JPH0340980B2 - - Google Patents
Info
- Publication number
- JPH0340980B2 JPH0340980B2 JP59008439A JP843984A JPH0340980B2 JP H0340980 B2 JPH0340980 B2 JP H0340980B2 JP 59008439 A JP59008439 A JP 59008439A JP 843984 A JP843984 A JP 843984A JP H0340980 B2 JPH0340980 B2 JP H0340980B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- mobile station
- section
- radio
- deviation signal
- 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 - Lifetime
Links
- 238000010586 diagram Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は移動局と基地局とを有する無線通信シ
ステムに関し、特にハンデイ無線や車載無線シス
テムの周波数調整方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a wireless communication system having a mobile station and a base station, and more particularly to a frequency adjustment method for a handy radio or a vehicle-mounted radio system.
従来、この種の無線通信システムにおいては、
移動局には固有の周波数帯がわりふられており、
移動局では他の移動局との混信等を避けるため、
周波数安定度の高い水晶発振器が使用されてい
る。しかしながら、長期間には水晶発振器に使用
されている水晶発振子の経時的変化により、発振
周波数が変化することは避けられない。
Conventionally, in this type of wireless communication system,
Each mobile station is assigned a unique frequency band.
At the mobile station, to avoid interference with other mobile stations,
A crystal oscillator with high frequency stability is used. However, over a long period of time, it is inevitable that the oscillation frequency will change due to changes over time in the crystal oscillator used in the crystal oscillator.
一例として、12MHz帯ATカツト水晶振動子の
場合、±２×10-6／年の周波数変化が検出された
例がある。このため、システム上高い周波数安定
度が要求される場合には、定期的に移動局の発振
器周波数を再調整する必要がある。例えば、車載
型移動局の場合には、定期的にサービス会社に移
動局としての無線機を持ち込み、調整を行う必要
がある。しかしながら、このような方法は日数も
かかり経済的でない。 As an example, in the case of a 12MHz band AT-cut crystal resonator, a frequency change of ±2×10 −6 /year was detected. Therefore, if high frequency stability is required for the system, it is necessary to readjust the oscillator frequency of the mobile station periodically. For example, in the case of a vehicle-mounted mobile station, it is necessary to periodically bring the radio as a mobile station to a service company and make adjustments. However, such a method takes many days and is not economical.
本発明は、このような欠点を解消した無線機の
周波数調整システムを提供しようとするものであ
る。
The present invention aims to provide a frequency adjustment system for radio equipment that eliminates such drawbacks.
本発明は、基地局において移動局からの無線周
波数信号を受信すると、基地局内部の基準周波数
と比較して周波数偏差を検出し、この周波数偏差
を基地局より該当する移動局にフイードバツクし
て移動局の無線周波数を調整することを調整す
る。
In the present invention, when a base station receives a radio frequency signal from a mobile station, it compares it with a reference frequency inside the base station, detects a frequency deviation, and feeds this frequency deviation from the base station to the corresponding mobile station. Adjust to adjust the station's radio frequency.
以下に本発明の実施例を説明する。 Examples of the present invention will be described below.
第１図は本発明の基地局における要部の概略構
成例をブロツク図で示す。１は移動局からの電波
を受信する受信部、２は周波数比較部、３は基準
周波数発生部であり、周波数比較部２、基準周波
数発生部３は移動局に対応して設置される。４は
比較部２で得られた周波数偏差信号を送信に適し
た信号に処理して該当する移動局へ送るための送
信部であり、周波数偏差信号の送信は通話時に行
われる。 FIG. 1 is a block diagram showing an example of a schematic configuration of essential parts of a base station according to the present invention. 1 is a receiving section that receives radio waves from a mobile station, 2 is a frequency comparison section, and 3 is a reference frequency generation section.The frequency comparison section 2 and the reference frequency generation section 3 are installed corresponding to the mobile station. Reference numeral 4 denotes a transmitter for processing the frequency deviation signal obtained by the comparator 2 into a signal suitable for transmission and sending it to the corresponding mobile station, and the frequency deviation signal is transmitted during a call.
第２図は本発明の移動局における要部の概略構
成例をブロツク図で示す。５は基地局からの電波
を受信する受信部、６は受信信号に含まれる周波
数偏差信号にもとづいて内部発振器７の周波数誤
差を修正する周波数調整部である。周波数調整部
６における調整は、手動あるいは自動で行うこと
ができる。 FIG. 2 is a block diagram showing an example of a schematic configuration of the main parts of a mobile station according to the present invention. 5 is a receiving section that receives radio waves from a base station, and 6 is a frequency adjusting section that corrects the frequency error of the internal oscillator 7 based on a frequency deviation signal included in the received signal. Adjustment in the frequency adjustment section 6 can be performed manually or automatically.
はじめに、手動で行う場合について説明する。 First, we will explain how to do it manually.
周波数調整部６として、例えば第３図に示す如
く、移動局としての無線機１０の前面に周波数偏
差信号のレベル表示計１１を設け、またつまみ１
２によつて内部発振器の周波数を調節する構造と
することにより、ユーザは基地局と通話しながら
レベル表示計１１を見て周波数調整を行うことが
できる。すなわち、移動局の内部発振器を第４図
に示すような構成とし、可変容量コンデンサ２８
の容量をつまみで調整できるようにすることによ
り、周波数調整が可能となる。第４図において、
２１はトランジスタ、２２は水晶発振子である。
なお、可変容量コンデンサ２８の回転部のシヤフ
トを無線機筺体の前面に出すことにより、前面操
作可能となることは言うまでも無い。 As the frequency adjustment section 6, for example, as shown in FIG.
By adjusting the frequency of the internal oscillator using 2, the user can adjust the frequency by looking at the level indicator 11 while talking to the base station. That is, the internal oscillator of the mobile station is configured as shown in FIG. 4, and the variable capacitor 28
The frequency can be adjusted by adjusting the capacity with a knob. In Figure 4,
21 is a transistor, and 22 is a crystal oscillator.
It goes without saying that by exposing the shaft of the rotating portion of the variable capacitor 28 to the front of the radio device housing, it becomes possible to operate the variable capacitor 28 from the front.
また、内部発振器として、第５図に示す如く、
上述の可変容量コンデンサの代わりに可変容量ダ
イオード４８と可変抵抗器５４とを用いた場合に
は、可変抵抗器５４の回転部のシヤフトを利用し
て上述同様に無線機の前面操作が可能である。 In addition, as an internal oscillator, as shown in FIG.
When a variable capacitance diode 48 and a variable resistor 54 are used instead of the variable capacitor described above, the front surface of the radio can be operated in the same way as described above using the shaft of the rotating part of the variable resistor 54. .
次に、周波数調整を自動的に行う場合について
説明する。 Next, a case where frequency adjustment is automatically performed will be described.
この場合、第２図の周波数調整部６として受信
部５からの周波数偏差信号を電圧信号に変換する
電圧制御部を用いる。すなわち、受信部からの周
波数偏差信号は、周波数偏差が正であるか負であ
るかに応じて電圧制御部で正あるいは負の電圧信
号に変換される。そして、この電圧信号で内部発
振器の周波数制御が行われる。勿論、この場合に
は、内部発振器として電圧制御型発振器が使用さ
れ、通話毎に周波数偏差に応じてこれを０にする
ような周波数制御が行われる。 In this case, a voltage control section that converts the frequency deviation signal from the reception section 5 into a voltage signal is used as the frequency adjustment section 6 in FIG. 2. That is, the frequency deviation signal from the receiving section is converted into a positive or negative voltage signal by the voltage control section depending on whether the frequency deviation is positive or negative. Then, frequency control of the internal oscillator is performed using this voltage signal. Of course, in this case, a voltage-controlled oscillator is used as the internal oscillator, and frequency control is performed to set it to 0 depending on the frequency deviation for each call.
以上説明してきたように、本発明によれば移動
局における発振周波数が変動しても容易に基準周
波数に戻すことができ、このことにより高い周波
数安定度が要求されるような無線通信システムに
最適な混信の無い無線通信が実現できる。
As explained above, according to the present invention, even if the oscillation frequency in a mobile station fluctuates, it can be easily returned to the reference frequency, making it ideal for wireless communication systems that require high frequency stability. Wireless communication without interference can be achieved.
第１図は本発明の基地局における要部の概略構
成図、第２図は本発明の移動局における要部の概
略構成図、第３図は本発明の移動局としての無線
機の外観図、第４図は本発明に使用される移動局
の内部発振器回路の一例を示した図、第５図は内
部発振器回路の他の例を示した図。
１は受信部、２は周波数比較部、３は基準周波
数発生部、４は送信部、５は受信部、６は周波数
調整部、１０は無線機。
FIG. 1 is a schematic diagram of the main parts of a base station of the present invention, FIG. 2 is a schematic diagram of the main parts of a mobile station of the invention, and FIG. 3 is an external view of a radio device as a mobile station of the invention. , FIG. 4 is a diagram showing an example of an internal oscillator circuit of a mobile station used in the present invention, and FIG. 5 is a diagram showing another example of the internal oscillator circuit. 1 is a receiving section, 2 is a frequency comparing section, 3 is a reference frequency generating section, 4 is a transmitting section, 5 is a receiving section, 6 is a frequency adjusting section, and 10 is a radio device.
Claims (1)
において、前記基地局は、前記移動局からの無線
周波数信号を受信すると該無線周波数を基準周波
数と比較して周波数偏差信号を出力する比較部を
有して該周波数偏差信号を前記移動局に送信し、
前記移動局には、前記周波数偏差信号を受信する
と該周波数偏差信号に応じて該移動局の発振器の
周波数を調整する周波数調整部を備えたことを特
徴とする無線機の周波数調整システム。1. In a wireless communication system having a mobile station and a base station, the base station includes a comparison unit that, upon receiving a radio frequency signal from the mobile station, compares the radio frequency with a reference frequency and outputs a frequency deviation signal. and transmitting the frequency deviation signal to the mobile station,
A frequency adjustment system for a wireless device, wherein the mobile station includes a frequency adjustment section that adjusts the frequency of an oscillator of the mobile station in accordance with the frequency deviation signal upon receiving the frequency deviation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59008439A JPS60153232A (en) | 1984-01-23 | 1984-01-23 | Frequency adjusting system of radio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59008439A JPS60153232A (en) | 1984-01-23 | 1984-01-23 | Frequency adjusting system of radio equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60153232A JPS60153232A (en) | 1985-08-12 |
| JPH0340980B2 true JPH0340980B2 (en) | 1991-06-20 |
Family
ID=11693157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59008439A Granted JPS60153232A (en) | 1984-01-23 | 1984-01-23 | Frequency adjusting system of radio equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60153232A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5830242A (en) * | 1981-08-18 | 1983-02-22 | Nippon Telegr & Teleph Corp <Ntt> | Mobile radio communication system |
-
1984
- 1984-01-23 JP JP59008439A patent/JPS60153232A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5830242A (en) * | 1981-08-18 | 1983-02-22 | Nippon Telegr & Teleph Corp <Ntt> | Mobile radio communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60153232A (en) | 1985-08-12 |
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