JP2001069053A - Directional antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount a directional antenna system to existing radio equipment not adopting an adaptive array antenna without revising the entire system of the radio equipment. SOLUTION: A frequency converter 15 converts a plurality of received signals by each antenna element 13 into a signal with a low frequency, an A/D converter 16 converts each of the signal into a digital signal and gives the digital signal to a digital signal processing section 17. The digital signal processing section gives weighting to an amplifier and a phase so that the directivity can optimally be controlled to each signal. A D/A converter 18 converts each weighted signal from the digital signal processing section into an analog signal, an adder 19 sums the signals, a frequency converter 20 converts the sum into a signal with an RF frequency for radio equipment 12 and the converted signal is fed to a frequency converter 124 of the radio equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional antenna device used for a base station of a radio communication system for performing data communication between a base station and a plurality of terminal stations.

[0002]

2. Description of the Related Art In wireless communication systems such as mobile communication and indoor wireless communication, an adaptive array antenna is used as an antenna for effective use of frequency, countermeasures for multipath fading, or removal of co-channel interference waves. For example, Japanese Patent Application Laid-Open No. 9-219615 describes that, in a wireless communication system for performing communication between a base station and a terminal station, an adaptive array transmitting / receiving device including an adaptive array antenna is provided in the base station.

That is, in this publication, as shown in FIG. 16, transmission and reception signals of a plurality of antenna elements 1 are weighted by a weighter 2 for amplitude and phase, and transmitted and received by a transmission and reception unit 3 for modulating and demodulating signals. The transmission signal is distributed by the distribution / synthesis unit 4 and weighted by the weighting unit 2 for amplitude and phase, and then output to the antenna element 1. The received signal from the antenna element 1 is weighted by the weighting unit 2 for amplitude and phase. , An adaptive array transmitting / receiving device that combines the signals in the distribution / combining unit 4 and outputs the combined signals to the transmitting / receiving unit 3 is provided in the base station. The reference signal is transmitted, a weighting factor is calculated by the external arithmetic unit 5 based on the received signal of the reference signal of the adaptive array transmitting / receiving apparatus, and the Is that performs directivity control by setting the weighting units 2 through 6.

[0004]

Conventionally, when an adaptive array antenna is used as an antenna, the transmission / reception system of a base station or a terminal station is configured as a base station or a terminal station having an adaptive array transmission / reception apparatus from the beginning. Although there is no problem, if an adaptive array antenna is used in a base station or terminal station where an existing wireless device that does not employ such an adaptive array antenna is installed, the existing transmission / reception system of the base station or terminal station is diverted. Since it is impossible, there is a problem that the entire system of the base station and the terminal station must be changed.

Accordingly, the present invention is directed to a directional antenna device which can be easily attached to an existing wireless device which does not employ an adaptive array antenna without changing the entire system of the wireless device. provide.
Further, the inventions according to claims 2 to 4 and 7 to 12 provide a directional antenna device that can stably weight the amplitude and the phase, and can further reduce the size of the device.

Further, the invention according to claims 4, 9 and 12 further provides a directional antenna device which can easily rewrite a preset weighting coefficient and can perform a weighting process suitable for a radio wave propagation environment. Further, the invention according to claim 13 further provides a directional antenna device capable of giving a degree of freedom in changing an installation position by performing an interface with the outside by optical communication.

[0007]

According to the first aspect of the present invention,
In a directional antenna device that controls directivity using a plurality of antenna elements, a first reception frequency conversion unit that converts a frequency of a signal received by each antenna element, and a first reception frequency conversion unit. Weighting means for weighting the phase and amplitude of each signal obtained by the conversion, adding means for adding the signals weighted by the weighting means, and a signal obtained by adding the signals by the adding means using a frequency-variable local oscillator. And a second receiving frequency converting means for performing frequency conversion.

According to a second aspect of the present invention, there is provided a directional antenna apparatus for controlling directivity using a plurality of antenna elements, wherein first frequency conversion means for converting the frequency of a signal received by each antenna element is provided. An analog / digital conversion means for converting each signal converted by the first reception frequency conversion means into a digital signal, a digital signal converted by the conversion means; Digital signal processing means for weighting the amplitude, digital / analog conversion means for converting each signal processed by the digital signal processing means into an analog signal, and addition for adding the analog signals converted by the conversion means And a second receiver for frequency-converting the signal added by the adding means using a frequency-variable local oscillator. In that a use frequency converting means.

According to a third aspect of the present invention, there is provided a directional antenna apparatus for controlling directivity using a plurality of antenna elements, comprising: first receiving frequency conversion means for converting a frequency of a signal received by each antenna element; An analog / digital conversion means for converting each signal converted by the first reception frequency conversion means into a digital signal, a digital signal converted by the conversion means; Weight the amplitude,
Digital signal processing means for adding the weighted signals; digital / analog conversion means for converting the signal added by the digital signal processing means into an analog signal; There is provided a second reception frequency conversion means for converting the frequency of the signal using a variable frequency local oscillator.

According to a fourth aspect of the present invention, in the directional antenna device according to the second or third aspect, the digital signal processing unit includes a phase and amplitude weighting coefficient calculated in advance by a combination of a desired wave direction and an unnecessary wave direction. Is provided, and the phase and amplitude weighting of each signal is performed using the phase and amplitude weighting coefficients of the reference table.

According to a fifth aspect of the present invention, there is provided a directional antenna device for controlling directivity using a plurality of antenna elements, wherein first frequency conversion means for converting the frequency of a signal received by each antenna element is provided. Weighting means for weighting the phase and amplitude of each signal converted by the first reception frequency conversion means, addition means for adding the signals weighted by this weighting means, and addition by this addition means. And a second receiving frequency converting means for converting the frequency of the converted signal using a frequency signal from an external transmission source.

According to a sixth aspect of the present invention, there is provided a directional antenna apparatus for controlling directivity using a plurality of antenna elements, wherein a first transmission frequency converting means for converting a frequency of a transmission signal using a frequency-variable local oscillator. And an in-phase distribution means for distributing the signal converted by the first transmission frequency conversion means in the same phase corresponding to each antenna element, and a phase and amplitude of each signal distributed by the in-phase distribution means. There is provided a weighting means for weighting, and a second transmission frequency conversion means for frequency-converting each signal weighted by the weighting means to a desired frequency and transmitting the signal to each antenna element.

According to a seventh aspect of the present invention, in a directional antenna apparatus for controlling directivity using a plurality of antenna elements, a first transmission frequency conversion means for converting a transmission signal using a frequency-variable local oscillator. And in-phase distribution means for distributing the signal converted by the first transmission frequency conversion means in the same phase corresponding to each antenna element, and converting each signal distributed by the in-phase distribution means into a digital signal. Analog / digital converting means for converting, digital signal processing means for taking in each digital signal converted by this converting means, weighting the phase and amplitude of each signal by digital processing, and each digital signal processed by this digital signal processing means Digital / analog conversion means for converting each signal into an analog signal, and each analog signal converted by this In that it comprises a and a second transmission frequency conversion means and transmits the frequency-converted to respective antenna elements to frequency.

According to the present invention, in a directional antenna apparatus for controlling directivity using a plurality of antenna elements, a first transmission frequency converting means for converting a frequency of a transmission signal using a frequency-variable local oscillator. Analog / digital conversion means for converting a signal converted by the first transmission frequency conversion means into a digital signal, and taking in the digital signal converted by the conversion means and performing digital processing corresponding to each antenna element. Digital signal processing means for distributing the signals in the same phase and weighting the phases and amplitudes of the distributed signals; and digital / analog converting means for converting the signals processed by the digital signal processing means into analog signals. Each analog signal converted by this conversion means is frequency-converted to a desired frequency and transmitted to each antenna element. In that a second transmission frequency conversion means that.

According to a ninth aspect of the present invention, in the directional antenna device according to the seventh or eighth aspect, the digital signal processing section includes a phase and amplitude weighting coefficient calculated in advance by a combination of a desired wave direction and an unnecessary wave direction. Is provided, and the phase and amplitude weighting of each signal is performed using the phase and amplitude weighting coefficients of the reference table.

According to a tenth aspect of the present invention, in a directional antenna device for controlling directivity using a plurality of antenna elements, a receiving unit, a transmitting unit, and a common antenna unit for the receiving unit and the transmitting unit. And a digital signal processing means for weighting the phase and amplitude of each signal by digital processing, and the receiving section converts the frequency of the signal received by each antenna element to a first signal.
And a first analog / digital converter that converts each signal converted by the first receiving frequency converter into a digital signal and supplies the digital signal to a digital signal processing unit.
Digital conversion means, first digital / analog conversion means for converting each signal processed by the digital signal processing means into an analog signal, addition means for adding each analog signal converted by this conversion means, Second reception frequency conversion means for converting the frequency of the signal added by the addition means using a frequency-variable local oscillator, wherein the transmission unit converts the frequency of the transmission signal using the frequency-variable local oscillator. 1 transmission frequency conversion means, in-phase distribution means for distributing the signal converted by the first transmission frequency conversion means in the same phase corresponding to each antenna element, and distributed by the in-phase distribution means. A second analog / digital conversion unit that converts each signal into a digital signal and supplies the digital signal to a digital signal processing unit; Second converting into respectively an analog signal
And a second transmission frequency conversion means for converting each analog signal converted by the conversion means into a desired frequency and transmitting the converted signal to each antenna element.

According to an eleventh aspect of the present invention, in a directional antenna apparatus for controlling directivity using a plurality of antenna elements, a receiving unit, a transmitting unit, and a common antenna unit for the receiving unit and the transmitting unit. After performing weighting on the phase and amplitude of each signal captured during reception by digital common processing and digital processing, addition of the weighted signals is performed, and the signal captured during transmission is transmitted to each antenna element. And a digital signal processing means for weighting the phase and amplitude of each of the divided signals after the distribution, and the receiving unit converts the frequency of the signal received by each antenna element into a first signal. And the respective signals converted by the first receiving frequency converter are converted into digital signals and supplied to the digital signal processing unit. A first analog / digital converter, a first digital / analog converter for converting the signal added by the digital signal processor into an analog signal, and a frequency-variable analog signal converted by the converter. A second receiving frequency converting unit for performing frequency conversion using a local oscillator; and a transmitting unit, wherein the first transmitting frequency converting unit for performing frequency conversion on a transmission signal using a frequency-variable local oscillator is provided. A second analog / digital conversion means for converting a signal converted by the first transmission frequency conversion means into a digital signal and supplying the digital signal to a digital signal processing unit, and converting each signal processed by the digital signal processing means into an analog signal Second digital / analog conversion means for converting the analog signals into analog signals, and converting each analog signal converted by the conversion means into a desired frequency. A second transmission frequency converting means for transmitting to each antenna element in the provision.

According to a twelfth aspect of the present invention, in the directional antenna apparatus according to the tenth or eleventh aspect, the digital signal processing unit includes a phase and amplitude weighting coefficient calculated in advance by a combination of a desired wave direction and an unnecessary wave direction. Is provided, and the phase and amplitude weighting of each signal is performed using the phase and amplitude weighting coefficients of the reference table.

The invention according to claim 13 is the invention according to claims 10 and 1
13. The directional antenna device according to 1 or 12, wherein the receiving unit converts the signal frequency-converted by the second reception frequency conversion unit into an optical signal and transmits the optical signal, and the first optical transmission unit. A first optical receiving unit that receives an optical signal from the optical transmitting unit, converts the received optical signal into an electric signal, and outputs the electric signal to the outside; and the transmitting unit converts the externally transmitted signal into an optical signal. Second optical transmission means for transmitting the
A transmission system interface including a second optical receiving unit that receives the optical signal from the second optical transmitting unit, converts the optical signal into an electric signal, and supplies the electric signal to the first transmitting frequency converting unit.

[0020]

Embodiments of the present invention will be described with reference to the drawings. First, a mode of use of the directional antenna device of the present invention will be described. As shown in FIG. 1, a directional antenna device 11 is connected to an existing wireless device 12 already installed in a base station or a terminal station for use. If you do, radio 1
2 antenna 121, for example, this radio 1
2 is connected to the input terminal of the IF (intermediate frequency) amplifier 122 of the receiving system. The radio device 12 originally amplifies the signal received by the antenna 121 with an RF (radio frequency) amplifier 123, converts the frequency with a frequency converter 124, amplifies the frequency with the IF amplifier 122, and further detects the signal with a detector ( DET)
At 125, the received data is detected by detection.

The directional antenna device 11 includes a radio 12
When the antenna receives a radio wave of a specific frequency band with each antenna element 13 of the adaptive array antenna, the frequency is lowered to perform optimal directivity control, and the frequency of the received signal is raised to the IF frequency (intermediate frequency) of the radio device 12. To be supplied to the IF amplifier 122. The directional antenna device 11 sets a weighting factor for each antenna element 13 so as to have a strong directivity in a desired wave direction and a weak directivity in an unnecessary wave such as a multipath or a microwave oven. Improve communication reliability.

Note that the directional antenna device 11 may be connected to an input terminal of a frequency converter 124 in a receiving system of the radio device 12. In this case, the frequency of the signal from the directional antenna device 11 is matched with the RF frequency (radio frequency) of the signal supplied from the RF amplifier 123 of the wireless device 12 to the frequency converter 124.

Although the reception system has been described here, in the case of the transmission system, for example, a transmission signal of an RF frequency is taken from the radio device 12 and the frequency of the transmission signal is lowered to in-phase the signal to each antenna element. After distribution, optimal directivity control is performed for each signal, and thereafter, the frequency of each signal is converted into a signal in a specific frequency band used by the radio device 12 and transmitted as a transmission signal from each antenna element 13. Will be.

(First Embodiment) In this embodiment, an example of a directional antenna device having only a receiving section will be described. As shown in FIG. 2, the directional antenna device 11 receives radio waves of a specific frequency band used by the existing wireless device 12 at each antenna element 13 of the adaptive array antenna. Each signal obtained by reception is amplified by a plurality of low-noise amplifiers (LNAs) 14, and the amplified signals are converted into low-frequency signals by a plurality of frequency converters 15, which are first receiving frequency converters. ing. A plurality of A / D converters 16 as analog / digital (hereinafter, referred to as A / D) converters convert the respective signals frequency-converted by the respective frequency converters 15 into digital signals, and convert the signals into digital signals. As a digital signal processing unit 17. The reason why each frequency converter 15 converts the reception frequency to a lower frequency by frequency conversion is that the digital signal processor 17
This is because the lower the frequency, the higher the sensitivity, selectivity, and stability when performing the processing.

The digital signal processing unit 17 is composed of a one-chip microcomputer, a general-purpose CPU, a DSP, and the like having excellent arithmetic functions. Is weighted in order to optimally control the digital signal and a plurality of digital / analog (hereinafter, referred to as D / A) conversion means.
These are supplied to the A converters 18 respectively.

The digital signal processing unit 17 includes, for example,
The phase and amplitude weighting coefficients stored in advance, the weighting coefficient determined by comparing the current reception signal with the immediately preceding reception signal, the reference signal of the desired wave as the current reception signal and the immediately preceding reception signal According to the weighting coefficient determined by comparing the received signals, arithmetic processing is performed on each input digital signal to weight the phase and the amplitude.

The D / A converters 18 convert the weighted digital signals from the digital signal processing unit 17 into analog signals and supply the analog signals to an adder 19. The adder 1
Numeral 9 adds each analog signal and supplies it to a frequency converter 20, which is a second receiving frequency converter. Thus, the analog signal from the adder 19 becomes a signal whose directivity is optimally controlled.

The frequency converter 20 has a local oscillator 20a whose frequency can be set variably.
An interface (hereinafter, referred to as an I / F) unit including a buffer or the like for setting the frequency of a and increasing the frequency of the input signal to the RF frequency of the existing wireless device 12 and matching this with the wireless device 12. 21 through the wireless device 12
Is supplied to the frequency converter 124 of FIG.

In such a configuration, when a plurality of antenna elements 13 receive radio waves in a specific frequency band used by the radio device 12, the respective received signals are converted into signals of lower frequencies by the frequency converter 15, respectively. Further, each of the A / D converters 16 converts the digital signal into a digital signal, and then performs arithmetic processing in the digital signal processing unit 17 to weight the amplitude and phase. After being converted into an analog signal by the A-converter 18 and added, an analog signal whose directivity is optimally controlled is obtained. Then, this analog signal is converted by the frequency converter 20 into R
After increasing the frequency to the F frequency, the frequency is supplied to the frequency converter 124 of the existing wireless device 12 via the I / F unit 21.

In the radio device 12, the directional antenna device 11
Is converted into an IF frequency signal by a frequency converter 124, amplified by an IF amplifier 122, and then detected by a detector 125 to obtain received data.

As described above, the antenna 121 of the existing radio device 12 is removed, and the directional antenna device 1
1 only needs to be connected to the input terminal of the frequency converter 124 of the wireless device 12, and the directional antenna device can be easily attached to the existing wireless device without changing the entire system of the wireless device. Moreover, since weighting of the received signal is performed by digital signal processing, stable amplitude and phase weighting can be performed, and the size of the apparatus can be reduced as compared with a case where weighting is performed in analog.

(Second Embodiment) In this embodiment, an example of a directional antenna device having only a receiving section will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 3, the digital processing means weights the amplitude and phase of each digitally converted received signal in order to optimally control directivity by digital signal processing. , A digital signal processing unit 171 for adding each signal. Then, the digital signal subjected to the addition processing from the digital signal processing unit 171 is converted into an analog signal by the D / A converter 181 and supplied to the frequency converter 20.

The frequency of the local oscillator 20a is set, the frequency of the signal input to the frequency converter 20 is increased to the IF frequency of the existing radio equipment 12, and this is transmitted to the radio equipment 12 via the I / F unit 21. It is supplied to the IF amplifier 122. In the radio device 12, the signal from the directional antenna device 11 is
The signal is amplified by the F amplifier 122 and then detected by the detector 125 to obtain received data. Other configurations are the same as those of the first embodiment.

In such a configuration, the antenna 121 of the existing radio 12 is removed, and the directional antenna device 11 is replaced with the IF amplifier 12 of the radio 12.
It is only necessary to connect to the second embodiment, and the same operation and effect as in the first embodiment can be obtained.

In the configuration of the first and second embodiments, the setting of the frequency of the local oscillator 20a provided in the frequency converter 20 of the directional antenna device 11 is varied, so that the reception of the known radio 12 The directional antenna device 11 can be connected to the IF section or the RF section of the system.

Further, in this embodiment, since the addition processing is also performed in the digital signal processing section 171, the number of D / A converters to be used can be reduced to one and the adder can be dispensed with. The device can be further miniaturized.

(Third Embodiment) In this embodiment, an example of a directional antenna device having only a receiving section will be described. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 4, a frequency signal from a local oscillator 124a of a frequency converter 124 of an existing radio device 12, which is an external transmission source, is used as a second reception frequency conversion means by an I / F unit 211. , And a frequency converter 201 for performing frequency conversion using this frequency signal is used. The signal frequency-converted by the frequency converter 201 is transmitted to the I / F
It is supplied to the F amplifier 122. Other configurations are the same as those of the above-described second embodiment.

The local oscillator 124a of the frequency converter 124 in the radio unit 12 is for producing a signal of the IF frequency, and the frequency converter of the directional antenna device 11 side is used by using the frequency signal from the local oscillator 124a. When the frequency conversion in 201 is performed, the signal after the frequency conversion is directly passed through the I / F section 211 to the IF amplifier 122 of the wireless device 12.
Can be entered.

With such a structure, the same operation and effect as those of the first embodiment can be obtained. Further, since the digital signal processing unit 171 that performs addition processing after weighting the amplitude and phase of the signal is used, the D / A to be used is similar to the second embodiment described above.
Since the number of converters can be reduced to one and an adder can be dispensed with, the size of the device can be further reduced. Further, the configuration of the frequency converter 201 itself is simplified.

(Fourth Embodiment) This embodiment also describes an example of a directional antenna device having only a receiving section. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 5, as a second receiving frequency converting means, an externally variable frequency local oscillator 2 is provided.
2, a frequency converter 201 which takes in a frequency signal from the local oscillator 22 via the I / F section 211 and performs frequency conversion using the frequency signal is used. The signal frequency-converted by the frequency converter 201 is transmitted to the I / F
It is supplied to the F amplifier 122. Other configurations are the same as those of the third embodiment.

In this embodiment, the frequency of the local oscillator 22 is set, the signal from the frequency converter 201 is raised to the IF frequency of the existing radio device 12, and the signal after the frequency conversion is
The signal is input to the IF amplifier 122 of the wireless device 12 via the / F unit 211.

With such a configuration, the same operation and effect as those of the first embodiment can be obtained. Further, since the digital signal processing unit 171 that performs addition processing after weighting the amplitude and phase of the signal is used, the D / A to be used is similar to the second embodiment described above.
Since the number of converters can be reduced to one and an adder can be dispensed with, the size of the device can be further reduced. Further, the configuration of the frequency converter 201 itself is simplified.

(Fifth Embodiment) This embodiment also describes an example of a directional antenna device having only a receiving section. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 6, as a digital processing means, a weighting coefficient for amplitude and phase is calculated in advance by a combination of a desired wave direction and an unnecessary wave direction by a pre-calculation processing unit 17a and stored in a reference table 17b. A digital signal processing unit for performing weighting of the amplitude and phase of each signal using the amplitude and phase weighting coefficients of the reference table 17b in order to optimally control the directivity by digital signal processing, and then adding each signal. 172 are provided. Then, the digital signal subjected to the addition processing from the digital signal processing unit 172 is converted into an analog signal by the D / A converter 181, frequency-converted by the frequency converter 20, and converted into an analog signal by the I / F unit 21. It is supplied to the frequency converter 124. Other configurations are the same as those of the above-described second embodiment.

With such a configuration, the same operation and effect as those of the first embodiment can be obtained. Since the digital signal processing unit 172 also performs the addition processing as in the second embodiment, the D / D
The number of A converters can be reduced to one, and an adder can be dispensed with, so that the device can be further downsized.

Also, since a reference table 17b is provided and each signal is subjected to amplitude and phase weighting processing using the amplitude and phase weighting coefficients of the reference table 17b, the weighting set by rewriting the contents of the reference table is performed. The coefficient can be easily changed. Therefore, if the radio wave propagation environment changes, the weighting coefficient of the reference table 17b may be changed accordingly, and a weighting process suitable for the radio wave propagation environment can be performed.

In this embodiment, a case has been described as an example where a reference table is provided in a digital signal processing unit that performs addition processing after weighting the amplitude and phase of each signal. However, the present invention is not necessarily limited to this. Instead, a reference table may be provided in a digital signal processing unit that only weights the amplitude and phase of each signal as in the first embodiment.

(Sixth Embodiment) In this embodiment, an example of a directional antenna device having only a transmitting section will be described. As shown in FIG. 7, transmission data is modulated by a modulator (MOD) 321 in an existing radio device 32,
The signal is amplified by an F amplifier 322 and converted to an RF frequency by a frequency converter 323 of a transmission system and supplied to the directional antenna device 31. In the existing wireless device 32, after the signal converted to the RF frequency by the frequency converter 323 is amplified by the RF amplifier 324, the antenna 3
Although the radio wave is transmitted from the radio wave 25, the antenna 325 is detached and used here.

The directional antenna device 31 is
The signal of the RF frequency from the second frequency converter 323 is I /
The signal is taken into a frequency converter 34 which is a first transmission frequency converter via an F unit 33. The frequency converter 34 includes a local oscillator 34 capable of variably setting a frequency.
a, a plurality of A / D converters for converting an input RF frequency signal into a post-stage in-phase distributor 35 and converting a plurality of signals distributed by the in-phase distributor 35 into the same phase into digital signals, respectively.
The converter 36 converts the signal to a low frequency that can be easily processed.

The signal whose frequency has been converted by the frequency converter 34 is distributed to a plurality of signals having the same phase by the in-phase distributor 35, and each of the signals is converted into a digital signal by a plurality of A / D converters 36. It is supplied to the digital signal processing unit 37. The digital signal processing unit 37 is composed of a one-chip microcomputer, a general-purpose CPU, a DSP, and the like having excellent arithmetic functions, and performs digital signal processing on digital signals from each A / D converter 36 individually to optimize directivity. In order to control, weighting of amplitude and phase is performed, and the weight is supplied to each of a plurality of D / A converters 38 as D / A conversion means. Thus, the plurality of weighted digital signals from the digital signal processing unit 37 are signals whose directivity is optimally controlled.

Each of the D / A converters 38 converts a digital signal into an analog signal, and supplies the analog signal to a plurality of frequency converters 39 which are second transmission frequency conversion means at the next stage. Each of the frequency converters 39 converts a frequency of an input signal into a signal of a specific frequency band used by the existing wireless device 32. Then, each of the frequency-converted signals is supplied to a plurality of power amplifiers (PA) 4.
After the respective powers are amplified by 0, each antenna element 41 transmits the signal as a transmission signal.

In such a configuration, the signal of the RF frequency from the frequency converter 323 of the existing radio 32 is transmitted to the I
The signal is taken into the frequency converter 34 via the / F section 33, converted into a signal of a low frequency, and supplied to the in-phase distributor 35. The in-phase distributor 35 distributes the input signal into a plurality of signals having the same phase,
Each of the distributed signals is converted into a digital signal by each A / D converter 36 and then supplied to a digital signal processing unit 37.

Each digital signal is subjected to arithmetic processing in the digital signal processing section 37 to perform weighting on the amplitude and phase, and each of the weighted digital signals is converted into each D / A signal.
The converter 38 converts the signal into an analog signal, and further converts the signal into a signal in a specific frequency band used by the wireless device 32 with each frequency converter 39. Each of the frequency-converted signals is power-amplified by each power amplifier 40, and then transmitted as a transmission signal from each antenna element 41.

As described above, the antenna 325 of the existing wireless device 32 is removed, and the directional antenna device 3
1 only needs to be connected to the output terminal of the frequency converter 323 of the radio 32, and the directional antenna device can be easily attached to an existing radio without changing the entire system of the radio. In addition, since weighting of the transmission signal is performed by digital signal processing, stable amplitude and phase weighting can be performed, and the size of the apparatus can be reduced as compared with the case where weighting is performed in analog.

(Seventh Embodiment) This embodiment will also describe an example of a directional antenna device having only a transmission unit. The same parts as those in the sixth embodiment are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 8, as digital processing means, digitally converted transmission signals are first subjected to in-phase distribution processing by digital signal processing, and then the directivity of each of the in-phase distributed signals is optimally controlled. For this purpose, a digital signal processing unit 371 for weighting the amplitude and the phase is provided.
Then, I from the IF amplifier 322 of the existing wireless device 32
The transmission signal of the F frequency is taken into the frequency converter 34 via the I / F unit 33, the frequency of the local oscillator 34a is set, and the frequency converter 34 converts the frequency to a low frequency that the A / D converter 361 can easily process. And the A / D converter 361
And converts the digital signal into a digital signal.
1 is supplied.

The digital signal processing section 371 distributes the digital signal in phase, and weights the amplitude and phase of each in-phase distributed signal in order to optimally control the directivity. The digital signal weighted by the digital signal processing unit 371 is converted into an analog signal by each D / A converter 38. Other configurations are the same as those of the above-described sixth embodiment.

In such a configuration, the antenna 325 of the existing radio 32 is removed, and the directional antenna device 31 is replaced with the IF amplifier 322 of the radio 32.
, And the same operation and effect as in the sixth embodiment described above can be obtained.

In the configurations of the sixth and seventh embodiments, the frequency setting of the local oscillator 34a provided in the frequency converter 34 of the directional antenna device 31 is varied, so that the transmission of the existing radio 32 can be performed. The directional antenna device 31 can be connected to the IF section or the RF section of the system.

Further, in this embodiment, since the digital signal processing section 371 also performs the in-phase distribution processing, the number of A / D converters to be used can be reduced to one, and the in-phase distributor is not required. The device can be further miniaturized.

(Eighth Embodiment) This embodiment also describes an example of a directional antenna device having only a transmission unit. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 9, as a digital processing means, a weighting coefficient of amplitude and phase is calculated in advance by a combination of a desired wave direction and an unnecessary wave direction by a pre-calculation processing unit 37a and stored in a reference table 37b. The digitally converted transmission signal is first subjected to in-phase distribution processing by digital signal processing, and then the amplitude and phase weighting coefficients of the reference table 37b are used to optimally control the directivity of each of the in-phase distributed signals. And a digital signal processing unit 372 for weighting the amplitude and the phase. Other configurations are the same as those of the seventh embodiment.

In such a configuration, the same operation and effect as in the sixth embodiment can be obtained. The A / D to be used is the same as in the above-described seventh embodiment.
The number of converters can be reduced to one, and the in-phase distributor can be dispensed with, so that the device can be further downsized.

Further, since a reference table 37b is provided and each signal is subjected to amplitude and phase weighting processing using the amplitude and phase weighting coefficients of the reference table 37b, the weights set by rewriting the contents of the reference table are set. The coefficient can be easily changed. Therefore, if the radio wave propagation environment changes, the weighting coefficient of the lookup table 37b may be changed accordingly, and a weighting process suitable for the radio wave propagation environment can be performed.

In this embodiment, a case has been described as an example where a transmission signal is distributed in phase and a reference table is provided in a digital signal processor for weighting the amplitude and phase of each signal distributed in phase. The present invention is not necessarily limited to this, and a reference table may be provided in a digital signal processing unit that performs only weighting of the amplitude and phase of each signal as in the sixth embodiment.

(Ninth Embodiment) In this embodiment, an example of a directional antenna device having both a receiving unit and a transmitting unit will be described. As shown in FIG.
2, the receiving system is provided with an RF amplifier 522, a frequency converter 523, an IF amplifier 524, and a detector (DET) 525 to extract received data from a received signal, and the transmitting system is a modulator (MOD) 526 and an IF amplifier 527. , Frequency converter 5
A transmission / reception radio for converting transmission data into a transmission signal is provided by using an RF amplifier 529 and an RF amplifier 529. An existing antenna 521 of the radio 52 is removed, and a directional antenna device 50 is connected instead.

The receiving section of the directional antenna device 50 receives radio waves of a specific frequency band used by the existing radio 52 with each antenna element 51 of the adaptive array antenna. Each signal obtained by reception is amplified by a plurality of low-noise amplifiers (LNAs) 54 via an antenna common unit 53, and is amplified by a plurality of frequency converters 55 as first frequency conversion means for reception. The signal is converted to a low frequency signal.

Each of the signals whose frequency has been converted by each of the frequency converters 55 is converted into a digital signal by a plurality of A / D converters 56 serving as first A / D conversion means, and the digital signal is used as digital signal processing means. It is supplied to the processing unit 57. Note that the reason why each of the frequency converters 55 converts the reception frequency to a lower frequency is that the digital signal processor 5
This is because, when the processing is performed in step 7, the lower the frequency, the higher the sensitivity, selectivity, and stability.

The digital signal processing unit 57 is composed of a one-chip microcomputer, a general-purpose CPU, a DSP, and the like having excellent arithmetic functions. The digital signal from each of the A / D converters 56 is individually subjected to digital signal processing. In order to optimally control the directivity, the amplitude and the phase are weighted, and then the weighted signals are added. Then, the added signal is supplied to a D / A converter 58 which is a first D / A converter.

The digital signal processing unit 57 includes, for example,
A phase and amplitude weighting coefficient stored in advance, a weighting coefficient determined by comparing the immediately preceding output with the received signal by digital signal processing, or comparing the immediately preceding output with the reference signal of the desired wave According to the determined weighting coefficient, arithmetic processing is performed on each input digital signal, and phase and amplitude weighting is performed.

The D / A converter 58 converts the digital signal of which the directivity is optimally controlled from the digital signal processing unit 57 into an analog signal, and supplies the analog signal to a frequency converter 59 which is a second receiving frequency converter. are doing. The frequency converter 59 includes a local oscillator 59a capable of variably setting the frequency. The frequency of an input signal is increased to the RF frequency of the existing radio 52, and the I / F for matching this with the radio 52 is used.
The signal is supplied to the frequency converter 523 of the wireless device 52 through the unit 60. The wireless device 52 converts a signal received from the directional antenna device 50 into a frequency converter 523
Is converted into an IF frequency, which is detected by a detector 525 to extract transmission data.

The transmitting section of the directional antenna device 50 modulates the transmission data in the existing radio 52 by the modulator 526, amplifies it by the IF amplifier 527, and amplifies it by the frequency converter
The frequency converter 61 converts the RF frequency at 28 into a frequency converter 61 serving as a first transmission frequency converter via an I / F unit 60.
To take in. The frequency converter 61 includes:
A local oscillator 61a capable of variably setting a frequency is provided, and converts an input RF frequency signal into a frequency low enough to be processed by an A / D converter 62, which is a second A / D conversion means at the subsequent stage. I have.

The signal whose frequency has been converted by the frequency converter 61 is converted into a digital signal by the A / D converter 62 and supplied to the digital signal processing section 57. The digital signal processing unit 57 first subjects the digital signal from the A / D converter 62 to in-phase distribution processing, and then weights the amplitude and phase for each of the in-phase distributed signals in order to optimally control the directivity. And a plurality of D / A converters,
The signals are supplied to the A converters 63, respectively. Thus, the plurality of weighted digital signals from the digital signal processing unit 57 are signals whose directivity is optimally controlled.

Each of the D / A converters 63 converts a digital signal into an analog signal, and supplies the analog signal to a plurality of frequency converters 64 which are second transmission frequency conversion means at the next stage. Each of the frequency converters 64 converts a frequency of an input signal into a signal of a specific frequency band used by the existing wireless device 52. Each of the frequency-converted signals is power-amplified by a plurality of power amplifiers 65, and then transmitted as a transmission signal from each of the antenna elements 51 via the antenna sharing unit 53.

In such a configuration, when a plurality of antenna elements 51 receive a radio wave of a specific frequency band used by the radio device 52, each received signal is converted by the frequency converter 55 into a signal of a lower frequency. Further, the digital signals are converted into digital signals by the respective A / D converters 56, and the digital signal processing unit 57 performs arithmetic processing to weight the amplitude and phase, and further performs addition processing to optimally control the directivity. The digital signal thus output is output to the D / A converter 58. After the digital signal is converted to an analog signal by the D / A converter 58, the frequency of the analog signal is increased to the RF frequency by the frequency converter 59, and then the frequency converter 523 of the existing wireless device 52 is transmitted via the I / F unit 60. To supply.

In the wireless device 52, the directional antenna device 50
Is converted to an IF frequency signal by a frequency converter 523, amplified by an IF amplifier 524, and then detected by a detector 525 to obtain received data.

When transmitting the transmission data, the transmission signal in the existing radio 52 is modulated by the modulator 526, amplified by the IF amplifier 527, and frequency-converted by the frequency converter 528 to the I / F section. The signal is taken into the frequency modulator 61 via 60 and is converted into a signal of a low frequency. Then, the frequency-converted transmission signal is converted into a digital signal by the A / D converter 62 and then supplied to the digital signal processing unit 57.

The digital signal processor 57 first divides the digital signal into a plurality of signals having the same phase, and weights the amplitude and phase of each signal. Each digital signal weighted by the digital signal processing unit 57 is converted into an analog signal by the D / A converter 63, and further converted into a signal of a specific frequency band used by the wireless device 52 by each frequency converter 64. . Then, after each of the frequency-converted signals is power-amplified by each power amplifier 65, the antenna common unit
Is transmitted as a transmission signal from each antenna element 51 via the.

As described above, with respect to the existing radio 52,
The antenna 521 is removed, and the receiving unit of the directional antenna device 50 is replaced with the frequency converter 5 of the radio 52.
23 and an output terminal of the frequency converter 528 of the radio 52, and the directional antenna device 50 can be connected to an existing radio without changing the entire system of the radio. Can be easily installed on Moreover, since the weighting of the reception signal and the transmission signal is performed by digital signal processing, stable amplitude and phase weighting can be performed, and the size of the apparatus can be reduced as compared with the case where the weighting is performed in analog.

(Tenth Embodiment) This embodiment also describes an example of a directional antenna device having both a receiving unit and a transmitting unit. The same parts as those in the ninth embodiment are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 11, as a digital processing means, a weighting coefficient of amplitude and phase is calculated in advance by a combination of a desired wave direction and an unnecessary wave direction by a pre-calculation processing unit 57a and stored in a reference table 57b. For each received signal digitally converted by each A / D converter 56, first, in order to optimally control directivity, weighting of amplitude and phase is performed using the weighting coefficient of amplitude and phase of the reference table 57b. Subsequently, the weighted signals are added and output to the D / A converter 58, and the transmission signal that has been digitally converted by the A / D converter 62 is first subjected to in-phase distribution processing. In order to optimally control the directivity of the signals distributed in phase, the amplitude and phase are weighted using the amplitude and phase weighting coefficients of the reference table 57b, and each D / A converter 6 Digital signal processing unit 57 to be output to the
1 is provided. Other configurations are the same as those of the ninth embodiment.

The processing of the digital signal processing unit 571 will be described in detail. As shown in FIG. 12, first, in step S1, the directions of a desired wave and an unnecessary wave are determined, and then in step S2, The pre-calculation processing unit 57a calculates the combination of the desired wave direction and the unnecessary wave direction, and refers to the amplitude and phase weighting coefficients stored in the reference table 57b. Then, in step S3, an amplitude weighting factor is set, in step S4, a phase weighting factor is set, and in step S5, the process waits until there is a data transmission request or a data reception request.

In this state, if there is a data transmission request or a data reception request, the desired wave direction and the unnecessary wave direction are confirmed again in step S6, and if there is a change, the processes in steps S1 to S4 are performed again. Then, the amplitude and phase weight coefficients are set with reference to the new amplitude and phase weight coefficients from the reference table 57b. If there is no change, transmission or reception of data is started. If the request is data reception, a data reception process is performed in step S7, and if the request is data transmission, a data transmission process is performed in step S8.

The data receiving process is as shown in FIG.
First, in step S11, received signals received by the plurality of antenna elements 51 are input as digital signals from the respective A / D converters 56. Then, in steps S12 and S13, the amplitude and phase are weighted using the amplitude and phase weighting coefficients of the reference table 57b. Subsequently, in step S14, the weighted digital signals are added,
The resulting digital signal is output to D / A converter 58.

The data transmitting means, as shown in FIG.
First, in step S21, a digital signal of a transmission signal is input from the A / D converter 62. Then, step S2
At 2, the input digital signal is in-phase distributed to a plurality of antenna elements. Subsequently, steps S23 and S24
The reference table 57 is assigned to each digital signal distributed in-phase.
The amplitude and phase are weighted using the amplitude and phase weighting coefficients of b, and the resulting digital signals are output to the D / A converter 63 in step S25.

With such a configuration, the same operation and effect as those of the ninth embodiment can be obtained. Further, since the reference table 57b is provided and each signal is subjected to the amplitude and phase weighting processing using the amplitude and phase weighting coefficients of the reference table 57b, the weighting coefficient set by rewriting the contents of the reference table is changed. Therefore, if the radio wave propagation environment changes, the weighting coefficient of the reference table 57b may be changed accordingly, and a weighting process suitable for the radio wave propagation environment can be performed.

In this embodiment, at the time of reception, weighting of the amplitude and phase of each signal is performed and then addition processing is performed.
At the time of transmission, the case where a reference table is provided in the digital signal processing unit that weights the amplitude and phase of each signal after distributing the signals in phase has been described as an example, but it is not necessarily limited to this, and at the time of reception and transmission A reference table may be provided in a digital signal processing unit that performs only weighting on the amplitude and phase of each signal. In this case, it is necessary to separately provide an adder and an in-phase distributor.

In the above-described ninth and tenth embodiments, the interface unit electrically connected by a line is used as the interface unit for obtaining compatibility between the directional antenna device 50 and the existing radio 52. The invention is not necessarily limited to this, and an interface unit for performing optical communication may be used as shown in FIG.

That is, the directional antenna device 50 has the first
The optical transceiver 71 is connected to the existing wireless device 52 and the second
Are connected. The first optical transmission / reception device 71 includes a first electrical / optical (E / O) converter 7 as a receiving system.
2 and a first having a light emitting element such as an infrared light emitting diode
And a transmission system is constituted by a first light receiver 74 having a light receiving element such as a PIN photodiode and a first optical / electrical (O / E) converter 75. The second
The optical transmission / reception device 81 includes a receiving system including a second light receiving device 82 having a light receiving element such as a PIN photodiode and a second optical / electrical (O / E) converter 83, and a transmitting system including a second optical / electrical (O / E) converter 83. And a second light emitting device 85 having a light emitting element such as an infrared light emitting diode.

In such a configuration, the received signal received by the directional antenna device 50 is
After being converted into an optical signal by the first first electrical / optical converter 72,
Optical communication is performed from the first light emitter 73 to the second light receiver 82 of the second optical transceiver 81. The optical signal received by the second light receiver 82 is returned to the original received signal by the second optical / electrical converter 83 and supplied to the wireless device 52.

After the transmission signal from the wireless device 52 is converted into an optical signal by the second electric / optical converter 84 of the second optical transmission / reception device 81, the first optical transmission / reception device 85 transmits the first optical transmission / reception signal. Optical communication is performed with the first light receiver 74 of the device 71. First
The optical signal received by the optical receiver 74 is returned to the original transmission signal by the first optical / electrical converter 75 and supplied to the directional antenna device 50.

By using the interface having such a configuration, the directional antenna device 50 and the radio 52
Can be installed at a considerable distance. In this case, it is necessary to arrange each of the optical transmission / reception devices 71 and 81 so that the light is not blocked by an obstacle. For example, when the optical transmission / reception devices 71 and 81 are used in an indoor wireless communication system, they are preferably arranged on a ceiling or the like. Further, since no wiring is required between the directional antenna device 50 and the wireless device 52, the installation position can be freely changed as long as the optical transmission / reception devices 71 and 81 are installed at positions where they can be seen from each other. You can have.

[0096]

According to the inventions described in the claims, it is possible to easily mount an existing wireless device which does not employ an adaptive array antenna without changing the entire system of the wireless device. According to the second to fourth and seventh to twelfth aspects of the present invention, more stable weighting of amplitude and phase can be performed, and furthermore, the size of the apparatus can be reduced.

According to the fourth, ninth, and twelfth aspects of the present invention, the weighting coefficient set in advance can be easily rewritten, and a weighting process suitable for a radio wave propagation environment can be performed. According to the thirteenth aspect of the present invention, the interface with the outside is optically communicated, so that the installation position can be freely changed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a usage pattern of a directional antenna device according to the present invention.

FIG. 2 is a block diagram showing a first embodiment of the present invention.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram showing a third embodiment of the present invention.

FIG. 5 is a block diagram showing a fourth embodiment of the present invention.

FIG. 6 is a block diagram showing a fifth embodiment of the present invention.

FIG. 7 is a block diagram showing a sixth embodiment of the present invention.

FIG. 8 is a block diagram showing a seventh embodiment of the present invention.

FIG. 9 is a block diagram showing an eighth embodiment of the present invention.

FIG. 10 is a block diagram showing a ninth embodiment of the present invention.

FIG. 11 is a block diagram showing a tenth embodiment of the present invention.

FIG. 12 is a flowchart showing processing of a digital signal processing unit in the embodiment.

FIG. 13 is a flowchart specifically showing a data reception process in FIG. 12;

FIG. 14 is a flowchart specifically showing a data transmission process in FIG. 12;

FIG. 15 is a diagram showing another embodiment of a transmission / reception interface between a directional antenna device and an existing wireless device.

FIG. 16 is a block diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Directivity antenna apparatus 12 ... Existing radio equipment 13 ... Antenna element of an adaptive array antenna 15, 20 ... Frequency converter 17 ... Digital signal processing part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 7/22 H04Q 7/04 A 7/24 H04B 9/00 R 7/26 7/30 // H04B 10 / 105 10/10 10/22 (72) Inventor Hiroki Mochizuki 6-78, Minamimachi, Mishima-shi, Shizuoka F-term in Toshiba Tec Corporation Technical Research Laboratory 5J021 AA05 AA06 CA06 DB02 DB03 EA04 FA14 FA16 FA17 FA20 FA24 FA26 FA29 FA30 FA32 GA02 GA08 HA05 5K002 AA05 FA03 GA07 5K059 CC02 CC04 DD35 EE02 5K067 AA42 EE10 EE37 HH21 KK02 KK03

Claims (13)

[Claims] 1. A directional antenna device for controlling directivity using a plurality of antenna elements, comprising: a first reception frequency conversion unit for converting a frequency of a signal received by each of the antenna elements; Weighting means for weighting the phase and amplitude of each signal converted by the reception frequency conversion means, addition means for adding each signal weighted by this weighting means, and frequency-variable signals added by this addition means A second receiving frequency converting means for performing frequency conversion using the local oscillator of (1). 2. A directional antenna device for controlling directivity using a plurality of antenna elements, comprising: first reception frequency conversion means for converting the frequency of a signal received by each of the antenna elements; Analog / digital conversion means for converting each signal converted by the reception frequency conversion means into a digital signal, and taking in each digital signal converted by this conversion means, weighting the phase and amplitude of each signal by digital processing. Digital signal processing means, digital / analog conversion means for converting each signal processed by the digital signal processing means into an analog signal, addition means for adding each analog signal converted by the conversion means, Means for frequency-converting the signal added by the means using a frequency-variable local oscillator. Directional antenna apparatus characterized by comprising and. 3. A directional antenna device for controlling directivity using a plurality of antenna elements, wherein: a first reception frequency conversion means for converting a frequency of a signal received by each of the antenna elements; Analog / digital conversion means for converting each signal converted by the reception frequency conversion means into a digital signal, and taking in each digital signal converted by this conversion means, weighting the phase and amplitude of each signal by digital processing. ,
Digital signal processing means for adding the weighted signals; digital / analog conversion means for converting the signal added by the digital signal processing means into an analog signal; A directional antenna device comprising: a second reception frequency conversion unit that converts a frequency of a signal using a frequency-variable local oscillator. 4. A digital signal processing unit comprising a reference table storing phase and amplitude weighting coefficients calculated in advance by a combination of a desired wave direction and an unnecessary wave direction, and using the phase and amplitude weighting coefficients of the reference table. 4. The directional antenna device according to claim 2, wherein the weighting of the phase and the amplitude of each signal is performed using the signal. 5. A directional antenna device for controlling directivity using a plurality of antenna elements, wherein: a first reception frequency conversion unit for converting a frequency of a signal received by each of the antenna elements; Weighting means for weighting the phase and amplitude of each signal converted by the reception frequency conversion means, addition means for adding each signal weighted by this weighting means, and externally adding the signal added by this addition means A directional antenna device comprising: a second reception frequency conversion unit that performs frequency conversion using a frequency signal from a transmission source. 6. A directional antenna device for controlling directivity using a plurality of antenna elements, wherein: a first transmission frequency conversion means for converting a transmission signal into a frequency using a frequency-variable local oscillator; In-phase distribution means for distributing the signal converted by the transmission frequency conversion means in the same phase corresponding to each of the antenna elements, and weighting means for weighting the phase and amplitude of each signal distributed by the in-phase distribution means And a second transmission frequency conversion means for frequency-converting each signal weighted by the weighting means to a desired frequency and transmitting the converted signal to each antenna element. 7. A directional antenna device for controlling directivity using a plurality of antenna elements, wherein: a first transmission frequency conversion means for converting a transmission signal using a frequency-variable local oscillator; In-phase distribution means for distributing the signal converted by the transmission frequency conversion means in the same phase corresponding to each of the antenna elements, and analog / digital for converting each signal distributed by the in-phase distribution means into a digital signal. Conversion means, digital signal processing means for taking in each digital signal converted by this conversion means and weighting the phase and amplitude of each signal by digital processing, and converting each signal processed by this digital signal processing means into an analog signal Digital / analog converting means for converting each analog signal into a desired frequency. Directional antenna device converting to is characterized in that a second transmission frequency conversion means for transmitting said each antenna element. 8. A directional antenna device for controlling directivity using a plurality of antenna elements, wherein: a first transmission frequency conversion means for converting a transmission signal using a frequency-variable local oscillator; Analog / digital conversion means for converting the signal converted by the transmission frequency conversion means into a digital signal; taking in the digital signal converted by this conversion means and distributing it in the same phase corresponding to each antenna element by digital processing; Digital signal processing means for weighting the phase and amplitude of each of the distributed signals; digital / analog conversion means for converting each signal processed by the digital signal processing means into an analog signal; A second transmission for converting the analog signals obtained by the frequency conversion to desired frequencies and transmitting the converted signals to the antenna elements, respectively. Directional antenna device being characterized in that a use frequency converting means. 9. The digital signal processing unit includes a reference table in which phase and amplitude weighting coefficients calculated in advance by a combination of a desired wave direction and an unnecessary wave direction are stored, and the phase and amplitude weighting coefficients of the reference table are stored. 9. The directional antenna device according to claim 7, wherein the phase and amplitude of each signal are weighted using the directional antenna. 10. A directional antenna device for controlling directivity using a plurality of antenna elements, comprising: a receiving unit, a transmitting unit, and an antenna sharing unit for sharing the antenna elements with the receiving unit and the transmitting unit; Digital signal processing means for weighting the phase and amplitude of each signal by digital processing, the receiving unit, the first receiving frequency conversion means for converting the frequency of the signal received by each antenna element, respectively, A first analog / digital conversion unit that converts each signal converted by the first reception frequency conversion unit into a digital signal and supplies the digital signal to the digital signal processing unit; First digital / analog converting means for converting each signal into an analog signal, and converting each analog signal converted by this converting means. And a second reception frequency conversion unit that converts the frequency of the signal added by the addition unit using a frequency-variable local oscillator, wherein the transmission unit converts the transmission signal into a frequency-variable local unit. First transmission frequency conversion means for performing frequency conversion using an oscillator, and in-phase distribution means for distributing a signal converted by the first transmission frequency conversion means to the same phase corresponding to each of the antenna elements; A second analog / digital conversion unit that converts each signal distributed by the in-phase distribution unit into a digital signal and supplies the digital signal to the digital signal processing unit; and converts each signal processed by the digital signal processing unit into a digital signal. Second digital / analog converting means for converting the analog signals into analog signals, and converting each analog signal converted by the converting means into a desired frequency. Directional antenna apparatus characterized in that a second transmission frequency converting means for sending to the antenna element. 11. A directional antenna device for controlling directivity using a plurality of antenna elements, comprising: a receiving unit, a transmitting unit, and an antenna sharing unit for sharing the antenna elements with the receiving unit and the transmitting unit; After performing weighting of the phase and amplitude of each signal captured at the time of reception by digital processing, addition of each signal subjected to this weighting is performed, and at the time of transmission, the captured signal corresponds to each of the antenna elements. Digital signal processing means for weighting the phase and amplitude of each of the distributed signals after distributing the signals in the same phase, wherein the receiving unit converts the frequency of the signal received by each of the antenna elements to a first reception signal Frequency converting means, and each signal converted by the first receiving frequency converting means is converted into a digital signal and supplied to the digital signal processing unit. First analog / digital conversion means, first digital / analog conversion means for converting the signal added by the digital signal processing means into an analog signal, and frequency conversion of the analog signal converted by the conversion means. A second reception frequency conversion means for performing frequency conversion using a local oscillator of the first transmission frequency conversion means for performing a frequency conversion of the transmission signal using a frequency-variable local oscillator, A second analog / digital conversion unit that converts the signal converted by the first transmission frequency conversion unit into a digital signal and supplies the digital signal to the digital signal processing unit; and each signal processed by the digital signal processing unit. Digital / analog converting means for converting each analog signal into an analog signal, and converting each analog signal converted by the converting means into a desired frequency. Directional antenna apparatus characterized in that a second transmission frequency converting means for frequency conversion and transmits the to each antenna element. 12. The digital signal processing unit includes a reference table in which phase and amplitude weighting coefficients calculated in advance by a combination of a desired wave direction and an unnecessary wave direction are stored, and the phase and amplitude weighting coefficients of the reference table are stored. 12. The directional antenna device according to claim 10, wherein weighting of phase and amplitude of each signal is performed by using the signal. 13. A receiving section comprising: a first optical transmitting section for converting a signal frequency-converted by the second receiving frequency converting section into an optical signal and transmitting the optical signal; and an optical signal from the first optical transmitting section. A first optical receiving means for receiving a signal, converting the signal into an electric signal, and outputting the signal to the outside; and a transmitting unit for converting a transmission signal from the outside into an optical signal and transmitting the signal. A transmission system interface comprising: an optical transmission unit; and a second optical reception unit that receives the optical signal from the second optical transmission unit, converts the received optical signal into an electric signal, and supplies the electric signal to the first transmission frequency conversion unit. Claim 10, characterized in that:
13. The directional antenna device according to 11 or 12.