WO2012096101A1 - 無線通信装置 - Google Patents
無線通信装置 Download PDFInfo
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- WO2012096101A1 WO2012096101A1 PCT/JP2011/079156 JP2011079156W WO2012096101A1 WO 2012096101 A1 WO2012096101 A1 WO 2012096101A1 JP 2011079156 W JP2011079156 W JP 2011079156W WO 2012096101 A1 WO2012096101 A1 WO 2012096101A1
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- terminal
- slave
- circuit
- mimo
- master
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
Definitions
- the present invention relates to a wireless communication apparatus that transmits and receives a modulated signal using a plurality of antenna elements.
- WCDMA Wideband Code Division Multiple Access
- GSM Global System for Mobile communications
- 3GPP 3rd Generation Partnership Project
- MIMO multi-input multi-output
- MIMO communication is a communication technique in which a plurality of antenna elements are provided on both a transmitter side and a receiver side that perform wireless communication, and a data stream is spatially multiplexed and transmitted from the transmission side to the reception side.
- M and N are integers of 2 or more
- on the transmission side a plurality of transmission data streams are subjected to space / time coding and multiplexed, distributed to M transmission antennas, and transmitted to a channel.
- a plurality of data streams are separated from the received signal by performing space / time decoding on the received signal received by the N receiving antennas via the channel based on channel characteristics. This makes it possible to obtain received data without crosstalk between data streams.
- MIMO communication it is possible to obtain as many independent transmission paths as the number of transmission antennas and reception antennas, that is, the number represented by min ⁇ M, N ⁇ . . This number is called spatial multiplicity or spatial multiplexing number.
- the data series can be reliably separated because the correlation between the antenna elements is small.
- the MIMO technology transmits different data sequences from a plurality of antenna elements, and makes it possible to separate data sequences simultaneously transmitted from each antenna element on the transmission side on the receiving side provided with a plurality of antenna elements.
- This is a technique for improving the transmission capacity without expanding the frequency band.
- the transmission capacity can be expanded according to the number of antennas.
- the signal power is S and the noise power is N
- the original performance of MIMO communication can be maximized when the SN ratio (signal-to-noise ratio) is large, for example, when the noise power N is small.
- the MIMO communication system is a wireless LAN (Local Area Network) standard IEEE802.11n, a next generation mobile communication standard, 3GPP (3rd Generation Partnership Project) under development of UMTS (Universal Mobile Telecommunication System) It is used in LTE (Long Term Evolution), mobile WiMAX based on the IEEE 802.16e standard, and the like.
- 3GPP Third Generation Partnership Project
- UMTS Universal Mobile Telecommunication System
- the MIMO communication method is applied to a small device such as a mobile phone terminal, the device body is small, so a plurality of antenna elements must be mounted in close proximity, and MIMO communication is performed. It becomes difficult to lower the correlation between the antenna elements that greatly influence the original performance.
- the MIMO communication method will be described in more detail.
- the MIMO communication method will be described in the case where the number of transmission antennas is two and the number of reception antennas is two, that is, 2 ⁇ 2 MIMO is taken as an example.
- a link through which a signal is transmitted from the base station to the mobile terminal is referred to as a downlink, and a link through which a signal is transmitted from the mobile terminal to the base station is referred to as an uplink.
- channel fluctuations in these four channels that is, channel transfer functions h 11 (t), h 12 (t), h 21 (t), and h 22 (t) are estimated, whereby two transmitting antennas T ⁇
- the data series A and the data series B coming to the receiving side from ANT1 and T-ANT2 are separated.
- a pilot signal is embedded in a transmission data sequence from each transmission antenna.
- the configuration when the number of antennas on the transmitting side is T and the number of antennas on the receiving side is R is represented by “T ⁇ R”.
- 2 ⁇ 2, 4 ⁇ 2, and 4 ⁇ 4 configurations are defined as the MIMO configuration to be used in downlink data transmission. Therefore, in the LTE mobile terminal to which the MIMO technology is applied, it is necessary to install two or four antenna elements in the terminal.
- the wavelength in the free space of the frequency used for communication is ⁇
- additional space is required in the mobile terminal.
- a mobile terminal since a mobile terminal already has a plurality of antenna elements for different communication methods, it is extremely difficult to install a plurality of MIMO antenna elements on such a mobile terminal.
- a plurality of antenna elements must be installed in close proximity, and in order to prevent interference between the antenna elements and keep the correlation low, it is necessary to further increase the size of the mobile terminal. Even if the 2 ⁇ 2 MIMO communication system is applied, it is difficult to add more antenna elements to the mobile terminal in order to bring out the original performance of the MIMO communication.
- Patent Document 1 discloses that a plurality of portable terminals are used to operate them synchronously in order to enable uplink MIMO communication. Since it is only necessary to divide the stream and transmit it from different antenna elements on the transmission side, it is easy to use a plurality of portable terminals as the transmission side in MIMO communication.
- Patent Document 1 discloses a configuration necessary for performing MIMO communication using a plurality of portable terminals as a receiving side that requires complicated processing such as channel estimation and stream separation. Is not disclosed.
- An example of a communication system that realizes synchronous control of processing operations among a plurality of communication terminal apparatuses is disclosed in Japanese Patent Application Laid-Open No. 2007-140590 (Patent Document 2).
- An object of the present invention is a wireless communication apparatus using a plurality of antenna elements and utilizing the spatial diversity of a wireless channel, and there is no space for installing a plurality of built-in antennas in the apparatus or when additional built-in antenna elements are added.
- the data reception quality here includes, for example, an error rate of transmission information, an occurrence rate of communication disconnection, and the like.
- the wireless communication device of the present invention is a wireless communication device that communicates with a base station, and includes a plurality of terminals each having an antenna element and an RF circuit, and one of the plurality of terminals is a master terminal and the remaining terminals are Each slave terminal is connected to a master terminal by an interface including at least a high-frequency transmission path.
- the master terminal further includes a control unit and a MIMO processing unit, and the control unit is an RF circuit of the MIMO processing unit and the master terminal. RF signals received by the antenna elements of the master terminal and the RF signals received by the antenna elements of each slave terminal and transmitted to the master terminal via the high-frequency transmission path Based on the signal, the MIMO processing unit is caused to execute the MIMO reception process.
- the present invention it is possible to use the antenna element provided in the slave terminal when performing reception by the MIMO communication method, so that the number of spatial multiplexing can be increased, for example, improvement of transmission capacity, The quality of data communication can be improved.
- n is an integer of 2 or more, and any of the n mobile terminals owned by the user can be used for the MIMO communication system.
- the portable terminal may have a MIMO function by itself.
- one of the plurality of portable terminals is set as a master terminal, and the remaining is set as a slave terminal controlled from the master terminal, and the master terminal and the slave terminal are combined from the base station. As a whole, one MIMO terminal is configured.
- FIGS. 2A to 2C Various forms of connection between the master terminal and the slave terminal are conceivable, and examples of these forms are shown in FIGS. 2A to 2C.
- FIG. 2A shows a daisy chain connection in which slave terminals are connected in a straight line with a master terminal as one end.
- FIG. 2B shows a one-to-many connection in which each of the plurality of slave terminals is directly connected to the master terminal.
- FIG. 2C shows a connection using both daisy chain connection and one-to-many connection.
- any connection configuration can be used as long as the master terminal and the slave terminal can be connected to function as a single MIMO as a whole. Can be adopted.
- the interface between the terminals is configured to transmit a control signal for the master terminal to control each slave terminal and a high-frequency signal (RF signal) sent from each slave terminal to the master terminal.
- the RF signal is an RF signal as received by the antenna element of the slave terminal, or an RF signal obtained by subjecting the RF signal as received at the antenna element to filtering and low noise amplification at the slave terminal.
- These RF signals are transmitted from the slave terminal to the master terminal through a high-frequency transmission line such as a coaxial cable.
- the number of antennas on the receiving side is substantially increased while using the antenna elements incorporated in the slave terminals and the hardware in the slave terminals, and MIMO in each terminal is performed.
- a MIMO communication terminal having an order larger than the order of communication can be configured, and as a result, the data transmission capacity can be further increased.
- Examples of hardware in the slave terminal include a filter processing circuit and a low noise amplifier circuit.
- FIG. 3 shows an example of the configuration of the above-described wireless communication apparatus which is an embodiment of the present invention.
- the master portable terminal 10 and the slave portable terminal 40 are portable communication terminals having equivalent functions, have a 2 ⁇ 2 MIMO communication function adapted to a specific wireless communication scheme, and are adapted for MIMO communication adapted to the aforementioned wireless communication scheme.
- the master portable terminal 10 includes two antennas 17 and 18 for enabling 2 ⁇ 2 MIMO communication operation in the downlink. Similarly, the slave terminal also performs 2 ⁇ 2 MIMO communication in the downlink. Two antennas 47 and 48 are provided.
- the master mobile terminal 10 further controls the entire master mobile terminal 10 and performs processing to be described later on the slave mobile terminal 40, and a digital baseband circuit 12 that performs digital signal processing on the baseband signal.
- a digital baseband circuit 12 that performs digital signal processing on the baseband signal.
- the digital baseband circuit 12 functions as a MIMO processing unit that performs processing necessary for MIMO communication on a baseband signal.
- the CPU 11 exchanges data with an upper layer that is an application or the like, and is connected to the data bus 19 and the control bus 20.
- a digital baseband circuit 12 and an I / F circuit 21 are further connected to the data bus 19, and a digital baseband circuit 12, RF circuits 13 to 16 and an I / F circuit 21 are further connected to the control bus 20. .
- the RF circuits 13 and 14 are connected to the digital baseband circuit 12 and have a function of performing transmission / reception processing for transmitting / receiving an RF signal to / from a base station, and are connected to antennas 17 and 18, respectively.
- the RF circuits 15 and 16 have only a function of performing reception processing on the RF signal input from the slave portable terminal 40 and are also connected to the digital baseband circuit 12.
- the slave portable terminal 40 has the same configuration as the master portable terminal 10 and includes a CPU 41, a digital baseband circuit 42, RF circuits 43 to 46, a data bus 49, a control bus 50, and an I / F circuit 51. Yes.
- the CPU 41 controls the slave portable terminal 40 as a whole.
- the CPU 41 is configured to control the slave portable terminal 40 in accordance with the control from the CPU 11 of the master portable terminal 10.
- the I / F circuit 51 interfaces with the master portable terminal 10 and is connected to the I / F circuit 21 of the master portable terminal 10 through a digital signal line. Control data for controlling the slave portable terminal 40 and a data stream to be transmitted from the slave portable terminal 40 to the base station side are sent from the master portable terminal 10 to the slave portable terminal 40 via this digital signal line.
- the RF circuits 43 and 44 are connected to the digital baseband circuit 42 and have a function of performing transmission / reception processing for transmitting / receiving an RF signal to / from the base station, to which antennas 47 and 48 are connected, respectively.
- the RF circuits 45 and 46 have only a function of performing reception processing, and are also connected to the digital baseband circuit 42.
- the RF circuits 13, 14, 43, and 44 have the same circuit configuration.
- the circuit configuration will be described by using the RF circuit 13 (or 43) as a representative.
- the RF circuit 13 (43) performs reception processing on the RF signal received by the antenna 17 (47), and the baseband signal obtained as a result is digital baseband circuit 12 (42).
- RF reception processing unit 70 that outputs to the base station, and RF transmission processing that performs transmission processing based on the transmission baseband signal from the digital baseband circuit 12 (42) and generates a transmission RF signal to be transmitted from the antenna 17 (47)
- a duplexer 76 provided between the antenna 17 (47), the RF reception processing unit 70, and the RF transmission processing unit 71 in order to share the antenna for transmission and reception.
- the RF circuit 13 includes an analog switch (SW) 75 described later, and a duplexer 78 provided between the duplexer 76 and the RF reception processing unit 70.
- SW analog switch
- the RF reception processing unit 70 includes a band-pass filter (BPF) 74 that performs filtering on the RF signal input from the duplexer 76 via the duplexer 78, and a low-noise amplifier that amplifies the output signal of the band-pass filter 74 ( LNA) 73, a demultiplexer 77 connected to the output of the low noise amplifier 73, and an analog baseband signal by performing quadrature demodulation on the signal output from the low noise amplifier 73 via the demultiplexer 77 And an orthogonal demodulator 72 that performs analog / digital conversion on the analog baseband signal and outputs the analog baseband signal to the digital baseband circuit 12 as a digital baseband signal.
- BPF band-pass filter
- the analog switch 75 includes two input ports L1 and L2 and one common port COM, and is a changeover switch that selects one of the input ports L1 and L2 and outputs a signal to the selected input port to the common port COM. It is configured.
- the RF signal branched from the duplexer 76 by the branching filter 78 is supplied to the input port L1, the RF signal branched by the branching filter 77 through the low noise amplifier 73 is supplied to the input port L2, and the two supplied The RF signal is switched and output from the common port COM to the output port A provided in the RF circuit 13 (43).
- the output port A is connected to one of the coaxial connectors included in the coaxial connector group 22 (52) in order to connect to the other portable terminal that becomes the master terminal. is doing.
- the RF signal received by the antenna 17 (47) passes through the duplexer 76 and is demultiplexed by the demultiplexer 78, one at the input port L1 of the analog switch 75, and the other at the RF circuit.
- the data is supplied to the reception processing unit 70.
- the RF signal input to the RF reception processing unit 70 is subjected to filtering processing by the band pass filter 74, amplified by the low noise amplifier 73, and demultiplexed by the demultiplexer 77.
- the RF signal from one output of the demultiplexer 77 is converted into an analog baseband signal by the quadrature demodulator 72, further converted into a digital baseband signal, and output to the digital baseband circuit 12 (42).
- the RF signal from the other output of the waver 77 is supplied to the input port L2 of the analog switch 75.
- the analog switch 75 is controlled by a control signal on the control bus 20 (50), and the output of the analog switch 75 is output from the RF circuit 13 (43) via the output port A.
- the RF circuit 15 (45) includes an RF reception processing unit 90 that performs reception processing on an RF signal input from the coaxial connector included in the coaxial connector group 22 (52).
- the RF reception processing unit 90 performs a filtering process on the input RF signal, a low noise amplifier 93 that amplifies the output signal of the band pass filter 94, and a signal output from the low noise amplifier 93.
- a quadrature demodulator 92 that generates an analog baseband signal by performing quadrature demodulation and further performs analog / digital conversion on the analog baseband signal and outputs the digital baseband signal to a digital baseband circuit; I have.
- the RF signal input to the RF reception processing unit 90 is subjected to filtering processing by the band pass filter 94, amplified by the low noise amplifier 93, and converted into an analog baseband signal by the quadrature modulator 92. After being converted, it is further converted into a digital baseband signal and output to the digital baseband circuit 12 (42).
- the RF circuits 15, 16, 45, 46 having only the reception processing function are not required when 2 ⁇ 2 MIMO communication is performed using only one mobile terminal, but two mobile terminals, that is, This is necessary to perform 4 ⁇ 4 MIMO communication using the master portable terminal 10 and the slave portable terminal 40.
- RF signals from the output port A of the RF circuits 43 and 44 of the slave portable terminal 40 are input to the RF circuits 15 and 16 of the master portable terminal 10, respectively.
- the coaxial connector in the coaxial connector group 52 and the coaxial connector in the coaxial connector group 22 are connected by a coaxial cable or the like so that the RF signal can be supplied.
- the RF circuits 13 and 14 perform processing such as filtering, low noise amplification, and synchronous detection on the input RF signals received by the antennas 17 and 18.
- the outputs of the RF circuits 13 and 14 are input to the digital baseband circuit 12.
- the digital baseband circuit 12 performs processing such as estimation of each channel, separation of a spatially multiplexed signal, demodulation processing, combination of data divided for each antenna, channel decoding, and the like using a multi-antenna method.
- the output of the digital baseband circuit 12 is sent to the upper layer via the data bus 19 and the CPU 11.
- the master portable terminal 10 When performing 4 ⁇ 4 MIMO communication, only the master portable terminal 10 is known from the base station. This is achieved, for example, by only the master portable terminal 10 responding to a control signal on the control channel sent from the base station. Then, the master portable terminal 10 requests the base station to shift from the 2 ⁇ 2 MIMO communication so far to 4 ⁇ 4 MIMO communication. This request is sent from the master portable terminal 10 to the base station as a request for “function improvement”, and in response to this, the base station sends another portable terminal to the master portable terminal 10, which is a slave in the example shown here.
- the authority to investigate the function of the portable terminal 40 is given. When this authority is given, the master portable terminal 10 investigates and confirms the function of the slave portable terminal 40.
- the master portable terminal 10 determines that the performance of the master portable terminal 10 has been improved. To tell. For example, information indicating that “the master portable terminal 10 has a function of 4 ⁇ 4 MIMO communication” is transmitted to the base station. The base station receives this information and starts downlink data communication with 4 ⁇ 4 MIMO.
- the master portable terminal 10 and the slave portable terminal 40 may be activated in a state set to perform 4 ⁇ 4 MIMO communication, and may be recognized from the base station as a terminal having a function of 4 ⁇ 4 MIMO communication from the beginning.
- Fig. 6 shows the configuration for baseband signal generation in downlink MIMO transmission described in Figure 6.3-1 of 3GPP TS36.211 V8.5.0 (Non-Patent Document 1) indicating LTE specifications. ing. Here, processing from channel coding to before the transmission RF circuit is shown.
- the generated codeword 0 and codeword 1 are input to scramblers 101 and 102, respectively, and the codeword is scrambled, that is, the data is randomized.
- the outputs of the scramblers 101 and 102 are input to modulation mappers 103 and 104, respectively, and QPSK (quadrature phase shift keying), 16QAM (16-value quadrature phase modulation), Modulation is performed by any one of 64QAM methods.
- the two modulation symbol sequences that are the outputs of the modulation mappers 103 and 104 are input to the layer mapper 109, and these modulation symbol sequences are converted into four sequences x (0), x (1), x (2), x ( 3).
- the output sequences x (0), x (1), x (2), and x (3) sequences from the layer mapper 109 are input to a precoder 110.
- This signal generation is performed in the base station apparatus, and the OFDM signal obtained by the signal generation is converted into an RF signal having the same desired carrier frequency in each RF circuit.
- Each RF signal is transmitted as an electromagnetic wave from the four antennas of the base station.
- the RF signal transmitted from the base station antenna is received by the antennas 17 and 18 in the master portable terminal 10 and input to the RF circuits 13 and 14, and is received by the antennas 47 and 48 in the slave portable terminal 40 and received by the RF circuit. 43 and 44.
- the CPU 11 controls the digital baseband circuit 12, the RF circuits 13 to 16, and the I / F circuit 21 via the control bus 20.
- the I / F circuit 21 is connected to the I / F circuit 51 of the slave portable terminal 40 so that control data can be exchanged between the master portable terminal 10 and the slave portable terminal 40.
- the CPU 11 also controls the digital baseband circuit 42, the RF circuits 43 and 44, and the I / F circuit 51 of the slave portable terminal 40 via the CPU 41 and the control bus 50 of the slave portable terminal 40.
- the RF circuits 13 and 14 perform processing such as filtering, low noise amplification, and synchronous detection on the RF signals received by the antennas 17 and 18, and the outputs of the RF circuits 13 and 14 are digital. Input to the baseband circuit 12.
- the operation differs depending on which of the input ports L1 and L2 is selected by the analog switch 75 in the RF circuits 43 and 44.
- the low noise amplifier 73 in the RF circuits 43 and 44 transmits these RF signals to the master portable terminal 10. It shall be amplified. Therefore, the CPU 11 of the master portable terminal 10 selects the input port L2 in the analog switch 75 inside the RF circuits 43 and 44 with respect to the CPU 41 of the slave portable terminal 40, and puts the RF circuits 43 and 44 into the low input level operation mode. To order. As a result, the RF signal received by the antenna 47 of the slave portable terminal 40 is input to the RF circuit 43, and is input to the RF reception processing unit 70 via the duplexer 76 and the duplexer 78 in the RF circuit 43.
- a filtering process is performed by the pass filter 74, amplified by the low noise amplifier 73, and supplied to the output port A of the RF circuit 43 through the duplexer 77 and the analog switch 75.
- the amplified RF signal is supplied to the RF circuit 16 of the master portable terminal 10 through the coaxial connector group 42, the externally connected coaxial cable, and the coaxial connector group 22.
- the RF signal received by the antenna 48 is amplified by the same processing and input to the RF circuit 15.
- the RF circuits 15 and 16 perform the same processing as that of the RF circuits 13 and 14 and output a digital baseband signal to the digital baseband circuit 12.
- the RF signals received by the antennas 17, 18, 47 and 48 in this way are converted into digital baseband signals by the RF circuits 13 to 16 and input to the digital baseband circuit 12.
- the 4 ⁇ 4 MIMO reception process which is the reverse flow process of the 4 ⁇ 4 MIMO transmission process shown in FIG. 6, is executed, and reception channel encoded data is obtained.
- the obtained reception channel encoded data is sent to the upper layer via the CPU 11.
- the CPU 11 of the master portable terminal 10 instructs the CPU 41 of the slave portable terminal 40 to select the input port L1 in the analog switch 75 in the RF circuits 43 and 44, and the RF circuits 43 and 44 are input to the high level. Command to enter level operation mode.
- the RF signal received by the antenna 47 of the slave portable terminal 40 is supplied as it is to the output port A of the RF circuit 43 via the duplexer 76, the duplexer 78, and the analog switch 75 in the RF circuit 43. .
- This RF signal is supplied to the RF circuit 16 via the coaxial connector group 42, the coaxial cable, and the coaxial connector group 22.
- the RF signal received by the antenna 48 is also input to the RF circuit 15 by the same processing without being amplified.
- the RF circuits 13 to 16 convert the RF signals received by the antennas 17, 18, 47, and 48 into digital baseband signals and output them to the digital baseband circuit 12.
- the digital baseband circuit 12 is shown in FIG. Further, 4 ⁇ 4 MIMO reception processing, which is the reverse flow processing of 4 ⁇ 4 MIMO transmission processing, is executed to obtain reception channel encoded data.
- the obtained reception channel encoded data is sent to the upper layer via the CPU 11.
- the analog switch 75 is not controlled by a command from the CPU 11, but the input port L1, the analog switch 75 is not controlled.
- Manual setting may be directly performed on the slave portable terminal 40 so as to select one of L2.
- the control via the I / F circuit 21 and the I / F circuit 51 can be made unnecessary for downlink 4 ⁇ 4 MIMO reception.
- the received RF signal does not need to be converted into a digital baseband signal. Therefore, instead of the duplexers 77 and 78, two analog switches controlled so as to allow the RF signal to flow to the master portable terminal 10 by the same operation as described above may be used. In this case, the two analog switches in place of the duplexers 77 and 78 can be controlled by a signal for controlling the analog switch 75.
- the CPU 11 of the master portable terminal 10 divides the transmission data into two data streams, sends one data stream to the digital baseband circuit 12, and sends the other data stream to the I / F circuit. 21 and 51 to the digital baseband circuit 42 of the slave portable terminal 40.
- the digital baseband circuit 12 of the master portable terminal 10 further divides the transmitted data stream into two parts and supplies them to the RF circuits 13 and 14, respectively.
- the RF circuits 13 and 14 perform RF transmission processing, The transmission RF signal is transmitted from the antennas 17 and 18 to the base station.
- the digital baseband circuit 42 of the slave portable terminal 40 further divides the data stream sent from the master portable terminal 10 into two parts and supplies them to the RF circuits 43 and 44, respectively. RF transmission processing is performed, and a transmission RF signal is transmitted from the antennas 47 and 48 to the base station.
- the number of antenna elements used for MIMO communication can be easily increased by connecting two portable terminals having 2 ⁇ 2 MIMO communication functions, and spatial multiplexing is performed.
- the number can be increased, and the data transmission capacity can be further increased.
- the configuration shown in FIG. 3 uses two mobile terminals having the same configuration, and can arbitrarily determine which is the master mobile terminal and which is the slave mobile terminal.
- the relationship is symmetric. Therefore, during call connection or call connection disconnection, the role of the portable portable terminal is changed so that the master portable terminal at that time becomes a slave portable terminal and the slave portable terminal becomes the master portable terminal under the control of the CPU 11 or the CPU 41. Can be replaced.
- the output ports A of the RF circuits 43 and 44 are respectively connected to the RF circuits 16 and 15 via the coaxial connector groups 22 and 52 and externally connected coaxial cables. It is necessary to connect the output port A of the RF circuits 13 and 14 to the inputs of the RF circuits 46 and 45, respectively. If the mobile terminal used as the master mobile terminal 10 is fixed and the mobile terminal used as the slave mobile terminal 40 is fixed, that is, an asymmetric configuration may be used, the RF circuit in the slave mobile terminal 40 may be used. 45 and 46 need not be provided.
- the master mobile terminal 10 uses a 2 ⁇ 2 MIMO configuration with two antennas on the transmission side and two antennas on the reception side, and uses only the master mobile terminal 10.
- 2 ⁇ 2 MIMO communication can be performed.
- the master portable terminal 10 and the slave portable terminal 40 are connected, and one antenna (that is, the antenna 17 or the antenna 18) in the master portable terminal 10 and one antenna in the slave portable terminal 40 ( That is, a configuration in which 2 ⁇ 2 MIMO communication is performed using the antenna 47 or 48) may be employed.
- the interval between the two antennas can be increased, the correlation between the antennas can be reduced, and the transmission capacity can be increased as compared with the case where 2 ⁇ 2 MIMO communication is performed with one mobile terminal.
- the diversity effect is enhanced and the quality of data communication can be improved.
- the present invention is not limited to the above-described embodiment.
- the number of antenna elements involved in MIMO communication can be further increased, the number of spatial multiplexing can be further increased, and data communication quality and transmission capacity can be improved. be able to.
- a connection form between the master portable terminal and two or more slave portable terminals for example, a daisy chain form in which slave portable terminals are connected in a daisy chain, or one-to-many connection in which each slave portable terminal is directly connected to the master portable terminal.
- a connection form, or a combination of a daisy chain form and a one-to-many connection form is a connection form, or a combination of a daisy chain form and a one-to-many connection form.
- FIGS 2A to 2C described above show examples of connection modes when one master portable terminal and three slave portable terminals are connected.
- the master portable terminal is represented by “M”
- the slave portable terminal is represented by “S”.
- 2A shows a connection in the form of a daisy chain
- FIG. 2B shows a connection in a one-to-many (in this case, one-to-three)
- FIG. 2C shows a connection in which a daisy chain connection and a one-to-many connection are combined. ing.
- the distance between the antenna element of the master portable terminal and the antenna element of the slave portable terminal can be increased as compared with the case where these antenna elements are built in a single portable terminal. Correlation between elements can be kept low. Therefore, the theoretical maximum performance in MIMO communication can be extracted.
- the above-described present invention is not limited to 2 ⁇ 2 MIMO provided as a standard in terminal devices based on 3GPP LTE, but communication having a MIMO communication processing unit of order of 4 ⁇ 4 MIMO expected to be the maximum number in IEEE 802.11n or higher.
- MIMO communication processing unit of order of 4 ⁇ 4 MIMO expected to be the maximum number in IEEE 802.11n or higher.
- small devices used as slave mobile terminals are other types of communication that use multiple antenna elements, such as selection diversity, synthesis diversity, and STBC (Space Time Block Coding). It is also possible to perform high-quality data communication according to the method.
- Such an embodiment of the present invention can be applied to fields such as 3GPP LTE, mobile WiMAX (IEEE802.16e), and wireless LAN (IEEE802.11n) to which the MIMO communication method is applied.
- a wireless LAN for example, a wireless LAN parent station connected to an upper network by an optical line or the like is used as a base station, and a plurality of slave station terminals (for example, wireless LAN cards) connected to the wireless LAN parent station
- the present invention may be applied to
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Abstract
Description
11,41 CPU
12,42 デジタルベースバンド回路
13~16,43~46 RF回路
17,18,47,48 アンテナ
19,49 データバス
20,50 制御バス
21,51 I/F回路
22,52 同軸コネクタ群
40,S スレーブ携帯端末
70,90 RF受信処理部
71 RF送信処理部
72,92 直交復調器
73,93 低雑音増幅器
74,94 バンドパスフィルタ
75 アナログスイッチ
76 デュプレクサ
77,78 分波器
Claims (6)
- 基地局と通信する無線通信装置であって、
それぞれアンテナ素子とRF回路とを有する複数の端末を備え、該複数の端末の一つをマスター端末とし残りの端末をスレーブ端末とし、
前記各スレーブ端末は少なくとも高周波伝送路を含むインタフェースによって前記マスター端末に接続され、
前記マスター端末は、制御部と、前記RF回路が接続するMIMO処理部と、をさらに備え、
前記制御部は、前記MIMO処理部と前記マスター端末の前記RF回路と前記各スレーブ端末の前記RF回路とを制御可能であって、前記マスター端末の前記アンテナ素子で受信したRF信号と前記各スレーブ端末の前記アンテナ素子で受信されて前記高周波伝送路を介して前記マスター端末に伝送されてきたRF信号とに基づき、前記MIMO処理部にMIMO受信処理を実行させる、無線通信装置。 - 前記複数の端末は、いずれも単体でMIMO通信機能を有し、前記マスター端末と前記スレーブ端末とによって、前記複数の端末の各々単体でのMIMO通信機能における空間多重度よりも高次の空間多重度のMIMO通信を実行する、請求項1に記載の無線通信装置。
- 前記マスター端末は、複数の前記アンテナ素子と、当該アンテナ素子ごとに設けられて送受信処理を行うことができる送受信用の前記RF回路と、受信処理のみを行う受信用の前記RF回路とを備え、
前記各スレーブ端末は、複数の前記アンテナ素子と、当該アンテナ素子ごとに設けられて送受信処理を行うことができる送受信用の前記RF回路とを備え、
前記各スレーブ端末の前記アンテナ素子で受信されたRF信号が、前記マスター端末の前記受信用の前記RF回路にそれぞれ伝送される、請求項1または2に記載の無線通信装置。 - 前記スレーブ端末の前記送受信用のRF回路は、各々、対応する前記アンテナからのRF信号を増幅する増幅器を備え、前記制御部からの制御によって、前記増幅器によって増幅された前記RF信号が前記スレーブ端末から前記マスター端末に伝送される、請求項3に記載の無線通信装置。
- 呼接続中あるいは呼接続断時に、その時点での前記マスター端末をスレーブ端末とし、前記スレーブ端末のいずれか一つをマスター端末とすることとができる、請求項1乃至4のいずれか1項に記載の無線通信装置。
- 複数の前記スレーブ端末を有し、前記マスター端末に対し、前記複数のスレーブ端末が、デイジーチェーン接続による接続形態、1対多接続による接続形態、あるいはデイジーチェーン接続と1対多接続とを組み合わせた接続形態によって接続する、請求項1乃至5のいずれか1項に記載の無線通信装置。
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US20130295984A1 (en) | 2013-11-07 |
CN103299568A (zh) | 2013-09-11 |
CN103299568B (zh) | 2016-06-08 |
EP2665213A4 (en) | 2017-04-12 |
US9014750B2 (en) | 2015-04-21 |
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JP5884737B2 (ja) | 2016-03-15 |
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