JPH05130082A - 可変変調通信方式 - Google Patents

可変変調通信方式

Info

Publication number
JPH05130082A
JPH05130082A JP3286064A JP28606491A JPH05130082A JP H05130082 A JPH05130082 A JP H05130082A JP 3286064 A JP3286064 A JP 3286064A JP 28606491 A JP28606491 A JP 28606491A JP H05130082 A JPH05130082 A JP H05130082A
Authority
JP
Japan
Prior art keywords
modulation
communication system
terminal equipments
base station
adopted
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.)
Granted
Application number
JP3286064A
Other languages
English (en)
Other versions
JP2776094B2 (ja
Inventor
Yukitsuna Furuya
之綱 古谷
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP3286064A priority Critical patent/JP2776094B2/ja
Priority to US07/967,278 priority patent/US5577087A/en
Publication of JPH05130082A publication Critical patent/JPH05130082A/ja
Application granted granted Critical
Publication of JP2776094B2 publication Critical patent/JP2776094B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0022—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is influenced by the user

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

(57)【要約】 【目的】 広いサービスエリアを確保しつつ、周波数利
用効率の高い無線通信方式を提供する。 【構成】 基地局から遠い端末１，２に対しては雑音い
強いＱＰＳＫを採用し、基地局に近い端末３，４に対し
ては周波数利用効率の高い１６ＱＡＭを採用する。どの
端末に対しても一定の情報転送速度を提供するために端
末１，２に対しては３回に１回のスロット割当を行端末
３，４に対しては６回に１回の割当を行う。 【効果】 広いサービスエリアが確保でき、近い端末に
対しては周波数利用効率の高い変調方式が採用できる。

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は複数の端末を収容するデ
ジタル無線通信システムの変調方式に関する。
【０００２】
【従来の技術】従来、無線通信システムにおける変調方
式はシステム毎に固定的に定められており、伝送路の状
態に拘らず一定である。例えば日米のデジタル自動車電
話はπ／４シフトＱＰＳＫという４値の変調方式を採用
しており、これはどのような状態でも同一の変調方式で
ある。より周波数利用効率を高める方策の一つとして、
１６値などの多値の変調方式を採用することが考えられ
る。しかしながらこの様な方式を採用すると、雑音に弱
くなりサービスエリアが狭くなってしまう。
【０００３】伝送路の状態によって変調方式を変えてサ
ービスエリアを確保することは、既にファクシミリ装置
などに用いられている電話帯のモデムにおいて採用され
ている。このことは、工学研究社のデータ通信技術講座
の第３分冊の９３ページに詳細に記述されている。この
場合には、伝送路が通常の状態である場合には１６値の
変調によって９６００ｂｐｓを伝送し、状態が悪い場合
には４値，２値と変調の多値数を削減して通信品質を確
保するようにしている。ファクシミリやデータ通信のよ
うにユーザ間の情報の伝送速度が変動してもかまわない
ものでは、この様に変調方式を可変にする方法が既に実
用化されているが、電話などのように一定の情報の伝送
速度を必要とするものでは、変調方式を変えると伝送速
度が変わってしまうため採用されていないのが現実であ
る。
【０００４】
【発明が解決しようとする課題】この様に従来の通信方
式では、受信電力に拘らず一定の変調方式を採用してい
るために信号電力が強い場合には周波数の利用効率が上
がらないか、一定の情報転送速度を確保できないために
電話などのサービスが提供できないという問題点があ
る。
【０００５】本発明の目的は、上述の従来の無線通信方
式の問題点を解決し、変調方式を可変にすることによっ
て周波数の有効利用を実現し、同時にユーザには一定の
情報転送速度を確保し、かつ広いサービスエリアを確保
する可変変調通信方式を提供することにある。
【０００６】
【課題を解決するための手段】本発明においては、伝送
品質の変動する通信路における時分割多重通信方式にお
いて伝送路の状態が良い場合には多値の変調方式を用い
て時間的に占有する時間を短くし、伝送路の状態が悪い
場合には前記変調方式における多値数を削減し占有時間
を長くして、実質的情報伝送速度を一定に保つことを特
徴とした可変変調通信方式によって上記問題点を解決し
ている。
【０００７】
【作用】伝送路の状態が悪い場合に変調方式を変える
と、伝送速度は必然的に低下してしまう。これに対処す
るためにまず考えられる方式は、送信のシンボルレート
を高めることである。例えば変調の多値数は１６から４
に削減する代わりにシンボルレートを２倍にすれば、伝
送できる実質的情報量は同一に保つことができる。しか
しながらこの方式では、フィルタ系などが全て変わって
しまいハードウェアの実現が困難になることや無線通信
においては占有帯域幅も変わってしまい他のシステムと
の干渉を起こすという電波管理上の問題点も引き起こ
す。
【０００８】本発明においては、この様な問題点を回避
するために可変変調方式を時分割多重方式を組み合わせ
るという手法を採用する。即ち多値の伝送を行って情報
の転送速度が早い端末に対しては１フレームに１回の送
信を割り当てるのに対して、状態が悪く変調の多値数を
下げた端末に対しては１フレームの複数回の送信を割り
当てることによって、全ての端末に対して一定の情報転
送速度を実現するものである。
【０００９】
【実施例】図１に本発明の一実施例を示す。図１（ａ）
は本発明で用いられる変調方式を示す図であり、図１
（ｂ）は本発明の時分割多重方法を示す図である。ま
た、図２には、本発明を用いるシステムの基地局と端末
の一の例を示す。
【００１０】図２において、端末１，２，３，４はそれ
ぞれ基地局１０と通信する。ここで端末１と２は基地局
１０から遠く、端末３と４は基地局１０に近いものとす
る。従って基地局１０は、端末１と２に対しては４値の
変調方式であるＱＰＳＫを採用し、端末３と４は１６値
の変調方式である１６ＱＡＭを採用する。そしてこれら
の端末は図１（ｂ）に示す様に時分割多重して信号を送
信する。１６ＱＡＭはＱＰＳＫと比較して２倍の情報転
送能力を有しているため、時分割多重のスロット割当
に、図１（ｂ）では端末１と２に対しては３回に１回、
端末３と４に対しては６回に１回の割当が行われる。こ
の様にすることで、基地局に近い端末は多値の変調方式
を採用し、基地局から遠い端末は多値数を減らした変調
方式を採用して同一の情報転送速度を実現することがで
きる。これを全てＱＰＳＫで通信すると、同時に３端末
までしか通信できず、本発明によって明らかに周波数利
用効率が向上している。また、全て１６ＱＡＭで通信し
ようとすると端末１と２にはサービスを提供できないこ
とになってしまう。
【００１１】図３には、変調方式選択の手順の例を示
す。端末は基地局からの制御信号を受信し、その受信信
号の品質をチェックしている。利用者が発信ボタンを押
すなどして通信要求をかけると、端末はチェックした品
質に基づいて基地局に接続要求信号と共に希望の変調方
式を通知する。基地局では受信信号の品質をチェックし
て希望の変調方式で通話ができるかどうかを判断すると
共に空きチャネルを探し、チャネル及び変調方式を指定
する。端末はこれに対して確認応答（ＡＣＫ）を返すと
共に指定されたチャネルへ移動し、通話を開始する。
【００１２】この様にすることで、端末が移動してもそ
のときの状態に応じた変調方式を採ることができる。ま
た、端末が移動して通話中に状態が変わった場合には、
変調方式を切り換えることも可能である。
【００１３】
【発明の効果】以上詳細に説明したように本発明によれ
ば、変調方式を端末の状態に応じて切り換えることで周
波数利用効率が高く、かつサービス範囲の広い無線通信
方式を提供することができる。
【図面の簡単な説明】
【図１】本発明の一実施例を示す図で、（ａ）は変調方
式、（ｂ）はチャネル割当の例を示す図である。
【図２】本発明の用いられるシステムの例を示す図であ
る。
【図３】本発明における変調方式決定の手順を示す図で
ある。

Claims (1)

    【特許請求の範囲】
  1. 【請求項１】伝送品質の変動する通信路における時分割
    多重通信方式において伝送路の状態が良い場合には多値
    の変調方式を用いて時間的に占有する時間を短くし、伝
    送路の状態が悪い場合には前記変調方式における多値数
    を削減し占有時間を長くして、実質的情報伝送速度を一
    定に保つことを特徴とする可変変調通信方式。
JP3286064A 1991-10-31 1991-10-31 可変変調通信方法 Expired - Lifetime JP2776094B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP3286064A JP2776094B2 (ja) 1991-10-31 1991-10-31 可変変調通信方法
US07/967,278 US5577087A (en) 1991-10-31 1992-10-27 Variable modulation communication method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3286064A JP2776094B2 (ja) 1991-10-31 1991-10-31 可変変調通信方法

Publications (2)

Publication Number Publication Date
JPH05130082A true JPH05130082A (ja) 1993-05-25
JP2776094B2 JP2776094B2 (ja) 1998-07-16

Family

ID=17699487

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3286064A Expired - Lifetime JP2776094B2 (ja) 1991-10-31 1991-10-31 可変変調通信方法

Country Status (2)

Country Link
US (1) US5577087A (ja)
JP (1) JP2776094B2 (ja)

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