JPS59143438A - Synchronization holding device - Google Patents
Synchronization holding deviceInfo
- Publication number
- JPS59143438A JPS59143438A JP58017325A JP1732583A JPS59143438A JP S59143438 A JPS59143438 A JP S59143438A JP 58017325 A JP58017325 A JP 58017325A JP 1732583 A JP1732583 A JP 1732583A JP S59143438 A JPS59143438 A JP S59143438A
- Authority
- JP
- Japan
- Prior art keywords
- synchronization
- signal
- detecting
- correct
- detection 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、同＋ｉＪｌ保持装置に係り、特にスペクトラ
ム拡散通信方式における同期保持装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an iJl holding device, and particularly to a synchronization holding device in a spread spectrum communication system.
情報信号よりも十分幅広い帯域を持つ拡散符号で帯域拡
散するスペクトラム拡散ノ１信方式において、この拡散
符号の１周期の末尾ビットパターンを検出し、同期を確
立する方式が考案されている。In a spread spectrum single transmission system that spreads the band using a spreading code that has a band sufficiently wider than the information signal, a method has been devised in which the last bit pattern of one cycle of this spreading code is detected and synchronization is established.
この方式は、出願人が特願昭５７−１８４５４１号とし
て提案したものである。この方式の構成を第１図によっ
て説明する。受信側で、搬送波周波数成分を除去したあ
との信号１１は、末尾ビットパターン検出器１と逆拡散
器３に入る。末尾ビットパターン検出器１において、予
め設定したビットパターンと同じ末尾ビットパターンが
検出される。This method was proposed by the applicant in Japanese Patent Application No. 184541/1983. The configuration of this system will be explained with reference to FIG. On the receiving side, the signal 11 after removing the carrier frequency component enters a tail bit pattern detector 1 and a despreader 3. The tail bit pattern detector 1 detects the same tail bit pattern as a preset bit pattern.
この偵出信号１２は拡散符号発生器２を起動する。This scout signal 12 activates the spreading code generator 2.
これにより発生された拡散符号１３は、逆拡散器３に入
り受信信号を逆拡散する。The spread code 13 generated thereby enters the despreader 3 and despreads the received signal.
この方式においては、伝送雑音によシ受信信号に誤りが
生じ、１同期の末尾でないときにビットパターンが検出
され、正しい逆拡散が行なわれないという可能性がある
。また逆に、正しく検出されているときに、この伝送誤
シにより末尾ビットパターンが使用されず拡散符号発生
がなされなくなシ、安定な同期が維持されないという問
題点があった。In this method, there is a possibility that errors occur in the received signal due to transmission noise, that a bit pattern is detected when it is not at the end of one synchronization, and that correct despreading is not performed. On the other hand, even when the detection is correct, due to the transmission error, the last bit pattern is not used and the spreading code is not generated, which causes the problem that stable synchronization cannot be maintained.
本発明の目的は、同期確立時に伝送ノイズによって誤っ
た同期検出信号が出力された場合にも、それを却下し、
正しく同期確立させるとともに、正しく同用１している
ときの伝送ノイズによる誤った同期検出信号を無視し、
さらに同期がとれているときに伝送ノイズによって突発
的に同期切出信号が出力されない場合にも同期が保持さ
れる同期保持装置６：を提供することにある。An object of the present invention is to reject even if an erroneous synchronization detection signal is output due to transmission noise when synchronization is established,
In addition to establishing correct synchronization, it also ignores incorrect synchronization detection signals due to transmission noise when synchronization is being performed correctly.
Furthermore, it is an object of the present invention to provide a synchronization holding device 6 that maintains synchronization even when a synchronization cutting signal is suddenly not output due to transmission noise when synchronization is established.
帯域拡散す鳴符号の性質によシ、正しく同期されていな
ければ、逆拡散を行なった場合、１または０の状態を送
信しだにもかかわらず、その中間の値が得られ正しくデ
ータが再生されない。しだがって、本発明はこれを判別
し、誤った同期検出信号を却下し、正しく再生できるよ
うに同期検出（Ｆｔ号灸・選釈できるようにしたもので
ある。寸だ、正しく同期を検出しているときに、同期検
出信号が検出されない場合、内部で与えるようにしたも
のである。Due to the nature of the band spread code, if it is not synchronized correctly, when despreading is performed, even though the state of 1 or 0 is transmitted, a value in between will be obtained and the data will be reproduced correctly. Not done. Therefore, the present invention distinguishes this, rejects the erroneous synchronization detection signal, and enables synchronization detection (Ft moxibustion/selection) to enable correct playback. If a synchronization detection signal is not detected during detection, it is provided internally.
以下、本発明の一実施例を図匍により説明する。 Hereinafter, one embodiment of the present invention will be described with reference to figures.
第２図は、本発明の装置６：の−例を備えたスペクトラ
ム拡散通信方式の受信機の構成の一部を示したものであ
る。この図において、逆拡散器３で逆拡散された信号は
フィルタ４を辿って判定信号１５となシ判定器５に入る
。判定器５では、この判定信号１５を予め設定した判定
レベルＬによシ判定し、受付信号１６を制御する。受付
信号１６は同期検出信号制御回路６に導びかれる。これ
によシ、同期検出信号制御回路６は、同期検出器１から
の検出信号１２を制−し、拡散符号発生器２を起動する
信号を出力する。FIG. 2 shows a part of the configuration of a spread spectrum communication receiver including an example of the apparatus 6 of the present invention. In this figure, a signal despread by a despreader 3 passes through a filter 4 and enters a decision signal 15 into a decision device 5. The determiner 5 determines the determination signal 15 based on a preset determination level L, and controls the reception signal 16. The reception signal 16 is guided to the synchronization detection signal control circuit 6. Accordingly, the synchronization detection signal control circuit 6 controls the detection signal 12 from the synchronization detector 1 and outputs a signal for activating the spreading code generator 2.
上述した本発明の装置の一例の動作を第３図〜第５図に
よＩ） ’４Ｒ明する。これらの図において、ａ）は判
定信号１５、ｂ）−は同期検出信号１２、Ｃ）は受付信
号１６を示すものである。第３図は正しく同期している
ときの波形例を示すもので、同期検出信号１２が立上っ
た時点から１周期よシ短い一定時間Ｔだけたった時点で
、判定信号１５は判定レベルＬにより判定される。この
場合、判定信号１５は判定レベルＬを上回っているため
、受付信号１６はロウレベルとなる。受付信号１６がロ
ウレベルのときには、同期検出信号１２のロウレベルが
受付られて、同期検出１ぎ号制御回路６は、拡散符号発
生器に起動をかけ、次の周期に入シ正しく同期が保持さ
れる。The operation of an example of the apparatus of the present invention described above will be explained with reference to FIGS. 3 to 5. In these figures, a) shows the determination signal 15, b)- shows the synchronization detection signal 12, and C) shows the acceptance signal 16. FIG. 3 shows an example of the waveform when synchronization is performed correctly. When a fixed time T shorter than one period has elapsed from the time when the synchronization detection signal 12 rises, the judgment signal 15 is set to the judgment level L. It will be judged. In this case, since the determination signal 15 exceeds the determination level L, the acceptance signal 16 becomes low level. When the reception signal 16 is at a low level, the low level of the synchronization detection signal 12 is accepted, and the synchronization detection signal control circuit 6 activates the spreading code generator to maintain correct synchronization in the next cycle. .
第４図は、同期暎出時に、誤った同期検出信号が入った
場合の波形例を示している。初め、受付信号１６はロウ
レベルとなっていて、同期検出信号１２がロウレベルに
なるのを待っている。同期検出信号１２がロウレベルに
なって、その立上りで判定信号１５をクリアし、受付信
号１６はハイレベルとなシ同期検出信号１２を受付けな
くなる。FIG. 4 shows an example of a waveform when an erroneous synchronization detection signal is input during synchronization detection. Initially, the acceptance signal 16 is at a low level, and the system waits for the synchronization detection signal 12 to become low level. When the synchronization detection signal 12 becomes low level and the rising edge clears the determination signal 15, the acceptance signal 16 becomes high level and the synchronization detection signal 12 is no longer accepted.
これより、時間Ｔだけたった時点で判定信号１５のレベ
ルを判定レベルＬによって判定するが、判定レベルＬに
満たないだめ、受付４６号１６はさらに時間ｔだけハイ
レベルを保つ。これにより、そのときの同期検出信号１
２のロウレベルを受付けない。そのイヒ１、受付信号１
６はロウレベルとなシ次の同期検出信号１２のロウレベ
ルを待つ。上記のようにして、正しい同期瑛出を行ない
、その後は第３図のように保持される。After time T has elapsed, the level of the determination signal 15 is determined based on the determination level L, but unless the determination level L is reached, the reception 46 16 maintains the high level for an additional time t. As a result, the synchronization detection signal 1 at that time
2 low level is not accepted. Ihi 1, reception signal 1
6 waits for the next low level of the synchronization detection signal 12. As described above, correct synchronization is carried out, and thereafter it is maintained as shown in FIG.
第５図は、上記のようにして同期がとれている状牌のと
きに、誤りによシ同期４’９ｉ出倍号１２がロウレベル
になるべきところで、ロウにならなかった場合金示した
ものである。この場合、同期噴出信号制御回路６ｕｚ同
期慣出信号１２がくるものとして内部で拡散符号発生器
２に起動信号を発生させ同期はずれを防止する。Figure 5 shows what happens when the tiles are synchronized as described above, and when the synchronized 4'9i out double number 12 does not go low when it should have gone low due to an error. It is. In this case, assuming that the synchronization ejection signal control circuit 6uz synchronization training signal 12 is coming, an activation signal is internally generated in the spread code generator 2 to prevent synchronization loss.
上記のようにして、正しい同期が確立し、安定に保持さ
れ、雑音の多い伝送系での通信の信頼性を高めることが
できるものである−０
〔発明の効果〕
本発明によれば、伝送ノイズにより誤って同期検出信号
が出力されたことを判定し、正しい同期検出信号を押い
出すことができ、このようにして同期が確立すれば、伝
送ノイズによる誤シ同期検出信号は無視される。さらに
、正しく同期を検出しているときに、誤って正しい同期
検出信号が出ない場合にも同期保持が可能となる。した
がって上記のような伝送ノイズのある２１ｕ信において
、同期保持の安定性に効果がある。As described above, correct synchronization can be established and stably maintained, and the reliability of communication in a noisy transmission system can be improved. It is possible to determine that a synchronization detection signal has been output incorrectly due to noise, and push out the correct synchronization detection signal.If synchronization is established in this way, the incorrect synchronization detection signal caused by transmission noise will be ignored. . Furthermore, synchronization can be maintained even if a correct synchronization detection signal is not output by mistake while synchronization is detected correctly. Therefore, in the 21u communication with transmission noise as described above, the stability of synchronization maintenance is improved.
第１図は匠来のスペクトラム拡散受信装置の構成の一部
を示すブロック線図、第２図は本発明の装置の一実１；
＋’ｉ例を備えた受信装置の構成の一部を示すブロック
線図、箒３図〜Ｉ耳５図は本発明の装置の動作を説明す
るだめの波形例を示す図である。
１・・・末尾ビットパターン四期恢出器、２・・・拡散
符号発生器、３・・・逆拡散器、５・・・再生信号判定
器、６・・・同期検出信号制御回路。
代理人 弁理士 高橋明夫
第 １ 図
２
第 ２ 図FIG. 1 is a block diagram showing part of the configuration of a conventional spread spectrum receiving device, and FIG. 2 is an example of the device of the present invention.
A block diagram showing a part of the configuration of a receiving device equipped with the +'i example, and Figures 3 to 5 are diagrams showing waveform examples for explaining the operation of the device of the present invention. DESCRIPTION OF SYMBOLS 1... Final bit pattern 4-stage calculator, 2... Spreading code generator, 3... Despreader, 5... Playback signal determiner, 6... Synchronization detection signal control circuit. Agent Patent Attorney Akio Takahashi Figure 1 Figure 2 Figure 2
Claims (1)
よって同期を確立するスペクトラム拡散通信方式におい
て、逆拡散したあとの信号の正誤を判定する判定回路を
設け、前記判定回路の出力により、同期検出器からの拡
散符号発生器の発生開始信号を制御することを特徴とす
る同期保持装置。1. In a spread spectrum communication system that establishes synchronization by detecting the last bit pattern of a spread code string, a judgment circuit is provided to judge whether the signal after despreading is correct, and the output of the judgment circuit is used to detect a synchronization detector. A synchronization maintenance device characterized in that it controls a generation start signal of a spreading code generator from a spread code generator.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58017325A JPS59143438A (en) | 1983-02-07 | 1983-02-07 | Synchronization holding device |
| US06/542,023 US4559633A (en) | 1982-10-22 | 1983-10-14 | Spread spectrum system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58017325A JPS59143438A (en) | 1983-02-07 | 1983-02-07 | Synchronization holding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59143438A true JPS59143438A (en) | 1984-08-17 |
Family
ID=11940884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58017325A Pending JPS59143438A (en) | 1982-10-22 | 1983-02-07 | Synchronization holding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59143438A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684737A (en) * | 2011-03-10 | 2012-09-19 | 北京化工大学 | Method for realizing multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm |
-
1983
- 1983-02-07 JP JP58017325A patent/JPS59143438A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684737A (en) * | 2011-03-10 | 2012-09-19 | 北京化工大学 | Method for realizing multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm |
| CN102684737B (en) * | 2011-03-10 | 2014-06-18 | 北京化工大学 | Method for realizing multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm |
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