JP2003092540A - Communication equipment, communication system and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide communication equipment in which required security can be kept corresponding to the characteristics of applications when performing processing corresponding to a plurality of applications. SOLUTION: In portable communication equipment 2, a transmitting signal is modulated in a modulation circuit 34 by a super wide band impulse communication system. In the portable communication equipment 2, when performing radio communication with a cash dispenser 3b, an antenna directional control circuit 39 sets an antenna 12 to have directivity by a control signal S32c from a control circuit 32. In the portable communication equipment 2, when performing radio communication with a personal computer 3a, on the other hand, the antenna directional control circuit 39 sets the antenna 12 to be non- directive by the control signal S32c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device, a communication system and a program for performing communication by a wireless system such as an ultra wide band impulse communication system.

[0002]

2. Description of the Related Art In recent years, a communication called a wireless personal area network has been put into practical use by using a device equipped with a short-range wireless communication device and having a wireless communication area within a range around the user's body. Such a short-range wireless communication device is mounted on a device such as a portable information terminal device or a notebook computer, and performs wireless communication. In this case, so that multiple devices can communicate without delay regardless of the positional relationship in a general home,
An omnidirectional antenna is used, and a predetermined fixed transmission power is used as the transmission power used when transmitting the short-range wireless communication.

[0003]

However, for example, if the portable information terminal device is used in a situation where security is important, such as a so-called wireless cash system in which payment procedure processing at a store or the like is wirelessly communicated, security is reduced. There is a problem that the related information may be transmitted to a wider area than necessary and may be illegally intercepted by another person.

The present invention has been made in view of the above-mentioned problems of the prior art, and when performing processing corresponding to a plurality of applications, a communication device, a communication system and a program capable of ensuring necessary security according to the characteristics of the applications. The purpose is to provide.

[0005]

In order to solve the above-mentioned problems of the prior art and to achieve the above-mentioned object, the communication device of the first invention comprises a modulation circuit for modulating a signal transmitted by a radio system. An antenna that transmits and receives a signal with a set directivity, and a control circuit that controls the setting of the directivity of the antenna based on a specified application.

The operation of the communication device of the first invention is as follows. First, the control circuit controls the directivity setting of the antenna based on the specified application. Then, in the modulation circuit, the signal transmitted by the wireless system is modulated. Next, the modulated signal is transmitted via the antenna with the directivity set for the antenna.

Further, in the communication apparatus of the first invention, preferably, the control circuit sets the antenna to a predetermined directivity or omnidirectional based on the designated application. To control.

Further, the communication device of the first invention preferably further comprises an input means, and the control circuit is based on an application designated via the input means,
Controlling the directivity setting of the antenna.

The communication device of the present invention is preferably
It further comprises a receiving circuit for receiving an application designating signal, and a demodulation circuit for demodulating the received application designating signal, wherein the control circuit is based on the application designated by the demodulated application designating signal. Controls antenna directivity settings.

The communication device of the present invention is preferably
The antenna drives at least one of the antenna unit and the radio wave reflection unit based on the control of the antenna unit, the radio wave reflection unit, and the control circuit, and the relative distance between the antenna unit and the radio wave reflection unit. And a drive unit that defines various positional relationships.

The communication device of the present invention is preferably
The control circuit further includes a power amplification circuit that amplifies transmission power of the modulated signal, and the control circuit controls the amplification by the power amplification circuit based on the designated application.

The communication device of the present invention is preferably
The modulation circuit includes a spreading code generation circuit that generates a signal of a predetermined spreading code sequence, a multiplication circuit that multiplies the signal to be transmitted by the spreading code sequence signal, and a level of the signal obtained by the multiplication. And a pulse generation circuit that generates a pulse signal having a corresponding predetermined cycle. Also, in the communication device of the present invention, preferably, the demodulation circuit is obtained by a despreading processing circuit that performs despreading processing on the received signal using the same signal as the spreading code sequence, and the despreading processing. And an integrating circuit for integrating the processed signal.

The communication system of the second invention is the first invention.
And a second modulation device, wherein the first communication device includes a first modulation circuit that modulates a first signal transmitted by a wireless method, and a set directivity. A first control circuit that controls the setting of the directivity of the antenna based on a designated application.
Communication device, a demodulation circuit that demodulates the received first signal, a second control circuit that performs processing based on the demodulated first signal to generate a second signal, and a wireless system. And a second antenna for transmitting the modulated second signal, and a second antenna for transmitting the modulated second signal.

The communication device according to the third aspect of the invention transmits and receives signals with a modulation circuit that modulates a signal transmitted by a wireless system, a demodulation circuit that demodulates the received signal, and a set directivity. When receiving the antenna and the authentication instruction, the first
Of the authentication signal is generated, the first authentication signal is output to the modulation circuit, the directivity setting of the antenna is controlled, and the demodulation circuit responds to the first authentication signal. And a control circuit that controls to retransmit the first authentication signal when it is determined that the second authentication signal is not properly received based on the result of demodulating the second authentication signal. Have.

In the communication device of the third invention, preferably, the control circuit determines that the second authentication signal is not properly received, and the number of times of transmission of the first authentication signal is If it is determined that the predetermined value is not exceeded, the first
The control is performed so that the authentication signal of is transmitted again. In the communication device of the third invention, preferably, the control circuit is
When it is determined that the second authentication signal has been properly received, control of transmitting a reception success notification signal to the transmission source of the second authentication signal is performed.

The communication system according to the fourth aspect of the invention is the first aspect.
And a second communication device, wherein the first communication device is a first modulation circuit that modulates a signal to be transmitted by a wireless system, and demodulates to demodulate a received signal. A first demodulation circuit, a first antenna for transmitting and receiving a signal with a set directivity, and a first authentication signal when the authentication instruction is received, and the first authentication signal is modulated by the modulation signal. The second authentication based on the result of outputting to a circuit, controlling the directivity setting of the antenna, and demodulating the second authentication signal according to the first authentication signal by the demodulation circuit. A first control circuit that controls the first authentication signal to be transmitted again when it is determined that the first communication signal has not been properly received, and the second communication device is configured to receive the received first communication signal. A second demodulation circuit for demodulating the authentication signal of 1; A second control circuit that performs processing based on one authentication signal to generate the second authentication signal; and a second modulation circuit that modulates the second authentication signal transmitted by a wireless method. , And a second antenna for transmitting the second authentication signal.

The fifth communication device includes a modulation circuit for modulating a signal to be transmitted by a radio system, an antenna for transmitting and receiving a signal with a set directivity, and the directivity of the antenna according to an instruction. And a control circuit for controlling the setting of. Further, the fifth communication device preferably further includes an input unit, and the control circuit controls the directivity setting of the antenna according to the instruction input via the input unit. . In the fifth communication device, preferably, the control circuit controls the antenna so as to be omnidirectional when transmitting data that is not related to security, and transmits the data related to security. The antenna is controlled so as to have a predetermined directivity.

The sixth communication system is a communication system having a first communication device and a second communication device, and the first communication device is a modulation device for modulating a signal transmitted by a wireless system. A circuit, a first antenna for transmitting and receiving a signal with a set directivity, and a first control circuit for controlling the setting of the directivity of the antenna according to an instruction, The communication device includes a second antenna that receives the signal, a demodulation circuit that demodulates the received signal,
A second control circuit that performs processing based on the demodulated signal.

[0019]

DETAILED DESCRIPTION OF THE INVENTION A communication system according to an embodiment of the present invention will be described below. First Embodiment FIG. 1 is a diagram for explaining an example of a usage pattern of a communication system 1 of the present embodiment. As shown in FIG. 1, in the communication system 1, for example, the portable communication device 2 and the personal computer 3a communicate with each other via the antennas 12 and 13a in an ultra wide band impulse communication system. In this case, the portable communication device 2 sets the antenna 12 in the omnidirectional mode and sets the transmission power in the high transmission power mode. Thereby, as shown in FIG. 2, a communicable area P_D1 having a radius R is obtained. Here, the portable communication device 2 corresponds to the communication device of the first and third inventions, and the first communication device of the second and fourth inventions.

Further, as shown in FIG. 3, the communication system 1
Then, for example, the portable communication device 2 and the cash dispenser 3b perform communication using data related to security such as personal authentication in the ultra wideband impulse communication system via the antennas 12 and 13b. In this case, the portable communication device 2 sets the antenna 12 in the directivity mode and sets the transmission power in the low transmission power mode. As a result, as shown in FIG. 4, a narrower communicable area P_D2 having directivity as compared with FIG. 2 is obtained. Here, the cash dispenser 3b corresponds to the second communication device of the present invention.

The ultra-wideband impulse communication system used in this embodiment is a radio technology capable of effectively utilizing frequency resources, and uses a signal composed of a pulse train having a very fine pulse width (for example, 1 ns or less) for baseband transmission. Is to do. It is a short-range wireless communication system having a bandwidth on the order of GHz such that a value obtained by dividing the occupied bandwidth by the center frequency (for example, 1 GHz to 10 GHz) becomes approximately 1.

[Portable Communication Device 2] FIG. 5 is shown in FIGS.
2 is a functional block diagram of the portable communication device 2 shown in FIG. Figure 5
As shown in, the portable communication device 2 includes, for example, the antenna 12, the input unit 31, the control circuit 32, the transmission buffer 33,
Modulation circuit 34, transmission power amplification circuit 35, switch circuit 3
6, a demodulation circuit 37, a transmission buffer 38, and an antenna pointing control circuit 39. Here, the input unit 31 corresponds to the authentication signal means of the present invention, the control circuit 32 corresponds to the control circuit and the first control circuit of the present invention, and the modulation circuit 34 is the modulation circuit and the first control circuit of the present invention. The transmission power amplification circuit 35 corresponds to the power amplification circuit and the first power amplification circuit of the present invention, the demodulation circuit 37 corresponds to the demodulation circuit and the first demodulation circuit of the present invention, and corresponds to the modulation circuit. The control circuit 39 corresponds to the control circuit of the present invention and the first control circuit of the present invention.

The antenna 12 has a configuration in which one of directivity and non-directivity can be selected and set based on the control signal S32c from the antenna 12. FIG. 6 is a diagram for explaining an example of the antenna 12, and FIG.
Shows the posture when the antenna 12 is set omnidirectional, and FIG. 6B shows the posture when the antenna 12 is set so as to have a predetermined directivity. As shown in FIG.
The antenna 12 includes a main body 52 and a pair of antenna parts 53.
a, 53b, and a connecting portion 54 for connecting the antenna portions 53a, 53b and the main body 52. The main body 52 is
It is composed of a front cover 56, an overhang portion cover 57, and a rear cover 58. The front cover 56 is made of a metal material that reflects radio waves. Convex support portions 60 are provided on both sides of the overhang portion cover 57. The connecting portion 54 is
It is rod-shaped, and is axially supported by the support portion 60 with its longitudinal direction left and right. The antenna portions 53a and 53b have their longitudinal directions orthogonal to the rotation axis P of the connecting portion 54, and have their one ends fixed to the connecting portion 54 in a parallel posture. In the antenna 12, the antenna parts 53a and 53b can be rotated about the rotation axis P by 180 degrees from the upper position of the rotation axis P to the lower position of the tip S thereof. The rotation is driven by the motor 70 based on the control signal S39 from the antenna pointing control circuit 39 of the portable communication device 2 shown in FIG. 5, for example. The antenna units 53a and 53b are set to the posture (D1) of FIG. 6A in the non-directional mode, and are set to the posture (D2) of FIG. 6B in the directional mode. The rear cover 58 of the antenna 12 may be, for example, the portable communication device 2
It is fixed to the back of the.

Further, the antenna 12 may have a structure adopting, for example, an adaptive array shown in FIG. As shown in FIG. 7, the antenna 1
2 includes, for example, a plurality of antennas 12_1 to 12_n, and the reception signals S90_1 of the antennas 12_1 to 12_n.
~ S90_n are weighted by the multiplication circuits 91_1 to 91_n, respectively, and the reception signals S91_1 to S91_n generated thereby are combined (added) by the combining circuit 92 to generate the reception signal S92. At this time, the weighting coefficient used in the multiplication circuits 91_1 to 91_n is determined by the weighting control circuit 93 using the data S95 and the reception signals S90_1 to S90_n so that the reception signal S92 has a predetermined directivity and quality. . The data S95 is, for example, the control circuit 3 based on the characteristics such as the waveform and spectrum required for the reception signal S92.
Generated by 2. Further, in the case of transmission, the antenna 12 causes the distributor 92 to multiply the transmission signal by the multiplication circuits 91_1 to 91_1.
It is distributed to 91_n, weighted by each, and transmitted from the antennas 12_1 to 12_n.

The input section 31 is, for example, an input means such as a button, and when the user presses the button, outputs an operation signal S31 indicating the button press to the control circuit 32. An authentication instruction is issued by pressing the button.

The control circuit 32 controls each component of the portable communication device 2. The control circuit 32 performs the following processing based on the procedure described in a predetermined program.
The control circuit 32, for example, communicates between the personal computer 3a shown in FIG. 1 and the application program AP1 that defines the process involving communication, and the cash dispenser 3b shown in FIG. 3 that uses data related to security such as personal authentication. The application program AP2 defining the processing involving is selectively executed based on the operation signal S31 from the input unit 31. Further, the control circuit 32 transmits the signal S32 to be transmitted according to the execution of the application programs AP1 and AP2, and the transmission buffer 33.
And the received signal S37 from the transmission buffer 38 is input.

The control circuit 32 also includes a switch circuit 36.
The control signal S32b for controlling whether to connect the transmission power amplifier circuit 35 and the antenna 12 or to connect the demodulation circuit 37 and the antenna 12 is output to the switch circuit 36. Further, the control circuit 32 outputs the control signal S32a indicating the high transmission power mode when the application program AP1 is executed, to the transmission power amplification circuit 3.
5, and outputs the control signal S32a indicating the low transmission power mode to the transmission power amplification circuit 35 when executing the application program AP2.

The control circuit 32 also outputs a control signal S32c indicating the non-directional mode to the antenna directivity control circuit 39 when executing the application program AP1, and a control signal indicating the directivity mode when executing the application program AP2. The S32c is output to the antenna pointing control circuit 39.

The transmission buffer 33 temporarily stores the signal S32 input from the control circuit 32, and then temporarily stores the signal S32.
Output to.

The modulation circuit 34 modulates the signal S32 input from the transmission buffer 33 by the ultra-wide band impulse communication system, and outputs the signal S34 obtained by the modulation to the transmission power amplification circuit 35.

FIG. 8 is a functional block diagram of the modulation circuit 34. 9 is a diagram showing signal waveforms in each circuit of the modulation circuit 34 shown in FIG. In addition, FIG.
11 is a diagram showing a signal spectrum of a data sequence in the modulation circuit 34 shown in FIG. 11, and FIG. 11 is a diagram showing the modulation circuit 34 shown in FIG.
It is a diagram showing a signal spectrum of the spread signal in,
FIG. 12 is a diagram showing a spectrum of a signal output from the modulation circuit 34 shown in FIG.

As shown in FIG. 8, the modulation circuit 34 includes, for example, a frequency synthesizer 1001, a spread code generator 1002,
It has a multiplier 1003 and a pulse generator 1004.
A bandpass filter may be provided after the pulse generator 1004.

The spreading code generator 1002 uses the frequency of the frequency synthesizer 1001 to generate the spreading code sequence SG1002 (see FIG. 9).
(B)) is output to the multiplier 1003. Multiplier 1003
Then, the signal S32 of the data series (FIGS. 9A and 10)
Is multiplied by a spread code sequence SG1002 to obtain a spread signal SG
1003 (FIGS. 9C and 11), the spread signal SG1003 is output to the pulse generator 1004.

In the pulse generator 1004, the spread signal SG
Corresponding to 0/1 of 1003, for example, a transmission signal S34 (FIG. 9) which is a very fine pulse signal of 100 ps.
(D), FIG. 12), which is output to the transmission power amplifier circuit 35 shown in FIG.

When the control signal S32a from the control circuit 32 indicates the high transmission power mode, the transmission power amplification circuit 35 amplifies the signal S34 so that the transmission power becomes high, and the signal S2 obtained by the amplification is amplified. Output to the switch circuit 36. In addition, the transmission power amplifier circuit 35 includes the control circuit 32.
When the control signal S32a from S1 indicates the low transmission power mode, the signal S34 is amplified so that the transmission power becomes low, and the signal S2 obtained by the amplification is output to the switch circuit 36.

The switch circuit 36 outputs the signal S2 from the transmission power amplifier circuit 35 to the antenna 12 based on the control signal S32b from the control circuit 32, and the first state,
One of the second state in which the signal S36 received by the antenna 12 is output to the demodulation circuit 37 is obtained.

The demodulation circuit 37 demodulates the signal S36 from the switch circuit 36 by the ultra wideband impulse communication system, and the signal S37 obtained by the demodulation is received by the reception buffer 38.
Output to.

FIG. 13 is a functional block diagram of the demodulation circuit 37 shown in FIG. 14 is a demodulation circuit 3 shown in FIG.
7 so-called DLL (Delay Lock Loo)
The main circuit 160 of the timing synchronization circuit having the configuration of p)
It is a figure which shows the correlation characteristic in 9.

The signal S36 from the switch circuit 36 is output to the bandpass filter 1602. Signal S36
Is output to the multipliers 1607, 1613, 1610 after the unnecessary components are removed by the bandpass filter 1602.

The spreading code generator 1604 outputs the spreading code sequence (the same spreading code sequence as the spreading code sequence used in the modulation circuit 34 shown in FIG. 5) to the pulse generator 1605 at the frequency of the frequency synthesizer 1603. The pulse generator 1605 generates a pulse, and at the same time, the spread code generator 160
The spread code sequence output from No. 4 is superimposed on the pulse and output to the delay units 1606, 1612 and the multiplier 1610.

The delay unit 1606 delays the pulse on which the spread code sequence is superimposed by ½ pulse width to multiply the multiplier 1607.
Output to. Further, the delay unit 1612 delays the pulse on which the spread code sequence is superimposed by one pulse width to multiply the multiplier 161.
Output to 3.

Therefore, the multiplier 1607 multiplies the reception signal by the pulse for demodulating the transmission data, which is superimposed with the spreading code sequence, and performs the despreading process. Also,
In the multiplier 1610, the output of the delay unit 1606 is 1/2
At the timing preceding the pulse width, the pulse on which the spreading code sequence is superimposed is multiplied by the received signal, and the despreading process is performed. Further, in the multiplier 1613, at the timing delayed by 1/2 pulse width from the output of the delay unit 1606, the pulse on which the spread code sequence is superimposed is multiplied by the received signal, and despreading processing is performed.

The multiplication result of the multiplier 1607 is the integrator 16
08, and the signal S3 is integrated by the integrator 1608.
7 is output to the transmission buffer 38. Multiplier 161
The multiplication result of 0 is output to the integrator 1611 and the integrator 1
It is integrated in 611 and output to the differencer 1615 (see FIG. 1).
4 1702). The multiplication result of the multiplier 1613 is output to the integrator 1614, integrated by the integrator 1614, and output to the difference unit 1615 (1701 in FIG. 14).

In the differencer 1615, the difference between the output of the integrator 1611 and the output of the integrator 1614 (1703 in FIG. 14:
The solid line) is taken and the difference is output to the loop filter 1616. As can be seen from FIG. 14, the phase shift (horizontal axis)
The output (vertical axis) responds linearly to. Therefore, the output (difference) obtained by filtering this difference by the loop filter 1616 is fed back to the frequency synthesizer 1603.

In the frequency synthesizer 1603, if the output of the loop filter 1616 is positive, the generation phase of the spreading code sequence is delayed a little, and if it is negative, the generation phase of the spreading code sequence is advanced a little. As a result, the loop filter 16
The output (difference) of 16 becomes zero, and the pulse of the spread code sequence supplied to the multiplier 1607 and the phase of the received signal are aligned, and the despread output becomes maximum.

In the above example, the case where the signal is modulated and demodulated by the bi-face method is illustrated, but in the present invention, the signal may be modulated and demodulated by the PP (Pulse Position) modulation method.

The reception buffer 38 receives the demodulated signal S37 from the demodulation circuit 37, temporarily stores it, and then outputs it to the control circuit 32.

The antenna pointing control circuit 39 is the control circuit 3
When the control signal S32c from 2 indicates the non-directional mode, for example, the control signal S39 for setting the antenna 12 to the posture D1 shown in FIG.
Further, when the control signal S32c from the control circuit 32 indicates the pointing mode, the antenna pointing control circuit 39, for example, positions the antenna 12 in the posture D2 shown in FIG. 6B.
A control signal S39 for turning on is output to the motor 70.

[Personal Computer 3a] FIG.
FIG. 2 is a functional block diagram of the personal computer 3a shown in FIG. As shown in FIG. 15, the personal computer 3a includes an antenna 13a, a control circuit 132, a transmission buffer 133, a modulation circuit 134, and a transmission power amplification circuit 1.
35, a switch circuit 136, a demodulation circuit 137, and a transmission buffer 138.

The antenna 13a is, for example, an omnidirectional antenna having a communicable area P_D1 as shown in FIG.

The control circuit 132 controls each component of the personal computer 3a. The control circuit 132 executes, for example, an application program AP1 ′ that defines a process involving communication with the portable communication device 2 described above. In addition, the control circuit 132 connects the transmission power amplifier circuit 135 and the antenna 13a by the switch circuit 136, or alternatively, the demodulation circuit 137 and the antenna 13a.
A control signal S132a for controlling whether or not is connected is output to the switch circuit 136. In addition, the control circuit 132
During execution of the application program AP1 ′,
The signal S132 is output to the transmission buffer 133, and the signal S137 is input from the reception buffer 138.

The transmission buffer 133 temporarily stores the signal S132 from the control circuit 132, and then the modulation circuit 1
To 34.

The modulation circuit 134 has the same structure as the modulation circuit 34 shown in FIG. The modulation circuit 134 modulates the signal S132 input from the transmission buffer 133 by the ultra-wideband impulse communication system, and outputs the signal S134 obtained by the modulation to the transmission power amplification circuit 135.

The transmission power amplifier circuit 135 controls the control signal S13.
4 is amplified so as to have a predetermined high transmission power, and the signal S3a obtained by the amplification is output to the switch circuit 136.

The switch circuit 136 demodulates the first state in which the signal S3a from the transmission power amplification circuit 135 is output to the antenna 13a and the signal S136 received by the antenna 13a, based on the control signal S132a from the control circuit 132. One of the second state output to the circuit 137 and the second state.

The demodulation circuit 137 is the demodulation circuit 3 shown in FIG.
It has the same configuration as 7. The demodulation circuit 137 demodulates the signal S136 from the switch circuit 136 by the ultra wideband impulse communication system, and the signal S1 obtained by the demodulation.
37 is output to the transmission buffer 138.

The reception buffer 138 temporarily stores the signal S137 from the demodulation circuit 137 and then stores it in the control circuit 1.
To 32.

[Cash Dispenser 3b] FIG. 16
FIG. 4 is a functional block diagram of the cash dispenser 3b shown in FIG. As shown in FIG. 16, the cash dispenser 3b includes an antenna 13b, a control circuit 232,
It has a transmission buffer 233, a modulation circuit 234, a transmission power amplification circuit 235, a switch circuit 236, a demodulation circuit 237, and a transmission buffer 238. Here, the control circuit 232
Corresponds to the second control circuit of the present invention, the modulation circuit 234 corresponds to the second modulation circuit of the present invention, and the transmission power amplification circuit 2
Reference numeral 35 corresponds to the second power amplifier circuit of the present invention, and demodulation circuit 237 corresponds to the second demodulation circuit of the present invention.

The antenna 13b is, for example, a directional antenna having a communicable area P_D2 as shown in FIG.

The control circuit 232 controls each component of the cash dispenser 3b. The control circuit 232 is
For example, as shown in FIG. 3, an application program A that defines an authentication process performed by communicating with the portable communication device 2.
Execute P2 '. Further, the control circuit 232 causes the switch circuit 236 to switch the control signal S232a for controlling whether the transmission power amplifier circuit 235 and the antenna 13b are connected or the demodulation circuit 237 and the antenna 13b are connected. Output to 236. Also,
The control circuit 232 uses the application program AP.
During the execution of 2 ′, the signal S232 is output to the transmission buffer 233 and the signal S237 is input from the reception buffer 238.

The transmission buffer 233 temporarily stores the signal S232 from the control circuit 232.
To 34.

The modulation circuit 234 has the same structure as the modulation circuit 34 shown in FIG. The modulation circuit 234 modulates the signal S232 input from the transmission buffer 233 by the ultra-wideband impulse communication method, and outputs the signal S234 obtained by the modulation to the transmission power amplification circuit 235.

The transmission power amplifier circuit 235 has a control signal S23.
4 is amplified so as to have a low transmission power lower than the high transmission power, and the signal S3b obtained by the amplification is output to the switch circuit 236.

Based on the control signal S232a from the control circuit 232, the switch circuit 236 demodulates the first state in which the signal S3b from the transmission power amplification circuit 235 is output to the antenna 13b and the signal S236 received by the antenna 13b. One of the second state output to the circuit 237 and the second state.

The demodulation circuit 237 is the demodulation circuit 3 shown in FIG.
It has the same configuration as 7. The demodulation circuit 237 demodulates the signal S236 from the switch circuit 236 by the ultra-wideband impulse communication system, and the signal S2 obtained by the demodulation.
37 is output to the transmission buffer 238.

The reception buffer 238 temporarily stores the signal S237 from the demodulation circuit 237, and then the control circuit 2
To 32.

Hereinafter, an operation example of the communication system 1 of the present embodiment will be described. [First Operation Example] In the operation example, a case where the user presses the authentication button of the input unit 31 of the portable communication device 2 illustrated in FIG. 5 will be described. FIG. 17 is a flowchart for explaining the operation example. Step ST1: When the user presses the authentication button of the input unit 31 of the portable communication device 2 in FIG. 5, an operation signal S31 indicating that is output from the input unit 31 to the control circuit 32.

Step ST2: When the control circuit 32 receives the operation signal S31 in step ST1, the control circuit 32 internally generates an authentication instruction.

[Second Operation Example] In the operation example, as shown in FIGS.
As shown in FIG. 4, an operation example when the portable communication device 2 communicates with the personal computer 3a and the cash dispenser 3b will be described. FIG. 18 is a flowchart for explaining the operation example. Step ST21: The control circuit 32, as an initial setting,
The control signal S32a indicating the high transmission power mode is output to the transmission power amplification circuit 35. As a result, the transmission power amplification circuit 35 is set to amplify the signal with the high transmission power L1.

Step ST22: The control circuit 32 outputs the control signal S32c indicating the non-directional mode to the antenna directivity control circuit 39 as an initial setting. As a result, the antenna pointing control circuit 39 outputs a control signal S39 for setting the antenna 12 to the posture D1 shown in FIG. 6A to the motor 70 of the antenna 12. As a result, the antenna 12 is
The posture D1 shown in (A) is obtained, and the communicable area P_D1 shown in FIG. 2 is obtained.

Step ST23: The control circuit 32 executes the first
It is determined whether or not the authentication instruction described in the operation example is generated. If it is determined that the authentication instruction is generated, the process proceeds to step ST24. If not, the process proceeds to step ST27.

Step ST24: The control circuit 32 outputs the control signal S32a indicating the low transmission power mode for authentication to the transmission power amplification circuit 35. As a result, the transmission power amplifier circuit 35 is set to amplify the signal with the low transmission power L2.

Step ST25: The control circuit 32 outputs the control signal S32c indicating the pointing mode to the antenna pointing control circuit 39. As a result, the antenna pointing control circuit 3
9 outputs a control signal S39 for setting the antenna 12 to the posture D2 shown in FIG. 6B to the motor 70 of the antenna 12. As a result, the antenna 12 becomes the posture D2 shown in FIG. 6B, and the communicable area P_D2 shown in FIG. 4 is obtained.

Step ST26: The portable communication device 2
The control circuit 32 executes the application program AP2, and exchanges a signal used for authentication with the cash dispenser 3b. At this time, step ST
With the setting of 23, the signal transmitted from the portable communication device 2 to the cash dispenser 3b is amplified to have low transmission power, and the communicable range P_D2 having directivity shown in FIG. 4 is obtained. As a result, communication range P
A signal used for the authentication cannot be intercepted from outside _D2. That is, security at the time of authentication can be increased.

Step ST27: The control circuit 32 judges, based on the signal S37 from the transmission buffer 38, whether or not the signal from the personal computer 3a is received, and if it is judged that the signal is received, the process of step ST28. If not, the process returns to step ST23 if not.

Step ST28: The portable communication device 2
The control circuit 32 executes the application program AP1 to exchange signals with the personal computer 3a. At this time, depending on the setting in step ST25,
The signal transmitted from the portable communication device 2 to the personal computer 3a is amplified so as to have high transmission power, and the antenna 12 is omnidirectional. Therefore, the communicable range P_D1 shown in FIG. 2 is obtained, and communication is possible in a wide range such as at home.

[Third Operation Example] In this operation example, a case will be described in which, in the cases of FIGS. 3 and 4, authentication is performed between the portable communication device 2 and the cash dispenser 3b using the authentication key. 19 to 21 are flowcharts for explaining the operation example. Step ST3
1: The control circuit 32 of the portable communication device 2 illustrated in FIG. 5 determines whether or not the authentication instruction described in the first operation example is generated, and when it is determined that the authentication instruction is generated, the process of step ST32 is performed. If not, the process of step ST31 is repeated.

Step ST32: The control circuit 32 of the portable communication device 2 outputs the control signal S32a indicating the low transmission power mode for authentication to the transmission power amplification circuit 35. As a result, the transmission power amplifier circuit 35 is set to amplify the signal with the low transmission power L2.

Step ST33: The control circuit 32 outputs the control signal S32c indicating the pointing mode to the antenna pointing control circuit 39. As a result, the antenna pointing control circuit 3
9 outputs a control signal S39 for setting the antenna 12 to the posture D2 shown in FIG. 6B to the motor 70 of the antenna 12. As a result, the antenna 12 becomes the posture D2 shown in FIG. 6B, and the communicable area P_D2 shown in FIG. 4 is obtained.

Step ST34: The portable communication device 2
The control circuit 32 executes the application program AP2, and in response to the execution, the cash dispenser 3
An authentication signal S32 (first authentication signal of the present invention) including the authentication key A used for authentication with b is output from the control circuit 32 to the modulation circuit 34 via the transmission buffer 33.
Then, in the modulation circuit 34, the authentication signal S32 is modulated, and the authentication signal S34 obtained by the modulation is output to the transmission power amplification circuit 35.

Step ST35: In the transmission power amplifier circuit 35 of the portable communication device 2, the authentication signal S34 is amplified to generate the authentication signal S2. At this time, the authentication signal S34 is amplified to have low transmission power by the setting in step ST32.

Step ST36: The authentication signal S2 generated in step ST34 is transmitted via the switch circuit 36 and the antenna 12 of the portable communication device 2, and FIG.
Antenna S13 of the cash dispenser 3b shown in FIG.
It is received at b. At this time, as shown in FIG. 4, a signal is transmitted from the portable communication device 2 via the antenna 12 with directivity as shown in FIG. As a result, the authentication signal S2 cannot be intercepted from outside the communicable range P_D2 shown in FIG.

Step ST37: The authentication signal S236 (S2) received in step ST36 is the switch circuit 236 of the cash dispenser 3b shown in FIG.
Is output to the demodulation circuit 237 via. Then, the demodulation circuit 237 demodulates the authentication signal S236 to generate the authentication signal S237. The authentication signal S23
7 is output to the control circuit 232 via the transmission buffer 238.

Step ST38: The control circuit 232 of the cash dispenser 3b shown in FIG.
The authentication key A included in the authentication signal S237 input at T36 is used to generate the authentication key B, and the authentication signal S232 including the authentication key B (the second authentication signal of the present invention) is transmitted to the transmission buffer 233. To the modulation circuit 234 via.

Step ST39: In the modulation circuit 234 of the cash dispenser 3b, the authentication signal S23.
2 is modulated, and the authentication signal S obtained by the modulation
234 is output to the transmission power amplifier circuit 235.

Step ST40: The transmission power amplifier circuit 235 of the cash dispenser 3b amplifies the authentication signal S234 to generate the authentication signal S3b. At this time, the authentication signal S234 is the low transmission power L2.
To be amplified.

Step ST41: The authentication signal S3b generated in step ST40 is transmitted with directivity via the switch circuit 136 of the cash dispenser 3b and the antenna 13a, and the antenna 12 of the portable communication device 2 shown in FIG. Will be received at. At this time, as shown in FIG. 4, the communicable range P_D2 of the signal transmitted from the cash dispenser 3b becomes the radius r. As a result, the authentication signal S is transmitted from outside the communicable range P_D2.
Cannot intercept 3b.

Step ST42: The authentication signal S36 (S3b) received in step ST41 is sent to the demodulation circuit 3 via the switch circuit 36 of the portable communication device 2 shown in FIG.
7 is output. Then, in the demodulation circuit 37, the authentication signal S36 is demodulated to generate the authentication signal S36, which is output to the control circuit 32 via the transmission buffer 38.

Step ST43: Whether the control circuit 32 has properly obtained the authentication key B included in the authentication signal S36 input in step ST42, that is, the authentication signal S
It is determined whether 36 is properly received. If it is determined that 36 is properly received, the process proceeds to step ST45. If not, the process proceeds to step ST45. Based on whether the control circuit 32 receives the authentication signal S36 within a predetermined time after transmitting the authentication signal S2,
Make the above judgment.

Step ST44: The control circuit 32 judges whether or not the number of times it is judged that the signal was not properly received in step ST43 is a predetermined number N or less, and when it is judged to be N or less. Returns to the process of step ST32, and otherwise returns to step ST31.

Step ST45: The control circuit 32 generates the reception success notification signal S32 and sends it to the transmission buffer 33.
To the modulation circuit 34 via.

Step ST46: The modulation circuit 34 modulates the reception success notification signal S32, and the reception success notification signal S34 obtained by the modulation is output to the transmission power amplification circuit 35.

Step ST47: In the transmission power amplifier circuit 35 of the portable communication device 2, the reception success notification signal S34.
Is amplified and a reception success notification signal S2 is generated. At this time, the reception success notification signal S34 is amplified to have low transmission power by the setting of step ST32, and the communication range P_D2 having directivity is obtained as shown in FIG. 4 by the setting of step ST33. To be As a result, the signal used for the authentication cannot be intercepted from outside the communicable range P_D2.

Step ST49: The reception success notification signal S2 generated in step ST47 is transmitted via the switch circuit 36 and the antenna 12 of the portable communication device 2,
It is received by the antenna S13b of the cash dispenser 3b shown in FIG.

As described above, according to the communication system 1, the portable communication device 2 is connected to the personal computer 3
When communicating with a, the cash dispenser 3b
The directivity of the antenna 12 and the transmission power are switched between when communicating with the personal computer 3
When communicating with a, a wide omnidirectional communication range can be obtained, and when communicating with the cash dispenser 3b, a narrow directional communication range can be obtained, and security can be improved. .

The present invention is not limited to the above embodiments. For example, in the above-described embodiment, as described with reference to FIG. 15, a case where the control circuit 32 generates an authentication instruction based on the user pressing the button of the input unit 31 is illustrated, but as illustrated in FIG. In addition, for example, the control circuit 32 may generate the authentication instruction based on the authentication instruction signal (the application designation signal of the present invention) transmitted by the cash dispenser 3b. The process of FIG. 22 will be described below. When the signal S36 is received by the antenna 12 (step ST51), the portable communication device 2 demodulates the signal by the demodulation circuit 37 to generate the signal S37 (step ST52). Then, the control circuit 32 determines whether or not the signal S37 is an authentication instruction signal (step ST53), and when it is determined to be an authentication signal, issues an authentication instruction (step ST54).

In the above-described embodiment, the case where the directivity of the antenna is controlled based on the designated application has been described. However, the portable communication device 2 shown in FIG. 5 is used instead of the designated application. The control circuit 32 may control the directivity of the antenna based on only pressing of the button provided on the input unit 31 of FIG. FIG. 23
6 is a flow chart for explaining an operation example of the portable communication device 2 shown in FIG. 5 in such a case. Step ST61: The control circuit 32 of the portable communication device 2 determines whether or not the button of the input unit 31 shown in FIG. 5 has been pressed,
If it is determined that the button has been pressed, the process proceeds to step ST62, and if not, the process proceeds to step ST63.

Step ST62: The control circuit 32 outputs the control signal S32c indicating the directivity mode for authentication to the antenna directivity control circuit 39. As a result, the antenna pointing control circuit 39 sets the antenna 12 to have a predetermined directivity.

Step ST63: The control circuit 32 outputs the control signal S32c indicating the normal non-directional mode to the antenna directivity control circuit 39. As a result, the antenna pointing control circuit 39 sets the antenna 12 to be omnidirectional.

Step ST64: The control circuit 32 outputs the signal to be transmitted to the transmission power amplification circuit 35 via the transmission buffer 33 and the modulation circuit 34, and step ST6
2 or transmit from the antenna 12 with the directivity set in ST63. That is, according to the above-described operation example, when the user presses the button of the input unit 31, the antenna 12 has the predetermined directivity shown in FIG. 4 and makes it difficult to intercept the signal used for the authentication. That is, security at the time of authentication can be increased. On the other hand, if the user does not press the button of the input unit 31,
As shown in, the signal is omnidirectional and the signal is transmitted in a wide range.

Further, for example, in the above-described embodiment, the case where the portable communication apparatus 2 communicates with the personal computer 3a and the case where the portable communication apparatus 2 communicates with the cash dispenser 3b, the transmission power is switched between L1 and L2. Although illustrated, when the portable communication device 2 communicates with three or more communication devices, three or more transmission powers may be switched and used. Further, in the above-described embodiment, the ultra-wideband impulse communication system is illustrated as the predetermined wireless communication system, but in addition, OFDM (Orthogonal Frequency Division) is used.
Multiplexing) method or spread spectrum method may be used.

Further, in the above-described embodiment, the case where the authentication keys A and B are transmitted and received is illustrated as an example of the acceptance process between the portable communication device 2 and the cash dispenser 3b. You may send and receive the processed data using a key.

Further, the structure of the antenna of the present invention is not limited to those shown in FIGS. 6 and 7 and may be any one that can change the directivity.

[0104]

As described above, according to the present invention, it is possible to provide a communication device, a communication system, and a program capable of ensuring necessary security according to the characteristics of an application when processing corresponding to a plurality of applications is performed.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an example of a usage pattern of a communication system according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a communicable range in the case shown in FIG.

FIG. 3 is a diagram for explaining another example of usage of the communication system according to the embodiment of the present invention.

FIG. 4 is a diagram for explaining a communicable range in the case shown in FIG.

FIG. 5 is a functional block diagram of the portable communication device shown in FIGS. 1 to 4.

FIG. 6 is a diagram for explaining the antenna shown in FIG.

FIG. 7 is a diagram for explaining another example of the antenna shown in FIG.

FIG. 8 is a functional block diagram of the modulation circuit shown in FIG.

9 is a signal waveform diagram of the modulation circuit shown in FIG.

10 is a diagram showing a signal spectrum of a data sequence in the modulation circuit shown in FIG.

FIG. 11 is a diagram showing a signal spectrum of a spread signal in the modulation circuit shown in FIG.

12 is a diagram showing a spectrum of a signal output from the modulation circuit shown in FIG.

13 is a functional block diagram of the demodulation circuit shown in FIG.

14 is a diagram showing a correlation characteristic in a main circuit of a timing synchronization circuit having a so-called DLL (Delay LockLoop) configuration of the demodulation circuit shown in FIG.

FIG. 15 is a functional block diagram of the personal computer shown in FIG. 1.

FIG. 16 is a functional block diagram of the cash dispenser shown in FIG. 1.

17 is a flowchart for explaining an operation example when the user presses the authentication button of the input unit of the portable communication device in FIG. 5.

FIG. 18 is a flowchart for explaining an operation example when the portable communication device 2 communicates with a personal computer and a cash dispenser as shown in FIGS. 1 to 4.

FIG. 19 shows the case of FIG. 3 and FIG.
It is a flowchart for demonstrating the case where authentication is performed between a portable communication device and a cash dispenser using an authentication key.

FIG. 20 is a diagram showing the case of FIG. 3 and FIG.
It is a flowchart for demonstrating the case where authentication is performed between a portable communication device and a cash dispenser using an authentication key.

FIG. 21 is a diagram showing the case of FIG. 3 and FIG.
It is a flowchart for demonstrating the case where authentication is performed between a portable communication device and a cash dispenser using an authentication key.

FIG. 22 is a flow chart for explaining another example when an authentication instruction is issued in the embodiment of the present invention.

FIG. 23 is a diagram for explaining another embodiment of the present invention.

[Explanation of symbols]

1 ... Communication system, 2 ... Portable communication device, 3a ... Personal computer, 3b ... Cash dispenser,
12, 13a, 13b ... Antenna, 31 ... Input section, 32
... control circuit, 33 ... transmission buffer, 34 ... modulation circuit, 3
5 ... Transmission power amplification circuit, 36 ... Switch circuit, 37 ... Demodulation circuit, 38 ... Transmission buffer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04L 12/28 100 H04L 12/28 300Z 5K059 300 H04M 1/00 R H04M 1/00 H04J 13/00 DF Terms (reference) 5J021 AA02 AA05 AB02 BA01 DA03 DA04 DA05 DA07 DB01 EA02 FA16 FA32 GA01 GA07 HA05 5K011 AA06 BA10 DA11 DA15 JA01 5K022 EE01 EE21 EE31 5K027 AA11 BB04 DB01 CB01 DB01 CB01 DB01 CB01 DB01 BA04 BA02 BA04 BA02 BA04 BA02 BA04 BA02 BA04 CC04 DD07 DD32

Claims (27)

[Claims] 1. A modulation circuit for modulating a signal transmitted by a wireless system, an antenna for transmitting and receiving a signal with a set directivity, and control of the directivity setting of the antenna based on a designated application. Device having a control circuit for controlling. 2. The communication device according to claim 1, wherein the control circuit controls the antenna so as to be set to either one of a predetermined directivity and a non-directivity based on the designated application. 3. The communication device according to claim 1, further comprising an input unit, wherein the control circuit controls the directivity setting of the antenna based on an application designated via the input unit. 4. A reception circuit that receives an application designation signal, and a demodulation circuit that demodulates the received application designation signal, wherein the control circuit is an application designated by the demodulated application designation signal. On the basis of,
The communication device according to claim 1, wherein setting of directivity of the antenna is controlled. 5. The antenna drives at least one of the antenna section and the radio wave reflection section under the control of the antenna section, the radio wave reflection section, and the control circuit, and the antenna section and the radio wave reflection section are driven. The communication device according to claim 1, further comprising a drive unit that defines a relative positional relationship with the unit. 6. A power amplifier circuit for amplifying the transmission power of the modulated signal, further comprising: a control circuit for controlling the amplification by the power amplifier circuit based on the designated application. The communication device according to claim 1. 7. The communication device according to claim 1, wherein the control circuit executes a process defined by an application program corresponding to the application. 8. The communication device according to claim 1, wherein the modulation circuit modulates the signal to be transmitted by an ultra wideband impulse communication system. 9. The modulation circuit comprises: a spreading code generation circuit for generating a signal of a predetermined spreading code sequence; a multiplication circuit for multiplying the signal to be transmitted by the signal of the spreading code sequence; and a multiplication circuit obtained by the multiplication. 9. The communication device according to claim 8, further comprising a pulse generation circuit that generates a pulse signal having a predetermined cycle corresponding to the level of the signal. 10. The communication device according to claim 4, wherein the demodulation circuit demodulates the received signal by an ultra wideband impulse communication system. 11. The demodulation circuit includes a despreading processing circuit for performing despreading processing on the received signal using the same signal as the spreading code sequence, and an integration processing for integrating the signal obtained by the despreading processing. The communication device according to claim 10, comprising a circuit. 12. The communication device according to claim 1, wherein the designated application is an application for conducting a money transaction by a wireless system. 13. A communication system having a first communication device and a second communication device, wherein the first communication device comprises a first modulation circuit for modulating a first signal transmitted by a radio system, A first antenna that transmits and receives a signal with a set directivity; and a first control circuit that controls the setting of the directivity of the antenna based on a designated application, the second antenna The communication device includes a demodulation circuit that demodulates the received first signal, and a second demodulation circuit that performs processing based on the demodulated first signal.
A second control circuit for generating the signal of No. 2, a second modulation circuit for modulating the second signal transmitted by a wireless method, and a second antenna for transmitting the modulated second signal. Communications system. 14. A program for causing a computer to execute a procedure for controlling directivity setting of the antenna based on a specified application when transmitting and receiving a signal via the antenna. 15. A modulation circuit for modulating a signal transmitted by a wireless system, a demodulation circuit for demodulating a received signal, an antenna for transmitting and receiving a signal with a set directivity, and an authentication instruction when received. A first authentication signal is generated, the first authentication signal is output to the modulation circuit, the directivity setting of the antenna is controlled, and the demodulation circuit responds to the first authentication signal. A control circuit for controlling to retransmit the first authentication signal when it is determined that the second authentication signal is not properly received based on the result of demodulating the second authentication signal. And a communication device having. 16. The control circuit determines that the second authentication signal is not properly received, and determines that the number of times the first authentication signal is transmitted does not exceed a predetermined value. The communication device according to claim 15, wherein the communication device controls to retransmit the first authentication signal. 17. The control circuit, when determining that the second authentication signal has been properly received, controls the transmission of a reception success notification signal to the transmission source of the second authentication signal. The communication device according to claim 15. 18. The communication according to claim 15, further comprising an input unit, wherein the control circuit controls the directivity setting of the antenna based on an authentication instruction input via the input unit. apparatus. 19. A receiving circuit for receiving an authentication instruction signal, and a demodulation circuit for demodulating the received authentication instruction signal, wherein the control circuit is configured to perform the operation based on the demodulated authentication instruction signal. The communication device according to claim 15, which controls setting of the directivity of an antenna. 20. A power amplification circuit that amplifies the transmission power of the modulated first authentication signal, wherein the control circuit performs the amplification by the power amplification circuit based on the designated application. The communication device according to claim 15, which controls the communication. 21. The communication device according to claim 15, wherein the control circuit controls the antenna so as to be set to one of a predetermined directivity and omnidirectional, based on the designated application. 22. In a communication system having a first communication device and a second communication device, the first communication device comprises a first modulation circuit for modulating a signal transmitted by a wireless system, and a received signal. A first demodulation circuit that demodulates a signal, a first antenna that transmits and receives a signal with a set directivity, and a first authentication signal is generated when an authentication instruction is received, and the first authentication is performed. Based on the result of demodulating a second authentication signal corresponding to the first authentication signal by the demodulation circuit by outputting a use signal to the modulation circuit, controlling the directivity setting of the antenna, And a first control circuit that controls to retransmit the first authentication signal when it is determined that the second authentication signal is not properly received, and the second communication device includes A second demodulation for demodulating the received first authentication signal A circuit, a second control circuit that performs processing based on the demodulated first authentication signal to generate the second authentication signal, and a second authentication signal that is transmitted by a wireless method. A communication system having a second modulation circuit for modulating, and a second antenna for transmitting the second authentication signal. 23. A modulation circuit for modulating a signal transmitted by a wireless system, an antenna for transmitting and receiving a signal with a set directivity, and a control circuit for controlling the setting of the directivity of the antenna according to an instruction. And a communication device having. 24. The communication according to claim 23, further comprising input means, wherein the control circuit controls setting of the directivity of the antenna in accordance with the instruction input via the input means. apparatus. 25. The control circuit controls the antenna to be omnidirectional when transmitting data not related to security, and sets the antenna to have a predetermined directivity when transmitting data related to security. The communication device according to claim 23, wherein the communication device is controlled to be set to. 26. A communication system having a first communication device and a second communication device, wherein the first communication device has a modulation circuit for modulating a signal transmitted by a wireless system, and a set directivity. A first antenna for transmitting and receiving a signal; and a first control circuit for controlling the setting of the directivity of the antenna according to an instruction, wherein the second communication device receives the signal A communication system comprising a second antenna, a demodulation circuit that demodulates the received signal, and a second control circuit that performs processing based on the demodulated signal. 27. A program for causing a computer to execute a procedure for controlling the directivity setting of the antenna according to an instruction when transmitting and receiving a signal via the antenna.