JPH03230637A - Privacy communication system and transmitter-receiver - Google Patents
Privacy communication system and transmitter-receiverInfo
- Publication number
- JPH03230637A JPH03230637A JP2026694A JP2669490A JPH03230637A JP H03230637 A JPH03230637 A JP H03230637A JP 2026694 A JP2026694 A JP 2026694A JP 2669490 A JP2669490 A JP 2669490A JP H03230637 A JPH03230637 A JP H03230637A
- Authority
- JP
- Japan
- Prior art keywords
- modulation
- narrowband
- information
- spread spectrum
- encryption key
- 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.)
- Granted
Links
- 238000004891 communication Methods 0.000 title claims abstract description 12
- 238000001228 spectrum Methods 0.000 claims abstract description 45
- 230000015572 biosynthetic process Effects 0.000 claims abstract 2
- 238000003786 synthesis reaction Methods 0.000 claims abstract 2
- 230000002194 synthesizing effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はスペクトラム拡散変調を使用した秘匿通信方式
および送受信機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a secure communication system and a transmitter/receiver using spread spectrum modulation.
〔従来の技術〕
従来、スペクトラム拡散変調を用いた秘匿通信技術とし
ては、通信情報をそのまま拡散符号によってスペクトラ
ム拡散を行って伝送したり、あるいは、通信情報を所定
の暗号キーで暗号化した後、暗号化された通信情報およ
び暗号化キー全てに対して拡散符号でスペクトラム拡散
を行って伝送している。[Prior Art] Conventionally, as a secret communication technology using spread spectrum modulation, communication information is transmitted as it is by spreading spectrum using a spreading code, or communication information is encrypted with a predetermined encryption key and then transmitted. All encrypted communication information and encryption keys are transmitted after being spread spectrum using a spreading code.
上述した従来の秘匿通信技術では、伝送する情報全てに
対して拡散符号でスペクトラム拡散を行っているが、拡
散符号が解読されて情報が傍受されるのを回避するため
に処理利得を大きくするため、所要周波数帯域幅が拡大
して周波数の有効活用ができないという欠点がある。In the conventional secret communication technology mentioned above, all information to be transmitted is subjected to spectrum spreading using a spreading code, but in order to increase the processing gain to avoid the spreading code being decoded and the information being intercepted However, the disadvantage is that the required frequency bandwidth is expanded and the frequency cannot be used effectively.
本発明の目的は、伝送する情報の一部に対してのみスペ
クトラム拡散を用いることによって、所要周波数帯域幅
を拡大することなく秘匿通信を行うことができ、周波数
の有効活用ができる秘匿通信方式および送受信機を提供
することにある。An object of the present invention is to provide a secret communication method that uses spread spectrum only for a part of the information to be transmitted, thereby making it possible to perform secret communication without expanding the required frequency bandwidth, and making effective use of frequencies. The purpose is to provide transmitters and receivers.
本発明の秘匿通信方式は、暗号化するための暗号キーを
生成する暗号キー生成手段と、前記暗号キーに基づいて
情報を暗号化する暗号化手段と、拡散符号を用いて搬送
波をスペクトラム拡散変調して変調搬送波を出力する拡
散変調手段と、前記スペクトラム拡散変調による所要帯
域幅よりは狭帯域の変調を行って変調搬送波を出力する
第１および第２の狭帯域変調手段と、２つの変調搬送波
を合成する合成手段とを備え、情報を前記暗号化手段に
よって暗号化したのち前記第１の狭帯域変調手段を介し
て前記合成手段へ送出すると共に、前記暗号キーを前記
第２の狭帯域変調手段および前記拡散変調手段を介して
前記合成手段へ送出する送信機と：前記第１および第２
の狭帯域変調手段によって変調された変調搬送波をそれ
ぞれ復調する第１および第２の狭帯域復調手段と、前記
拡散変調手段によってスペクトラム拡散変調された変調
搬送波を復調する拡散復調手段と、暗号キーに基づいて
情報を解読する暗号解読手段とを備え、前記第１の狭帯
域復調手段によって暗号化された情報を再生し、また、
前記スペクトラム拡散復調手段および前記第２の狭帯域
復調手段によって前記暗号キーを再生し前記暗号解読手
段によって前記暗号化された情報を解読する受信機とか
ら構成される。The secure communication method of the present invention includes a cryptographic key generating means for generating a cryptographic key for encryption, an encrypting means for encrypting information based on the cryptographic key, and a spread spectrum modulation of a carrier wave using a spreading code. spread modulation means for outputting a modulated carrier wave, first and second narrowband modulation means for performing modulation in a narrower band than the required bandwidth by the spread spectrum modulation and outputting a modulated carrier wave; and two modulated carrier waves. and a synthesizing means for synthesizing the information, the information is encrypted by the encrypting means and then sent to the synthesizing means via the first narrowband modulating means, and the encryption key is sent to the synthesizing means via the first narrowband modulating means. and a transmitter for sending the signal to the combining means via the spreading modulation means: the first and second
first and second narrowband demodulation means for demodulating the modulated carrier wave modulated by the narrowband modulation means of the above-mentioned narrowband modulation means; spread demodulation means for demodulating the modulated carrier wave spread spectrum modulated by the spread modulation means; a decryption means for decoding information based on the first narrowband demodulation means, and reproducing the information encrypted by the first narrowband demodulation means;
and a receiver that regenerates the encryption key using the spread spectrum demodulation means and the second narrowband demodulation means, and decrypts the encrypted information using the decryption means.
本発明の送信機は、暗号化するための暗号キーを生成す
る暗号キー生成手段と、前記暗号キーに基づいて情報を
暗号化する暗号化手段と、拡散符号を用いて搬送波をス
ペクトラム拡散変調して変調搬送波を出力する拡散変調
手段と、前記スペクトラム拡散変調による所要帯域幅よ
りは狭帯域の変調を行って変調搬送波を出力する第１お
よび第２の狭帯域変調手段と、２つの変調搬送波を合成
する合成手段とを備え、情報を前記暗号化手段によって
暗号化したのち前記第１の狭帯域変調手段を介して前記
合成手段へ送出すると共に、前記暗号キーを前記第２の
狭帯域変調手段および前記拡散変調手段を介して前記合
成手段へ送出する構成である。The transmitter of the present invention includes an encryption key generation means for generating an encryption key for encryption, an encryption means for encrypting information based on the encryption key, and a spread spectrum modulation of a carrier wave using a spreading code. a spread modulation means for outputting a modulated carrier wave using the spread spectrum modulation; first and second narrowband modulation means for performing modulation in a narrower band than the required bandwidth by the spread spectrum modulation and outputting a modulated carrier wave; a synthesizing means for synthesizing the information, and after encrypting the information by the encrypting means, transmitting the information to the synthesizing means via the first narrowband modulating means, and transmitting the encryption key to the second narrowband modulating means. and the configuration is such that the signal is sent to the combining means via the spreading modulation means.
本発明の受信機は、前記第１および第２の狭帯域変調手
段によって変調された変調搬送波をそれぞれ復調する第
１および第２の狭帯域復調手段と、前記拡散変調手段に
よってスペクトラム拡散変調された変調搬送波を復調す
る拡散復調手段と、暗号キーに基づいて情報を解読する
暗号解読手段とを備え、前記第１の狭帯域復調手段によ
って暗号化された情報を再生し、また、前記スペクトラ
ム拡散復調手段および前記第２の狭帯域復調手段によっ
て前記暗号キーを再生し前記暗号解読手段によって前記
暗号化された情報を解読する構成である。The receiver of the present invention includes first and second narrowband demodulation means for respectively demodulating the modulated carrier waves modulated by the first and second narrowband modulation means, and spread spectrum modulation by the spread modulation means. comprising a spread demodulation means for demodulating a modulated carrier wave and a decryption means for decoding information based on a cryptographic key, reproducing the information encrypted by the first narrowband demodulation means; and the second narrowband demodulating means regenerate the encryption key, and the decryption means decrypts the encrypted information.
次に図面を参照して本発明を説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示すブロック図である。送
信機１０は、暗号キー生成部１１、暗号化部１２、狭帯
域変調部１３．１４、スペクトラム拡散変調部１５、合
成部１６、送信部１７を備えている。また、受信機２０
は、受信部２１、スペクトラム拡散復調部２２、狭帯域
復調部２３゜２４、暗号解読部２５を備えている。FIG. 1 is a block diagram showing one embodiment of the present invention. The transmitter 10 includes an encryption key generation section 11, an encryption section 12, narrowband modulation sections 13 and 14, a spread spectrum modulation section 15, a combination section 16, and a transmission section 17. In addition, the receiver 20
includes a receiving section 21, a spread spectrum demodulating section 22, a narrowband demodulating section 23, 24, and a decoding section 25.
送信機１０の暗号キー生成部１１は、情報信号Ｃ０を暗
号化するための暗号キー信号に、を生成し出力する。暗
号化部１２は、暗号キー生成部１１から暗号キー信号Ｋ
。を受けて情報信号Ｃ８を暗号化して暗号化情報信号Ｃ
１を出力する。狭帯域変調部１３は、暗号化情報信号Ｃ
１により搬送波に対し狭帯域な変調を行って情報変調搬
送信号Ｃ２として出力する。なお、ここでいう狭帯域変
調とは、スペクトラム拡散変調の所要帯域幅よりは狭帯
域の所要帯域幅となる変調という意味である。同様に、
狭帯域変調部１４は、暗号キー信号Ｋ。により搬送波に
対し狭帯域な変調を行って変調搬送信号に１として出力
する。スペクトラム拡散変調部１５は、変調搬送信号に
１に対し拡散符号を用いてスペクトラム拡散変調を行い
暗号キー変調搬送信号に２として出力する。合成部１６
は、情報変調搬送信号Ｃ２および暗号キー変調搬送信号
に２を合成して合成信号Ｃ２十に２を送信部１７へ送出
する。送信部１７は、合成信号Ｃ２＋に２を所定の送信
周波数に周波数変換および電力増幅を行って送信する。The encryption key generation unit 11 of the transmitter 10 generates and outputs an encryption key signal for encrypting the information signal C0. The encryption unit 12 receives the encryption key signal K from the encryption key generation unit 11.
. and encrypts the information signal C8 to generate an encrypted information signal C.
Outputs 1. The narrowband modulation section 13 receives the encrypted information signal C.
1 performs narrowband modulation on the carrier wave and outputs it as an information modulated carrier signal C2. Note that narrowband modulation here means modulation that has a required bandwidth narrower than that required for spread spectrum modulation. Similarly,
The narrowband modulator 14 receives the cryptographic key signal K. performs narrowband modulation on the carrier wave and outputs it as a 1 as a modulated carrier signal. The spread spectrum modulation unit 15 performs spread spectrum modulation on the modulated carrier signal 1 using a spreading code, and outputs the modulated carrier signal as 2. Synthesizer 16
combines the information modulated carrier signal C2 and the cryptographic key modulated carrier signal and sends the combined signal C2 plus 2 to the transmitter 17. The transmitter 17 performs frequency conversion and power amplification on the composite signal C2+ to a predetermined transmission frequency, and transmits the resultant signal.
第２図は情報変調搬送信号Ｃ２および暗号キー変調搬送
信号に２の周波数スペクトラムの一例を示す図であり、
情報変調搬送信号Ｃ２の周波数帯域幅Ｂｃは、スペクト
ラム拡散変調された暗号キー変調搬送信号に２の周波数
帯域幅Ｂｋよりも狭帯域となっている。いま、情報信号
ｃｏの周期Ｔ当りの情報シンボル数をＤｃとし、狭帯域
変調による係数をＡｃ１とすれば、情報変調搬送信号Ｃ
２の周波数帯域幅Ｂ ｃ ＝ Ａ ｃ Ｉ Ｘ Ｄ ｃ
／ Ｔとなる。FIG. 2 is a diagram showing an example of the frequency spectrum of the information modulated carrier signal C2 and the encryption key modulated carrier signal,
The frequency bandwidth Bc of the information modulated carrier signal C2 is narrower than the frequency bandwidth Bk of the spread spectrum modulated encryption key modulated carrier signal 2. Now, if the number of information symbols per period T of the information signal co is Dc, and the coefficient due to narrowband modulation is Ac1, then the information modulated carrier signal C
2 frequency bandwidth B c = A c I X D c
/ becomes T.
また、暗号キー信号に、の周期Ｔ当りの情報シンボル数
をＤｋとし、狭帯域変調による係数をＡｋ２、スペクト
ラム拡散変調による拡散係数をＡｋ、とすれば、暗号キ
ー変調搬送信号に２の周波数帯域幅Ｂｋ ＝Ａｋ２ＸＡ
ｋ、ＸＤｋ／Ｔとなる。情報信号Ｃ８の周期Ｔ当りの情
報シンボル数Ｄｃと暗号キー信号に、の周期Ｔ当りの情
報シンボル数Ｄｋを比較すれば、一般にＤｋ ＜Ｄｃで
あるから、Ｄｃ ＋Ｄｋの情報全てに対してスペクトラ
ム拡散変調を行った場合よりもはるかに狭い周波数帯域
幅とすることができる。Furthermore, if the number of information symbols per cycle T of the encryption key signal is Dk, the coefficient by narrowband modulation is Ak2, and the spreading coefficient by spread spectrum modulation is Ak, then the encryption key modulated carrier signal has a frequency band of 2. Width Bk =Ak2XA
k, XDk/T. If we compare the number of information symbols Dc per period T of the information signal C8 and the number Dk of information symbols per period T of the encryption key signal, generally Dk < Dc, so all information of Dc + Dk is spread spectrum. A much narrower frequency bandwidth can be achieved than with modulation.
受信機２０の受信部２１は、送信機１０から送信された
電波を受信して合成信号Ｃ２＋に２をスペクトラム拡散
復調部２２および狭帯域復調部２３へ出力する。スペク
トラム拡散復調部２２は、入力する合成信号Ｃｚ ＋
Ｋ ２に対して送信側拡散符号系列に等しいパターンの
拡散符号系列との相関を求めることにより復調する。こ
の場合、合成信号Ｃ２＋に２の内、スペクトラム拡散変
調された暗号キー変調搬送信号に２成分のみが復調され
て変調搬送信号に□が再生され、狭帯域変調された情報
変調搬送信号Ｃ２成分は消滅する。また、変調搬送信号
に１は狭帯域復調部２４で更に復調されて暗号キー信号
Ｋ。が再生される。The receiving section 21 of the receiver 20 receives the radio waves transmitted from the transmitter 10 and outputs a composite signal C2+ of 2 to the spread spectrum demodulating section 22 and the narrowband demodulating section 23. The spread spectrum demodulator 22 receives the input composite signal Cz +
Demodulation is performed by determining the correlation between K 2 and a spreading code sequence with a pattern equal to the transmitting side spreading code sequence. In this case, only two of the two components of the composite signal C2+ are demodulated into the cryptographic key modulated carrier signal subjected to spread spectrum modulation, and □ is regenerated into the modulated carrier signal, and the narrowband modulated information modulated carrier signal C2 component is Disappear. Furthermore, the 1 in the modulated carrier signal is further demodulated by the narrowband demodulator 24 to generate the encryption key signal K. is played.
一方、狭帯域復調部２３は、入力する合成信号Ｃ２＋に
２に対して狭帯域復調を行う。この場合、合成信号Ｃ２
モに２の内、狭帯域変調された電力密度の高い情報変調
搬送信号Ｃ２成分のみが復調されて暗号化された情報信
号ＣＩが再生され、スペクトラム拡散変調された電力密
度の低い暗号キー変調搬送信号に２成分は消滅する。暗
号解読部２５は、狭帯域復調部２４で再生された暗号キ
ー信号Ｋｏおよび狭帯域復調部２３で再生された暗号化
された情報信号Ｃ１を受け、暗号キー信号Ｋｏを基にこ
れを解読して情報信号Ｃ８を出力する。On the other hand, the narrowband demodulation section 23 performs narrowband demodulation on the input composite signal C2+. In this case, the composite signal C2
Among the two components, only the narrowband modulated high power density information modulated carrier signal C2 component is demodulated and the encrypted information signal CI is regenerated, and the spread spectrum modulated low power density cryptographic key modulated carrier signal CI is demodulated. The two components in the signal disappear. The decryption unit 25 receives the encryption key signal Ko reproduced by the narrowband demodulation unit 24 and the encrypted information signal C1 reproduced by the narrowband demodulation unit 23, and decrypts it based on the encryption key signal Ko. and outputs an information signal C8.
以上説明したように本発明によれば、情報を暗号キーに
基づいて暗号化し、暗号キーに対してのみスペクトラム
拡散変調を行うので、所要周波数帯域幅を充分に狭くす
ることができて周波数の有効活用を図ることができ、ま
た、暗号化された全ての情報に対してスペクトラム拡散
変調を行ったのと同程度の秘匿性、すなわち耐傍受性を
持たせることができる。As explained above, according to the present invention, information is encrypted based on a cryptographic key and spread spectrum modulation is performed only on the cryptographic key, so the required frequency bandwidth can be sufficiently narrowed and the frequency can be effectively used. In addition, all encrypted information can be provided with the same degree of confidentiality, ie, interception resistance, as when spread spectrum modulation is applied to all encrypted information.
第１図は本発明の一実施例を示すブロック図、第２図は
情報変調搬送信号Ｃ２および暗号キー変調搬送信号に２
の周波数スペクトラムの一例を示す図である。
１０・−・送信機、１１・・−暗号キー生成部、１２・
・・暗号化部、１３．１４・・・狭帯域変調部、１５・
−・スペクトラム拡散変調部、１６・・・合成部、１７
−・送信部、２０・・・受信機、２１・・・受信部、２
２・・−スペクトラム拡散復調部、２３．２４・・−狭
帯域復調部、２５・・・暗号解読部、ｃｏ・・・情報信
号、Ｋｏ・・・暗号キー信号、Ｃ２・・・情報変調搬送
信号、Ｋ２・・・暗号キー変調搬送信号。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 shows an information modulated carrier signal C2 and an encryption key modulated carrier signal C2.
FIG. 2 is a diagram showing an example of a frequency spectrum of FIG. 10...-Transmitter, 11...-Encryption key generation unit, 12...
... Encryption section, 13.14... Narrowband modulation section, 15.
- Spread spectrum modulation section, 16... Combination section, 17
-・Transmitter, 20...Receiver, 21...Receiver, 2
2...-spread spectrum demodulation unit, 23.24...-narrowband demodulation unit, 25... decryption unit, co...information signal, Ko...encryption key signal, C2...information modulation transport Signal, K2... Encryption key modulation carrier signal.
Claims (1)
手段と、前記暗号キーに基づいて情報を暗号化する暗号
化手段と、拡散符号を用いて搬送波をスペクトラム拡散
変調して変調搬送波を出力する拡散変調手段と、前記ス
ペクトラム拡散変調による所要帯域幅よりは狭帯域の変
調を行って変調搬送波を出力する第１および第２の狭帯
域変調手段と、２つの変調搬送波を合成する合成手段と
を備え、情報を前記暗号化手段によって暗号化したのち
前記第１の狭帯域変調手段を介して前記合成手段へ送出
すると共に、前記暗号キーを前記第２の狭帯域変調手段
および前記拡散変調手段を介して前記合成手段へ送出す
る送信機と；前記第１および第２の狭帯域変調手段によ
って変調された変調搬送波をそれぞれ復調する第１およ
び第２の狭帯域復調手段と、前記拡散変調手段によって
スペクトラム拡散変調された変調搬送波を復調する拡散
復調手段と、暗号キーに基づいて情報を解読する暗号解
読手段とを備え、前記第１の狭帯域復調手段によって暗
号化された情報を再生し、また、前記スペクトラム拡散
復調手段および前記第２の狭帯域復調手段によって前記
暗号キーを再生し前記暗号解読手段によって前記暗号化
された情報を解読する受信機とから構成されることを特
徴とする秘匿通信方式。 ２、暗号化するための暗号キーを生成する暗号キー生成
手段と、前記暗号キーに基づいて情報を暗号化する暗号
化手段と、拡散符号を用いて搬送波をスペクトラム拡散
変調して変調搬送波を出力する拡散変調手段と、前記ス
ペクトラム拡散変調による所要帯域幅よりは狭帯域の変
調を行って変調搬送波を出力する第１および第２の狭帯
域変調手段と、２つの変調搬送波を合成する合成手段と
を備え、情報を前記暗号化手段によって暗号化したのち
前記第１の狭帯域変調手段を介して前記合成手段へ送出
すると共に、前記暗号キーを前記第２の狭帯域変調手段
および前記拡散変調手段を介して前記合成手段へ送出す
ることを特徴とする送信機。 ３、前記第１および第２の狭帯域変調手段によって変調
された変調搬送波をそれぞれ復調する第１および第２の
狭帯域復調手段と、前記拡散変調手段によってスペクト
ラム拡散変調された変調搬送波を復調する拡散復調手段
と、暗号キーに基づいて情報を解読する暗号解読手段と
を備え、前記第１の狭帯域復調手段によって暗号化され
た情報を再生し、また、前記スペクトラム拡散復調手段
および前記第２の狭帯域復調手段によって前記暗号キー
を再生し前記暗号解読手段によって前記暗号化された情
報を解読することを特徴とする受信機。[Claims] 1. Encryption key generation means for generating an encryption key for encryption, encryption means for encrypting information based on the encryption key, and spread spectrum modulation of a carrier wave using a spreading code. spread modulation means for outputting a modulated carrier wave, first and second narrowband modulation means for performing modulation in a narrower band than the required bandwidth by the spread spectrum modulation and outputting a modulated carrier wave; and two modulated carrier waves. and a synthesizing means for synthesizing the information, the information is encrypted by the encrypting means and then sent to the synthesizing means via the first narrowband modulating means, and the encryption key is sent to the synthesizing means via the first narrowband modulating means. and a transmitter for transmitting data to the combining means via the spreading modulation means; first and second narrowband demodulation means for demodulating the modulated carrier waves modulated by the first and second narrowband modulation means, respectively; and spread demodulation means for demodulating the modulated carrier wave that has been spread spectrum modulated by the spread modulation means, and decryption means for decoding information based on an encryption key, the information being encrypted by the first narrowband demodulation means. a receiver for reproducing the encrypted information by the spread spectrum demodulation means and the second narrowband demodulation means, and for decoding the encrypted information by the decryption means. A secret communication method characterized by: 2. An encryption key generation means for generating an encryption key for encryption, an encryption means for encrypting information based on the encryption key, and spread spectrum modulation of a carrier wave using a spreading code to output a modulated carrier wave. first and second narrowband modulation means for performing modulation in a narrower band than the required bandwidth by the spread spectrum modulation and outputting a modulated carrier wave; and combining means for combining two modulated carrier waves. , the information is encrypted by the encryption means and then sent to the synthesis means via the first narrowband modulation means, and the encryption key is transmitted to the second narrowband modulation means and the spread modulation means. A transmitter characterized in that the transmitter transmits data to the combining means via the composing means. 3. First and second narrowband demodulation means that demodulate the modulated carrier waves modulated by the first and second narrowband modulation means, respectively, and demodulate the modulated carrier wave that has been spread spectrum modulated by the spread modulation means. comprising a spread spectrum demodulation means and a decryption means for decoding information based on an encryption key, and reproducing the information encrypted by the first narrowband demodulation means; A receiver characterized in that said encryption key is regenerated by said narrowband demodulation means and said encrypted information is decrypted by said decryption means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2669490A JP3067144B2 (en) | 1990-02-05 | 1990-02-05 | Secure communication system and transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2669490A JP3067144B2 (en) | 1990-02-05 | 1990-02-05 | Secure communication system and transceiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03230637A true JPH03230637A (en) | 1991-10-14 |
| JP3067144B2 JP3067144B2 (en) | 2000-07-17 |
Family
ID=12200498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2669490A Expired - Lifetime JP3067144B2 (en) | 1990-02-05 | 1990-02-05 | Secure communication system and transceiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3067144B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721734A (en) * | 1995-04-28 | 1998-02-24 | Nec Corporation | Code division multiple access unit and code division multiple access method |
| WO2009104234A1 (en) * | 2008-02-18 | 2009-08-27 | 学校法人同志社 | Wireless device, wireless system, and method for confidential communication |
| KR20190125198A (en) * | 2018-04-27 | 2019-11-06 | 인피니온 테크놀로지스 아게 | Transceiver, system with transceiver, and signal |
-
1990
- 1990-02-05 JP JP2669490A patent/JP3067144B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721734A (en) * | 1995-04-28 | 1998-02-24 | Nec Corporation | Code division multiple access unit and code division multiple access method |
| WO2009104234A1 (en) * | 2008-02-18 | 2009-08-27 | 学校法人同志社 | Wireless device, wireless system, and method for confidential communication |
| JP5327974B2 (en) * | 2008-02-18 | 2013-10-30 | 学校法人同志社 | Wireless device, wireless system, and secret communication method |
| KR20190125198A (en) * | 2018-04-27 | 2019-11-06 | 인피니온 테크놀로지스 아게 | Transceiver, system with transceiver, and signal |
| US11374758B2 (en) | 2018-04-27 | 2022-06-28 | Infineon Technologies Ag | Transceiver and transceiver systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3067144B2 (en) | 2000-07-17 |
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