JP2714226B2 - Spread spectrum communication system - Google Patents
Spread spectrum communication systemInfo
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- JP2714226B2 JP2714226B2 JP13875990A JP13875990A JP2714226B2 JP 2714226 B2 JP2714226 B2 JP 2714226B2 JP 13875990 A JP13875990 A JP 13875990A JP 13875990 A JP13875990 A JP 13875990A JP 2714226 B2 JP2714226 B2 JP 2714226B2
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- 238000001228 spectrum Methods 0.000 title claims description 35
- 238000004891 communication Methods 0.000 title claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Description
【発明の詳細な説明】 （イ） 産業上の利用分野 本発明はスペクトラム拡散通信システムに関する。The present invention relates to a spread spectrum communication system.
（ロ） 従来の技術 従来、情報信号よりも充分広いスペクトラム幅を有す
る、例えば２進の疑似雑音符号（Pseudo Noise Code）
（以下、PN符号と称す）でスペクトラムが拡散された搬
送波信号を送信し、受信側では送信側で用いたのと同一
のPN符号で受信信号を乗算することにより元の情報を復
調する、所謂スペクトラム拡散通信が知られている（例
えば、電子科学1978年11月号参照）。(B) Conventional technology Conventionally, for example, a binary pseudo noise code (Pseudo Noise Code) having a spectrum width sufficiently wider than an information signal.
(Hereinafter, referred to as a PN code), a carrier signal having a spread spectrum is transmitted, and the receiving side demodulates the original information by multiplying the received signal by the same PN code used on the transmitting side. Spread spectrum communication is known (see, for example, Electronics Science, November 1978).
また、近年では周波数利用効率の優れたものとして、
Ｍ−ary方式によるスペクトル拡散通信方式が提案され
ている（例えば、電子情報通信学会SSTA89−37;1989年1
1月８、９日参照）。In recent years, as one with excellent frequency use efficiency,
A spread spectrum communication method based on the M-ary method has been proposed (for example, IEICE SSTA89-37; January 1989).
(See January 8 and 9).
此種Ｍ−ary方式について簡単に説明すると、送信側
に各々符号長及び発生速度が同一で且つ符号間で同期が
とれている、異なるＭ個の拡散符号を発生する拡散符号
発生器を設け、この拡散符号発生器からの拡散符号を情
報信号に応じて選択し、この選択された拡散符号にて搬
送波信号のスペクトラムを拡散して送信する。Briefly describing this type of M-ary method, a transmitting side is provided with a spreading code generator that generates different M spreading codes, each having the same code length and generation rate and being synchronized between codes, The spread code from the spread code generator is selected according to the information signal, and the spectrum of the carrier signal is spread by the selected spread code and transmitted.
一方、受信側では、前記拡散符号発生器からの各拡散
符号と同じく若しくは相関の大きい、Ｍ個の符号を発生
する符号発生器とを設け、受信信号と符号発生器からの
符号とを各々乗算することにより、受信信号のスペクト
ラムを逆拡散する。On the other hand, on the receiving side, a code generator for generating M codes having the same or a large correlation with each spreading code from the spreading code generator is provided, and the received signal is multiplied by the code from the code generator. By doing so, the spectrum of the received signal is despread.
このとき、受信信号に含まれる拡散符号と同一若しく
は相関の大きい符号が供給される乗算器の出力にのみ搬
送波信号が再生されるので、この搬送波信号を検出する
ことにより情報信号を復元することができる。At this time, since the carrier signal is reproduced only at the output of the multiplier to which a code having the same or a large correlation as the spread code included in the received signal is supplied, the information signal can be restored by detecting the carrier signal. it can.
（ハ） 発明が解決しようとする課題 ところで、スペクトラム拡散通信では、受信側で情報
信号を正確に再生するためには、受信側で発生する符号
を送信側の符号と同期させることが不可欠である。(C) Problems to be Solved by the Invention By the way, in spread spectrum communication, in order to accurately reproduce an information signal on the receiving side, it is essential to synchronize a code generated on the receiving side with a code on the transmitting side. .
上述したＭ−ary方式では、情報によって送信される
符号系列が異なり、これを用いて同期確立を行なうこと
は難しいため、別途同期用の符号系列を同一帯域で同時
に送るようにしている。In the above-described M-ary system, a code sequence to be transmitted differs depending on information, and it is difficult to establish synchronization using the information. Therefore, a separate code sequence for synchronization is simultaneously transmitted in the same band.
然し乍ら、この場合送信電力の一部を同期系列に割り
与えるので、情報信号の拡散用系列のS/Nが少し下が
り、復調時のデータ誤り率の増加を招いたり、同期用系
列の電力が小さいと、同期捕捉に時間がかかるという問
題を有していた。However, in this case, since a part of the transmission power is allocated to the synchronization sequence, the S / N of the information signal spreading sequence is slightly lowered, which causes an increase in the data error rate at the time of demodulation and the power of the synchronization sequence is small. In this case, it takes a long time to acquire the synchronization.
（ニ） 課題を解決するための手段 上記の点に鑑み、本発明は異なるＭ個の拡散符号を発
生する拡散符号発生手段、この拡散符号発生手段からの
Ｍ個の拡散符号が供給され、情報信号に応じて１つの拡
散符号を選択する選択手段、この選択手段にて選択され
た拡散符号と搬送波信号発生手段からの搬送波信号とに
基づき搬送波信号のスペクトラムを搬送するスペクトラ
ム拡散手段、このスペクトラム拡散手段からのスペクト
ラム拡散信号を送信する送信手段を有する第１の装置
と、前記送信手段からのスペクトラム拡散信号を受信す
る受信手段、前記拡散符号発生手段から出力される各拡
散符号と同一若しくは相関の大きいＭ個の符号を発生す
る符号発生手段、前記受信手段からの受信信号と前記符
号発生手段からの各拡散符号とに基づき受信信号のスペ
クトラムを逆拡散するＭ個の逆拡散手段、このＭ個の逆
拡散手段の出力を加算する加算手段、この加算手段の出
力端に接続されたフィルタ手段、このフィルタ手段の出
力に基づき前記符号発生手段から出力される拡散符号の
位相を制御する位相制御手段を有する第２の装置とより
なることを特徴とする。(D) Means for Solving the Problems In view of the above points, the present invention provides a spreading code generating means for generating M different spreading codes, and M spreading codes supplied from the spreading code generating means are used for information processing. Selecting means for selecting one spreading code according to a signal; spectrum spreading means for carrying the spectrum of a carrier signal based on the spreading code selected by the selecting means and the carrier signal from the carrier signal generating means; A first device having a transmitting means for transmitting a spread spectrum signal from the means, a receiving means for receiving a spread spectrum signal from the transmitting means, and a signal having the same or a correlation as each spread code output from the spread code generating means. Code generating means for generating M large codes; receiving code based on a received signal from the receiving means and each spread code from the code generating means; M despreading means for despreading the spectrum of the signal, adding means for adding the outputs of the M despreading means, filter means connected to the output end of the adding means, It is characterized by comprising a second device having phase control means for controlling the phase of the spread code output from the code generation means.
（ホ） 作用 本発明に依れば、拡散符号発生手段からのＭ個の拡散
符号の内、１つを情報信号に応じて選択してこの選択さ
れた拡散符号にて搬送波信号のスペクトラムを拡散して
送信し、受信側では、前記拡散符号発生手段からの拡散
符号と同一若しくは相関の大きい、Ｍ個の符号を発生さ
せ、この符号と受信信号とに基づき受信信号のスペクト
ラムを逆拡散する。次いで、この逆拡散された信号を加
算し、フィルタを通過させることにより位相制御情報を
抽出してこの位相制御情報に基づき符号発生手段から出
力される符号の位相を制御する。(E) Function According to the present invention, one of the M spreading codes from the spreading code generating means is selected in accordance with the information signal, and the spectrum of the carrier signal is spread with the selected spreading code. The receiving side generates M codes having the same or large correlation as the spreading code from the spreading code generating means, and despreads the spectrum of the received signal based on this code and the received signal. Next, the despread signal is added, and the signal is passed through a filter to extract phase control information, and the phase of the code output from the code generation means is controlled based on the phase control information.
（ヘ） 実施例 第１図は本発明システムに係る送信機の一実施例を示
す図である。第１図において、（１）は異なるＭ個（図
示の場合では、４個）の拡散符号を発生する拡散符号発
生器で、第１拡散符号（PN1）を発生する第１拡散符号
発生部（1a）と、第２拡散符号（PN2）を発生する第２
拡散符号発生部（1b）と、第３拡散符号（PN3）を発生
する第３拡散符号発生部（1c）と、第４拡散符号（PN
4）を発生する第４拡散符号発生部（1d）とより構成さ
れている。尚、各拡散符号の符号長、発生速度は全く同
じであり、また各符号間では同期が完全にとれているも
のとする。（２）は情報信号に応じて選択信号を出力す
るデコーダ、（３）は第１〜第４拡散符号発生部からの
拡散符号の内、１つの拡散符号をデコーダ（２）からの
選択信号に応じて選択する選択回路、（４）は選択回路
（３）にて選択された拡散符号と搬送波信号発生回路
（５）からの搬送波信号とに基づき搬送波信号のスペク
トラムを拡散する拡散部で、乗算器より構成されてい
る。（６）はスペクトラム拡散された信号を送信する送
信アンテナである。(F) Embodiment FIG. 1 is a diagram showing an embodiment of a transmitter according to the system of the present invention. In FIG. 1, (1) is a spread code generator for generating M different (4 in the case shown) spread codes, and a first spread code generator (PN1) for generating a first spread code (PN1). 1a) and the second generating a second spreading code (PN2)
A spreading code generator (1b), a third spreading code generator (1c) for generating a third spreading code (PN3), and a fourth spreading code (PN
4) and a fourth spreading code generator (1d) for generating 4). It is assumed that the code length and the generation speed of each spread code are exactly the same, and that the synchronization between the codes is completely established. (2) is a decoder that outputs a selection signal according to the information signal, and (3) is one of the spreading codes from the first to fourth spreading code generators, which is used as a selection signal from the decoder (2). And a selection circuit (4) for spreading the spectrum of the carrier signal based on the spreading code selected by the selection circuit (3) and the carrier signal from the carrier signal generation circuit (5). It consists of a container. (6) is a transmission antenna for transmitting the spread spectrum signal.
第２図は本発明システムに係る受信機の一実施例を示
す図である。第２図において、（７）は受信アンテナ、
（8a）は第１拡散符号発生部（1a）からの第１拡散符号
（PN1）と同一若しくは相関の大きい第１符号（PN1′）
を発生する第１符号発生部、（8b）は第２拡散符号発生
部（1b）からの第２拡散符号（PN2）と同一若しくは相
関の大きい第２符号（PN2′）を発生する第２符号発生
部、（8c）は第３拡散発生部（1c）からの第３拡散符号
発生部（PN3）と同一若しくは相関の大きい第３符号（P
N′）を発生する第３符号発生部、（8d）は第４拡散符
号発生部（1d）からの第４拡散符号（PN4）と同一若し
くは相関の大きい第４符号（PN4′）を発生する第４符
号発生部である。この第１〜第４符号発生部にて符号発
生器を構成しており、各符号は符号長、発生速度が同一
で、然も同期しているものとする。（9a）は受信信号と
第１符号（PN1′）とを乗算する第１乗算器、（9b）は
受信信号と第２符号（PN2′）とを乗算する第２乗算
器、（9c）は受信信号と第３符号（PN3′）とを乗算す
る第３乗算器、（9d）は受信信号と第４符号（PN4′）
とを乗算する第４乗算器、（10）は第１〜第４乗算器
（9a）〜（9d）の出力を加算する加算器、（11）は加算
器（10）の出力端に接続され、搬送波信号成分を通過さ
せるバンドパスフィルタ、（12）はバンドパスフィルタ
（11）を通過した信号に基づき符号発生部から出力され
る符号の位相を制御する位相制御回路で、タウ・ディザ
回路や遅延ロックループ回路である。（13）は情報信号
を復調する復調部である。FIG. 2 is a diagram showing one embodiment of a receiver according to the system of the present invention. In FIG. 2, (7) is a receiving antenna,
(8a) is a first code (PN1 ') having the same or a large correlation as the first spread code (PN1) from the first spread code generator (1a).
The first code generator (8b) generates a second code (PN2 ') having the same or large correlation as the second spread code (PN2) from the second spread code generator (1b). The generator (8c) is the third code (P) having the same or larger correlation as the third spreading code generator (PN3) from the third spreading generator (1c).
N ') is generated by a third code generator (8d) which generates a fourth code (PN4') having the same or larger correlation as the fourth spread code (PN4) from the fourth spread code generator (1d). This is the fourth code generator. The first to fourth code generators constitute a code generator, and the codes have the same code length and the same generation speed, and are synchronized. (9a) is a first multiplier for multiplying the received signal by the first code (PN1 '), (9b) is a second multiplier for multiplying the received signal by the second code (PN2'), and (9c) is A third multiplier for multiplying the received signal by the third code (PN3 '); (9d): a third multiplier for multiplying the received signal by the fourth code (PN4')
(10) is an adder for adding the outputs of the first to fourth multipliers (9a) to (9d), and (11) is connected to the output terminal of the adder (10). , A band-pass filter for passing the carrier signal component, and (12) a phase control circuit for controlling the phase of the code output from the code generator based on the signal passed through the band-pass filter (11). This is a delay lock loop circuit. (13) is a demodulation unit for demodulating an information signal.
次に、動作について説明する。 Next, the operation will be described.
今、伝達すべき情報が「00」、「01」、「10」、「1
1」の４つであったとすると、デコーダ（２）は前記情
報に応じて拡散符号を選択する選択信号を出力する。即
ち、情報「00」のとき、第１拡散符号（PN1）を選択す
る信号を、情報「01」のとき、第２拡散符号（PN2）を
選択する信号を、情報「10」のとき、第３拡散符号（PN
3）を選択する信号「11」のとき、第４拡散符号（PN4）
を選択する信号を出力する。The information to be transmitted now is “00”, “01”, “10”, “1”
If the number is "1", the decoder (2) outputs a selection signal for selecting a spreading code according to the information. That is, when the information is "00", a signal for selecting the first spreading code (PN1) is used. When the information is "01", a signal for selecting the second spreading code (PN2) is used. 3 spreading code (PN
3) When the signal to select “11” is the fourth spreading code (PN4)
And outputs a signal for selecting.
情報が上述した順番に発生すると、選択回路（３）か
ら出力される符号は、第３図に示す如く第１拡散符号
（PN1）、第２拡散符号（PN2）第３拡散符号（PN3）、
第４拡散符号（PN4）の順になる。When the information is generated in the order described above, the codes output from the selection circuit (3) are the first spreading code (PN1), the second spreading code (PN2), the third spreading code (PN3), as shown in FIG.
The order is the fourth spreading code (PN4).
斯様に選択回路（３）で選択された拡散符号は、拡散
部（４）に供給され、拡散部（４）において搬送波信号
発生回路（５）からの搬送波信号と乗算される。その結
果、搬送波信号のスペクトラムが拡散される。斯るスペ
クトラム拡散信号は、送信アンテナ（６）を介して送信
される。The spreading code thus selected by the selection circuit (3) is supplied to the spreading section (4), and is multiplied by the carrier signal from the carrier signal generation circuit (5) in the spreading section (4). As a result, the spectrum of the carrier signal is spread. Such a spread spectrum signal is transmitted via a transmitting antenna (6).
一方、受信側では、受信アンテナ（７）にて受信され
たスペクトラム拡散信号と第１〜第４符号発生部（8a）
〜（8d）からの符号とを各々乗算し、前記スペクトラム
拡散信号を逆拡散する。On the receiving side, on the other hand, the spread spectrum signal received by the receiving antenna (7) and the first to fourth code generators (8a)
And (8d) to despread the spread spectrum signal.
今、受信側符号と送信側符号とが同期し、且つスペク
トラム拡散信号に含まれる符号系列が第４図（ａ）に示
す如くなっていたとすると、このスペクトラム拡散信号
と第１符号とを乗算する第１乗算器（9a）の出力端に
は、第４図（ｃ）に示す如く、受信信号に含まれる第１
拡散符号の期間だけ搬送波信号が再生される。尚、第２
拡散符号〜第４拡散符号の期間には、各拡散符号にてス
ペクトラム拡散されている信号が第１符号（PN1′）に
て更にスペクトラムが拡散されることになり、搬送波信
号は再生されない。Now, assuming that the receiving side code and the transmitting side code are synchronized and the code sequence included in the spread spectrum signal is as shown in FIG. 4 (a), the spread spectrum signal is multiplied by the first code. As shown in FIG. 4 (c), the output terminal of the first multiplier (9a) includes the first multiplier included in the received signal.
The carrier signal is regenerated for the duration of the spreading code. The second
During the period from the spreading code to the fourth spreading code, the spectrum of the signal spread by each spreading code is further spread by the first code (PN1 '), and the carrier signal is not reproduced.
以下、同様に第２乗算器（9b）の出力端には、第２拡
散符号の期間だけ、第３乗算器（9c）の出力端には、第
３拡散符号の期間だけ、第４乗算器（9d）の出力端に
は、第４拡散符号の期間だけ搬送波信号が再生される
〔第４図（ｅ）（ｇ）（ｉ）参照〕。Hereinafter, similarly, the output terminal of the second multiplier (9b) is connected to the output terminal of the third multiplier (9c) only during the period of the third spreading code. At the output end of (9d), the carrier signal is reproduced only during the period of the fourth spreading code [see FIGS. 4 (e), (g) and (i)].
而して、加算器（10）の出力端には、搬送波信号が略
連続して出力されることになり、これをBPF（11）を通
過させることにより不要信号成分を除去した後、位相制
御回路（12）に供給することにより符号発生器から発生
される符号の位相を制御することが可能になる。Thus, the carrier signal is output almost continuously at the output end of the adder (10). After passing through the BPF (11) to remove unnecessary signal components, the phase control is performed. Supplying the signal to the circuit (12) makes it possible to control the phase of the code generated from the code generator.
即ち、BPF（11）の出力は、従来の単一符号系列にて
スペクトラム拡散した場合と同様に、送信側符号と受信
側符号との位相関係に応じてレベルが変化するため、こ
のレベル変化を利用して位相制御を達成することが出来
る。That is, the level of the output of the BPF (11) changes in accordance with the phase relationship between the transmission side code and the reception side code, as in the case of conventional spread spectrum with a single code sequence. It can be used to achieve phase control.
尚、受信側符号と送信側符号との同期点の検出は、従
来と同様に受信側符号の位相を順次変化させることによ
り達成されるものとする。Note that the detection of the synchronization point between the receiving side code and the transmitting side code is achieved by sequentially changing the phase of the receiving side code as in the related art.
上述の如く本発明の動作は達成されるが、本発明は上
記実施例に限定されるものではなく、変調された、搬送
波信号をスペクトラム拡散する等種々変更が可能であ
り、また使用される符号系列も４つに限定されるもので
はない。Although the operation of the present invention is achieved as described above, the present invention is not limited to the above-described embodiment, and various modifications can be made, such as spread spectrum modulation of a modulated carrier signal, and the code used The series is not limited to four.
（ト） 発明の効果 本発明に依れば、拡散符号発生手段からのＭ個の拡散
符号の内、１つを情報信号に応じて選択して、この選択
された拡散符号にてスペクトラム拡散された信号を送信
し、受信側では、Ｍ個の符号と受信信号とを各々乗算
し、その乗算出力を加算して得られた信号に基づき位相
制御を行なうようにしたので、格別に同期制御用の符号
系列を送る必要がなく、情報信号の拡散用系列のS/Nの
向上を計れる。同時に、システム全体の構成が簡単にな
り、コストの低減が計れる。(G) Effects of the Invention According to the present invention, one of the M spreading codes from the spreading code generating means is selected according to the information signal, and the spread spectrum is spread by the selected spreading code. The received signal is multiplied by the M signals and the received signal, and the phase control is performed based on the signal obtained by adding the multiplied outputs. This eliminates the need to send a code sequence, and thus improves the S / N of the information signal spreading sequence. At the same time, the configuration of the entire system is simplified, and the cost can be reduced.
第１図は本発明システムの送信側を示す図、第２図は本
発明システムの受信側を示す図、第３図（ａ）（ｂ）は
送信側の動作を説明するための図、第４図は受信側の動
作を説明するための各部波形図である。 （１）……拡散符号発生器、（２）……デコーダ、
（３）……選択回路、（４）……拡散部、（５）……搬
送波信号発生回路、（６）……送信アンテナ（送信手
段）、（７）……受信アンテナ（受信手段）、（8a）
（8b）（8c）（8d）……符号発生部、（9a）（9b）（9
c）（9d）……乗算器、（10）……加算器、（11）……B
PF、（12）……位相制御回路、（13）……復調部。FIG. 1 is a diagram showing the transmitting side of the system of the present invention, FIG. 2 is a diagram showing the receiving side of the system of the present invention, and FIGS. 3 (a) and 3 (b) are diagrams for explaining the operation of the transmitting side. FIG. 4 is a waveform diagram of each part for explaining the operation on the receiving side. (1)... Spreading code generator, (2).
(3) ... selection circuit, (4) ... spreading unit, (5) ... carrier signal generation circuit, (6) ... transmission antenna (transmission means), (7) ... reception antenna (reception means), (8a)
(8b) (8c) (8d) Code signer, (9a) (9b) (9
c) (9d) ... multiplier, (10) ... adder, (11) ... B
PF, (12): Phase control circuit, (13): Demodulation unit.
Claims (1)
発生手段、この拡散符号発生手段からのＭ個の拡散符号
が供給され、情報信号に応じて１つの拡散符号を選択す
る選択手段、この選択手段にて選択された拡散符号と搬
送波信号発生手段からの搬送波信号に関する信号とに基
づき搬送波信号のスペクトラムを拡散するスペクトラム
拡散手段、このスペクトラム拡散手段からのスペクトラ
ム拡散信号を送信する送信手段を有する第１の装置と、 前記送信手段からのスペクトラム拡散信号を受信する受
信手段、前記拡散符号発生手段から出力される各拡散符
号と同一若しくは相関の大きいＭ個の符号を発生する符
号発生手段、前記受信手段からの受信信号と前記符号発
生手段からの各拡散符号とに基づき受信信号のスペクト
ラムを逆拡散するＭ個の逆拡散手段、このＭ個の逆拡散
手段の出力を加算する加算手段、この加算手段の出力端
に接続されたフィルタ手段、このフィルタ手段の出力に
基づき前記符号発生手段から出力される拡散符号の位相
を制御する位相制御手段を有する第２の装置とよりなる
スペクトラム拡散通信システム。1. Spreading code generating means for generating M different spreading codes, selecting means for receiving M spreading codes from the spreading code generating means and selecting one spreading code in accordance with an information signal; A spread spectrum means for spreading the spectrum of the carrier signal based on the spread code selected by the selection means and a signal related to the carrier signal from the carrier signal generation means; and a transmission means for transmitting a spread spectrum signal from the spread spectrum means. A first device having: a receiving unit for receiving a spread spectrum signal from the transmitting unit; a code generating unit for generating M codes having the same or a large correlation with each spread code output from the spread code generating unit; Despread the spectrum of the received signal based on the received signal from the receiving means and each spread code from the code generating means. M despreading means, addition means for adding the outputs of the M despreading means, filter means connected to the output end of the addition means, output from the code generation means based on the output of the filter means A spread spectrum communication system comprising a second device having phase control means for controlling a phase of a spread code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13875990A JP2714226B2 (en) | 1990-05-28 | 1990-05-28 | Spread spectrum communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13875990A JP2714226B2 (en) | 1990-05-28 | 1990-05-28 | Spread spectrum communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0435332A JPH0435332A (en) | 1992-02-06 |
| JP2714226B2 true JP2714226B2 (en) | 1998-02-16 |
Family
ID=15229521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13875990A Expired - Fee Related JP2714226B2 (en) | 1990-05-28 | 1990-05-28 | Spread spectrum communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2714226B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05227125A (en) * | 1992-02-14 | 1993-09-03 | Matsushita Electric Ind Co Ltd | Spread spectrum communication device |
| KR20030071899A (en) * | 2002-03-02 | 2003-09-13 | (주)엠투엔 | Method for manufacturing waveguide groove by using the dry etching |
| WO2007142492A2 (en) | 2006-06-09 | 2007-12-13 | Lg Electronics Inc. | Method of transmitting data in a mobile communicaiton system |
| EP2330861A3 (en) * | 2007-02-07 | 2011-08-10 | Sharp Kabushiki Kaisha | Communication terminal apparatus, communication control apparatus, wireless communication system, and resource allocation request method |
-
1990
- 1990-05-28 JP JP13875990A patent/JP2714226B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0435332A (en) | 1992-02-06 |
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