JPS633490B2 - - Google Patents
Info
- Publication number
- JPS633490B2 JPS633490B2 JP19677082A JP19677082A JPS633490B2 JP S633490 B2 JPS633490 B2 JP S633490B2 JP 19677082 A JP19677082 A JP 19677082A JP 19677082 A JP19677082 A JP 19677082A JP S633490 B2 JPS633490 B2 JP S633490B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- local
- local oscillation
- oscillation 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Description
【発明の詳細な説明】
本発明は、複数の送受信装置を有する無線中継
装置における受信局部発振回路に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiving local oscillation circuit in a wireless relay device having a plurality of transmitting and receiving devices.
第１図に受信周波数が1〜N、送信周波数がF1
〜FNであり、それぞれＮ台の送受信装置の間を
同一の中間周波数IFで時分割に切替接続する従
来の無線中継装置を示す。図中１―１〜１―Ｎは
信号入力端子、２―１〜２―Ｎは受信周波数変換
器（ダウンコンバータ）、３―１〜３―Ｎは受信
局部発振器、４は中間周波数IFで受信信号を時
分割的に切替接続をするマトリクススイツチ、５
―１〜５―Ｎは送信周波数変換器（アツプコンバ
ータ）、６―１〜６―Ｎは送信局部発振器、７―
１〜７―Ｎは信号出力端子である。第１図に示す
ように、従来の局部発振器は各受信装置内の周波
数変換部にそれぞれ個別に設けられていた。この
ため、１―１〜１―Ｎの信号入力端子からバース
ト状のTDMA信号（Time Division Multiple
Accsess）が入力された場合、それぞれ局部発振
器３―１〜３―Ｎの出力の周波数変動を受けた
後、マトリクススイツチ４で時分割的に配列さ
れ、周波数変換器５―１〜５―Ｎで送信周波数に
変換されて出力されることになる。従つて、従来
程度の受信局装置で復調できるようにするために
は、受信局部発振器３―１〜３―Ｎの周波数安定
度を高くしなければならないという欠点を有して
いた。 In Figure 1, the receiving frequency is 1 to N , and the transmitting frequency is F1.
˜F N , which shows a conventional wireless relay device that switches and connects N transmitting and receiving devices in a time-division manner using the same intermediate frequency IF . In the figure, 1-1 to 1-N are signal input terminals, 2-1 to 2-N are reception frequency converters (down converters), 3-1 to 3-N are reception local oscillators, and 4 is reception at intermediate frequency IF . Matrix switch that switches and connects signals in a time-division manner, 5
-1 to 5-N are transmitting frequency converters (up converters), 6-1 to 6-N are transmitting local oscillators, 7-
1 to 7-N are signal output terminals. As shown in FIG. 1, conventional local oscillators were individually provided in the frequency conversion sections in each receiving device. Therefore, burst TDMA signals (Time Division Multiple
When the outputs of the local oscillators 3-1 to 3-N are input, they are arranged in a time-divisional manner by the matrix switch 4, and then processed by the frequency converters 5-1 to 5-N. It will be converted to the transmission frequency and output. Therefore, in order to enable demodulation with conventional receiving station equipment, the frequency stability of the receiving local oscillators 3-1 to 3-N must be increased.
本発明は、この欠点を解決するため、受信局部
発振信号を共通に使用する１つの発振器の発振信
号とＭ個（Ｍ≦Ｎ）の発振器の発振信号とを混合
して作るようにした局部発振回路を提供するもの
である。 In order to solve this drawback, the present invention creates a local oscillation signal by mixing the oscillation signal of one oscillator that commonly uses the received local oscillation signal with the oscillation signals of M oscillators (M≦N). It provides a circuit.
以下図面により本発明を詳細に説明する。 The present invention will be explained in detail below with reference to the drawings.
第２図は本発明の実施例であつて、８―１〜８
―Ｎは周波数変換器、９―１〜９―Ｎは局部発振
器、１０は共通に使用する局部発振器であり、他
の記号は第１図と同じである。また、L1〜LNは
局部発振器９―１〜９―Ｎの発振周波数、Lは局
部発振器１０の発振周波数である。第２図におい
ては、例えば
i−IF＝L−Li （ｉ＝１〜Ｎ）
のような関係になるように各周波数を設定すれば
良い。一般にL≫Liであるので局部発振器の安定
度はLにより決まると考えて良い。この場合、L
は周波数変換器２―１〜２―Ｎに共通に入力され
ている。従つて、信号入力端子１―１〜１―Ｎか
ら入つたバースト信号間には、相対的な周波数変
動が生じないことになる。 FIG. 2 shows an embodiment of the present invention, 8-1 to 8
-N is a frequency converter, 9-1 to 9-N are local oscillators, 10 is a commonly used local oscillator, and other symbols are the same as in FIG. Further, L1 to LN are the oscillation frequencies of the local oscillators 9-1 to 9-N, and L is the oscillation frequency of the local oscillator 10. In FIG. 2, each frequency may be set to have a relationship such as, for example, i - IF = L - Li (i = 1 to N). Generally, L≫Li , so it can be considered that the stability of the local oscillator is determined by L. In this case, L
is commonly input to the frequency converters 2-1 to 2-N. Therefore, no relative frequency fluctuation occurs between the burst signals input from the signal input terminals 1-1 to 1-N.
第３図は本発明の別の実施例であつて
i−IF＝L±iΔ （ｉ＝１―Ｎ）
の関係を満たしている場合の実施例である。第３
図において、１１―１〜１１―Ｎは帯域通過フイ
ルタ、１２は周波数変換器、１３はΔの周波数
信号を発振する局部発振器であり、他の記号は第
１図，第２図と同じである。 FIG. 3 shows another embodiment of the present invention in which the following relationship is satisfied: i - IF = L ±iΔ (i=1-N). Third
In the figure, 11-1 to 11-N are band pass filters, 12 is a frequency converter, 13 is a local oscillator that oscillates a frequency signal of Δ, and other symbols are the same as in Figures 1 and 2. .
周波数変換器１２の出力端子には
L±nΔ （ｎ；自然数）
という周波数成分をもつ信号が出力される。そこ
で、帯域通過フイルタ１１―１〜１１―Ｎにより
必要な局発信号のみを取り出して周波数変換器２
―１〜２―Ｎへの局発信号として入力すれば同一
の中間周波数信号を得ることができる。この場合
も、局部発振器を共通化することにより、入力端
子１―１〜１―Ｎからのバースト信号間に相対的
な周波数変動が生じない。 A signal having a frequency component of L ±nΔ (n: natural number) is output to the output terminal of the frequency converter 12. Therefore, only the necessary local oscillator signals are extracted by the bandpass filters 11-1 to 11-N, and the frequency converter 2
The same intermediate frequency signal can be obtained by inputting it as a local oscillator signal to -1 to 2-N. Also in this case, by using a common local oscillator, no relative frequency fluctuation occurs between the burst signals from the input terminals 1-1 to 1-N.
以上説明したように、本発明は局部発振回路を
共通化することにより、入力信号の相対的な周波
数変動を除去することができるという利点があ
る。さらに、局部発振回路の共通化により、中継
装置全体としての小形・軽量化を図ることができ
る。 As described above, the present invention has the advantage that relative frequency fluctuations of input signals can be removed by using a common local oscillation circuit. Furthermore, by using a common local oscillation circuit, the relay device as a whole can be made smaller and lighter.
第１図は従来の無線中継装置の構成図、第２図
および第３図は本発明の実施例の構成図である。
１―１〜１―Ｎ…信号入力端子、２―１〜２―
Ｎ…受信周波数変換器、３―１〜３―Ｎ…受信局
部発振器、４…マトリクススイツチ、５―１〜５
―Ｎ…送信周波数変換器、６―１〜６―Ｎ…送信
局部発振器、７―１〜７―Ｎ…信号出力端子、８
―１〜８―Ｎ…周波数変換器、９―１〜９―Ｎ…
局部発振器、１０…共通使用の局部発振器、１１
―１〜１１―Ｎ…帯域通過フイルタ、１２…周波
数変換器、１３…局部発振器。
FIG. 1 is a block diagram of a conventional wireless relay device, and FIGS. 2 and 3 are block diagrams of an embodiment of the present invention. 1-1~1-N...Signal input terminal, 2-1~2-
N...Reception frequency converter, 3-1 to 3-N...Reception local oscillator, 4...Matrix switch, 5-1 to 5
-N...Transmission frequency converter, 6-1 to 6-N...Transmission local oscillator, 7-1 to 7-N...Signal output terminal, 8
-1~8-N...Frequency converter, 9-1~9-N...
Local oscillator, 10...Local oscillator for common use, 11
-1 to 11-N...Band pass filter, 12...Frequency converter, 13...Local oscillator.
Claims (1)
波数に変換し、各信号を時分割的に切替接続した
後、再び異なる周波数に変換して送信する無線中
継装置におけるＮ台の受信装置の局部発振回路に
おいて、共通に使用する１つの発振器の発振信号
Lと少くとも一つの他の局部発振信号から前記複
数の受信波の周波数とそれぞれ前記中間周波数だ
け異なるように周波数変換されたＭ個（Ｍ≦Ｎ）
の発振信号を各受信装置の局部発振信号として用
いることを特徴とする局部発振回路。1. Local oscillation of N receiving devices in a wireless relay device that converts multiple received waves of different frequencies to the same intermediate frequency, switches and connects each signal in a time-divisional manner, and then converts it again to a different frequency and transmits it. Oscillation signal of one oscillator commonly used in a circuit
M (M≦N) frequency-converted from L and at least one other local oscillation signal so that the frequencies of the plurality of received waves differ from each other by the intermediate frequency, respectively.
A local oscillation circuit characterized in that the oscillation signal of is used as a local oscillation signal of each receiving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19677082A JPS5986927A (en) | 1982-11-11 | 1982-11-11 | Local oscillating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19677082A JPS5986927A (en) | 1982-11-11 | 1982-11-11 | Local oscillating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5986927A JPS5986927A (en) | 1984-05-19 |
| JPS633490B2 true JPS633490B2 (en) | 1988-01-25 |
Family
ID=16363331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19677082A Granted JPS5986927A (en) | 1982-11-11 | 1982-11-11 | Local oscillating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5986927A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60208125A (en) * | 1984-03-30 | 1985-10-19 | Nec Corp | Repeater |
-
1982
- 1982-11-11 JP JP19677082A patent/JPS5986927A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5986927A (en) | 1984-05-19 |
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