JPH0431453B2 - - Google Patents
Info
- Publication number
- JPH0431453B2 JPH0431453B2 JP1672986A JP1672986A JPH0431453B2 JP H0431453 B2 JPH0431453 B2 JP H0431453B2 JP 1672986 A JP1672986 A JP 1672986A JP 1672986 A JP1672986 A JP 1672986A JP H0431453 B2 JPH0431453 B2 JP H0431453B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- fsk modulator
- transmission
- fsk
- data 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
- 238000000034 method Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 27
- 230000000694 effects Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、TDMA通信方式で１つの加入者用
無線送受信装置を複数の加入者が利用する方式に
おけるFSK変調器の安定化方法に関するもので
ある。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for stabilizing an FSK modulator in a TDMA communication system in which a single subscriber wireless transmitter/receiver is used by multiple subscribers. be.
基地局と複数の加入者とが同一周波数の電波を
時分割で使用する多方向多重無線通信方法は、周
波数を有効に使用できる経済的な加入者通信系と
して利用されている。そして近年、需要の増加に
伴つて存在する１つのビル内の多数の利用者を１
つの加入者用無線送受信装置で収容する方法が計
画されている。
A multidirectional multiplex wireless communication method in which a base station and a plurality of subscribers use radio waves of the same frequency in a time-division manner is used as an economical subscriber communication system that can use frequencies effectively. In recent years, with the increase in demand, many users in one building have become
A method is being planned in which one subscriber wireless transmitting/receiving device is required.
この方式を実現するためには、１つの無線送受
信装置の出力を分配し、また各利用者からの信号
を多重化する機能を有する装置が必要である。 In order to realize this system, a device is required that has a function of distributing the output of one wireless transmitting/receiving device and multiplexing signals from each user.
一方、加入者系に用いられる変調方式は経済性
の点からFSK変調が多く採用されているが、変
調器の動作点を安定に保つため、送信データ信号
がない時間区間、疑似ランダム信号が無線送受信
装置に入力される。 On the other hand, FSK modulation is often used as a modulation method for subscriber systems due to its economic efficiency, but in order to keep the operating point of the modulator stable, pseudo-random signals are Input to the transmitting/receiving device.
従つて、前述の各利用者の信号を多重化する装
置においても、送信データ信号のない時間区間に
FSK変調器の動作点を安定させるための信号を
入力する必要がある。 Therefore, even in the device that multiplexes the signals of each user mentioned above, the
It is necessary to input a signal to stabilize the operating point of the FSK modulator.
FSK変調器の動作点を安定させる方法として、
１つの利用者の装置（回線終端装置）からの信号
によりFSK変調器の動作点を安定させる方法が
ある。しかしながら、この方法では、該当の利用
者の装置が故障した場合にすべての加入者が影響
を受けるという欠点があり、また複数の回線終端
装置からの信号を処理する方法は複雑、高価とな
る欠点がある。
As a method to stabilize the operating point of the FSK modulator,
There is a method of stabilizing the operating point of the FSK modulator using a signal from one user's device (line termination device). However, this method has the disadvantage that all subscribers will be affected if the relevant user's equipment fails, and the method of processing signals from multiple line termination devices is complex and expensive. There is.
このような欠点を除去するために本発明は、
FSK変調器への送信データが存在しない時間区
間に無線送受信装置の受信部より抽出されたクロ
ツク信号を挿入してFSK変調器へ送信するよう
にした方法である。
In order to eliminate such drawbacks, the present invention
This is a method in which a clock signal extracted from the receiving section of a wireless transmitting/receiving device is inserted into a time period in which there is no data to be transmitted to the FSK modulator, and the clock signal is transmitted to the FSK modulator.
FSK変調器へのデータが存在しない時間区間
にはクロツク信号が挿入されて送信されるため、
FSK変調器には信号が間断なく与えられ、この
結果その動作点が安定する。
Since a clock signal is inserted and transmitted during the time period when there is no data to the FSK modulator,
The FSK modulator is fed a continuous signal, which stabilizes its operating point.
本発明に係わるTDMA用FSK変調器安定化方
法の一実施令が適用された無線送受信装置を第１
図に示す。第１図において、１は空中線、２は送
受共用器、３は周波数変換器と復調器とから成る
受信部、４はクロツク信号再生器と判定器とから
成る信号再生部、５は信号分配部、６は図示され
ていない回線終端装置と接続するためのインタフ
エース部、７は信号MUX部、８はFSK変調器、
９は送信出力を制御する高周波スイツチ、１０は
受信信号出力端子、１１は送信データ信号入力端
子、１２は送信出力制御信号入力端子である。
A wireless transmitter/receiver to which an implementation order for a TDMA FSK modulator stabilization method according to the present invention is applied is
As shown in the figure. In FIG. 1, 1 is an antenna, 2 is a duplexer, 3 is a receiving section consisting of a frequency converter and a demodulator, 4 is a signal reproducing section consisting of a clock signal regenerator and a determiner, and 5 is a signal distribution section. , 6 is an interface section for connecting to a line termination device (not shown), 7 is a signal MUX section, 8 is an FSK modulator,
9 is a high frequency switch for controlling the transmission output; 10 is a reception signal output terminal; 11 is a transmission data signal input terminal; and 12 is a transmission output control signal input terminal.
信号MUX部７は、第２図に示すように、多数
の送信データ信号入力端子TA1〜TAn、多数の
送信出力制御信号入力端子TB1〜TBn、信号再
生部４から出力されるクロツク信号を入力するた
めのクロツク信号入力端子７１、多重化された送
信データ信号を出力するための送信MUX信号出
力端子７２および各送信データ信号と対応して送
信出力を発射するためのパルスを出力する送信出
力制御信号出力端子７３の各端子を有する。 As shown in FIG. 2, the signal MUX unit 7 inputs a large number of transmission data signal input terminals TA1 to TAn, a large number of transmission output control signal input terminals TB1 to TBn, and a clock signal output from the signal reproducing unit 4. a clock signal input terminal 71 for outputting a multiplexed transmission data signal, a transmission MUX signal output terminal 72 for outputting a multiplexed transmission data signal, and a transmission output control signal for outputting a pulse for emitting a transmission output corresponding to each transmission data signal. It has each terminal of output terminal 73.
次にこのように構成された無線送受信装置の動
作について第１図〜第３図を用いて説明する。回
線終端部装置からの送信データ信号と送信出力制
御信号は、インタフエース部６を通過し、信号
MUX部７へ入力される。信号MUX部７は、第
３図ａ〜ｇに示すような入出力論理を有する構成
であり、送信MUX信号出力端子７２には各利用
者の終端装置からの送信データ信号が並び、その
送信データ信号の間はクロツク信号で埋められ
る。たとえば、第３図ｂ，ｄに示す端子TB1，
TB2上の送信出力制御信号と共に生じた第３図
ａ，ｃに示す端子TA1，TA2上の送信データ信
号の場合、送信データ信号のない時間区間TBを
生じる。この時間区間TBにおいては、第３図ｅ
に示すクロツク信号が、第３図ｆに示すように、
送信データ信号の間に挿入される。なお、第３図
ｇに示す信号は、送信出力制御信号出力端子７３
から出力される送信出力制御信号である。 Next, the operation of the wireless transmitting/receiving device configured as described above will be explained using FIGS. 1 to 3. The transmission data signal and transmission output control signal from the line termination device pass through the interface section 6, and the signal
The signal is input to the MUX section 7. The signal MUX unit 7 has an input/output logic as shown in FIG. The gaps between the signals are filled with clock signals. For example, the terminal TB1 shown in Fig. 3b, d,
In the case of a transmitted data signal on the terminals TA1, TA2 shown in FIG. 3a, c occurring together with a transmitted power control signal on TB2, a time interval TB occurs in which there is no transmitted data signal. In this time interval TB, Fig. 3 e
As shown in FIG. 3f, the clock signal shown in FIG.
Inserted between transmitted data signals. Note that the signal shown in FIG. 3g is transmitted from the transmission output control signal output terminal 73.
This is a transmission output control signal output from.
すなわち、送信MUX部７から送出されるデー
タ信号は、通常、図示しないコンデンサを介して
FSK変調器８へ出力されており、データ信号が
連続してFSK変調器８へ送出されていれば、
FSK変調器８の動作点は変動しないが、データ
信号の存在しない時間区間TBが生じてこの区間
TBの後に次のデータ信号が送出された場合は、
上記コンデンサの直流遮断特性が十分ではないこ
とから、その送出直後のデータ信号の直流成分が
FSK変調器８側へ漏れ、この結果FSK変調器８
の直流バイアス点、つまり動作点が変動し、
FSK変調器８が安定に動作しなくなる。このた
め、時間区間TBにおいてクロツク信号を挿入す
ることにより、このクロツク信号とデータ信号と
を一連の信号としてFSK変調器８へ与え、FSK
変調器８の動作点の変動を抑制するようにしたも
のである。 In other words, the data signal sent from the transmission MUX section 7 is normally transmitted via a capacitor (not shown).
If the data signal is output to the FSK modulator 8 and the data signal is continuously sent to the FSK modulator 8,
Although the operating point of the FSK modulator 8 does not change, there is a time interval TB where no data signal exists, and this interval
If the next data signal is sent after TB,
Since the DC cutoff characteristics of the above capacitor are not sufficient, the DC component of the data signal immediately after being sent out is
Leakage to the FSK modulator 8 side, resulting in FSK modulator 8
The DC bias point, or operating point, of
FSK modulator 8 no longer operates stably. Therefore, by inserting a clock signal in the time interval TB, this clock signal and data signal are supplied as a series of signals to the FSK modulator 8, and the FSK
This is intended to suppress fluctuations in the operating point of the modulator 8.
このようにして送信MUX信号は、信号のない
時間区間のない信号として送信MUX信号出力端
子７２からFSK変調器８へ出力され、FSK変調
器８の動作を安定なものとする。FSK変調器８
に入力された送信MUX信号は、変調された後、
高周波スイツチ９で送信出力を制御され、空中線
１から電波となつて発射される。 In this way, the transmission MUX signal is outputted from the transmission MUX signal output terminal 72 to the FSK modulator 8 as a signal without a time period in which no signal exists, thereby stabilizing the operation of the FSK modulator 8. FSK modulator 8
After the transmitting MUX signal input to is modulated,
The transmission output is controlled by a high frequency switch 9, and the radio waves are emitted from the antenna 1 as radio waves.
FSK変調器への送信データ信号が存在しない
時間区間に加入者用無線送受信装置の受信部より
抽出したクロツク信号を挿入して送信するように
したので、FSK変調器には信号が間断なく与え
られ、この結果FSK変調器の動作点を安定に保
つ効果がある。
Since the clock signal extracted from the receiver of the subscriber radio transmitter/receiver is inserted into the time period when there is no transmission data signal to the FSK modulator, the signal is continuously provided to the FSK modulator. , this has the effect of keeping the operating point of the FSK modulator stable.
第１図は本発明に係わるTDMA用FSK変調器
安定化方法の一実施例が適用された無線送受信装
置を示す系統図、第２図はその無線送受信装置を
構成する信号MUX部を示す構成図、第３図はそ
の無線送受信装置の動作を説明するためのタイム
チヤートである。
１……空中線、２……送受共用器、３……受信
部、４……信号再生部、５……信号分配部、６…
…インタフエース部、７……信号MUX部、８…
…FSK変調器、９……高周波スイツチ、１０…
…受信信号出力端子、１１……送信データ信号入
力端子、１２……送信出力制御信号入力端子、
TA１〜TAn……送信データ信号入力端子、TB
１〜TBn……送信出力制御信号入力端子、７１
……クロツク信号入力端子、７２……送信MUX
信号出力端子、７３……送信出力制御信号出力端
子。
FIG. 1 is a system diagram showing a wireless transmitting/receiving device to which an embodiment of the TDMA FSK modulator stabilization method according to the present invention is applied, and FIG. 2 is a configuration diagram showing a signal MUX section constituting the wireless transmitting/receiving device. , FIG. 3 is a time chart for explaining the operation of the wireless transmitter/receiver. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Transmission/reception duplexer, 3... Receiving section, 4... Signal reproducing section, 5... Signal distribution section, 6...
...Interface section, 7...Signal MUX section, 8...
...FSK modulator, 9...High frequency switch, 10...
... Reception signal output terminal, 11 ... Transmission data signal input terminal, 12 ... Transmission output control signal input terminal,
TA1~TAn...Transmission data signal input terminal, TB
1~TBn...Transmission output control signal input terminal, 71
...Clock signal input terminal, 72...Transmission MUX
Signal output terminal, 73... Transmission output control signal output terminal.
Claims (1)
信装置を複数の加入者が利用する方式における
FSK変調器安定化方法において、FSK変調器へ
送信するデータが存在しない時間区間に前記無線
送受信装置の受信部より抽出されたクロツク信号
を挿入して送信することによりFSK変調器の動
作点を安定化することを特徴とするTDMA用
FSK変調器安定化方法。1 In a TDMA communication system where one subscriber wireless transmitter/receiver is used by multiple subscribers
In the FSK modulator stabilization method, the operating point of the FSK modulator is stabilized by inserting and transmitting a clock signal extracted from the receiving section of the wireless transmitting/receiving device during a time period in which there is no data to be transmitted to the FSK modulator. For TDMA, which is characterized by
FSK modulator stabilization method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1672986A JPS62176243A (en) | 1986-01-30 | 1986-01-30 | Fsk modulator stabilizing method for tdma |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1672986A JPS62176243A (en) | 1986-01-30 | 1986-01-30 | Fsk modulator stabilizing method for tdma |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62176243A JPS62176243A (en) | 1987-08-03 |
| JPH0431453B2 true JPH0431453B2 (en) | 1992-05-26 |
Family
ID=11924349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1672986A Granted JPS62176243A (en) | 1986-01-30 | 1986-01-30 | Fsk modulator stabilizing method for tdma |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62176243A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030108122A1 (en) * | 2001-02-09 | 2003-06-12 | Hirochika Hiraki | Digital modulation system, radio communication system, radio communication device |
| WO2002065724A1 (en) * | 2001-02-13 | 2002-08-22 | Mitsubishi Denki Kabushiki Kaisha | Multiple-level modulating method, multiple-level demodulating method, and multiple-level modulating/demodulating method |
-
1986
- 1986-01-30 JP JP1672986A patent/JPS62176243A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62176243A (en) | 1987-08-03 |
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