WO2007108430A1 - Wireless communication device and wireless communication system - Google Patents

Wireless communication device and wireless communication system

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Publication number
WO2007108430A1
WO2007108430A1 PCT/JP2007/055481 JP2007055481W WO2007108430A1 WO 2007108430 A1 WO2007108430 A1 WO 2007108430A1 JP 2007055481 W JP2007055481 W JP 2007055481W WO 2007108430 A1 WO2007108430 A1 WO 2007108430A1
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WO
Grant status
Application
Patent type
Prior art keywords
communication
antenna
control
wireless
device
Prior art date
Application number
PCT/JP2007/055481
Other languages
French (fr)
Japanese (ja)
Inventor
Shinya Fukuoka
Original Assignee
Pioneer Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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 using feedback from receiving side
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems

Abstract

[PROBLEMS] Efficient communication is carried out in accordance with various communication partners. [MEANS FOR SOLVING THE PROBLEMS] Prior to starting communication, a total directionality of antennas (101A-F) is set to a prescribed initial state. In this state, in response to initial communication contents in which communication is carried out with other wireless communication device (301), communication conditions of the number of the antennas, a communication system, etc., are set for communication thereafter with the other wireless communication devices. With this setting, a wireless communication device is provided with functions that are achievable for an MIMO communication but the MIMO communication system is not always used for the wireless communication device because it depends on initial communication contents with the other communication devices (301), so that communication can be carried out in a communication mode in compliance with requirements of the other communication devices (301).

Description

Specification

A wireless communication apparatus, a wireless communication system

Technical field

[0001] The present invention, multiple-input multiple-output (MIMO: Multiple Input Multiple Output) relates to a wireless communication system including wireless communication devices and this can be used to radio communications system scheme.

BACKGROUND

In recent years, Te you!, The information transmission method through a wireless communication, provided multiple antennas on both the transmitting side and the receiving side, constituting the multi-input multi-output system via the wireless transmission path (channel) M IMO scheme that has attracted attention. When communication is performed with the M transmit antennas and N receive antennas, the channel response between the transmission and reception is represented by matrix A NXM. The matrix A further correlation matrix AA H and A H A (superscript H is the complex conjugate transpose) can be degraded using the eigenvalues of the eigenvectors corresponding to the respective (singular value decomposition). In this case, in the MIMO scheme in a multipath environment, it is possible to have a min (M, N) present independent channels, it is possible to increase the utilization of space by increasing the number of transmit and receive antennas. The transmission performance of MIMO scheme at this time with the channel characteristics are determined by Rukoto using the eigenvalues ​​of the correlation matrix, it can be grasped.

[0003] As wireless communication devices such MIMO scheme, for example, technology described in Patent Document 1 has been proposed already. The prior art radio communication apparatus according to the weighting control means, calculates a channel matrix so as to reduce variations of the eigenvalues, and controls the directivity of the adaptive array antenna as current channel matrix approaches the channel matrix by, thereby improving the channel capacity.

[0004] Patent Document 1: JP 2005- 45351 JP (paragraph numbers 0037-0055, 9-11) DISCLOSURE OF THE INVENTION

Problems that the Invention is to you'll solve

[0005] the radio communication apparatus according to the prior art, among the channel capacity of the constant mel Shannon maximum signal transmission speed per frequency, to focus on improving the channel capacity that can be utilized in actual communication it is intended to place. By reducing the-out Baratsu eigenvalues ​​by the weighting control means, even small variations in the channel capacity that corresponds to their eigenvalues, as a result, effectively used for the actual communication with channel capacity corresponding to all the eigenvalues leave in the child transgression.

[0006] By the way, innovation in the communication system with the rapid spread in recent years of a mobile phone, OA equipment - more of the office equipment monochromator Irui spoon progress, the background of the network and the like of the personal computer environment utilizing the wireless LAN lower, even MIMO scheme corresponding wireless communication apparatus as described above, is not always the best to attempt to communicate with the MIMO scheme no matter what the communication partner. For example, in response to miscellaneous needs of users, the power of the data to be transmitted is a mail text Tonomi, force is an image, or the force of a musical piece, or the required transmission rate is how much such of etc. by, MIMO scheme to the communication, the normal adaptive array method, such as diversity scheme, most efficient yo to the communication method of the deviation?, or different. The same is true for whether you line communication using such a number of the plurality of antennas provided in the radio communication apparatus. In addition, the antenna of the communication partner is provided with only one element! , Provided with a device communication are several possible Ru force MIMO scheme! /, Also by the force of Ru, their selection communication method and an antenna number, the most suitable embodiment of the control varies.

[0007] In the above prior art, and summer to communicate always MIMO scheme regardless communication partner, because, a wide variety of communication partners efficiency corresponding to Yo, is difficult to reliably realize communication there were.

[0008] the object of the present invention is to Sho solve the problem described above as an example.

Means for Solving the Problems

[0009] In order to solve the above problems, the invention according to claim 1 is a wireless communication device usable in a radio communications system of multiple-input multiple-output system, where m is a integer of 2 or more, a plurality of and m antennas with § antenna elements respectively, the directivity you achieve these m-number of the entire antenna, the initial control means for controlling each antenna to a predetermined initial state, the initial control means this depending on the initial contents of communication with another wireless communication device in the initial state is realized, and a communication condition control means for setting communication conditions in the communication with the other wireless communication device. [0010] In order to solve the above problems, the invention of claim 11 wherein is provided with a radio transmitting apparatus and radio receiving apparatus, a wireless communication system capable of communicating multiple input multiple output scheme, the wireless transmitting At least one device and the wireless receiving device, comes to have two or more integer m, and m antennas having disposed mutually predetermined distance is encapsulated or loaded into the dielectric multiple antennas element respectively , the directivity realized in their entirety the m antennas, and the initial control means for controlling each antenna to a predetermined initial state, the other radio communication device in the initial state is realized by the initial control means depending on the initial communication contents, and a communication condition control means for setting communication conditions in the communication with the other wireless communication device.

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] Hereinafter, an embodiment of the present invention with reference to accompanying drawings.

[0012] FIG. 1 is a system configuration diagram showing the overall schematic of a radio communication system including a radio communication apparatus of this embodiment.

[0013] In a wireless communication system S shown in FIG. 1, the wireless communication device 1 of this embodiment includes a plurality of antennas 101A (6 one in this example), 101B, 101C, 101D, 101E, 101F, these antennas 101A and a control unit 200 for controlling the operation of the to F, Ru. Wireless communication device 1, multiple-input multiple-output scheme as described in detail later (MIMO: Multiple Input Multipl e Output) are capable of communicating via the antenna 101A~F The control unit 2 00 (described later in detail communicates with another wireless communication device 301 with the basis of the control of the overall control unit 201), one even without less of the antennas 101A~F of.

[0014] FIG. 2 is a perspective view showing the detailed structure of the antenna 101A of FIG. 1, FIG. 3 is an explanatory diagram for explaining a control system of these antennas 101A. And have you to FIGS. 2 and 3, the antenna 101A, for example a dielectric substrate 110 made of polycarbonate, and a ground conductor 111 formed on substantially the entire surface of the upper surface of this derivative collector substrate 110, over this ground conductor 111 substantially dielectric 120 formed in a cylindrical shape, (of seven in this example) a plurality of which are formed so as to bury in the dielectric 120 while being electrically insulated from the ground conductor 111 antenna in and an element P.

[0015] Antenna element P in the longitudinal direction constitutes a monopole element is perpendicular to the plane of the ground conductor 111, and one of the feed antenna element PO (feed element), at least one (example in constructed from the parasitic antenna element six) P1 to P6 (parasitic element).

[0016] feeding the antenna element PO, the ground conductor 111 includes a radiating element 106 of electrically insulated cylindrical and embedded in the dielectric 120,. The one end of the radiating element 106 is connected to signal Line, so that the radio signals fed from by connexion controller 200 which is powered to feed the antenna element P0 through the RF circuitry 290 (described later) radiation It becomes, Ru.

[0017] parasitic antenna element P1~P6 is arranged so as to be substantially circular shape in this example at a predetermined interval from each other around the power supply antenna elements P0, Ru. Each parasitic antenna element P1 to P6 is provided with a parasitic element 107 of substantially cylindrical shape disposed so as to penetrate the dielectric substrate 110 and the dielectric 120 is electrically insulated from the ground conductor 111 in the vertical direction there. One end of each of the non-excitation elements 107 has a predetermined reactance value (e.g. variable capacitance diode power also) a variable reactance element 130, and through-hole conductors 114 formed by filling formed through the dielectric substrate 110 in a vertical direction the via has been grounded at a high frequency relative to ground conductor 111.

[0018] At this time, although a length in a longitudinal direction of the radiating element 106 and the parasitic element 107 are substantially the same, for example, when the variable reactance element 130 has a inductive (L property) is variable reactance element 130 becomes an extension coil, increases the electrical length of parasitic antenna element P1~P6 is compared to the feeding antenna element PO, it acts as a reflector. On the other hand, For example, when the variable reactance element 130 has a capacitance of (C resistance), the variable reactance element 130 becomes shorter capacitor, the electrical length of parasitic antenna element P1~P6 compares the feeding conductive antenna element P0 Te shorter, it acts as a waveguide. That is, by changing the reactance values ​​of the variable reactance element 130 for changing the control voltage applied to the variable reactance element 130, the electric length of the parasitic antenna elements P1 having a parasitic element 107 to the feed antenna element P0 compared with varied, it is possible to change the horizontal plane directivity of the antenna 101A.

[0019] The above is the force other antennas 101 B~101F which was described an antenna 101A as an example has a same configuration, the same control is performed.

[0020] FIG. 4 is a functional block diagram illustrating a detailed configuration of the control device 200 shown in FIG. 1, FIG. 5 is a functional block diagram illustrating a detailed structure of them according to the transmitting-side function, Fig. 6 is a functional block diagram illustrating a detailed configuration of functions according to the reception side of Figure 4.

[0021] These 4, 5, and 6, the control device 200, m number set connected to receive a common one for feeding the antenna elements PO each antenna 101 (m = 6 in this example) an RF circuit (may be further via the IF circuit) 290, which is, for LPF242 及 beauty analog-to-digital converter performs band limiting of the received signal the received signals provided m number corresponding to each of the m antennas 101 and AZD strange ^ ^ 241, a frequency conversion unit 300 which performs processing such as demodulation and inputs the received signal of the m AZD variable ^ ^ 241 force, with respect to the received signal demodulated by the frequency varying section 300 performs predetermined reception directivity control process (for example, a digital filter corresponding to the complex of the I and Q components) the receiving side digital directivity control section 250 (the power supply side control means), the receiving side digital directivity control unit to the signal from 250, e.g., an OFDM scheme Ya A receiving side signal processing unit 260 that performs a known demodulation process based on the FM system or the like, an error state monitoring circuit 204 monitors the occurrence of processing errors in the reception-side signal processing unit 260, the monitoring result of the error state monitoring circuit 204 depending the selection circuit 270 for selecting a demodulated signal at the receiving side signal processing unit 260, a decoding unit 27 1 for decoding by a predetermined known method the selected signal (demodulated wave) at the selected circuit 270 in has a response bit sequence interpretation unit 272 reads the received data (information signal) received by the antenna 10 1 from the communication partner by interpreting the decoded signal decoded by the decoder 271.

[0022] The control device 200 further includes a command bit string generation unit 274 generates a command bit string corresponding to the transmission data to be transmitted from an antenna 101, a predetermined digital signal output from the command bit Retsusei generation unit 274 the encoding unit 273 for encoding by the method, this code I radical 21 273 and the transmission-side signal processing unit 210 that performs a known modulation process based on the code I spoon signal is input for example OFDM and FM system such , a frequency conversion unit 310 to predetermined processing is performed such as modulation on the signal from the transmission-side signal processing unit 210, a transmission directivity control process to the signal from the frequency conversion section 310 of this performed (e.g. I component 及 beauty becomes a digital filter strength corresponding to the complex number Q component) sender digital directivity controller 220 (power supply side control means) corresponding to each transmission signal to the m antennas 101 And DZA converter 232 to be output to the m digital-to-analog converter after the RF circuit 290 is provided, m pieces parasitic antenna elements of the antenna 101 each of a plurality of (m = 6 in this example) (six in this example) and § for performing predetermined orientation control analog directivity control section 280 (the non-feeding-side control unit) using P1 to P6, provided m number corresponding to the transmission signal each to the m antennas 101 are signals digital from analog directivity controller 280 - a DZA converter 292 which outputs a control voltage to the parasitic antenna elements P1~P6 of each antenna 101 after analog conversion, the reception-side digital directivity control unit 250, sender digital directivity control unit 220, and a total control unit 201 for controlling the entire units such as the analog directivity control section 280.

[0023] to the frequency conversion section 310, Tokoro (in the above example m = 6) number m of antenna 101 is provided with m lines corresponds to, as common to the m lines, for example the function table transmitting digital outputs a transmission signal of the stored sampled values ​​back to the communication partner (carrier) digital signal to form the Fc (e.g. signal sampled sine wave) so as to correspond to each phase at constant sampling point signal output section 213 is provided one

[0024] Further, each of the m lines, based on the encoded information signal (data) by the sign I radical 21 203, for the transmission information by modulating a carrier wave Fc from the transmission digital signal output section 213 and outputs the modulated signal (e.g. that generates the I and Q components with GFSK modulation) modulation section (multiplier) 21 2 0, 21 2 1, ..., and 212-n, the multipliers 212-0, 212 - 1, · ·, 212- n BPF211aO each passing signals of a predetermined frequency of the I and Q components of the signals from each, 211b0, 211al, 211bl, · ·, a 21 lan, 21 lbn It is provided.

[0025] Also sender digital directivity control section 220 is provided m lines corresponding to the respective lines, the BPF211aO, 211b0, 211al, 211bl, · ·, 21 lan, are respectively synthesized through 211bn and relates to the synthesis signal and the corresponding coefficients (phase control signal) CIO, C11, · ·, total (n + 1) for weighting to obtain a predetermined transmission directivity based on Cln like (this example from the overall control unit 201 in n = coefficient multiplier 221a0, 221al 6), ..., and 221An, and an adder 222 for combining the outputs from these n + 1 coefficients multipliers 221a0~an provided, respectively. Output is supplied to the power supply antenna elements PO antenna 101 corresponding respectively via the DZA converter 232, RF circuitry 290 of the above from the adder 222 of each system

[0026] to the frequency conversion section 300 in the same manner as described above and m lines is provided, each line, the I and Q components of the complex numbers included in the received signal after the A ZD output from variable 241 weighting against the sum n + 1 pair coefficient multiplier 261a in (in this example n = 6) for performing IQ quadrature demodulation (the quadrature detection) by multiplying each digital signal bit sequence which are orthogonal to each other, and 261b, these n + 1 pair includes coefficient multiplier 261a, and combining the outputs from 261b and a FIR filter unit 262 for performing a predetermined filtering each! /, Ru.

[0027] to the receiving side digital directivity control section 250, the same, and m lines are provided corresponding to the number of antennas 101 m (m = 6 in the above example), each line output from FIR262 It relates the received signal, the corresponding coefficients from the overall control unit 201 (the phase control signal) D10, D 11, · ·, total (n + 1) for weighting to obtain a predetermined transmission directivity based on Din and the like ( coefficient multipliers 251- 0 in this example n = 6), 251 - 1, · ·, 251-n and, an adder for combining the outputs from the n + 1 coefficients multipliers 251- 0~251-n Bei Eteiru 252 and, respectively.

[0028] The reception-side signal processing unit 260 (connected to, for example, the adder 252) error detector (not shown) (CRC detector, etc.) is connected, the error state monitoring circuit 204 reception-side signal processing unit 260 depending on the error detection signal even the error detector force is supplied, and outputs the selection command signal to the selection circuit 270 (Note, the error state monitoring circuit 204 monitoring results in accordance with the detection signal as the information such as error flags also it outputs the total control unit 201). This selection command signal is for instructing to select the output of the system which outputs the normal detection results in the error detector, selection circuit 270, among the signals of each system, corresponding to the selection command signal It selects and outputs the signal to the decoding unit 271.

[0029] After being selected by the selection circuit 270 thus outputs from the adder 252 of each path is via the reception-side signal processing section 260, decoded in decoding section 271 further replies Bit string interpreting portion 2 is interpreted at 72 is taken out as the received information. Thus, like other wireless communication device 301, after the communication with the communication partner, force the communication partner is requesting any good UNA communication to the wireless communication device 1 of the present embodiment That is, the other wireless communication device 301 antenna (element) and the number of, (whether the communication contents are a force, voice and image, the force is a file of text only, whether it is e-mail, etc.) the other party user of the application or, how much of the data transfer time • or Ru and processed in real time, power, user desired priority, etc., and the like can be obtained in the entire control unit 201 as information.

[0030] Incidentally, also in each line of the receiving-side signal processing section 260, not shown RSSI (Received Si gnal Strength Indicator) and the circuit is provided, the detection signal "R SSIj the received signal strength (reception of the RSSI circuit It is inputted to the overall controller 201 as an electric field strength) information.

[0031] FIG. 7 is a flowchart illustrating a control procedure overall control unit 2 01 provided in the controller 200 of the wireless communication device 1 of the present embodiment is executed. 7, first, in step S5, the total (six in this example) performs initial setting process so that the antenna 101 total directivity due is substantially omnidirectional. More specifically, for example, outputs a control signal to the analog directivity controller 280 all (six in this example) antenna 101 a predetermined value in a directional by parasitic antenna element P1~P 6 in each (predetermined direction) set to together (see FIG. 8 described later), the above-mentioned to the receiving digital directivity controller 250 controls the coefficient D10~Dmn and control coefficient C10~Dmn predetermined described above to the transmitting side digital directivity control section 220 It is set to a value, that this shall be the initial setting control to be substantially omnidirectional total directivity with respect to substantially all directions by all the antenna 101. In this case, the directivity of the antenna 101 adjacent (region) is controlled so as to overlap each other (refer to FIG. 8 described later). Note that these default values, the operator (or the factory) it may also be possible to set appropriately.

[0032] Subsequently, the flow proceeds to step S10, under the initial setting set in step S5, the command bit stream generation unit 274, the encoding unit 273, transmission-side signal processing unit 210, frequency conversion section 310, the transmission-side digital directivity control transmitting a beacon signal from the antenna 101 parts 220 respectively controlled to be waiting in a standby state. 8, the contact Keru wave radiation aspect the standby standby state after the initial setting is an explanatory view schematically showing. As described above, the directivity of the antenna 101 adjacent (region) so that overlap each other! /, Ru.

[0033] Then, in step S20, the beacon signal corresponds other radio communication device 3 01 of the communication partner force also the response signal frequency converter 300, the receiving side digital directional control section 250, reception-side signal It is received by the processing unit 260, selection circuit 270, a force whether received without error at replies Bit string interpreting portion 272 via the decryption unit 271 judges. Receiving at all power Taka of the response signal, the determination is not satisfied if the received even if an error occurred, was (detected by error flags, etc. from the error state monitoring circuit 20 4), return to Step S 10 One is to continue the continuation standby state-out bow I.

[0034] If the response signal from another wireless communication apparatus 301 or the like has been received without error, the determination is satisfied in step S 20, the flow proceeds to step S100. At step S100, the received response signal interpretation results from (reception result), the number of the other check of the contents of communication with the wireless communication device 301 (another wireless communication device 301 or the like of the antenna element is required transmission rate, receiving confirmation signal strength and the like various kinds of information) and the communication condition setting processing of the corresponding to the radio communication apparatus 1 in this occurs.

[0035] FIG. 9 is a flowchart showing the detailed procedure of step S100. First, in step S 105, based on the reception result of the response signal, the number of antenna elements such as another wireless communication device 30 1 which is a communication partner is determined whether one. Determination is satisfied if the other wireless communication device 301 is equipped with only one antenna element instead of the two or more, the procedure proceeds to step S 110.

[0036] In step S110, based on the reception result, the magnitude of the (for example, a predetermined threshold value and determines whether the transmission rate requested by the other wireless communication device 301 (transmission rate) is relatively high comparison may be). Request if the transmission rate is relatively low, the determination moves to fully Tasarezu step S 115.

[0037] In step S115, based on the reception result (detected by the RSSI circuit) the received signal strength at the time of the response signal received from another wireless communication apparatus 301 is relatively large if the determining (eg, a predetermined tooth it may be compared in magnitude with threshold). If the received signal strength is relatively large proceeds to step S 120, the determination is satisfied is, m-number (in this example m = 6) is the maximum for example the received signal strength of the antennas 101 (or error rate may also be) used a single antenna 101 at the lowest one, each unit to communicate with the directivity of the antenna 101 is provided (set in step S5 in the predetermined direction) another wireless communication device 301 continues as it to output a control signal. On the other hand, if the received signal strength is relatively small again passes to step SI 25, the determination is not satisfied in step SI 15, m pieces in the received signal strength for example of the antenna 101 (m = 6 in this example) is the maximum there (or even may be of E error rate is lowest) using one antenna 101, the antenna 101 is provided, Ru directional another as Ryakuna directivity substantially in all directions (predetermined direction set in step S5) wireless communication device 301 and the transmission-side digital directivity controller 220 to communicate the outputs a control signal to the reception side digital directivity controller 250 or the analog directivity control section 280, etc.

[0038] On the other hand, in step S110, when another wireless communication device 301 transmission rate which is required by the (velocity feed Den) is relatively high strength ivy, the determination is satisfied proceeds to step S130. In Sutetsu flop S130, it determines as in step S115 described above, a relatively large received signal strength at the time of the response signal received from another wireless communication device 301, or how. If the received signal strength is relatively large proceeds to step S 135, the determination is satisfied is, m number predetermined (e.g. the received signal strength for example of the antenna 101 is large or error rate (m = 6 in this example) is low V,) using the antenna 101 of the N (where N≤ m) outputs a control signal to each unit to perform the well-known diversity control. On the other hand, if the received signal strength is relatively small is passed to step S140, the determination is not satisfied in step S 130, m number predetermined (e.g. the received signal strength for example of the antenna 1 01 (this m = 6 in the example) in size , or error rate is low,) N present (N ≤m) of using the antenna 101, the transmission-side digital directivity control section 220 to perform a known adaptive array control, the receiving side digital directivity controller 250 and analog It outputs a control signal to the directivity control section 280 and the like.

[0039] Further, in step S105, the determination is not satisfied if the antenna element number of such other wireless communication device 301 is a communication partner was 2 or more, the flow proceeds to step S145. In scan Tetsupu S 145, similar to step S 110, based on the reception result, is requested from another wireless communications device 301, Ru transmission rate (transmission speed) to determine whether a relatively high, or. Request if the transmission rate is relatively low, the determination is not proceeds to step S1 30 described above satisfy performs after the same manner as described above procedure. Request if the transmission rate is relatively high, the flow proceeds to step S150, (low eg the received signal strength is large or error rate) m number given example of the antennas 101 (in this example m = 6) N present ( using the antenna 101 of N≤m), known multiple-input multiple-output (MIMO: Multiple input Multiple output) transmission side digital directivity controller 220 to communicate the scheme, the receiving side digital directivity controller 250 and analog It outputs a control signal to the directivity control section 280 and the like.

[0040] In the above, the antenna element number of large and small, high and low of required transmission rate, has been described as an example a case in which various setting communication conditions the magnitude of the received signal strength is not limited to this, it is possible to acquire the received signal strength other information, for example, application Chillon the counterpart user (a force communication contents is an image, or an audio, the force is a text-only file, or a mail, etc.) and, how much data transfer time, requesting real-time-power users wish priority, etc., based on the Luke like, setting the communication conditions.

[0041] The thus to step S 120, step S 125, step S 135, step S 140, When the scan Tetsupu S150 is completed, the flow proceeds to step S155, among the m antennas 101, they step S 120, step S 125, step S 135, step S 140, performs the same processing as step S5 so that the total directivity by the remaining antenna 101 other than those used in step S 0.99 is substantially omnidirectional. Incidentally, Yo even if the communication operation of the remaining antenna 101 is stopped. Step S 155 is complete and ends this routine.

[0042] Returning to FIG. 7, the step S100 as described above is finished, the routine goes to step S25, under the above SL Contact to step S100, described above Te communication condition setting, the command bit string generating unit 27 4, encoding part 273, transmission-side signal processing unit 210, frequency conversion section 310, the transmission-side digital directivity control unit 220 controls each transmits a signal from the antenna 101 to start communication with another wireless communication device 301.

[0043] 10, 11, the communication mode between the other wireless communication device 301 to be performed at this time is an explanatory view schematically showing. Figure 10 is a one the number of antenna elements of the other wireless communication device 301, the results and the received signal strength lower required transmission rate is set in a large instrument step S120 is performed, the one antenna 101 directional antenna 101 is provided (set in step S5 in the predetermined direction) continues to be carried out communication with the other wireless communication apparatus 301 as is, it shows an example of situations that, Ru.

[0044] On the other hand, FIG. 11 as a result of a one number of antenna elements of the other wireless communication device 301, is set in and the received signal strength is small tool Step S140 high required transmission rate was conducted, N this antenna 101E of (in this example N = 2), with respect to those said other wireless communication apparatus 301 by the adaptive array control 101F (send or receive) the sensitivity is performed is controlled is one Sorcerer communication so as to maximize , it shows an example of situations that, Ru.

[0045] In addition, there is the number of antenna elements of the other wireless communication apparatus 301 has two or more, required transmission rate is high, you! / To step S 0.99 If, using the antenna 101 of the N Te MIMO While communication is performed, FIG. 12 is a conceptual explanatory diagram conceptually illustrating the behavior of this MIMO communication. In this drawing, in order to clarify I spoon of illustration, several three Tsutoshi antenna 101 definitive to the wireless communication device 1 of the present embodiment, also other wireless communication device 301 which is the communication partner, this embodiment It is shown as being provided with the same configuration as the wireless communication device 1 of the embodiment. When communication is performed with three receiving antenna 101 of the three transmission of the wireless communication apparatus 1 the antenna 101 and the other wireless communication device 301 as shown, the channel response between the transmitter is represented by a matrix of 3 X 3 that. In this case, 3 X 3 = 9 transmission lines as shown in MIMO communication in a multipath environment (channel), it is possible to virtually three independent channels by eigenvalues ​​conversion, it is possible to increase the availability of space.

[0046] determines Returning to FIG. 7, when the step S25 as described above ends, the flow proceeds to step S30, a force whether the operator force also had communication end instruction. Through Figure shows a ヽ operation means provided in the wireless communication apparatus 1, the determination of Yoko is satisfied when the radio communication stop instruction by the operator or the like has been performed, the flow ends. The determination is not satisfied until a stop instruction, the process proceeds to step S35.

[0047] In step S35, similarly to Step S10, and the standby state sends a beacon signal. In this case, step S 120, step S 125, step S 135, step S 140, 1 to N antennas set in Sutetsu flop S 0.99 is already using Te per cent, to communicate with another wireless communication device 301 !, if sending the beacon signal using, Runode, for example, the only remaining of the antenna 101 otherwise.

[0048] Subsequently, the flow proceeds to step S35, similarly to step S20 described above, the beacon signal further another wireless communication device 302 communication such partner appeared to correspond, the response signal is frequency conversion unit 300 from it, recipient digital directivity control unit 250, is received at the receiving side signal processing unit 260, determines the force whether that is received without error at replies Bit string interpreting portion 272 through the selection circuit 270, the decoding unit 271. Receiving at all power Taka of the response signal, the determination is not satisfied if the error one has occurred be received and repeats the same procedure returns to step S25.

[0049] Further, when the response signal of another wireless communication device 302 Hitoshiryoku was received without error, determination of stearyl-up S40 is satisfied, the flow proceeds to step S 200. In step S 100, processing equivalent to the Sutetsu flop S100 is performed, the received response signal interpretation results from (reception result), confirmation of the contents of communication with the still another wireless communication device 302 (antenna elements number, the required transmission rate, various confirmation information) and the communication condition setting processing in the corresponding the radio communication apparatus 1 to such reception intensity is performed. Its details will be omitted for example as in step S 10 0, since suffices that shown in FIG. 10.

[0050] When the step S200 is finished, the routine goes to step S45, similarly to step S25 described above, under our, the aforementioned Te communication conditions set in the step S200, the command bit stream generation unit 274, coding section 273, transmission side signal processing unit 210, frequency conversion section 310, the transmission-side digital directivity controller 220 controls each transmits a signal from the antenna 101, further starts communication with another wireless communication device 302 described above.

[0051] FIG. 13 is an explanatory view schematically showing the communication mode between the still another wireless communication apparatus 302 to be executed this time. 13, already antenna 101E, when performing an adaptive array mode communications with another wireless communication device 301 with one of the antenna elements by 101F, further another wireless communication device 302 appears, other results requested bit rate number be two antennas element of the wireless communication device 302 is set in step S150 of the high ingredients Figure 10 has been performed, the antenna 101A which has not been subjected (e.g. in communication, 101B, 101C, 101 that the largest of the received power of the D and is selected as being second only to) the antenna 1 01B, in a state where communication using MIMO scheme is initiated between the still another wireless communication apparatus 302 using a 101C It shows an example.

[0052] Returning to FIG. 7, the step S45 is completed in the manner described above, the process returns to step S40, and the same procedure is repeated.

[0053] FIG. 14 is a diagram showing a practical application example of the wireless communication device 1 of the present embodiment configured as above. 14, in this example, In'napa panel IP handles SW opposite in the room ahead of the automobile AM ​​radio communication device 1 (the passenger side) is provided, also not shown in the room behind (rear seat) television CT having an antenna (corresponding to such other wireless communications device 301 described above) is provided. Then, corresponding to together with the communication between a plurality of antennas 101 and TV CT of the wireless communication device 1 is performed, a plurality of other antennas 101 and ground side of the base station BP (such as other wireless communication device 301 described above. or the communication is being performed between the good not) be an artificial satellite or the like. In this case the wireless communication apparatus 1 is functioning as a radio transmitting apparatus or unsubstituted linear receiving device, these wireless communication devices 1, 301, the radio communication system S 301 is constituted.

[0054] FIG. 15 is a diagram showing another application example of the wireless communication device 1 of the present embodiment. In Fig. 15, in this example, two cars AM, AM, respectively, similar to FIG 14, the wireless communication apparatus 1 is provided in the inner first panel IP. The communication using the two wireless communication device 1, 1 if a plurality of antennas 101 for example between (so-called inter-vehicle communication) is performed. In this case, paying attention to one of the wireless communication device 1, the other radio communication equipment 1 is equivalent to other wireless communication device 301 described above, radio communications system S in these wireless communication apparatus 1, 301 is configured ing. The wireless communication device 1 functions as a radio transmitting apparatus or the radio receiving apparatus.

[0055] In the above, step S5 of the flow shown in FIG. 7 the overall controller 201 provided in the controller 200 of the wireless communication device 1 is executed is described in each claim, implemented throughout the m antennas directivity to constitute the initial control means to control each antenna to a predetermined initial state. The communication condition step S100 is, in accordance with the initial contents of communication with the initial control means Contact Keru other wireless communication device to the initial state is realized by, for setting communication conditions in communication with the said another wireless communication device constituting a control means.

[0056] In addition, the flow of steps S120 shown in FIG. 10, step S125, the step S135, Sutetsu flops S140, and step S150, the as the communication condition, the communication method, multiple-input multiple-output system or adaptive array scheme, or diversity scheme! /, as well as a communication system control means for controlling the communication method of Zureka, as the communication condition, also constitutes the antenna number control means for setting the number of antennas N to be used.

[0057] Also, step S 155 is, as the communication condition, based on the set number of antennas of the antenna number control means for controlling the directivity by a plurality of antenna elements in each antenna of the other remaining a predetermined aspect-oriented constituting sexual control means.

[0058] As described above, the radio communication apparatus 1 according to this embodiment is a multiple-input multiple-output system of the wireless communication system the wireless communication device usable in S 1, and an integer of 2 or more and a m, and m antennas 101 having a plurality of antenna elements P0~P6 respectively, the directivity realized throughout these m-number of antennas 101, initial control means for controlling each antenna to a predetermined initial state (this step S5) to the overall control unit 201 executes in the example, depending on the initial contents of communication with another wireless communication device 301 in the initial state is realized by the initial control means S5, communication with the other wireless communication device 301 communication condition control means for setting the communication conditions (overall control unit 201 in this example is a step S100 to execute) and having an in.

[0059] Contact! /, Te is the wireless communication device 1 of the present embodiment, the entire antenna 101A~F (6 pieces of, in this example) Contact! /, Initial control hand stage S5 First Te is more before the start of communication a predetermined initial state directivity by. Then, according to communication with another wireless communication device 301 in the initial state to its initial communication contents having conducted, the communication condition control means S100 sets the communication condition in the communication with the subsequent of the other wireless communication device 301 . Thus, while have a multiple input multiple output scheme capable of realizing the performance, it is the initial contents of communication with another wireless communication device 301 without regard to the communication of the multiple input multiple output scheme, the other radio it can execute wireless communication with communication manner consistent to the communication device 301. As a result, it is possible to reliably realize efficient communication corresponding to a wide variety of communication partners.

[0060] In the wireless communication apparatus 1 in the above embodiment, the communication condition control means S 100, as the communication condition, the communication system, multiple-input multiple-output system or adaptive array mode or da Ibashichi method, the Zureka communication system control means (step S 120 that the overall control unit 201 in this example is performed, step S 125, step S 135, step S140, and step SI 50) for controlling the communication system characterized by having a.

[0061] Thus, control for executing the high-efficiency transmission by the large-volume transmission or single transmission path due to multipath transmission channel (MIMO communication), m pieces antenna 101 overall by oriented in (m = 6 in this example) control (adaptive array control) and that sensitivity is maximized with respect to the communication partner sex, same signal Nitsu received by a plurality of § antenna 101!, using signals excellent antenna 101 of radio wave condition preferentially Te control to achieve the (diversity control), etc., by the communication partner and efficiency!, it is possible to perform reliably communicate.

[0062] In the wireless communication apparatus 1 in the above embodiment, when the communication system control unit S 100 is the other wireless communication device 301 is provided with one antenna element also forces antenna, an adaptive array system communication scheme characterized by a.

[0063] Thus, the antenna 101 directed to realize the whole of m (m = 6 in this example), is controlled so that sensitivity to those the one antenna element also forces the antenna is maximized, those the antenna and efficiency of Yo, can be reliably communicate (see FIG. 11 and the like).

[0064] In the wireless communication apparatus 1 in the above embodiment, the communication condition control means S 100, as the 1 to m of the integer N, as the communication condition, an antenna number control to set the N number of antennas used means (step S 120 that the overall control unit 201 in this example is performed, step S 125, step S 135, step S 140 and step S 0.99,) and having a.

[0065] corresponding to a wide variety of communication partner, by antenna speed control unit S 120, S125, S135, S140, S150 to set appropriately the number m of antenna 101 in the range of L≤N≤m, other a reliably executable wireless communication in the communication mode that matches the wireless communication device 301.

[0066] In the wireless communication apparatus 1 in the above embodiment, the communication condition control means S 100, as the communication condition, the antenna speed control unit S 120, S125, S135, S140, based on the set number of antennas 101 S150 , characterized in that it has a directional control means for controlling the directivity by a plurality of antenna elements P0~P6 a predetermined manner (step S155 that the overall control unit 201 in this example is performed) at each antenna 101 of the other remaining to.

[0067] By the directivity of the antenna 101 is not used to control the predetermined manner, in addition to the communication being performed by the antenna 101 during use, yet another communication partner (the wireless communication device in this example when the 302. see Figure 13 for example) has appeared, it is possible to adjust the standby system to start communication smoothly.

[0068] Instead of the above-described directional control means S155, the communication condition control unit S 100 is, as the communication condition, the antenna speed control unit S 120, S125, S135, S140, S150 sets the number of antenna 101 the basis, when it is to have a sheet charge control means for stopping the supply of power to the rest of the antenna 101 other than it uses, Do, by stopping the power supply to the antenna 101, wasteful power consumption it can be avoided.

[0069] In the wireless communication apparatus 1 in the above embodiment, a plurality of antenna elements P0~P6 antenna 101 includes a feed element P0 which signal is fed, provided predetermined distance being isolated from the feed element P0, signal has Nde contains at least one parasitic element P1~P6 not powered, is encapsulated or loaded into the dielectric, characterized in that it is arranged at a predetermined distance from each other.

[0070] using a reactance system controllable ESPAR antenna directivity control in to feed element PO and the parasitic elements P1 to P6 to provided parasitic elements P1 to P6, further plurality of elements P0~P6 the dielectric by sealing (or loading), the antenna 101 can be downsized.

[0071] In the wireless communication apparatus 1 in the above embodiment, the communication condition control means S 100, as the communication condition, the m pieces directional feeding element PO provided in the antenna 101 (in this m = 6 in the example) control feeding-side control unit (transmission side digital directivity controller 22 0 and the reception-side digital directivity control unit 250 in this example), as the communication condition, the parasitic element provided on the m-number of antennas 101 P1 to P6 (in this example an analog directivity control section 280) passive side control means for controlling the directivity and having a.

[0072] If only feed element P0 side of each antenna 101 as a digital control system that attempts to m antennas 101 overall directivity control, digital processing corresponding to the number and their antenna and RF circuitry is large the Chikarari ones. On the other hand, even if an attempt is made to directivity control of an adaptive operation such as only parasitic element side P1~P6 of each antenna 1 01 comprising an analog control system, similarly to the above digital processing becomes large is Chikarari.

[0073] In the wireless communication device 1 of the present embodiment, the image of the directivity characteristic as represented conceptual in FIG. 16, first row directional you Ozatsuba settings in parasitic side control means 280 One advance (reference region G1), further fine directivity control performed by the power supply side control means 220, 250 (reference region G2), by using in combination these, more directional ¾ | can ¾ Kusuru (see realm G). It is also possible to improve the flexibility of the directivity control system.

[0074] In the wireless communication apparatus 1 in the above embodiment, the initial control means S5, the initial shape as a state, m-number of each antenna so that the antenna 101 each have directivity adjacent overlap portions to each other of the antennas 101 and controlling 101.

[0075] In the state directivity of each antenna 101 adjacent are not overlapped Gotsu, can detect this case has been reached only in the region where the signal from another wireless communication apparatus 301 to the wireless communication apparatus 1 does not overlap happens the not, as a communication impossible. By the radio communication equipment 1 of this embodiment is kept fit overlap the directivity of the antenna 101 adjacent in the initial state (region) (see FIG. 8), to perform a reliable communication by avoiding the evils It is Ru can.

[0076] The present embodiment is not limited to the above, various modifications are possible. It will be described below in order such modification.

[0077] (1) When a plurality of antennas adjacent to to choose

That is, in the above embodiment, the flow step S135 that shown in FIG. 10, Sutetsu flop S 140, when controlling to use a plurality of N antennas in step S 0.99, so as to be always a group of antennas adjacent to each other is a case to be selected. This modification will be described with reference to FIG. 17.

[0078] In FIG. 17, the radio communication device 1 comprises six antennas 101A~101E are first other wireless communication device 301 with two antennas 101E, communicates with 101F, then the other wireless communication device further 302 consider a case in which the communication with.

[0079] In communication with the wireless communication device 302, as shown in FIG. 17, not adjacent antenna antenna 101B, assuming that communicates with 101D, further another wireless communication equipment 303 antenna 101C, when an attempt is also'll communication direction force 101D, to use which do such have antenna 101C, the communication between the antenna 101D and the wireless communication device 302 may interfere (emission regions overlap partially. Referring arrow figure) that , and this result, communication with the wireless communication device 303 becomes impossible.

[0080] In contrast, step S135, step S140, if so be sure to select a plurality of antennas adjacent to each other in step S150, the in the example above adjacent in communication with the wireless communication device 30 2 antennas 101B as a result of the the use of 101C, at least using the antenna 101D (without intercession also be disturbed) enables communication with the wireless communication device 303. Incidentally, the effective when the communication partner such that movement.

[0081] (2) the MIMO scheme, STC, SDM, when further combined with OFDM or the like

In the embodiment described above, when controlling to perform the MIMO communications in step S150 in the flow shown in FIG. 10, when the known particularly Te you, the description Shinano force ivy force the MIM O communication control details thereof it may be the technique of spatial coding scheme (STC) or space division multiplexing (S DM). Further, Yo be combined our method an appropriate known orthogonal frequency division multiplexing (OFDM),.

In the wireless communication device 1 in the [0082] present modification, the communication system control unit S 100 is a communication method, space-time coding scheme or a spatial division multiplexing scheme, and among the orthogonal frequency division multiplexing scheme, at least, deviations and controlling on whether further combined communication method one.

[0083] Thus, the transmission /, when control for transmitting reclassified a signal in the time domain and spatial domain with respect to time series data (= space-time coding scheme; STC)! Or equal for each antenna element of the transmission multicarrier transmission control (= orthogonal frequency-division multiplexing to expand and, a wide frequency band information to a number of subchannels of the narrow frequency band; separate control information assigns transmitting (SDM = space division multiplexing) with power; realize OFDM) and the like, it is possible to reliably perform good V ヽ communication of the communication partner and efficiency.

[0084] Wireless communication apparatus 1 in the above embodiment is a multiple-input multiple-output system of the wireless communication system S radio communication apparatus usable to 1, where m is a integer of 2 or more, a plurality of antenna elements P0 and m antennas 101 each having to P6, the directivity realized throughout these m-number of antennas 101, the procedure Sutetsu flop S5 for controlling the antennas so as to have a predetermined initial state, at step S5 depending on the initial contents of communication with another wireless communication device 30 1 in the implementation the initial state, and a procedure of step S 100 to set the communication conditions in the communication with the other wireless communication device 301.

[0085] First directional by total six antennas 101A~F in step S5 before the start of communication is a predetermined initial state. Then, depending on the initial communication contents of communicating with another wireless communication device 30 1 in the initial state, at step S100, the communication conditions with subsequent of the other radio communications apparatus 301 is set. Thus, while it has a multiple input multiple output scheme feasible performance, is the initial contents of communication with another wireless communication device 301 without regard to the communication of the multiple input multiple output scheme, the other radio communication it can execute wireless communication with device 301 two Go match communication manner. As a result, it is possible to reliably realize efficient communication corresponding to a wide variety of communication phase hand.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a system block diagram showing the overall schematic of a radio communication system having a wireless communication device according to an embodiment of the present invention.

Is a perspective view showing the detailed structure of the antenna shown in FIG. 1; FIG.

3 is an explanatory diagram for explaining a control system of the antenna shown in FIGS.

A [4] functional block diagram illustrating a detailed configuration of the control apparatus shown in FIG.

Is [5] a functional block diagram illustrating a detailed configuration of functions related to the transmission side in the configuration shown in FIG.

A [6] a functional block diagram illustrating a detailed configuration of functions according to the reception side in the configuration shown in FIG.

7 is a flowchart illustrating a control procedure overall control unit executes the control apparatus shown in FIG.

8 is a wave radiation aspects an explanatory view schematically showing the standby standby state after initialization.

9 is a flowchart which shows the detailed procedure of step S100.

The communication mode between [10] Other wireless communication device is an explanatory view schematically showing.

[11] The communication mode between the other wireless communication device is an explanatory view schematically showing.

12 is a conceptual explanatory diagram conceptually illustrating the behavior of the MIMO communication.

FIG. 13 is an explanatory view showing still communication aspects with another wireless communication device schematically.

14 is a diagram showing a practical application example of the wireless communication device.

It is a diagram showing another application example of FIG. 15 the wireless communication device.

16 is a diagram showing a conceptual image of a directivity control characteristics by the non-feeding-side control means and the feed-side control unit.

It is a diagram illustrating a modification in which to select a plurality of antennas [17] adjacent. DESCRIPTION OF SYMBOLS

1 wireless communication device (wireless transmission apparatus; wireless reception device)

101A~F antenna

200 controller

201 overall control unit

301 wireless communication device

302 wireless communication device

303 wireless communication device

PO feed antenna element (feed element, the antenna element)

Pl~6 parasitic antenna element (parasitic element, the antenna element) S radio communication system

Claims

The scope of the claims
[1] A wireless communication device usable in a radio communication system of the multi-input multi-output system, as two or more integer m, and the m antenna having a plurality of antenna elements, respectively, these m-number of the entire antenna in the directivity to achieve an initial control means for controlling the Kakua antenna to a predetermined initial state,
Depending on the initial contents of communication with another wireless communication device in the initial state is realized by the initial control means, and a communication condition control means for setting communication conditions in the communication with the other wireless communication device
Radio communication apparatus characterized by having a.
[2] The wireless communication device according to claim 1, wherein,
Wherein the communication condition control means, as the communication condition, the communication system, with the multiple-input multiple-output system or adaptive array system or communication system control means that control the one of the communication methods of diversity system, wireless communication device to.
[3] The wireless communication device according to claim 2, wherein,
The communication system control means, the other when Ru and an antenna radio communication apparatus consists of a single antenna element, a radio communication apparatus characterized by an adaptive array mode the communication mode.
[4] The wireless communication device according to claim 2, wherein,
The communication system control means, a communication method, space-time coding scheme or a spatial division multiplexing scheme, and among the orthogonal frequency-division multiplexing, and wherein the controller controls the communication system was further combine at least one wireless communication device.
[5] The wireless communication device according to claim 1, wherein,
The communication condition control means, as one or more m an integer of N, as the communication condition, the radio communication apparatus according to feature in that it has a number of antennas control means for setting the number of the antennas used N.
[6] The wireless communication device according to claim 1, wherein,
The communication condition control means, as the communication condition, based on the set number of antennas of the antenna number control means for controlling the directivity by the plurality of § antenna elements in the other remaining antennas of the predetermined manner wireless communication device according to feature in that it has a directional control means.
[7] The wireless communication device according to claim 1, wherein,
The communication condition control means, as the communication condition, based on the set number of antennas of the antenna speed control unit, a wireless communication characterized by having a power supply control means for stopping power supply to the other remaining antennas apparatus.
[8] The wireless communication device according to claim 1, wherein,
Wherein the plurality of antenna elements of the antenna,
A feed element signal is fed, is provided apart a predetermined distance from the feeding device, includes at least one parasitic element signal is not powered,
Encapsulated or loaded into the dielectric, disposed at predetermined intervals to each other ヽ! The wireless communication device you wherein the Ru.
[9] In the radio communication apparatus according to claim 8,
The communication condition control means,
As the communication condition, the power supply side control means for controlling the directivity of the feed element provided in the m antennas,
As the communication condition, and the parasitic side control means for controlling the directivity of the parasitic element provided on the m antennas
Radio communication apparatus characterized by having a.
[10] In the radio communication apparatus according to claim 1,
The initial control means, as the initial state, the radio communication apparatus characterized by antenna each having directivity adjacent among the m antennas controls each antenna so as to overlap partially with each other.
[11] comprises a radio transmitting apparatus and radio receiving apparatus, a wireless communication system capable of communicating multiple input multiple output system,
At least one of the radio transmitting apparatus and the radio receiving apparatus,
When the m is 2 or more integer, and m-number of antennas including the encapsulated or armed each other! ヽ the dielectric multiple antenna elements placed at predetermined intervals, respectively, implemented throughout these m-number of antennas the directivity of an initial control means for controlling the Kakua antenna to a predetermined initial state,
Depending on the initial contents of communication with another wireless communication device in the initial state is realized by the initial control means, and a communication condition control means for setting communication conditions in the communication with the other wireless communication device
Wireless communication system, comprising a.
PCT/JP2007/055481 2006-03-17 2007-03-19 Wireless communication device and wireless communication system WO2007108430A1 (en)

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