JPH0748670B2 - Mobile radio with frequency stabilization function - Google Patents
Mobile radio with frequency stabilization functionInfo
- Publication number
- JPH0748670B2 JPH0748670B2 JP62115929A JP11592987A JPH0748670B2 JP H0748670 B2 JPH0748670 B2 JP H0748670B2 JP 62115929 A JP62115929 A JP 62115929A JP 11592987 A JP11592987 A JP 11592987A JP H0748670 B2 JPH0748670 B2 JP H0748670B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- local oscillator
- receiver
- reference oscillator
- 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.)
- Expired - Fee Related
Links
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- Transceivers (AREA)
- Superheterodyne Receivers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、例えば、UHF帯の狭帯域移動通信のように、
角度変調を用い、かつ、搬送波ドリフトを極めて微小に
抑える必要のある通信方式において、自動的に搬送波周
波数を所定の値に制御する機能を有する移動無線機に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to, for example, narrow band mobile communication in the UHF band,
The present invention relates to a mobile wireless device having a function of automatically controlling a carrier frequency to a predetermined value in a communication system that uses angle modulation and that requires extremely small carrier drift.
（従来の技術） 通信方式における搬送波ドリフトは伝送品質を著しく劣
化させる。多チャネル切り換え機能を有する移動無線機
において搬送波周波数を安定化する従来技術としては、
［１］周波数弁別器のDC成分を周波数制御情報とするAF
C、［２］安定な基地局送信波を受信して、この信号を
もとに、局部発振器にPLLをかける等の技術がある。し
かしながら、これらの技術を、フェージングを伴った移
動通信特有の移動無線伝搬路において、極めて高い搬送
波周波数安定度を要求される通信方式に適用しようとす
ることは特願昭61−168004で述べたように非常な困難を
伴う。(Prior Art) Carrier wave drift in a communication system significantly deteriorates transmission quality. As a conventional technique for stabilizing a carrier frequency in a mobile radio device having a multi-channel switching function,
[1] AF that uses the DC component of the frequency discriminator as frequency control information
C, [2] There is a technique such as receiving a stable base station transmission wave and applying a PLL to a local oscillator based on this signal. However, as described in Japanese Patent Application No. 61-168004, it is attempted to apply these techniques to a communication system requiring extremely high carrier frequency stability in a mobile radio propagation path peculiar to mobile communication with fading. With great difficulty.
そこで特願昭61−168004では、これを解決するための手
段として、高安定な基地局送信波を受信し、その周波数
を正確に測定する方法を示し、特願昭61−168005におい
て、移動無線機の周波数安定度を飛躍的に向上させる手
段を提案した。第１図にその構成を示す。アンテナ1.1
より受信される安定な基地局送信波を受信機1.2で周波
数変換し、そのIF出力を雑音除去手段1.3を通過させ、
周波数カウンタ1.4で測定し、その結果が所定の値とな
るように基準発振器制御部1.5は基準発振器1.6（例え
ば、温度補償形水晶発振器（TCXO））を制御する。その
結果、TCXOを基準とする周波数シンセサイザ1.7は基地
局と同等の周波数安定度を有することとなる。また、1.
7を、変調器1.8、ミクサ1.9、電力増幅器1.10からなる
送信部で共用する移動無線機においては、移動無線機の
送信周波数安定度も安定な基地局送信周波数精度と同等
とすることができる。Therefore, in Japanese Patent Application No. 61-168004, as a means for solving this, a method of receiving a highly stable base station transmission wave and measuring its frequency accurately is shown. We proposed a means to dramatically improve the frequency stability of the machine. The structure is shown in FIG. Antenna 1.1
The frequency of the stable base station transmission wave received by the receiver 1.2 is converted, and its IF output is passed through the noise removing means 1.3.
The reference oscillator controller 1.5 controls the reference oscillator 1.6 (for example, a temperature-compensated crystal oscillator (TCXO)) so that the frequency counter 1.4 measures and the result becomes a predetermined value. As a result, the frequency synthesizer 1.7 based on TCXO has the same frequency stability as the base station. Also, 1.
In the mobile wireless device in which 7 is shared by the transmission unit including the modulator 1.8, the mixer 1.9, and the power amplifier 1.10, the transmission frequency stability of the mobile wireless device can be made equal to the stable base station transmission frequency accuracy.
（発明が解決しようとする問題点） しかしながら、移動通信においては、通常、第１局発
（通常は1.7に示すような周波数シンセサイザ）の他
に、第２局発を有するダブルコンバージョンタイプの受
信機が用いられる。このとき、第２局発における周波数
誤差が存在すると、これは第2IF帯における周波数の測
定誤差となる。例えば、第１図の構成で、周波数安定化
を行うと、第２局発の周波数誤差が存在する場合、受信
周波数を公称値に安定化することができるが、第１図の
ように送信と受信で共通の周波数シンセサイザを用いる
場合は、送信周波数は公称値より第２局発の周波数誤差
だけずれるという欠点を有していた。(Problems to be Solved by the Invention) However, in mobile communication, a double conversion type receiver having a second station in addition to the first station (usually a frequency synthesizer as shown in 1.7) is usually used. Is used. At this time, if there is a frequency error from the second station, this is a frequency measurement error in the second IF band. For example, in the configuration of FIG. 1, if frequency stabilization is performed and the frequency error originating from the second station exists, the reception frequency can be stabilized to the nominal value, but as shown in FIG. When a common frequency synthesizer is used for reception, there is a drawback that the transmission frequency deviates from the nominal value by the frequency error generated by the second station.
発明の目的は、搬送波ドリフトを極めて微小に抑える必
要のある、角度変調を用いた通信方式に供する移動無線
機において、自動的に送信搬送波周波数を所定の値に制
御する機能を有する移動無線機を提供することにある。An object of the present invention is to provide a mobile radio having a function of automatically controlling a transmission carrier frequency to a predetermined value in a mobile radio provided to a communication system using angle modulation, which requires extremely small carrier drift. To provide.
（問題点を解決するための手段） 本発明は、移動無線機の送信周波数の安定化を実現する
ために、第2IF周波数と、第２局発周波数を個別の周波
数カウンタで測定し、それぞれの計数値間で演算を施
し、公称周波数データと比較することによって、基準発
振器を制御し、送信周波数シンセサイザの周波数を安定
化することを最も大きな特徴とする。(Means for Solving Problems) The present invention measures the second IF frequency and the second station oscillation frequency by separate frequency counters and realizes stabilization of the transmission frequency of the mobile wireless device. The greatest feature is that the reference oscillator is controlled and the frequency of the transmission frequency synthesizer is stabilized by performing an operation between the count values and comparing with the nominal frequency data.
従来の技術とは、第2IF及び第２局発周波数を計数する
カウンタを個別に有することが従来技術とは異なる。It differs from the prior art in that it has a counter for counting the second IF and the second local oscillator frequency separately.
（実施例） 第２図は本発明の実施例を示す図であって、2.1は第2IF
出力を有する受信機、2.2は２系統の周波数カウンタ1.4
の出力データ間で加算あるいは減算する演算器、2.4は
比較データ2.3と演算器2.2の出力を比較する比較器、2.
5は比較器2.4の出力をもとに基準発振器1.6を制御する
回路である。(Embodiment) FIG. 2 is a diagram showing an embodiment of the present invention, in which 2.1 is the second IF.
Receiver with output, 2.2 is a dual frequency counter 1.4
An arithmetic unit that adds or subtracts between the output data of 2.4, a 2.4 comparator that compares the output of the comparison data 2.3 and the arithmetic unit 2.2, 2.
Reference numeral 5 is a circuit that controls the reference oscillator 1.6 based on the output of the comparator 2.4.
以下、本発明の動作を説明する。The operation of the present invention will be described below.
アンテナ1.1における受信周波数をFa、第１局発周波数
をFl1、第1IF周波数をFi1、第２局発周波数をFl2、第2I
F周波数をFi2とする。ここで、以下の表１の関係があ
る。The reception frequency at the antenna 1.1 is Fa, the first local oscillator frequency is Fl 1 , the first IF frequency is Fi 1 , the second local oscillator frequency is Fl 2 , and the second I
Let the F frequency be Fi 2 . Here, there is a relationship shown in Table 1 below.
上記の表よりわかるように、第2IF周波数を測定して、
第１局発周波数偏差を検出しようとすると、第２局発周
波数の誤差を補正する必要が生じる。ここで、第1IF周
波数には、第１局発周波数の誤差のみが存在することを
考慮すると、第1IF周波数を測定すれば、真の第１局発
（周波数シンセサイザ1.7）周波数の誤差を検出するこ
とができる。しかし、第1IF信号はレベルが低く、直接
周波数測定を行うことは困難である。 As you can see from the table above, measure the second IF frequency,
In order to detect the frequency deviation of the first station, it is necessary to correct the error of the frequency of the second station. Here, considering that only the error of the first local oscillator frequency exists in the first IF frequency, if the first IF frequency is measured, the error of the true first local oscillator (frequency synthesizer 1.7) frequency is detected. be able to. However, the level of the first IF signal is low, and it is difficult to directly measure the frequency.
従って、等価的に第1IF周波数を測定できれば、真の第
１局発周波数の誤差を検出することが可能となる。Therefore, if the first IF frequency can be measured equivalently, it is possible to detect the error of the true first local oscillation frequency.
表１より、第１局発周波数は第２局発周波数及び第2IF
周波数より算定が可能であり、それぞれの周波数を計数
し、それらの値を用いて演算することで、第1IF周波
数、即ち、第１局発周波数の誤差が存在する場合は、こ
れを検出することができる。From Table 1, the frequency of the first station is the frequency of the second station and the second IF
It is possible to calculate from the frequency, and by detecting each frequency and calculating using those values, if there is an error in the 1st IF frequency, that is, the 1st local oscillator frequency, detect this. You can
第２図は上記の原理を用いて、第１局発（周波数シンセ
サイザ1.7）の周波数誤差を補正する回路構成である。
なお周波数シンセサイザ自身は図示のごとく、VCOと可
変分周器と位相比較器とから構成される。演算器2.2は
それぞれ、第２局発及び第2IF周波数を計数する周波数
カウンタ出力値を加算（第２局発が下側周波数の場合）
或いは減算（第２局発が下側周波数の場合）し、第1IF
周波数を計算する。これで、第２局発周波数に誤差があ
っても、第1IF周波数（第１局発周波数に誤差がある場
合は、これが保存されている）が2.2の出力に現れる。
比較器2.4は2.2の出力と公称の第1IF周波数を表す周波
数比較データ2.3とを比較し、その結果を基準発振器制
御回路2.5に出力する。2.5は2.2と2.3を比較した結果が
零になるように基準発振器1.6を制御する。このように
して、受信機の第２局発周波数誤差をキャンセルした形
で周波数シンセサイザを公称値に較正することができ
る。FIG. 2 is a circuit configuration for correcting the frequency error of the first local oscillator (frequency synthesizer 1.7) using the above principle.
The frequency synthesizer itself is composed of a VCO, a variable frequency divider and a phase comparator as shown in the figure. The arithmetic unit 2.2 adds the frequency counter output value that counts the second local oscillator frequency and the second IF frequency (when the second local oscillator frequency is the lower frequency)
Or subtract it (when the 2nd station is lower frequency), and
Calculate the frequency. Now, even if there is an error in the second local oscillator frequency, the first IF frequency (if the first local oscillator frequency has an error, this is saved) appears in the 2.2 output.
The comparator 2.4 compares the output of 2.2 with the frequency comparison data 2.3 representing the nominal first IF frequency, and outputs the result to the reference oscillator control circuit 2.5. 2.5 controls the reference oscillator 1.6 so that the result of comparing 2.2 and 2.3 becomes zero. In this way, the frequency synthesizer can be calibrated to the nominal value with the second local oscillator frequency error of the receiver canceled.
本構成は、低消費電力のCMOSディジタルIC化が容易で小
型な周波数安定化回路を実現できる。With this configuration, a low-power CMOS digital IC can be easily realized and a compact frequency stabilization circuit can be realized.
また、本実施例は基本構成を示しており、特願昭61−16
8004に記載された応用例（周波数カウンタのタイムベー
スを、基準発振器出力を分周して得る方法等）を適用で
きることはいうまでもない。In addition, this embodiment shows a basic configuration, and is described in Japanese Patent Application No. 61-16
It goes without saying that the application example described in 8004 (method of obtaining the time base of the frequency counter by dividing the reference oscillator output, etc.) can be applied.
（発明の効果） 以上説明したように、本発明は移動無線機において、低
消費電力で、高い周波数安定度が達成できるので、イン
ターリーブチャネルを用いた移動通信方式や搬送周波数
が1GHz以上を用いる移動通信方式の移動無線機が実現で
き、その結果、移動通信方式の加入者容量を大幅に拡大
できる。(Effects of the Invention) As described above, the present invention can achieve high frequency stability with low power consumption in a mobile wireless device. Therefore, a mobile communication system using interleaved channels or a mobile communication system using a carrier frequency of 1 GHz or more is used. It is possible to realize a mobile wireless device of a communication system, and as a result, it is possible to significantly expand the subscriber capacity of the mobile communication system.
第１図は周波数安定化機能を有する従来の移動無線機で
ある。 第２図は送信周波数を安定化することのできる本発明の
実施例を示す移動無線機の構成である。 1.1…アンテナ、1.2…受信機、1.3…雑音除去手段、1.4
…周波数カウンタ、1.5…TCXO制御部、1.6…TCXO、1.7
…周波数シンセサイザ、 1.8…変調器、1.9…ミクサ、1.10…電力増幅器、2.1…
第２局発出力を有する受信機、2.2…演算器、2.3…比較
データ、2.4…比較器、2.5…基準発振器制御回路。FIG. 1 shows a conventional mobile wireless device having a frequency stabilizing function. FIG. 2 is a configuration of a mobile wireless device showing an embodiment of the present invention capable of stabilizing the transmission frequency. 1.1 ... antenna, 1.2 ... receiver, 1.3 ... noise elimination means, 1.4
… Frequency counter, 1.5… TCXO controller, 1.6… TCXO, 1.7
… Frequency synthesizer, 1.8… Modulator, 1.9… Mixer, 1.10… Power amplifier, 2.1…
Receiver having second station output, 2.2 ... arithmetic unit, 2.3 ... comparison data, 2.4 ... comparator, 2.5 ... reference oscillator control circuit.
Claims (1)
移動無線機において、第２局発信号及び第2IF信号を外
部に出力する受信機と、前記受信機の第2IF信号の雑音
を除去する雑音除去手段と、該雑音除去手段から与えら
れる第2IF信号の周波数を計数する周波数カウンタと、
第２局発周波数を計数する周波数カウンタと、前記２つ
の周波数カウンタの計数値を演算する演算器と、基準発
振器と、該基準発振器により周波数制御され第１局発信
号を前記受信機へ出力する周波数シンセサイザと、前記
演算器の出力と公称の第1IF周波数に対応する所定の値
とを比較する比較器と、該比較器の比較結果に従って前
記基準発振器を制御する基準発振器制御回路とを有し、
前記２系列の周波数カウンタの計数値から、真の周波数
シンセサイザの発振周波数ずれを検出し、これを抑圧す
ることによって、搬送波周波数の安定化を行うことを特
徴とする、周波数安定化機能を有する移動無線機。1. A mobile radio having two local oscillators using an angle modulation method, wherein a receiver for outputting a second local oscillator signal and a second IF signal to the outside and a noise of the second IF signal of the receiver Noise removing means for removing, a frequency counter for counting the frequency of the second IF signal provided from the noise removing means,
A frequency counter that counts the second local oscillator frequency, a calculator that calculates the count values of the two frequency counters, a reference oscillator, and a first local oscillator signal that is frequency-controlled by the reference oscillator and is output to the receiver. A frequency synthesizer, a comparator that compares the output of the arithmetic unit with a predetermined value corresponding to the nominal first IF frequency, and a reference oscillator control circuit that controls the reference oscillator according to the comparison result of the comparator. ,
A mobile station having a frequency stabilizing function, characterized in that the carrier frequency is stabilized by detecting the oscillation frequency shift of the true frequency synthesizer from the count values of the two series of frequency counters and suppressing it. wireless device.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62115929A JPH0748670B2 (en) | 1987-05-14 | 1987-05-14 | Mobile radio with frequency stabilization function |
| US07/072,819 US4817197A (en) | 1986-07-18 | 1987-07-13 | Mobile communication apparatus |
| DE3750757T DE3750757T2 (en) | 1986-07-18 | 1987-07-17 | Receiver arrangement for angle-modulated signals. |
| EP87306371A EP0253680B1 (en) | 1986-07-18 | 1987-07-17 | Angle modulated signal receiving apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62115929A JPH0748670B2 (en) | 1987-05-14 | 1987-05-14 | Mobile radio with frequency stabilization function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63281526A JPS63281526A (en) | 1988-11-18 |
| JPH0748670B2 true JPH0748670B2 (en) | 1995-05-24 |
Family
ID=14674684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62115929A Expired - Fee Related JPH0748670B2 (en) | 1986-07-18 | 1987-05-14 | Mobile radio with frequency stabilization function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0748670B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0744485B2 (en) * | 1987-05-22 | 1995-05-15 | 三菱電機株式会社 | Car phone equipment |
| JPH03162018A (en) * | 1989-11-20 | 1991-07-12 | Matsushita Electric Ind Co Ltd | Frequency stabilizing device |
| US5493710A (en) * | 1991-08-02 | 1996-02-20 | Hitachi, Ltd. | Communication system having oscillation frequency calibrating function |
| US5673005A (en) * | 1995-08-18 | 1997-09-30 | International Business Machine Corporation | Time standard circuit with delay line oscillator |
| JP4683032B2 (en) * | 2007-10-19 | 2011-05-11 | パナソニック株式会社 | Wireless communication device |
-
1987
- 1987-05-14 JP JP62115929A patent/JPH0748670B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63281526A (en) | 1988-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |