JPH0548491A - Wireless transmission system - Google Patents
Wireless transmission systemInfo
- Publication number
- JPH0548491A JPH0548491A JP20036191A JP20036191A JPH0548491A JP H0548491 A JPH0548491 A JP H0548491A JP 20036191 A JP20036191 A JP 20036191A JP 20036191 A JP20036191 A JP 20036191A JP H0548491 A JPH0548491 A JP H0548491A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- transmission
- reception
- local oscillation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複数の端末器間でデー
タや音声などの信号をワイヤレスで送受信するワイヤレ
ス伝送方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless transmission system for wirelessly transmitting and receiving signals such as data and voice between a plurality of terminals.
【０００２】[0002]
【従来の技術】従来のワイヤレス伝送方式に用いる送信
回路と受信回路の構成を図５と図６にそれぞれ示す。ま
ず、送信回路１では、中間周波信号を周波数変換回路１
１に入力し、局部発振器１２からの局部発振周波信号と
混合して高周波の送受信周波信号に変換し、必要な周波
数の信号を増幅回路１３により増幅して、出力回路１４
を介してアンテナ１５から送信する。次に、受信回路２
では、アンテナ２５から入力回路２４を介して受信した
受信信号のうち、必要な周波数の信号を増幅回路２３に
より増幅し、局部発振器２２からの局部発振信号と混合
して、周波数変換回路２１により中間周波信号に変換し
て出力する。なお、出力回路１４および入力回路２４で
は、インピーダンスの整合や平衡／不平衡の変換などを
行うものである。2. Description of the Related Art Configurations of a transmission circuit and a reception circuit used in a conventional wireless transmission system are shown in FIGS. 5 and 6, respectively. First, in the transmission circuit 1, the intermediate frequency signal is converted into the frequency conversion circuit 1
1 and mixes it with the local oscillation frequency signal from the local oscillator 12 to convert it into a high frequency transmission / reception frequency signal, amplifies the signal of the required frequency by the amplifier circuit 13,
It transmits from the antenna 15 via. Next, the receiving circuit 2
Then, of the reception signals received from the antenna 25 via the input circuit 24, a signal of a necessary frequency is amplified by the amplification circuit 23, mixed with the local oscillation signal from the local oscillator 22, and then intermediated by the frequency conversion circuit 21. Converted to a frequency signal and output. The output circuit 14 and the input circuit 24 perform impedance matching and balanced / unbalanced conversion.
【０００３】[0003]
【発明が解決しようとする課題】上述のように、従来の
ワイヤレス伝送方式では、データや音声などの信号をワ
イヤレスで送受信する複数の端末器の各々が送信回路１
と受信回路２を備え、これらが局部発振器１２及び２２
を備えているために、局部発振周波数が高くなると、局
部発振器１２，２２が高価になり、各端末器に接続する
送受信回路のコストが上昇するという問題があった。As described above, in the conventional wireless transmission system, each of the plurality of terminals for wirelessly transmitting and receiving signals such as data and voice has the transmitting circuit 1.
And a receiving circuit 2, which are local oscillators 12 and 22.
Therefore, when the local oscillation frequency becomes high, the local oscillators 12 and 22 become expensive, and the cost of the transmission / reception circuit connected to each terminal increases.
【０００４】本発明は、このような点に鑑みてなされた
ものであり、その目的とするところは、局部発振周波数
が高い場合でも端末器の送受信回路を安価に構成できる
ようなワイヤレス伝送方式を提供することにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless transmission system capable of inexpensively constructing a transmission / reception circuit of a terminal even when a local oscillation frequency is high. To provide.
【０００５】[0005]
【課題を解決するための手段】本発明のワイヤレス伝送
方式にあっては、上記の課題を解決するために、複数の
端末器間で信号をワイヤレスで送受信する系において、
局部発振周波数の基準信号を送出する送信回路を特定の
端末器に備え、他の端末器は、前記基準信号を受信し、
受信した基準信号に基づいて、送受信周波信号と中間周
波信号との周波数変換用の局部発振周波信号を作成する
送受信回路を備えることを特徴とするものである。According to the wireless transmission system of the present invention, in order to solve the above-mentioned problems, in a system for wirelessly transmitting and receiving a signal between a plurality of terminals,
A specific terminal device is provided with a transmission circuit that transmits a reference signal of a local oscillation frequency, and another terminal device receives the reference signal,
A transmission / reception circuit for producing a local oscillation frequency signal for frequency conversion between the transmission / reception frequency signal and the intermediate frequency signal based on the received reference signal.
【０００６】また、特定の端末器は、複数の周波数の基
準信号を送出する送信回路を備え、他の端末器は、端末
器毎又は端末器のグループ毎に異なる周波数の基準信号
を利用して局部発振周波信号を作成する送受信回路を備
えることが好ましい。Further, a specific terminal device is provided with a transmission circuit for transmitting reference signals of a plurality of frequencies, and other terminal devices use reference signals of different frequencies for each terminal device or each group of terminals. It is preferable to include a transmission / reception circuit for generating a local oscillation frequency signal.
【０００７】[0007]
【作用】本発明のワイヤレス伝送方式では、複数の端末
器間でデータや音声などの信号をワイヤレスで送受信す
る系において、その中の特定の端末器の送信回路のみが
局部発振器を備えていれば良いので、その他の端末器の
送受信回路の局部発振器は不要となり、送受信回路が安
価に構成できる。また、複数の基準信号を、端末器毎又
は端末器のグループ毎に割り当てることによって、送受
信信号の管理が容易となる。In the wireless transmission system of the present invention, in a system for wirelessly transmitting and receiving signals such as data and voice between a plurality of terminals, if only the transmission circuit of a specific terminal among them has a local oscillator. Since it is good, the local oscillator of the transmission / reception circuit of the other terminals is unnecessary, and the transmission / reception circuit can be constructed at low cost. Also, by allocating a plurality of reference signals to each terminal device or each group of terminal devices, transmission / reception signal management becomes easy.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図面を用いて説明
する。図１は本発明の一実施例によるワイヤレス伝送方
式に用いる特定の端末器の送信回路１のブロック図であ
り、図２は他の端末器における受信回路２のブロック図
である。特定の端末器の送信回路１では、中間周波信号
を周波数変換回路１１に入力し、局部発振器１２からの
局部発振信号と混合して送受信周波信号に変換する。ま
た、局部発振周波数の基準信号を増幅回路１６により増
幅し、混合回路１７により送受信周波信号と混合して、
出力回路１４を経て、アンテナ１５から同時に送信す
る。一方、他の端末器の受信回路２では、アンテナ２５
から受信した信号を、入力回路２４を経て、第１のフィ
ルタ２６と第２のフィルタ２７により基準信号と受信信
号とに分離し、基準信号を増幅回路２８により増幅して
局部発振周波信号を作成し、増幅回路２３により増幅し
た受信信号と共に周波数変換回路２１に入力し、両信号
を混合して中間周波信号に変換し、出力する。また、他
の端末器の送信回路でも図２に示した受信回路２と同様
に、特定の端末器の送信回路１が送出した基準信号から
局部発振周波信号を作成し、これを中間周波信号と混合
して送受信周波信号に変換して送信する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a transmission circuit 1 of a specific terminal used in a wireless transmission system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a reception circuit 2 of another terminal. In the transmission circuit 1 of the specific terminal device, the intermediate frequency signal is input to the frequency conversion circuit 11, mixed with the local oscillation signal from the local oscillator 12, and converted into a transmission / reception frequency signal. Further, the reference signal of the local oscillation frequency is amplified by the amplification circuit 16, and mixed with the transmission / reception frequency signal by the mixing circuit 17,
The signals are simultaneously transmitted from the antenna 15 via the output circuit 14. On the other hand, in the receiving circuit 2 of another terminal device, the antenna 25
The signal received from the input circuit 24 is separated into a reference signal and a received signal by the first filter 26 and the second filter 27, and the reference signal is amplified by the amplifier circuit 28 to create a local oscillation frequency signal. Then, the signal is input to the frequency conversion circuit 21 together with the received signal amplified by the amplifier circuit 23, both signals are mixed, converted into an intermediate frequency signal, and output. Similarly to the receiving circuit 2 shown in FIG. 2, the transmitting circuit of another terminal device creates a local oscillation frequency signal from the reference signal transmitted by the transmitting circuit 1 of the specific terminal device, and uses this as an intermediate frequency signal. The signals are mixed and converted into a transmission / reception frequency signal and transmitted.
【０００９】図３は本発明の他の実施例に用いる送信回
路１のブロック図である。この回路では、局部発振器１
２がｆ０からｆｎの複数の周波数の基準信号を送出して
いる。図４は本実施例の全体構成を示している。図３に
示す送信回路１を備える特定の端末器Ｔｓは、他の一般
の端末器Ｔ０，Ｔ１，…，Ｔｎに対して、ｆ０からｆｎ
の複数の周波数の基準信号を送出する。各端末器Ｔ０，
Ｔ１，…，Ｔｎでは、これらの基準信号を利用して局部
発振周波信号を作成し、作成した局部発振周波信号を使
用して送受信周波信号と中間周波信号との変換を行う。
基準信号の周波数ｆ０，ｆ１，ｆ２，…，ｆｎの割り当
ては、端末器毎又は端末器のグループ毎に割り当てられ
る。FIG. 3 is a block diagram of a transmission circuit 1 used in another embodiment of the present invention. In this circuit, the local oscillator 1
2 transmits reference signals of a plurality of frequencies f0 to fn. FIG. 4 shows the overall configuration of this embodiment. The specific terminal device Ts including the transmission circuit 1 shown in FIG. 3 is different from other general terminal devices T0, T1, ..., Tn in f0 to fn.
The reference signals of a plurality of frequencies are transmitted. Each terminal T0,
At T1, ..., Tn, a local oscillation frequency signal is created by using these reference signals, and a transmission / reception frequency signal and an intermediate frequency signal are converted using the created local oscillation frequency signal.
The frequencies f0, f1, f2, ..., Fn of the reference signals are assigned to each terminal or each group of terminals.
【００１０】[0010]
【発明の効果】請求項１記載の発明によれば、上述のよ
うに、特定の端末器の送信回路から送出された基準信号
を用いて一般の端末器の送受信回路の局部発振周波信号
を作成するので、一般の端末器の送受信回路に局部発振
器が不要になり、送受信回路を安価に構成できるという
効果がある。さらに、従来のように各端末器の送受信回
路がそれぞれ独立した局部発振器を備える場合には、各
局部発振器の周波数変動が問題となるのに対して、本発
明では、局部発振周波数を全ての端末器の送受信回路で
共用することによって、中間周波数及び送受信周波数が
安定し、且つ同期も採り易くなるという効果がある。According to the invention described in claim 1, as described above, the local oscillation frequency signal of the transmission / reception circuit of a general terminal is created using the reference signal transmitted from the transmission circuit of a specific terminal. Therefore, there is an effect that a local oscillator is not required in the transmission / reception circuit of a general terminal device, and the transmission / reception circuit can be configured at low cost. Further, when the transmitter / receiver circuit of each terminal device is provided with an independent local oscillator as in the conventional case, the frequency fluctuation of each local oscillator becomes a problem, whereas in the present invention, the local oscillation frequency is set in all terminals. By sharing the same between the transmitter / receiver circuit of the device, the intermediate frequency and the transmitter / receiver frequency can be stabilized, and synchronization can be easily obtained.
【００１１】また、請求項２記載の発明によれば、基準
信号の周波数を複数とし、端末器毎又は端末器のグルー
プ毎に割り当てることによって、送受信信号の管理が容
易になるという効果がある。According to the second aspect of the present invention, there is an effect that the transmission / reception signals can be easily managed by using a plurality of reference signal frequencies and allocating them to each terminal or each group of terminals.
【図１】本発明の一実施例に用いる送信回路のブロック
図である。FIG. 1 is a block diagram of a transmission circuit used in an embodiment of the present invention.
【図２】本発明の一実施例に用いる受信回路のブロック
図である。FIG. 2 is a block diagram of a receiver circuit used in an embodiment of the present invention.
【図３】本発明の他の実施例に用いる送信回路のブロッ
ク図である。FIG. 3 is a block diagram of a transmission circuit used in another embodiment of the present invention.
【図４】本発明の他の実施例の動作説明図である。FIG. 4 is an operation explanatory diagram of another embodiment of the present invention.
【図５】従来例に用いる送信回路のブロック図である。FIG. 5 is a block diagram of a transmission circuit used in a conventional example.
【図６】従来例に用いる受信回路のブロック図である。FIG. 6 is a block diagram of a receiving circuit used in a conventional example.
１ 送信回路 ２ 受信回路 １１ 周波数変換回路 １２ 局部発振器 １３ 増幅回路 １４ 出力回路 １５ アンテナ １６ 増幅回路 １７ 混合回路 ２１ 周波数変換回路 ２３ 増幅回路 ２４ 入力回路 ２５ アンテナ ２６ フィルタ ２７ フィルタ ２８ 増幅回路 1 transmitter circuit 2 receiver circuit 11 frequency converter circuit 12 local oscillator 13 amplifier circuit 14 output circuit 15 antenna 16 amplifier circuit 17 mixing circuit 21 frequency converter circuit 23 amplifier circuit 24 input circuit 25 antenna 26 filter 27 filter 28 amplifier circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 盛野 信治 大阪府門真市大字門真1048番地 松下電工 株式会社内 (72)発明者 小川 温雄 大阪府門真市大字門真1048番地 松下電工 株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shinji Morino 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Atsushi Ogawa, 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd.
Claims (2)
送受信する系において、局部発振周波数の基準信号を送
出する送信回路を特定の端末器に備え、他の端末器は、
前記基準信号を受信し、受信した基準信号に基づいて、
送受信周波信号と中間周波信号との周波数変換用の局部
発振周波信号を作成する送受信回路を備えることを特徴
とするワイヤレス伝送方式。1. In a system for wirelessly transmitting and receiving a signal between a plurality of terminal devices, a specific terminal device is provided with a transmission circuit for transmitting a reference signal of a local oscillation frequency, and the other terminal devices are:
Receiving the reference signal, based on the received reference signal,
A wireless transmission system, comprising: a transmission / reception circuit that creates a local oscillation frequency signal for frequency conversion between a transmission / reception frequency signal and an intermediate frequency signal.
信号を送出する送信回路を備え、他の端末器は、端末器
毎又は端末器のグループ毎に異なる周波数の基準信号を
利用して局部発振周波信号を作成する送受信回路を備え
ることを特徴とする請求項１記載のワイヤレス伝送方
式。2. A specific terminal device comprises a transmission circuit for transmitting reference signals of a plurality of frequencies, and another terminal device uses a reference signal of a different frequency for each terminal device or each group of terminals. The wireless transmission system according to claim 1, further comprising a transmission / reception circuit that creates a local oscillation frequency signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20036191A JP2582963B2 (en) | 1991-08-09 | 1991-08-09 | Wireless transmission method |
| US07/920,874 US5355523A (en) | 1991-08-09 | 1992-07-28 | Wireless transmission/reception system including transmitting terminal producing multiple frequency local oscillation signals and receiving terminal storing a local oscillation signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20036191A JP2582963B2 (en) | 1991-08-09 | 1991-08-09 | Wireless transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0548491A true JPH0548491A (en) | 1993-02-26 |
| JP2582963B2 JP2582963B2 (en) | 1997-02-19 |
Family
ID=16423026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20036191A Expired - Lifetime JP2582963B2 (en) | 1991-08-09 | 1991-08-09 | Wireless transmission method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2582963B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003163601A (en) * | 2001-11-27 | 2003-06-06 | Sharp Corp | Millimeter wave radio transmitter, millimeter wave radio receiver and millimeter wave band communication system |
| WO2003069792A1 (en) * | 2002-02-18 | 2003-08-21 | Communications Research Laboratory, Independent Administrative Institution | Radio communication method and system for performing communication among a plurality of radio communication terminals |
| WO2003073628A1 (en) * | 2002-02-28 | 2003-09-04 | Sharp Kabushiki Kaisha | Microwave band radio transmission device, microwave band radio reception device, and microwave band radio communication system |
| JP2003258655A (en) * | 2002-02-27 | 2003-09-12 | Communication Research Laboratory | Transmitter and transmission method, receiver and reception method, and radio communication apparatus and radio communication method |
| WO2003079564A1 (en) * | 2002-03-15 | 2003-09-25 | Communications Research Laboratory, Independent Administrative Institution | Radio communication method and system |
| WO2003084093A1 (en) * | 2002-03-29 | 2003-10-09 | Communications Research Laboratory, Independent Administrative Institution | Radio communicate method and system |
| JP2007251989A (en) * | 2000-12-13 | 2007-09-27 | Eudyna Devices Inc | Transmitter and receiver |
| US7570919B2 (en) | 2000-12-13 | 2009-08-04 | Fujitsu Quantum Devices Limited | Transmitter, receiver, and radio communications system and method |
| JP2016025395A (en) * | 2014-07-16 | 2016-02-08 | Kddi株式会社 | Optical transmission device, wireless transmission device, and wireless reception device |
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|---|---|---|---|---|
| JPS61163742A (en) * | 1985-01-12 | 1986-07-24 | Nec Corp | Privacy telephone set |
| JPS63220627A (en) * | 1987-03-10 | 1988-09-13 | Mitsubishi Electric Corp | Signal transmission equipment |
| JPH034142A (en) * | 1989-06-01 | 1991-01-10 | Nippon Chem Ind Co Ltd | Blaine air permeability type powder fineness measuring instrument |
-
1991
- 1991-08-09 JP JP20036191A patent/JP2582963B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163742A (en) * | 1985-01-12 | 1986-07-24 | Nec Corp | Privacy telephone set |
| JPS63220627A (en) * | 1987-03-10 | 1988-09-13 | Mitsubishi Electric Corp | Signal transmission equipment |
| JPH034142A (en) * | 1989-06-01 | 1991-01-10 | Nippon Chem Ind Co Ltd | Blaine air permeability type powder fineness measuring instrument |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007251989A (en) * | 2000-12-13 | 2007-09-27 | Eudyna Devices Inc | Transmitter and receiver |
| US7570919B2 (en) | 2000-12-13 | 2009-08-04 | Fujitsu Quantum Devices Limited | Transmitter, receiver, and radio communications system and method |
| JP2003163601A (en) * | 2001-11-27 | 2003-06-06 | Sharp Corp | Millimeter wave radio transmitter, millimeter wave radio receiver and millimeter wave band communication system |
| WO2003069792A1 (en) * | 2002-02-18 | 2003-08-21 | Communications Research Laboratory, Independent Administrative Institution | Radio communication method and system for performing communication among a plurality of radio communication terminals |
| US7302236B2 (en) | 2002-02-18 | 2007-11-27 | National Institute Of Information And Communications Technology | Radio communication method and system for performing communication among a plurality of radio communication terminals |
| JP2003258655A (en) * | 2002-02-27 | 2003-09-12 | Communication Research Laboratory | Transmitter and transmission method, receiver and reception method, and radio communication apparatus and radio communication method |
| WO2003073628A1 (en) * | 2002-02-28 | 2003-09-04 | Sharp Kabushiki Kaisha | Microwave band radio transmission device, microwave band radio reception device, and microwave band radio communication system |
| WO2003079564A1 (en) * | 2002-03-15 | 2003-09-25 | Communications Research Laboratory, Independent Administrative Institution | Radio communication method and system |
| WO2003084093A1 (en) * | 2002-03-29 | 2003-10-09 | Communications Research Laboratory, Independent Administrative Institution | Radio communicate method and system |
| US7292831B2 (en) | 2002-03-29 | 2007-11-06 | National Institute Of Information And Communications Technology | Radio communicate method and system |
| JP2016025395A (en) * | 2014-07-16 | 2016-02-08 | Kddi株式会社 | Optical transmission device, wireless transmission device, and wireless reception device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2582963B2 (en) | 1997-02-19 |
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