JPH0754916B2 - SSB communication method - Google Patents
SSB communication methodInfo
- Publication number
- JPH0754916B2 JPH0754916B2 JP10943885A JP10943885A JPH0754916B2 JP H0754916 B2 JPH0754916 B2 JP H0754916B2 JP 10943885 A JP10943885 A JP 10943885A JP 10943885 A JP10943885 A JP 10943885A JP H0754916 B2 JPH0754916 B2 JP H0754916B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplitude
- ssb
- output
- carrier
- 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.)
- Expired - Fee Related
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
- H04B1/68—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 for wholly or partially suppressing the carrier or one side band
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、SSB通信方式の制御に関するもので、特に陸
上移動通信等のフェージングが存在する環境において
も、高品質な信号伝送を行なうことが可能なSSB通信方
式に係るものである。Description: TECHNICAL FIELD The present invention relates to control of an SSB communication system, and can perform high-quality signal transmission even in an environment where fading such as land mobile communication exists. It relates to possible SSB communication methods.
〔従来の技術〕 SSB信号を用いた通信方式は、狭帯域伝送が可能であり
周波数有効利用の点で優れた通信方式であるが、陸上移
動通信のように送受信間の信号伝搬環境が大きく変動す
る条件下ではフェージングによって振幅歪を受け伝送品
質から劣化するという問題点がある。[Prior art] The communication method using SSB signals is a communication method that is capable of narrow band transmission and is effective in effective use of frequency, but the signal propagation environment between transmission and reception fluctuates greatly like land mobile communication. Under the above condition, there is a problem that the transmission quality is deteriorated due to amplitude distortion due to fading.
従来、この問題点を解決する一つの方法として、特願昭
59−259354号によるところの、送信側は搬送波を付加し
たSSB信号を送信信号として用い、受信側では受信信号
を振幅制限してから、振幅制限出力の時間間隔に比例す
る振幅を有する信号を発生させ振幅情報を復元させた
後、再生搬送波によって乗積検波復調する方法があっ
た。Conventionally, as one method for solving this problem,
According to 59-259354, the transmitting side uses an SSB signal with a carrier added as the transmitting signal, and the receiving side limits the amplitude of the received signal and then generates a signal having an amplitude proportional to the time interval of the amplitude limited output. Then, after the amplitude information is restored, there is a method in which the product detection demodulation is performed by the reproduced carrier wave.
上述した、従来の、送信側から搬送波を付加したSSB信
号を送信信号として送出して、受信側では受信信号を振
幅制限してから、振幅制限出力の時間間隔に比例する振
幅を有する信号を発生させ振幅情報を復元させた後、再
生搬送波によって乗積検波復調する方法においては、乗
積検波を行なうために、フェージングが存在する場合に
も安定に動作する搬送波再生回路が必要であり、受信機
構成が複雑化するという問題点があった。The above-mentioned conventional SSB signal with a carrier added from the transmission side is sent as a transmission signal, and the reception side limits the amplitude of the received signal, and then generates a signal having an amplitude proportional to the time interval of the amplitude limited output. In the method of performing the product detection demodulation using the reproduced carrier after restoring the amplitude information, a carrier recovery circuit that operates stably even in the presence of fading is required to perform the product detection. There was a problem that the composition became complicated.
本発明は、このような従来の問題点に鑑み、受信側で振
幅制限された受信信号の時間間隔に比例する振幅を有す
る信号を発生させ振幅情報を復元させた後、包絡線検波
復調することにより、搬送波再生を不要としたもので、
フェージングによる影響が少なく、かつ、簡潔な構成の
受信機で実現することができるSSB通信方式を提供する
ことを目的としている。In view of such conventional problems, the present invention performs envelope detection demodulation after generating a signal having an amplitude proportional to the time interval of a reception signal whose amplitude is limited on the receiving side and restoring the amplitude information. By this, carrier wave reproduction is unnecessary,
It is an object of the present invention to provide an SSB communication method which is less affected by fading and can be realized by a receiver having a simple structure.
本発明は上述の目的を達成するため特許請求の範囲に記
載した手段を有する構成の送受信部によりSSB通信を行
なうものである。In order to achieve the above-mentioned object, the present invention performs SSB communication by a transmission / reception unit having a structure described in the claims.
すなわち、受信側においてフェージング等によって生ず
る振幅の急激な落ち込みに対応するため振幅制限器を用
いて一定振幅とし、さらに振幅制限出力の時間間隔に比
例する振幅を有する信号を発生させ振幅情報を復元させ
たのち包絡線検波によって、復調信号を得るものであっ
て、送信側でSSB信号に搬送波信号を付加した信号を送
信信号とすることにより、受信側での振幅制限器の使用
を可能としている。That is, in order to cope with a sharp drop in the amplitude caused by fading on the receiving side, an amplitude limiter is used to make the amplitude constant, and a signal having an amplitude proportional to the time interval of the amplitude limited output is generated to restore the amplitude information. After that, a demodulated signal is obtained by envelope detection, and by using a signal obtained by adding a carrier signal to the SSB signal on the transmitting side as a transmitting signal, the amplitude limiter can be used on the receiving side.
本発明の方式においては、従来方式の受信側において必
要とされていた搬送波再生回路が不要である。The system of the present invention does not require a carrier recovery circuit which was required on the receiving side of the conventional system.
以下、本発明の構成等に関し、一実施例の図面を用いて
詳細に説明する。Hereinafter, the configuration and the like of the present invention will be described in detail with reference to the drawings of an embodiment.
第１図は本発明の一実施例の送受信部を示すブロック図
であって、１は変調信号入力端子、２は搬送波発振器、
３はSSB変調器、４は加算回路、５は送信機、６は送信
アンテナ、７は送信部、８は受信アンテナ、９は受信
機、10は振幅制限器、11は鋸歯状波発生回路、12はバン
ドパスフィルタ、13は包絡線検波器、14は復調信号出力
端子、15は受信部を表わしている。FIG. 1 is a block diagram showing a transmission / reception unit of an embodiment of the present invention, in which 1 is a modulation signal input terminal, 2 is a carrier wave oscillator,
3 is an SSB modulator, 4 is an adder circuit, 5 is a transmitter, 6 is a transmitting antenna, 7 is a transmitting unit, 8 is a receiving antenna, 9 is a receiver, 10 is an amplitude limiter, 11 is a sawtooth wave generation circuit, Reference numeral 12 is a bandpass filter, 13 is an envelope detector, 14 is a demodulated signal output terminal, and 15 is a receiver.
第１図に示した実施例について信号の流れに従って動作
を説明する。The operation of the embodiment shown in FIG. 1 will be described according to the signal flow.
送信部７では、変調信号入力端子１に入力された帯域制
限された音声信号副搬送波を用いた変調信号等の情報信
号により搬送波発振器２の出力をSSB変調器３で変調し
て下側帯波SSB変調波を生成する。SSB変調波の生成に
は、フィルタ法、移送法等周知の方法を用いればよい。In the transmitter 7, the output of the carrier oscillator 2 is modulated by the SSB modulator 3 by the information signal such as the modulation signal using the band-limited audio signal subcarrier input to the modulation signal input terminal 1 to generate the lower sideband SSB. Generate a modulated wave. A known method such as a filter method or a transfer method may be used to generate the SSB modulated wave.
SSB変調器３の出力と搬送波発振器２の出力を加算回路
４により加算して、その出力として搬送波を付加された
SSB信号を得る。加算回路４の出力は送信機５によりア
ップコンバート・電力増幅されたのち所望の周波数およ
び電力で送信アンテナ６から放射される。受信部15で
は、受信アンテナ８により受信された信号は受信機９に
よりダウンコンバートおよび増幅された後振幅制限器10
に入力される。The output of the SSB modulator 3 and the output of the carrier wave oscillator 2 are added by the adder circuit 4, and the carrier wave is added as the output.
Get the SSB signal. The output of the adder circuit 4 is up-converted and power-amplified by the transmitter 5, and then radiated from the transmission antenna 6 at a desired frequency and power. In the receiving unit 15, the signal received by the receiving antenna 8 is down-converted and amplified by the receiver 9 and then the amplitude limiter 10 is received.
Entered in.
振幅制限器10ではフェージングにより生じた受信レベル
の変動を抑圧し一定の振幅とする。振幅制限器10の出力
は鋸歯状波発生回路11によって零点と交差する振幅制限
器出力の時間間隔に比例した鋸歯状波を発生するように
してある。この出力はバンドパスフィルタ12で不要波を
除去する。バンドパスフィルタ12の出力は包絡線検波器
13により検波され復調信号出力端子14に出力される。The amplitude limiter 10 suppresses fluctuations in the reception level caused by fading to make the amplitude constant. The output of the amplitude limiter 10 is generated by the sawtooth wave generation circuit 11 so as to generate a sawtooth wave proportional to the time interval of the output of the amplitude limiter intersecting the zero point. The bandpass filter 12 removes unnecessary waves from this output. The output of the bandpass filter 12 is an envelope detector.
The signal is detected by 13 and output to the demodulation signal output terminal 14.
本発明の方法において、帯域制限された情報信号で下側
帯域SSB変調して得られた信号に搬送波信号を付加した
信号は実数の零点を有し、零点のみを伝送することによ
り情報の伝送ができる。In the method of the present invention, the signal obtained by adding the carrier signal to the signal obtained by modulating the lower side band SSB with the band-limited information signal has a real zero, and the information can be transmitted by transmitting only the zero. it can.
従って、振幅変調成分が不要であり、フェージングによ
り生じた振幅変動は振幅制限器により一定にすることが
可能となる。なお、下側帯波SSB変調に代えて上側帯波S
SB変調を行なう場合には情報信号の帯域は１オクターブ
以内としなければならない。（特願昭59−259354号参
照） 次に本発明の原理を数式により説明する。ここでは、簡
単にするため情報信号ｍ（ｔ）は角周波数ωｍのトーン
信号とする。このとき、送信信号Ｓ（ｔ）は Ｓ（ｔ）＝C cosω ct＋a cos（ωｃ−ωｍ）ｔ ＝Ａ（ｔ）cos｛ωct−φ（ｔ）｝ ……（１） ただし、Ｃ＞A,ωｃ》ωｍで与えられる。Therefore, the amplitude modulation component is unnecessary, and the amplitude variation caused by fading can be made constant by the amplitude limiter. In addition, instead of the lower sideband SSB modulation, the upper sideband S
When performing SB modulation, the bandwidth of the information signal must be within one octave. (See Japanese Patent Application No. 59-259354) Next, the principle of the present invention will be described using mathematical expressions. Here, for simplicity, the information signal m (t) is a tone signal having an angular frequency ωm. At this time, the transmission signal S (t) is S (t) = C cos ω ct + a cos (ω c −ω m) t = A (t) cos {ω ct −φ (t)} (1) where C> A, ωc >> ωm.
但し、Ｃおよびωｃは付加した搬送波信号のレベルおよ
び角周波数である。またａは下側帯波SSB信号のレベル
である。However, C and ωc are the level and angular frequency of the added carrier signal. Further, a is the level of the lower sideband SSB signal.
さらに、式（１）のＡおよびφ（ｔ）はＳ（ｔ）の振幅
および位相であり、各々 で表わされる。Further, A and φ (t) in equation (1) are the amplitude and phase of S (t), respectively. It is represented by.
Ｓ（ｔ）が振幅制限器を通過したとき、その出力信号ｅ
（ｔ）は ｅ（ｔ）＝sgn〔cos（ωct−φ（ｔ））〕 ……（３） となる。When S (t) passes through the amplitude limiter, its output signal e
(T) becomes e (t) = sgn [cos (ωct−φ (t))] (3).
ｅ（ｔ）の零点の間隔から失われた振幅項を再生する。
すなわち、零点の周期Ｔ（ｔ）を求めると となる、式（４）の（ ）内が復元された振幅項とな
る。この項を抽出するための鋸歯状波発生回路を用い
る。Recover the missing amplitude terms from the zero spacing of e (t).
That is, when the cycle T (t) of the zero point is calculated, The expression (4) in () is the restored amplitude term. A sawtooth wave generation circuit for extracting this term is used.
鋸歯状波には高調波成分を多く含むためωｃの成分のみ
を抽出するためおよび式（４）の係数fmを等化するため
のバンドパスフィルタを用いる。Since the sawtooth wave contains many harmonic components, a bandpass filter is used to extract only the component of ωc and to equalize the coefficient fm of the equation (4).
この結果、振幅情報が復元された信号S0（ｔ）は となる。As a result, the signal S 0 (t) whose amplitude information is restored is Becomes
S0（ｔ）を包絡線検波することにより、検波出力Ｖ
（ｔ）として を得る。式（６）の第１項は直流分、第２項は復調信号
を表わす。従ってＶ（ｔ）の直流分を除くことにより復
調信号を得ることができる。By performing envelope detection on S 0 (t), the detection output V
As (t) To get The first term of the equation (6) represents the direct current component, and the second term represents the demodulated signal. Therefore, a demodulated signal can be obtained by removing the DC component of V (t).
以上説明したように、本発明のSSB通信方式によれば、
移動伝搬路等で受ける振幅歪を除去するために、受信部
に振幅制限器が挿入できるので陸上移動通信のように送
受信間の信号伝搬環境が大きく変動する条件下でも、良
好な復調信号が得られる利点がある。As described above, according to the SSB communication method of the present invention,
An amplitude limiter can be inserted in the receiving section to remove the amplitude distortion received in the mobile propagation path, etc., so that a good demodulated signal can be obtained even under conditions where the signal propagation environment between the transmitter and the receiver fluctuates greatly like land mobile communication. There is an advantage.
さらに、乗積検波を行なう場合と比較して搬送波再生回
路が不要となり受信機構成を簡潔なものと成し得るとい
う利点がある。Further, there is an advantage that the carrier wave regenerating circuit is not required and the receiver structure can be simplified as compared with the case of performing the product detection.
第１図は、本発明の一実施令の送受信部を示すブロック
図である。 １……変調信号入力端子、２……搬送波発振器、３……
SSB変調器、４……加算回路、５……送信機、６……送
信アンテナ、７……送信部、８……受信アンテナ、９…
…受信機、10……振幅制限器、10……鋸歯状波発生回
路、12……バンドパスフィルタ、13……包絡線検波器、
14……復調信号出力端子、15……受信部FIG. 1 is a block diagram showing a transmitting / receiving unit according to an embodiment of the present invention. 1 ... Modulation signal input terminal, 2 ... Carrier oscillator, 3 ...
SSB modulator, 4 ... addition circuit, 5 ... transmitter, 6 ... transmission antenna, 7 ... transmission unit, 8 ... reception antenna, 9 ...
… Receiver, 10 …… Amplitude limiter, 10 …… Sawtooth wave generation circuit, 12 …… Bandpass filter, 13 …… Envelope detector,
14 …… Demodulation signal output terminal, 15 …… Receiver
Claims (1)
されたSSB信号に搬送波信号を付加した信号を送出し
て、受信側では該信号を受信後振幅制限してから、その
振幅制限を行なった信号出力の零点の時間間隔に比例す
る振幅を有する信号を発生させ、該信号に含まれる不要
波をフィルタで除去した後、包絡線検波することにより
復調信号を得ることを特徴とするSSB通信方式。1. A transmission side transmits a signal obtained by adding a carrier signal to an SSB signal modulated by a modulation input signal, and the reception side limits the amplitude of the received signal and then limits the amplitude. SSB communication characterized in that a demodulated signal is obtained by generating a signal having an amplitude proportional to the time interval of the zero point of the signal output, removing unnecessary waves included in the signal with a filter, and then performing envelope detection. method.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10943885A JPH0754916B2 (en) | 1985-05-23 | 1985-05-23 | SSB communication method |
| DE8585308784T DE3585502D1 (en) | 1984-12-10 | 1985-12-03 | SINGLE-SIDED TAPE TRANSFER SYSTEM. |
| EP85308784A EP0184923B1 (en) | 1984-12-10 | 1985-12-03 | Single-sideband communication system |
| US06/806,991 US4803739A (en) | 1984-12-10 | 1985-12-09 | SSB communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10943885A JPH0754916B2 (en) | 1985-05-23 | 1985-05-23 | SSB communication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61269430A JPS61269430A (en) | 1986-11-28 |
| JPH0754916B2 true JPH0754916B2 (en) | 1995-06-07 |
Family
ID=14510242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10943885A Expired - Fee Related JPH0754916B2 (en) | 1984-12-10 | 1985-05-23 | SSB communication method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0754916B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0667755B2 (en) * | 1988-06-21 | 1994-08-31 | 本田技研工業株式会社 | Small water vehicle |
-
1985
- 1985-05-23 JP JP10943885A patent/JPH0754916B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61269430A (en) | 1986-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |