JPS615638A - Multi-direction multiplex radio communication system relayed to master station - Google Patents

Abstract

PURPOSE:To prevent deterioration in a code error rate characteristic even during the period without any burst signal by providing a scramble circuit to an input of a transmitter of a relay station directed to a master station and providing a de-scramble circuit to an output of a receiver of a master station. CONSTITUTION:A self-scramble circuit 27 is provided to an input of a transmitter 24 of the relay station 2 directed to the master station, and the de-scramble circuit 14 corresponding to the output of a receiver 13 is provided to the master station 1. A burst signal transmitted in a time slot assigned from slave stations 3A-3N is demodulated and reproduced, and the reproduced time division multiplex signal TDM is transmitted to the master station 1 through the self-scramble circuit 27. The master station 1 demodulates and reproduces the signal and uses the de-scramble circuit 14 operated reversely as the circuit 27 so as to restore the said signal into a base band signal, which is decoded by a code processing circuit 15 and the signal from the slave stations 3A-3N is restored separately.

Description

Translated fromJapanese

【発明の詳細な説明】〔技術分野〕本発明は多方向多重無線通信方式、特に各子局に対して
見通しの確保できる場所に設けられた中継局を介して親
局と複数の子局が時分割方式で通信を行う親局中継多方
向多重無線通信方式に関するＯ〔従来技術〕親局と複数の子局とが同一周波数の電波を時分割で使用
する多方向多重無線通信方式は、周波数を有効に使用で
きる経済的な端末無線通信系として注目され、準ミリ波
帯などの高い周波数帯を含めその適用分野が拡大しつつ
ある。マイクロ波帯以上の高い周波数では、電波の直進
性から送受信局間の見通しが要求されるが、立地条件に
よっては親局から各子局を見通すことが困難な場合があ
る。このようなとき経済的にシステムを構成する手段と
して、親局および各子局を見通せる場所にベースバンド
信号を復調再生して再送信するだけの簡単な再生中継機
能のみを持った中継局を設け、親局からの時分割多重（
ＴＤＭ）信号をこの中継局で再生中継し、例えば広角指
向性を持つアンテナから各子局に向けて放送形式で並列
に送信し、各子局がそれぞれ割当てられた異なったタイ
ムスロットで送信するバースト信号を受信して連続した
ＴＤＭ信号として親局に転送する親局中継多方向多重無
線通信方式が用いられている。この場合、各子局からの
バースト信号が連続じて存在し、中継局で受信する電波
に切目がない場合はよいが、電波を出さない子局があっ
てバースト信号の無いタイムスロットが存在すると、中
継局受信機の符号処理回路はこの無バースト信号の期間
中は雑音入力によってｕｌ”又は“０″′のいずれかを
出力するので、”１”の発生する確率（マーク率）が一
定せず変動する。ディジタル無線通信方式で娘、通常デ
ータ信号入力のない時で本マーク率が５０％となるよう
４にスクランブルをかけ、マーク率５０％のとき符号誤
９が最良となるよう調整されており、マーク率が変わる
と符号誤シが増加する。[Detailed Description of the Invention] [Technical Field] The present invention relates to a multi-directional multiplex wireless communication system, in particular, a system in which a master station and a plurality of slave stations are connected via a relay station installed in a place where line of sight can be secured for each slave station. O related to a master station relay multi-directional multiplex wireless communication system that communicates in a time-division manner It has attracted attention as an economical terminal wireless communication system that can effectively use radio waves, and its application fields are expanding to include high frequency bands such as the sub-millimeter wave band. At high frequencies above the microwave band, line-of-sight between transmitting and receiving stations is required due to the straightness of radio waves, but depending on location conditions, it may be difficult to see through each slave station from the master station. In such cases, as a means of economically configuring the system, a relay station with only a simple regenerative relay function that demodulates, reproduces, and retransmits the baseband signal is installed in a location where the master station and each slave station can be seen. , time division multiplexing from the master station (
TDM) signals are regenerated and relayed at this relay station, and are transmitted in parallel in broadcast format from an antenna with wide-angle directivity to each slave station, with each slave station transmitting in different assigned time slots. A master station relay multi-directional multiplex wireless communication system is used in which signals are received and transferred to the master station as continuous TDM signals. In this case, it is fine if the burst signals from each slave station exist continuously and there is no break in the radio waves received by the relay station, but if there are slave stations that do not emit radio waves and there are time slots without burst signals. During this non-burst signal period, the code processing circuit of the relay station receiver outputs either "ul" or "0"' due to noise input, so the probability of "1" occurring (mark rate) is constant. In digital wireless communication systems, normal mark rate is scrambled to 4 so that it is 50% when there is no data signal input, and adjustment is made so that code error 9 is the best when mark rate is 50%. Therefore, as the mark rate changes, the number of code errors increases.

従って、未建設の子局があったシ、子局が障害で電波を
送信しない期間があると、中継局から親局〜へ転送され
るＴＤＭ信号のマーク率が変動し１親局受信の符号誤シ
率特性が劣化する欠点がある。Therefore, if there is an unconstructed slave station, and if there is a period when the slave station does not transmit radio waves due to a failure, the mark rate of the TDM signal transferred from the relay station to the master station will fluctuate, and the code of one master station reception will change. There is a drawback that the error rate characteristics deteriorate.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、上述の欠点を簡単な回路を付加するこ
とによシ除去し、無バースト信号の期間があっても符号
誤シ率特性がはとんど劣化しない親局中継多方向多重無
線通信方式を提供することである。It is an object of the present invention to eliminate the above-mentioned drawbacks by adding a simple circuit, and to provide a master station relay multi-directional multiplexing system in which code error rate characteristics do not deteriorate at all even when there is a period of non-burst signals. The purpose is to provide a wireless communication method.

〔発明の構成〕[Structure of the invention]

本発明の親局中継多方向多重無線通信方式は、親局と複
数の子局との間に設けられた中継局が、前記親局から送
られたＴＤＭ信号を復調再生して前記各子局に向けて放
送形式で中継転送し、前記各子局からそれぞれ割当てら
れた異なったタイムスロットで送出されたバースト信号
を復調再生して前記親局にＴＤＭ信号として送出し、前
記親局と前記複数の子局とが時分割で通信を行う親局中
＋１継多方向多重無線通信方式において、前記中継局の前記
親局向は送信機の入力にセルフスクランブル方式のスク
ランブル回路を備え、前記親局の受信機の出力に前記ス
クランブル回路に対応するデスクランブル回路を備える
ことによって構成される。In the master station relay multi-directional multiplex wireless communication system of the present invention, a relay station provided between a master station and a plurality of slave stations demodulates and reproduces a TDM signal sent from the master station, and each of the slave stations The burst signals transmitted from each of the slave stations in different assigned time slots are demodulated and reproduced and sent to the master station as a TDM signal, and the burst signals are transmitted to the master station as a TDM signal. In the master station +1 relay multi-directional multiplex wireless communication system in which the relay station communicates with the slave stations in a time-division manner, the relay station facing the master station is equipped with a self-scrambling scrambling circuit at the input of a transmitter, A descrambling circuit corresponding to the scrambling circuit is provided at the output of the receiver.

〔実施例〕〔Example〕

次に図面を参照して本発明の詳細な説明する。Next, the present invention will be described in detail with reference to the drawings.

第１図は本発明の一実施例のブロック図で、親局ｌ、中
継局２．複数の子局ｓＡ、３Ｂ、・・・・・・３Ｎから
成シ、親局１は巣−ビームアンテナ１１．送信機α）１
２．受信機（６）１３．受信機の出力に挿入されたセル
フデスクランブル回路（ＤＥＣ）１４及び符号処理回路
１５で構成され、中継局２は親局と対向する単一ビーム
７ンテナ２１．各子局と対向する広角指向性アンテナ２
２．送信機αノ２３及び２４．−信機四２５及び２６．
受信機２５と送信機２４０間に挿入されたセルフスクラ
ンブル回路（８０Ｒ，）２７で構成されている。第１図
において、親局１から各子局に送られる信号は符号処理
回路１５で必要な付加ビットの挿入および時分割多重化
処理が行われ、送信機１２で周波数シフト（Ｆ８Ｋ　）
変調されて’Ｉ’ＤＭ信号として中継局２に送られる。FIG. 1 is a block diagram of an embodiment of the present invention, in which a master station 1, a relay station 2. Consisting of a plurality of slave stations sA, 3B, . . . 3N, the master station 1 has a nest-beam antenna 11. Transmitter α)1
2. Receiver (6)13. The relay station 2 consists of a self-descrambling circuit (DEC) 14 and a code processing circuit 15 inserted into the output of the receiver, and the relay station 2 has a single beam 7 antenna 21 . Wide-angle directional antenna 2 facing each slave station
2. Transmitter α 23 and 24. - Shinki 425 and 26.
It consists of a self-scrambling circuit (80R,) 27 inserted between the receiver 25 and the transmitter 240. In FIG. 1, a signal sent from a master station 1 to each slave station is subjected to insertion of necessary additional bits and time division multiplexing processing in a code processing circuit 15, and frequency shifted (F8K) by a transmitter 12.
It is modulated and sent to relay station 2 as an 'I' DM signal.

中継局２ではこのＴＤＭ信号を受信１ｍ２５で復調再生
し、送信機２３を再び変調して広角指向性アンテナ２２
から各子局３Ａ、３Ｂ、・・・・・・３Ｎに向けて放送
形式で並列に送信する。The relay station 2 demodulates and reproduces this TDM signal with a receiving 1m25, modulates the transmitter 23 again, and sends it to the wide-angle directional antenna 22.
The data is transmitted in parallel in broadcast format to each slave station 3A, 3B, . . . 3N.

各子局はこのＴＤＭ信号からタイミング基準信号全抽出
し、これを基準としてそれぞれ自局に割当てられたタイ
ムスロットの信号のみを抽出復号して利用し、又、割ｉ
てられたタイムスロットでバースト信号を送信する。中
継局２は各子局から時分割多元接続（ＴＤＭＡ’）方式
でそれぞれ異なった・タイムスロットで送られてくるバ
ースト信号を受信機２６で復調再生し、再生したＴＤＭ
信号１ｏＯをセルフスクランブル回路２７を通して送信
機２５に加え、親局１に送信する。親局１社この信号を
復調再生し、セルフスクランブル回路２７と逆の動作を
するセル７デスクランブル回路１４を通して中継局のベ
ースバンド信号１００と同じベースバンド信号を復元し
、符号処理回路５で復号処理して各子局からの信号を分
離復元する。Each slave station extracts the entire timing reference signal from this TDM signal, uses this as a reference, extracts and decodes only the signal of the time slot assigned to its own station, and uses the timing reference signal as a reference.
Send a burst signal in the designated time slot. The relay station 2 demodulates and reproduces the burst signals sent from each slave station in different time slots using the time division multiple access (TDMA') method using the receiver 26, and reproduces the reproduced TDM signals.
The signal 1oO is applied to the transmitter 25 through the self-scrambler circuit 27 and transmitted to the master station 1. One parent station demodulates and reproduces this signal, passes through the cell 7 descrambling circuit 14 which operates in the opposite manner to the self-scrambling circuit 27, restores the same baseband signal as the baseband signal 100 of the relay station, and decodes it in the code processing circuit 5. It processes and separates and restores the signals from each slave station.

各子局からのバースト信号Ａ、Ｅ、Ｃ，・・・・・・Ｎ
は第２図（ａ）のごとくそれぞれ異人りだタイムスロッ
トで送出され、中継局２では第２図（ｂ）のような周期
Ｔのはぼ連続した信号として受信される。このように連
続した信号が受信されている状態では、各バースト信号
は通常スクランブル処理されてマーク率５０％で送信さ
れてお・９、再生されたベーストバンド信号１００のマ
ーク率５０％となっている。しかしながら、子局３Ａ、
３Ｂ、・・・・・・３Ｎのうち、例えは３Ｂ、３Ｃが未
開局または障害のため電波を送信していない場合、第２
図（Ｃ）のようにバースト信号Ｂ、Ｃに対応するタイム
スロットｔが無バースト信号とな夛、この期間は受信機
２５の出力には雑音入力による復調出力を再生回路で判
定してｗｌ”又は０”のいずれかが出力されることとな
るので、マーク率５０％は保証されず出力はｕ１ｓ４又
は′ＩＯ”のいずれかに偏シ且つ不安定となる。従って
、これをそのまま送信機２４に加えて送出すると、親局
１の受信するＴＤＭ信号のマーク率が５０％からずれ、
復調および再生回路の動作中心点がずれて符号誤シが増
加する。Burst signals A, E, C,...N from each slave station
The signals are transmitted in different time slots as shown in FIG. 2(a), and are received at the relay station 2 as a nearly continuous signal with a period T as shown in FIG. 2(b). When continuous signals are being received in this way, each burst signal is normally scrambled and transmitted at a mark rate of 50%, and the reproduced baseband signal 100 has a mark rate of 50%. There is. However, slave station 3A,
Among 3B,...3N, for example, if 3B and 3C are not transmitting radio waves due to unopened stations or failures, the second
As shown in Figure (C), the time slot t corresponding to the burst signals B and C is a non-burst signal, and during this period, the output of the receiver 25 is determined by the reproducing circuit as the demodulated output due to the noise input. or 0'' will be output, so the mark rate of 50% is not guaranteed and the output will be biased towards either u1s4 or 'IO' and will be unstable. Therefore, this will be output as is to the transmitter 24. If the mark rate of the TDM signal received by master station 1 deviates from 50%,
The center of operation of the demodulation and regeneration circuits shifts, resulting in an increase in code errors.

第１図に示した本発明の構成で紘、これを防止するため
セルフスクランブル回路２７が設けられてオシ、ペース
トバンド信号１００に再度スクランブル操作を施してマ
ーク率をはは５０％として親局に送信するよう構成され
ている。親局ではセルフデスクランブル回路１４でこれ
を元に戻してベースバンド信号１００を復元し、Ｅ、Ｃ
を除く各バースト信号は符号処理回路１５で復号処理さ
れて正しい受信信号が得られる。In the configuration of the present invention shown in FIG. 1, a self-scramble circuit 27 is provided to prevent this, and the pasteband signal 100 is scrambled again to increase the mark rate to 50% and sent to the master station. configured to send. At the master station, the self-descrambling circuit 14 restores the baseband signal 100, and the E, C
Each burst signal except for the burst signal is decoded by the code processing circuit 15 to obtain a correct received signal.

第３図（ａ）及び（ｂ）はセルフスクランブル回路２７
及びセルフデスクランブル回路１４の一実施例のブロッ
ク図で、４段のシフトレジスタ４と半加算回路５を用い
た公知の回路である。この回路でシフトレジスタ４はフ
リップフロップＩＣ回路によシ、半加算回路５はＥＸ−
ＯＲ（排地的論理和）回路で容易に実現でき、極めて簡
単な構成で消費電力も僅かである。セルフスクランブル
方式は伝送区間で発生した符号誤）を若干増加させる（
第３図の回路では約３倍になる）欠点があるが・上述の
無バースト信号による符号誤シの劣化はこれよシはるか
に大きく、無バースト期間ｔの大きい場合にはｌＯの数
乗のオーダーに及ぶ。多方向多重無線通信方式は端末無
線通信系として将来の子局増加を考慮して建設され、当
初は無バースト信号のタイムスロットの多い状態で運用
されることが多く、従って、上述の方法は経済的で有効
な手段である。FIGS. 3(a) and 3(b) show the self-scramble circuit 27.
and a block diagram of an embodiment of the self-descrambling circuit 14, which is a known circuit using a four-stage shift register 4 and a half adder circuit 5. In this circuit, the shift register 4 is implemented by a flip-flop IC circuit, and the half adder circuit 5 is implemented by an EX-
It can be easily realized with an OR (or-exclusive OR) circuit, has an extremely simple configuration, and consumes little power. The self-scrambling method slightly increases the number of code errors that occur in the transmission section (
However, the deterioration of the code error caused by the above-mentioned non-burst signal is much larger than this, and when the non-burst period t is large, it increases by several times lO. It extends to orders. The multidirectional multiplex wireless communication system was constructed as a terminal wireless communication system in consideration of the future increase in slave stations, and was initially operated with many time slots of non-burst signals. Therefore, the above method is not economical. It is a practical and effective means.

上述の実施例では送受信機の構成が筒塔となるＦＳＫ変
調方式の場合について説明したが、Ｆ　８に以外の変調
方式を採用する場合でも一般に同様な問題があり、本発
明の技術思想を適用することができる。In the above embodiment, a case was explained in which the FSK modulation method is used in which the transmitter/receiver has a cylinder-tower configuration, but the same problem generally occurs even when modulation methods other than F8 are adopted, and the technical idea of the present invention is applied. can do.

（発明の効果〕以上詳細に説明したように、本発明の親局中継多方向多
重無線通信方式によれは、中継局にセルフスクランプ／
し回路を、親局にセルフチスクランブル回路を追加挿入
するのみで、子局からの電波に無バースト信号のタイム
スロットがあっても符号誤９の劣化がほとんど発生せず
、経済的に親局中継多方向多重無線通信方式を構成でき
る効果がある。(Effects of the Invention) As explained in detail above, the master station relay multidirectional multiplex wireless communication system of the present invention allows the relay station to perform self-scrambling and
By simply inserting a self-scrambling circuit into the master station, deterioration of code error 9 will hardly occur even if there is a time slot with no burst signal in the radio waves from the slave station, and the master station can be economically installed. This has the effect of configuring a relay multidirectional multiplex wireless communication system.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例のブロック図、第２図（ａＪ
　、　（ｂ）　、　（ｃ）は子局電波の状態の説明図、
第３図＋ａ）及び（ｂｌはセルフスクランブル回路およ
びセルフデスクランブル回路の一実施例のブロック図で
ある。１・・・・親局、２・・・・・・中継局、３Ａ＋３Ｂ＋
・・・・・・３Ｎ・・・・・・子局（ＴＲ）、４　　・
　シフトレジスタ、５・・・・半加算回路、１１，２１
．２２・・・・アンテナ、１２．２３．２４・・・・送
信機（Ｔ＋、１３，２５．２６・・受信根囲、１４・・
・・・セルフデスクランブル回路（ＤＥＣ）、　１５・
・・・・・符号処理回路、２７・・・・・セルフスクラ
ンブル回路（ＳＣＲ）。享　２　　ｆｆｉ華　　３　　図（α）FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 (aJ
, (b) and (c) are explanatory diagrams of the state of slave station radio waves,
Figures 3+a) and (bl) are block diagrams of an embodiment of a self-scramble circuit and a self-descramble circuit. 1... Master station, 2... Relay station, 3A+3B+
......3N...Slave station (TR), 4 ・
Shift register, 5... Half adder circuit, 11, 21
．． 22... Antenna, 12.23.24... Transmitter (T+, 13, 25.26... Receiving wall, 14...
...Self-descrambling circuit (DEC), 15.
... code processing circuit, 27 ... self-scramble circuit (SCR). Kyou 2 ffi Hana 3 Diagram (α)

Claims (1)

Translated fromJapanese

【特許請求の範囲】[Claims]親局と複数の子局との間に設けられた中継局が、前記親
局から送られた時分割多重信号を復調再生して前記各子
局に向けて放送形式で中継転送し、前記各子局からそれ
ぞれ割当てられた異なったタイムスロットで送出された
バースト信号を復調再生して前記親局に時分割多重信号
として送出し、前記親局と前記複数の子局とが時分割で
通信を行う親局中継多方向多重無線通信方式において、
前記中継局の前記親局向け送信機の入力にセルフスクラ
ンブル方式のスクランブル回路を備え、前記親局の受信
機の出力に前記スクランブル回路に対応するデススクラ
ンブル回路を備えたことを特徴とする親局中継多方向多
重無線通信方式。A relay station provided between a master station and a plurality of slave stations demodulates and reproduces the time-division multiplexed signal sent from the master station, and relays the demodulated signal to each of the slave stations in broadcast format. The burst signals transmitted from the slave stations in different time slots respectively assigned are demodulated and reproduced and sent to the master station as time-division multiplexed signals, and the master station and the plurality of slave stations communicate in a time-division manner. In the master station relay multidirectional multiplex wireless communication system,
A master station characterized in that the input of the transmitter for the master station of the relay station is equipped with a self-scrambling scrambling circuit, and the output of the receiver of the master station is equipped with a descrambling circuit corresponding to the scramble circuit. Relay multidirectional multiplex wireless communication system.