JP3508061B2 - Non line-of-sight communication system - Google Patents
Non line-of-sight communication systemInfo
- Publication number
- JP3508061B2 JP3508061B2 JP2000356843A JP2000356843A JP3508061B2 JP 3508061 B2 JP3508061 B2 JP 3508061B2 JP 2000356843 A JP2000356843 A JP 2000356843A JP 2000356843 A JP2000356843 A JP 2000356843A JP 3508061 B2 JP3508061 B2 JP 3508061B2
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- line
- communication system
- sight communication
- station
- distortion
- Prior art date
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- Detection And Prevention Of Errors In Transmission (AREA)
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Radio Transmission System (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は見通し外通信システ
ムに関し、特に異常伝搬時に実施される対向局への緊急
送信出力の制御方式の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-line-of-sight communication system, and more particularly to an improvement of a control system for emergency transmission output to an opposite station which is carried out during abnormal propagation.
【０００２】[0002]
【従来の技術】従来、見通し外通信システムにおいて
は、ＡＧＣ（受信入力レベル）と、ＢＥＲ＃１（無線区
間の符号誤り）と、ＢＥＲ＃２（端末区間の符号誤り）
とを監視し、対向局送信出力電力をレンジ＃１〜＃ｎの
ｎ段階に自動制御している。2. Description of the Related Art Conventionally, in a non-line-of-sight communication system, AGC (reception input level), BER # 1 (radio section code error), and BER # 2 (terminal section code error).
And the output power of the opposite station is automatically controlled in n steps of ranges # 1 to #n.
【０００３】また、対向局の送信出力電力が最小（レン
ジ＃ｎ状態）であるにもかかわらず、異常伝搬（ダクト
発生等）によって、受信入力レベルが異常に上昇した場
合には、図４及び図５に示すように、隣接回線への干渉
波の抑圧のため、緊急対応として送信電力を最小レンジ
＃ｎより更に約ｙｄＢ（任意固定）下げる緊急送信出力
制御を採用している。Further, when the reception input level abnormally rises due to abnormal propagation (such as duct generation) even though the transmission output power of the opposite station is the minimum (range #n state), FIG. As shown in FIG. 5, in order to suppress the interference wave to the adjacent line, the emergency transmission output control for further reducing the transmission power by about y dB (arbitrarily fixed) from the minimum range #n is adopted as an emergency measure.
【０００４】図４において、与干渉局であるＡ局の送信
周波数ｆＡと、被干渉局であるＣ局の受信周波数ｆＤと
が非常に接近しており、かつＡ局〜Ｂ局（Ｃ局）間で異
常伝搬が発生した場合、Ｃ局の受信周波数ｆＤに対して
Ａ局の送信周波数ｆＡが干渉波となる。In FIG. 4, the transmission frequency fA of station A, which is the interfering station, and the reception frequency fD of station C, which is the interfered station, are very close to each other, and stations A to B (station C). When abnormal propagation occurs between stations, the transmission frequency fA of station A becomes an interference wave with respect to the reception frequency fD of station C.
【０００５】この従来の見通し外通信システムの構成を
図６に示す。図６において、従来の見通し外通信システ
ムではＡ局の監視制御装置９がＢ局からの受信波の受信
入力レベル（ＡＧＣ）と無線区間の符号誤り（ＢＥＲ＃
１）と端末区間の符号誤り（ＢＥＲ＃２）とを監視し、
その監視結果を対向するＢ局の監視制御装置１０に通知
している。The configuration of this conventional non-line-of-sight communication system is shown in FIG. Referring to FIG. 6, in the conventional non-line-of-sight communication system, the supervisory controller 9 of the A station receives the received input level (AGC) of the received wave from the B station and the code error (BER # in the wireless section).
1) and the code error (BER # 2) in the terminal section are monitored,
The monitoring result is notified to the monitoring control device 10 of the opposite station B.
【０００６】Ｂ局の監視制御装置１０は自局の電力増幅
装置８の前段の電力増幅器２２の手前に設置している可
変減衰器２１を用い、送信電力をレンジ＃１〜＃ｎのｎ
段階（固定）に自動制御している。The monitoring control apparatus 10 of the B station uses a variable attenuator 21 installed in front of the power amplifier 22 in the preceding stage of the power amplification apparatus 8 of its own station, and the transmission power is n in the range # 1 to #n.
The stage (fixed) is automatically controlled.
【０００７】また、異常伝搬時の対応としては電力増幅
器２３と電力増幅器２４との間の切替えスイッチ２６で
ｙｄＢの固定減衰器８１を挿入することによって、レン
ジ#nよりさらに約ｙｄＢ（任意固定）下げる制御（Ｂ局
の監視制御装置１０からの手動でのみ）を行えるように
している。Further, as a measure against abnormal propagation, by inserting a fixed attenuator 81 of ydB with the changeover switch 26 between the power amplifier 23 and the power amplifier 24, about ydB (arbitrary fixed) further than the range #n. The lowering control (only manually from the supervisory control device 10 of the B station) can be performed.
【０００８】尚、図６において、Ａ局のダウンコンバー
タ７とＢ局の電力増幅装置８との間ではバンドパスフィ
ルタ３，４を介して信号の送受信を行っており、電力増
幅装置８の可変減衰器２１には可変抵抗Ｒ１〜Ｒｎとプ
ルアップ抵抗Ｒｎ＋１とスイッチＳ１〜Ｓｎとが接続さ
れている。In FIG. 6, signals are transmitted and received between the down converter 7 of station A and the power amplification device 8 of station B via bandpass filters 3 and 4, and the power amplification device 8 is variable. Variable resistors R1 to Rn, pull-up resistors Rn + 1, and switches S1 to Sn are connected to the attenuator 21.
【０００９】また、ダウンコンバータ７は増幅器１１，
１４と、バンドパスフィルタ１２と、ミキサ回路（ＭＩ
Ｘ）１３と、発振器１５と、分周器（ｆ／ｎｆ）１６と
から構成されている。The down converter 7 includes an amplifier 11,
14, a bandpass filter 12, and a mixer circuit (MI
X) 13, an oscillator 15, and a frequency divider (f / nf) 16.
【００１０】尚、上述したような方法、つまり受信機で
検出した情報を基に相手局送信出力レベルを制御する方
式については、特開平５−１２２１２５号公報等に開示
されている。The above-mentioned method, that is, the method of controlling the transmission output level of the partner station based on the information detected by the receiver is disclosed in Japanese Patent Laid-Open No. 5-122125.
【００１１】[0011]
【発明が解決しようとする課題】上記のような緊急送信
出力制御の実施は、隣接回線への干渉波抑制以外に自局
受信入力レベルの最適化手段としての要素をも持ってい
る。受信入力レベルが上限目安値を超えた場合には、受
信入力レベルを下げる必要があるため、上記の緊急送信
出力制御を実施するが、二重ダイバシティ回線の場合
（空間ダイバシティまたは周波数ダイバシティ）、異常
伝搬の程度によっては上記の緊急送信出力制御を実施す
ると、受信入力レベルが回線設計下限に近づき最悪の場
合、回線断となる場合があるという問題がある。尚、こ
こでいう受信入力レベル上限値とはダウンコンバータの
レベルダイヤ上、アンプが飽和してＢＥＲ（ビット誤り
率）特性が悪くなることによって決まる目安値である。The implementation of the emergency transmission output control as described above has an element as a means for optimizing the reception input level of the own station in addition to suppressing the interference wave to the adjacent line. If the received input level exceeds the upper limit standard value, it is necessary to lower the received input level, so the above emergency transmission output control is carried out, but in the case of a dual diversity line (spatial diversity or frequency diversity), it is abnormal. Depending on the degree of propagation, if the above-mentioned emergency transmission output control is carried out, the reception input level approaches the line design lower limit, and in the worst case, the line may be disconnected. The reception input level upper limit value here is a reference value determined by the saturation of the amplifier and deterioration of the BER (bit error rate) characteristic on the level diagram of the down converter.
【００１２】そこで、本発明の目的は上記の問題点を解
消し、二重ダイバシティ回線での緊急送信出力制御実施
による回線断の恐れを解消することができる見通し外通
信システムを提供することにある。Therefore, an object of the present invention is to provide a non-line-of-sight communication system that solves the above problems and can eliminate the risk of line disconnection due to the implementation of emergency transmission output control in a dual diversity line. .
【００１３】[0013]
【課題を解決するための手段】本発明による見通し外通
信システムは、受信入力レベルと無線区間の符号誤りと
端末区間の符号誤りとを監視し、対向局の送信出力電力
を制御する見通し外通信システムであって、異常伝搬時
の対策として実施する緊急送信出力制御において前記対
向局の送信機の減衰値を可変する可変減衰器を備えてい
る。A non-line-of-sight communication system according to the present invention monitors a reception input level, a code error in a radio section and a code error in a terminal section and controls a transmission output power of an opposite station. The system is provided with a variable attenuator for varying the attenuation value of the transmitter of the opposite station in emergency transmission output control executed as a measure against abnormal propagation.
【００１４】すなわち、本発明の見通し外通信システム
は、緊急送信出力制御の減衰値を可変とし、またその減
衰量をＢＥＲ（ビット誤り率）特性の検出によらず、受
信機のダウンコンバータ出力の歪み成分を検出する歪み
予測回路を設け、歪み予測回路で予測されるダウンコン
バータの歪み成分を基に最適値に自動設定している。That is, in the non-line-of-sight communication system of the present invention, the attenuation value of the emergency transmission output control is made variable, and the attenuation amount of the down converter output of the receiver does not depend on the detection of the BER (bit error rate) characteristic. A distortion prediction circuit for detecting the distortion component is provided, and the optimum value is automatically set based on the distortion component of the down converter predicted by the distortion prediction circuit.
【００１５】上記のように、緊急送信出力制御時の減衰
量を可変にすることによって、従来のｙｄＢ（任意固
定）では大きすぎる場合にも最適な減衰値設定が可能と
なり、二重ダイバシティ回線での回線断の恐れを解消す
ることが可能となる。As described above, by varying the attenuation amount during the emergency transmission output control, the optimum attenuation value can be set even when the conventional ydB (fixed arbitrary) is too large, and the dual diversity line is used. It is possible to eliminate the risk of line disconnection.
【００１６】また、ダウンコンバータ出力の歪み予測回
路を設けることによって、ダウンコンバタへの過入力状
態判定を可能とし、運用上の許容受信入力レベル上限付
近での緊急送信出力制御が可能となる。Further, by providing a distortion predicting circuit for the down converter output, it becomes possible to judge the over-input state to the down converter, and it becomes possible to perform the emergency transmission output control near the upper limit of the allowable reception input level in operation.
【００１７】[0017]
【発明の実施の形態】次に、本発明の一実施例について
図面を参照して説明する。図１は本発明の一実施例によ
る見通し外通信システムの構成を示すブロック図であ
る。図１において、本発明の一実施例による見通し外通
信システムはＡ局及びＢ局からなり、Ａ局はダウンコン
バータ１とバンドパスフィルタ３と監視制御装置５とを
備え、ダウンコンバータ１は増幅器１１，１４と、バン
ドパスフィルタ１２と、ミキサ回路（ＭＩＸ）１３と、
発振器１５と、分周器（ｆ／ｎｆ）１６と、歪み予測回
路１７とから構成されている。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a non-line-of-sight communication system according to an embodiment of the present invention. 1, a non-line-of-sight communication system according to an embodiment of the present invention includes stations A and B. Station A includes a down converter 1, a bandpass filter 3, and a supervisory controller 5, and the down converter 1 includes an amplifier 11. , 14, a bandpass filter 12, a mixer circuit (MIX) 13,
The oscillator 15 includes a frequency divider (f / nf) 16 and a distortion prediction circuit 17.
【００１８】Ｂ局は電力増幅装置２とバンドパスフィル
タ４と監視制御装置６とを備え、電力増幅装置２は可変
減衰器（ダイオード減衰器）２１，２５と、電力増幅器
２２，２３と、バイアス回路２４と、切替えスイッチ２
６とから構成され、可変減衰器２１には可変抵抗Ｒ１〜
Ｒｎとプルアップ抵抗Ｒｎ＋１とスイッチＳ１〜Ｓｎと
が接続されている。Station B comprises a power amplifier 2, a bandpass filter 4, and a monitor controller 6. The power amplifier 2 has variable attenuators (diode attenuators) 21, 25, power amplifiers 22, 23, and a bias. Circuit 24 and changeover switch 2
The variable attenuator 21 includes variable resistors R1 to R1.
Rn, pull-up resistor Rn + 1, and switches S1 to Sn are connected.
【００１９】以下、Ｂ局が送信、Ａ局が受信の場合につ
いて説明する。受信側のＡ局にはダウンコンバータ１の
出力にダウンコンバータ１の歪み成分を検出する歪み予
測回路１７が設置され、監視制御装置５は歪み予測回路
１７で検出された歪み成分を基に最適な緊急送信出力制
御減衰量の制御を行う。The case where station B is transmitting and station A is receiving will be described below. A distortion prediction circuit 17 for detecting the distortion component of the down converter 1 is installed at the output of the down converter 1 in the A station on the receiving side, and the monitoring control device 5 is optimal based on the distortion component detected by the distortion prediction circuit 17. Emergency transmission output control Attenuation control.
【００２０】送信側のＢ局には受信局の監視制御信号を
受ける監視制御装置６と、緊急送信出力制御の減衰量を
設定する可変減衰器２５と、可変減衰器２５のバイアス
を決定するバイアス回路２４と、可変減衰器２５を挿入
するための切替えスイッチ２６とを備えている。The station B on the transmitting side receives the supervisory control signal from the receiving station, the supervisory controller 6, the variable attenuator 25 for setting the attenuation amount for the emergency transmission output control, and the bias for determining the bias of the variable attenuator 25. The circuit 24 and the changeover switch 26 for inserting the variable attenuator 25 are provided.
【００２１】本実施例は従来の技術の固定減衰器８１を
可変減衰器２５とし、またＡ局受信機のダウンコンバー
タ１の出力に歪み予測回路１７を設けた以外は従来の技
術と同様の構成となっている。In this embodiment, the fixed attenuator 81 of the prior art is the variable attenuator 25, and the distortion predicting circuit 17 is provided at the output of the down converter 1 of the A station receiver. Has become.
【００２２】上記の構成とすることで、本実施例では予
めＢＥＲ（ビット誤り率）特性が劣化する歪み量を歪み
予測回路１７で測定しておき、その歪み量を監視制御装
置５を介して対向するＢ局の監視制御装置６に通知す
る。監視制御装置６はその歪み量に応じて電力増幅装置
２の可変減衰器２５の減衰量を、バイアス回路２４のバ
イアス電圧を可変することで制御するようにしている。With the above-described configuration, in this embodiment, the distortion amount that deteriorates the BER (bit error rate) characteristic is measured in advance by the distortion prediction circuit 17, and the distortion amount is sent via the monitor control device 5. The monitoring control device 6 of the opposite station B is notified. The monitoring control device 6 controls the attenuation amount of the variable attenuator 25 of the power amplification device 2 by varying the bias voltage of the bias circuit 24 according to the distortion amount.
【００２３】すなわち、本実施例では緊急送信出力制御
を実施した場合、Ｂ局の可変減衰器２５の減衰量が、Ａ
局の歪み予測回路１７で検出した歪み量によって最適な
減衰量となるように、監視制御装置５，６によって自動
設定することができる。That is, in the present embodiment, when the emergency transmission output control is performed, the attenuation amount of the variable attenuator 25 of the B station is A
The monitoring control devices 5 and 6 can automatically set the optimum attenuation amount according to the distortion amount detected by the distortion prediction circuit 17 of the station.
【００２４】図２はＱＰＳＫ（Ｑｕａｄｒａｔｕｒｅ
Ｐｈａｓｅ Ｓｈｉｆｔ Ｋｅｙｉｎｇ）のスペクトラ
ム特性を示す図であり、図３は３次相互変調歪み特性を
示す図である。これら図１〜図３を参照して本発明の一
実施例による無線通信システムについて説明する。FIG. 2 shows QPSK (Quadrature).
FIG. 3 is a diagram showing a spectrum characteristic of Phase Shift Keying, and FIG. 3 is a diagram showing a third-order intermodulation distortion characteristic. A wireless communication system according to an embodiment of the present invention will be described with reference to FIGS.
【００２５】歪み予測回路１７の動作について図２に示
すＱＰＳＫのスペクトラム特性を用いて説明する。ダウ
ンコンバータ１を飽和点に近いレベルダイヤ（異常伝搬
時の入力状況）で動作させ場合、図２に示すように、ｆ
Ｔ＝１．５付近に３次相互変調歪みによる持ち上がり、
またｆＴ＝２．５付近に５次相互変調歪みによるスペク
トラムの持ち上がりが生じる。The operation of the distortion prediction circuit 17 will be described using the spectrum characteristics of QPSK shown in FIG. When the down converter 1 is operated at a level diagram close to the saturation point (input state during abnormal propagation), as shown in FIG.
Lifted due to third-order intermodulation distortion near T = 1.5,
In addition, a spectrum rises due to fifth-order intermodulation distortion near fT = 2.5.
【００２６】持ち上がり部分のエネルギ量としては３次
のものが支配的となる。この持ち上がり部分がダウンコ
ンバータ１の歪み成分となる。歪み予測回路１７ではこ
れらの持ち上がり部分を増幅器１４の入力と出力との差
分をとることによって歪み成分として検出している。具
体的な技術については、リニアライザ等で用いられてい
る入力と出力との差分を検出する技術が転用可能である
ので、その説明については省略する。The third-order energy is dominant as the amount of energy in the lifted portion. This raised portion becomes a distortion component of the down converter 1. The distortion prediction circuit 17 detects these rising portions as distortion components by calculating the difference between the input and output of the amplifier 14. As a specific technique, a technique for detecting a difference between an input and an output, which is used in a linearizer or the like, can be diverted, and thus the description thereof will be omitted.
【００２７】尚、本実施例ではダウンコンバータ１の最
終段の増幅器１４の入力と出力とを差し引く方式を示し
ているが、図２に示すように、３次歪み及び５次歪みの
ＱＰＳＫスペクトラム上の周波数関係が明らかなため、
増幅器１４の出力に３次歪み及び５次歪みのみを通過さ
せるバンドパスフィルタを設置して歪み成分を検出する
方法を用いてもよい。Although the present embodiment shows a method of subtracting the input and output of the final stage amplifier 14 of the down converter 1, as shown in FIG. 2, on the QPSK spectrum of third-order distortion and fifth-order distortion. Since the frequency relationship of is clear,
A method of detecting a distortion component by installing a bandpass filter that passes only the third-order distortion and the fifth-order distortion at the output of the amplifier 14 may be used.
【００２８】このように、緊急送信出力制御時の減衰量
を可変にすることによって、従来のｙｄＢ（任意固定）
では大きすぎる場合にも最適な減衰値を設定することが
でき、二重ダイバシティ回線での回線断の恐れを解消す
ることができる。As described above, by changing the attenuation amount during the emergency transmission output control, the conventional ydB (fixed arbitrarily)
With, it is possible to set the optimum attenuation value even if it is too large, and it is possible to eliminate the risk of line disconnection in a dual diversity line.
【００２９】また、ダウンコンバータ１の出力の歪み成
分を検出する歪み予測回路１７を設けることによって、
ダウンコンバタ１への過入力状態を判定することがで
き、運用上の許容受信入力レベル上限付近での緊急送信
出力制御を行うことができる。Further, by providing the distortion prediction circuit 17 for detecting the distortion component of the output of the down converter 1,
It is possible to determine an excessive input state to the down converter 1, and it is possible to perform emergency transmission output control near the upper limit of the allowable reception input level in operation.
【００３０】さらに、図３に示すように、３次相互変調
歪みの入出力特性は傾きが３（入力１に対して出力３の
関係）であり、歪み量を受信入力レベルで校正するより
も３次相互変調歪みを用いた方がレスポンスが早いとい
うメリットもある。Further, as shown in FIG. 3, the input / output characteristic of the third-order intermodulation distortion has a slope of 3 (relationship between input 1 and output 3), and rather than calibrating the distortion amount at the reception input level. Using the third-order intermodulation distortion also has the advantage of faster response.
【００３１】尚、本発明は上述した実施例に限定され
ず、本発明の技術思想の範囲内において、実施例は適宜
変更され得ることは明らかである。It should be noted that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately modified within the scope of the technical idea of the present invention.
【００３２】[0032]
【発明の効果】以上説明したように本発明によれば、受
信入力レベルと無線区間の符号誤りと端末区間の符号誤
りとを監視し、対向局の送信出力電力を制御する見通し
外通信システムにおいて、異常伝搬時の対策として実施
する緊急送信出力制御において対向局の送信機の減衰値
を可変する可変減衰器を設けることによって、二重ダイ
バシティ回線での緊急送信出力制御実施による回線断の
恐れを解消することができるという効果がある。As described above, according to the present invention, in the non-line-of-sight communication system for monitoring the reception input level, the code error in the wireless section and the code error in the terminal section and controlling the transmission output power of the opposite station. By providing a variable attenuator that varies the attenuation value of the transmitter of the opposite station in emergency transmission output control implemented as a countermeasure against abnormal propagation, there is a risk of line disconnection due to implementation of emergency transmission output control on dual diversity lines. The effect is that it can be resolved.
【図１】本発明の一実施例による見通し外通信システム
の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of a non-line-of-sight communication system according to an embodiment of the present invention.
【図２】ＱＰＳＫのスペクトラム特性を示す図である。FIG. 2 is a diagram showing spectrum characteristics of QPSK.
【図３】３次相互変調歪み特性を示す図である。FIG. 3 is a diagram showing third-order intermodulation distortion characteristics.
【図４】従来の送信出力電力制御を示す状態遷移図であ
る。FIG. 4 is a state transition diagram showing conventional transmission output power control.
【図５】隣接回線への干渉波抑圧を示す説明図である。FIG. 5 is an explanatory diagram showing interference wave suppression to an adjacent line.
【図６】従来の見通し外通信システムの構成を示すブロ
ック図である。FIG. 6 is a block diagram showing a configuration of a conventional non-line-of-sight communication system.
１ ダウンコンバータ ２ 電力増幅装置 ３，４，１２ バンドパスフィルタ ５，６ 監視制御装置 １１，１４ 増幅器 １３ ミキサ回路 １５ 発振器 １６ 分周器 １７ 歪み予測回路 ２１，２５ 可変減衰器 ２２，２３ 電力増幅器 ２４ バイアス回路 ２６ 切替えスイッチ 1 down converter 2 power amplifier 3,4,12 band pass filter 5,6 Supervisory control device 11,14 Amplifier 13 mixer circuit 15 oscillator 16 frequency divider 17 Distortion prediction circuit 21,25 Variable attenuator 22,23 Power amplifier 24 bias circuit 26 Changeover switch
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｌ 1/00 Ｈ０４Ｌ 1/00 Ｅ 27/22 27/22 Ａ (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 1/04 H04B 1/18 H04B 7/06 H04B 7/12 H04L 27/22 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 identification code FI H04L 1/00 H04L 1/00 E 27/22 27/22 A (58) Fields investigated (Int.Cl. 7 , DB name) H04B 1/04 H04B 1/18 H04B 7/06 H04B 7/12 H04L 27/22
Claims (3)
端末区間の符号誤りとを監視し、対向局の送信出力電力
を制御する見通し外通信システムであって、異常伝搬時
の対策として実施する緊急送信出力制御において前記対
向局の送信機の減衰値を可変する可変減衰器を有するこ
とを特徴とする見通し外通信システム。1. A non-line-of-sight communication system for monitoring a reception input level, a code error in a wireless section and a code error in a terminal section and controlling a transmission output power of an opposite station, which is implemented as a countermeasure against abnormal propagation. A non-line-of-sight communication system having a variable attenuator for varying the attenuation value of the transmitter of the opposite station in emergency transmission output control.
適な減衰量に制御するようにしたことを特徴とする請求
項１記載の見通し外通信システム。2. The non-line-of-sight communication system according to claim 1, wherein the variable attenuator is controlled to an optimum amount of attenuation according to a line condition.
力電界の上昇によるビット誤り率の代替え特性としてデ
ィジタル変調波自身による相互変調成分を用いるように
したことを特微とする請求項１または請求項２記載の見
通し外通信システム。3. When controlling the variable attenuator, the intermodulation component by the digital modulation wave itself is used as a substitute characteristic of the bit error rate due to the rise of the reception input electric field. Alternatively, the non-line-of-sight communication system according to claim 2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000356843A JP3508061B2 (en) | 2000-11-24 | 2000-11-24 | Non line-of-sight communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000356843A JP3508061B2 (en) | 2000-11-24 | 2000-11-24 | Non line-of-sight communication system |
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| Publication Number | Publication Date |
|---|---|
| JP2002164798A JP2002164798A (en) | 2002-06-07 |
| JP3508061B2 true JP3508061B2 (en) | 2004-03-22 |
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| JP2000356843A Expired - Lifetime JP3508061B2 (en) | 2000-11-24 | 2000-11-24 | Non line-of-sight communication system |
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| JP5279037B2 (en) | 2010-04-28 | 2013-09-04 | 日本電気株式会社 | Wireless communication apparatus, wireless network system, and data link construction method used therefor |
| WO2023199467A1 (en) * | 2022-04-14 | 2023-10-19 | 日本電信電話株式会社 | Radio communication method, radio communication system, transmission device, and reception device |
| CN114611415B (en) * | 2022-05-11 | 2022-08-12 | 中国海洋大学 | Beyond-visual-range propagation loss prediction method based on SL-TrellisNets network |
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