r-srs = <Φ21*h21, Φ22*h22, Φ23*h23, Φ24*h24>,

Ψ3r-srs = <Φ31*h31, Φ32*h32, Φ33*h33, Φ34*h34>,

Ψ4r-srs = <Φ41*h41, Φ42*h42, Φ43*h43, Φ44*h44>.

Here, when the SRS reference signal is measured, each antenna on the transmitting side is operated at intervals. In this regard, the characteristic of the propagation channel can be measured for each branch on the receiving side. For this reason, in the above formulas, it is expressed as a set of information about the characteristics of each distribution channel. The measurement results of these characteristics of the 16 propagation channels are adjusted to have a low correlation with each other. Namely, in conventional 4×4 MIMO, when the SRS reference signals received by the respective antennas are expressed by adding p to their suffix, the following Formulas C are obtained.

[0063]

Formula C:

Ψ1r-srs-p = <h11, h12, h13, h14>,

Ψ2r-srs-p = <h21, h22, h23, h24>,

Ψ3r-srs-p = <h31, h32, h33, h34>,

Ψ4r-srs-p = <h41, h42, h43, h44>.

Although these signals have a cross-correlation problem, each of the propagation pseudo-channel characteristics Φ11-Φ44 is superimposed in the Formulas B described above in the first embodiment. In this regard, it becomes possible to reduce the cross-correlation due to the effect of superimposing the characteristics of the pseudo propagation channels.

[0064]

Note that the control of these reference SRSs and the control of measured propagation channel response information are performed in the distribution channel response control section 104 and the distribution channel response control section 109 illustrated in FIG. 1. These four processing outputs are respectively input to four pseudo propagation channel analysis/extraction units of the pseudo propagation channel analysis/extraction apparatus 108 . The four pseudo propagation channel analysis/extraction units are pseudo propagation channel analysis/extraction nodes 1081, 1082, 1083, and 1084. Each of the pseudo propagation channel analysis/extraction units further includes four pseudo propagation channel analysis/extraction nodes. For example, the node 1081 analysis/extraction of pseudo distribution channels includes blocks PR11, PR12, PR13 and PR14 analysis/extraction of pseudo distribution channels. For example, the pseudo propagation channel analysis/derivation block 1082 includes pseudo propagation channel analysis/derivation blocks PR21, PR22, PR23, and PR24.

[0065]

For example, the four pseudo propagation channel analysis/extraction modules of the pseudo propagation channel analysis/extraction unit 1081 respectively analyze the processing output D171 using the respective characteristics of the pseudo propagation channels to extract signals. The pseudo propagation channel characteristics (and corresponding pseudo delay profile models) used by the pseudo propagation channel characterization analyzer/extractor 108 on the receiving side are copies that are the same as the pseudo propagation channel characteristics used by the pseudo propagation channel characteristics apparatus 101 on the transmitting side. For example, the propagation pseudochannel PP11 and the pseudo propagation channel analysis/extraction unit PR11 use the same pseudo propagation channel characteristic Φ11.

[0066]

For example, in a pseudo propagation channel analysis/derivation block 1081, four pseudo propagation channel analysis/derivation nodes perform cross-correlation calculations with pseudo delay profile models configured to amplify characteristics h11, h12, h13 and h14 of real propagation channels. In a pseudo propagation channel analysis/derivation node 1082, four pseudo propagation channel analysis/derivation blocks perform cross-correlation calculations with pseudo delay profile models configured to enhance characteristics h21, h22, h23 and h24 of real propagation channels. In a pseudo propagation channel analysis/derivation node 1083, four pseudo propagation channel analysis/derivation blocks perform cross-correlation calculations with pseudo delay profile models configured to amplify propagation channel characteristics h31, h32, h33 and h34. In a pseudo propagation channel analysis/derivation node 1084, four pseudo propagation channel analysis/derivation blocks perform cross-correlation calculations with pseudo delay profile models configured to enhance propagation channel characteristics h41, h42, h43, and h44. As a result, the pseudo propagation channel analysis/extraction apparatus 108 obtains 16 "4x4" data as outputs. The pseudo propagation channel analysis/extraction apparatus 108 obtains received data groups E100, E200, E300, and E400 as four received data groups. For example, the node 1081 analysis/retrieval of pseudo distribution channels extracts the data E1-E4 to become the corresponding group E100 of the received data. These data E1-E4 correspond to the data D1-D4 of the transmission data group D100 on the side of the transmission station 1.

[0067]

The above will be explained using mathematical formulas. The cross-correlation of the characteristics of the distribution channels between the received signals received from the respective branches becomes quite low due to the superimposition of the corresponding characteristic of the pseudo propagation channel. It is assumed that the groups of signals transmitted in this manner are represented by Formulas A. For example, the MIMO receiving unit 1071 performs correlation extraction using the obtained four propagation channel characteristics <Φ11*h11, Φ12*h12, Φ13*h13, Φ14*h14> to obtain a group data according to the following Formula D.

[0068]

Formula D:

<D100D1 × Φ11*h11, D200D1 × Φ12*h12, D300D1 × Φ13*h13, D400D1 × Φ14*h14>

This group of data becomes output D171 of the MIMO receiving block 1071 and is fed into the pseudo propagation channel analysis/extraction block 1081 provided in the next step. In the pseudo propagation channel analysis/extraction unit 1081, four pseudo propagation channel analysis/extraction units PR11, PR12, PR13 and PR14 receive the output D171 in parallel. At this time, the measurement results of the SRS reference signal Φ11*h11, Φ12*h12, Φ13*h13, and Φ14*h14 are respectively provided from the propagation path characteristic control portion 109 to the four pseudo propagation path analysis/extraction units PR11, PR12, PR13, and PR14 described above. . Each of the pseudo propagation channel analysis/derivation nodes performs a correlation extraction calculation between the data of the corresponding SRS reference signal measurement result and the data group indicated in Formula D. For example, the pseudo propagation channel analysis/derivation block PR11 uses the SRS reference signal measurement result Φ11* h11 to perform correlation calculation with the data group indicated in Formula D as in the following Formula E.

[0069]

Formula E:

[0070]

"Δ" in Formula E becomes almost zero if the characteristics of the pseudo propagation channels work well in the results of cross-correlation calculations with signals from other branches h12, h13 and h14, each of whose cross-correlation is low. As described above, if the pseudo propagation channel analysis/extraction block PR11 is given as an example, the D1 data obtained by the corresponding branch h11 can be extracted as the E1 data.

[0071]

[Characteristics of Pseudo Distribution Channels]

In FIG. 3 and FIG. 4 illustrates a method for generating a pseudo-delay profile model, which is a characteristic of a pseudo propagation channel. In FIG. 3 illustrates, as part 1 thereof, a method for measuring real propagation channel performance, measured wireless propagation channel performance, and delay profile-based pseudo propagation channel models that are derived therefrom. In FIG. 4 illustrates, as part 2 thereof, a method for generating pseudo propagation channel characteristics and the generated pseudo delay profile models. In the first embodiment and the second embodiment (to be described later), as characteristics of the plurality of pseudo propagation channels, parts of the characteristics are modeled using measurement results of the plurality of characteristics of real propagation channels, and the characteristics subject to modification are used to reduce cross-correlation between models.

[0072]

In graph (a) in FIG. 3 illustrates an SRS signal to be transmitted from one device (eg, receiving station 2). The horizontal axis of the graph indicates the frequency (f) [Hz], and its vertical axis indicates the intensity of the radio waves to be transmitted. The SRS signal is a signal for measuring the frequency response of a radio wave channel and has the same amplitude and the same phase within the frequency band used. One vertical line corresponds to a subcarrier.

[0073]

In graph (b) in FIG. 3 illustrates radio waves, to which are added the frequency characteristics of actual propagation channels in the form of radio waves, which reach another device capable of receiving the SRS signal illustrated in graph (a) (for example, the transmitting station 1). A frame indicated by a dotted line corresponds to a resource block that combines a plurality of subcarriers.

[0074]

In the example in FIG. 23 described above, in the case of the FDD method (FDD: Frequency Division Duplex), the frequency differs between the downlink and uplink. For this reason, for example, the transmitting station 1 causes the receiving station 2 on the other side to transmit the SRS signal from it just prior to data transmission. In the case of the TDD method (TDD: Time Division Duplex), the frequency is the same between the downlink and uplink. For this reason, for example, the transmitting station 1 measures the characteristics of the actual propagation channels based on the SRS signal from the receiving station 2 on the other side, or causes the other side to send the measurement result of the actual propagation channels as a report.

[0075]

In plot (c) in FIG. 3 illustrates the phase responses of the propagation channel responses that are paired with the frequency responses illustrated in graph (b). The horizontal axis of the graph indicates the phase [rad]. Its vertical axis denotes the range from -π to π centered on 0.

[0076]

Further, by converting the information in graphs (b) and (c) in FIG. 3, from the frequency domain to the time domain (time-frequency conversion), the delay profile characteristics illustrated in plots (d) and (e) in FIG. 3. This time-frequency transformation can be realized with an inverse FFT process (FFT: Fast Fourier Transform). Plot (d) illustrates the amplitude of the characteristics of the delay profiles. The horizontal axis of the graph represents time (t). In particular, the direct wave d0, the first reflected wave d1, the second reflected wave d2, the third reflected wave d3 and the fourth reflected wave d4 are indicated. Plot (e) illustrates the phases of the delay profile response.

[0077]

Further, in plots (f) and (g) in FIG. 4 illustrates pseudo-delay profile models in which the significant components in the delay profiles illustrated in plots (d) and (e) in FIG. 3 are removed and simplified, that is, which are modeled as pseudo-delay profile models. By subjecting the delay profiles illustrated in graphs (d) and (e) in FIG. 3, the Z-transform on both sides produces the models illustrated in plots (f) and (g) in FIG. 4.

[0078]

The models illustrated in plots (f) and (g) in FIG. 4 are forced to have positive and negative components on the time axis due to the Z-transform on both sides. This transformation, in other words, modeling, is necessary to correctly reflect the inversion of the plane of polarization that occurs during the propagation of radio waves, for example, reflections from the wall surface on the phase axis. In graphs (f) and (g), their horizontal axis represents time (t). In graph (f), its vertical axis indicates the intensity of the radio waves. In plot (g), its vertical axis denotes phase and ranges from -n to n centered on 0. In plot (f), what appears as vertical lines denotes direct wave a0, first reflected wave a1, second reflected wave a2 , the third reflected wave a3 and the fourth reflected wave a4. In graph (g), the phases can be seen at time positions corresponding to the time positions of the vertical lines in graph (f).

[0079]

[Cross-correlation reduction method]

Pseudo-delay profile models are generated for all 16 propagation channels illustrated in FIG. 23. Namely, for example, 16 types of pseudo-delay profile models are used, each of whose cross-correlation is low. In FIG. 5 illustrates a method for reducing cross-correlation of diagonal link propagation channels in MIMO. In FIG. 5 illustrates pseudo-delay profile models corresponding to the 16 propagation channels of the 4x4 MIMO system illustrated in FIG. 2. Plots (f1) and (g1) in FIG. 5 denote the first model, plots (f2) and (g2) denote the second model, plots (f3) and (g3) denote the third model, and plots (f4) and (g4) denote the fourth model. Although they are omitted, there are corresponding patterns in the same way, and plots (f16) and (g16) denote the sixteenth pattern.

[0080]

On each of the plots (f1), (f2), (f3), (f4), and (f16) in FIG. 5, the horizontal axis denotes time and the vertical axis denotes intensity in a manner similar to plot (f) in FIG. 4. In each of the graphs (g1), (g2), (g3), (g4) and (g16) in FIG. 5, the horizontal axis denotes time and the vertical axis denotes phase in a manner similar to plot (g) in FIG. 4. These 16 models correspond to the amplitude and phase of the respective characteristics of the 16 propagation channels illustrated in FIG. 2. Plots (f1) and (g1) respectively correspond to the amplitude and phase of the characteristic h11. Graphs (f2) and (g2) correspond to the amplitude and phase of the characteristic h21. Graphs (f3) and (g3) correspond to the amplitude and phase of the characteristic h31. Graphs (f4) and (g4) correspond to the amplitude and phase of the characteristic h41. Similarly, graphs (f16) and (g16) correspond to the amplitude and phase of the h44 characteristic.

[0081]

The state of the delay wave of each model differs slightly in time, and the phase additionally differs slightly. In order to reduce cross-correlation, it is effective to increase the delay wave component. Here, it is undesirable to make a large adjustment, since this causes a change in the frequency response. In the case where the interval of the delay wave is considered to be the sampling time, the frequency response of the response of the delay profile is most dependent on the interval of the delay wave.

[0082]

Therefore, in the configuration illustrated in FIG. 2, the pseudo-delay profile models illustrated in FIG. 5 are sent to the pseudo distribution channels (pseudo distribution channels characteristics apparatus 101 and pseudo distribution channels analysis/extraction apparatus 108) as they are. As a result, in the delay profile characteristic of a real propagation channel, the effect of reducing components such as a large number of sidelobes existing around the model wave time can be obtained, and this causes the cross-correlation to become low.

[0083]

[Comparison of cross-correlation possibilities]

In FIG. 6 illustrates a comparison of cross-correlation capabilities related to spreading using the set of pseudo propagation channel characteristics described above (and corresponding pseudo delay profile models). In the graph illustrated in FIG. 6, the horizontal axis indicates the number of antennas between transmission and reception, and the vertical axis indicates the channel capacity C _ave (bps/Hz). The straight lines 600 denote the capabilities of the existing N×N MIMO method. Each case ρ = {0, 0.5, 0.8, 0.9} is denoted using a correlation coefficient ρ. The straight line 601 indicates the improvement effect in the case of the first method as an extension described above. The first method is the method described in Japanese Patent Application No. 2018-118353. A curved line 602 indicates an improvement effect in the case of the second method according to the first embodiment. In the case of the forward links 600 of the MIMO method and in the case of the forward link 601 of the first method, the channel capacity increases in proportion to the number of antennas between transmission and reception. On the other hand, in the case of curved line 602 of the second method, the channel capacity increases in proportion to the square of the number of antennas between transmission and reception. As illustrated in FIG. 6, as an effect related to the expansion described above, in the case of the method according to the first embodiment, much higher throughput than the existing MIMO method can ideally be realized.

[0084]

[SRS signal influence]

Note that since the characteristics of the propagation channels are measured and estimated using the SRS signal described above in the MIMO method, the user data rate may be severely reduced due to the influence of the SRS signal. This will be further explained by comparing the 2×2 MIMO example with the 16×16 MIMO example. 2 and 16 times for MIMO 16×16. In the second method, the transmission rate is 4, obtained from the formula "2 ² " in the case of 2 × 2 MIMO, and the transmission rate is 256, obtained from the formula "16 ² " in the case of 16 × 16 MIMO. When the time of one frame is T and the period SRS (that is, the period for the SRS signal) within one frame is τ, the efficiency η in each case is as follows. In the case of 2×2 MIMO, it becomes "η ₂ × ₂ = 4/(T-2τ)". In the case of 16×16 MIMO, it becomes "η16×16=256/(T-16τ)". In this regard, their ratio becomes equal to "η16×16/η2×2 = 256/4 × (T-2τ)/(T-16τ) = 256/4 = 64". In this regard, it can be seen that the greater the number of antennas between transmission and reception, the smaller the influence of the SRS period.

[0085]

[Technical results and the like. (one)]

As described above, according to the first embodiment, resource efficiency improvement such as frequency can be realized with respect to MIMO. In the transmission/reception system according to the first embodiment, independence of MIMO propagation channel characteristics is enhanced by using a scheme for generating and reflecting base band node pseudo propagation channel characteristics with respect to diagonal link propagation channels between transmitting/receiving antennas, which were not used in the conventional MIMO system. As a result, according to the first embodiment, it is possible to realize an increase in the information rate up to NxM times in an NxM MIMO system. Additionally, it should be specifically noted that in conventional MIMO there is a limitation N ≥ M between the number of transmit/receive antennas, but it is clear that it is possible to provide a new MIMO method that is not subject to this limitation in the use of pseudo propagation channel characteristics according to the present invention. Further, according to the first embodiment, even in the case where it is difficult to increase the number of transmission/reception antennas (for example, 16×16, 256×256, or the like), and the number of transmission/reception antennas is thus small (for example, 2×2), it is possible to improve the spectral efficiency and information rate by multiplexing using pseudo propagation channels.

[0086]

(Second embodiment)

The transmission/reception method and its system according to the second embodiment of the present invention will be described with reference to FIG. 7-fig. 10. Next, components in the second embodiment other than those of the first embodiment will be described. The transmission/reception method according to the second embodiment corresponds to a modification example of the transmission/reception method according to the first embodiment.

[0087]

[Band issue]

It is possible to improve performance such as transmission rate in the MIMO system illustrated in FIG. 6 described above in terms of spectral efficiency and the like. The transmitted signal has a predetermined wide bandwidth. As illustrated in graph (b) in FIG. 3, a wideband signal propagated over an actual propagation channel is not flat due to frequency selective fading. In the extreme case, even if either is received, frequency parts that are insufficient for communication exist in each of the 16 4×4 MIMO propagation channels illustrated in FIG. 2. For this reason, the estimated value of the MIMO link rate obtained by using the entire frequency band cannot be obtained if this continues. Numerically, in the case where the bandwidth is 20 MHz, the quadrature modulation is QPSK, and the MIMO level is 2×2 MIMO, the transmission rate R is the formula that follows, by ignoring the effect of frequency selective fading.

[0088]

R = BW × eff _DSB × eff _{16-QAM-spectrum} × n _MIMO = 20 MHz × 1/2 × 4 bps⋅Hz × 2 = 80 Mbps.

Here, BW denotes the bandwidth, eff _DSB denotes the spectral efficiency due to SSB modulation on both sides, eff _{16-QAM-spectrum} denotes the rate efficiency in 16-digit QAM modulation, and n _MIMO denotes the nxn MIMO rate increase. However, as described above, the larger the bandwidth, the more the effect of frequency selective fading is felt. As a result, it becomes difficult to use the entire 20 MHz band in the above formula. The second embodiment also solves such a problem.

[0089]

[Transmission/reception system]

In FIG. 7 illustrates a configuration example of a MIMO system as a transmission/reception system according to the second embodiment. FIG. 7 is a Figure in which an element specific to the second embodiment is added to the 2×2 MIMO part in the MIMO system illustrated in FIG. 2 according to the first embodiment. A diversity mechanism 110 is added between the MIMO processing node 102 and the transmitting antenna node 103 at the transmitting station 1. The receiving station 2 differs from the receiving station of the first embodiment in the configuration of the MIMO receiving apparatus 107. Additionally, a receive side diversity processing node 120 is added between the MIMO receiver 107 and the pseudo propagation channel analysis/extraction apparatus 108 .

[0090]

The two outputs of the individual MIMO processing units 1021 and 1022 on the side of the transmitting station 1 are outputs SA1 and SA2. The two outputs SA1 and SA2 are input to the diversity engine 110 and fed to an adder 151 configured to generate the sum of the two outputs SA1 and SA2 (hereinafter referred to as "sum signal SB1"), and an adder 152 configured to generate the difference of the two outputs SA1 and SA2 (hereinafter referred to as "difference signal SB2"). The sum signal SB1 is transmitted from the transmission antenna A1, and the difference signal SB2 is transmitted from the transmission antenna A2. Each of the transmitted radio waves is received by the receiving antennas B1 and B2 of the receiving antenna node 106 over the four propagation channels P11, P21, P12 and P22 (and the corresponding characteristics h11, h21, h12 and h22) between the 2×2 antennas in the actual propagation channel P100.

[0091]

The signals C1 and C2 received by the receive antenna node 106 are input to the MIMO receiver 107 and are respectively fed directly to the MIMO processing nodes 107A and 107B. The MIMO processing node 107A includes separate MIMO processing blocks 1071a and 1071b, and the MIMO processing node 107B includes separate MIMO processing blocks 1072a and 1072b. The received signal C1 is input to two separate MIMO processing blocks 1071a and 1071b, and the received signal C2 is input to two separate MIMO processing blocks 1072a and 1072b.

[0092]

The characteristics h11, h12, h21 and h22 of the respective actual propagation channels are transmitted from the receiving side MIMO control nodes in the propagation channel characteristics control node 109 to four separate MIMO processing units of the MIMO receiver 107 . On the basis of this, the respective individual MIMO processing units extract the sum signal SB1 and the difference signal SB2 on the transmitting side from the received radio wave signals in accordance with their respective characteristics. For example, the sum signal SB1, characterized by the characteristic h11 of the propagation channel P11, reaches the first receive antenna B1 from the transmitting antenna A1, and the difference signal SB2, characterized by the characteristic h12 of the propagation channel P12, reaches the first receiving antenna B1 from the transmitting antenna A2. Similarly, the sum signal SB1 with characteristic h21 and the difference signal SB2 with characteristic h22 respectively reach the second receive antenna B2 from the transmit antennas A1 and A2.

[0093]

A separate MIMO processing unit 1071a may extract the sum signal SB1 from the first transmit antenna A1 based on the characteristic h11 from the received signal C1. A separate MIMO processing unit 1071b may extract the difference signal SB2 from the second transmit antenna A2 based on the characteristic h12 from the received signal C1. A separate MIMO processing unit 1072a may extract the sum signal SB1 from the first transmit antenna A1 based on the characteristic h21 from the received signal C2. A separate MIMO processing unit 1072b may extract the difference signal SB2 from the second transmit antenna A2 based on the characteristic h22 from the received signal C2.

[0094]

Based on the above, at the four outputs D21, D22, D23 and D24 of the MIMO receiver 107, two sum signals SB1 and two difference signals SB2 can be received. However, these two respective signals are not the same with each other. This is due to the fact that they are transmitted and received through different propagation channels and differ from each other in the effect of frequency-selective fading.

[0095]

Note that in Fig. 7 only illustrates the transmit/receive antennas and 2×2 parts as propagation paths, but other transmit/receive antennas and other MIMO parts may have a similar configuration.

[0096]

[Frequency selective fading]

In FIG. 8 illustrates an example of a simulation of frequency selective fading in the form of multipath fading over a 15 MHz width of the 5 GHz band. In graph (A) in FIG. 8 illustrates a delay profile using simulation. The horizontal axis of the graph indicates the delay time [ns], and its vertical axis indicates the relative electrical power of the delay wave (dB). In graph (B) in FIG. 8 illustrates the simulation result of frequency selective fading at the location of two different points in the form of multipath fading in the 5 GHz band. The horizontal axis of the graph indicates the frequency (GHz) and its vertical axis indicates the relative electrical power (dB). Spectrum 801 denotes the case of the first point, and spectrum 802 denotes the case of the second point. The bandwidth is about 15 MHz and the interval between each peak and the adjacent fading minimum is about 2 MHz. Moreover, it can be seen that the intensity decay occurs approximately every 5 MHz. In FIG. 8 is an image of the operation affected by the frequency selective fading of the four radio propagation channels illustrated in FIG. 7 are shown for each propagation channel, and an image of the frequency spectra is illustrated in the case where signals passing through four propagation channels are synthesized.

[0097]

[Frequency selective fading removal effect]

In FIG. 9 illustrates the effect of removing frequency selective fading in 2×2 MIMO, which is the diversity according to the second embodiment. The horizontal axis of each graph illustrated in FIG. 9 represents the frequency (f). In FIG. 9, graph (s) indicates the bandwidth response on the transmitting side. Plots (a)-(d) respectively indicate the frequency spectra affected by the impact of frequency selective fading on the performance of the four propagation channels described above. Graph (a) indicates the frequency spectrum of the h11 characteristic of the propagation channel P11, graph (b) indicates the frequency spectrum of the characteristic h12 of the propagation channel P12, graph (c) indicates the frequency spectrum of the characteristic h21 of the propagation channel P21, and graph (d) indicates the frequency spectrum of the characteristic h22 of the channel P22 distribution. For example, looking at the spectrum of graph (a), each of the frequency domains r1, r4, r5, and r8 has a peak, but each of the frequency domains r2, r3, r6, and r7 has a minimum point due to attenuation.

[0098]

In the case where the propagation channels are independent of each other, in other words, in the case where the cross-correlation is low, the effect of frequency selective fading also becomes independent, as illustrated in FIG. 9, and a diversity effect can be expected. Namely, when these spectra of graphs (a)-(d) are synthesized, they become the spectrum illustrated in graph (r) in FIG. 9, and this makes it possible to complement mutually damped frequency domains.

[0099]

In FIG. 7, the receiving side diversity processing unit 120 receives signals D171 and D172, which correspond to outputs D121 and D122, to which eight separate pseudo propagation channels of the transmission side pseudo propagation characteristics device 101 are added, from four outputs (outputs D21 to D24) received from the device 107. receiving MIMO. These signals D171 and D172 are supplied to the pseudo propagation channel analysis/extraction apparatus 108, and processing similar to that in the first embodiment is performed. The pseudo propagation channel analysis/extraction apparatus 108 includes pseudo propagation channel analysis/extraction nodes 1081 and 1082 . For example, the pseudo distribution channel analysis/extraction node 1081 includes four pseudo distribution channel analysis/extraction node blocks PR11 to PR14. Each of the pseudo propagation channel characterization/derivation nodes extracts a signal by analysis based on the corresponding pseudo propagation channel characterization. For example, the pseudo distribution channel analysis/extraction node 1081 receives four data E1-E4, and they become outputs E100 (received data group E100).

[0100]

[Signal Conversion]

The signal conversion performed by the two adders 151 and 152 of the diversity engine 110 illustrated in FIG. 7 will be described with reference to FIG. 10. In FIG. 10 illustrates signal conditioning to reduce frequency selective fading in a MIMO system and illustrates a method for synthesizing two orthogonal signals. Here, two orthogonal signals are considered on the x-axis and y-axis. In graph (A) in FIG. 10 illustrates how vector signal V1 and vector signal V2 on the x-axis are seen from the (x+y, -x-y)/(x-y, -x+y) plane, which is at n/4 rotation positions on the x-y plane. In graph (B) in FIG. 10 illustrates how vector signal U1 and vector signal U2 on the y-axis are also seen from the (x+y, -x-y)/(x-y, -x+y) plane. Each of the vector signals is the following. V1 = V1a + V1b, V2 = V2a + V2b, U1 = U1a + U1b and U2 = U2a + U2b.

[0101]

Here, the addition of vector signal V1 and vector signal U1 is V1 + U1 = V1a + V1b + U1a + U1b = 2U1a, and the difference between vector signal V1 and vector signal U1 is V1 - U1 = V1a + V1b - (U1a + U1b) = 2U2a. In each case, the vector moves along the coordinate axis rotated by π/4.

[0102]

On the other hand, since V1a = U1a, V1b = U2a, V2a = U1b, V2b = U2b, we get V1a + U2a = V1, V1a - U2a = U1. Namely, when the addition or difference of the two signals is generated on the side of the receiving station 2, it returns to the original vector signal on the x-y plane. The receiving side diversity processing portion 120 thus performs the reset process.

[0103]

[Technical results, etc. (2)]

As described above, according to the second embodiment, the following technical results are provided in addition to the technical results according to the first embodiment. As for the reduction in transmission efficiency due to frequency selective fading, which is inherent in each propagation channel in a conventional MIMO system, by using a scheme to generate and reflect the characteristics of pseudo propagation channels at a baseband node in a transmission/reception system. According to the second embodiment, generation and transmission of a sum signal and a difference signal between transmitted signals are performed. A circuit for recovering these signals is provided on the side of the receiving station. As a result, according to the second embodiment, an additional effect of frequency selective fading that is comparable to the number of antennas can be realized, and this can further improve the transmission rate.

[0104]

(Third embodiment)

The transmission/reception method and its system according to the third embodiment of the present invention will be described with reference to FIG. 11-fig. 16. In the third embodiment and the fourth embodiment (to be described later), the case where they are applied in beamforming will be described. In these embodiments, a configuration is illustrated in which multiple pseudo propagation channel signals can be distributed according to communication applications during transmission/reception using a beamforming function. In the third and fourth embodiments according to the present invention, the characteristics of the pseudo propagation channels in beamforming can be freely generated (free generation within the range of cross-correlation requirements) without the need to measure the characteristics of the actual propagation channels.

[0105]

[Review]

In the third embodiment, the problems and solutions of the beamforming function, which plays a major role in fifth generation mobile communication, will be described. The beamforming function is a function of generating a beam focus of radio waves at a desired point (or receiving point) by controlling the amplitude and/or phase of the radio signal from each antenna using a plurality of antennas. However, it is necessary to distribute the same signal to all antennas as an entry condition. For this reason, multiple data may be transmitted simultaneously during a MIMO operation in which multiple antennas may be used individually, but only one data may be transmitted at a time during beamforming.

[0106]

On the other hand, in fifth-generation mobile communication, it is important to separate and parallelize communication paths in order to achieve standardization goals such as communication acceleration, low latency, or high reliability. As the main separation and parallelization of communication paths, the separation and parallelization between the control signal system (C: control signal/data) and the user data system (U: user signal/data) is presented, which is called CU splitting. In addition, there is separation and parallelization between the SRS signal used for measuring propagation channel characteristics and the user data system. In addition, there is separation and parallelization between a notification signal (BCCH: Broadcast Control Channel) or a random access signal (RACH: Random Access Channel). access) that are necessary for initial connection processing of the terminal, and a communication signal after the PDSCH (Physical Channel for Downlink User Separation Information Transfer) or PDCCH (Physical Downlink Control Channel) connection.

[0107]

However, in the case where a plurality of antennas is used as a beamforming function, the beam transmission path becomes single. Therefore, the signals required for the fifth generation mobile communication described above cannot be separated and parallelized. In the third embodiment, a method capable of solving such a problem is presented.

[0108]

The transmission/reception method according to the third embodiment is a method for transmitting and receiving data between a transmission device with a plurality of (N) transmission antennas and a reception device with one or more reception antennas. Here, the transmission apparatus has a beamforming transmission function, and includes a plurality (N) of transmission antennas, a beamforming transmission circuit, and a beam control unit. The receiving device has a beamforming reception function and includes receiving antennas and a beamforming reception circuit. This method is a method for transmitting and receiving data between a transmitting device and a receiving device using beamforming. The beamforming transmission function is a function of transmitting a beamforming group of radio waves from a group (N) of transmitting antennas based on one piece of data. The functions of the beam steering node include the function of performing propagation control to focus the beam at a desired receiving point based on a plurality of characteristics of actual propagation channels between a plurality of (N) transmit antennas and receive antennas. The beamforming reception function is a function of receiving a group of signals corresponding to one piece of data on the transmitting side from a group of radio waves of the beam received by the receiving antennas.

[0109]

This transmission/reception method includes a generating step, a creating step, a transmitting step, a receiving step, and a retrieving step which follow. the generating step is a step that generates characteristics of a plurality of propagation pseudo-channels between a plurality of (N) transmitting antennas and receiving antennas by a transmitting device or a receiving device. Further, the creation step is a step in which the transmission device creates one piece of data or one signal to be transmitted by synthesizing or aggregating each data into a plurality (for example, I + J) of parallel and independent data, which are transmission targets and at least contain the first data group (for example, I data pieces) and the second data group (for example, J data pieces) as a plurality of data groups whose types are different from each other from the plurality of (I + J) outputs (modulation output groups ). The set (I+J) of outputs, respectively, is obtained by characterizing the set (eg, I+J) of parallel and independent data by the characteristics of the set (I+J) of pseudo propagation channels. Further, the transmission step is a step in which the transmission device transmits a beamforming radio wave group from a plurality (N) of transmission antennas in which propagation characteristics are controlled to focus on a desired reception point by a beamforming transmission function on based on one piece of data or one signal to be transmitted. Further, the receiving step is a step in which a signal from a group of radio waves arriving in a beam state is received by the receiving apparatus with a beamforming receiving function including a receiving antenna. Further, the extraction step is a step in which the receiver extracts a set of data corresponding to a set of (I + J) parallel and independent data from the received signal based on the analysis of the characteristics of the set (I + J) of pseudo propagation channels corresponding to the pseudo propagation channels on the transmitting side. The set (I + J) of parallel and independent data, characterized by the characteristics of the set (I+J) of pseudo propagation channels, contains a set of data groups whose types differ from each other. Note that existing beamforming technologies can be applied to the transmit and receive phases described above. The set of data groups described above, whose types are different from each other, is a group of data in one, selected from different planes on the protocol stack, different bearers, different channels, different segments, different types of bandwidth control services, or communication with different degrees urgency, or it is a data group of a control/regulation signal and an application signal. As different types of bandwidth management services, bandwidth management or service type such as GBR (guaranteed bit rate), CBR (constant bit rate), VBR (variable bit rate), ABR (available bit rate) and UBR (unspecified bit rate) are mentioned. transmission).

[0110]

[Transmission/reception method and its system]

In FIG. 11 illustrates the configuration of a beamforming system as a transmission/reception method and a system thereof according to the third embodiment. For example, transmitting station 1 is a transmitting device such as a wireless base station, and receiving station 2 is a receiving device such as a user terminal. The transmitting station 1 includes a plurality of pseudo propagation channel characteristic devices 301, a beamforming control circuit 302, a transmit antenna assembly 303, one or more propagation channel characteristic control units 304, and a beam control unit 305, and the like. at the baseband node (whose illustration will be omitted) on the transmit side. The beamforming control function is implemented by the beamforming control circuit 302, the transmitting antenna assembly 303, and the beam control unit 305. For example, the plurality of pseudo propagation channel capability devices 301 includes a pseudo propagation channel capability device 301A and a pseudo propagation channel capability device 301B as two pseudo propagation channel capability devices. For example, the one or more distribution channel characteristic control units 304 include, as two distribution channel characteristic control nodes, a distribution channel characteristic control block 304A and a distribution channel characteristic control block 304B. The present embodiment is configured to include, but is not limited to, two pseudo propagation channel characteristic devices at a baseband node on the transmitting side at one transmitting station 1. The present embodiment may be configured to include three or more pseudo propagation channel performance devices and corresponding propagation channel performance adjustment nodes.

[0111]

The pseudo distribution channel characteristic device 301A includes a distributor 311A configured to supply data DA1, DA2, ... and DAI as a data set (I) that is a transmission target data group (e.g., the first transmission data group) and a data set ( I) the pseudo-channels PA1, PA2, ... and the propagation PAI corresponding to the data set (I). Similarly, the pseudo distribution channel characteristic device 301B includes a distributor 311B configured to supply data DB1, DB2, ... and DBJ as a data set (J) that is a transmission target data group (e.g., a second transmission data group), and a set (J) propagation pseudochannels PB1-PBJ corresponding to data set (J). Note that "I" and "J" may be the same number or may be different from each other. The signal/data D31 is input to the distributor 311A from the communication path NW31. Signal/data D32 is input to distributor 311B from communication path NW32. Communication paths NW31 and NW32 are communication paths or a network at the transmission station 1, and include optical fibers as an exemplary embodiment. Note that at least two communication paths NW31 and NW32 are provided, but the invention is not limited to this. Three or more communication paths may be connected to the pseudo distribution channel characteristic device 301 .

[0112]

The receiving station 2 includes a receiving antenna node 306, one or more pseudo propagation channel analysis/derivation devices 307, and a propagation channel characteristic control node 309 in a baseband node (whose illustration will be omitted). For example, the pseudo propagation channel analysis/derivation apparatuses 307 include a pseudo propagation channel analysis/derivation apparatus 307A and a pseudo propagation channel analysis/derivation apparatus 307B as two pseudo propagation channel analysis/derivation apparatuses. Further, the distribution channel characteristic control section 309 includes a distribution channel characteristic control block 309A and a distribution channel characteristic control section 309B as two distribution channel characteristic control nodes. The pseudo propagation channel analysis/derivation apparatus 307A includes a plurality (I) of pseudo propagation channel analysis/derivation circuits (PC1-PCI) connected to a receive antenna node 306 (receiver antenna B1) and an aggregator 312 connected thereto. The pseudo distribution channel analysis/derivation device 307B includes a plurality (J) of pseudo distribution channel analysis/derivation circuits (PD1-PDJ) and an aggregator 312B connected thereto.

[0113]

In the example illustrated in FIG. 11, about two paths/links are shown as paths/links for transmitting and receiving signal/data using beamforming. One is the first link and the other is the second link. The first communication link is a path using the communication path NW31, the pseudo propagation channel characteristics apparatus 301A, the pseudo propagation characteristics analysis/extraction apparatus 307A, and the communication path NW33. The second communication link is a path using the communication path NW32, the pseudo propagation channel characteristics apparatus 301B, the pseudo propagation characteristics analysis/extraction apparatus 307B, and the communication path NW34. In the third embodiment, multiple (two) paths are used to transmit multiple types of data (first data group and second data group) in accordance with user signal splitting and parallelization applications such as CU splitting. For example, in CU splitting, the first group of data may be used as control plane data and the second group of data may be used as user plane data.

[0114]

The transmitted data (first data D31 and second data D32) at the transmission station 1 side are respectively supplied from the communication path NW31 and the communication path NW32 to the distributor 311A and the distributor 311B, and become a plurality of groups of parallel and independent data due to distribution. For example, control plane data is supplied from communication path NW31 as first data D31, and user plane data is supplied from communication path NW32 as second data D32. The first transmission data group DA outputted from the distributor 311A based on the first data D31 is configured with a plurality (I) of data (data DA1, DA2, ... and DAI). The second transmission data group DB output from the distributor 311B based on the second data D32 is configured with a plurality (J) of data (data DB1, DB2, ... and DBJ).

[0115]

The pseudo distribution channel characteristics are respectively reflected in the first transmission data group DA (DA1-DAI) and the second transmission data group DB (DB1-DBJ) in the pseudo distribution channel characteristics devices 301A and 301B. The first transmission data group DA (DA1-DAI) is respectively characterized by transfer functions of a plurality (I) of propagation pseudo-channels PA (PA1-PAI), whose number corresponds to the number (I) of data. The second transmission data group DB (DB1-DBJ) is respectively characterized by the transfer functions of a plurality (J) of propagation pseudo-channels PB (PB1-PBJ) whose number corresponds to the number (J) of data.

[0116]

In the third embodiment, the characteristics of the plurality (eg, I + J) of the pseudo propagation channels are generated and set independently of the characteristics of the actual propagation channel P300 so that their cross-correlation is sufficiently low. The plurality (I) of propagation pseudo-channels PA is referred to as the first group, and the plurality (J) of pseudo-propagation channels PB is referred to as the second group. A plurality (I) of pseudo-delay profile models whose cross-correlation is low is set in a plurality (I) of propagation pseudo-channels PA of the first group from the propagation channel performance adjustment block 304A. Similarly, a plurality (J) of pseudo-delay profile models whose cross-correlation is low is set in the plurality of propagation pseudo-channels PB of the second group from the propagation channel characteristics control block 304B. Even when considered as the entire set (I+J) of pseudo propagation channels obtained by adding the set (I) of pseudo propagation channels PA and the set (J) of pseudo propagation channels PB, the set (I+J) of pseudo delay profile models is set such that their cross-correlation becomes low. Note that the two distribution channel characteristics adjusters 304A and 304B may be configured to be combined into one node.

[0117]

The set (I + J) of outputs, which is obtained by adding the set (I) of outputs (output signals) OA from the set of pseudo-channels PA of the distribution device 301A characteristics of the pseudo-propagation channels and the set (J) of outputs (output signals) OB from the set (J) of pseudo-channels PB distribution device 301B characteristics of pseudo distribution channels, is synthesized into one output (single output signal) D301. This synthesis can be realized with digital processing such as addition or modulation, for example. In other words, the output signal D301 is a signal in which a plurality of types (eg, two types) of data (eg, a first group of data and a second group of data) are superimposed on each other by splitting a CU or the like. Then, the output signal D301 is applied to each of the plurality (N) of beamforming circuits (circuits 3031-303N) in the beamforming control circuit 302. The beamforming control circuit 302 includes circuits 3021, 3022, .

[0118]

The beamforming control circuit 302 performs control, such as amplitude-phase adjustment, for one output signal D301 based on control from the beam control unit 305 for each antenna element of the transmitting antenna assembly 303, and accordingly supplies signals after control to the antenna elements (antenna A1-AN ). Control processes such as amplitude-phase adjustment in beamforming schemes respectively denote the functions Ψ1 - ΨN. The beam control unit 305 is a part that has a function of controlling the propagation characteristics based on the characteristics of the actual propagation channel P300 between the plurality of transmitting antennas and the receiving antenna so as to focus on a desired receiving point by beamforming. At least one of the transmitting station 1 or the receiving station 2 measures the performance of the actual propagation channel P300. The beam steering section 305 acquires the actual propagation channel P300 response measurement information (containing the frequency and phase response information) from the radio link 313, and performs arithmetic processing (pre-coding in existing technology) to smooth and focus the frequency response of the actual propagation channel P300 for beamforming control. based on measurement information. The beam control unit 305 sets each circuit in the beamforming control circuit 302 and controls it based on the arithmetic result. The beamforming control circuit 302 controls the amplitude and phase of the output signal D301 as an input in accordance with the control.

[0119]

The transmit antenna assembly 303 includes antennas A1, A2, A3, ... and AN as a plurality (N) of transmit antennas (and corresponding antenna elements) compatible with the beamforming function. The actual propagation channel P300 includes a plurality of propagation channels P51, P52, ... and P5N between a plurality (N) of antennas on the transmit side and one or more antennas on the receive side. The characteristics of the respective propagation channels are the characteristics h51, h52, ... and h5N. The radio waves corresponding to the respective propagation paths are the radio waves 21, 22, 23, 24, ... and 2N, and they are called the radio wave group 20. As a result of the beamforming control, the radio wave group 20 from the transmission antenna unit 303 forms a predetermined beam, and the main beam reaches the antenna B1 of the receiving antenna node 306 at the receiving station 2 to be focused as a receiving point.

[0120]

The receive antenna assembly 306 includes at least one antenna B1, but may include multiple antennas. One antenna B1 receives a group of radio waves 20 from multiple (N) antennas. The signal D302 received by antenna B1 is provided to a plurality of pseudo propagation channel analysis/derivation devices 307 (307A and 307B). For example, the plurality of pseudo propagation channel analysis/derivation devices 307 includes a pseudo propagation channel analysis/derivation device 307A and a pseudo propagation channel analysis/derivation device 307B as two pseudo propagation channel analysis/derivation devices. The pseudo propagation channel analysis/extraction apparatus 307A includes the extraction circuits PC1, PC2, ... and PCI as a plurality (I) of pseudo distribution channel analysis/extraction nodes PC (hereinafter also referred to as "extraction circuits"), which correspond to the number (I) data on the first link, and aggregator 312A. The pseudo propagation channel analysis/extraction apparatus 307B includes extraction chains PD1, PD2, . on the second link, and aggregator 312B. The numbers (I, J) of the extraction circuits PC and PD correspond to the numbers (I, J) of the pseudo propagation channels (corresponding models) of the data groups and the pseudo propagation channel characteristics devices 301 on the transmission side.

[0121]

A plurality (I) of pseudo-delay profile models whose cross-correlation is low are set in a plurality (I) of extraction lines PC of the pseudo propagation channel analysis/derivation apparatus 307A from the propagation channel characteristics control portion 309A. The set (I) of pseudo delay profile models is a copy that is the same as the set (I) of pseudo propagation channel characteristics (and corresponding models) used in the pseudo propagation channel characteristics device 301A at the transmission side. Similarly, a plurality (J) of pseudo-delay profile models whose cross-correlation is low is set in a plurality (J) of derivation chains PD of the pseudo propagation channel characterization/derivation apparatus 307B from the propagation channel characterization control unit 309B. The set (J) of pseudo delay profile models is a copy that is the same as the set (J) of pseudo propagation channel characteristics (and corresponding models) used in the pseudo propagation channel characteristics device 301B on the transmitting side. Even when considered as a whole, obtained by adding the pseudo propagation channel analyzers/extractors 307A and 307B, the plurality (I+J) of the pseudo delay profile models is set such that the cross-correlation becomes low. Note that the two distribution channel characteristics adjusters 309A and 309B can be combined into one.

[0122]

Each of the derivation circuits of the pseudo propagation channel analysis/derivation devices 307A and 307B performs a cross-correlation calculation between the received signal D302 and its corresponding pseudo-delay profile model. As a result, each of the extraction chains extracts data characterized by a corresponding pseudo propagation channel. For example, the extraction circuit PC1 performs an analysis and extraction process on the received signal D302 by using the first model of the plurality (I) of models, thereby extracting the data EA1. Similarly, data EA2, ... and EAI are respectively extracted from the PC2, ... and PCI extraction circuits. The group of data extracted from the plurality of PC circuits (PC1-PCI) of the extraction apparatus 307A of the analysis/extraction of characteristics of pseudo propagation channels is called the first group EA (EA1-EAI) of received data. The first received data group EA is a data group that has content corresponding to the first transmission data group DA (DA1-DAI). Similarly, the data group extracted from the set (J) of the extraction circuits PD (PD1-PDJ) of the pseudo propagation channel analysis/extraction apparatus 307B is called the second received data group EB (EB1-EBJ). The second received data group EB is a data group that has contents corresponding to the second transmission data group DB (DB1-DBJ). The first group EA (EA1-EAI) of received data from the set (I) of extraction circuits PC of the pseudo propagation channel analysis/extraction device 307A is aggregated into one received data by the aggregator 312A for connection and output to the communication path NW33. The second group EB (EB1-EBJ) of received data from the plurality (J) of extraction circuits PD of the pseudo propagation channel analysis/extraction apparatus 307B is aggregated into one received data by the aggregator 312B for connection and output to the communication path NW34.

[0123]

For example, in the case where the third embodiment is used as CU splitting, communication paths can be used as follows. For example, the communication path NW31 and the communication path NW33 described above are used as the user data link. At the receiving station 2, which is a terminal, the communication path NW33 ends at the receiving end of the user plane, the audio user plane bearer (dedicated bearer) and the video user plane bearer that accompany the 8K high quality image provision service are connected to the decoder high-quality 8K image, for example, to provide the user with a high-quality 8K image service. Further, a communication path NW32 and a communication path NW34 are used as control signal communication lines. At the receiving station 2, the communication path NW34 ends at the receiving end of the control plane of the bearer for the control plane, for example, the default bearer and the control plane such as bandwidth guarantee (GBR: guaranteed transmission rate) control, thereby performing communication control for terminal.

[0124]

The propagation channel adjusters 304 (304A and 304B) on the side of the transmitting station 1 obtain measurement information (i.e., frequency response or delay profile information) of the actual propagation channel P300 that is obtained by a plurality of channel adjusters 309 (309A and 309B). propagation at the side of the receiving station 2 via the SRS signal on the radio link 313. The radio link 313 is a communication link on which the signal is sent from the side of the receiving station 2 (for example, the user terminal) to the transmitting station 1 (for example, the base station) on the actual propagation channel P300 . However, radio link 313 is illustrated in FIG. 11 as a communication path that is deliberately separated from the actual distribution channel P300, since the downlink communication from the transmitting station 1 to the receiving station 2 is considered for the purpose of explaining the features of the third embodiment. The radio link 313 corresponds to the communication path for control between the distribution channel performance control nodes 104 and 109 that were described in the first embodiment (see FIG. 1). The radio link is used to exchange information about measuring the actual characteristics described above, or to exchange information about which model is set for each of the pseudo propagation channel characteristics devices 301 and the pseudo propagation channel characterization analysis/extraction devices 307 . In the third embodiment, the propagation channel characteristic adjustment section 304 uses a model generated independently of the characteristics of the actual propagation channel P300 (measured values) to set the pseudo propagation channels of the pseudo propagation channel characteristics devices 301 and the like.

[0125]

The beamforming control circuit 302 determines the position of the receiving station 2 in accordance with the pilot or SRS signal from the receiving station 2. The beamforming control circuit 302 provides amplitude and phase control information to a plurality (N) of beamforming circuits (circuits 3021-302N) on based on the control from the beam control unit 305 so that the main beam is focused on the receiving station 2. The propagation path characteristics adjustment units 304 (304A and 304B) store a plurality of models (pseudo delay profile models) obtained by the pseudo propagation path model generation method (to be described later), in the database as storage. For example, the pseudo propagation channel characteristics apparatus 301A refers to the models stored in the DB of the propagation channel characteristics control unit 304A to set the models in the propagation pseudo channels (PA1-PAI) accordingly. Note that the models in the DB of the propagation channel response control 304A and the models in the DB of the distribution channel response control 304B are adjusted so that the same model is not included in both of them, and the set of models obtained by their addition does not have a high mutual correlation.

[0126]

As described above, in the pseudo propagation channel characterization apparatuses 301 (301A and 301B) of the transmitting station 1, by using multiple (I, J) models for the pseudo propagation channels whose cross-correlation is low, the outputs (OA and OB) of the pseudo propagation channels that characterize the respective data (the first transmission data group DA and the second transmission data group DB) are synthesized into one output signal D301. This single output of D301 is the same as the input condition for the beamforming function, which is possible if it is a single transmitted signal. The transmitting station 1 radiates the radio wave group 20 from the plurality of (N) transmitting antennas based on the output signal D301 after controlling the propagation characteristics so as to focus on the desired receiving point by the beamforming function, and causes the radio wave group 20 to reach the antenna B1 of the receiving station 2, which intended as a receiving point. In the pseudo propagation channel analysis/extraction apparatuses 307 on the side of the receiving station 2, even with respect to such a single output signal D301, it is possible to separate and extract each data from the data set (I, J) by using the plurality (I, J) models for the pseudo propagation channels, which are the same as on the transmitting side.

[0127]

Note that in the case where the receiving station 2 is configured to have a reception diversity effect, by making the receiving antenna assembly 306 of the receiving station 2 include two or more antennas, communication reliability can be further improved easily.

[0128]

[Usage Example]

A specific use case and its technical results using the transmission/reception method and its system according to the third embodiment will be described with reference to FIG. 12. In FIG. 12 illustrates the implementation of CU splitting as an example of using the beamforming function in the transmission/reception method and its system according to the third embodiment. CU splitting by beamforming is illustrated at the top of FIG. 12, and the state of the link is illustrated at its bottom as a concept image. In FIG. 12, transmitting station 1 is a base station and receiving station 2 is a user terminal. On the side of the transmitting station 1 in the mechanism described above, a plurality of data (for example, x pieces of data Data#11-Data#1x (Data#11-Data#1x) and y pieces of data Data#21-Data#2Y (Data#21 -Data#2Y)), respectively characterized by a plurality of (x+y) pseudo propagation channels, are superimposed and synthesized into one output signal D301, and the radio wave group 20 is transmitted from the plurality of antennas A1-AN of the transmit antenna node 303 due to beamforming. Note that the amount (I, J) of data in the first transmission data group DA and the second transmission data group DB illustrated in FIG. 11 described above is not limited to plurality and may be set to one. For example, control plane data 310 may be one piece. Depending on the user application, for example, it is assumed that the number (x) of parallel data of user plane data 320 becomes greater than the number (y) of parallel data of control plane data 310.

[0129]

In the present embodiment, there are a first link and a second link as a plurality of links to be superimposed due to beamforming (in other words, virtual links). The first link is used to transmit control plane data 310 that requires medium speed, high reliability communication, and the second link is used to transmit user plane data 320 that requires ultra high speed communication. Namely, it is possible to realize CU splitting by using a plurality of pseudo propagation channels during beamforming. When a beam is seen at a certain time, the control plane data of the first link and the user plane data of the second link are superimposed on the beam. Depending on the transmission status, only one of the control plane data and user plane data may be contained at each point in time.

[0130]

In FIG. 12 illustrates an eMBB (Enhanced Mobile Broadband) service state in which a user terminal (ie, a receiving station 2) requires ultra-high speed communication of the order of Gbps as an example. For eMBB, control signals (control plane data) scattered over an OFDM frame can significantly hinder the achievement of ultra-high speed. On the other hand, control signals require communication with high reliability while maintaining an average speed. For this purpose, high layered modulation, i.e., 16-QAM, 64-QAM, or the like, is used in eMBB, and high reliability modulation, i.e., QPSK, is used for control signals. The bit rates and error rates of eMBB signals (user plane data) and control signals (control plane data) are inconsistent, and mixing them in the same frame is undesirable for both. Additionally, their paths differ from each other due to the network structure. The user plane data is connected via a switching network, that is, a network from the S-GW (Serving Gateway) of the core network, while control signals are connected via the network from the MME (Mobile Regulation Entity). Therefore, it is desirable to separate them also by radio links in the fifth generation. In the case of MIMO, when there are a large number of propagation channels, it is possible to provide different communication frames by allocating communication propagation channels, and this allows an optimal communication form to be realized for each of them. On the other hand, in the case of a conventional beamforming function, there is a condition that the same signal must be input. Therefore, it is not possible to mix or overlay different types of communication frames on the same beam.

[0131]

On the other hand, in the third embodiment, as illustrated in FIG. 12, it is clear that the state of multiple links in which different types of communication frames including control plane data 310 and user plane data 320 are mixed and superimposed on the same beam can be provided even, for example, during operation beam forming. In the third embodiment, it is possible to provide a state of the plurality of lines similar to the state during MIMO operation even during beamforming, and this allows realizing network operation based on CU splitting, as illustrated in FIG. 12, for example. At the bottom in Fig. 12 illustrates the concept of the case where, in one beamforming (radio wave group 20), medium speed, high reliability communication is performed by characterization of the control plane data 310 from the EPC backbone MME over the first communication link 331, and ultra high speed eMBB communication is performed by characterization. user plane data 320 from the S-GW over the second link 332. Note that EPC (Evolved Packet Core) is an innovative fourth-generation core network focusing on IP (Internet Protocol). The MME is a network for positioning and moving a user terminal. S-GW is a network that accesses the user's voice and data.

[0132]

Further, ensuring the state of the plurality of links during beamforming according to the third embodiment may not only affect CU splitting, but also affect the following examples of various user applications and applications. Namely, providing different types of bearers, network slicing, SRS splitting, ETWS splitting, parallel control/regulation signaling during microwave power transmission, auto operation control splitting, and the like can be mentioned as other examples of user applications. By providing different types of bearers, a plurality of different types of bearers (virtual distribution channels) can be provided. With network sharding, many different types of shards can be provided at the front of the network. When splitting the SRS signal, the SRS signal, etc. may be designed to be partitioned into specific pseudo distribution channels. By separating the ETWS, normal communications can be maintained during emergency communications, that is, during the activation of the ETWS (Earthquake and Tsunami Warning System).

[0133]

[Pseudo Delay Profile Model Generation Method]

In FIG. 13 illustrates a method for generating a plurality of pseudo-delay profile models (and corresponding pseudo propagation channel characteristics) according to a third embodiment. In the third embodiment and the fourth embodiment (to be described later), the transmitting station 1 or the receiving station 2 generates characteristics of a plurality of pseudo propagation channels independently of the characteristics of actual propagation channels between a plurality of transmit antennas and one or more receive antennas based on delay profile models set in advance. In plots (a), (b), (c) and (d) in FIG. 13 respectively illustrate four models whose cross-correlation is low, which are called the first model to the fourth model for explanation. The horizontal axis of the graph indicates time (t), which has positive and negative values, and the vertical axis of the graph indicates amplitude. The function illustrated in FIG. 13 is an example of an envelope used to generate pseudo-delay profiles according to the third embodiment. In each case, the amplitude is based on unity, and the parts indicated by solid lines form the delay waves. Functions that follow this principle are functions, each of which is axisymmetric to an arbitrary origin, and are a set of functions that are orthogonal to each other, that is, they are independent functions. A set of features can be used as a set of characteristics of pseudo propagation channels (and corresponding models). This is because the beamforming function forces the characteristics of the propagation paths in real propagation space to be uniquely in a near-ideal conductor state, making the constraints imposed on pseudo-delay profiles almost irrelevant.

[0134]

The first model of the graph (a) illustrates a group of delay waves, each of which has a constant amplitude in the range up to time t0. Its envelope is y = 1, and the amplitude of each of the waves 1211, 1212 delays, etc. is constant and equal to 1. The second model of the graph (b) illustrates a group of delay waves in which the reciprocal of the exponential function is the envelope (y = a - |x|). Wave amplitudes 1221, 1222 delays, etc. decrease in each of the positive and negative directions. The third plot model (c) illustrates a group of delay waves in which the absolute values of the hyperbola, excluding the origin, represent the envelope (y = |1/t|). The fourth plot model (d) illustrates a group of delay waves in which the absolute values of the sine wave represent the envelope (y=|sint|).

[0135]

In the example illustrated in FIG. 13, the time interval K of the delay wave group is constant, but in the frequency response, in this case, the time interval K becomes the sampling time, and the electrical power is concentrated in a specific frequency band. In the case where the bandwidth is large, it is necessary to arrange the group of delay waves at unequal intervals.

[0136]

Similarly in FIG. 14 illustrates the case where the time intervals of the delay waves are made unequal by lengthening the time intervals in proportion to the time t with respect to FIG. 13. The functions of the respective models are the same as those of the models in FIG. 13. With t = 0 as a reference, the delay time of each delay wave is indicated by "T = at" (a is a factor). For example, the delay time of the delay wave w1 is T1, and the delay time of the delay wave w2 is T2. The time interval from the reference to the delay wave w1 is k1, and the time interval from the delay wave w1 to the delay wave w2 is k2 (k1 < k2).

[0137]

In addition, in FIG. 15 similarly illustrates the case where the positions of the delay waves are not aligned with each other on the time axis. Plot (a) in FIG. 15 coincides with plot (a) in FIG. 14. Plots (b), (c) and (d) in FIG. 15 respectively differ from plots (b), (c) and (d) in FIG. 14 in the positions of the delay waves on the time axis.

[0138]

The cross-correlation of the example group of models illustrated in FIG. 14 is lower than in the case of the group of models illustrated in FIG. 13. Moreover, the cross-correlation of the example in FIG. 15 can be significantly reduced from the example in FIG. 14. However, since the upper limit of the frequency band is controlled by the portion having the shortest time interval, a limit is provided.

[0139]

Each of the distribution channel control blocks 304 illustrated in FIG. 11 confirms the cross-correlation between any two models of the plurality of pseudo-delay profile models, and subjects each of the models to a Fourier transform to confirm that it can be placed within a predetermined bandwidth. In the case of a model that does not satisfy such a predetermined condition, the corresponding propagation channel characteristic adjuster 304 discards the model and replaces it with a model modified to satisfy the predetermined condition.

[0140]

With the operations described above, it is possible to generate a plurality of pseudo-delay profile models whose cross-correlation is low. As a result, the type and number of the plurality of pseudo-delay profile models required by the respective pseudo propagation channels of the pseudo propagation channel characteristics devices 301 and the pseudo propagation channel characterization analysis/extraction devices 307 illustrated in FIG. 11, can be easily satisfied. However, the number is not infinite and has an upper limit.

[0141]

[Upper Limit on Number of Pseudo Delay Profile Models]

An upper limit on the number of pseudo-delay profile models will be described. An upper limit on the number of pseudo-delay profile models is determined by the condition that the duration of each pseudo-delay profile sufficiently falls within the OFDM time interval, ie the cyclic prefix (CP). On the other hand, the minimum delay wave interval time for setting the delay waves is determined by the FFT time resolution.

[0142]

In FIG. 16 illustrates an OFDM frame structure in fourth generation mobile communication, which is the basis of fifth generation mobile communication, and in particular, illustrates a CP (in other words, guard interval) for accommodating delay waves. The frame structure in Fig. 16 corresponds to a frame in the case of the LTE FDD method. In FIG. 16, frame 1510 is an OFDMA frame. Frame 1511 is an OFDMA frame preceding frame 1510, and frame 1512 is an OFDMA frame following frame 1510. CP 1513 is a CP interval for placing a delay wave between the preceding frame 1511 and frame 1510, and CP 1514 is a CP interval for placing a delay wave between frame 1510 and subsequent frame 1512. Cycle (t _t ) 1517 is an OFDMA frame repetition period and consists of a CP period (t _cp ) 1516 and a frame period (t _s ) 1515 .

[0143]

As described above, CPs 1513 and 1514 are considered such that a group of delay waves arriving late relative to the main wave can be jointly integrated with FFT. In the case of LTE standards, the 5 MHz OFDM parameters are the values shown in Table 1. The transmission bandwidth is 5 MHz, the occupied bandwidth is 3.84 MHz, the subframe time interval is 0.5 ms, the subcarrier frequency interval is 15 kHz, the sampling rate is 15.36 MHz, and the FFT size is 512. The frequency resolution as an OFDMA system consists of 3.84 MHz of occupied bandwidth and the FFT size is 512 to resolve this, i.e. 15 kHz. 0.1302 µs, obtained by converting this to the "1/15 kHz ÷ 512" time domain, is the time resolution. In the case where the CP interval is 4.69 µs, the number of points on the time axis that can be recognized by the time resolution becomes 36. Note that resampling is performed 4 times in order to measure the phase, and the number of points (described as the number of sampling points in the standard specification) is thus set to 144. However, from a frequency measurement point of view, the number of 15 kHz subcarriers does not exceed 36 points. In the case where the number of waves of the delay profile of the pseudo propagation channel model required by the present invention is 6, for example, the number of combinations in which, of these 36 points on the time axis, the first point is constant, and the remaining 5 points are selected from 35 points, for example, becomes the number of models of pseudo-propagation channels. As a result, the number of pseudo propagation channel models is 38955840, obtained by the formula "n = ₃₅ P ₅ = 35 × 34 × 33 × 32 × 31" according to the permutation calculation method. Even if models having a partial sequence and models having a high partial correlation are removed from this and the number of available models is reduced to 1/100, about 400,000 models can be obtained. Moreover, by setting the number of waves other than 6, it becomes possible to further increase the number of patterns. Based on the foregoing, according to the present method, it is obvious that a sufficiently large number of pseudo propagation channel models can be provided.

[0144]

Additionally, as this method, a method for generating models in the time domain has been described. However, by arbitrarily providing 256 points obtained by setting the number of subcarriers to be arranged in a frequency based on the number of subcarriers in the frequency domain by 1/2 of 512 points, for example, it is possible to set them in frequency domain models. It can be set to 1/3 or 1/4 instead of 1/2. However, pseudo-frequency selective fading is generated and the transmission efficiency is thus reduced. In this case, it also becomes "n = ₅₁₂ P ₂₅₆ " due to the permutation, resulting in a significant number of models. However, in this case they are converted to time domain models, and models in which the length of the delay profile is within CP and the cross-correlation between models is low should be chosen for practical use.

[0145]

By using the position information of a plurality of points as described above, a particular pseudo-delay profile model can be represented. When information about characteristics of pseudo propagation channels is exchanged between the transmitting station 1 and the receiving station 2, the method of describing it in CSI (Channel State Information: Propagation Channel State Information) or the method of providing the index again for this purpose and declaring it in advance may be used. For example, the transmitting station 1 may extend the CSI to describe the pseudo propagation channel characteristics information (i.e., the information representing the corresponding model) used for the data to be transmitted (and corresponding frames) in the CSI and notify the receiving station 2 of this. The receiving station 2 refers to the CSI pseudo propagation channel characteristics information described above from the received signal, whereby a model to be used in the analysis can be obtained.

[0146]

[Technical results, etc. (3)]

As described above, in the third embodiment, even in the case where the MIMO function cannot be provided for the beamforming function to operate, it is possible to transmit a plurality of data almost simultaneously by using characteristics of the pseudo propagation channels to increase the transmission rate. According to the third embodiment, it is possible to provide means for multiplying information transmission using characteristics of pseudo propagation channels at a base band node at a transmitter station, that is, it is possible to implement a pseudo MIMO function during beamforming. As a result, even when the MIMO system performs the beamforming function, it is useful to increase the transmission rate instead of decreasing the transmission rate by unifying transmission information for beamforming. Further, according to the third embodiment, as described above, multiple kinds of data can be mixed with a beam and transmitted, and various applications such as CU splitting can be realized.

[0147]

(Fourth embodiment)

The transmission/reception method and system thereof according to the fourth embodiment of the present invention will be described with reference to FIG. 17 and FIG. 18. It can be said that the fourth embodiment is a modification example of the third embodiment. In the fourth embodiment, the case where the present invention is applied in beamforming from one transmitting station to a plurality of receiving stations will be described.

[0148]

[Review]

It is believed that the multi-antenna system, which has a major role in the fifth generation mobile communication, uses the mMIMO (Massive MIMO) function for short distance users, and uses the beamforming function for far distance users. It is believed to have the role of compensating for the reduction in received electrical power at the end of a cell (wireless communication area) as the frequency used for communication acceleration increases. However, even if the radiation angle of the radio waves to form the beam is narrowed, the area of the focal region formed by the beam is sure to increase as the distance in its radial direction increases.

[0149]

The size of the focus region in beamforming will be described. The wavelength of the radio wave is λ, the interval d of the antenna elements is λ/2, and the number of antennas is n. The directivity (electric field) D(θ) of the beam of the array antenna when the array antenna is powered with the same phase and the same amplitude is usually determined by the following formula F.

[0150]

Formula F:

[0151]

The half-width of the radiation angle at which the received electric power when the number of antennas is 16 becomes 50% of the maximum value is 6.45° regardless of frequency. The arc length corresponding to half the width, when the distance l is 100 m, becomes 11.36 m, and on the horizontal plane, an elliptical area with a smaller diameter of about 11 m becomes the focal area. However, in a beamforming antenna, since the phase, delay time, and amplitude are controlled for each antenna element, the focus becomes sharper. In this regard, the half-width becomes narrower. However, since there is a trade-off with side-lobe suppression, the numerical values of the array antenna are considered to be used here. Then, in the case where it is considered that the larger diameter of the focus area becomes twice or even larger depending on the height difference of the antennas, the elliptical area becomes about 150 m ² . Since the terminal throughput target for the fifth generation is one unit per m ² , at least 150 terminals are placed in this focus area. Currently, there is one user per beam, but according to the method of the present invention, multiple users existing in the same focus can use their mobile phones by allocating a different pseudo propagation channel characteristic to each user. Additionally, the network can be partitioned, and this allows the operator and MVNO to communicate for each of the user terminals in the same beam.

[0152]

The transmission/reception method according to the fourth embodiment is a method for transmitting and receiving data between a transmission device with a plurality of (N) transmission antennas and each of a plurality of reception devices with one or more reception antennas. Here, the transmission device has a beamforming transmission function that includes a plurality of (N) transmission antennas, a beamforming transmission circuit, and a beam control unit. The receiving device has a beamforming reception function that includes one or more receiving antennas and a beamforming reception circuit. This transmission/reception method includes a generating step, a creating step, a transmitting step, a receiving step, and an extracting step. The generation step is the step of generating, by means of a transmitter or one of a plurality of receivers, characteristics of a plurality of propagation pseudo-channels between a plurality of (N) transmitting antennas and receiving antennas in the case where the plurality of receivers is included in the beam focus region from the transmitter. The creation step is a step in which one piece of data to be transmitted by the transmission device is created, where one piece of data is obtained by synthesizing a plurality (e.g., K+L) of parallel and independent data from a plurality of outputs, wherein the plurality of parallel and independent data represents is a transmission target for a plurality (e.g., two) of receivers, wherein the plurality of parallel and independent data at least comprises a first data group (e.g., K data pieces) and a second data group (e.g., L data pieces) as a set of data groups, whose types differ from each other, and the set of outputs, respectively, is obtained by characterizing the set of parallel and independent data by the characteristics of the set (K + L) of pseudo propagation channels. The transmission step is a step in which the transmission device transmits a beamforming group of radio waves from a plurality (N) of transmission antennas whose propagation characteristics are controlled by a beamforming transmission function based on one piece of data to be transmitted. The receiving step is a step in which a signal from a group of radio waves arriving in a beam state is received by a receiving device (for example, a first receiving device) by a beamforming receiving function including one or more receiving antennas. The extraction step is a step in which the receiver device (the first receiver device) extracts a set of data corresponding to the data group (for example, the first data group) for the own receiver device as the destination from the received signal based on the analysis of the characteristics of the set (for example , K) pseudo-propagation channels related to own receiver, from the characteristics of the set (K+L) of pseudo-propagation channels. The data group for the home receiver is characterized by the characteristics of the set (K) of pseudo propagation channels related to the home receiver.

[0153]

[Transmission/reception method and its system]

In FIG. 17 illustrates the configuration of a beamforming system as a transmission/reception method and a system thereof according to the fourth embodiment. In this configuration, as parts different from those in the configuration of the third embodiment (FIG. 11), there is a configuration in which a plurality of receiving stations 2 (user terminals) exist within the beam focus (or focus area 3), and a configuration in which has a degree of freedom to cause the communication path NW41 and the communication path NW42 at the transmitting station 1 to function independently. For example, transmitting station 1 is a transmission device such as a wireless base station, and receiving stations 2A and 2B are receiving devices such as user terminals. For example, receiving station 2A is called the first user terminal, and receiving station 2B is called the second user terminal. A group of receivers exists in focus (or focus region 3) by co-beamforming.

[0154]

The transmitting station 1 includes a plurality of pseudo propagation channel characteristic devices 401, a beamforming control circuit 402, a transmit antenna assembly 403, one or more propagation channel characteristic control units 404, a beam control unit 405, and the like. at the baseband node. The plurality of pseudo propagation channel capability devices 401 has a pseudo propagation channel capability device 401A and a pseudo propagation channel capability device 401B as two pseudo propagation channel capability devices, for example. The distribution channel response control units 404 include a distribution channel response control block 404A and a distribution channel response control block 404B as two distribution channel response control nodes, for example. The pseudo distribution channel characteristic device 401A is the first characteristic device and includes a network terminal device 411A configured to supply a plurality (K) of parallel and independent data DA1, DA2, ... and DAK, which is the first transmission data group DA, as the transmission target and a plurality (K) of propagation pseudo-channels PX1, PX2, ... and PXK corresponding to the amount of data. The pseudo distribution channel characteristic device 401B is the second characteristic device and includes a network terminal device 411B configured to supply a plurality (L) of parallel and independent data DB1, DB2, ... and DBL, which is the first transmission data group DB, as transmission target and a plurality (L) of propagation pseudo-channels PY1, PY2, ... and PYL corresponding to the amount of data. The network terminal 411A of the pseudo propagation capability apparatus 401A has a communication path NW41 as an input/output, and the network terminal 411B of the pseudo propagation capability apparatus 401B has a communication path NW42 as an input/output. Note that data can be output from the network terminal 411A to the communication path NW41. Note that the amounts of K and L according to the fourth embodiment are concepts different from the amounts of I and J according to the third embodiment.

[0155]

The receiving station 2A includes a receive antenna node 406A including one or more receive antennas, and one or more pseudo propagation channel analysis/derivation devices 407A at the baseband node. Additionally, the receiving station 2A also includes a distribution channel characteristics control unit 409A. The receiving station 2B includes a receive antenna assembly 406B including one or more receive antennas, and one or more pseudo propagation channel analysis/derivation devices 407B in the baseband node. Additionally, the receiving station 2B also includes a distribution channel characteristics control unit 409B. The receive antenna assembly 406A includes a receive antenna B1A, for example. The receive antenna node 406B includes a receive antenna B1B, for example. The pseudo propagation channel characterization/derivation apparatus 407A is a first derivation apparatus, and includes derivation circuits PU1, PU2, ... and derivation PUKs as a plurality (K) of pseudo propagation channel characterization analysis/derivation units (derivation PU circuits) corresponding to the first characterization device PUs. on the transmitting side. The pseudo propagation channel characterization/derivation device 407B is a second derivation device and includes the derivation chains PV1, PV2, . on the transmitting side.

[0156]

In FIG. 17, on the side of the transmission station 17, the data to be transmitted is respectively supplied from the communication path NW41 and the communication path NW42 to the network terminal 411A of the pseudo propagation capability apparatus 401A and the network terminal 411B of the pseudo propagation capability apparatus 401B. The network terminal 411A receives a plurality (K) of parallel and independent data DA1-DAK from the data D41 inputted from the communication path NW41 as the first transmission data group DA. The network terminal 411B receives a plurality (L) of parallel and independent data DB1-DBL from the data D42 inputted from the communication path NW42 as the second transmission data group DB.

[0157]

A plurality of pseudo-delay profile models whose cross-correlation is low are set from the distribution channel response control section 404A in the pseudo-channel response set (K) PX (PX1-PXK) of the distribution device 401A of the pseudo propagation channel response as separate models. Similarly, a plurality of pseudo-delay profile models whose cross-correlation is low are set from the propagation channel response control block 404B in the pseudo-channel response set (L) PY (PY1-PYL) of the propagation device 401B of the pseudo propagation channel response as separate models. Even in all pseudo propagation channels PX and propagation pseudo channels PY, a plurality of models whose cross-correlation is sufficiently low are set as characteristics of the plurality of propagation pseudo channels.

[0158]

The first transmission data group DA in the pseudo distribution channel characteristic apparatus 401A is respectively characterized by transfer functions that a plurality of (K) propagation pseudo channels PX (PX1 to PXK) have corresponding to the amount of data, whereby the first transmission data group DA becomes outputs (output signals) OX . For example, the propagation pseudochannel PX1 causes the first model to act on data DA1. Similarly, the second transmission data group DB in the pseudo propagation characteristics apparatus 401B is respectively characterized by transfer functions that a plurality of (L) propagation pseudo channels PY (PY1-PYL) have corresponding to the amount of data, whereby the second transmission data group DB becomes outputs (output signals) OY. The pseudo propagation channel characteristic devices 401 (401A and 401B) synthesize a plurality (K, L) of outputs OX and OY into one output (output signal) D401. One output signal is fed into the beamforming control circuit 402.

[0159]

As in the third embodiment, the beamforming control circuit 402 causes the beamforming circuits 4021, 4022, ... and 402N, which are beamforming circuits, to perform controls such as amplitude-phase adjustment (Ψ1-ΨN function processes) to one output signal D401 based on the control from the beam steering section 405 so as to correspond to the respective antenna elements (A1-AN) of the transmit antenna section 403, and supplies the respective signals after the control to the antenna elements (A1-AN).

[0160]

The transmit antenna node 403 has a configuration similar to that of the third embodiment. The transmission station 1 transmits the beamforming radio wave group 20 from the transmission antenna assembly 403 based on the single output signal D401 with the beamforming transmission function including the transmission antenna assembly 403 as a result of the beamforming control. The main beam of the group of radio waves 20 forms the focus 3 (or focus area 3) corresponding to the receiving point on the receiving side. The main beam reaches antenna B1A from receive antenna node 406A at receive station 2A located at focus 3 and antenna B1B from receive antenna node 406B at receive station 2B located at focus 3 and focuses on them. Note that in Fig. 17 specifically illustrates the state when the radio wave group 20 is focused on the antenna B1A at the receiving station 2A as the focus 3, but the antenna B1B at the receiving station 2B is turned on at the focus 3 at the same time. In the present embodiment, two user terminals (2A, 2B) exist in the spatial area corresponding to focus 3. However, the present invention is not limited to this, three or more user terminals may exist in it.

[0161]

The receiving antenna assembly 406 of each of the receiving stations 2 has a configuration similar to that of the third embodiment. The receiving station 2A receives the signal D402A from the radio wave group 20 with a beamforming reception function including a receiving antenna assembly 406A. The receiving station 2B receives the signal D402B from the radio wave group 20 with a beamforming reception function including a receiving antenna assembly 406B. The signal D402A from the antenna B1A is input to the extraction circuits PU (PU1-PUK) as a plurality (K) of pseudo propagation channel analysis/derivation units of the pseudo propagation channel analysis/derivation apparatus 407A. The signal D402B from the antenna B1B is input to the extraction circuits PV (PV1-PVL) as a plurality (L) of pseudo propagation channel analysis/extraction units of the pseudo propagation channel analysis/derivation device 407B. The number (K and L) of extraction circuits on the receiving side corresponds to the amount of data and the number of pseudo propagation channels on the transmitting side. The number of K and the number of L may be the same with each other or may be different from each other.

[0162]

A set (K) of pseudo-delay profile models, which are the same copies as the characteristics of the set (K) of pseudo propagation channels used by the pseudo propagation channel characteristics device 401A on the transmission side, is set from the propagation channel characteristics control unit 409A in the extraction multiple PU circuits of the device 407A analysis/extraction of characteristics of propagation pseudo-channels. A set (L) of pseudo-delay profile models, which are the same copies as the characteristics of the set (L) of pseudo propagation channels used by the pseudo propagation channel characteristics device 401D on the transmitting side, is set from the propagation channel characteristics control block 409B in the set of extraction circuits PV of the device 407B analysis/extraction of characteristics of propagation pseudo-channels.

[0163]

Each of the extraction circuits PU (PU1-PUK) of the pseudo propagation channel analysis/derivation apparatus 407A performs cross-correlation calculation between the received signal D402A and the corresponding one of the plurality (K) pseudo delay profile models, thereby extracting data characterized by the pseudo propagation channel characteristic. For example, the extraction circuit PU1 extracts data EA1 from the received signal D402A by analyzing using the first model. As a result, the extraction circuits PU respectively obtain a first received data group EA (data EA1, EA2, ... and EAK) which has content corresponding to the first transmission data group EA. Similarly, each of the extraction circuits PV (PV1-PVL) of the pseudo propagation channel analysis/extraction apparatus 407B performs cross-correlation calculation between the received signal D402B and the corresponding one of the plurality (L) pseudo delay profile models, thereby extracting data characterized by the pseudo propagation channel characteristic. As a result, the extraction circuits PV (PV1-PVL) respectively obtain a second received data group EB (data EB1, EB2, ... and EBL) which has a content corresponding to the second transmission data group DB.

[0164]

The beam control unit 405 of the transmitting station 1 side obtains the measurement information (i.e., information on frequency response or delay profiles) of the characteristics of the actual propagation channel P400 over the radio link 413. The measurement information is obtained by at least one of the control units 409 (409A, 409B). distribution channels on the side of the receiving station 2 using the SRS signal. As in the third embodiment, this radio link 413 is a link on which signals are transmitted from the receiving station 2 side to the transmitting station 1 side over the actual propagation channel P400, but it is intentionally illustrated separately from the actual propagation channel P400. The beam control unit 405 controls the beamforming control circuit 402 based on the characteristics of the actual propagation channel P400. The beamforming control circuit 402 determines the positions of the receiving stations 2, which are communication targets, using the pilot or SRS signal from the receiving stations 2 (2A, 2B), which are communication targets. Beamforming control circuit 402 provides amplitude and phase control information to a plurality (N) of beamforming circuits (circuit 4021-402N) so that the main beam is focused on receiving station 2 (e.g., two of receiving station 2A and receiving station 2B, which represent the purpose of the link).

[0165]

As in the third embodiment, the propagation channel characteristics adjusters 404 (404A, 404B) store a plurality of pseudo delay profile models obtained by the pseudo propagation channel model generation method in a DB as storage. For example, the pseudo propagation channel characteristics apparatus 401A refers to the model in the database of the distribution channel characteristics adjusting units 404A to set the models in the propagation pseudo channels PX accordingly. The models in the DB of the channel characteristics control block 404A and the models in the DB of the channel characteristics control block 404B are adjusted so that they do not overlap with each other or have a high cross-correlation.

[0166]

As described above, transmitting station 1 individually characterizes individual data (DA1-DAK, DB1-DBL) for multiple (e.g., two) receiving stations 2 with pseudo-propagation channels using multiple (K+L) models whose cross-correlation is low. , in the devices 401 (401A and 401B) of the characteristics of pseudo propagation channels and obtains one output signal D401 by synthesizing them. One output of D401 is the same as the input condition of the beamforming function. The transmitting station 1 radiates the radio wave group 20 from the plurality of transmitting antennas with a beamforming function based on the output signal D401. In the fourth embodiment, since the two communication links can be beamed at this time, for example, it is possible to mix two transmission data groups (DA, DB) corresponding to the receiving station 2A and the receiving station 2B as two transmission targets (places destination) at the same time. The focus of the beams reaches the antenna B1A of the receiving station 2A, which represents one destination, and also reaches the antenna of the receiving station 2B, which represents another destination. The receiving station 2A can separate and extract a set (K) of data for its own receiving station 2A as a destination from such beams in the pseudo propagation channel analysis/derivation apparatus 407A by using a set (K) of models that are the same as those of the transmitting station. side, to obtain the first group EA of the received data. Similarly, the receiving station 2B can separate and extract a set (L) of data for its own receiving station 2B as a destination from the same beam in the pseudo propagation channel analyzers/derivers 407B by using a set (L) of models that are different from the models at the receiving station. 2A to obtain a second group EB of received data.

[0167]

In the fourth embodiment, in the case where the transmitting station 1 side refers to the models of the set (for example, K+L) of pseudo propagation channel characteristics in all devices 401 (401A and 401B) of the characteristics of pseudo propagation channels, each receiving station 2 of the set (for example, two) of receiving stations 2 can access fewer models than the models on the transmit side in the pseudo propagation channel analysis/derivation device 407 (407A and 407B). For example, the receiving station 2A refers to the set (K) of models related to its own receiving station 2A. For example, the receiving station 2A performs beamforming analysis from the received signal in the pseudo propagation channel analysis/derivation device 407A using a set (K) of models related to its own receiving station 2A, and extracts a group (EA) of data for the own receiving device from the set (K + L) of data carried in the received signal. The receiving station 2A does not have the set (L) of models related to the other receiving station 2B and does not retrieve the data group (EB) for the other receiving station 2B as a destination. The same will happen when viewed from the point of view of the receiving station 2B.

[0168]

Note that in the case where the receiving station 2 side generates the pseudo propagation channel characteristics models during communication with the plurality of receiving stations 2 as described above, one arbitrary receiving station 2 of the plurality of receiving stations 2 included in the beam focus area 3 can generate them. .

[0169]

Further, as in the third embodiment, in the case where the receiving stations 2 (2A, 2B) are configured to provide a reception diversity effect by setting the number of antennas in each of the receiving stations 2 (2A, 2B) to two or more, communication reliability can be further improved with ease.

[0170]

[Usage example]

A specific use case using the transmission/reception method and its system according to the fourth embodiment and its technical results will be described with reference to FIG. 18. In FIG. 18 illustrates the implementation of a multi-user communication (in other words, a multiple access method) during beamforming as an example of using the beamforming function in the transmission/reception method and its system according to the fourth embodiment. In FIG. 18 illustrates the case where the receiving stations 2A, 2B, 2C and 2D, which are four user terminals of four users (or subscribers), together exist in the focus area 3 due to the beamforming of the transmitting station 1, which is one base station. In addition, in FIG. 18 illustrates the case where the four users include a plurality of MVNO (virtual carrier) users other than the user of the main carrier A. It is assumed that the MVNO leases the network from the main carrier A, which operates this base station (transmitting station 1) to provide services. In the present embodiment, the receiving station 2A is the user terminal U1 of the main operator A, the receiving station 2B is the user terminal U2 of the operator B MVNO, the receiving station 2C is the user terminal U3 MVNO of the operator C MVNO, and the receiving station 2D represents the user terminal U4 of the operator D of the communication operator MVNO. As the transmission target data set of the transmitting station 1, for example, Data#A (Data#A) is data for the user terminal 2A as the destination from the network 461 of the main carrier A, Data#B (Data#B) is data for user terminal 2B as destination from MVNO B network 462, Data#C (Data#C) is data for user terminal 2C as destination from MVNO C network 463, and Data#D (Data# D) is data for the 2D user terminal as the destination from the network 464 of the MVNO operator D.

[0171]

In such a case, network coexistence is required such that a communication network is required to be connected to a plurality of HSSs (Home Subscriber Server). According to the fourth embodiment, it is possible to provide a beamforming function capable of connecting a plurality of different communication networks to a plurality of user terminals at the same time, and this enables the use case illustrated in FIG. 18, for example. On the bottom in Fig. 18 is an illustration of the concept that a plurality of communication links (431-434) corresponding to multiple access to a plurality of user terminals in beamforming is mixed.

[0172]

As a use form similar to the above, one can refer to the primary communication processing in fifth generation mobile communication, that is, the separation of the ATTACH processing, in which the random association of a PBCH (Physical Broadcast Channel) reception and a corresponding PRACH (Physical Random Access Channel) transmission, which are performed by the user who turned on the power of the mobile terminal does not affect the communication speed of other users for whom communication has been established. With the beamforming described above, it is possible to provide an independent link for separating the PBCH signal for the downlink essential for ATTACH processing and the PRACH signal for the corresponding uplink from other users, and it also becomes possible to provide a communication frame for efficient ATTACH on this independent line.

[0173]

Note that the configuration at the time of beamforming transmission from the transmitting station 1 to the receiving station 2 has been described in the third embodiment and the fourth embodiment. However, beamforming is a technology for directivity control of antennas, and there is no distinction between transmission and reception. Additionally, even in the case where the radio waves travel through the propagation channel in the opposite direction, the radio waves act in the same manner as the characteristics of the propagation channels. From this, it is clear that similar technical results can be obtained even in the configuration in which the transmitting side and the receiving side are reversed in the third embodiment and the fourth embodiment (for example, configurations for transmitting data from a user terminal to a base station).

[0174]

[Technical results and the like. (4)]

As described above, according to the fourth embodiment, multiple types of data in a beam can be mixed and transmitted, and various kinds of applications such as multi-user communication can thus be realized. According to the fourth embodiment, the limitation of the beamforming focus area and the multi-user environment can be eliminated. In conventional beamforming, there is a focus area 3 reduction limit, and it is difficult to focus on one receiving station in an environment where users gather in high density. On the other hand, according to the fourth embodiment, it becomes possible to access a plurality of receiving stations 2 within the focus area 3 at the same time. For example, the transmitting station 1 (propagation channel characteristic control units 404) prepares a plurality of models in advance according to the number of receiving stations that are assumed to exist within the focus area 3 at the same time, and sets a different model for each of the receiving stations 2 (channel characteristic control nodes 409 distribution channels). This allows for multiple access as described above.

[0175]

In the third embodiment and the fourth embodiment, the concept of transmission using characteristics of multiple pseudo propagation channels is reapplied in the conventional beamforming function that assumes a single link state to realize a multiple link state. As described above, this makes it possible to realize various applications such as improvement of the network function, such as CU splitting according to the third embodiment and the new multiple access method according to the fourth embodiment, and their significant technical results. Further, in the third and fourth embodiments, for example, with respect to the beamforming transmission function parts (302, 303, 305) and the beamforming reception function parts (306, 307) illustrated in FIG. 11, there is also the advantage of using existing beamforming technology as is.

[0176]

In the traditional beamforming function, there is a limit to the input and transmission of the same data. On the other hand, in the third and fourth embodiments, by reapplying the concept of characteristics of multiple pseudo propagation channels, it is possible to realize simultaneous parallel transmission of multiple data by beamforming, in other words, the state of multiple links. Conventional mMIMO (Massive MIMO) is a way of thinking of a person skilled in the art for using MIMO and beamforming properly according to user applications or the like. and is a way of thinking for using MIMO in the case where multiple propagation channels are required, or using beamforming in the case where transmission to a particular terminal is required. On the other hand, in the third and fourth embodiments, a new problem is found in that beamforming is a single propagation path, and multiple links and separate parallelization within beamforming are implemented as described above.

[0177]

Further, in the third and fourth embodiments, the characteristics of the plurality of pseudo propagation channels to be used may be a plurality of models generated independently of the characteristics of the actual propagation channels, and it is not necessary to use the measured values of the characteristics of the actual propagation channels with respect to the plurality of models. The inventor of the present invention has focused on the frequency selective fading element reducing the real propagation channel function resulting from the beamforming function control circuit, and in the third and fourth embodiments, a method has been described for generating pseudo propagation channel characteristics that do not require the characteristics of real propagation channels. This generation method almost makes the best use of the information entropy that the physical space formed by the allowable frequency domain and the allowable time domain has, and generates a plurality of arbitrary propagation pseudo-channel models (as a specific example of delay profile models with time as a parameter) whose cross-correlation is low enough. In the conventional beamforming function, in order for the beam to be focused on the receiving point, the transmitting station side performs amplitude-phase control based on the characteristics of the actual propagation channels, so that the frequency response of the propagation channels becomes good. In the propagation channel characteristics measured by the receiving station side after this control, the frequency response is flat, and as a characteristic it is weak. Therefore, it is not suitable for generating characteristics of pseudo propagation channels. For this reason, in the third and fourth embodiments, models generated independently of the characteristics of the actual propagation channels are used as characteristics of the pseudo propagation channels.

[0178]

[Modification Example - Proper Use of Models]

The following is also possible as a modification example of the third embodiment and the fourth embodiment. The transmission target data described above has the first data (eg, the first transmission data group) and the second data (eg, the second transmission data group) as at least two kinds of data in terms of different data types in terms of required speed and reliability. The transmitting station 1 and the receiving station 2 perform control to use the first group of the plurality of pseudo propagation channels from among the characteristics of the plurality of pseudo propagation channels when a beam is transmitted and received for the first link to transmit the first data, and to use the second group of the other plurality of pseudo propagation channels for the second link for transmission of the second data. As described above (FIG. 13 and the like), a plurality of models may have a high or low degree of cross-correlation between models. In this example, characteristic modifications of a plurality of pseudo propagation channels (and a plurality of corresponding models) are classified into a first group and a second group whose cross-correlation is higher than that of the first group according to the degree of cross-correlation, for example. In the case where the first data is a data type (for example, control plane data) that requires higher reliability than the second data, the transmitting station 1 and the receiving station 2 perform control to assign the first group to the first data and assign the second group to the second data. As a result, the transmission of the first data may be more reliable than the transmission of the second data.

[0179]

(Example of modification - main control)

As another modification example of the third embodiment and the fourth embodiment, the following is further possible. In FIG. 19 illustrates the configuration of the modification example, but the illustration of the receiving station 2 will be omitted. The transmitting station 1 and the receiving station 2 may perform setup and control such as switching and assignment so as to use multiple links during beamforming according to the user application (for example, CU splitting or multiple access communication described above) with with the help of the headquarters. In other words, universally configured circuits (pseudo propagation channel characteristics device described above) can be included in the transmitting station 1 and receiving station 2 so that the circuits can be used for various kinds of user applications, and the link or model described above can be set in circuits according to the user's application using top-level control. The master control may be upper-level control at the transmitting station 1, for example, a processor such as a CPU or dedicated circuit inside or outside the base band node, for example, or may be control from a device such as another base station outside the transmitting station 1.

[0180]

In the configuration example illustrated in FIG. 19, the pseudo distribution channel characteristic device 501 includes a universal distributor 511 and a plurality (X) of universal distribution pseudo channels (P1-PX) so that it can be used for general purposes, in other words, it can be used for a plurality of user applications. One or more communication paths, for example, one optical fiber communication path NW50 is connected to the distributor 511. The communication path NW50 is a communication path capable of transmitting a plurality of data in parallel or a plurality of times. The main control unit 500 performs setting or control for the communication path NW50, the distributor 511 and the pseudo propagation channel characteristic control unit 504 according to the classification (or group) of the transmission data group depending on the intended user application. The distributor 511 distributes the input data from the communication path NW50 to the plurality of data groups corresponding to the plurality of groups according to the control. For example, a case will be described where the input data is distributed into a G1 group (D11-D1A data) in which the data amount is A, a G2 group (D21-D2B data) in which the data amount is B, and a G3 group (D31-D1A data). D3C) in which the amount of data is C.

[0181]

In the example illustrated in FIG. 19, the base station 5A and the base station 5B, which are other external base stations (or switching stations), are wirelessly connected to the base station, which is the transmission station 1. The transmission station 1 includes a main control unit 500. As a first example, the base station 5A transmits data D501 to the transmission station 1 via wireless communication. Based on the data D501 received from the base station 5A, the main control unit 500 of the transmitting station 1 performs data transmission by splitting the CU described in the third embodiment, for example, for the receiving station 2 by using the beamforming function. At this time, as described above, the main control unit 500 performs setup and control for a plurality (X) of propagation pseudo-channels (P1-PX) so that the first link and the second link to be superimposed on the beams are used. Specifically, the main control section 500 controls the pseudo propagation channel characteristic control section 504 with a control signal to respectively set the model set (A) for control plane data in the pseudo propagation channels A of group G1 and to set the model set (B) for user plane data in the pseudo propagation channels B accordingly. another group G2, for example. Then, based on the data D501, the main control unit 500 transmits the control plane data and the user plane data via the communication path NW50 to control the allocator 511 to distribute the data to the respective groups of pseudo distribution channels. As a result, similar to the mechanism described above, the control plane data of the first link and the user plane data of the second link can be mixed and transmitted from the transmitting station 1 to the beams (wave group 20). In the case where user applications are changed, for example, in the case where multi-access communication is performed, the main control unit 500 performs control in the same manner as described above, so as to switch the settings for the plurality of pseudo distribution channels of the pseudo distribution channel characteristics apparatus 501 .

[0182]

The second example looks like this. Base station 5A is a narrow field of view base station, and base station 5B is a wide field of view base station (or switching station). The base station 5A transmits the control plane data as D501 data to the transmission station 1. The base station 5B transmits the control plane data as D502 data to the transmission station 1. The transmission station 1 performs control so as to transmit D501 data from the base station 5A along the first path to the communication path NW50 to use the first communication link in the beams, and performs such control to transmit data D502 from the base station 5B via the second communication path to the communication path NW50 to use the second communication link in the beams. Similarly, during the multiple access communication described in the fourth embodiment, similar control can also be performed in the case that the base station 5A transmits data D501 for the user of the first carrier to the transmission station 1, and the base station 5B transmits data D502 for the user the second telecom operator to the transmitting station 1.

[0183]

The transmitting station 1 includes a plurality (X) of pseudo propagation channels in the form of generic circuits related to the pseudo propagation channel characteristics apparatus 501 . Depending on the user application, the data amount of a transmission data group (a plurality of parallel and independent data) may vary (for example, the data amount of the respective groups is A, B, and C). Therefore, the main control unit 500 determines the amount of data to be used according to the user application, and performs setting such as assignment to universal circuits. For example, during the first user application for the pseudo distribution channels "X", the first group G1 and the first link are established for transmitting A fragments of the first type of data, and the second group G2 and the second link are established for transmitting B fragments of the second type of data. Further, during the second user application, the amount of data (A, B) described above is changed, a plurality of groups and a plurality of links are set for the pseudo distribution channels "X". Moreover, in the case where the number (X) of parallel distribution pseudo-channels is large, they can be used for two or more user applications at the same time. Additionally, similarly to the above, the receiving station 2 may include a corresponding master control node. The main control node at the receiving station 2 controls a plurality of pseudo propagation channel analysis/extraction devices 307 and the like illustrated in FIG. 11, according to user application, for example. The main control node performs such control to receive control plane data as data D33 from the communication path NW33, receive user plane data as data D34 from the communication path NW34, and transmit the corresponding received data to a predetermined destination, for example.

[0184]

[Addition - pseudo distribution channel]

In FIG. 20 illustrates an exemplary embodiment of pseudo distribution channels in the pseudo distribution channel characteristics device 101 illustrated in FIG. 1 as a supplement for each embodiment. The pseudo propagation channels illustrated in FIG. 20 are an example of a configuration implemented with a FIR (Final Impulse Response) filter. The filter circuit, which is illustrated in Fig. 20 may be performed based on the pseudo-delay profile model information of FIG. 13 described above. In FIG. 13, the number of main wave and delay waves is 9. However, here, for explanation, the case of three waves including one main wave and two delay waves will be described. In the FIR filter circuit illustrated in FIG. 20, input D160 is multiplied by the first coefficient of input a1 in the first multiplier 1611. Additionally, input D160 is subjected to a predetermined delay in the first delay device 1601 to become the first delay signal D161. The first delay signal D161 is multiplied by the second input factor a2 in the second multiplier 1612 and delayed in the second delay device 1602 to become the second delay signal D162. The second delay signal D162 is multiplied by the third input factor a3 in the third multiplier 1613. The outputs of all the multipliers are added in the adder 1620 to become the output D163. Note that the FIR filter can be expressed as "H(z) = 1 + 1/2z + 1/4z ² " using the Z-transform. "H(z)" is a function of the propagation channel characteristics. "z" is expressed as "z = e ^jωT ". "T" represents a unit delay time. "ω" represents the angular frequency. As described above, the pseudo propagation channel can be implemented with an electronic circuit, and sufficiently high-speed processing is possible.

[0185]

[Application]

As described above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the embodiments described above, and various modifications are possible without deviating from the concept. Further, in the above description, an example has been described in which the base station side transmits the SRS signal, and the terminal side measures the characteristics of actual distribution channels. However, this mostly happens in the case of FDD. In the case of TDD, the uplink and downlink frequencies are the same. In this regard, the terminal side can transmit the SRS signal, and the base station side can receive it. This eliminates the need to provide CSI (link state information). Further, in the above description, a configuration has been adopted in which a side having a multi-antenna for the beamforming function performs transmission. However, a configuration in which a side having a multi-antenna performs reception is also possible, and the transmission/reception configuration described above can be changed.

[0186]

Additionally, the embodiments do not necessarily show all the structural provisions of an FFT or IFFT that performs frequency domain-to-time domain data transformation and time domain-to-frequency data data transformation. This is due to the fact that FFT, etc. usually often used by providing them as a specific DSP (digital signal processor) or sub-procedure on software in terms of implementation. This is also because in the TDD/TDMA method used in the wireless LAN and the like, there is an example in which both IFFT on the transmitting side and FFT on the receiving side are used.

[0187]

Note that, in the method for communicating with a plurality of networks or a plurality of terminals shown in the third embodiment or the fourth embodiment described above, a configuration in which one network and one terminal is used to increase the communication speed is also easily possible.

[0188]

Moreover, an example of wireless communication has been described in the third embodiment or the fourth embodiment. However, even in optical fiber communication having a single propagation path, a configuration is easily possible in which communication using characteristics of pseudo propagation channels in the same frequency band, that is, a wavelength band, is multiplexed. Namely, a configuration is easily possible in which the beamforming propagation channels described above are replaced by an optical fiber. Additionally, a configuration is also easily possible in which they are replaced by electrical conductor communication paths.

LIST OF REFERENCES

[0189]

1 - transmitting station (or transmission device),

2 - receiving station (or receiving device),

100, 200 - baseband node,

101 - device characteristics of pseudo distribution channels,

102 - MIMO transmission device,

103 - node transmitting antennas,

104 - node for regulating the characteristics of distribution channels,

106 - receiving antenna node,

107 - MIMO receiver,

108 - device for analyzing/extracting the characteristics of pseudo distribution channels,

109 - node for regulating the characteristics of distribution channels,

104A, 109A - real propagation channel characteristics measurement unit,

104B, 109B - pseudo distribution channel characteristics generating block,

P100 is a real distribution channel.

Claims (73)

1. A method for transmitting/receiving data between a transmission device having a plurality of transmitting antennas and a receiving device having a receiving antenna, the transmitting/receiving method including a generating step of generating, by means of a transmitting device or a receiving device, characteristics of a plurality of pseudo propagation channels based on characteristics of a plurality of actual propagation channels between a plurality of transmitting antennas and a receiving antenna, wherein the characteristics of the plurality of pseudo propagation channels are characteristics similar to frequency characteristics to the extent that what frequency response can be approximated by the characteristics of a set of real propagation channels, a transmission step in which one or more data to be transmitted is created by the transmission device by appropriately reflecting the characteristics of a plurality of propagation pseudo-channels in a plurality of parallel and independent data, and one or more data is transmitted from a plurality of transmission antennas in the form of radio waves, and a receiving stage in which a plurality of parallel and independent data is extracted by a receiver device from one or more received data received in the form of radio waves by a receiving antenna, based on the characteristics of the plurality of pseudo propagation channels, wherein the transmission device has a MIMO transmission function, the receiving device includes a plurality of receiving antennas as a receiving antenna and has a MIMO receiving function, the generating step is a step in which, by means of a transmitting device or a receiving device, characteristics of a plurality of pseudo propagation channels are generated based on characteristics of a plurality of actual propagation channels, including propagation channels along diagonal lines between a plurality of transmission antennas and a plurality of reception antennas, diagonal line propagation channels are propagation channels other than propagation channels, each of which faces directly one another between a plurality of transmit antennas and a plurality of receive antennas, the transmission step is a step in which the transmission device creates a plurality of parallel and independent data to be transmitted by appropriately reflecting the characteristics of the plurality of pseudo propagation channels in the plurality of data, and transmits the plurality of parallel and independent data from the plurality of transmission antennas in the form of radio waves by using the transmission function mimo, and the receiving step is a step in which the receiver generates a plurality of received data from signals received as radio waves by a plurality of reception antennas using a MIMO reception function, and extracts a plurality of parallel and independent data based on characteristics of the plurality of pseudo propagation channels from the plurality of received data. 2. The method of transmission / reception according to claim 1, wherein the transmitting step includes generating, by means of the transmitting device, a sum signal and a difference signal from two data to be transmitted from a plurality of parallel and independent data created using the MIMO transmission function, and transmitting the sum signal and the difference signal from two transmitting antennas from a plurality of transmitting antennas in the form of radio waves, and in the case when two data to be transmitted are SA1 and SA2, the sum signal is the signal obtained by the sum of SA1 and SA2, and the difference signal is the signal obtained by the difference between SA1 and SA2, and the receiving step includes extracting, by means of the receiving device, a sum signal and a difference signal in two received data from a plurality of received data from signals received as radio waves by two reception antennas from a plurality of reception antennas by using a MIMO reception function. 3. A method for transmitting/receiving data between a transmission device with a plurality of transmission antennas and a reception device with one or more reception antennas, the transmission device having a beamforming transmission function including a plurality of transmission antennas, the reception device having a beamforming reception function beam having one or more receiving antennas, and the method of transmission/reception includes a generation step in which the characteristics of a plurality of propagation pseudo-channels between a plurality of transmit antennas and one or more receive antennas are generated by a transmitting device or a receiving device, a creation step in which one piece of data to be transmitted is created by a transmission device, wherein one piece of data is obtained by synthesizing a plurality of parallel and independent data from a plurality of outputs, and a plurality of parallel and independent data are transmission targets, wherein the plurality of parallel and independent data at least contains the first data group and the second data group as a set of data groups whose types differ from each other, and the set of outputs, respectively, is obtained by characterizing the set of parallel and independent data by the characteristics of the set of pseudo propagation channels, a transmission step of transmitting, by the transmission device, a beamforming group of radio waves from a plurality of transmission antennas with a beamforming transmission function based on one piece of data to be transmitted; a receiving step of receiving, by means of the receiving apparatus, a signal from a group of radio waves arriving in a beam state with a beamforming receiving function including one or more receiving antennas, and an extraction step of extracting, by means of the receiver, a set of data corresponding to a set of parallel and independent data from the received signal based on the analysis of the characteristics of the set of pseudo propagation channels, wherein the set of parallel and independent data, characterized by the characteristics of the set of pseudo propagation channels, contains a set of data groups whose types are different wherein the plurality of data groups whose types differ from each other is a data group in one selected from different planes on the protocol stack, different bearers, different channels, different segments, different types of bandwidth control services, or communications with different degrees of urgency, or is a data group of a control/regulation signal and an application signal. 4. A method for transmitting/receiving data between a transmitting device and each of a plurality of receiving devices, wherein the transmitting device includes a plurality of transmitting antennas, and each of the receiving devices includes one or more receiving antennas, wherein the transmission device has a beamforming transmission function including a plurality of transmission antennas, the receiving device has a beamforming reception function including receiving antennas, moreover, in the case when a plurality of receiving devices are included in the focus area of the beam from the transmitting device, the transmission/reception method comprises a generation step in which the characteristics of a plurality of propagation pseudo-channels between a plurality of transmitting antennas and receiving antennas are generated using a transmitter or one of the plurality of receivers, a creation step in which one piece of data is created to be transmitted by a transmission device, wherein one piece of data is obtained by synthesizing a plurality of parallel and independent data from a plurality of outputs, wherein the plurality of parallel and independent data are transmission targets for a plurality of receivers, wherein the plurality parallel and independent data at least contains the first data group and the second data group as a set of data groups whose types differ from each other, and the set of outputs, respectively, is obtained by characterizing the set of parallel and independent data by the characteristics of the set of pseudo propagation channels, a transmission step of transmitting, by the transmission device, a beamforming group of radio waves from a plurality of transmission antennas with a beamforming transmission function based on one piece of data to be transmitted; a receiving step of receiving, by means of the receiving apparatus, a signal from a group of radio waves arriving in a beam state with a beamforming receiving function including one or more receiving antennas, and an extraction step of extracting, by means of the receiver, a data set corresponding to the data group for the own receiver as the destination from the received signal based on the analysis of the characteristics of the plurality of pseudo propagation channels related to the own receiver from the characteristics of the plurality of pseudo propagation channels, wherein the characteristics the sets of pseudo distribution channels related to the own receiver are reflected in the data group for the own receiver. 5. Method of transmission/reception according to any one of paragraphs. 1-4, wherein the characteristics of the plurality of pseudo propagation channels have a lower cross-correlation than the cross-correlation of the characteristics of the plurality of real propagation channels. 6. The transmission/reception method according to claim 1 or 2, wherein the characteristics of the plurality of pseudo propagation channels are characteristics that are modified by modeling portions of the characteristics using the measurement results of the characteristics of the plurality of real propagation channels and reducing cross-correlation between models. 7. The transmission/reception method according to claim 3 or 4, wherein the generating step is the step of generating, by means of a transmitting device or a receiving device, characteristics of a plurality of pseudo propagation channels based on delay profile models set in advance, regardless of the characteristics of actual propagation channels. between a plurality of transmit antennas and one or more receive antennas. 8. The transmission / reception method according to claim 7, in which the generating step is a step in which a plurality of models are generated by a transmitting device or a receiving device, in each of which, as a delay profile of a plurality of propagation pseudo-channels, the main wave is arranged symmetrically about the axis, the main wave and the plurality of delay waves are arranged at any equal time intervals, moreover, in time intervals, differences from the main wave are provided on the time axis using a function, or at essentially arbitrary time intervals, and the intensity of each wave from the main wave and the set of delay waves is regulated using the envelopes of the set of functions symmetric along the time axis. 9. Method of transmission/reception according to any one of paragraphs. 1-8, in which the property information of the plurality of pseudo propagation channels has a length that can be accommodated in the length of a guard interval interval between communication frames. 10. The transmission / reception method according to claim 3 or 4, in which the characteristics of the plurality of pseudo propagation channels are classified into a first group and a second group having a higher cross-correlation than the first group according to the degree of cross-correlation, and in which, in the case where the first data group is a data type that requires higher reliability than the second data group, it is controlled such that the first group is assigned to the first data group and the second group is assigned to the second data group. 11. A transmission/reception system for transmitting and receiving data between a transmission device with a plurality of transmitting antennas and a receiving device with a receiving antenna, wherein the transmitting device or the receiving device is configured to generate the response of the plurality of pseudo propagation channels based on the characteristics of the plurality of actual propagation channels between the plurality of transmitting antennas and the receiving antenna, wherein the characteristics of the plurality of pseudo propagation channels are characteristics similar to frequency responses to the extent that the frequency response can be approximated by the characteristics of a set of real distribution channels, the transmission device is configured to create one or more data to be transmitted by reflecting the characteristics of a plurality of propagation pseudo-channels in a plurality of parallel and independent data, and transmits one or more data from a plurality of transmission antennas in the form of radio waves, the receiving device is configured to extract a plurality of parallel and independent data from one or more received data received in the form of radio waves by the receiving antenna, based on the characteristics of the plurality of propagation pseudochannels, the transmission device has a MIMO transmission function, the receiving device includes a plurality of receiving antennas as a receiving antenna and has a MIMO receiving function, the transmitting device or the receiving device is configured to generate characteristics of a plurality of pseudo propagation channels based on the characteristics of a plurality of real propagation channels, including propagation channels along diagonal lines between a plurality of transmitting antennas and a plurality of receiving antennas, diagonal line propagation channels are propagation channels other than propagation channels, each of which faces directly one another between a plurality of transmit antennas and a plurality of receive antennas, moreover, the transmission device is configured to create a plurality of parallel and independent data to be transmitted by reflecting the characteristics of a plurality of propagation pseudo-channels in a plurality of data, and transmits a plurality of parallel and independent data from a plurality of transmitting antennas in the form of radio waves by using the MIMO transmission function, the receiving device is configured to generate a plurality of received data from signals received as radio waves by a plurality of reception antennas using a MIMO reception function, and extracts a plurality of data based on characteristics of the plurality of pseudo propagation channels from the plurality of received data. 12. The transmission / reception system according to claim 11, in which the transmission device is configured to create a sum signal and a difference signal from two data to be transmitted from a plurality of parallel and independent data created using a MIMO transmission function, and to transmit a sum signal and a difference signal from two transmission antennas from a plurality of transmission antennas in the form of radio waves , wherein, in the case where the two data to be transmitted are SA1 and SA2, the sum signal is the signal obtained by the sum of SA1 and SA2, and the difference signal is the signal obtained by the difference between SA1 and SA2, and wherein the receiving device is configured to extract the sum signal and the difference signal in the two received data from the plurality of received data from the signals received as radio waves by the two reception antennas from the plurality of reception antennas using the MIMO reception function. 13. A transmission/reception system for transmitting and receiving data between a transmission device with a plurality of transmitting antennas and a receiving device with one or more receiving antennas, wherein the transmission device has a beamforming transmission function including a plurality of transmission antennas, the receiving device has a beamforming receiving function having one or more receiving antennas, the transmitting device or the receiving device is configured to generate the characteristics of a plurality of propagation pseudo-channels between a plurality of transmitting antennas and one or more receiving antennas, the transmission device is configured to create one piece of data to be transmitted, wherein one piece of data is obtained by synthesizing a plurality of parallel and independent data from a plurality of outputs, wherein the plurality of parallel and independent data are transmission targets, wherein the plurality of parallel and independent data at least comprises the first data group and the second data group as a plurality of data groups whose types are different from each other, wherein the output plurality is respectively obtained by characterizing the plurality of parallel and independent data by the characteristics of the plurality of pseudo propagation channels, the transmission device is configured to transmit a group of radio waves forming a beam from a plurality of transmitting antennas using a beamforming transmission function based on a single piece of data to be transmitted, the receiving device is configured to receive a signal from a group of radio waves arriving in a beam state using a beamforming reception function including one or more receiving antennas, the receiving device is configured to extract a set of data corresponding to a set of parallel and independent data from the received signal based on the analysis of the characteristics of the set of pseudo propagation channels, wherein the set of parallel and independent data, characterized by the characteristics of the set of pseudo propagation channels, contains a set of data groups whose types differ from each other. friend, and a plurality of data groups whose types differ from each other is a group of data in one selected from different planes on the protocol stack, different bearers, different links, different segments, different types of bandwidth control services, or communications with different degrees of urgency, or is a data group of a control/regulation signal and an application signal. 14. A transmission/reception system for transmitting and receiving data between a transmission device with a plurality of transmitting antennas and each receiving device of a plurality of receiving devices, each of the receiving devices having one or more receiving antennas, wherein the transmission device has a beamforming transmission function including a plurality of transmission antennas, each of the receivers has a beamforming reception function including receiving antennas, and in the case when a plurality of receiving devices are included in the focus area of the beam from the transmitting device, the transmitting device or one of the plurality of receiving devices is configured to generate the characteristics of the plurality of propagation pseudo-channels between the plurality of transmitting antennas and the receiving antennas, the transmission device is configured to create one piece of data to be transmitted, wherein one piece of data is obtained by synthesizing a plurality of parallel and independent data from a plurality of outputs, wherein the plurality of parallel and independent data is the transmission target for the plurality of receivers, wherein the plurality of parallel and independent data at least contains the first data group and the second data group as a plurality of data groups whose types differ from each other, and the plurality of outputs are respectively obtained by characterizing the plurality of parallel and independent data by the characteristics of the plurality of pseudo propagation channels, the transmission device is configured to transmit a group of radio waves forming a beam from a plurality of transmitting antennas using a beamforming transmission function based on a single piece of data to be transmitted, the receiving apparatus is configured to receive a signal from a group of radio waves arriving in a beam state with a beamforming receiving function including one or more receiving antennas, and the receiving device is configured to extract the data set corresponding to the data group for the own receiving device as the destination from the received signal based on the analysis of the characteristics of the plurality of pseudo propagation channels related to the own reception device from the characteristics of the plurality of pseudo propagation channels, and the data group for the own device The reception is characterized by the characteristics of the plurality of pseudo-propagation channels related to the own receiver.

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