JPH0435332A - Spread spectrum communication system - Google Patents
Spread spectrum communication systemInfo
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- JPH0435332A JPH0435332A JP2138759A JP13875990A JPH0435332A JP H0435332 A JPH0435332 A JP H0435332A JP 2138759 A JP2138759 A JP 2138759A JP 13875990 A JP13875990 A JP 13875990A JP H0435332 A JPH0435332 A JP H0435332A
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- 238000001228 spectrum Methods 0.000 title claims abstract description 41
- 230000002596 correlated effect Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
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Abstract
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。[Detailed description of the invention] (b) Industrial application field The present invention relates to spread spectrum communication systems.
（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（Ｐｓｅｕｄ。(b) Prior Art Conventionally, for example, a binary pseudo-noise code (Pseud) has a spectrum width sufficiently wider than that of an information signal.
Ｎｏ１ｓｅ 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１９７
８年１１月号参照）。No1se Code) (hereinafter referred to as PN code)
So-called spread spectrum communication is known in which a carrier signal with 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. (For example, Electronic Science 197
(See November 8th issue).
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５ＳＴＡ８９−３７
； １９８９年１１月８．９日参照）。In addition, in recent years, M
-ary type spread spectrum communication system has been proposed (for example, Institute of Electronics, Information and Communication Engineers 5STA89-37
; see November 8, 9, 1989).
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。To briefly explain this type of M-ary system, a spreading code generator is provided on the transmitting side to generate M different spreading codes, each having the same code length and generation rate and synchronized between the codes. A spreading code from this spreading code generator is selected according to the information signal, and the spectrum of the carrier signal is spread and transmitted using the selected spreading code.
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, the receiving side is provided with a code generator that generates M codes that are the same as or highly correlated with each spreading code from the spreading code generator, and multiplies the received signal and the code from the code generator, respectively. By doing this, 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, the carrier signal is regenerated only at the output of the multiplier that is supplied with a code that is the same as or highly correlated with the spreading code included in the received signal, so it is possible to restore the information signal by detecting this carrier signal. 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 In spread spectrum communication, in order to accurately reproduce information signals on the receiving side, it is essential to synchronize the codes generated on the receiving side with the codes 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
に送るようにしてし）る。In the above-mentioned M-ary system, the code sequences transmitted differ depending on the information, and it is difficult to establish synchronization using this, so a separate code sequence for synchronization is sent simultaneously 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, a part of the transmission power is allocated to the synchronization sequence, so the S/N of the information signal spreading sequence decreases slightly, leading to an increase in the data error rate during demodulation, and the power of the synchronization sequence is small. However, there was a problem in that it took a long time to acquire 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 a spreading code generating means for generating M different spreading codes.
a selection means for selecting one spreading code according to the information signal; a spectrum of the carrier signal is determined based on the spreading code selected by the selection means and the carrier signal from the carrier signal generation means; a first device having a spread spectrum means for transmitting a spread spectrum signal, and a transmission means for transmitting a spread spectrum signal from the spread spectrum means;
Receiving means for receiving the spread spectrum signal from the transmitting means; code generating means for generating M codes that are the same as or highly correlated with each spreading code output from the spreading code generating means; and a received signal from the receiving means. and M despreading means for despreading the spectrum of the received signal based on each spreading code from the code generation means, an addition means for adding the outputs of the M despreading means, and an output terminal of the addition means. The present invention is characterized in that it comprises a second device having a connected filter means and a phase control means for controlling the phase of the spreading code outputted from the code generation means based on the output of the filter 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) Effect 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 spectrum of the carrier signal is spread by the selected spreading code. On the receiving side, M codes that are the same as or highly correlated with the spreading code from the spreading code generating means are generated, and the spectrum of the received signal is despread based on these codes and the received signal. Next, the despread signals are added together and 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 this phase control information.
（へ）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（ＰＮｌ）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（ＩＣ）と、第４拡散
符号（ＰＮ４）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、各拡敢符号の符号長、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。(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 spreading code generator that generates M different spreading codes (four in the illustrated case), and a first spreading code generator (1) that generates a first spreading code (PNl). 1a), a second spreading code generator (1b) that generates a second spreading code (PN2), and a third spreading code (PN3).
) and a fourth spreading code generator (1d) that generates a fourth spreading code (PN4).
It is composed of. It is assumed that the code length and generation speed of each expansion code are exactly the same, and that each code is completely synchronized.
（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。(2) is a decoder that outputs a selection signal according to the information signal; (3) is a decoder that outputs one spreading code from the first to fourth spreading code generators as a selection signal from decoder (2); The selection circuit (4) is a spreading unit that spreads 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 is composed of vessels. (6) is a transmitting antenna that transmits a 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（ＰＮＩ）と同一若しくは相関の大きい第１符号（Ｐ
ＮＩ’）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（
ＩＣ）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（ＰＮ’） 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
（ＰＮｌ゛）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ＣＰＮ３゛）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、（１
１）は加算ｆＷ（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・デイ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 an embodiment of a receiver according to the system of the present invention. In Fig. 2, (7) is the receiving antenna, (
8a) is a first code (PNI) that is the same as or highly correlated with the first spread code (PNI) from the first spread code generator (1a).
The first code generator (8b) generates a second code (PN2') that is the same as or highly correlated with the second spread code (PN2) from the second spread code generator (1b). The second code generation section (8C) is the third spreading generation section (
(8d) is a fourth spreading code generating unit (1d) that generates a third code (PN') that is the same as or highly correlated with the third spreading code generating unit (PN3) from IC).
This is a fourth code generation unit that generates a fourth code (PN4°) that is the same as or highly correlated with the fourth spreading code (PN4) from the fourth spreading code (PN4). The first to fourth code generators constitute a code generator, and each code is assumed to have the same code length and generation speed, and to be synchronized. (9a) is a first multiplier that multiplies the received signal and the first code (PN1'); (9b) is the second multiplier that multiplies the received signal and the second code (PN2');
(9c) is a third multiplier that multiplies the received signal and the third code (CPN3'); (9d) is the third multiplier that multiplies the received signal and the fourth code (PN4).
'), the fourth multiplier (10) is an adder that adds the outputs of the first to fourth multipliers (9a) to (9d), (1
1) is a bandpass filter that is connected to the output end of the addition fW (10) and passes the carrier signal component, and (12) is a code output from the code generator based on the signal that has passed through the bandpass filter (11). A phase control circuit that controls the phase, such as a tau dither circuit or a delay locked loop circuit. (13) is a demodulator that demodulates the information signal.
次に、動作について説明する。Next, the operation will be explained.
今、伝達すべき情報が「００」、「０１」、「１０」、
「１１」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ｒｏ ＯＪのとき、第１拡散符号（ＰＮＩ
）を選択する信号を、情報「Ｏｌ」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（ＰＮ３）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",
If there are four "11", the decoder (2) outputs a selection signal for selecting a spreading code according to the information. That is, when the information ro OJ, the first spreading code (PNI
) when the information is "Ol", the signal to select the second spreading code (PN2) is when the information is "10",
When the signal for selecting the third spreading code (PN3) is "11", a signal for selecting the fourth spreading code (PN4) is output.
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（Ｐ
Ｎｌ）、第２拡散符号（ＰＮ２）第３拡散符号（ＰＮ３
）、第４拡散符号（Ｐ Ｎ ４ ）の順になる。When the information is generated in the order described above, the code output from the selection circuit (3) is the first spreading code (P
Nl), second spreading code (PN2), third spreading code (PN3
), and the fourth spreading code (P N 4 ).
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 selected by the selection circuit (3) in this manner is supplied to the spreading section (4), where it is multiplied by the carrier signal from the carrier signal generating circuit (5). 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 other hand, on the receiving side, the spread spectrum signal received by the receiving antenna (7) and the first to fourth code generators (8a)
to (8d), respectively, 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１１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（ＰＮＩ’）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), this spread spectrum signal is multiplied by the first code. As shown in FIG. 4(c), the carrier signal is reproduced at the output end of the No. 11 multiplier (9a) only during the period of the first spreading code included in the received signal. In addition, during the period from the second spreading code to the fourth spreading code, the signal whose spectrum has been spread by each spreading code is further spread by the first code (PNI'), and the carrier signal is Not played.
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 only during the period of the second spreading code, and the output terminal of the third multiplier (9C) is
A carrier wave signal is reproduced at the output end of the fourth multiplier (9d) only during the period of the third 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 wave signal is approximately continuously outputted to the output end of the adder (10), and this is converted to the BPF (11
) to remove unnecessary signal components,
By supplying the signal to the phase control circuit (12), it becomes possible to control the phase of the code generated from the code generator.
即ち、Ｂ Ｐ Ｆ （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。In other words, the output of B P F (11) changes in level depending on the phase relationship between the transmitting side code and the receiving side code, as in the case of conventional spread spectrum using a single code sequence. Phase control can be achieved using changes.
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。It is assumed 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 conventional case.
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つに限定される乙のではな
い。Although the operation of the present invention is achieved as described above, the present invention is not limited to the above embodiments, and various modifications such as modulating and spreading the spectrum of the carrier signal are possible.
Furthermore, the code sequences used are 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 spectrum is spread using the selected spreading code. On the receiving side, each of the M codes and the received signal are multiplied,
Since phase control is performed based on the signal obtained by adding the multiplication outputs, there is no need to send a special code sequence for synchronization control, and the S/N of the information signal spreading sequence can be improved. . At the same time, the overall system configuration becomes simpler and costs 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）＜ ８ ｃ ） （８ｄ ）−
符号発生部、（９ａ） （９ｂ）（９ｃ ） （９ｄ
） ・・’乗算器、（１０）・・・加算器、（１１）
・・・ＢＰＦ、（１２）・・・位相制御回路、（１３）
・・・復調部。
第１図Figure 1 is a diagram showing the transmitting side of the system of the present invention, Figure 2 is a diagram showing the receiving side of the system of the present invention, and Figures 3 (a) (b).
) is a diagram for explaining the operation on the transmitting side, and FIG. 4 is a waveform diagram of each part for explaining the operation on the receiving side. (1)... Spreading code generator, (2)... Decoder,
(3)...Selection circuit, (4)...Diffusion section, (5)...
...Carrier signal generation circuit, (6)...Transmission antenna (
transmitting means), (7)...receiving antenna (receiving means),
(8a) (8b)<8c) (8d)-
Code generation section, (9a) (9b) (9c) (9d
)...'Multiplier, (10)...Adder, (11)
... BPF, (12) ... Phase control circuit, (13)
... Demodulation section. Figure 1
Claims (1)
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; selection means for receiving the M spreading codes from the spreading code generating means and selecting one spreading code according to the information signal; a spectrum spreading means for spreading the spectrum of the carrier signal based on the spreading code selected by the means and a signal related to the carrier signal from the carrier signal generating means; and a transmitting means for transmitting the spread spectrum signal from the spectrum spreading means. 1, a receiving means for receiving the spread spectrum signal from the transmitting means, a code generating means for generating M codes that are the same as or highly correlated with each spreading code output from the spreading code generating means, and the receiving means. M despreading means for despreading the spectrum of the received signal based on the received signal from the means and each spreading code from the code generation means; addition means for adding the outputs of the M despreading means; A spread spectrum communication system comprising: a filter means connected to an output end of the filter means; and a second device having a phase control means for controlling the phase of the spread code output from the code generation means based on the output of the filter means.
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 true JPH0435332A (en) | 1992-02-06 |
| JP2714226B2 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) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05227125A (en) * | 1992-02-14 | 1993-09-03 | Matsushita Electric Ind Co Ltd | Communication equipment of spread spectrum system |
| KR20030071899A (en) * | 2002-03-02 | 2003-09-13 | (주)엠투엔 | Method for manufacturing waveguide groove by using the dry etching |
| WO2008096647A1 (en) * | 2007-02-07 | 2008-08-14 | Sharp Kabushiki Kaisha | Communication terminal device, communication control device, radio communication system, and resource allocation request method |
| JP2009540665A (en) * | 2006-06-09 | 2009-11-19 | エルジー エレクトロニクス インコーポレイティド | Data transfer method in mobile communication system |
-
1990
- 1990-05-28 JP JP13875990A patent/JP2714226B2/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05227125A (en) * | 1992-02-14 | 1993-09-03 | Matsushita Electric Ind Co Ltd | Communication equipment of spread spectrum system |
| KR20030071899A (en) * | 2002-03-02 | 2003-09-13 | (주)엠투엔 | Method for manufacturing waveguide groove by using the dry etching |
| US9705624B2 (en) | 2006-06-09 | 2017-07-11 | Evolved Wireless Llc | Method of transmitting data in a mobile communication system |
| US10187170B2 (en) | 2006-06-09 | 2019-01-22 | Evolved Wireless Llc | Detection in a communication system using a preamble sequence |
| US11336385B2 (en) | 2006-06-09 | 2022-05-17 | Evolved Wireless Llc | Preamble sequence for a random access channel |
| US10659183B2 (en) | 2006-06-09 | 2020-05-19 | Evolved Wireless Llc | Method of transmitting data in a mobile communication system |
| JP2009540665A (en) * | 2006-06-09 | 2009-11-19 | エルジー エレクトロニクス インコーポレイティド | Data transfer method in mobile communication system |
| US8218481B2 (en) | 2006-06-09 | 2012-07-10 | Lg Electronics Inc. | Method of transmitting data in a mobile communication system |
| US8683058B2 (en) | 2006-06-09 | 2014-03-25 | Lg Electronics Inc. | Method of transmitting data in a mobile communication system |
| US9037736B2 (en) | 2006-06-09 | 2015-05-19 | Evolved Wireless Llc | Method of transmitting data in a mobile communication system |
| US9241349B2 (en) | 2006-06-09 | 2016-01-19 | Evolved Wireless Llc | Method of transmitting data in a mobile communication system |
| US9560650B2 (en) | 2006-06-09 | 2017-01-31 | Evolved Wireless Llc | Method of transmitting data in a mobile communication system |
| JP4537485B2 (en) * | 2007-02-07 | 2010-09-01 | シャープ株式会社 | COMMUNICATION TERMINAL DEVICE, COMMUNICATION CONTROL DEVICE, RADIO COMMUNICATION SYSTEM, AND RESOURCE ALLOCATION REQUEST METHOD |
| WO2008096647A1 (en) * | 2007-02-07 | 2008-08-14 | Sharp Kabushiki Kaisha | Communication terminal device, communication control device, radio communication system, and resource allocation request method |
| JPWO2008096647A1 (en) * | 2007-02-07 | 2010-05-20 | シャープ株式会社 | COMMUNICATION TERMINAL DEVICE, COMMUNICATION CONTROL DEVICE, RADIO COMMUNICATION SYSTEM, AND RESOURCE ALLOCATION REQUEST METHOD |
| JP2010068535A (en) * | 2007-02-07 | 2010-03-25 | Sharp Corp | Mobile station and transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2714226B2 (en) | 1998-02-16 |
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