JPH04196927A - Automatic equalizer - Google Patents
Automatic equalizerInfo
- Publication number
- JPH04196927A JPH04196927A JP2332365A JP33236590A JPH04196927A JP H04196927 A JPH04196927 A JP H04196927A JP 2332365 A JP2332365 A JP 2332365A JP 33236590 A JP33236590 A JP 33236590A JP H04196927 A JPH04196927 A JP H04196927A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- training
- automatic equalizer
- automatic
- data
- 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
Links
- 238000012937 correction Methods 0.000 claims abstract description 4
- 238000012549 training Methods 0.000 abstract description 18
- 238000004891 communication Methods 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
- H04L2025/03783—Details of reference signals
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は多値直交ディジタル変調方式を用いた無線通信
方式に利用される自動等化器に関するものであム
従来の技術
最近 多値直交ディジタル変調方式＆上 周波数効率の
高さと大量のデータ伝送への適性のため通信衛星と地上
固定局間での衛星通信分野だけでなく、構内データ伝送
をはじめとする地上移動体通信の分野において私 その
適用が検討されていも衛星通信においては伝送路の劣化
要因は雑音成分が支配的であり、等化器の必要性は低し
＼ 一方、地上移動体通信においては伝送路の劣化要因
はマルチパスとフェージングによる伝送路歪が支配的で
あり、自動等化器の使用が必要であ４発明が解決しよう
とする課題
しかし従来は 自動等化器のトレーニング信号にデータ
部と同じ多値直交ディジタル信号を用いていたたぬ ト
レーニング信号の信号雑音比が大きくとれず、 トレー
ニング期間を短くすることが困難であるという課題を有
していた
本発明は上記課題を解決するもので、多値直交ディジタ
ル変調方式を用いた無線通信システムにおいて、復調装
置に備えられる自動等化器のトレ−ニング期間を短くす
ることを可能にする自動等花器を提供するものであム
課題を解決するための手段
本発明は多値直交ディジタル信号の波形等化用のトレー
ニング信号の一部として、ＱＰＳＫ信号を用いることに
より、 トレーニング期間中の信号雑音比を十分に確保
し、上記目的を達成するものであム
作用
本発明は上記手段により、多値直交ディジタル変調方式
を用いた通信において、通信信号中の自動等化器のトレ
ーニングに必要な信号を減少することができるようにし
たものであム
欠庫剖
以下、本発明の実施例について説明すも 第１図は本発
明の一実施例におけるブロック図であム第１図において
、 １０１は送信データを多値直交変調するための多値
直交変調器 １０２は受信信号をベースバンド信号に変
調する検波器 １０３は直交検波されたベースバンド信
号を波形等化す ・るための自動等化１１０４は自動等
化器の出力信号からデータを複合するための直交複合器
であム
次に 第２図を参照して送信信号の構成について説明し
てお（。第２図において、 ２０１は自動等花器内部の
タップゲインを自動修正するためのトレーニング信号区
が ２０２は各種の情報を伝送するためのデータ信号区
間であム
次に 第３図を参照して、変調方式が１６０ＡＭの場合
のトレーニング部およびデータ部の信号について説明す
ム 第３図は直交座標系における直交信号のマツピング
を示してい、Ｌ １６ＱＡＭでは 第３図のデータの
ように１６箇所の信号点を持つ力＼ このうち最大振幅
となるのは左上 左下、右土 右下の４点であム この
４点だけを用いてＱＰＳＫ信号としたものがトレーニン
グ部の信号とな４ １６ＱＡＭ以外の多値直交変調方式
において板 最大振幅を持つ４点が存在し、この４点だ
けを用いたＱＰＳＫ信号がトレーニング信号となム
上記構成において、以下自動等花器の動作について説明
すも 自動等花器１０’３番上 トレーニング区間２０
１中Ｇｅｔ、 検波器１０２でベースバンド帯に変換
された受信信号をＱＰＳＫ信号とみなして自動等化器内
部のタップゲインを自動修正す４一方、データ区間２０
２になると、受信信号を多値直交変調信号として等化を
行なし＼ 直交復号器１０４によってデータの複合を行
なう。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic equalizer used in a wireless communication system using a multilevel orthogonal digital modulation system. Due to its high frequency efficiency and suitability for large amounts of data transmission, its application is not only in the field of satellite communication between communication satellites and fixed terrestrial stations, but also in the field of terrestrial mobile communication, including in-plant data transmission. However, in satellite communications, noise components are the dominant cause of transmission path deterioration, and the need for an equalizer is low.\On the other hand, in terrestrial mobile communications, the deterioration factors of transmission paths are multipath and fading. The transmission path distortion caused by The present invention solves the above problems in that the signal-to-noise ratio of the training signal cannot be kept high and it is difficult to shorten the training period. An object of the present invention is to provide an automatic equalizer that makes it possible to shorten the training period of an automatic equalizer provided in a demodulator in a wireless communication system using a demodulator. By using a QPSK signal as a part of the training signal for waveform equalization of a value-orthogonal digital signal, a sufficient signal-to-noise ratio is ensured during the training period, and the above object is achieved. By the means described above, it is possible to reduce the signal necessary for training an automatic equalizer in a communication signal in communication using a multilevel orthogonal digital modulation method. Fig. 1 is a block diagram of an embodiment of the present invention. In Fig. 1, 101 is a multi-value orthogonal modulator for performing multi-value orthogonal modulation on transmission data, and 102 is a multi-value orthogonal modulator for performing multi-value orthogonal modulation on transmission data. The detector 103 modulates the baseband signal into a baseband signal, and the automatic equalizer 1104 is an orthogonal composite device that combines data from the output signal of the automatic equalizer. Next, the structure of the transmission signal will be explained with reference to Fig. 2 (In Fig. 2, 201 is a training signal section for automatically correcting the tap gain inside the automatic flower vase, and 202 is a training signal section for automatically correcting the tap gain inside the automatic vase. Next, referring to Figure 3, we will explain the signals of the training part and data part when the modulation method is 160AM. Figure 3 shows the mapping of orthogonal signals in the orthogonal coordinate system. In L 16QAM, as shown in the data in Figure 3, the force has 16 signal points\ Among these, the maximum amplitude is at the four points at the top left, bottom left, bottom right, and bottom right. The QPSK signal obtained by using only these four points becomes the training signal. In the above configuration, the operation of the automatic vase will be explained below. Automatic vase 10'Top 3 Training section 20
1, the received signal converted to the baseband by the detector 102 is regarded as a QPSK signal, and the tap gain inside the automatic equalizer is automatically corrected.4 Meanwhile, the data section 20
2, the received signal is not equalized as a multi-level orthogonal modulation signal, and the orthogonal decoder 104 performs data decoding.
以上本実施例によれば 自動等化器内部のタップゲイン
の自動修正にＱＰＳＫ信号を用いることにより、タップ
ゲインの自動修正を有効に行うことができも
発明の効果
以上のように本発明線 多値直交ディジタル変調方式を
用いた通信において、１動等化器に必要なトレーニング
信号の一部にＱＰＳＫ信号を用いることにより、 トレ
ーニング期間を減少させ通信全体のデータ伝送効率を上
昇させることができもAs described above, according to this embodiment, by using the QPSK signal for automatic correction of the tap gain inside the automatic equalizer, automatic correction of the tap gain can be effectively performed. In communication using the value orthogonal digital modulation method, by using QPSK signals as part of the training signals required for the single-motion equalizer, it is possible to reduce the training period and increase the data transmission efficiency of the entire communication.
第１図は本発明の一実施例における自動等花器マツピン
グを示す概念図であム
１０１・・・多値直交変調器 １０２・・・非同期直交
検波器 １０３・・・ベースバンド複素自動等花器 １
０４・・・多値直交複合器 ２０１トレ一ニング信号訊
２０２・・・データ信号訊FIG. 1 is a conceptual diagram showing automatic isometric mapping in an embodiment of the present invention. 101...Multi-level quadrature modulator 102...Asynchronous quadrature detector 103...Baseband complex automatic isometric vase 1
04... Multi-value orthogonal composite device 201 Training signal signal 202... Data signal signal
Claims (1)
データを等化修正する複数個のタップゲインと、上記タ
ップゲイン値を自動的に修正する修正手段を具備し、タ
ップゲイン値の自動修正用のデータの一部としてＱＰＳ
Ｋ信号を用いることを特徴とする自動等化器。A demodulating device for multilevel orthogonal digital modulated waves is equipped with a plurality of tap gains for equalizing and correcting received data, and a correction means for automatically correcting the tap gain value, and for automatically correcting the tap gain value. QPS as part of the data
An automatic equalizer characterized by using a K signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2332365A JPH04196927A (en) | 1990-11-28 | 1990-11-28 | Automatic equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2332365A JPH04196927A (en) | 1990-11-28 | 1990-11-28 | Automatic equalizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04196927A true JPH04196927A (en) | 1992-07-16 |
Family
ID=18254145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2332365A Pending JPH04196927A (en) | 1990-11-28 | 1990-11-28 | Automatic equalizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04196927A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787154A (en) * | 1993-09-17 | 1995-03-31 | Idou Tsushin Syst Kaihatsu Kk | Frame synchronizing method for multilevel quadrature amplitude modulation system |
| WO2002087184A1 (en) * | 2001-04-23 | 2002-10-31 | Telefonaktiebolaget Lm Ericsson_(Publ) | Method, apparatus and system for synchronization in radio communication systems |
| JP2010525709A (en) * | 2007-04-30 | 2010-07-22 | ノキア シーメンス ネットワークス オサケユヒティエ | Data modulation in communication systems |
| JP2012165451A (en) * | 2007-02-08 | 2012-08-30 | Samsung Electronics Co Ltd | Method and apparatus for transmitting and receiving data in communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5289407A (en) * | 1976-01-21 | 1977-07-27 | Nec Corp | Transmitter/receiver for data transmission |
| JPS5924568A (en) * | 1982-07-31 | 1984-02-08 | Kubota Ltd | Roll for rolling h-beam |
-
1990
- 1990-11-28 JP JP2332365A patent/JPH04196927A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5289407A (en) * | 1976-01-21 | 1977-07-27 | Nec Corp | Transmitter/receiver for data transmission |
| JPS5924568A (en) * | 1982-07-31 | 1984-02-08 | Kubota Ltd | Roll for rolling h-beam |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787154A (en) * | 1993-09-17 | 1995-03-31 | Idou Tsushin Syst Kaihatsu Kk | Frame synchronizing method for multilevel quadrature amplitude modulation system |
| WO2002087184A1 (en) * | 2001-04-23 | 2002-10-31 | Telefonaktiebolaget Lm Ericsson_(Publ) | Method, apparatus and system for synchronization in radio communication systems |
| US6983151B2 (en) | 2001-04-23 | 2006-01-03 | Telefonaktiebolaget L M Ericsson (Publ) | Method, apparatus and system for synchronization in radio communication systems |
| JP2012165451A (en) * | 2007-02-08 | 2012-08-30 | Samsung Electronics Co Ltd | Method and apparatus for transmitting and receiving data in communication system |
| JP2010525709A (en) * | 2007-04-30 | 2010-07-22 | ノキア シーメンス ネットワークス オサケユヒティエ | Data modulation in communication systems |
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