WO2009144930A1 - 無線通信装置 - Google Patents
無線通信装置 Download PDFInfo
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- WO2009144930A1 WO2009144930A1 PCT/JP2009/002339 JP2009002339W WO2009144930A1 WO 2009144930 A1 WO2009144930 A1 WO 2009144930A1 JP 2009002339 W JP2009002339 W JP 2009002339W WO 2009144930 A1 WO2009144930 A1 WO 2009144930A1
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- directivity
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- parameter
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
Definitions
- the present invention relates to a wireless communication device, and more particularly to a wireless communication device that changes the directivity characteristics of a variable directivity antenna device in accordance with fluctuations in a radio wave propagation environment.
- a network using wireless communication is superior in terms of portability of information terminals and freedom of arrangement compared to a network using wired communication.
- the information terminal can be reduced in weight by omitting a wired cable for connection between the information terminals.
- the wireless communication device is not only used for data transmission between conventional personal computers, but is also currently installed in many home appliances for transmitting video and audio data between the home appliances. Has come to be used.
- the wireless communication device has the advantages as described above, but radiates electromagnetic waves in the space for communication, so when it is installed in a space where many reflectors are installed, it is reflected on the object. Due to the influence of fading caused by the arriving delay wave, the transmission characteristics are deteriorated, and data transmission cannot be normally performed. Conventionally, as countermeasures against fading, control methods such as directivity control of transmission / reception antennas and various diversity processes have been proposed. For example, Patent Documents 1 to 3 describe wireless communication apparatuses according to the related art that receive wireless signals in accordance with time changes in a radio wave propagation environment.
- the receiving apparatus controls the propagation delay of the radio wave from the transmitting apparatus while controlling the combined directivity beam width of each antenna element of the variable directivity receiving antenna to be the widest.
- a measurement signal for requesting time is wirelessly received.
- the receiver separates the received measurement signal into a direct wave and a delayed wave, measures the delay time between the separated direct wave and each delayed wave component, and calculates the spread of the delayed time of each delayed wave component Then, based on the calculation result, the directivity pattern of the directivity variable reception antenna is controlled so that the reception sensitivity becomes dull with respect to the arrival direction of the delayed wave.
- the antenna selection diversity device described in Patent Document 2 includes a plurality of antennas, and the antenna information storage unit stores priority order data for selecting the plurality of antennas.
- the antenna selection unit controls the antenna selection switch so as to select a standby antenna different from the currently used antenna once every several frames in a steady state in which communication is performed using a specific antenna as the currently used antenna.
- the selected standby antenna becomes the measurement antenna.
- the standby antenna is sequentially selected as a measurement antenna according to the priority order data held in the antenna information storage unit.
- the antenna selection unit selects the antenna so that the measurement antenna is selected as the new current antenna. Control the switch. Otherwise, the same processing is repeated using the standby antenna of the next priority as the measurement antenna.
- the antenna selection diversity device described in Patent Document 3 is different from the antenna selection diversity device described in Patent Document 2, and each signal received by a plurality of diversity branches each having an antenna, a detector, and a correlation detector. Based on the above, the optimum antenna device is selected.
- Each correlation detector stores a known pattern of the frame synchronization signal from the transmission device in advance.
- Each correlation detector outputs a correlation coefficient between the signal received by each antenna and the known pattern of the frame synchronization signal to the signal processing device.
- the signal processing apparatus selects the diversity branch having the maximum correlation coefficient. Accordingly, it is possible to overcome multipath fading by adding simple hardware to the conventional antenna selection diversity and prevent a decrease in throughput.
- Japanese Unexamined Patent Publication No. 2000-134023 Japanese Patent Application Laid-Open No. 2005-142866. JP-A-8-172423.
- the transmission device in order to control the antenna directivity pattern so as to reduce the influence of delayed waves, the transmission device periodically transmits a measurement signal to the reception device. For this reason, in an environment where the time variation of the radio wave propagation environment is large, it is necessary to frequently transmit measurement signals in order to follow the variation, and the amount of control data other than the data to be transmitted / received increases, resulting in an increase in throughput. Led to a decline.
- the measurement signal in Patent Document 1 is not transmitted, but even in a steady state where the currently used antenna is determined, communication is performed by periodically switching to another standby antenna, Since it is necessary to obtain the reception level, unnecessary antenna control occurs and throughput may be reduced.
- An object of the present invention is to solve the above problems and provide a wireless communication device capable of transmitting and receiving a data signal at higher speed and more stably than in the prior art even when the radio wave propagation environment fluctuates.
- a wireless communication apparatus includes at least one variable directivity antenna element, and has a plurality of combined directivity characteristics obtained by superimposing the directivity characteristics of the at least one variable directivity antenna element; , Pre-stored combined directional characteristic classification information in which each of the combined directional characteristics is classified into a plurality of combined directional characteristic groups set using a first parameter indicating a quality level of a radio signal received by the variable directional antenna device.
- Storage means for Based on the first parameter and the second parameter indicating the quality level of the radio signal and different from the first parameter, one combined directional characteristic is selected from the plurality of combined directional characteristics, And control means for controlling the combined directivity of the variable directivity antenna device so as to have the selected combined directivity.
- the control means includes (A) When the variable directional antenna device is controlled to have a predetermined one of the plurality of combined directivity characteristics, the first parameter is measured, and the measured first Based on the parameters of the above, with reference to the composite directional pattern classification information, one composite directional pattern group is selected from the plurality of composite directional pattern groups, (B) When the variable directivity antenna device is controlled to have each combined directivity included in the selected combined directivity group, the second parameter relating to each combined directivity is measured, Based on each of the measured second parameters, one combined directional pattern is selected from the combined directional patterns included in the selected combined directional pattern group, (C) The variable directivity antenna device is controlled to have the selected combined directivity characteristic.
- the control means measures a third parameter indicating the quality level of the wireless signal when the variable directional antenna apparatus is controlled to have the selected combined directivity characteristic. And determining whether or not the measured third parameter is less than or equal to a predetermined first threshold, and detecting that the measured third parameter is less than or equal to the first threshold. In some cases, the variable directivity antenna device is controlled to have a combined directivity characteristic different from the selected composite directivity characteristic.
- variable directivity antenna apparatus is controlled to have a combined directional characteristic different from the selected combined directional characteristic.
- the control means when the control means controls the variable directivity antenna device so as to have the selected combined directivity characteristic, the control means measures the first parameter and starts the control.
- a reference first parameter is calculated based on the first parameter measured immediately thereafter, a latest first parameter is calculated based on the first parameter measured immediately before the detection, and the calculated first parameter is calculated.
- the other one of the plurality of combined directivity characteristics is When the composite directivity is selected and the magnitude of the difference between the calculated first parameter of the reference and the latest first parameter is less than a predetermined second threshold, the selected Composite directivity group Included in the flop and characterized by selecting said another synthetic directional characteristic from the combined directivity characteristics other than synthetic directional characteristic is the selected.
- the third parameter is the same as the second parameter.
- the predetermined one combined directional characteristic is substantially non-directional.
- the first parameter indicates a received signal level of the wireless signal.
- the combined directional characteristic classification information includes, for each combined directional characteristic, the directional characteristic data of the variable directional antenna elements and the combined directional characteristic among the plurality of combined directional characteristic groups. Including data of a composite directional characteristic group including
- each combined directional characteristic is classified into a plurality of combined directional characteristic groups set using the first parameter indicating the quality level of the radio signal received by the variable directional antenna apparatus.
- Storage means for storing the combined directional characteristic classification information in advance, a first parameter, and a second parameter that indicates the quality level of the radio signal and is different from the first parameter.
- a control means for controlling the combined directivity of the variable directivity antenna apparatus so as to have the selected combined directivity. Therefore, even when the radio wave propagation environment fluctuates, the data signal can be transmitted and received stably at a higher speed than in the prior art.
- FIG. 3 is a diagram illustrating an example of composite directivity characteristics Pa to Pf in the composite directivity characteristic table of FIG. 2;
- 2 is a flowchart showing directivity control processing executed by a controller 2 in FIG. 1. It is a flowchart which shows the synthetic
- FIG. 1 is a block diagram showing a configuration of a wireless communication apparatus 1 according to the first embodiment of the present invention.
- the combined directivity table memory 2m stores the combined directivity classification information of the variable directivity antenna device 10 in a table format including the combined directivity classification information.
- FIG. 2 is a diagram showing an example of a combined directional characteristic table stored in the combined directional characteristic table memory 2m of FIG.
- FIG. 3 is a diagram showing an example of the combined directivity characteristics Pa to Pf in the composite directivity characteristic table of FIG.
- FIG. 4 is a flowchart showing directivity control processing executed by the controller 2 of FIG. 1.
- FIGS. 5 to 7 respectively show the composite directivity group selection processing S2 and the composite directivity selection processing S4 of FIG. And a reference RSSI (RSSIr) calculation process S7.
- the configuration of the wireless communication device 1 in FIG. 1 is applied to the following embodiments and modifications.
- the wireless communication device 1 includes a plurality of N variable directional antenna elements 4-1 to 4-N, and each directional characteristic of the variable directional antenna elements 4-1 to 4-N. And a received signal strength display (Received Signal) which is a first parameter indicating a received signal level of a radio signal received by the variable directional antenna device 10. Strength Indicator; hereinafter referred to as RSSI) and a packet error rate (Packet Error Rate; hereinafter referred to as PER) that is a second parameter indicating the quality level of the radio signal.
- the controller 2 for controlling the combined directional characteristics of the directional characteristics of the variable directional antenna elements 4-1 to 4-N for each of the combined directional characteristics.
- synthetic directional characteristic classification information which is data of a synthetic directional characteristic group including the synthetic directional characteristic among a plurality of synthetic directional characteristic groups (strong electric field group and weak electric field group) set using RSSI.
- a composite directivity table memory 2m for storing a composite directivity table in advance.
- the controller 2 measures the RSSI by controlling the variable directional antenna device 10 so as to have the combined directional characteristic Pa among the plurality of combined directional characteristics (step S21 in FIG. 5), and measures the measured RSSI.
- one composite directivity group is selected from the plurality of composite directivity groups (composite directivity group selection processing in FIG. 5), and the selected combination is selected.
- variable directional antenna device 10 When the variable directional antenna device 10 is controlled so as to have each combined directivity characteristic included in the directivity group, the PER related to each combined directivity characteristic is measured, and the selection is performed based on each measured PER.
- One synthetic directional characteristic is selected from the synthetic directional characteristics included in the synthesized synthetic directional characteristic group (the synthetic directional characteristic selection process in FIG. 6). ), It is characterized in controlling a variable directional antenna device 10 to have the selected synthetic directional characteristic (step S6 in FIG. 4).
- the controller 2 measures PER when controlling the variable directivity antenna device 10 so as to have the selected combined directivity characteristic, and whether or not the measured PER is less than a predetermined threshold PER2. (Step S12 in FIG. 4), and when it is detected that the measured PER is equal to or greater than a predetermined threshold PER2, the composite directivity characteristic different from the selected composite directivity characteristic is selected.
- the variable directional antenna device 10 is controlled.
- variable directional antenna device 10 is controlled so as to have a combined directional characteristic different from the selected combined directional characteristic.
- the controller 2 measures the RSSI when controlling the variable directional antenna device 10 to have the selected combined directional characteristics, and based on the RSSI measured immediately after the start of the control, the reference RSSI (RSSIr) is calculated (reference RSSI (RSSIr) calculation processing in FIG. 7), the average RSSIb of the latest RSSI is calculated based on the RSSI measured immediately before the detection, and the reference RSSI (RSSIr) and RSSIb are calculated. Is equal to or greater than a predetermined threshold value ⁇ Rc (YES in step S16 in FIG. 4), the other combined directional characteristic is selected from all the combined directional characteristics, and the reference RSSI is selected.
- a predetermined threshold value ⁇ Rc YES in step S16 in FIG. 4
- a MIMO communication system wireless communication device 1 wirelessly receives a data signal such as video / audio data packet-transmitted from another wireless communication device via a variable directional antenna device 10.
- the wireless communication device 1 includes a variable directional antenna device 10, a plurality of N high frequency processing circuits 5-1, 5-2,..., 5-N, a baseband processing circuit 6, and a MAC (Media Access). Control) processing circuit 7, controller 2 for controlling the operation of these devices and circuits 5-1, 5-2,..., 5-N, 6, 7 and 10, and a plurality of combinations of variable directivity antenna devices 10.
- a combined directivity characteristic table memory 2m for storing the directivity characteristics Pa to Pf in advance.
- a variable directional antenna device 10 includes a plurality of N variable directional antenna elements 4-1, 4-2,..., 4-N and variable directional antenna elements 4-1, 4-2. .., 4-N, and a plurality of N directional controllers 3-1, 3-2,.
- the directivity controllers 3-1 to 3-N include reactance elements connected to the variable directivity antenna elements 4-1 to 4-N, respectively, and the reactance values of the reactance elements are calculated based on the control signal from the controller 2. By changing the electric length of each of the variable directivity antenna elements 4-1 to 4-N, the directivity characteristics of the variable directivity antenna elements 4-1 to 4-N are controlled.
- Each of the radio signals received by the variable directional antenna elements 4-1, 4-2,..., 4-N is input to the high frequency processing circuits 5-1, 5-2,.
- the directivity obtained by superimposing the directivity of the variable directivity antenna elements 4-1, 4-2,..., 4-N is referred to as the combined directivity of the variable directivity antenna device 10.
- high-frequency processing circuits 5-1, 5-2,..., 5-N respectively include a high-frequency bandpass filter that performs a predetermined bandpass process on the input radio signal, and a post-bandpass process.
- a low noise amplifier that amplifies the radio signal
- a direct conversion demodulator that directly demodulates the amplified radio signal into a baseband signal
- a baseband filter that performs predetermined bandpass processing on the baseband signal
- the high frequency processing circuits 5-1, 5-2,..., 5-N output the baseband signals after the band pass processing to the controller 2 and the baseband processing circuit 6, respectively.
- the baseband processing circuit 6 is controlled so that the signal level of each baseband signal input from the high frequency processing circuits 5-1, 5-2,.
- the baseband processing circuit 6 calculates an RSSI associated with each baseband signal based on each AGC voltage that is a control voltage output from each AGC circuit when a data packet is received, and an average value of each RSSI Is calculated and output to the controller 2.
- the baseband processing circuit 6 calculates a total transmission signal power-to-noise ratio (hereinafter referred to as Signal Noise Ratio; hereinafter referred to as SNR) related to each baseband signal at the time of receiving a data packet, and averages each SNR. The value is calculated and output to the controller 2.
- the MAC processing circuit 7 determines whether or not the data packet is addressed to the wireless communication device 1 based on the data packet included in the decoded signal. A predetermined MAC process is performed on the decoded signal from the wireless communication apparatus 1 and then output as an output signal from the wireless communication apparatus 1. Further, when receiving the first data packet, the MAC processing circuit 7 outputs a packet communication start notification signal for notifying the start of packet reception to the controller 2, while when receiving the last data packet, the packet reception is completed. Is output to the controller 2.
- SNR Signal Noise Ratio
- the controller 2 calculates PER based on the SNR from the baseband processing circuit 6 using a predetermined conversion formula between the SNR and PER. Further, the controller 2 selects one combined directional characteristic from among the combined directional characteristics Pa to Pf by executing a directional characteristic control process described later in detail with reference to FIGS. 4 to 7. Further, the controller 2 uses the directivity controllers 3-1 to 3 -N to change the variable directivity antenna elements 4-1 to 4 -N so that the variable directivity antenna device 10 has the selected combined directivity characteristic. Control each directional characteristic.
- the combined directivity table memory 2m includes the combined directivity characteristics Pa to Pf of the variable directivity antenna device 10 and two composite directivity groups (strong electric field group and weak electric field group) classified according to RSSI. A composite directivity characteristic table showing the relationship between them is stored.
- the combined directivity characteristics Pa to Pf include the directivity characteristics of the variable directivity antenna elements 4-1 to 4-3, respectively.
- the combined directivity table memory 2m stores data related to control signals output from the controller 2 to the directivity controllers 3-1 to 3-3 for each directivity of the variable directivity antenna elements 4-1 to 4-3.
- the composite directivity characteristic Pa is an initial composite directivity characteristic described later in detail, and is included in the weak electric field group.
- the variable directional antenna elements 4-1 to 4-3 have directional characteristics Pa1 to Pa3, respectively.
- the combined directivity characteristic Pb is included in the strong electric field group and the weak electric field group, and the variable directivity antenna elements 4-1 to 4-3 have directivity characteristics Pb1 to Pb3, respectively.
- the combined directivity characteristic Pc is included in the strong electric field group and the weak electric field group, and the variable directivity antenna elements 4-1 to 4-3 have directivity characteristics Pc1 to Pc3, respectively.
- the combined directivity characteristic Pd is included in the strong electric field group, and the variable directivity antenna elements 4-1 to 4-3 have directivity characteristics Pd1 to Pd3, respectively.
- the combined directional characteristic Pe is included in the strong electric field group, and the variable directional antenna elements 4-1 to 4-3 have directional characteristics Pe1 to Pe3, respectively.
- the combined directivity characteristic Pf is included in the strong electric field group, and the variable directivity antenna elements 4-1 to 4-3 have directivity characteristics Pf1 to Pf3, respectively.
- each of the variable directivity antenna elements 4-1 to 4-3 has substantially non-directional directivity characteristics Pa1 to Pa3.
- the variable directional antenna element 4-1 has a directional characteristic Pb1 having a beam width of about 90 degrees and a beam azimuth angle of about 220 degrees, and the variable directional antenna element 4-2 is about 90 degrees.
- a directional characteristic Pb2 having a beam azimuth angle of about 100 degrees
- the variable directional antenna element 4-3 has a directional characteristic Pb3 having a beam width of about 90 degrees and a beam azimuth angle of about 340 degrees.
- variable directional antenna element 4-1 has a directional characteristic Pc1 having a beam width of about 90 degrees and a beam azimuth of about 230 degrees, and the variable directional antenna element 4-2 is about
- the directional characteristic Pc2 has a beam width of 90 degrees and a beam azimuth angle of about 130 degrees
- variable directional antenna element 4-3 has a directional characteristic Pb3 having a beam width of about 120 degrees and a beam azimuth angle of about 0 degrees.
- variable directional antenna element 4-1 has a directional characteristic Pd1 having a beam width of about 70 degrees and a beam azimuth angle of about 225 degrees, and the variable directional antenna element 4-2 is about Approx.
- the directional characteristic Pd2 has a beam width of 70 degrees and a beam azimuth angle of about 135 degrees, and the variable directional antenna element 4-3 has a directional characteristic Pd3 having a beam width of about 70 degrees and a beam azimuth angle of about 0 degrees.
- variable directional antenna element 4-1 has a directional characteristic Pe1 having a beam width of about 70 degrees and a beam azimuth angle of about 215 degrees
- variable directional antenna element 4-2 is The directional characteristic Pe2 has a beam width of about 70 degrees and a beam azimuth of about 115 degrees
- variable directional antenna element 4-3 has a beam width of about 70 degrees and a beam azimuth of about 340 degrees. Pe3.
- variable directional antenna element 4-1 has a directional characteristic Pf1 having a beam width of about 70 degrees and a beam azimuth angle of about 250 degrees
- variable directional antenna element 4-2 is about
- the directional characteristic Pf2 has a beam width of 70 degrees and a beam azimuth angle of about 140 degrees
- the variable directional antenna element 4-3 has a directional characteristic Pf3 having a beam width of about 70 degrees and a beam azimuth angle of about 20 degrees.
- the composite directivity characteristic Pa is substantially non-directional.
- the beam widths of the directivity characteristics Pb1 to Pb3 and Pc1 to Pc3 of the variable directivity antenna elements 4-1 to 4-3 are substantially the same.
- the beam widths of the directivity characteristics Pd1 to Pd3, Pe1 to Pe3, and Pf1 to Pf3 of the variable directivity antenna elements 4-1 to 4-3 are substantially the same.
- the beam widths of the variable directivity antenna elements 4-1 to 4-3 in the combined directivity characteristics Pb and Pc are narrower than the beam widths of the directivity characteristics Pb1 to Pb3 and Pc1 to Pc3. That is, the combined directivity characteristics Pd to Pf are higher in directivity than the combined directivity characteristics Pb and Pc.
- the controller 2 sets each of the variable directivity antenna elements 4-1 to 4-N so that the variable directivity antenna apparatus 10 has the initial combined directivity characteristic Pa in a reception standby state in which no data packet is received. Control directivity.
- step S1 of the directivity control process in FIG. 4 it is determined whether or not a packet communication start notification signal has been received from the MAC processing circuit 7. If YES, the process proceeds to the combined directivity group selection process in step S2. On the other hand, if NO, the process returns to step S1.
- step S21 of the combined directional pattern group selection process in FIG. 5 the variable directional antenna apparatus 10 has an initial combined directional pattern Pa that is closest to the omnidirectional among the combined directional patterns Pa to Pf. Each directional characteristic of the elements 4-1 to 4-N is controlled.
- step S22 zero is substituted for the packet number P
- a data packet is received in step S23, and 1 is added to the packet number P in step S24.
- step S25 after the RSSI input from the baseband processing circuit 6 is stored, the process proceeds to step S26.
- step S26 it is determined whether or not the number of packets P is equal to or greater than a predetermined number of packets P1.
- step S27 the average value RSSIa of the P1 RSSIs stored is calculated, and in step S28, it is determined whether or not the calculated average value RSSIa is smaller than a predetermined threshold value Rp. If YES in step S28, the process proceeds to step S29 to select a weak electric field group in the combined directivity table memory 2m and return to the directivity control process in FIG. On the other hand, if NO in step S28, the process proceeds to step S30, where a strong electric field group in the combined directivity table memory 2m is selected, and the process returns to the directivity control process of FIG.
- step S3 In the first candidate setting process of step S3, referring to the combined directional pattern table, all combined directional patterns included in the combined directional pattern group selected by the combined directional pattern group selecting process are set as combined directional pattern candidates. Then, the process proceeds to the composite directivity characteristic selection process in step S4.
- step S32 the first candidate is selected from the combined directivity characteristic candidates.
- step S33 the variable directivity antenna element 4- is selected so that the variable directivity antenna apparatus 10 has the selected combined directivity characteristic candidate.
- the directivity characteristics 1 to 4-N are controlled, and the process proceeds to step S34.
- step S34 the data packet is received, and in step S35, PER is calculated based on the SNR input from the baseband processing circuit 6, and stored. Further, in step S36, it is determined whether or not the currently selected composite directivity characteristic is the last composite directivity characteristic candidate. If NO, the process proceeds to step S37 to select the next composite directivity characteristic candidate. Return to S33.
- step S36 1 is added to the packet number P in step S38, and it is determined in step S39 whether the packet number P is equal to or greater than the predetermined packet number P2. If NO in step S39, the process returns to step S32. If YES, the process proceeds to step S40.
- step S41 the calculated average value of PER is the largest.
- the composite directivity characteristic is deleted from the composite directivity characteristic candidates, and the process proceeds to step S42.
- step S42 it is determined whether or not the number of the remaining combined directivity characteristic candidates is one. If YES, the process proceeds to step S43. If NO, the process proceeds to step S45.
- step S43 the last remaining combined directional characteristic candidate is selected.
- step S44 1 is substituted into a flag IF indicating whether or not the combined directional characteristic has been selected, and the process returns to the directional characteristic control process of FIG. .
- step S45 the combined directional characteristic candidates whose calculated PER average value is equal to or greater than the predetermined threshold PER1 are deleted from the candidates.
- step S46 the number of the remaining combined directional characteristic candidates is one. It is determined whether or not. If YES in step S46, the process proceeds to step S43. If NO, the process proceeds to step S47. Further, in step S47, it is determined whether or not the number of currently remaining composite directivity characteristic candidates is zero. If NO, the process returns to step S31, whereas if YES, the process proceeds to step S48. In step S48, 0 is substituted for the flag IF, and the process returns to the directivity control process of FIG.
- step S5 determines whether or not the flag IF is 1 (that is, whether or not the composite directivity has been selected). If NO, the composite directivity of step S2 is determined. While returning to the characteristic group selection process, the process proceeds to step S6 if YES.
- the processing in steps S6 to S14 is steady when packet communication is performed when the variable directivity antenna apparatus 10 is controlled to have the combined directivity selected by the combined directivity selection process. It is a reception process in a state.
- step S6 of FIG. 4 the directivity characteristics of the variable directivity antenna elements 4-1 to 4-N are controlled so that the variable directivity antenna apparatus 10 has the selected combined directivity characteristics, and the reference RSSI in step S7 is performed.
- the process proceeds to (RSSIr) calculation processing.
- step S51 of the reference RSSI (RSSIr) calculation process of FIG. 7 zero is substituted for the packet number P, and after receiving the data packet in step S52, 1 is added to the packet number P in step S53.
- step S54 the RSSI input from the baseband processing circuit 6 is stored, and then the process proceeds to step S55.
- step S55 it is determined whether or not the number of packets P is equal to or greater than the predetermined number of packets P3. If NO, the process returns to step S52. If YES, the process proceeds to step S56.
- step S56 the average value of the stored P3 RSSIs is calculated as the reference RSSI (RSSIr), and the process returns to the directivity control process of FIG.
- step S10 the RSSI input from the baseband processing circuit 6 is stored, and the PER is calculated and stored based on the SNR input from the baseband processing circuit 6, and the process proceeds to step S11.
- step S11 it is determined whether or not a packet communication end notification signal has been received from the MAC processing circuit 7. If YES, the process returns to step S1, while if NO, the process proceeds to step S12.
- step S12 it is determined whether or not the latest PER is smaller than a predetermined threshold value PER2.
- step S13 1 is added to the number of packets Pe, and the process proceeds to step S14.
- step S14 it is determined whether or not the number of packets Pe is equal to or greater than a predetermined threshold value Pec. If NO, the process returns to step S9. If YES, the process proceeds to step S15. That is, when the signal quality level of the radio signal is lowered due to a change in the radio wave propagation environment and the PER is continuously lower than the predetermined threshold PER2 by the predetermined number of packets Pec, the reception process in the steady state is performed. End and proceed to step S15.
- step S16 it is determined whether the magnitude of the difference between the RSSI average value RSSIb and the reference RSSIr in the steady state is equal to or greater than a predetermined threshold value ⁇ Rc. If YES, the process returns to step S2. If NO, the process proceeds to step S17. In the second candidate setting process of step S17, with reference to the combined directional characteristic table, a combined directional characteristic other than the selected combined directional characteristic included in the currently selected combined directional characteristic group is selected as a combined directional characteristic candidate. And return to step S4.
- the controller 2 first selects a strong electric field group or a weak electric field group based on RSSI indicating the signal level of the radio signal by the combined directivity group selection process (step S2).
- one combined directional characteristic is selected from the combined directional characteristics in the selected combined directional characteristic group based on the PER indicating the signal quality level of the radio signal by the combined directional characteristic selection process (step S4),
- the process proceeds to the reception process (steps S4 to S14) in the state.
- the reference RSSI The reference RSSI (RSSIr) in the steady state is calculated by (RSSIr) calculation processing (step S7). Then, based on the time change of the PER, the signal quality level of the radio signal has decreased to a predetermined level due to a change in the radio wave propagation environment, etc., compared to when the reception process in the steady state is started (step S6). If detected (step S14), the reception process in the steady state is terminated.
- the controller 2 determines whether or not the difference between the reference RSSI (RSSIr) in the steady state and the average RSSIr of the latest RSSI is equal to or greater than a predetermined threshold value ⁇ Rc (step S16).
- a momentary and minute change in the radio wave propagation environment occurs, such as a change in the radio wave propagation environment when a person crosses the radio wave propagation path
- the latest RSSI average value RSSIb and the reference RSSI (RSSIr) ) Is less than a predetermined threshold value ⁇ Rc
- the controller 2 is included in the currently selected combined directional pattern group and is selected from the combined directional patterns other than the selected combined directional pattern.
- Another composite directivity characteristic is selected by the composite directivity characteristic selection process (steps S17, S4, S5).
- the magnitude of the difference between the latest RSSI average value RSSIb and the reference RSSI (RSSIr) is equal to or greater than a predetermined threshold value ⁇ Rc.
- Another composite directivity characteristic is selected from all the composite directivity characteristics Pa to Pf in the directivity characteristic table memory 2m (steps S2 to S5).
- step S6 in FIG. 4 switches the combined directivity characteristics of the variable directivity antenna apparatus 10 in packet communication. It is performed at a timing at which a necessary time period can be secured. For example, in the time period until the wireless communication device 1 transmits a packet including an acknowledgment signal for the received data packet to the wireless communication device on the transmission side and receives the next data packet, the variable directional antenna device It is only necessary to switch 10 synthetic directivity characteristics.
- step S3 first candidate setting process
- step S3 first candidate setting process
- step S3 second candidate setting process
- the combined directional characteristics Pa to Pc included in the weak electric field group are set as combined directional characteristic candidates.
- the combined directional characteristic selection process of FIG. 6 while changing the combined directional characteristic among the combined directional characteristics Pa, Pb, and Pc for each packet, for each combined directional characteristic, only a predetermined number of packets P2 is used. Store the PER.
- an average value of the stored P2 PERs is calculated for each of the combined directivity characteristics Pa, Pb, and Pc.
- the average value of PER related to the combined directional characteristic Pc is the largest, the combined directional characteristic Pc is deleted from the combined directional characteristic candidates.
- the average value of PERs related to the remaining combined directivity characteristic Pa and Pb is less than the predetermined threshold PER1, while changing the composite directivity characteristic between the composite directivity characteristics Pa and Pb for each packet.
- PER is stored for a predetermined number of packets P2.
- an average value of the stored P2 PERs is calculated for each of the combined directivity characteristics Pa and Pb.
- the average value of the PER related to the combined directional characteristic Pa is larger than the average value of the PER related to the combined directional characteristic Pb, the combined directional characteristic Pb is selected, and the combined directional characteristic selection process is terminated.
- each directional characteristic of the variable directional antenna elements 4-1 to 4-N is controlled so that the variable directional antenna apparatus 10 has the combined directional characteristic Pb.
- the reference RSSI (RSSIr) is calculated.
- the reception process in the steady state is performed. finish.
- the magnitude of the difference between the reference RSSI (RSSIr) and the RSSI average value RSSIb in the latest Pec data packets is less than the predetermined threshold ⁇ Rc, it is included in the weak electric field group and is currently selected.
- the combined directional characteristics Pa and Pc other than the combined directional pattern Pb are set as combined directional characteristics candidates. Further, the composite directivity characteristic is selected again from the composite directivity characteristic candidates Pa and Pc by the composite directivity characteristic selection process.
- the wireless communication device 1 in a reception process in a steady state in which the variable directivity antenna device 10 is controlled to have the combined directivity selected in the combined directivity selection process, a data packet is received. Based on PER, which is the signal quality level of the radio reception signal, it is determined whether or not the quality level of the radio reception signal has decreased to a predetermined level or less. Therefore, unlike the antenna directivity control system described in Patent Document 1, it is not necessary to perform transmission / reception of measurement signals and antenna control for detecting a change in radio wave propagation environment in a steady state, and a decrease in throughput can be avoided.
- PER which is the signal quality level of the radio reception signal
- control is performed such that the combined directional characteristics of the variable directivity antenna device 10 are changed only when the quality level of the radio reception signal is lowered to a predetermined level, which is compared with the antenna selection diversity device described in Patent Document 2. Unlike this, it is not necessary to perform antenna control for detecting a change in the radio wave propagation environment, and a reduction in throughput can be avoided. Therefore, according to the wireless communication device 1 according to the present embodiment, data signals can be transmitted and received at high speed and stably even when the radio wave propagation environment fluctuates, as compared with the prior art.
- the controller 2 determines that the difference between the reference RSSI (RSSIr) and the latest RSSI is equal to or greater than the predetermined threshold value ⁇ Rc.
- the selection process step S2
- the first candidate setting process step S3
- the combined directional pattern selection process step S4
- another combined directional pattern is selected, and the magnitude of the difference is
- the second candidate setting process step S17
- the composite directivity characteristic selection process step S4
- FIG. 8 is a flowchart showing the combined directivity characteristic selection process S4A according to the first modification of the first embodiment of the present invention.
- the combined directional characteristic selection process S4 (FIG. 6) executed by the controller 2 in FIG. 1 is replaced with a combined directional characteristic selection process S4A. is there.
- step S32 the first candidate is selected from the combined directivity characteristic candidates.
- step S33 the variable directivity antenna apparatus 10 has the selected combined directivity characteristic candidates so that the variable directivity is selected.
- the directivity characteristics of the directional antenna elements 4-1 to 4-N are controlled.
- step S31 zero is substituted for the packet number P.
- step S34 the data packet is received, and in step S35, PER is calculated based on the SNR input from the baseband processing circuit 6, and stored. Further, in step S38, 1 is added to the packet number P, and in step S39, it is determined whether or not the packet number P is equal to or greater than a predetermined packet number P2. If NO in step S39, the process returns to step S34.
- step S36 it is determined whether or not the currently selected combined directional characteristic is the last combined directional characteristic candidate. If NO, the process proceeds to step S37 to select the next combined directional characteristic candidate. Return to S33. On the other hand, if YES in step S36, the process proceeds to step S40. After Step S40, the same processing as Steps S40 to S47 in the combined directivity characteristic selection processing S4 of FIG. 6 is performed.
- the first modification has the same effects as those of the first embodiment described above.
- FIG. 9 is a flowchart showing the combined directivity characteristic selection process S4A according to the second modification of the first embodiment of the present invention.
- the combined directivity characteristic selection process S4 (FIG. 6) executed by the controller 2 in FIG. 1 is replaced with a composite directivity characteristic selection process S4B. is there.
- steps S31 to S40 are performed in the same manner as the composite directivity characteristic selection process S4 of FIG. Subsequently to step S40, a combined directivity characteristic candidate having the smallest PER average value is selected in step S49, and 1 is substituted into a flag IF indicating whether or not the combined directivity characteristic has been selected in step S44. Returning to the directivity control process 4.
- step S4B Since the combined directivity characteristic selection process S4B according to the second modified example is compared with the composite directivity characteristic selection process S4 according to the first embodiment, steps S41 to S48 are replaced with steps S44 and S49. Characteristic candidates can be selected quickly and reliably. Furthermore, since the combined directivity characteristic candidate can be selected without fail, the determination process in step S5 in FIG. 4 can be omitted.
- FIG. 10 is a flowchart showing the combined directivity characteristic selection process S4A according to the third modification of the first embodiment of the present invention.
- the third modification is obtained by replacing the combined directional characteristic selection process S4B (FIG. 9) executed by the controller 2 of FIG. 1 with a combined directional characteristic selection process S4C. .
- step S32 the first candidate is selected from the combined directional pattern candidates, and in step S33, The directivity characteristics of the variable directivity antenna elements 4-1 to 4-N are controlled so that the variable directivity antenna apparatus 10 has the selected combined directivity characteristic candidates.
- step S31 zero is substituted for the packet number P.
- step S34 the data packet is received, and in step S35, PER is calculated based on the SNR input from the baseband processing circuit 6, and stored. Further, in step S38, 1 is added to the packet number P, and in step S39, it is determined whether or not the packet number P is equal to or greater than a predetermined packet number P2.
- step S39 the process returns to step S34. If YES, the process proceeds to step S36. In step S36, it is determined whether or not the currently selected combined directional characteristic is the last combined directional characteristic candidate. If NO, the process proceeds to step S37 to select the next combined directional characteristic candidate. Return to S33. On the other hand, if YES in step S36, the process proceeds to step S40. In step S40, based on the stored PER, an average value of the stored P2 PERs is calculated for each combined directivity characteristic candidate.
- step S40 a combined directional pattern candidate having the smallest PER average value is selected in step S49, and in step S44. Then, 1 is substituted into the flag IF indicating whether or not the combined directional characteristic has been selected, and the process returns to the directional characteristic control process of FIG.
- the third modification has the same effect as the second modification.
- FIG. 11 is a flowchart showing directivity control processing according to the second embodiment of the present invention.
- the directivity control process according to the present embodiment replaces the PER that is the second parameter during the reception process in the steady state, as compared with the directivity control process according to the first embodiment (see FIG. 4). It is characterized in that a PHY rate that is a third parameter that is a quality level of a radio signal received by the variable directivity antenna device 10 is measured.
- the composite directivity characteristic selection process of FIG. 11 is obtained by replacing the processes of steps S10 and S12 of the composite directivity characteristic process of FIG. 4 with the processes of step S10A and step S12A, respectively.
- the baseband processing circuit 6 calculates a physical transmission rate (hereinafter referred to as a PHY rate) of a packet related to each baseband signal when receiving a data packet, and calculates an average value of each PHY rate.
- a PHY rate a physical transmission rate
- the terminal that transmits the packet changes the packet PHY rate according to the past transmission status. Decide and send.
- the terminal that receives the packet needs information on the PHY rate of the packet, that is, the modulation scheme and coding rate, in order to correctly demodulate the received signal.
- a terminal that transmits a packet adds information on the PHY rate of the packet to a signal area at the head of the packet so that the receiving terminal can demodulate the signal.
- the baseband processing circuit 6 calculates the PHY rate related to each baseband signal by processing the signal region of the packet reception signal.
- the controller 2 stores the RSSI and PHY rate input from the baseband processing circuit 6.
- This embodiment has the same effect as the first embodiment.
- FIG. 12 is a conceptual diagram showing the combined directional characteristic classification information stored in the combined directional characteristic table memory 2m in the first modification of the second embodiment of the present invention.
- the combined directivity characteristic table memory 2m stores the combined directivity characteristic classification information of the variable directivity antenna device 10 in a table format including the combined directivity characteristic classification information.
- the combined directional characteristic table memory 2m stores the combined directional characteristic classification information of the variable directional antenna device 10 in a three-layer tree format including the combined directional characteristic classification information. .
- This modification has the same effect as the first embodiment and the second embodiment.
- FIG. 13 is a conceptual diagram showing the combined directional characteristic classification information stored in the combined directional characteristic table memory 2m in the third embodiment of the present invention.
- 14 and 15 are flowcharts showing directivity control processing according to the third embodiment of the present invention.
- the present embodiment is characterized in that the combined directional characteristic classification information of the variable directivity antenna device 10 is stored in a four-layer tree format including the combined directional characteristic classification information. .
- the combined directional characteristic table memory 2m stores the combined directional characteristic classification information of the variable directional antenna device 10 in a four-layer tree format including the combined directional characteristic classification information.
- the combined directional characteristics Pa to Pp are classified into a group A including the combined directional characteristics Pa to Ph and a group B including the combined directional characteristics Pi to Pp.
- the combined directivity characteristics Pa to Ph included in the group A are classified into a subgroup A1 including the combined directivity characteristics Pa to Pd and a subgroup A2 including the combined directivity characteristics Pe to Ph.
- the combined directivity characteristics Pi to Pp included in the group B are classified into a subgroup B1 including the combined directivity characteristics Pi to Pl and a subgroup B2 including the combined directivity characteristics Pm to Pp.
- the combined directional characteristic Pa is a first initial combined directional characteristic
- the combined directional characteristics Ph and Pp are second initial combined directional characteristics.
- the baseband processing circuit 6 receives the data packet using the variable directional antenna element 4-1, based on each AGC voltage that is a control voltage output from each AGC circuit.
- the RSSI 1 related to the baseband signal of the radio signal and the RSSI2 related to the baseband signal of the radio signal received using the variable directivity antenna element 4-2 are calculated and output to the controller 2.
- step S1 in FIG. 14 it is determined whether or not a packet communication start notification signal has been received from the MAC processing circuit 7. If YES, the process proceeds to the combined directivity group selection process in step S2A. If NO, step S1 is performed. Return to.
- step S2A the “initial combined directional pattern Pa” in step S21 is replaced with the “first initial combined directional pattern Pa” in the combined directional pattern group selecting process in FIG. “RSSI” is replaced with “RSSI1”, “weak electric field group” in step S29 is replaced with “group A”, and “strong electric field group” in step S30 is replaced with “group B”. That is, group A or group B is selected based on RSSI 1 by the combined directivity group selection processing.
- step S2B the composite directivity characteristic subgroup selection process in step S2B is executed.
- a subgroup in the group selected in step S2A is selected based on RSSI2 as in the combined directivity characteristic group selection process in step S2A. For example, when group A is selected in step S2A, subgroup A1 or A2 is selected based on RSSI2 using second initial combined directivity characteristic Ph.
- group B is selected in step S2A, subgroup B1 or B2 is selected based on RSSI2 using second initial combined directivity characteristic Pp.
- step S3A all the combined directivity characteristics included in the subgroup selected by the composite directivity characteristic subgroup selection process are referred to the composite directivity characteristic table memory 2m.
- a characteristic candidate is set, and the process proceeds to the combined directivity characteristic selection process in step S4.
- the combined directional pattern selection process in step S4 one combined directional pattern is selected or not selected from the combined directional pattern candidates as in the first and second embodiments.
- step S5 it is determined whether or not the flag IF is 1 (that is, whether or not the combined directivity characteristic has been selected). If NO, the composite directivity characteristic subgroup selection process in step S2B is performed. On the other hand, if YES, the process proceeds to step S6.
- step S6 the directivity characteristics of the variable directivity antenna elements 4-1 to 4-N are controlled so that the variable directivity antenna apparatus 10 has the selected combined directivity characteristics, and the reference RSSI (RSSI1r, Proceed to the RSSI2r) calculation process.
- step S7 similar to the reference RSSI (RSSIr) calculation process of FIG. 7, the reference RSSI (RSSI1r), which is the average value of RSSI1 of the immediately preceding P3 packets, and the average value of RSSI2 of the immediately preceding P3 packets. A reference RSSI (RSSI2r) is calculated.
- step S10B the RSSI1, RSSI2, and PHY rate input from the baseband processing circuit 6 are stored, and the process proceeds to step S11.
- step S11 it is determined whether or not a packet communication end notification signal has been received from the MAC processing circuit 7. If YES, the process returns to step S1, while if NO, the process proceeds to step S12A.
- step S12A it is determined whether or not the latest PHY rate is greater than a predetermined threshold PHY1, and if YES, the process returns to step S8, but if NO, the process proceeds to step S13.
- step S13 1 is added to the number of packets Pe, and the process proceeds to step S14.
- step S14 it is determined whether or not the number of packets Pe is equal to or greater than a predetermined threshold value Pec. If NO, the process returns to step S9. If YES, the process proceeds to step S15A.
- step S15A the average RSSI2b of RSSI2 in the latest Pec packets is calculated, and the process proceeds to step S16A.
- step S16A it is determined whether the difference between the average RSSI2b of RSSI2 and the reference RSSI2r in the steady state is equal to or larger than a predetermined threshold ⁇ R2c. If YES, the process proceeds to step S16B. If NO, the process proceeds to step S17A.
- step S17A In the second candidate setting process of step S17A, with reference to the composite directivity table memory 2m, composite directivity other than the composite directivity selected and included in the currently selected subgroup is selected as a composite directivity candidate. And return to step S4.
- step S16B an average RSSI1b value of RSSI1 in the latest Pec packets is calculated, and whether the magnitude of the difference between the calculated average value RSSI1b and the reference RSSI1r in the steady state is equal to or greater than a predetermined threshold value ⁇ R1c. It is determined whether or not, and when YES, the process returns to step S2A, and when NO, the process returns to step S2B.
- the combined directivity characteristic classification information of the variable directivity antenna device 10 is stored in a four-layer tree format including the combined directivity characteristic classification information.
- the present invention is not limited to this, and five or more hierarchies are included. You may memorize
- the predetermined number of packets P2 in step S39 in FIG. 8 to FIG. 10 and the predetermined number of packets P3 in step S55 in FIG. 7 are, for example, the number of packets corresponding to the period necessary for appropriately calculating the average value of RSSI. Is set.
- the predetermined threshold value Pec for the number of packets in step S14 in FIGS. 4, 11, and 15 and the predetermined packet number P3 in step S55 in FIG. 7 have the same value.
- a predetermined threshold PER2 of PER in step S12 of FIG. 4 a threshold PHY1 of PHY rate in step S12A of FIGS. 11 and 15, and a predetermined threshold of PER in step S45 of FIGS.
- Each of the values PER1 is set based on a predetermined wireless communication quality such as a maximum value of PER required by a predetermined wireless communication standard.
- step S14 in FIG. 4, FIG. 11 and FIG. 15 is performed in accordance with the time required for properly calculating the average value of RSSI after the end of step S7 ( Hereinafter, it may be replaced with a step for determining whether or not the time is Trssi or more, and step S26 in FIG. 5 is replaced with a step for determining whether or not the elapsed time since the end of step S21 is Trssi or more.
- step S39 in FIGS. 6 and 8 to 10 may be replaced with a step for determining whether or not the elapsed time from the start of the combined directivity characteristic selection process is equal to or greater than Trssi, and step S55 in FIG.
- the wireless communication device further includes a timer circuit for measuring the elapsed time.
- the predetermined threshold value Rp of RSSI and the predetermined threshold value ⁇ Rc in step S16 of FIGS. 4 and 11 are, for example, when the variable directional antenna device 10 is controlled to have the combined directional characteristics Pa to Pf. Are set based on each RSSI necessary to obtain a predetermined wireless communication quality (for example, a predetermined PER).
- a predetermined threshold value Rp of RSSI used for determining which one to select between the weak electric field group and the strong electric field group (see FIG.
- the controllable antenna device 10 When the controllable antenna device 10 is controlled, it may be set to RSSI necessary for obtaining a predetermined PER. Further, the predetermined threshold value ⁇ Rc in step S16 in FIGS. 4 and 11, the predetermined threshold value ⁇ R2c in step S16A in FIG. 14 and the predetermined threshold value ⁇ R1c in step S16B in FIG.
- the variable directional antenna device 10 When the variable directional antenna device 10 is controlled to have the RSSI necessary for obtaining the predetermined PER when the variable directional antenna device 10 is controlled, and when the variable directional antenna device 10 is controlled so as to have the combined directional characteristic Pa, the predetermined PER is obtained. Therefore, it may be set to a difference value from the RSSI necessary for this.
- the composite directivity table memory 2m stores composite directivity of two composite directivity groups.
- the present invention is not limited to this, and the multiple directivity table memory 2m is not limited to this.
- the composite directivity characteristic of the composite directivity group may be stored.
- the MAC processing circuit 7 generates a packet communication start notification signal and a packet communication end start notification signal and outputs them to the controller 2.
- the present invention is not limited to this.
- the high frequency processing circuits 5-1 to 5 -N, the baseband processing circuit 6, or a higher-layer protocol processing circuit (not shown) generates a packet communication start notification signal and a packet communication end start notification signal to generate the controller 2 May be output.
- the baseband processing circuit 6 calculates RSSI and outputs it to the controller 2.
- the present invention is not limited to this.
- the high frequency processing circuits 5-1 to 5 -N calculate RSSI based on the power level of each baseband signal, and then output the RSSI to the controller 2.
- An average value of each RSSI may be calculated and used for each directivity control process in FIGS. 4 and 11.
- variable directivity antenna device 10 is not limited to the configuration in each of the above embodiments, and may have a configuration capable of changing the combined directional characteristics.
- the variable directivity antenna device 10 may include only one variable directivity antenna element.
- the directivity controllers 3-1 to 3-N each include a reactance element connected to the variable directivity antenna elements 4-1 to 4-N.
- the reactance value of the reactance element By changing the reactance value of the reactance element based on the above, the electric lengths of the variable directivity antenna elements 4-1 to 4-N are changed, and the directivity characteristics of the variable directivity antenna elements 4-1 to 4-N are changed. Controlled.
- each of the variable directivity antenna elements 4-1 to 4-N includes a feeding antenna element and a parasitic antenna element
- each of the directivity controllers 3-1 to 3-N includes A PIN diode connected to each parasitic element of the variable directional antenna elements 4-1 to 4 -N, and applying a predetermined bias voltage to the PIN diode by a control signal from the controller 2, the PIN diode
- the directivity characteristics of the variable directivity antenna elements 4-1 to 4-N may be controlled by operating a parasitic element connected to the as a reflector.
- variable directivity antenna element 4 of the variable directivity antenna apparatus 10 is set so as to have the initial composite directivity characteristic Pa that is closest to the non-directional among the combined directivity characteristics Pa to Pf.
- RSSI was measured when the directivity characteristics of ⁇ 1 to 4-N were controlled, and either a weak electric field group or a strong electric field group was selected based on the measured RSSI.
- the present invention is not limited to this, and instead of the initial combined directivity characteristic Pa, a composite directivity characteristic that is suitable for RSSI measurement and that is substantially omnidirectional may be used. Further, instead of the initial composite directivity characteristic Pa, other composite directivity characteristics that are not included in the composite directivity characteristic table and are substantially non-directional may be used.
- the first, second, and third parameters are RSSI, PER, and PER, respectively.
- the first, second, and third parameters are RSSI, PER, respectively. And PHY rate.
- the present invention is not limited to this, and the first to third parameters indicate the quality levels of the radio signals received by the variable directivity antenna device 10, and the first parameter and the second parameter are It only has to be different from each other.
- the second parameter and the third parameter may be the same as or different from each other.
- the value indicating the signal level of the radio signal received by the variable directional antenna device 10 such as the average value of each AGC voltage that is a control voltage output from each AGC circuit in the baseband processing circuit 6, SNR, bit Received by the variable directional antenna device 10 such as error rate (Bit Error Rate: BER), symbol error rate (Symbol Error Rate: SER), or inter-channel correlation, inter-antenna correlation or eigenvalue of correlation matrix in a MIMO communication system.
- the first to third parameters may be selected from the values indicating the signal quality levels of the radio signals so that the first and second parameters are different from each other.
- the quality level of the radio signal is indicated.
- Inter-antenna correlation also referred to as inter-channel correlation
- the second parameter indicating the quality level of the radio signal is PER.
- the combined directional characteristic table is set for each combined directional characteristic of the variable directional antenna device 10 using the directional characteristic data of the variable directional antenna elements 4-1 to 4-N and the first parameter. Data of a composite directional pattern group including the composite directional pattern among a plurality of combined directional pattern groups.
- the plurality of combined directional characteristics groups include a first combined directional pattern group including a predetermined combined directional pattern for measuring the first parameter and a combined directional characteristic smaller than the predetermined combined directional pattern.
- the controller 2 measures the correlation between the antennas when the variable directivity antenna apparatus 10 is controlled to have the predetermined combined directivity characteristic in the composite directivity characteristic group selection process.
- the controller 2 controls the antenna-to-antenna correlation to be reduced by selecting the second combined directivity group, and the measured first parameter
- control is performed to secure a larger received power by selecting the third combined directivity group.
- the combined directivity characteristic selection process in step S4 may be replaced with the composite directivity characteristic selection process according to the first to third modifications of the first embodiment.
- the combined directivity table memory 2m is set for each composite directivity using the directivity data and RSSI of the variable directivity antenna elements 4-1 to 4-N.
- the plurality of combined directional characteristic groups a strong electric field group and a weak electric field group
- combined directional characteristic classification information that is data of a combined directional characteristic group including the combined directional characteristic is stored in advance.
- the present invention is not limited to this, and the combined directivity table memory 2m is set by using the first parameter indicating the quality level of the radio signal received by the variable directivity antenna device 10 for each combined directivity. What is necessary is just to memorize
- a plurality of composite directional characteristics are set using the first parameter indicating the quality level of the wireless signal received by the variable directional antenna device.
- the storage means storing in advance the combined directional characteristic classification information classified into the combined directional characteristic group, the first parameter, and the quality level of the radio signal.
- Control means is provided for selecting one combined directional characteristic from the plurality of combined directional characteristics and controlling the combined directional characteristic of the variable directional antenna device so as to have the selected combined directional characteristic. Therefore, even when the radio wave propagation environment fluctuates, the data signal can be transmitted and received stably at a higher speed than in the prior art.
- the wireless communication apparatus can be used for, for example, a wireless communication device that transfers a large-capacity data signal such as AV stream data using a MIMO transmission method.
- 1 wireless communication device, 2 ... Controller, 2m ... Composite directivity table memory, 3-1, 3-2, ..., 3-N ... Directional controller, 4-1, 4-2,..., 4-N ... variable directional antenna element, 5-1, 5-2, ..., 5-N ... high frequency processing circuit, 6 ... Baseband processing circuit, 7 ... MAC processing circuit, 10: Variable directional antenna device.
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Abstract
Description
上記各合成指向特性を上記可変指向性アンテナ装置によって受信された無線信号の品質レベルを示す第1のパラメータを用いて設定される複数の合成指向特性グループに分類した合成指向特性分類情報を予め記憶する記憶手段と、
上記第1のパラメータ、及び上記無線信号の品質レベルを示しかつ上記第1のパラメータとは異なる第2のパラメータに基づいて、上記複数の合成指向特性の中から1つの合成指向特性を選択し、当該選択された合成指向特性を有するように上記可変指向性アンテナ装置の合成指向特性を制御する制御手段とを備えたことを特徴とする。
(a)上記複数の合成指向特性のうちの所定の1つの合成指向特性を有するように上記可変指向性アンテナ装置を制御したときに、上記第1のパラメータを測定し、上記測定された第1のパラメータに基づいて、上記合成指向特性分類情報を参照して、上記複数の合成指向特性グループの中から1つの合成指向特性グループを選択し、
(b)上記選択された合成指向特性グループに含まれる各合成指向特性を有するように上記可変指向性アンテナ装置を制御したときに、当該各合成指向特性に関する上記第2のパラメータをそれぞれ測定し、上記測定された各第2のパラメータに基づいて、上記選択された合成指向特性グループに含まれる合成指向特性の中から1つの合成指向特性を選択し、
(c)上記選択された合成指向特性を有するように上記可変指向性アンテナ装置を制御することを特徴とする。
図1は本発明の第1の実施形態に係る無線通信装置1の構成を示すブロック図である。本実施形態において、合成指向特性テーブルメモリ2mは、可変指向性アンテナ装置10の合成指向特性分類情報を、当該合成指向特性分類情報を含むテーブル形式で記憶する。図2は図1の合成指向特性テーブルメモリ2mに格納された合成指向特性テーブルの一例を示す図である。また、図3は図2の合成指向特性テーブルの合成指向特性Pa~Pfの一例を示す図である。さらに、図4は、図1のコントローラ2によって実行される指向特性制御処理を示すフローチャートであり、図5~図7はそれぞれ、図4の合成指向特性グループ選択処理S2、合成指向特性選択処理S4及び基準RSSI(RSSIr)算出処理S7を示すフローチャートである。なお、図1の無線通信装置1の構成は、以下の各実施形態及び各変形例に適用される。
図8は、本発明の第1の実施形態の第1の変形例に係る合成指向特性選択処理S4Aを示すフローチャートである。第1の変形例は、上記第1の実施形態に比較して、図1のコントローラ2によって実行される合成指向特性選択処理S4(図6)を、合成指向特性選択処理S4Aに置き換えたものである。
図9は、本発明の第1の実施形態の第2の変形例に係る合成指向特性選択処理S4Aを示すフローチャートである。第2の変形例は、上記第1の実施形態に比較して、図1のコントローラ2によって実行される合成指向特性選択処理S4(図6)を、合成指向特性選択処理S4Bに置き換えたものである。
図10は、本発明の第1の実施形態の第3の変形例に係る合成指向特性選択処理S4Aを示すフローチャートである。第3の変形例は、第2の変形例に比較して、図1のコントローラ2によって実行される合成指向特性選択処理S4B(図9)を、合成指向特性選択処理S4Cに置き換えたものである。
図11は、本発明の第2の実施形態に係る指向特性制御処理を示すフローチャートである。本実施形態に係る指向特性制御処理は、第1の実施形態に係る指向特性制御処理(図4参照。)に比較して、定常状態における受信処理中に第2のパラメータであるPERに代えて可変指向性アンテナ装置10によって受信された無線信号の品質レベルである第3のパラメータであるPHYレートを測定したことを特徴としている。具体的には、図11の合成指向特性選択処理は、図4の合成指向特性処理のステップS10及びS12の各処理をステップS10A及びステップS12Aの各処理にそれぞれ置き換えたものである。
図12は、本発明の第2の実施形態の第1の変形例において合成指向特性テーブルメモリ2mに格納された合成指向特性分類情報を示す概念図である。第1及び第2の実施形態において、合成指向特性テーブルメモリ2mは、可変指向性アンテナ装置10の合成指向特性分類情報を、当該合成指向特性分類情報を含むテーブル形式で記憶した。本変形例では、図12に示すように、合成指向特性テーブルメモリ2mは、可変指向性アンテナ装置10の合成指向特性分類情報を、当該合成指向特性分類情報を含む3階層のツリー形式で記憶する。本変形例は、第1の実施形態及び第2の実施形態と同様の効果を奏する。
図13は、本発明の第3の実施形態において合成指向特性テーブルメモリ2mに格納された合成指向特性分類情報を示す概念図である。また、図14及び図15は、本発明の第3の実施形態に係る指向特性制御処理を示すフローチャートである。本実施形態は、第2の実施形態に比較して、可変指向性アンテナ装置10の合成指向特性分類情報を、当該合成指向特性分類情報を含む4階層のツリー形式で記憶したことを特徴としている。
2…コントローラ、
2m…合成指向特性テーブルメモリ、
3-1,3-2,…,3-N…指向性コントローラ、
4-1,4-2,…,4-N…可変指向性アンテナ素子、
5-1,5-2,…,5-N…高周波処理回路、
6…ベースバンド処理回路、
7…MAC処理回路、
10…可変指向性アンテナ装置。
Claims (9)
- 少なくとも1つの可変指向性アンテナ素子を備え、上記少なくとも1つの可変指向性アンテナ素子の各指向特性を重ね合わせた複数の合成指向特性を有する可変指向性アンテナ装置と、
上記各合成指向特性を上記可変指向性アンテナ装置によって受信された無線信号の品質レベルを示す第1のパラメータを用いて設定される複数の合成指向特性グループに分類した合成指向特性分類情報を予め記憶する記憶手段と、
上記第1のパラメータ、及び上記無線信号の品質レベルを示しかつ上記第1のパラメータとは異なる第2のパラメータに基づいて、上記複数の合成指向特性の中から1つの合成指向特性を選択し、当該選択された合成指向特性を有するように上記可変指向性アンテナ装置の合成指向特性を制御する制御手段とを備えたことを特徴とする無線通信装置。 - 上記制御手段は、
(a)上記複数の合成指向特性のうちの所定の1つの合成指向特性を有するように上記可変指向性アンテナ装置を制御したときに、上記第1のパラメータを測定し、上記測定された第1のパラメータに基づいて、上記合成指向特性分類情報を参照して、上記複数の合成指向特性グループの中から1つの合成指向特性グループを選択し、
(b)上記選択された合成指向特性グループに含まれる各合成指向特性を有するように上記可変指向性アンテナ装置を制御したときに、当該各合成指向特性に関する上記第2のパラメータをそれぞれ測定し、上記測定された各第2のパラメータに基づいて、上記選択された合成指向特性グループに含まれる合成指向特性の中から1つの合成指向特性を選択し、
(c)上記選択された合成指向特性を有するように上記可変指向性アンテナ装置を制御することを特徴とする請求項1記載の無線通信装置。 - 上記制御手段は、上記選択された合成指向特性を有するように上記可変指向性アンテナ装置を制御したときに、上記無線信号の品質レベルを示す第3のパラメータを測定し、上記測定された第3のパラメータが所定の第1のしきい値以下か否かを判断し、上記測定された第3のパラメータが上記第1のしきい値以下であることを検出したときに、上記選択された合成指向特性とは別の合成指向特性を有するように上記可変指向性アンテナ装置を制御することを特徴とする請求項2記載の無線通信装置。
- 上記制御手段は、上記測定された第3のパラメータが上記第1のしきい値以下であるとことを、所定のしきい値回数だけ連続して検出したときに、上記選択された合成指向特性とは別の合成指向特性を有するように上記可変指向性アンテナ装置を制御することを特徴とする請求項3記載の無線通信装置。
- 上記制御手段は、上記選択された合成指向特性を有するように上記可変指向性アンテナ装置を制御したときに、上記第1のパラメータを測定し、当該制御の開始直後に測定された第1のパラメータに基づいて基準の第1のパラメータを算出し、上記検出の直前に測定された第1のパラメータに基づいて最新の第1のパラメータを算出し、上記算出された基準の第1のパラメータと最新の第1のパラメータとの間の差の大きさが所定の第2のしきい値以上のときは、全ての上記複数の合成指向特性の中から上記別の合成指向特性を選択し、上記算出された基準の第1のパラメータと最新の第1のパラメータとの間の差の大きさが所定の第2のしきい値未満のときは、上記選択された合成指向特性グループに含まれかつ上記選択された合成指向特性以外の合成指向特性の中から上記別の合成指向特性を選択することを特徴とする請求項4記載の無線通信装置。
- 上記第3のパラメータは上記第2のパラメータと同一であることを特徴とする請求項2から請求項5までのうちの1つの請求項記載の無線通信装置。
- 上記所定の1つの合成指向特性は実質的に無指向であることを特徴とする請求項1から請求項6までのうちの1つの請求項記載の無線通信装置。
- 上記第1のパラメータは上記無線信号の受信信号レベルを示すことを特徴とする請求項1から請求項7までのうちの1つの請求項記載の無線通信装置。
- 上記合成指向特性分類情報は、上記各合成指向特性毎に、上記各可変指向性アンテナ素子の指向特性のデータ及び上記複数の合成指向特性グループのうち当該合成指向特性が含まれる合成指向特性グループのデータを含むことを特徴とする請求項1から請求項8までのうちの1つの請求項記載の無線通信装置。
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US12/993,980 US20110065391A1 (en) | 2008-05-27 | 2009-05-27 | Wireless communication apparatus for changing directional pattern of variable directivity antenna according to variations in radio wave propagation enviroment |
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