JPH01288031A - Signal transmission system - Google Patents
Signal transmission systemInfo
- Publication number
- JPH01288031A JPH01288031A JP11698388A JP11698388A JPH01288031A JP H01288031 A JPH01288031 A JP H01288031A JP 11698388 A JP11698388 A JP 11698388A JP 11698388 A JP11698388 A JP 11698388A JP H01288031 A JPH01288031 A JP H01288031A
- Authority
- JP
- Japan
- Prior art keywords
- error correction
- station
- redundant bit
- intermediate relay
- 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
- 230000008054 signal transmission Effects 0.000 title claims description 11
- 238000012937 correction Methods 0.000 claims abstract description 47
- 238000004891 communication Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野コ
本発明はデジタル無線通信において誤り訂正を行う信号
伝送方式、特に中間中継局で誤り訂正(FEC)の符号
化・復号化を行う信号伝送方式の回線監視方式の改良に
関する。[Detailed Description of the Invention] [Industrial Application Fields] The present invention relates to a signal transmission system that performs error correction in digital wireless communication, particularly a signal transmission system that performs error correction (FEC) encoding and decoding at intermediate relay stations. This paper relates to improvements in line monitoring methods.
[従来の技術]
従来よりデジタル無線通信において誤り訂正を行う伝送
方式が周知であり、この種の従来技術としては、中間中
継局で誤り訂正を行う方式が採用されていた。[Prior Art] Transmission systems that perform error correction in digital wireless communication have been well known, and as this type of conventional technology, a system that performs error correction at an intermediate relay station has been adopted.
第2図には、従来の誤り訂正を行う信号伝送方式の構成
およびそのFECENCODERの信号の一例が示され
ている。FIG. 2 shows an example of the configuration of a conventional signal transmission system that performs error correction and its FECEN CODER signal.
同図において、1.1aは搬送端局、101は送端の誤
り訂正符号器(FECENCODER)102は中間中
継局の誤り訂正復号器(FECDECODER) 、1
01 aは中間中継局における誤り訂正符号器、102
aは受端における誤り訂正復号器である。In the figure, 1.1a is a carrier terminal station, 101 is an error correction encoder (FECENCODER) at the sending end, and 102 is an error correction decoder (FECDECODER) at the intermediate relay station.
01 a is an error correction encoder in an intermediate relay station, 102
a is an error correction decoder at the receiving end.
このような従来技術では、送信側端局の訂正符号器10
1から誤り訂正(FEC)の冗長ビットとして伝送され
た信号は、中間中継局の誤り訂正復号器102で復号化
される。In such conventional technology, the correction encoder 10 of the transmitting terminal station
The signal transmitted as error correction (FEC) redundant bits from 1 to 1 is decoded by the error correction decoder 102 of the intermediate relay station.
そして、ここで復号化された誤り訂正(FECENCO
D)の信号は、訂正符号器101aから次局へと伝送さ
れるようになっており、受信側の端局で行われる復号化
は、前局で符号化した誤り訂正(FECENCOD)信
号だけであった。Then, the error correction (FECENCO) decoded here is
The signal D) is transmitted from the correction encoder 101a to the next station, and the receiving end station decodes only the error correction (FECENCOD) signal encoded at the previous station. there were.
このため、この従来技術では、受信側端局での回線品質
監視は、送信側端局で情報ビットに付加されるパリティ
ビットにより誤り率検出を行い、これを回線切替に用い
ることによって行われていた。Therefore, in this conventional technology, line quality monitoring at the receiving terminal station is performed by detecting the error rate using parity bits added to the information bits at the transmitting terminal station, and using this for line switching. Ta.
[解決すべき問題点コ
しかし、このような従来の伝送方式では、受信側の端局
へ伝送される信号は、前局で符号化された誤り訂正(F
ECENCOD)信号だけであり、それ以前の局、すな
わち送信側端局で符号化された誤り訂正(FECENC
OD)信号は、受信側端局へは送られずに、送信側端局
の次の局で復号化(FECDECOD)されるようにな
っていた。[Problems to be solved] However, in such conventional transmission systems, the signal transmitted to the receiving end station is subject to error correction (F) coded at the previous station.
ECENCOD) signal, and the error correction (FECENCOD) signal encoded by the previous station, that is, the transmitting terminal station.
The OD) signal is not sent to the receiving terminal station, but is decoded (FECDECOD) at the station next to the transmitting terminal station.
このため、誤り訂正(FEC)の信号は、端局での回線
品質の監視には用いられず、回線切替は、単にパリティ
ピットにより符号誤り率検出を行い、回線障害を救済す
るよう行われているだけであった。For this reason, error correction (FEC) signals are not used to monitor line quality at terminal stations, and line switching is performed simply by detecting the code error rate using parity pits and relieving line failures. There was only one.
従って、この端局でのパリティピットによる符号誤り率
検出では、回線障害を早期に検出することができないと
いう問題があった。Therefore, the code error rate detection using parity pits at the terminal station has the problem that line failures cannot be detected early.
本発明は、このような従来の課題に鑑みなされたもので
あり、その目的は、デジタル無線通信において誤り回線
障害を早期に検出することができる信号伝送方式を提供
することにある。The present invention has been made in view of such conventional problems, and an object thereof is to provide a signal transmission method that can detect faulty line failures at an early stage in digital wireless communication.
[問題点の解決手段]
前記目的を達成するため、本発明は、
デジタル無線通信を行う各局でそれぞれ誤り訂正の符号
化、復号化を行う信号伝送方式において、端局で誤り訂
正の演算を行った結果と、中間中継局で誤り訂正を行っ
た演算結果との双方を、誤り訂正用の冗長ビットとして
次局へ伝送することにより回線品質の監視を行うよう構
成されている。[Means for Solving Problems] In order to achieve the above object, the present invention provides a signal transmission system in which error correction is encoded and decoded at each station that performs digital wireless communication, and in which error correction calculations are performed at the terminal station. The system is configured to monitor line quality by transmitting both the result of error correction and the calculation result of error correction performed at the intermediate relay station to the next station as redundant bits for error correction.
[実施例コ 次に本発明の好適な実施例を図面に基づき説明する。[Example code] Next, preferred embodiments of the present invention will be described based on the drawings.
本発明は、前述した従来の問題点を解決するために、誤
り訂正(FEC)の冗長ビットとして、端局でFECの
演算を行った結果と中間中継局でのFEC演算結果との
両方を伝送するよう構成したことを特徴とするものであ
る。In order to solve the above-mentioned conventional problems, the present invention transmits both the FEC calculation result at the terminal station and the FEC calculation result at the intermediate relay station as redundant error correction (FEC) bits. It is characterized by being configured to do so.
第1図には、本発明に係る誤り訂正を行う信号伝送方式
の構成と、そのFECENCODERの信号が示されて
いる。FIG. 1 shows the configuration of a signal transmission system for error correction according to the present invention and its FECENCODER signal.
同図において、101は送端の誤り訂正符号器(FEC
ENCODER)、102は中間中継局における誤り訂
正復号器(FECDECO−DER)、101aは中間
中継局の誤り訂正符号器(FECENCODER)、1
02aは受端の誤り訂正復号器(FECDECODER
)である。In the figure, 101 is an error correction encoder (FEC) at the sending end.
ENCODER), 102 is an error correction decoder (FECDECO-DER) in the intermediate relay station, 101a is an error correction encoder (FECENCODER) in the intermediate relay station, 1
02a is an error correction decoder (FECDECODER) at the receiving end.
).
そして、送端の誤り訂正符号器101で、情報ビットは
速度変換され、誤り訂正(FEC)の冗長ビット(B)
が付加されるが、このときもう1つ冗長ビット(C)が
付加される。Then, in the error correction encoder 101 at the sending end, the information bits are speed-converted and converted into redundant bits (B) for error correction (FEC).
is added, but at this time, another redundant bit (C) is added.
そして、送端側から中間中継局に信号が送られてくると
、この信号は、中間中継局における誤り訂正復号器10
2で復号化される。このとき使用される誤り訂正(FE
C)の冗長ビットは、(B)だけで、冗長ビット(C)
は使用しない。Then, when a signal is sent from the sending end to the intermediate relay station, this signal is transmitted to the error correction decoder 10 at the intermediate relay station.
2 to be decrypted. Error correction (FE) used at this time
The redundant bit of C) is only (B), and the redundant bit of (C)
is not used.
そして、このときの信号は、中間中継局で再び誤り訂正
復号器101aにより符号化され、冗長ビット(B)は
冗長ビット(D)となって次局へと伝送される。このと
き冗長ビット(C)はそのまま下位の局へと伝送される
。Then, the signal at this time is encoded again by the error correction decoder 101a at the intermediate relay station, and the redundant bit (B) becomes a redundant bit (D) and is transmitted to the next station. At this time, the redundant bit (C) is transmitted as is to the lower station.
つまり、送端でのFEC演算結果(冗長ビット(C))
はそのまま順次下位の局へと伝送されることになる。In other words, the FEC operation result (redundant bit (C)) at the sending end
will be transmitted as is to the lower stations in sequence.
本発明は、この冗長ビット(C)を用いて、回線品質の
監視を行い、冗長ビット(C)により符号誤り検出を行
い回線切替を行うことができる。The present invention uses this redundant bit (C) to monitor line quality, detect code errors using the redundant bit (C), and switch lines.
なお、本発明は前記実施例に限定されるものではなく、
本発明の要旨の範囲内で各種の変形実施が可能である。Note that the present invention is not limited to the above embodiments,
Various modifications can be made within the scope of the invention.
[発明の効果コ
以上説明したように、本発明によれば、誤り訂正(FE
C)の冗長ビットに、端局でFECの演算を行った結果
と、中間中継局でのFECの演算結果との双方を含めて
伝送することにより、端局での回線品質監視に誤り訂正
(FEC)を用いて、符号誤り率検出時間を雉時間に行
うことができ、回線切替による回線障害の救済を数段率
めることができるという効果がある。[Effects of the Invention] As explained above, according to the present invention, the error correction (FE)
By transmitting both the FEC calculation result at the terminal station and the FEC calculation result at the intermediate relay station in the redundant bits of C), error correction ( FEC) can be used to detect the code error rate in a short period of time, which has the effect of making it possible to improve line failure by several steps by switching the line.
第1図は本発明に係る信号伝送方式の好適な実施例の構
成およびFECENCODERの信号の説明図、
第2図は従来の信号伝送方式の構成およびFECENC
ODERの信号の説明図である。
101:誤り訂正符号器
102:誤り訂正復号器
代理人 弁理士 渡 辺 喜 平FIG. 1 is an explanatory diagram of the configuration of a preferred embodiment of the signal transmission system according to the present invention and the FECENCODER signal. FIG. 2 is an explanatory diagram of the configuration of the conventional signal transmission system and the FECENCODER signal.
FIG. 2 is an explanatory diagram of an ODER signal. 101: Error correction encoder 102: Error correction decoder Representative Patent attorney Kihei Watanabe
Claims (1)
の符号化、復号化を行う信号伝送方式において、 端局で誤り訂正の演算を行った結果と、中間中継局で誤
り訂正を行った演算結果との双方を、誤り訂正用の冗長
ビットとして次局へ伝送することにより回線品質の監視
を行うことを特徴とする信号伝送方式。(1) In a signal transmission system in which each station performing digital wireless communication performs error correction encoding and decoding, the results of error correction calculations performed at the terminal station and the calculation results of error correction performed at intermediate relay stations. A signal transmission method characterized in that line quality is monitored by transmitting both of the information and the information to the next station as redundant bits for error correction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11698388A JPH01288031A (en) | 1988-05-16 | 1988-05-16 | Signal transmission system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11698388A JPH01288031A (en) | 1988-05-16 | 1988-05-16 | Signal transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01288031A true JPH01288031A (en) | 1989-11-20 |
Family
ID=14700587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11698388A Pending JPH01288031A (en) | 1988-05-16 | 1988-05-16 | Signal transmission system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01288031A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007325320A (en) * | 2007-09-10 | 2007-12-13 | Sumitomo Electric Ind Ltd | Relay apparatus and autonomous error correction network |
-
1988
- 1988-05-16 JP JP11698388A patent/JPH01288031A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007325320A (en) * | 2007-09-10 | 2007-12-13 | Sumitomo Electric Ind Ltd | Relay apparatus and autonomous error correction network |
JP4577341B2 (en) * | 2007-09-10 | 2010-11-10 | 住友電気工業株式会社 | Relay device and autonomous error correction network |
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