JP2002290270A - Wireless unit - Google Patents
Wireless unitInfo
- Publication number
- JP2002290270A JP2002290270A JP2001084887A JP2001084887A JP2002290270A JP 2002290270 A JP2002290270 A JP 2002290270A JP 2001084887 A JP2001084887 A JP 2001084887A JP 2001084887 A JP2001084887 A JP 2001084887A JP 2002290270 A JP2002290270 A JP 2002290270A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- transceiver
- local oscillation
- transmission
- 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.)
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- Transceivers (AREA)
- Superheterodyne Receivers (AREA)
- Transmitters (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、同一の周波数を送
受信する送受信部を２系統以上備える無線機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio having two or more transmission / reception units for transmitting / receiving the same frequency.
【０００２】[0002]
【従来の技術】携帯電話機等の無線機は、スーパーへテ
ロダイン方式が採用されており、受信した高周波信号を
中間周波数に変換するために、周波数シンセサイザによ
り構成される局部発振器を有している。近年、周波数を
高速に切り替えることが必要とされ、２つの周波数シン
セサイザを切り替えて、周波数を高速に切り替えること
が提案されている（例えば、特開平４−３５１０２５号
公報）。すなわち、ＰＨＳシステムのようなＴＤＭＡ
（時分割多元接続方式）−ＴＤＤ方式では、スロット毎
にチャネル（周波数）を切り替える必要がある。よっ
て、局部発振器は、安定した局部発振信号を出力しなが
ら、局部発振信号の周波数を高速で切り替える必要があ
る。2. Description of the Related Art A radio apparatus such as a portable telephone adopts a super heterodyne system, and has a local oscillator constituted by a frequency synthesizer for converting a received high-frequency signal into an intermediate frequency. In recent years, it has become necessary to switch the frequency at a high speed, and it has been proposed to switch between two frequency synthesizers to switch the frequency at a high speed (for example, Japanese Patent Application Laid-Open No. 4-35125). That is, TDMA like PHS system
(Time Division Multiple Access System) In the TDD system, it is necessary to switch the channel (frequency) for each slot. Therefore, the local oscillator needs to switch the frequency of the local oscillation signal at a high speed while outputting a stable local oscillation signal.
【０００３】このように、複数の周波数シンセサイザを
切り替えて局部発振回路を構成すると、一方のシンセサ
イザの出力が他方のシンセサイザに回り込み、シンセサ
イザ間のアイソレーションを強化しなければならない問
題点があり、この解決方法も前述した特許公報に提案さ
れている。As described above, when a local oscillator circuit is formed by switching a plurality of frequency synthesizers, there is a problem that the output of one synthesizer goes to the other synthesizer, and the isolation between the synthesizers must be strengthened. A solution is also proposed in the aforementioned patent publication.
【０００４】[0004]
【発明が解決しようとする課題】しかし、一つの無線機
に２台以上の送受信部を備えると、新たな問題が生じ
る。However, if two or more transmission / reception units are provided in one radio, a new problem arises.
【０００５】例えば、基地局装置は、複数の移動機と異
なる周波数で通信をするので、送受信部は異なる周波数
で同時に動作していることから送受信機間の干渉が問題
となる。すなわち、２台（２系統）の送受信機を有する
場合、各送受信機は異なる周波数で送受信動作をしてい
るので、局部発振器は異なる周波数の信号を生成してい
る。そして、２系統の送受信機の双方が同時に動作して
いるので、局部発振器同士が結合しやすく、他方の局部
発振器に高周波信号が回り込みやすい。よって、局部発
振器から出力される局部発振信号にスプリアスが含ま
れ、Ｓ／Ｎが劣化する。[0005] For example, since the base station apparatus communicates with a plurality of mobile stations at different frequencies, interference between the transceivers becomes a problem since the transmitting and receiving units operate simultaneously at different frequencies. That is, when there are two transceivers (two systems), each local transceiver performs a transmitting / receiving operation at a different frequency, so that the local oscillator generates a signal at a different frequency. Since both of the two transceivers are operating at the same time, the local oscillators are easily coupled to each other, and the high-frequency signal is likely to flow into the other local oscillator. Therefore, spurious is included in the local oscillation signal output from the local oscillator, and S / N deteriorates.
【０００６】さらに、局部発振信号は緩衝増幅器で増幅
された後にミキサに加えられ、周波数変換に供せられる
が、緩衝増幅器で増幅された後の局部発振信号はレベル
が高く、他の回路部分に回り込みやすい。送受信機を１
系統しか有さない場合には非動作側のシンセサイザに接
続されている緩衝増幅器の動作を停止すれば、シンセサ
イザの動作を停止することなく、同一送受信機内でのシ
ンセサイザ間の回り込みは抑制できる。しかし、２系統
の送受信機を有し、同時に送受信している場合には、緩
衝増幅器の動作を停止することができず、無線機内には
近接した周波数で高いレベルの局部発振信号が存在して
いる。Further, the local oscillation signal is amplified by a buffer amplifier and then applied to a mixer to be subjected to frequency conversion. The local oscillation signal amplified by the buffer amplifier has a high level and is transmitted to other circuit parts. Easy to go around. One transceiver
When only the system is provided, by stopping the operation of the buffer amplifier connected to the synthesizer on the non-operation side, it is possible to suppress the wraparound between the synthesizers in the same transceiver without stopping the operation of the synthesizer. However, when two transceivers are used and transmitting and receiving at the same time, the operation of the buffer amplifier cannot be stopped, and a high-level local oscillation signal at a close frequency exists in the radio. I have.
【０００７】すなわち、図３に示すように、同一の送受
信機におけるシンセサイザ間の回り込みはａ、ｂ、ｃの
経路が考えられるが、ａ、ｃの経路による回り込みは、
緩衝増幅器１７ａの電源を遮断して、緩衝増幅器１７ａ
の動作を停止することで抑制することができる。また、
ｂの経路による回り込みは発振器１８ａの出力レベル
が、緩衝増幅器１７ａの出力レベルより低いことから、
シールドにより抑制することが容易である。なお、図３
において破線で示した部分は動作していない部分を示
す。すなわち、第１系統（１系）の送受信機において緩
衝増幅器１７ａは動作しておらず、第２系統（２系）の
送受信機において緩衝増幅器２７ｂは動作していない。[0009] That is, as shown in FIG. 3, the wraparound between the synthesizers in the same transceiver can be considered through the paths a, b, and c.
The power supply of the buffer amplifier 17a is cut off,
Can be suppressed by stopping the operation of. Also,
The sneak path b causes the output level of the oscillator 18a to be lower than the output level of the buffer amplifier 17a.
It is easy to suppress with a shield. Note that FIG.
In FIG. 7, the part shown by a broken line indicates a part not operating. That is, the buffer amplifier 17a is not operating in the first system (system 1) transceiver, and the buffer amplifier 27b is not operating in the second system (system 2) transceiver.
【０００８】また、送受信機間の回り込みはｄ、ｅ、ｆ
の経路が考えられる。このうち経路ｄ、ｆによる回り込
みは、緩衝増幅器１７ｂ、２７ａで増幅された後の高い
レベルの信号であるため、この局部発振信号の回り込み
を抑制することは容易ではない。The wraparound between the transmitter and the receiver is d, e, f
Route is conceivable. Of these, the wraparound by the paths d and f is a high-level signal amplified by the buffer amplifiers 17b and 27a, so it is not easy to suppress the wraparound of the local oscillation signal.
【０００９】この送受信機間の回り込みを抑えるために
は、送受信機（局部発振器）からの高周波信号の漏れを
抑制し、送受信機間のアイソレーションを向上させるこ
とが考えられるが、送受信機のシールドを強化するため
に、シールドのための金属ケースや、アース板等を新た
に設ける必要があり、設計上の障害となっていた。In order to suppress the wraparound between the transceivers, it is conceivable to suppress the leakage of the high-frequency signal from the transceiver (local oscillator) and improve the isolation between the transceivers. In order to reinforce this, it is necessary to newly provide a metal case for shielding, a ground plate, and the like, which has been an obstacle in design.
【００１０】また、２系統の送受信機で中間周波数を変
え、局部発振周波数を相互に影響のない周波数に変える
ことにより、２台の送受信機間で局部発振信号の回り込
みによる影響が抑制できるが、送受信機毎に中間周波数
を変えると、送受信機毎に異なる設計をしなければなら
ず、コスト面でも困難である。By changing the intermediate frequency between the two transceivers and changing the local oscillation frequency to a frequency that does not affect each other, the influence of the local oscillation signal wraparound between the two transceivers can be suppressed. If the intermediate frequency is changed for each transceiver, it is necessary to design differently for each transceiver, which is difficult in terms of cost.
【００１１】本発明は、２つの系統の送受信機で同一の
中間周波数を用いつつ、簡単なシールドでもＳ／Ｎの劣
化、スプリアスの発生が少ない無線機を提供することを
目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a radio apparatus in which the transmission / reception of two systems uses the same intermediate frequency, and the S / N is hardly deteriorated and spurious is less generated even with a simple shield.
【００１２】[0012]
【課題を解決するための手段】第１の発明は、略同一の
周波数を受信可能なスーパーへテロダイン方式の受信機
を複数有する無線機において、第１の受信機と第２の受
信機とは、同一の受信中間周波数を用いると共に、前記
第１の受信機と前記第２の受信機とには同一の周波数の
信号を受信する場合にも、異なる周波数の局部発振信号
が供給される。According to a first aspect of the present invention, there is provided a radio having a plurality of super heterodyne type receivers capable of receiving substantially the same frequency, wherein the first and second receivers are Also, when the same reception intermediate frequency is used and the first receiver and the second receiver receive signals of the same frequency, local oscillation signals of different frequencies are supplied.
【００１３】第２の発明は、局部発振器からの信号によ
り、送信中間周波数信号を送信信号の周波数に変換する
送信機を複数有する無線機において、第１の送信機と第
２の送信機とは、同一の送信中間周波数を用いると共
に、前記第１の受信機と前記第２の受信機とには同一の
周波数の信号を送信する場合にも、異なる周波数の局部
発振信号が供給される。According to a second aspect of the present invention, there is provided a radio having a plurality of transmitters for converting a transmission intermediate frequency signal into a frequency of a transmission signal by a signal from a local oscillator, wherein the first transmitter and the second transmitter are Also, when the same transmission intermediate frequency is used and a signal of the same frequency is transmitted to the first receiver and the second receiver, local oscillation signals of different frequencies are supplied.
【００１４】第３の発明は、局部発振器からの信号によ
り送信中間周波数信号を送信信号の周波数に変換し、ま
た、局部発振器からの信号により受信信号を受信中間周
波数信号の周波数に変換する送受信機を複数有する無線
機において、第１の送受信機と第２の送受信機とは、同
一の送信中間周波数を用い、同一の受信中間周波数を用
いると共に、前記第１の送受信機と前記第２の送受信機
とには同一の周波数の信号を送信する場合にも、異なる
周波数の局部発振信号が供給され、かつ、前記第１の送
受信機と前記第２の送受信機とが同一の周波数の信号を
受信する場合にも、異なる周波数の局部発振信号が供給
される。According to a third aspect of the present invention, there is provided a transceiver for converting a transmission intermediate frequency signal to a frequency of a transmission signal by a signal from a local oscillator, and converting a reception signal to a frequency of a reception intermediate frequency signal by a signal from the local oscillator. , A first transceiver and a second transceiver use the same transmission intermediate frequency, use the same reception intermediate frequency, and communicate with the first transceiver and the second transceiver. When transmitting signals of the same frequency to the transmitter, local oscillation signals of different frequencies are supplied, and the first transceiver and the second transceiver receive signals of the same frequency. In this case, local oscillation signals having different frequencies are supplied.
【００１５】第４の発明は、第３の発明において、前記
送受信機は、同一周波数の送信信号と受信信号とを送受
信する、時分割デュープレクス方式の送受信機であるこ
とを特徴とする。In a fourth aspect based on the third aspect, the transceiver is a time-division duplex transceiver for transmitting and receiving a transmission signal and a reception signal having the same frequency.
【００１６】第５の発明は、第１〜第４の発明におい
て、前記局部発振信号を生成する局部発振回路は、複数
の発振器と、前記複数の発振器を切り替える切替手段を
有することを特徴とする。According to a fifth aspect of the present invention, in the first to fourth aspects, the local oscillation circuit for generating the local oscillation signal has a plurality of oscillators and switching means for switching the plurality of oscillators. .
【００１７】第６の発明は、第１〜第４の発明におい
て、前記第１の局部発振信号と、前記第２の局部発振信
号との周波数の差は、前記送信中間周波数又は受信中間
周波数の倍であることを特徴とする。In a sixth aspect based on the first to fourth aspects, the difference between the frequency of the first local oscillation signal and the frequency of the second local oscillation signal is equal to the transmission intermediate frequency or the reception intermediate frequency. It is characterized by being twice.
【００１８】第７の発明は、第１又は第３〜第６の発明
において、前記第１の受信機又は前記第１の送受信機の
局部発振信号は受信信号より高い周波数とし、前記第２
の受信機又は前記第２の送受信機の局部発振信号は受信
信号より低い周波数としたことを特徴とする。In a seventh aspect based on the first or third to sixth aspects, a local oscillation signal of the first receiver or the first transceiver is higher in frequency than a received signal, and
The local oscillation signal of the receiver or the second transceiver has a lower frequency than the received signal.
【００１９】第８の発明は、第２〜第６の発明におい
て、前記第１の送信機又は前記第１の送受信機の局部発
振信号は送信信号より高い周波数とし、前記第２の送信
機又は前記第２の送受信機の局部発振信号は送信信号よ
り低い周波数としたことを特徴とする。In an eighth aspect based on the second to sixth aspects, the local oscillation signal of the first transmitter or the first transceiver has a higher frequency than the transmission signal, and the second transmitter or The local oscillation signal of the second transceiver is lower in frequency than the transmission signal.
【００２０】さらに、前記第１の送受信機（送信機）又
は第２の送受信機（送信機）のいずれかに、送受信の極
性を反転させる反転回路を設けることもできる。Further, either the first transceiver (transmitter) or the second transceiver (transmitter) may be provided with an inversion circuit for inverting the polarity of transmission and reception.
【００２１】[0021]
【発明の作用および効果】第１の発明では、第１の受信
機と第２の受信機とは、同一の受信中間周波数を用いる
と共に、第１の受信機と第２の受信機とには同一の周波
数の信号を受信する場合にも異なる周波数の局部発振信
号が供給されるので、局部発振信号が近接した周波数に
ならず、局部発振器間の干渉が抑制され、局部発振器か
らのスプリアスの発生を抑制し、局部発振信号のＳ／Ｎ
の劣化を抑制することができることから、受信感度の劣
化を抑制することができる。According to the first aspect of the present invention, the first receiver and the second receiver use the same reception intermediate frequency, and the first receiver and the second receiver use the same reception intermediate frequency. Even when receiving signals of the same frequency, local oscillation signals of different frequencies are supplied, so that the local oscillation signals do not become close frequencies, interference between local oscillators is suppressed, and spurious generation from the local oscillator occurs And the S / N of the local oscillation signal
Can be suppressed, so that the deterioration of the receiving sensitivity can be suppressed.
【００２２】第２の発明では、第１の送信機と第２の送
信機とは、同一の送信中間周波数を用いると共に、第１
の受信機と第２の受信機とには同一の周波数の信号を送
信する場合にも異なる周波数の局部発振信号が供給され
るので、局部発振信号が近接した周波数にならず、局部
発振器間の干渉が抑制され、局部発振器からのスプリア
スの発生を抑制し、局部発振信号のＳ／Ｎの劣化を抑制
することができることから、送信信号のスプリアスを抑
制し、Ｓ／Ｎ及び送受信相互変調（Ｉｎｔｅｒｍｏｄｕ
ｌａｔｉｏｎ）の劣化を抑制することができる。In the second invention, the first transmitter and the second transmitter use the same transmission intermediate frequency,
Since the local oscillation signal of a different frequency is supplied to the receiver of the second and the second receiver even when transmitting the signal of the same frequency, the local oscillation signal does not become close to the frequency, and the local oscillator Interference is suppressed, spurious emission from a local oscillator can be suppressed, and deterioration of S / N of a local oscillation signal can be suppressed. Therefore, spurious of a transmission signal can be suppressed, and S / N and transmission / reception intermodulation (Intermodu) can be suppressed.
) can be suppressed.
【００２３】第３の発明では、第１の送受信機と第２の
送受信機とは、同一の送信中間周波数を用い、同一の受
信中間周波数を用いると共に、第１の送受信機と第２の
送受信機とには同一の周波数の信号を送信する場合にも
異なる周波数の局部発振信号が供給され、かつ、第１の
送受信機と第２の送受信機とには同一の周波数の信号を
受信する場合にも異なる周波数の局部発振信号が供給さ
れるので、局部発振信号が近接した周波数にならず、局
部発振器間の干渉が抑制され、局部発振器からのスプリ
アスの発生を抑制し、局部発振信号のＳ／Ｎの劣化を抑
制することができることから、送信信号のスプリアスを
抑制し、Ｓ／Ｎ及び送受信相互変調（Ｉｎｔｅｒｍｏｄ
ｕｌａｔｉｏｎ）の劣化を抑制することができるととも
に、受信感度の劣化を抑制することができる。In the third invention, the first transceiver and the second transceiver use the same transmission intermediate frequency, use the same reception intermediate frequency, and perform the second transmission and reception with the first transceiver. When a local oscillation signal of a different frequency is supplied even when a signal of the same frequency is transmitted to the first transceiver, and a signal of the same frequency is received by the first transceiver and the second transceiver. Since the local oscillation signal having a different frequency is supplied to the local oscillation signal, the local oscillation signal does not become close to the frequency, the interference between the local oscillators is suppressed, the generation of spurious from the local oscillator is suppressed, and the S / N can be suppressed, so that spurious of the transmission signal can be suppressed, and S / N and transmission / reception intermodulation (Intermod) can be suppressed.
This can suppress the deterioration of the reception sensitivity as well as the deterioration of the reception sensitivity.
【００２４】[0024]
【発明の実施の形態】図１は、本発明の第１の実施の形
態の無線機のブロック図である。FIG. 1 is a block diagram of a wireless device according to a first embodiment of the present invention.
【００２５】アンテナ１は分配器２を介して、２台の送
受信機（第１系統の送受信機、第２系統の送受信機）が
接続されており、アンテナ１で、他の無線機からの電波
を捕捉し、他の無線機に対し電波を放射する。分配器２
は、第１系統（１系）の送受信機と第２系統（２系）の
送受信機とをアンテナ１に接続するもので、１系、２系
の送受信機からの電力を合成してアンテナ１に入力し、
アンテナ１からの高周波信号を１系、２系の送受信機に
分配する。The antenna 1 is connected to two transceivers (a first system transceiver and a second system transceiver) via a distributor 2. And radiate radio waves to other wireless devices. Distributor 2
Connects a transceiver of the first system (system 1) and a transceiver of the second system (system 2) to the antenna 1, and combines the power from the transceivers of the systems 1 and 2 to combine the antenna 1 And enter
The high-frequency signal from the antenna 1 is distributed to the first and second transceivers.
【００２６】送信中間周波数部１２で生成された送信信
号と局部発振器１５で生成された局部発振信号とはミキ
サ１１で混合され、送信周波数の信号に周波数変換され
て、増幅器（図示省略）で増幅後、アンテナ１に加えら
れる。The transmission signal generated by the transmission intermediate frequency unit 12 and the local oscillation signal generated by the local oscillator 15 are mixed by the mixer 11, converted into a signal of the transmission frequency, and amplified by an amplifier (not shown). Later, it is added to the antenna 1.
【００２７】一方、受信信号と局部発振器１５で生成さ
れた局部発振信号とはミキサ１３で混合され、受信中間
周波数信号に周波数変換されて、受信中間周波数部１４
において増幅、復調等の処理がされる。On the other hand, the received signal and the local oscillation signal generated by the local oscillator 15 are mixed by the mixer 13 and frequency-converted into a reception intermediate frequency signal.
, Processing such as amplification and demodulation is performed.
【００２８】局部発振器１５は、２つの発振器１８ａ、
１８ｂを備えており、スイッチ１６により切り替えられ
て、いずれか一方の発振器からの信号がミキサ１１、１
３に出力される。発振器１８ａ、１８ｂはＰＬＬシンセ
サイザにより構成されており、制御部１９からの指令信
号により発振周波数を変化させる。緩衝増幅器１７ａ、
１７ｂは、発振器１８ａ、１８ｂの出力を増幅するとと
もに、切替スイッチ１６の動作に基づく発振器１８ａ、
１８ｂの負荷変動により、出力周波数が変動することが
ないようにしている。この緩衝増幅器１７ａ、１７ｂ
は、不要な局部発振信号の出力を抑制するために、その
発振器からの出力が不要な（すなわち、切替スイッチ１
６により出力が切断されており、発振器がミキサに接続
されていない）場合には、電源が遮断され、動作が停止
するように制御される。The local oscillator 15 has two oscillators 18a,
18b, which is switched by the switch 16 so that the signal from one of the oscillators is
3 is output. Each of the oscillators 18a and 18b is constituted by a PLL synthesizer, and changes an oscillation frequency according to a command signal from the control unit 19. Buffer amplifier 17a,
17b amplifies the outputs of the oscillators 18a and 18b, and generates the oscillators 18a and 18b based on the operation of the changeover switch 16.
The output frequency does not fluctuate due to the load fluctuation of 18b. These buffer amplifiers 17a, 17b
Does not require the output from the oscillator to suppress the output of the unnecessary local oscillation signal (that is, the changeover switch 1).
6, when the output is cut off and the oscillator is not connected to the mixer), the power is cut off and the operation is controlled to stop.
【００２９】切替スイッチ１６は制御部１９により制御
されており、緩衝増幅器１７ａ、１７ｂのオンオフと同
期して、いずれの発振器１８ａ、１８ｂの出力をミキサ
に出力するかを切り替える。The changeover switch 16 is controlled by the control unit 19, and switches which of the oscillators 18a and 18b outputs the output to the mixer in synchronization with the turning on and off of the buffer amplifiers 17a and 17b.
【００３０】制御部１９はＣＰＵ、メモリ等で構成され
局部発振器１８ａ、１８ｂの出力周波数、局部発振器１
８ａ、１８ｂを切り替えるスイッチ１６の動作、緩衝増
幅器１７ａ、１７ｂの動作／停止の制御の他、送受信タ
イミングの生成等をして、無線機の各部を制御する。The control unit 19 comprises a CPU, a memory, etc., and outputs the local oscillators 18a, 18b,
In addition to the operation of the switch 16 for switching between 8a and 18b, the control of the operation / stop of the buffer amplifiers 17a and 17b, and the generation of transmission / reception timing and the like, the respective sections of the radio are controlled.
【００３１】また、２系の送受信機は、前述した１系の
送受信機と同様の構成を有し、２系は別個の制御部２９
により制御され、１系、２系は互いに別個独立に動作す
る。The transmitter / receiver of the second system has the same configuration as the transmitter / receiver of the first system described above.
And the first and second systems operate independently of each other.
【００３２】図２は、本発明の第２の実施の形態の無線
機のブロック図である。FIG. 2 is a block diagram of a wireless device according to a second embodiment of the present invention.
【００３３】第２の実施の形態の無線機は、前述した第
１の実施の形態の無線機と同様に２台の送受信機（第１
系統の送受信機、第２系統の送受信機）を有している
が、各々アンテナ１ａ、１ｂを有している。この第１系
統（１系）の送受信機と第２系統（２系）の送受信機と
は同一の構成を有しているので、まず第１系統の送受信
機について説明する。The wireless device of the second embodiment has two transceivers (the first transceiver) in the same manner as the wireless device of the first embodiment.
System and a second system), each having an antenna 1a and 1b. Since the transceiver of the first system (system 1) and the transceiver of the second system (system 2) have the same configuration, the transceiver of the first system will be described first.
【００３４】第１系統の送受信機は、アンテナ１ａで他
の無線機からの電波を捕捉し、他の無線機に対し電波を
放射する。分配器２ａは、アンテナ１ａを、送信部（ミ
キサ１１、送信中間周波数部１２）と、受信部（ミキサ
１３、受信中間周波数部１４）とに接続するもので、ア
ンテナ１ａからの高周波信号を受信部１３、１４に送り
送信部１１、１２からの信号をアンテナ１ａに入力す
る。The transceiver of the first system captures a radio wave from another radio with the antenna 1a and radiates the radio to the other radio. The distributor 2a connects the antenna 1a to a transmitting unit (mixer 11, transmission intermediate frequency unit 12) and a receiving unit (mixer 13, reception intermediate frequency unit 14), and receives a high-frequency signal from the antenna 1a. The signals are sent to the units 13 and 14 and input from the transmitting units 11 and 12 to the antenna 1a.
【００３５】送信中間周波数部１２で生成された送信信
号と局部発振器１５で生成された局部発振信号とはミキ
サ１１で混合され、送信周波数の信号に周波数変換され
て、増幅器（図示省略）で増幅後、分配器２ａを介し
て、アンテナ１ａに加えられる。The transmission signal generated by the transmission intermediate frequency section 12 and the local oscillation signal generated by the local oscillator 15 are mixed by the mixer 11, frequency-converted into a signal of the transmission frequency, and amplified by an amplifier (not shown). Thereafter, the signal is added to the antenna 1a via the distributor 2a.
【００３６】ミキサ１１と分配器２ａとの間には、高周
波スイッチ３ａが設けられており、１系の送信機の出力
を１系の分配器２ａに導くか、２系の分配器２ｂに導く
かを切り替える。すなわち、高周波スイッチ３ａの作用
により、１系の送信機の出力が１系のアンテナ１ａから
送信されるか、２系のアンテナ１ｂから送信されるかが
定まる。A high-frequency switch 3a is provided between the mixer 11 and the distributor 2a, and guides the output of the transmitter of the first system to the distributor 2a of the first system or to the distributor 2b of the second system. Switch. That is, the operation of the high-frequency switch 3a determines whether the output of the first-system transmitter is transmitted from the first-system antenna 1a or the second-system antenna 1b.
【００３７】一方、受信信号と局部発振器１５で生成さ
れた局部発振信号とはミキサ１３で混合され、受信中間
周波数信号に周波数変換されて、受信中間周波数部１４
において増幅、復調等の処理がされる。On the other hand, the received signal and the local oscillation signal generated by the local oscillator 15 are mixed by the mixer 13 and frequency-converted into a reception intermediate frequency signal.
, Processing such as amplification and demodulation is performed.
【００３８】局部発振器１５は、２つの発振器１８ａ、
１８ｂを備えており、スイッチ１６により切り替えられ
て、いずれか一方の発振器からの信号がミキサ１１、１
３に出力される。発振器１８ａ、１８ｂはＰＬＬシンセ
サイザにより構成されており、制御部１９からの指令信
号により発振周波数を変化させる。緩衝増幅器１７ａ、
１７ｂは、発振器１８ａ、１８ｂの出力を増幅するとと
もに、切替スイッチ１６の動作に基づく発振器１８ａ、
１８ｂの負荷変動により、出力周波数が変動することが
ないようにしている。この緩衝増幅器１７ａ、１７ｂ
は、不要な局部発振信号の出力を抑制するために、その
発振器からの出力が不要な（すなわち、切替スイッチ１
６により出力が切断されており、発振器がミキサに接続
されていない）場合には、電源が遮断され、動作が停止
するように制御される。The local oscillator 15 has two oscillators 18a,
18b, which is switched by the switch 16 so that the signal from one of the oscillators is
3 is output. Each of the oscillators 18a and 18b is constituted by a PLL synthesizer, and changes an oscillation frequency according to a command signal from the control unit 19. Buffer amplifier 17a,
17b amplifies the outputs of the oscillators 18a and 18b, and generates the oscillators 18a and 18b based on the operation of the switch 16.
The output frequency does not fluctuate due to the load fluctuation of 18b. These buffer amplifiers 17a, 17b
Does not require the output from the oscillator to suppress the output of the unnecessary local oscillation signal (that is, the changeover switch 1).
6, when the output is cut off and the oscillator is not connected to the mixer), the power is cut off and the operation is controlled to stop.
【００３９】切替スイッチ１６は制御部１９により制御
されており、緩衝増幅器１７ａ、１７ｂのオンオフと同
期して、いずれの発振器１８ａ、１８ｂの出力をミキサ
に出力するかを切り替える。The changeover switch 16 is controlled by the control unit 19, and switches which of the oscillators 18a and 18b outputs the output to the mixer in synchronization with the ON / OFF of the buffer amplifiers 17a and 17b.
【００４０】制御部１９はＣＰＵ、メモリ等で構成され
局部発振器１８ａ、１８ｂの出力周波数、局部発振器１
８ａ、１８ｂを切り替えるスイッチ１６の動作、緩衝増
幅器１７ａ、１７ｂの動作／停止の制御の他、送受信タ
イミングの生成等をして、無線機の各部を制御する。The control unit 19 comprises a CPU, a memory, etc., and outputs the local oscillators 18a, 18b, the local oscillator 1
In addition to the operation of the switch 16 for switching between 8a and 18b, the control of the operation / stop of the buffer amplifiers 17a and 17b, and the generation of transmission / reception timing and the like, the respective sections of the wireless device are controlled.
【００４１】また、２系の送受信機は、前述した１系の
送受信機と同様の構成を有し、２系は別個の制御部２９
により制御され、１系、２系は互いに別個独立に動作す
る。The transmitter / receiver of the second system has the same configuration as the transmitter / receiver of the first system, and the second system has a separate control unit 29.
And the first and second systems operate independently of each other.
【００４２】本発明では、第１の実施の形態及び第２の
実施の形態のいずれの無線機も、１系の送受信機と２系
の送受信機とで、異なる局部発振周波数を用いている。
具体的には、送信周波数と受信周波数とに同一の周波数
（１９００ＭＨｚ）を用いるＴＤＤ（Ｔｉｍｅ Ｄｉｖ
ｉｓｉｏｎ Ｄｕｐｌｅｘ）方式において、１系、２系
共に送信中間周波数及び受信中間周波数を２５０ＭＨｚ
としている。このとき１系の局部発振周波数は送信周波
数（受信周波数）より低い周波数の１６５０ＭＨｚと
し、２系の局部発振周波数は送信周波数（受信周波数）
より高い周波数の２１５０ＭＨｚとする。すなわち、１
系では、送受信周波数（送信周波数又は受信周波数）か
ら局部発振周波数を減じたもの（送受信周波数−局部発
振周波数）が送信中間周波数（受信中間周波数）とな
り、２系では、局部発振周波数から送受信周波数（送信
周波数又は受信周波数）を減じたもの（局部発振周波数
−送受信周波数）が送信中間周波数（受信中間周波数）
となる。換言すれば、１系と２系との局部発振周波数は
送信中間周波数（受信中間周波数）の２倍の周波数だけ
異なる周波数となる。In the present invention, both the first and second embodiments use different local oscillation frequencies for the first-system transceiver and the second-system transceiver.
More specifically, TDD (Time Div) using the same frequency (1900 MHz) for the transmission frequency and the reception frequency
transmission duplex frequency and reception intermediate frequency for both system 1 and system 2 are 250 MHz.
And At this time, the local oscillation frequency of the first system is 1650 MHz, which is lower than the transmission frequency (reception frequency), and the local oscillation frequency of the second system is the transmission frequency (reception frequency).
The higher frequency is set to 2150 MHz. That is, 1
In the system, a value obtained by subtracting the local oscillation frequency from the transmission / reception frequency (transmission frequency or reception frequency) (transmission / reception frequency-local oscillation frequency) becomes a transmission intermediate frequency (reception intermediate frequency). (Transmission frequency or reception frequency) minus (local oscillation frequency-transmission / reception frequency) is the transmission intermediate frequency (reception intermediate frequency)
Becomes In other words, the local oscillation frequencies of the first system and the second system are different from each other by twice the transmission intermediate frequency (reception intermediate frequency).
【００４３】以上、送信周波数と受信周波数とが同一周
波数の場合について説明したが、送信周波数と受信周波
数とは異なる周波数でもよい。Although the case where the transmission frequency and the reception frequency are the same has been described above, the transmission frequency and the reception frequency may be different.
【００４４】また、送信中間周波数と受信中間周波数と
が同一でなくてもよい。この場合、２系統の送受信機が
同一の送受信タイミングで動作して、同時に送信又は受
信すれば、前述と同様の問題が生じる。Further, the transmission intermediate frequency and the reception intermediate frequency do not have to be the same. In this case, if the two systems of transceivers operate at the same transmission / reception timing and transmit or receive simultaneously, the same problem as described above occurs.
【００４５】さらに、本実施の形態では、１系の送受信
機と２系の送受信機とで、受信信号の周波数と局部発振
周波数との上下関係が異なるので、同一の信号を受信し
たときに、１系と２系とで受信信号の波形が逆転する。
よって、いずれかの受信中間周波数部１４、２４に受信
信号の波形を反転させる反転回路を設けると、後のデー
タ処理に好都合である。Further, in the present embodiment, since the vertical relationship between the frequency of the received signal and the local oscillation frequency is different between the system 1 transceiver and the system 2 transceiver, when the same signal is received, The waveforms of the received signals are reversed between the first system and the second system.
Therefore, if an inverting circuit for inverting the waveform of the received signal is provided in one of the reception intermediate frequency units 14 and 24, it is convenient for the subsequent data processing.
【００４６】このように、本実施の形態では、１系の送
受信機と２系の送受信機とは、同一の送信中間周波数を
用い、同一の受信中間周波数を用いると共に、１系の送
受信機と２系の送受信機とが同一の周波数の信号を送信
する場合にも異なる周波数の局部発振信号を用い、か
つ、第１の送受信機と第２の送受信機とが同一の周波数
の信号を受信する場合にも異なる周波数の局部発振信号
を用いるので、二つの送受信機の局部発振信号が近接し
た周波数にならず、局部発振器間の干渉が抑制され、局
部発振信号のスプリアスの発生、Ｓ／Ｎの劣化を抑制す
ることができることから、送信信号のスプリアスを抑制
し、Ｓ／Ｎの劣化を抑制することができ、受信感度の劣
化を防止することができる。As described above, in the present embodiment, the first-system transceiver and the second-system transceiver use the same transmission intermediate frequency, use the same reception intermediate frequency, and communicate with the first-system transceiver. Even when the two transceivers transmit signals of the same frequency, local oscillation signals of different frequencies are used, and the first transceiver and the second transceiver receive signals of the same frequency. Also in this case, since the local oscillation signals of different frequencies are used, the local oscillation signals of the two transceivers do not become close frequencies, the interference between the local oscillators is suppressed, the generation of spurious local oscillation signals, and the S / N Since deterioration can be suppressed, spuriousness of a transmission signal can be suppressed, S / N deterioration can be suppressed, and deterioration of reception sensitivity can be prevented.
【図１】 本発明の第１の実施の形態の無線機のブロッ
ク図である。FIG. 1 is a block diagram of a wireless device according to a first embodiment of the present invention.
【図２】 本発明の第２の実施の形態の無線機のブロッ
ク図である。FIG. 2 is a block diagram of a wireless device according to a second embodiment of the present invention.
【図３】 従来の問題点を示す説明図である。FIG. 3 is an explanatory view showing a conventional problem.
１、１ａ、１ｂ アンテナ ２、２ａ、２ｂ 分配器 ３ａ、３ｂ 高周波スイッチ １１ 混合器（ミキサ） １２ 送信中間周波数部（送信ＩＦ部） １３ 混合器（ミキサ） １４ 受信中間周波数部（受信ＩＦ部） １５ 局部発振器 １６ 切替スイッチ １７ａ、１７ｂ 緩衝増幅器 １８ａ、１８ｂ 発振器 １９ 制御部 ２１ 混合器（ミキサ） ２２ 送信中間周波数部（送信ＩＦ部） ２３ 混合器（ミキサ） ２４ 受信中間周波数部（受信ＩＦ部） ２５ 局部発振器 ２６ 切替スイッチ ２７ａ、２７ｂ 緩衝増幅器 ２８ａ、２８ｂ 発振器 ２９ 制御部 DESCRIPTION OF SYMBOLS 1, 1a, 1b Antenna 2, 2a, 2b Distributor 3a, 3b High-frequency switch 11 Mixer (mixer) 12 Transmission intermediate frequency part (transmission IF part) 13 Mixer (mixer) 14 Reception intermediate frequency part (reception IF part) Reference Signs List 15 local oscillator 16 selector switch 17a, 17b buffer amplifier 18a, 18b oscillator 19 control unit 21 mixer (mixer) 22 transmission intermediate frequency unit (transmission IF unit) 23 mixer (mixer) 24 reception intermediate frequency unit (reception IF unit) 25 Local oscillator 26 Changeover switch 27a, 27b Buffer amplifier 28a, 28b Oscillator 29 Control unit
Claims (8)
テロダイン方式の受信機を複数有する無線機において、 第１の受信機と第２の受信機とは、同一の受信中間周波
数を用いると共に、前記第１の受信機と前記第２の受信
機とには、同一の周波数の信号を受信する場合にも、異
なる周波数の局部発振信号が供給されることを特徴とす
る無線機。1. A radio having a plurality of super heterodyne receivers capable of receiving substantially the same frequency, wherein the first receiver and the second receiver use the same reception intermediate frequency, A radio device wherein the first receiver and the second receiver are supplied with local oscillation signals of different frequencies even when receiving signals of the same frequency.
周波数信号を送信信号の周波数に変換する送信機を複数
有する無線機において、 第１の送信機と第２の送信機とは、同一の送信中間周波
数を用いると共に、前記第１の受信機と前記第２の受信
機とには、同一の周波数の信号を送信する場合にも、異
なる周波数の局部発振信号が供給されることを特徴とす
る無線機。2. A wireless device having a plurality of transmitters for converting a transmission intermediate frequency signal into a frequency of a transmission signal by a signal from a local oscillator, wherein the first transmitter and the second transmitter have the same transmission. In addition to using an intermediate frequency, local oscillation signals of different frequencies are supplied to the first receiver and the second receiver even when signals of the same frequency are transmitted. transceiver.
波数信号を送信信号の周波数に変換し、また、局部発振
器からの信号により受信信号を受信中間周波数信号の周
波数に変換する送受信機を複数有する無線機において、 第１の送受信機と第２の送受信機とは、同一の送信中間
周波数を用い、同一の受信中間周波数を用いると共に、 前記第１の送受信機と前記第２の送受信機とには、同一
の周波数の信号を送信する場合にも、異なる周波数の局
部発振信号が供給され、 かつ、前記第１の送受信機と前記第２の送受信機とに
は、同一の周波数の信号を受信する場合にも、異なる周
波数の局部発振信号が供給されることを特徴とする無線
機。3. A radio having a plurality of transceivers for converting a transmission intermediate frequency signal to a frequency of a transmission signal by a signal from a local oscillator and converting a reception signal to a frequency of a reception intermediate frequency signal by a signal from a local oscillator. In the device, the first transceiver and the second transceiver use the same transmission intermediate frequency, use the same reception intermediate frequency, and the first transceiver and the second transceiver Also, when transmitting signals of the same frequency, local oscillation signals of different frequencies are supplied, and the first transceiver and the second transceiver receive signals of the same frequency. In this case, a local oscillation signal of a different frequency is also supplied.
と受信信号とを送受信する、時分割デュープレクス方式
の送受信機であることを特徴とする請求項３に記載の無
線機。4. The transceiver according to claim 3, wherein the transceiver is a transceiver of a time division duplex system that transmits and receives a transmission signal and a reception signal of the same frequency.
路は、複数の発振器と、前記複数の発振器を切り替える
切替手段を有することを特徴とする請求項１から４のい
ずれか一つに記載の無線機。5. The local oscillation circuit according to claim 1, wherein the local oscillation circuit that generates the local oscillation signal includes a plurality of oscillators and a switching unit that switches between the plurality of oscillators. transceiver.
局部発振信号との周波数の差は、前記送信中間周波数又
は受信中間周波数の倍であることを特徴とする請求項１
から４のいずれか一つに記載の無線機。6. The apparatus according to claim 1, wherein the difference between the frequency of the first local oscillation signal and the frequency of the second local oscillation signal is twice the transmission intermediate frequency or the reception intermediate frequency.
The wireless device according to any one of items 1 to 4.
機の局部発振信号は受信信号より高い周波数とし、前記
第２の受信機又は前記第２の送受信機の局部発振信号は
受信信号より低い周波数としたことを特徴とする請求項
１又は３から６のいずれか一つに記載の無線機。7. The local oscillation signal of the first receiver or the first transceiver is higher in frequency than the reception signal, and the local oscillation signal of the second receiver or the second transceiver is a reception signal. 7. The wireless device according to claim 1, wherein the frequency is lower.
機の局部発振信号は送信信号より高い周波数とし、前記
第２の送信機又は前記第２の送受信機の局部発振信号は
送信信号より低い周波数としたことを特徴とする請求項
２から６のいずれか一つに記載の無線機。8. The local oscillation signal of the first transmitter or the first transceiver is higher in frequency than the transmission signal, and the local oscillation signal of the second transmitter or the second transceiver is a transmission signal. 7. The wireless device according to claim 2, wherein the frequency is lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001084887A JP2002290270A (en) | 2001-03-23 | 2001-03-23 | Wireless unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001084887A JP2002290270A (en) | 2001-03-23 | 2001-03-23 | Wireless unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002290270A true JP2002290270A (en) | 2002-10-04 |
Family
ID=18940493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001084887A Pending JP2002290270A (en) | 2001-03-23 | 2001-03-23 | Wireless unit |
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| Country | Link |
|---|---|
| JP (1) | JP2002290270A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016526837A (en) * | 2013-07-05 | 2016-09-05 | テレフオンアクチーボラゲット エルエム エリクソン（パブル） | Cancel spurious response from local oscillator cross coupling |
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| JPS6410734A (en) * | 1987-07-02 | 1989-01-13 | Sanyo Electric Co | Receiving device |
| JPH03210825A (en) * | 1990-01-16 | 1991-09-13 | Toshiba Corp | Superheterodyne receiver |
| JPH04351025A (en) * | 1991-05-28 | 1992-12-04 | Kokusai Electric Co Ltd | Receiver for monitoring electric field strength |
| JPH05244033A (en) * | 1992-02-26 | 1993-09-21 | Sanyo Electric Co Ltd | Dual-band radio communication device |
| JPH06125283A (en) * | 1992-10-09 | 1994-05-06 | Nippon Telegr & Teleph Corp <Ntt> | Radio communicaiton system |
| JPH09275357A (en) * | 1996-04-08 | 1997-10-21 | Matsushita Electric Ind Co Ltd | Plural-band mobile radio equipment |
| JPH11196036A (en) * | 1997-12-26 | 1999-07-21 | Matsushita Electric Ind Co Ltd | Radio terminal equipment, radio base station device and radio system using the device |
| JPH11239063A (en) * | 1998-02-20 | 1999-08-31 | Fujitsu Ltd | Hot standby radio equipment |
| JP2000269832A (en) * | 1999-03-15 | 2000-09-29 | Fujitsu Ltd | Radio transmission device, radio reception device and radio communication system |
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2001
- 2001-03-23 JP JP2001084887A patent/JP2002290270A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6410734A (en) * | 1987-07-02 | 1989-01-13 | Sanyo Electric Co | Receiving device |
| JPH03210825A (en) * | 1990-01-16 | 1991-09-13 | Toshiba Corp | Superheterodyne receiver |
| JPH04351025A (en) * | 1991-05-28 | 1992-12-04 | Kokusai Electric Co Ltd | Receiver for monitoring electric field strength |
| JPH05244033A (en) * | 1992-02-26 | 1993-09-21 | Sanyo Electric Co Ltd | Dual-band radio communication device |
| JPH06125283A (en) * | 1992-10-09 | 1994-05-06 | Nippon Telegr & Teleph Corp <Ntt> | Radio communicaiton system |
| JPH09275357A (en) * | 1996-04-08 | 1997-10-21 | Matsushita Electric Ind Co Ltd | Plural-band mobile radio equipment |
| JPH11196036A (en) * | 1997-12-26 | 1999-07-21 | Matsushita Electric Ind Co Ltd | Radio terminal equipment, radio base station device and radio system using the device |
| JPH11239063A (en) * | 1998-02-20 | 1999-08-31 | Fujitsu Ltd | Hot standby radio equipment |
| JP2000269832A (en) * | 1999-03-15 | 2000-09-29 | Fujitsu Ltd | Radio transmission device, radio reception device and radio communication system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016526837A (en) * | 2013-07-05 | 2016-09-05 | テレフオンアクチーボラゲット エルエム エリクソン（パブル） | Cancel spurious response from local oscillator cross coupling |
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