WO2005093982A1 - 無線通信機 - Google Patents
無線通信機 Download PDFInfo
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- WO2005093982A1 WO2005093982A1 PCT/JP2005/004093 JP2005004093W WO2005093982A1 WO 2005093982 A1 WO2005093982 A1 WO 2005093982A1 JP 2005004093 W JP2005004093 W JP 2005004093W WO 2005093982 A1 WO2005093982 A1 WO 2005093982A1
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- transmission
- modulation
- demodulation
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- signal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to a wireless communication system using a spatial multiplexing method.
- FIG. 1 is a block diagram of a wireless communication device using this method.
- the transmitter 500 includes a transmission circuit 501-1-3, an antenna 502-1-3, and a transmission signal processing circuit 504.
- the transmission data is signal-processed by the transmission signal processing circuit 504, and is transmitted as a radio wave from the antenna 502-1-3 by the transmission circuit 501-1-3.
- the receiver 506 includes an antenna 508-1-3, a receiving circuit 507-1-3, and a received signal processing circuit 510.
- a MIMO wireless communication device is a wireless communication device including an antenna and a transmitter and an antenna and a receiver, or a wireless communication device including a plurality of antennas and a plurality of transceivers. Communicates by. [0004] Within the range of the number of communication paths (independent spatial transmission paths) that can be orthogonalized, including multipath! The transmission speed is proportional to the number of antennas (the smaller of the number of transmitting antennas and the number of receiving antennas). You. Therefore, the transmission speed can be improved while using the same frequency and the same time. In addition, by using the space-time coding, a space diversity effect is generated, and a good SNR (Signal to Noise Ratio) can be obtained.
- SNR Signal to Noise Ratio
- a wireless communication device incorporating the MIMO technology consumes a large amount of power to operate a plurality of transmission / reception circuits.
- the transmission signal processing circuit has a function of estimating a channel matrix and converting and distributing the transmission signal to a plurality of transmission circuits
- the reception signal processing circuit has a function of combining and converting reception signals of a plurality of reception circuits.
- 10 wavelengths are exemplified as the element spacing of the base station four-element antenna in the mobile phone system in such a case.
- Such an antenna interval is not realistic in terms of size when applied to a mobile terminal or a microwave radio communication device used in offices and homes.
- ASK Amplit Shift Keying
- FSK Frequency Shift Keying
- BPSK Binary Phase Shift Keying
- An object of the present invention is to provide a small-sized radio communication device that performs high-speed transmission while suppressing power consumption, causes a communication interruption due to multipath interference, and 1.
- a wireless communication device includes: A plurality of transmitting antennas that emit radio waves based on the transmitted RF signal,
- a plurality of transmission circuit means for supplying the transmission RF signal to each of the plurality of transmission antennas based on the plurality of transmission signals;
- Transmission signal processing means comprising modulation means, modulating the input transmission data with the modulation means to generate the plurality of transmission signals, and outputting the plurality of transmission signals to the transmission circuit means;
- a transmitter including
- a plurality of receiving antennas for receiving a radio wave to output a received RF signal, and a plurality of receiving circuit means for outputting a received signal based on the received RF signal input to each of the plurality of receiving antennas;
- Receiving signal processing means comprising demodulation means, and demodulating the reception signal output from each of the reception circuit means by the demodulation means to generate reception data
- Propagation detection means for detecting the propagation state of the radio wave
- a symbol rate setting means for selecting a symbol rate to be used from a plurality of symbol rates based on the detected propagation state, and setting the modulation means and the demodulation means.
- a wireless communication device comprises:
- a plurality of transmitting antennas that emit radio waves based on the transmitted RF signal
- a plurality of transmission circuit means for supplying the transmission RF signal to each of the plurality of transmission antennas based on the plurality of transmission signals;
- a plurality of modulating means having different symbol rates, and modulating input transmission data by a modulating means selected from the plurality of modulating means to generate the plurality of transmission signals; Transmission signal processing means for outputting to the means;
- a transmitter including
- a plurality of antennas that sense radio waves and output received RF signals
- a plurality of receiving circuit means for outputting a received signal based on the received RF signal input to each of the plurality of receiving antennas;
- a plurality of demodulating means having different symbol rates are provided.
- a receiver including
- Propagation detection means for detecting the propagation state of the radio wave
- a plurality of modulating means and a modulating means / demodulating means selecting means for selecting each one of the modulating means and the demodulating means from the plurality of demodulating means.
- the wireless communication device By controlling the symbol rate in accordance with the strength of multipath interference, high-speed transmission while optimizing power consumption becomes possible. Further, in the case of a wireless communication device using a frequency of 10 GHz or more, especially a millimeter wave (30 GHz to 300 GHz), the wireless communication device can be made compact even if a plurality of antennas are arranged in an array. Furthermore, when multi-noise interference is weak, high-speed operation and low power consumption can be realized by operating in the direct modulation / demodulation mode. On the other hand, when multipath interference is strong, although the power consumption increases, the possibility of communication interruption due to multipath interference can be reduced, and communication can be continued while maintaining a certain transmission rate.
- FIG. 1 is a block diagram of a conventional wireless communication device.
- FIG. 2 is a block diagram of a wireless communication device according to a first embodiment of the present invention.
- FIG. 3 is a flowchart of a process for determining a symbol rate according to the first embodiment.
- FIG. 4 is a graph showing an example of a relationship between received power and an error rate which define the strength of multipath interference.
- FIG. 5 is a graph showing the relationship between the number of independent spatial transmission paths and the degree of multipath in MIMO.
- FIG. 6 is a flowchart of a process for determining a symbol rate in a first modified example.
- FIG. 7 is a flowchart of a process for determining a symbol rate and a multilevel number of modulation in a second modification.
- FIG. 8 is a flowchart of a process for determining a symbol rate and a multilevel number of modulation in a third modification.
- FIG. 9 is a flowchart of a process including a process of determining a symbol rate according to a fourth modification.
- FIG. 10 is a flowchart of a process including a process of determining a symbol rate and a multilevel number of modulation in a fifth modified example.
- FIG. 11 is a block diagram of a wireless communication device according to a second embodiment of the present invention.
- FIG. 12 is a flowchart of a process related to the setting of a transceiver according to the second embodiment.
- FIG. 13 is a block diagram of a wireless communication device according to a modified example of the second embodiment of the present invention.
- FIG. 14 is a block diagram of a wireless communication device according to a third embodiment of the present invention.
- FIG. 15 is a flowchart of a process related to the setting of a transceiver according to the third embodiment.
- FIG. 16 is a block diagram of a wireless communication device according to a fourth embodiment of the present invention.
- FIG. 17 is a block diagram of a wireless communication device according to a fifth embodiment of the present invention.
- FIG. 18 is a block diagram of a wireless communication device according to a modified example of the fifth embodiment of the present invention.
- FIG. 19 is a block diagram of a wireless communication device according to a sixth embodiment of the present invention.
- the wireless communication device includes a transmitter 100 and a receiver 106.
- a transmitter 100 and a receiver 106 communicate with each other.
- transmitter 100 and receiver 106 are the transmitter and receiver of the opposing wireless communication device, respectively.
- Transmitter 100 includes antennas 102-113, transmission circuits 101-113 connected to antennas 102-1-1, power supply control circuit 103, transmission signal processing circuit 104, circuit
- the power control circuit 103 controls the power supplied to the transmission circuits 101-113 based on the power control signal from the control circuit 119.
- the transmission signal processing circuit 104 has at least one function of encoding and weighting Z mapping in addition to modulation. Further, the transmission signal processing circuit 104 includes a symbol rate setting section 117, a modulation rate setting section 118, and a modulation section 105, and can change the symbol rate and the number of levels of modulation by a control signal from the control circuit 119. .
- the transmission signal processing circuit 104 modulates the data input to the transmitter 100 by the modulation section 105 and outputs the result to the transmission circuits 101-113 as a transmission signal.
- the receiver 106 includes an antenna 108-1-3, a receiving circuit 107-1-3 connected to the antenna 108-1-3, a power control circuit 109, a received signal processing circuit 110, a level It comprises a detector 111, an error rate measuring device 112, a propagation detection circuit 123, and a control circuit 124.
- the power control circuit 109 controls power supplied to the receiving circuits 107-13 based on a power control signal from the control circuit 124.
- the reception signal processing circuit 110 includes a symbol rate setting unit 122, a demodulation mode setting unit 123, and a demodulation unit 120, and has at least one function of decoding related to MIMO processing and weighted Z demapping in addition to demodulation.
- the reception signal processing circuit 110 demodulates the reception signal input from the reception circuit 107-1-3 by the demodulation unit 120 and outputs the demodulated signal as reception data.
- received signal processing circuit 110 estimates and outputs a channel matrix based on the received signals input from receiving circuits 107-13.
- the level detector 111 detects a reception level based on the reception level signal input from the reception circuit 107-1-3 and outputs it.
- Error rate measuring device 112 measures a bit error rate or a frame error rate based on the received data output from received signal processing circuit 110, and outputs an error rate.
- the propagation detection circuit 123 receives the reception level, the error rate, and the channel matrix, determines the level of multipath interference, and outputs a modulation control signal and a propagation status communication signal equivalent thereto.
- the control circuit 124 outputs a power control signal to the power control circuit 109 and sets the symbol rate and the demodulation mode in the symbol rate setting section 122 and the demodulation mode setting section 123 based on the modulation control signal.
- the propagation situation communication signal is sent to control circuit 119 of communication apparatus 106, and control circuit 119 sets the symbol rate and modulation mode in symbol rate setting section 117 and modulation mode setting section 118, respectively.
- the symbol rate is determined as shown in FIG.
- the propagation detection circuit 123 determines the reception level output from the level detector 111, the error rate output from the error rate measurement device 112, the channel matrix output from the reception signal processing circuit 110, and the like. Based on this, the strength of multipath interference is estimated.
- step 1002 it is determined whether multipath interference is strong. If it is determined that the interference is strong, propagation detection circuit 123 outputs a modulation control signal for setting the symbol rate to be low and a propagation status communication signal.
- Control circuit 119 receives the propagation status communication signal, and causes symbol rate setting section 117 to reduce the symbol rate of modulation section 105 to step 1003. Further, the control circuit 124 lowers the symbol rate of the demodulation section 120 by the symbol rate setting section 122. If it is determined in step 1002 that the interference is weak, the propagation detection circuit 123 outputs a modulation control signal for setting a high symbol rate and a propagation status communication signal. The control circuit 119 increases the symbol speed of the modulation section 105 by the symbol rate setting section 117 in step 1004. Further, the control circuit 124 causes the symbol rate setting section 122 to increase the symbol rate of the demodulation section 120. When the symbol rate is determined, communication, which is normal data transmission, is performed thereafter.
- the signal propagation state of the own station or another station can be known during a preamble period for establishing synchronization with another station or a period during communication in which data transmission is being performed. During communication, it is possible to receive the signal propagation state of another station transmitted as part of the data transmitted. Also, it transmits the signal transmission status of its own station to other stations.
- the signal propagation state is calculated based on the reception level output from level detector 111, the error rate output from error rate measurement unit 112, and the channel matrix power output from reception signal processing circuit 110.
- the signal propagation state can be represented by the number of independent spatial transmission paths that can contribute to communication, the rate of retransmission requests due to errors, and the like.
- the relationship between the received power and the error rate is defined in terms of the strength of multipath interference, and the error rate (or the rate of retransmission requests due to errors) despite the high received power. Is high, it is possible to prescribe the case where the multipath interference is strong. Also, as shown in Fig.
- the estimated channel Eigenvalue force calculated from the matrix It is also possible to determine the number of independent spatial transmission paths that can contribute to communication and determine the degree of multipath interference. These methods can be combined, or the degree of multipath interference can be defined stepwise. Of course, it is also possible to use a method in which the symbol rate is set low first, and then gradually increased.
- the degree of multi-noise interference when the degree of multi-noise interference is small, high-speed transmission becomes possible by setting a high symbol rate.
- the correlation bandwidth is often widened, which is advantageous for high symbol rates, that is, wideband transmission.
- the antennas are compared with those using a microwave band.
- the size is small. For example, when using 60 GHz, the antenna spacing is about 2.5 mm for half wavelength and about 2.5 cm for 10 wavelengths. Applicable to machines.
- the configuration of the wireless communication device is the same as that of the first embodiment, and the symbol rate can be changed by the modulation control signal and the propagation status communication signal.
- the symbol rate is set to a higher value in the symbol rate setting units 117 and 122. That is, modulation section 105 and demodulation section 120 are set to a high symbol rate.
- the error rate is measured by the error rate measuring device 112.
- the propagation detection circuit 123 determines whether or not the error rate is within a sufficiently allowable range for communication. If the error rate is not sufficiently acceptable, in step 2004, the symbol rate is set lower by one using the modulation control signal and the propagation status communication signal. That is, the symbol rate of the modulation / demodulation units 105 and 120 is reduced by one step. Then, returning to step 2002, the error rate is measured again under the new conditions, and the symbol rate is reduced until the error rate is within an acceptable range. Therefore, the symbol rate is reduced until the error rate is sufficiently low.
- This process can be performed before the communication. ,
- the frame error rate, the packet error rate, the retransmission request rate (retransmission rate), etc. are monitored, and the symbol rate can be appropriately reduced so that these values are sufficiently low.
- the error rate or the like becomes sufficiently low, it may be determined that the multipath interference has been reduced, and the symbol speed may be increased so that the transmission speed is increased again.
- the same effects as those of the first embodiment can be obtained, but conditions can be set for high-speed transmission according to the situation.
- a second modification of the first embodiment will be described with reference to FIG.
- the second modification an example of a procedure for determining the symbol rate and the number of levels of modulation will be described.
- the configuration of the wireless communication device is the same as that of the first embodiment, and the modulation level and the symbol rate can be changed by the modulation control signal and the propagation status communication signal.
- the propagation detection circuit 123 estimates the strength of multinos interference. If it is determined in step 3002 that the interference is weak, in step 3003, the number of modulation levels for increasing the symbol rate is set to a small value. That is, the symbol rate setting units 117 and 122 and the modulation mode setting units 118 and 123 are set as such. If it is determined that the interference is strong, in step 3004, the multi-level number of the modulation for decreasing the symbol rate is set to be large. That is, the symbol rate setting units 117 and 122 and the modulation mode setting units 118 and 123 are set as such. The subsequent communication is performed using the symbol rate and the multi-level number of modulation set in this way.
- the determination of multipath interference can be performed in the same manner as that described in the first embodiment.
- the degree of multipath interference is small, high-speed transmission is possible by increasing the symbol rate.
- efficient transmission can be achieved by lowering the symbol rate and narrowing the signal band.
- step 4001 symbol rate setting sections 117 and 122 are set to a high symbol rate as an initial state, and the number of modulation levels is set to a small value.
- step 4002 the error rate is measured by the error rate measuring device 112.
- step 4003 it is determined whether or not this error rate is in a range that is sufficiently acceptable for communication.
- step 4004 If the error rate is not sufficiently acceptable, in step 4004, the modulation level is increased and the symbol rate is set lower.
- Step 4002 Go back and measure the error rate under new conditions. The symbol rate is reduced and the multivalued number is increased until the error rate is within a sufficiently acceptable range. Therefore, the symbol rate is reduced until the error rate is sufficiently low, and the multi-level number is increased.
- This process monitors the bit error rate, frame error rate, packet error rate, retransmission request rate, etc. even during data communication, which can be performed before communication, and makes sure that these figures are sufficiently low.
- the symbol rate can be appropriately reduced, and the multi-value number can be appropriately increased.
- the error rate or the like becomes sufficiently low, it may be determined that the multipath interference has been reduced, and the process of increasing the symbol rate to increase the transmission rate again may be included.
- the same effect as that of the second modified example can be obtained, but conditions can be set according to the situation for high-speed transmission.
- a fourth modification of the first embodiment will be described with reference to FIG.
- an example of an operation process including a procedure for determining a symbol rate will be described.
- the configuration of the wireless communication device is the same as that of the first embodiment, and the symbol rate can be changed by the modulation control signal and the propagation status communication signal.
- step 5001 the strength of multipath interference is estimated according to, for example, the method described in the first embodiment. If it is determined in step 5002 that the interference is strong, in step 5005, the symbol rate is set low. On the other hand, if it is determined that the interference is weak, the symbol rate is set to high in step 5003. In this case, in step 5004, the power supply circuits 103 and 109 turn off the power of the transmission circuit and the reception circuit that do not contribute to the transmission speed in order to suppress power consumption. That is, the power consumption of the circuits that are not operating is reduced by turning off the power.
- a fifth modification of the first embodiment will be described with reference to FIG.
- a fifth modified example another example of the operation process including the process of determining the symbol rate and the multilevel number of modulation will be described.
- the configuration of the wireless communication device is the same as that of the first embodiment, and the modulation level and the symbol rate can be changed by the modulation control signal and the propagation status communication signal.
- step 6001 the strength of multipath interference is estimated according to, for example, the method described in the first embodiment. If it is determined in step 6002 that the interference is strong, in step 6003, the symbol rate is set low and the number of modulation levels is set large. On the other hand, if it is determined that the interference is weak, in step 6004, the symbol rate is set to be high, and the number of modulation levels is set to be large. In this case, in step 6005, the power of the transmitting circuit and the receiving circuit that do not contribute to the transmission speed is turned off to suppress power consumption. That is, the power consumption of the circuit that is not operating is reduced by turning off the power supply.
- This modification is different from the fourth modification in that when it is determined that the interference is weak, the multi-level number of the modulation that increases the symbol rate is set small, and it is determined that the interference is strong. In this case, the difference is that the multi-level number of modulation for lowering the symbol rate is set larger.
- the same effect as that of the fourth modified example is obtained, and it becomes possible to set conditions for high-speed transmission according to the situation.
- FIG. 11 shows a block diagram of a wireless communication device according to the second embodiment of the present invention.
- a direct modulation / demodulation Z non-direct modulation / demodulation mode is used.
- the direct modulation mode is a method in which direct transmission data is modulated on a transmission carrier
- the non-direct modulation mode is a method in which signal processing is performed and then modulated, and up-converted to a radio frequency band.
- the direct demodulation mode is a method of demodulating a received signal directly to received data
- the non-direct demodulation mode is a method of down-converting radio frequency band power, performing demodulation, and then performing signal processing to generate received data. .
- the wireless communication device includes a transmitter 200 and a receiver 206.
- a plurality of wireless communication devices communicate with each other.
- the transmitter 200 and the receiver 206 are the transmitter and the receiver of the wireless communication device facing each other.
- Transmitter 200 includes a transmission circuit 201-1 in an indirect modulation mode connected to antenna 202-1-14, an indirect modulation mode connected to antenna 202-1, and a transmission circuit in an indirect modulation mode connected to antenna 202-2.
- Signal circuit 201-2 a non-direct modulation mode transmission circuit 201-3 connected to the antenna 202-3, and a direct modulation mode transmission circuit 201- connected to the antenna 202-4 and having a built-in modulation section 224.
- a transmission signal is input to the transmission circuits 201-113 through the transmission signal processing circuit 204, and a transmission signal is directly input to the transmission circuit 201-4 without passing through the transmission signal processing circuit 204.
- the power control circuit 203 controls the power supplied to the transmission circuits 201-1 to 114 based on the power control signal from the control circuit 219.
- the transmission signal processing circuit 204 has at least one function of coding, modulation, and weighted Z mapping in addition to modulation. Further, the transmission signal processing circuit 204 includes a modulation section 205, a symbol rate setting section 217, and a modulation mode setting section 218, and can change the symbol rate and the number of levels of modulation by a modulation control signal.
- the transmission signal processing circuit 204 modulates the data input to the transmission device 200 by the modulation unit 205, and outputs the result to the transmission circuits 201-113 as a transmission signal.
- Receiver 206 has antennas 208-1-4, a non-direct demodulation mode receiving circuit 207-1 connected to antenna 208-1, and a non-direct demodulation mode receiving circuit connected to antenna 208-2.
- a power control circuit 209 a received signal processing circuit 210, a level detector 211, an error rate measuring device 212, a propagation detection circuit 224, and a control circuit 222.
- the control circuit 209 controls the power supplied to the receiving circuit 207-1-4 based on the power control signal from the control circuit 224.
- the reception signal processing circuit 210 has at least one function of decoding and weighting Z demapping related to MIMO processing in addition to demodulation.
- the reception signal processing circuit 210 demodulates the reception signal input from the reception circuits 207-113 by the demodulation section 220 and outputs it as reception data. Further, received signal processing circuit 210 has a function of estimating a channel matrix, and estimates and outputs a channel matrix based on a received signal input from receiving circuits 207-113.
- the level detector 211 detects and outputs a reception level signal based on the reception level signal input from the reception circuit 207-1.
- the error rate measuring device 212 measures the bit error rate or the frame error rate based on the received data to which the received signal processing circuit 210 and the receiving circuit 207-4 are also output, and outputs the error rate.
- the propagation detection circuit 223 receives the reception level, the error rate, and the channel matrix, determines the level of multipath interference, and outputs a modulation control signal and a propagation status communication signal equivalent thereto.
- the control circuit 224 outputs a power control signal to the power control circuit 209 and sets a symbol rate and a demodulation mode in the symbol rate setting section 222 and the demodulation mode setting section 223 based on the modulation control signal. Further, the propagation status communication signal is sent to control circuit 219 of transmitting apparatus 206, and control circuit 219 sets the symbol rate and modulation mode in symbol rate setting section 217 and modulation mode setting section 218, respectively.
- any one of ASK, FSK, BPSK, QPSK, DQPSK and the like is used.
- the transmission circuit 201-4 modulates the input data into a transmission carrier, and the reception circuit 2074-4 demodulates the received signal power data directly.
- Such modulation and demodulation will be referred to as direct modulation and demodulation.
- the symbol rates used in the transmission circuit 201-4 and the reception circuit 207-4 are set higher than those in the non-direct modulation / demodulation mode transmission circuit 201-13 and the reception circuit 207-1-3.
- the non-direct modulation / demodulation mode any of multi-level PSK, multi-level QAM, etc., or OFDM using these as primary modulation can be used.
- step 7001 the power of the transmitting circuit 201-4 is turned on under the control of the power control circuit 203, and the power of the receiving circuit 207-4 is turned on under the control of the power control circuit 209. Stets
- step 7002 the power of the transmitting circuit 201-1-1-3 is controlled by the control of the power control circuit 203, and the power of the receiving circuit 207-1-1-3 is controlled by the control of the power control circuit 209.
- step 7003 the error rate is measured by the error rate measuring device 212.
- step 7004 the propagation detection circuit 223 determines whether or not the error rate is within a range that is sufficiently allowable for communication.
- step 7005 the power of the transmitting circuit 201-4 is turned off under the control of the power control circuit 203, and the power of the receiving circuit 207-4 is controlled under the control of the power control circuit 209. Turn off the power. Therefore, the transmission circuit 201-4 and the reception circuit 207-4 do not operate.
- step 7006 the power of the transmitting circuits 201—1—201—3 is turned on by the control of the power control circuit 203, and the power of the receiving circuits 207—1-1 and 207—3 is turned on by the control of the power control circuit 209, and operation is possible. State. Finally, the setting operation is performed in step 7007. In the setting operation, the setting of the wireless communication by the normal MIMO technique is performed, or the symbol rate and the multi-level number of the modulation are determined by using the procedure described in the first embodiment and its modification.
- DACs digitalZA conversion circuits
- ADCs AZD conversion circuits
- MIMO processing circuits space-time code processing circuits, and the like
- the power of a large portion can be turned off, and low power consumption can be realized.
- ASK is used for direct modulation and demodulation
- a wireless transmission speed of 1.25 Gbit Z-second is realized using the 60 GHz band, as described in the above-mentioned K. Ohata et al. .
- a high-speed switch and a detector are required as elements required for modulation and demodulation, but the power consumption is generally smaller than that of the above circuit.
- FIG. 13 is a block diagram showing a configuration of a wireless communication device according to the present modification.
- the configuration may be replaced by the same reference numerals as in FIG. 11 described in the second embodiment. That is, the wireless communication device is A receiver 306 is provided.
- Transmitter 300 includes a transmission circuit 301-1 in an indirect modulation mode connected to antenna 302-1-13, an indirect modulation mode connected to antenna 302-1, and a transmission circuit in an indirect modulation mode connected to antenna 302-2.
- the transmission circuit 301-3 and the transmission circuit 301-4 are connected to the antenna 302-3 via the switch 313. Transmission data is input to the transmission circuits 301-113 through the transmission signal processing circuit 304, and transmission data is directly input to the transmission circuits 301-4 without passing through the transmission signal processing circuit 304. .
- the power control circuit 303 controls the power supplied to the transmission circuits 301-1 to 114 based on the power control signal from the control circuit 319.
- the transmission signal processing circuit 304 has at least one function of coding, modulation, and weighted Z mapping in addition to modulation. Further, the transmission signal processing circuit 304 includes a modulation section 305, a symbol rate setting section 317, and a modulation mode setting section 318, and can change the symbol rate and the number of levels of modulation by a modulation control signal.
- the transmission signal processing circuit 304 modulates the data input to the transmission device 300 by the modulation section 305, and outputs the result to the transmission circuit 301-11 as a transmission signal.
- Receiver 306 includes an antenna 308-1-3, a non-direct demodulation mode receiving circuit 307-1 connected to antenna 308-1, and a non-direct demodulation mode receiving circuit connected to antenna 308-2.
- the receiving circuits 307-3 and 307-4 are connected to the antenna 308-3 via the switch 314.
- the power control circuit 309 controls the power supplied to the receiving circuits 307-1 to 14 based on the power control signal from the control circuit 324.
- the reception signal processing circuit 310 has at least one function of decoding and weighting Z demapping related to MIMO processing in addition to demodulation.
- the reception signal processing circuit 310 demodulates the reception signal input from the reception circuit 307-1-3 by the demodulation unit 320 and outputs the demodulated signal as reception data. Also, the received signal
- the processing circuit 310 estimates and outputs a channel matrix based on the received signal input from the receiving circuit 307-1-3.
- the level detector 311 detects a reception level based on the reception level signal input from the reception circuit 307-1-4 and outputs it.
- the error rate measuring device 312 measures the bit error rate or the frame error rate based on the received data to which the received signal processing circuit 310 and the receiving circuit 307-4 are also output, and outputs the error rate.
- the propagation detection circuit 323 receives the reception level, the error rate, and the channel matrix, determines the level of multipath interference, and outputs a modulation control signal and a propagation status communication signal equivalent thereto.
- the control circuit 324 outputs a power control signal to the power control circuit 309 and sets a symbol rate and a demodulation mode in the symbol rate setting section 322 and the demodulation mode setting section 323 based on the modulation control signal. Further, the propagation situation communication signal is sent to control circuit 319 of transmitting apparatus 300, and control circuit 319 sets the symbol rate setting section 317 and modulation mode setting section 318 to the symbol rate and the modulation mode, respectively.
- any of ASK, FSK, BPSK, QPSK, DQPSK, and the like is used.
- the transmission circuit 301-4 modulates the signal to the transmission carrier, and the reception circuit 307-4 demodulates the data directly from the received signal.
- the symbol rates used in the transmission circuits 301-4 and 307-4 are set higher than those of the non-direct modulation / demodulation mode transmission circuits 301-113 and 307-113.
- the difference of the present modification from the wireless communication apparatus of FIG. 11 lies in the fact that the antenna is shared.
- the transmission circuit 301-3 and the transmission circuit 301-4 are connected to the antenna 302-3 via the switch 313.
- the receiving circuit 307-3 and the transmitting circuit 307-4 are connected to the antenna 308-3 via the switch 314.
- the antennas 302-3 and 308-3 are commonly used, and switches 313 and 314 linked to the power control signal are provided in the transmitter 300 and the receiver 306, respectively.
- the size of the device can be reduced by sharing the antenna.
- a switch is used in the description here, a common duplexer can be used.
- FIG. 14 is a block diagram illustrating a configuration of a wireless communication device according to the third embodiment of the present invention.
- the wireless communication device includes a transmitter 400 and a receiver 406. Communication is usually bidirectional Therefore, a plurality of wireless communication devices communicate with each other.
- transmitter 400 and receiver 406 are the transmitter and receiver of the opposing wireless communication device, respectively.
- the transmitter 400 includes an antenna 402-1-3, a transmission circuit 401-11 connected to the antenna 402-1-3, a power control circuit 403, a transmission signal processing circuit 404, A circuit 419 and a selector 428 are provided.
- Each of the transmission circuits 401-1-3 can select a modulation method of a direct modulation mode and a non-direct modulation mode.
- a transmission signal is input via a transmission signal processing circuit 404 and a data signal is input via a selector 428, and which signal is used is set by the selector 428.
- Each of the transmission circuits 401-1-3 includes a modulation unit 426-1-3 that modulates a carrier with a data signal input through the selector 428.
- the power control circuit 403 controls the power supplied to the transmission circuits 401-113 based on the power control signal from the control circuit 419.
- the transmission signal processing circuit 404 has at least one function of encoding, modulation, and weighting Z mapping in addition to modulation. Further, the transmission signal processing circuit 404 includes a modulation section 405, a symbol rate setting section 417, and a modulation mode setting section 418, and can change the symbol rate and the number of levels of modulation by a modulation control signal.
- the transmission signal processing circuit 404 modulates the input data by the modulation section 405 and outputs it as a transmission signal to the transmission circuits 401-113.
- the selector 428 has a function of distributing data to the transmission circuits 401-113 and selecting a modulation method between a direct modulation mode and a non-direct modulation mode.
- the receiver 406 is connected to the antennas 408-113 and the antennas 408-1.3, respectively, and a receiving circuit 407-113 that can select a direct demodulation mode or a non-direct demodulation mode, and a power supply control.
- the circuit includes a circuit 409, a received signal processing circuit 410, a level detector 411, an error rate measuring device 412, a selector 429, a propagation detection circuit 423, and a control circuit 424.
- the receiving circuit 407-1-3 includes demodulating sections 427-1 to 13-3 for demodulating a received signal input via the antenna 408-1-3.
- the power control circuit 409 controls the power supplied to the receiving circuits 407-1 to 13 based on the power control signal from the control circuit 424.
- the reception signal processing circuit 410 has at least one function of decoding and weighted Z demapping in addition to demodulation.
- the reception signal processing circuit 410 processes the reception signal input from the reception circuit 407-1-3. Demodulated by demodulation section 420 and output as received data.
- reception signal processing circuit 410 estimates a channel matrix based on the reception signal input from reception circuit 407-1-3, and outputs the channel matrix.
- Level detector 411 detects a reception level based on a reception level signal input from reception circuit 407-1-3, and outputs it.
- the error rate measuring device 412 measures a bit error rate or a frame error rate based on the reception data output from the reception signal processing circuit 410 and the selector 429, and outputs an error rate.
- the selector 429 has a function of allocating data output from the reception circuit 407-1-3 and selecting a demodulation method between a direct demodulation mode and a non-direct demodulation mode.
- the propagation detection circuit 423 receives the reception level, the error rate, and the channel matrix, determines the level of multipath interference, and outputs a modulation control signal and a propagation status communication signal equivalent thereto.
- the control circuit 424 outputs a power control signal to the power control circuit 409, and sets a symbol rate and a demodulation mode in the symbol rate setting section 422 and the demodulation mode setting section 423, respectively, based on the modulation control signal. Further, the propagation status communication signal is sent to control circuit 419 of transmitting apparatus 400, and control circuit 419 sets the symbol rate and modulation mode in symbol rate setting section 417 and modulation mode setting section 418, respectively.
- any of! / such as ASK, FSK, BPSK, QPSK, and DQPSK, is used.
- Transmitter 400 modulates the signal to the transmission carrier, and receiver 406 demodulates the data directly from the received signal.
- the symbol rate is set higher than the transmission circuit and the reception circuit in the non-direct modulation mode.
- the non-direct modulation / demodulation mode it is possible to use! / ⁇ deviation such as multi-level PSK and multi-level QAM, or use OFDM or the like that uses these as primary modulation.
- a procedure related to the setting of the transmission / reception circuit is performed.
- the control circuits 419 and 424 and the selector 428 are set to the direct modulation mode, and the selector 429 is set to the direct demodulation mode.
- communication is performed in the direct modulation / demodulation mode.
- step 8002 power is supplied to the transmission circuit 401-1 under the control of the power control circuit 403, and power is supplied to the reception circuit 407-1 under the control of the power control circuit 409. Therefore, the transmission circuit 401-1 and the reception circuit 407-1 are in a communicable state.
- the error rate is measured by the error rate measuring device 412.
- Propagation detection circuit 42 3 records the combination of the transmission circuit and the reception circuit and the error rate in association with each other.
- the power supply to the transmitting circuit 401-1 and the receiving circuit 407-1 is stopped under the control of the power control circuits 403 and 409.
- the propagation detection circuit 423 determines whether the measurement of the error rate has been completed for all combinations of the transmission circuit and the reception circuit. If there is a combination that has not been measured yet, in step 8005, the combination of the transmission circuit and the reception circuit is changed, and power is supplied to the transmission circuit and the reception circuit to operate them. Step 8 Return to 003 and measure the error rate.
- step 8006 the propagation detection circuit 423 determines the maximum error rate from the error rate recorded for the combination of the transmission circuit and the reception circuit. ⁇ Search for the combination of the transmission circuit and the reception circuit that had the error rate. That's the best! / ⁇ If the error rate is sufficient for communication, and it is determined that the error rate is low (low error rate), then in step 8007, the subsequent communication is performed using the combination of the transmission circuit and the reception circuit.
- control circuits 419 and 422 determine in step 8008 that the effect of multinos interference is strong, and set the selector 428 to the non-direct modulation mode and set the selector 428 to the non-direct modulation mode. Set 429 to non-direct demodulation mode.
- step 8009 the setting operation in the non-direct modulation / demodulation mode is performed.
- the user sets the wireless communication using the normal MIMO technology, or sets the symbol rate and the number of modulation levels using the procedures described in the first embodiment and its modifications. I do.
- the error rate is measured for all combinations of the transmission circuit and the reception circuit, but the error rate need not be measured for all combinations. If it is determined that a sufficiently good value is obtained from the measured error rate, it is possible to skip the subsequent error rate measurement and set communication in that combination. In addition, power consumption can be reduced by turning off the power of the transmission circuit and the reception circuit that are not used.
- the same effects as those described in the second embodiment and the modification can be obtained.
- the transmission circuit and the reception circuit are slightly complicated, the number of antennas can be reduced as compared with the second embodiment, and a switch is not required as compared with the modification of the second embodiment. Further, there is an advantage that a transmission amplifier of a transmission circuit connected to one antenna and a reception amplifier of a reception circuit can be integrated into one. [Fourth embodiment]
- FIG. 16 is a block diagram of a wireless communication device according to the fourth embodiment of the present invention.
- the radio communication apparatus according to the present embodiment employs a plurality of modulation units instead of modulation section 105, symbol rate setting section 117, and modulation mode setting section 118 in transmitter 100 according to the first embodiment shown in FIG. Unit 105—1—n and selector 116, and a plurality of demodulation units 120—11 and a selector 117 in place of the demodulation unit 120, symbol speed setting unit 122, and modulation mode setting unit 123 in the receiver 106. Things.
- Each of modulation sections 105-1-n has a different combination of symbol rate and modulation mode, and one of the outputs is selected by selector 116 under the control of control circuit 119.
- the demodulation sections 120-1-1 n have different combinations of symbol rates and demodulation modes, and one of the outputs is selected by the selector 117 under the control of the control circuit 124.
- Other configurations and operations of the wireless communication device according to the present embodiment are the same as those of the wireless communication device according to the first embodiment.
- FIG. 17 is a block diagram of a wireless communication device according to the fifth embodiment of the present invention.
- the radio communication apparatus according to the present embodiment includes a plurality of modulation sections 205 instead of modulation section 205, symbol rate setting section 217, and modulation mode setting section 218 in transmitting apparatus 200 according to the second embodiment shown in FIG. — 1—n and a selector 216, and a plurality of demodulators 220—11 and a selector 217 in place of the demodulator 220, symbol speed setting unit 222, and modulation mode setting unit 223 in the receiver 206. is there.
- the modulation sections 205-1-n have different combinations of symbol rates and modulation modes, and one of the outputs is selected by the selector 216 under the control of the control circuit 219.
- Each of the demodulation units 220-111 has a different combination of symbol rate and demodulation mode, and one of the outputs is selected by the selector 217 under the control of the control circuit 224.
- Other configurations and operations of the wireless communication device of the present embodiment are the same as those of the wireless communication device of the second embodiment.
- FIG. 18 is a block diagram of a modified example of the wireless communication device according to the fifth embodiment of the present invention.
- the wireless communication device according to the present embodiment is a modification of the second embodiment shown in FIG.
- a plurality of modulation sections 305-1-n and a selector 316 are provided instead of the modulation section 305, the symbol rate setting section 317, and the modulation mode setting section 318 in the transmitter 300, and the demodulation section 320 and the symbol rate setting in the receiver 306.
- a section 322 includes a plurality of demodulation sections 320-1-n and a selector 317 instead of the modulation mode setting section 323.
- Modulating sections 305-1-n have different combinations of symbol rates and modulation modes, and one of the outputs is selected by selector 316 under the control of control circuit 319.
- Each of the demodulation sections 320-111 has a different combination of symbol rate and demodulation mode, and one of the outputs is selected by the selector 317 under the control of the control circuit 324.
- Other configurations and operations of the wireless communication device according to the present modification are the same as those of the wireless communication device according to the modification of the second embodiment.
- FIG. 19 is a block diagram of a wireless communication device according to the sixth embodiment of the present invention.
- the radio communication apparatus according to the present embodiment includes a plurality of modulation units instead of modulation section 405, symbol rate setting section 417, and modulation mode setting section 418 in transmitter 400 according to the third embodiment shown in FIG.
- the receiver 406 comprises a plurality of demodulators 420-1-n and a selector 417 in place of the demodulator 420, the symbol speed setting unit 422, and the modulation mode setting unit 423 in the receiver 406. Things.
- Modulation sections 405-1-n have different combinations of symbol rates and modulation modes, and one of the outputs is selected by selector 416 under the control of control circuit 419.
- Each of the demodulation sections 420-11-n has a different combination of the symbol rate and the demodulation mode, and one of the outputs is selected by the selector 417 under the control of the control circuit 424.
- Other configurations and operations of the wireless communication device according to the present embodiment are the same as those of the wireless communication device according to the third embodiment.
- high-speed wireless communication is performed by detecting the state of signal propagation, such as the effect of multipath interference, and changing the symbol rate. It is possible to provide a wireless communication device having a function of reducing data.
- the opposite wireless communication device includes a transmitter and a receiver for the sake of explanation.
- the wireless communication device is generally referred to as the transmitter. It has both receivers.
- the antenna of the transceiver can be shared by a duplexer or a switch.
- the transmission signal / reception signal processing circuit has a function of serial-to-parallel conversion of data (or its inverse conversion). You may deal with it.
- an error rate measuring device is described in the above embodiment. This does not need to be configured by hardware, but it is sufficient if an error rate, a retransmission rate, or an index correlated with the error rate can be detected by software or the like instead. .
- the plurality of propagation detection units described here that is, the functions of the level detector, the error rate measurement device, and the output of the channel matrix are provided as needed, and it is not necessary to provide all of them. Furthermore, although not specifically described here, the increase in transmission capacity due to spatial multiplexing obtained by normal MIMO technology, the spatial diversity effect due to space-time coding, and the use of information on independent spatial transmission paths The optimal power distribution between the transmitters and the like described above can also be applied to the present embodiment. Further, in all the embodiments, for the sake of explanation, only three or four transceivers are described. However, this number is only required to be plural and is not particularly limited. What,
Abstract
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US10/594,444 US7924799B2 (en) | 2004-03-26 | 2005-03-09 | Radio communication device |
JP2006511423A JP4367659B2 (ja) | 2004-03-26 | 2005-03-09 | 無線通信機 |
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JP4367659B2 (ja) | 2009-11-18 |
US20070133493A1 (en) | 2007-06-14 |
US7924799B2 (en) | 2011-04-12 |
JP2009260993A (ja) | 2009-11-05 |
JPWO2005093982A1 (ja) | 2008-02-14 |
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