JP2000216723A - Radio equipment - Google Patents

Radio equipment

Info

Publication number
JP2000216723A
JP2000216723A JP11017153A JP1715399A JP2000216723A JP 2000216723 A JP2000216723 A JP 2000216723A JP 11017153 A JP11017153 A JP 11017153A JP 1715399 A JP1715399 A JP 1715399A JP 2000216723 A JP2000216723 A JP 2000216723A
Authority
JP
Japan
Prior art keywords
transmission
signal
switching
modulation
information
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.)
Pending
Application number
JP11017153A
Other languages
Japanese (ja)
Inventor
Koichi Kasada
浩一 笠田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11017153A priority Critical patent/JP2000216723A/en
Publication of JP2000216723A publication Critical patent/JP2000216723A/en
Pending legal-status Critical Current

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  • Communication Control (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PROBLEM TO BE SOLVED: To increase transmission capacity without deteriorating transmission by detecting a period, when communication quality is satisfactory according to the intensity of a signal exchanged between the radio equipment of an automobile side and the radio equipment of a base station side and selecting a modulation and demodulation system, in which transmission capacity can be taken large in the period. SOLUTION: Related to radio equipment 13, a modulator selection processor 13b decides the switching of modulation systems on the basis of signal strength from corresponding radio equipment 14, which is detected by a signal strength detector 13a. A modulator 13d, having plural modulation systems whose transmission capacities are different modulates a transmission signal according to the decision, and a switching signal transmitter 13c, transmits switching information for modulation systems to the equipment 14. For the equipment 14, a demodulator selection processor 14f switches demodulation systems of a demodulator 14g corresponding to the plural modulation systems, whose transmission capacities are different on the basis of the switching information. Thus, an automobile 1 and a base station 6 are well adapted to the state of a transmission line and can transmit a large amount of information in unit time.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、自動車電話シス
テムなどに用いられる無線機の改良に関し、単位時間内
に多くの情報を伝送する機能を有する無線機を提案する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a radio used in a car telephone system and the like, and proposes a radio having a function of transmitting a large amount of information in a unit time.

【0002】[0002]

【従来の技術】まず、この種の無線機について従来例を
説明する。図3は自動車電話システムの例を示すもの
で、図において1は自動車、2は無線機としての自動車
電話機であって、それには送受信アンテナ3が取り付け
られている。4は前記無線機2につながっているデータ
端末であって、例えば営業情報などを取り扱うものであ
れば、客先関連情報を入力し処理する。このデータ端末
4で処理された情報は、前記無線機2を介して後述する
自社に送られる。5は前記送受信アンテナ3から自動車
電話システムを構成する基地局6の送受信アンテナ7へ
受信される電波であって、ここでは上り回線とする。8
は前記基地局6の送受信アンテナ7から自動車側へ送信
される電波であって、ここでは下り回線とする。9は前
記基地局6の無線機であって、前記送受信アンテナ7に
つながっている。10は自社であって、前記基地局6と
は通信回線11によってつながっている。12は自社内
のデータ端末であって前記データ端末4と情報の授受を
行う。
2. Description of the Related Art First, a conventional example of this type of radio will be described. FIG. 3 shows an example of a car telephone system. In the figure, reference numeral 1 denotes a car, and 2 denotes a car telephone as a radio, to which a transmitting / receiving antenna 3 is attached. Numeral 4 denotes a data terminal connected to the wireless device 2, and if it handles, for example, business information, inputs and processes customer related information. The information processed by the data terminal 4 is sent to the company described later via the wireless device 2. Numeral 5 is a radio wave received from the transmission / reception antenna 3 to the transmission / reception antenna 7 of the base station 6 constituting the mobile telephone system. 8
Is a radio wave transmitted from the transmission / reception antenna 7 of the base station 6 to the automobile side, and is assumed to be a downlink here. Reference numeral 9 denotes a wireless device of the base station 6, which is connected to the transmitting / receiving antenna 7. Reference numeral 10 denotes a company, which is connected to the base station 6 by a communication line 11. Reference numeral 12 denotes an in-house data terminal for exchanging information with the data terminal 4.

【0003】次にこのようなシステムのハードウェア構
成におけるその動作を具体的に説明する。図4は、前記
データ端末4と前記データ端末12とのつながりを前記
無線機2及び前記無線機9を介して示したものである。
なお、ここでは図3で示した部分以外について説明す
る。2aは前記無線機2の構成品である変調器であっ
て、前記データ端末4で処理された情報Da1に変調を
かける。同じく2bは前記無線機2の構成品である送信
信号電力増幅器であって、前記変調器2aで変調された
送信信号Da2を電波として送信するための電力増幅を
行うものである。前記送信信号電力増幅器2bで電力増
幅された高周波送信信号Da3は前記送受信アンテナ3
から前記基地局6へ送信され、前記上り回線5の電波と
して前記送受信アンテナ7で受信される。9cは前記無
線機9の構成品である高周波受信信号電力増幅器であっ
て、送受信アンテナ7で受信された電波Da4を電力増
幅するものである。同じく9dは復調器であって、前記
高周波受信信号電力増幅器9cで増幅された受信信号D
a5をとりだし、前記変調器2aで変調された信号Da
2を復調するものである。復調された情報Da6は前記
通信回線11を介し前記データ端末12へ送られ、前記
自動車1側から前記自社10側へ向けてのデータ伝送が
完了する。また、9aは前記無線機9の構成品である変
調器であって、前記データ端末12で処理された情報D
b1に変調をかける。同じく9bは前記無線機9の構成
品である送信信号電力増幅器であって、前記変調器9a
で変調された送信信号Db2を電波として送信するため
の電力増幅を行うものである。前記送信信号電力増幅器
9bで電力増幅された高周波送信信号Db3は前記送受
信アンテナ7から前記自動車1へ送信され、前記下り回
線8の電波として前記送受信アンテナ3で受信される。
2cは前記無線機2の構成品である高周波受信信号電力
増幅器であって、送受信アンテナ3で受信された電波D
b4を電力増幅するものである。同じく2dは復調器で
あって、前記高周波受信信号電力増幅器2cで増幅され
た受信信号Db5をとりだし、前記変調器9aで変調さ
れた信号Db2を復調するものである。復調された情報
Db6は前記データ端末4へ送られ、前記自社10側か
ら前記自動車1側へ向けてのデータ伝送が完了する。
Next, the operation of the hardware configuration of such a system will be specifically described. FIG. 4 shows the connection between the data terminal 4 and the data terminal 12 via the wireless device 2 and the wireless device 9.
Here, the portions other than those shown in FIG. 3 will be described. A modulator 2a is a component of the wireless device 2, and modulates information Da1 processed by the data terminal 4. Similarly, reference numeral 2b denotes a transmission signal power amplifier which is a component of the wireless device 2, and performs power amplification for transmitting the transmission signal Da2 modulated by the modulator 2a as radio waves. The high-frequency transmission signal Da3 power-amplified by the transmission signal power amplifier 2b is
To the base station 6 and received by the transmitting / receiving antenna 7 as radio waves of the uplink 5. Reference numeral 9c denotes a high-frequency reception signal power amplifier, which is a component of the wireless device 9, for power-amplifying the radio wave Da4 received by the transmission / reception antenna 7. Similarly, 9d is a demodulator, which is a received signal D amplified by the high frequency received signal power amplifier 9c.
a5, and a signal Da modulated by the modulator 2a
2 is demodulated. The demodulated information Da6 is sent to the data terminal 12 via the communication line 11, and the data transmission from the automobile 1 to the company 10 is completed. Reference numeral 9a denotes a modulator, which is a component of the wireless device 9, and information D processed by the data terminal 12.
Modulate b1. Reference numeral 9b denotes a transmission signal power amplifier which is a component of the wireless device 9, and the modulator 9a
The power amplification is performed to transmit the transmission signal Db2 modulated by the above as a radio wave. The high-frequency transmission signal Db3 power-amplified by the transmission signal power amplifier 9b is transmitted from the transmission / reception antenna 7 to the automobile 1, and received by the transmission / reception antenna 3 as a radio wave of the downlink 8.
Reference numeral 2c denotes a high-frequency reception signal power amplifier, which is a component of the wireless device 2, and a radio wave D received by the transmission / reception antenna 3.
b4 is to amplify the power. Similarly, reference numeral 2d denotes a demodulator which takes out the reception signal Db5 amplified by the high-frequency reception signal power amplifier 2c and demodulates the signal Db2 modulated by the modulator 9a. The demodulated information Db6 is sent to the data terminal 4, and data transmission from the company 10 to the automobile 1 is completed.

【0004】[0004]

【発明が解決しようとする課題】従来の無線機では、単
一の変復調方式が採用されていて、かつ伝送路の伝送状
態による通信品質の変動に対し、通信品質が最も劣化し
た場合の通達性能を基準として設計がなされていたため
に、伝送容量の変化に対して余裕が少なかった。したが
って、単位時間内に多くの情報を伝送しづらいという問
題点があった。
In a conventional radio, a single modulation / demodulation method is employed, and the notification performance when the communication quality is most deteriorated with respect to the fluctuation of the communication quality due to the transmission state of the transmission line. Therefore, there is little margin for a change in transmission capacity because the design is made based on the above. Therefore, there is a problem that it is difficult to transmit a lot of information in a unit time.

【0005】[0005]

【課題を解決するための手段】この発明は上記のような
課題を解決するためになされたもので、自動車側の無線
機と、基地局側の無線機との間でやりとりされる信号の
強度により通信品質が良好な期間を検出し、その期間に
おいて伝送容量が大きくとれる変復調方式を選択し、単
位時間内に多くの情報を伝送するものである。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for transmitting and receiving signals between a radio device on a vehicle and a radio device on a base station. , A period in which the communication quality is good is detected, a modulation / demodulation method capable of obtaining a large transmission capacity in that period is selected, and a large amount of information is transmitted within a unit time.

【0006】[0006]

【発明の実施の形態】実施の形態1.図1はこの実施の
形態1を示す図であり、図において13及び14はこの
発明の無線機であり、両者が同一構成のであるため13
を例に構成を説明する。13aは信号強度検出器であっ
て、対向する無線機14からの信号の強度を検出するも
のである。13bは変調器選択処理器であって、前記信
号強度検出器13aで検出した信号の強度に基づき変調
方式の切り換えを判断するものである。13cは切換信
号送信器であって、前記変調器選択処理器13bで判断
された変調方式の切換情報を伝送するものである。13
dは伝送容量が異なる複数の変調方式をもつ変調器であ
って、前記データ端末4で処理された情報と前記切換信
号送信器13cで切換情報を前記変調器選択処理器13
bで判断された変調方式で変調するものである。13e
は切換信号検出器であって、対応する無線機14の切換
信号送信器14cにより伝送された切換情報を検出する
ものである。13fは復調器選択処理器であって、前記
切換信号検出器13eにより検出された切換情報に基づ
き復調方式の切換を行うものである。13gは伝送容量
が異なる複数の変調方式に対応した復調器であって、前
記高周波受信信号電力増幅器9cで増幅された受信信号
をとりだし、対向する無線機14の伝送容量が異なる複
数の変調方式をもつ変調器14dで変調された信号を復
調するものである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing the first embodiment. In the drawing, reference numerals 13 and 14 denote radio devices of the present invention, which have the same configuration.
The configuration will be described as an example. Reference numeral 13a denotes a signal strength detector which detects the strength of a signal from the wireless device 14 facing the signal strength detector. Reference numeral 13b denotes a modulator selection processor which determines the switching of the modulation method based on the signal strength detected by the signal strength detector 13a. A switching signal transmitter 13c transmits switching information of the modulation method determined by the modulator selection processor 13b. 13
d is a modulator having a plurality of modulation schemes having different transmission capacities. The information processed by the data terminal 4 and the switching information by the switching signal transmitter 13c are converted by the modulator selection processor 13c.
The modulation is performed by the modulation method determined in b. 13e
Is a switching signal detector for detecting the switching information transmitted by the switching signal transmitter 14c of the corresponding wireless device 14. A demodulator selection processor 13f switches the demodulation method based on the switching information detected by the switching signal detector 13e. 13g is a demodulator corresponding to a plurality of modulation schemes having different transmission capacities. The demodulator 13g extracts a reception signal amplified by the high-frequency reception signal power amplifier 9c and converts the plurality of modulation schemes having different transmission capacities of the radio unit 14 facing each other. And demodulates the signal modulated by the modulator 14d.

【0007】次にこのようなシステムのハードウェア構
成におけるその動作を具体的に説明する。図において、
ます、送信開始時、前記伝送容量が異なる複数の変調方
式をもつ変調器13dと前記伝送容量が異なる複数の変
調方式に対応した復調器14g、前記伝送容量が異なる
複数の変調方式をもつ変調器14dと前記伝送容量が異
なる複数の変調方式に対応した復調器13gはそれぞれ
変復調可能な変復調方式を設定する。
Next, the operation of the hardware configuration of such a system will be specifically described. In the figure,
First, at the start of transmission, a modulator 13d having a plurality of modulation schemes having different transmission capacities, a demodulator 14g corresponding to a plurality of modulation schemes having different transmission capacities, and a modulator having a plurality of modulation schemes having different transmission capacities. A demodulator 13g corresponding to 14d and a plurality of modulation schemes having different transmission capacities each set a modulation / demodulation scheme capable of modulation / demodulation.

【0008】送信開始後、伝送路の伝送状態により信号
の強度は変動する。このとき、前記信号強度検出器13
aは前記送受信アンテナ3の受信信号から得られる検出
信号Sa1あるいは前記伝送容量が異なる複数の変調方
式に対応した復調器13gの受信信号Sa2により信号
の強度を検出する。前記変調器選択処理器13bは前記
信号強度検出器13aにより検出された信号の強度Sa
3から前記データ端末4で処理された情報Sa4の変調
方式を選択する選択信号Sa5を送出する。このとき、
伝送路の伝送状態が良好な場合は伝送容量の大きな変調
方式に、不良な場合は小さな変調方式に切り換えるもの
とする。また、前記切換信号送信器13cは切換情報S
a6(前記変調器選択処理器13bにより選択した変調
方式の情報と切換タイミングの情報)を送信する。前記
伝送容量が異なる複数の変調方式をもつ変調器13dは
前記データ端末4で処理された情報Sa4と前記切換信
号送信器13cで送信された切換情報Sa6に変調をか
ける。前記送信信号電力増幅器2bは前記伝送容量が異
なる複数の変調方式をもつ変調器13dで変調された送
信信号Sa7を電波として送信するための電力増幅を行
うものである。前記送信信号電力増幅器2bで電力増幅
された高周波送信信号Sa8は前記送受信アンテナ3か
ら前記基地局6へ送信され、前記上り回線5の電波とし
て前記送受信アンテナ7で受信される。前記高周波受信
信号電力増幅器9cは送受信アンテナ7で受信された電
波Sa9を電力増幅するものである。前記伝送容量が異
なる複数の変調方式に対応した復調器14gは前記高周
波受信信号電力増幅器9cで増幅された受信信号Sa1
0をとりだし、前記伝送容量が異なる複数の変調方式を
もつ変調器13dで変調された信号Sa7を復調するも
のである。前記切換信号検出器14eは前記切換信号送
信器13cで送信された切換情報Sa6(前記変調器選
択処理器13bにより選択した変調方式の情報と切換タ
イミングの情報)を検出するものである。前記復調器選
択処理器14fは前記切換信号検出器14eで検出され
た切換情報Sa6により復調器を選択するものである。
ここで、前記切換情報Sa6にある切換タイミングにな
ると前記伝送容量が異なる複数の変調方式をもつ変調器
13dと前記伝送容量が異なる複数の変調方式に対応し
た復調器14gが前記切換情報Sa6にある変復調方式
に切り換わり、復調された情報Sa11は前記通信回線
11を介し前記データ端末12へ送られ、前記自動車1
側から前記自社10側へ向けての伝送路の伝送状態に応
じたデータ伝送が提供される。また、前記信号強度検出
器14aは前記送受信アンテナ7の受信信号から得られ
る検出信号Sb1あるいは前記伝送容量が異なる複数の
変調方式に対応した復調器14gの受信信号Sb2によ
り信号の強度を検出する。前記変調器選択処理器14b
は前記信号強度検出器14aにより検出された信号の強
度Sb3から前記データ端末12で処理された情報Sb
4の変調方式を選択する選択信号Sb5を送出する。こ
のとき、伝送路の伝送状態が良好な場合は伝送容量の大
きな変調方式に、不良な場合は小さな変調方式に切り換
えるものとする。また、前記切換信号送信器14cは切
換情報Sb6(前記変調器選択処理器14bにより選択
した変調方式の情報と切換タイミングの情報)を送信す
る。前記伝送容量が異なる複数の変調方式をもつ変調器
14dは前記データ端末12で処理された情報Sb4と
前記切換信号送信器14cで送信された切換情報Sb6
に変調をかける。戦記送信信号電力増幅器9bは前記伝
送容量が異なる複数の変調方式をもつ変調器14dで変
調された送信信号Sb7を電波として送信するための電
力増幅を行うものである。前記送信信号電力増幅器9b
で電力増幅された高周波送信信号Sb8は前記送受信ア
ンテナ7から前記自動車1へ送信され、前記下り回線8
の電波として前記送受信アンテナ3で受信される。前記
高周波受信信号電力増幅器2cは送受信アンテナ3で受
信された電波Sb9を電力増幅するものである。前記伝
送容量が異なる複数の変調方式に対応した復調器13g
は前記高周波受信信号電力増幅器2cで増幅された受信
信号Sb10をとりだし、前記伝送容量が異なる複数の
変調方式をもつ変調器14dで変調された信号Db7を
復調するものである。前記切換信号検出器13eは前記
切換信号送信器14cで送信された切換情報Sb6(前
記変調器選択処理器14bにより選択した変調方式の情
報と切換タイミングの情報)を検出するものである。前
記復調器選択処理器13fは前記切換信号検出器13e
で検出された切換情報Sb6により復調器を選択するも
のである。ここで、前記切換情報Sb6にある切換タイ
ミングになると前記伝送容量が異なる複数の変調方式を
もつ変調器14dと前記伝送容量が異なる複数の変調方
式に対応した復調器13gが前記切換情報Sb6にある
変復調方式に切り換わり、復調された情報Sa11は前
記データ端末4へ送られ、前記自社10側から前記自動
車1側へ向けての伝送路の伝送状態に応じたデータ伝送
が完了する。上記の一連の変復調器切換動作を伝送路の
伝送状態による信号の強度の変動に連動して行うもので
ある。
[0008] After the start of transmission, the signal strength varies depending on the transmission state of the transmission path. At this time, the signal strength detector 13
“a” detects the signal intensity from the detection signal Sa1 obtained from the reception signal of the transmission / reception antenna 3 or the reception signal Sa2 of the demodulator 13g corresponding to a plurality of modulation schemes having different transmission capacities. The modulator selection processor 13b is provided with a signal strength Sa detected by the signal strength detector 13a.
3 transmits a selection signal Sa5 for selecting the modulation method of the information Sa4 processed by the data terminal 4. At this time,
When the transmission state of the transmission path is good, the modulation method is switched to a modulation method with a large transmission capacity, and when the transmission state is bad, the modulation method is switched to a small modulation method. Further, the switching signal transmitter 13c transmits the switching information S
a6 (information on the modulation scheme selected by the modulator selection processor 13b and information on the switching timing) are transmitted. A modulator 13d having a plurality of modulation schemes having different transmission capacities modulates the information Sa4 processed by the data terminal 4 and the switching information Sa6 transmitted by the switching signal transmitter 13c. The transmission signal power amplifier 2b performs power amplification for transmitting the transmission signal Sa7 modulated by the modulator 13d having a plurality of modulation schemes having different transmission capacities as radio waves. The high-frequency transmission signal Sa8 power-amplified by the transmission signal power amplifier 2b is transmitted from the transmission / reception antenna 3 to the base station 6, and received by the transmission / reception antenna 7 as radio waves of the uplink 5. The high frequency reception signal power amplifier 9c amplifies the power of the radio wave Sa9 received by the transmission / reception antenna 7. The demodulator 14g corresponding to a plurality of modulation schemes having different transmission capacities receives the reception signal Sa1 amplified by the high-frequency reception signal power amplifier 9c.
0 is demodulated to demodulate the signal Sa7 modulated by the modulator 13d having a plurality of modulation schemes having different transmission capacities. The switching signal detector 14e detects the switching information Sa6 (information of the modulation scheme selected by the modulator selection processor 13b and information of the switching timing) transmitted by the switching signal transmitter 13c. The demodulator selection processor 14f selects a demodulator based on the switching information Sa6 detected by the switching signal detector 14e.
Here, at the switching timing in the switching information Sa6, the switching information Sa6 includes a modulator 13d having a plurality of modulation schemes having different transmission capacities and a demodulator 14g corresponding to a plurality of modulation schemes having different transmission capacities. Switching to the modulation and demodulation method, the demodulated information Sa11 is sent to the data terminal 12 via the communication line 11, and the vehicle 1
Data transmission according to the transmission state of the transmission path from the side to the company 10 is provided. The signal strength detector 14a detects the signal strength based on a detection signal Sb1 obtained from a reception signal of the transmission / reception antenna 7 or a reception signal Sb2 of a demodulator 14g corresponding to a plurality of modulation schemes having different transmission capacities. The modulator selection processor 14b
Is information Sb processed by the data terminal 12 from the signal strength Sb3 detected by the signal strength detector 14a.
A selection signal Sb5 for selecting the modulation method No. 4 is transmitted. At this time, when the transmission state of the transmission path is good, the modulation method is switched to a modulation method with a large transmission capacity, and when the transmission state is bad, the modulation method is switched to a small modulation method. Further, the switching signal transmitter 14c transmits switching information Sb6 (information of the modulation scheme selected by the modulator selection processor 14b and information of switching timing). The modulator 14d having a plurality of modulation schemes having different transmission capacities includes information Sb4 processed by the data terminal 12 and switching information Sb6 transmitted by the switching signal transmitter 14c.
Modulate The record transmission signal power amplifier 9b performs power amplification for transmitting the transmission signal Sb7 modulated by the modulator 14d having a plurality of modulation methods having different transmission capacities as radio waves. The transmission signal power amplifier 9b
The high-frequency transmission signal Sb8 power-amplified in the transmission line 8 is transmitted from the transmission / reception antenna 7 to the vehicle 1,
At the transmission / reception antenna 3 as a radio wave. The high frequency reception signal power amplifier 2c is for amplifying the power of the radio wave Sb9 received by the transmission / reception antenna 3. Demodulator 13g corresponding to a plurality of modulation schemes having different transmission capacities
Is for taking out the reception signal Sb10 amplified by the high-frequency reception signal power amplifier 2c and demodulating the signal Db7 modulated by the modulator 14d having a plurality of modulation schemes having different transmission capacities. The switching signal detector 13e detects the switching information Sb6 (information of the modulation scheme selected by the modulator selection processor 14b and information of the switching timing) transmitted by the switching signal transmitter 14c. The demodulator selection processor 13f is connected to the switching signal detector 13e.
The demodulator is selected based on the switching information Sb6 detected in step (1). Here, at the switching timing in the switching information Sb6, the switching information Sb6 includes a modulator 14d having a plurality of modulation schemes with different transmission capacities and a demodulator 13g corresponding to the plurality of modulation schemes with different transmission capacities. Switching to the modulation / demodulation method, the demodulated information Sa11 is sent to the data terminal 4, and the data transmission according to the transmission state of the transmission path from the company 10 to the automobile 1 is completed. The above-described series of modulation / demodulator switching operations are performed in conjunction with fluctuations in signal strength due to the transmission state of the transmission path.

【0009】実施の形態2.図2はこの実施の形態2に
おけるビット誤り率による変復調器切換動作判定の例を
示す図であり、実施の形態1の図1において、信号強度
検出器13aの手段として、復調した受信信号のビット
誤り率により信号強度を検出する機能に特徴を有するも
のであり、上記の一連の変復調器切換動作を復調した受
信信号のビット誤り率に連動して行うものである。
Embodiment 2 FIG. 2 is a diagram showing an example of a modem switching operation determination based on a bit error rate according to the second embodiment. In FIG. 1 according to the first embodiment, as a means of the signal strength detector 13a, a bit of a demodulated received signal is used. It has a feature of detecting the signal strength based on the error rate, and performs the above-described series of modem switching operations in conjunction with the bit error rate of the demodulated received signal.

【0010】次に特徴として復調した受信信号のビット
誤り率による変復調器切換動作について説明する。図2
は復調した受信信号のビット誤り率による変復調器切換
動作の判定例であって、縦軸は復調した受信信号のビッ
ト誤り率であり横軸は時間である。変調方式切換の判定
値は変復調方式による通達性能から設定される値であっ
て、変調方式切換の判定値より復調した受信信号のビッ
ト誤り率が小さければ伝送路の伝送状態が良好な場合と
判断し伝送容量の大きな変調方式に、大きければ不良な
場合と判断し伝送容量の小さな変調方式に切り換えるも
のである。
Next, a description will be given of a modulation / demodulator switching operation based on the bit error rate of the demodulated received signal. FIG.
Is a determination example of the modem switching operation based on the bit error rate of the demodulated received signal. The vertical axis is the bit error rate of the demodulated received signal, and the horizontal axis is time. The judgment value of the modulation system switching is a value set from the notification performance of the modulation and demodulation system. If the bit error rate of the demodulated received signal is smaller than the modulation system switching judgment value, it is determined that the transmission state of the transmission line is good. Then, the modulation method is determined to be a modulation method having a large transmission capacity, and if it is large, it is determined to be a failure, and the modulation method is switched to a modulation method having a small transmission capacity.

【0011】[0011]

【発明の効果】以上に述べたようにこの発明によれば、
伝送路の伝送状態に適応し変復調方式を選択することに
より、伝送品質を劣化させることなく伝送容量を増大さ
せることを可能とする。
As described above, according to the present invention,
By selecting the modulation and demodulation method according to the transmission state of the transmission path, it is possible to increase the transmission capacity without deteriorating the transmission quality.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 この発明による無線機の実施の形態1を示す
図である。
FIG. 1 is a diagram showing a first embodiment of a wireless device according to the present invention.

【図2】 この発明による無線機の実施の形態2におけ
るビット誤り率による変復調器切換動作判定の例を示す
図である。
FIG. 2 is a diagram illustrating an example of a modem switching operation determination based on a bit error rate in a wireless device according to a second embodiment of the present invention.

【図3】 従来の自動車電話システムの例を示す図であ
る。
FIG. 3 is a diagram showing an example of a conventional car telephone system.

【図4】 従来の自動車電話システムの無線機を介した
接続の例を示す図である。
FIG. 4 is a diagram showing an example of connection via a wireless device of a conventional car telephone system.

【符号の説明】[Explanation of symbols]

1 自動車、2 自動車側無線機、2a 変調器、2b
送信信号電力増幅器、2c 高周波受信信号電力増幅
器、2d 復調器、3 自動車側送受信アンテナ、4
自動車側データ端末、5 上り回線、6 基地局、7
基地局側送受信アンテナ、8 下り回線、9 基地局側
無線機、9a 変調器、9b 送信信号電力増幅器、9
c 高周波受信信号電力増幅器、9d 復調器、10
自社、11 通信回線、12 自社側データ端末、13
無線機、13a 信号強度検出器、13b 変調器選
択処理器、13c 切換信号送信器、13d 伝送容量
が異なる複数の変調方式をもつ変調器、13e 切換信
号検出器、13f 復調器選択処理器、13g 伝送容
量が異なる複数の変調方式に対応した復調器、14無線
機、14a 信号強度検出器、14b 変調器選択処理
器、14c 切換信号送信器、14d 伝送容量が異な
る複数の変調方式をもつ変調器、14e切換信号検出
器、14f 復調器選択処理器、14g 伝送容量が異
なる複数の変調方式に対応した復調器。
1 car, 2 car radio, 2a modulator, 2b
Transmission signal power amplifier, 2c High frequency reception signal power amplifier, 2d demodulator, 3 Car side transmitting / receiving antenna, 4
Automobile data terminal, 5 uplink, 6 base stations, 7
Base station side transmitting / receiving antenna, 8 downlink, 9 base station side radio, 9a modulator, 9b transmission signal power amplifier, 9
c High frequency received signal power amplifier, 9d demodulator, 10
Company, 11 Communication line, 12 Company data terminal, 13
Radio, 13a signal strength detector, 13b modulator selection processor, 13c switching signal transmitter, 13d modulator with multiple modulation schemes with different transmission capacities, 13e switching signal detector, 13f demodulator selection processor, 13g Demodulators corresponding to a plurality of modulation schemes having different transmission capacities, 14 radios, 14a signal strength detectors, 14b modulator selection processors, 14c switching signal transmitters, 14d modulators having a plurality of modulation schemes having different transmission capacities , 14e switching signal detector, 14f demodulator selection processor, 14g demodulator corresponding to a plurality of modulation schemes having different transmission capacities.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) H04Q 7/24 7/26 7/30 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H04Q 7/24 7/26 7/30

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 自動車電話システムなどで用いられる無
線機において、対応する無線機からの信号の強度を検出
する手段と、検出した信号の強度に基づき変調方式の切
り換えを判断する手段と、送信信号を複数の変調方式で
変調する手段と、変調の切り換え情報を対応する無線機
に伝達する手段と、対応する無線機に設けられる伝達さ
れた切り換え情報に基づき復調方式の切り換えを行う手
段と、対応する無線機に設けられる受信信号を複数の復
調方式で復調する手段を備えた無線機。
1. A wireless device used in an automobile telephone system or the like, means for detecting the intensity of a signal from a corresponding wireless device, means for determining switching of a modulation method based on the intensity of the detected signal, and transmission signal Means for modulating a plurality of modulation schemes, means for transmitting modulation switching information to a corresponding radio, and means for switching a demodulation scheme based on the transmitted switching information provided in the corresponding radio. A wireless device provided with means for demodulating a received signal provided in the wireless device to perform demodulation by a plurality of demodulation methods.
【請求項2】 対応する無線機からの信号の強度を検出
する手段として、復調した受信信号のビット誤り率を用
いて信号の強度を検出することを特徴とする請求項1記
載の無線機。
2. The wireless device according to claim 1, wherein the means for detecting the intensity of the signal from the corresponding wireless device detects the signal intensity using a bit error rate of the demodulated received signal.
JP11017153A 1999-01-26 1999-01-26 Radio equipment Pending JP2000216723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11017153A JP2000216723A (en) 1999-01-26 1999-01-26 Radio equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11017153A JP2000216723A (en) 1999-01-26 1999-01-26 Radio equipment

Publications (1)

Publication Number Publication Date
JP2000216723A true JP2000216723A (en) 2000-08-04

Family

ID=11936049

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11017153A Pending JP2000216723A (en) 1999-01-26 1999-01-26 Radio equipment

Country Status (1)

Country Link
JP (1) JP2000216723A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002368762A (en) * 2001-06-06 2002-12-20 Olympus Optical Co Ltd Local network system, network system and video conference system, and mobile communication unit
JP2003061145A (en) * 2001-08-10 2003-02-28 Hitachi Kokusai Electric Inc Wireless communication method and wireless system
US7050761B2 (en) 2001-02-28 2006-05-23 Nec Corporation Mobile communication system, transmission mode switching method, and recording medium having transmission mode switching method recorded thereon
CN100414856C (en) * 2004-03-29 2008-08-27 株式会社日立国际电气 Radio communication method and radio communication apparatus using adaptive modulation system
CN116826528A (en) * 2023-06-16 2023-09-29 上海承控信息科技有限公司 Strong and weak electricity integration equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7050761B2 (en) 2001-02-28 2006-05-23 Nec Corporation Mobile communication system, transmission mode switching method, and recording medium having transmission mode switching method recorded thereon
JP2002368762A (en) * 2001-06-06 2002-12-20 Olympus Optical Co Ltd Local network system, network system and video conference system, and mobile communication unit
JP2003061145A (en) * 2001-08-10 2003-02-28 Hitachi Kokusai Electric Inc Wireless communication method and wireless system
JP4630499B2 (en) * 2001-08-10 2011-02-09 株式会社日立国際電気 Wireless communication method and wireless system
CN100414856C (en) * 2004-03-29 2008-08-27 株式会社日立国际电气 Radio communication method and radio communication apparatus using adaptive modulation system
CN116826528A (en) * 2023-06-16 2023-09-29 上海承控信息科技有限公司 Strong and weak electricity integration equipment
CN116826528B (en) * 2023-06-16 2024-03-12 上海承控信息科技有限公司 Strong and weak electricity integration equipment

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