JPH07135473A - Transmitter-receiver - Google Patents
Transmitter-receiverInfo
- Publication number
- JPH07135473A JPH07135473A JP28304593A JP28304593A JPH07135473A JP H07135473 A JPH07135473 A JP H07135473A JP 28304593 A JP28304593 A JP 28304593A JP 28304593 A JP28304593 A JP 28304593A JP H07135473 A JPH07135473 A JP H07135473A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- code
- section
- information
- demodulation
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＯＡ機器等の間で情報デ
ータを無線伝送するための送受信機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transceiver for wirelessly transmitting information data between office automation equipment and the like.
【０００２】[0002]
【従来の技術】従来、事務所等でＯＡ機器間で情報デー
タの伝送を行なう方法としては、機器同士をケーブルで
接続する方法がとられてきた。しかし多数の機器をケー
ブルで接続するためには配線工事が必要であり、事務所
のレイアウト変更による機器の移動、新たな機器の導入
等が困難になる。これを解決する手段として無線電波を
使用する方法があるが、電波の出力電力、周波数の制
限、他の機器との干渉等の問題があり、なかなか普及に
に至っていない。2. Description of the Related Art Conventionally, as a method of transmitting information data between OA devices in an office or the like, a method of connecting devices with a cable has been used. However, wiring work is required to connect many devices with cables, which makes it difficult to move devices or introduce new devices due to changes in the office layout. There is a method of using a radio wave as a means for solving this, but there are problems such as output power of the radio wave, limitation of frequency, interference with other devices, etc., and it has not been widely spread.
【０００３】一方、特殊な用途に用いられる通信方式と
して、信号を広い帯域に拡散して電力密度の小さい電波
で送信する方式（スペクトル拡散方式）が知られてい
る。本方式は電力密度が小さいため、他の機器へ妨害を
与えにくい、擬似雑音符号により拡散／復調するため、
他の機器からの干渉を受けにくい等の特徴がある。スペ
クトル拡散通信では情報信号を広い帯域の拡散信号に変
調するために、一般にＰＮ符号という拡散符号が用いら
れている。スペクトル拡散を用いた送受信機ではこのＰ
Ｎ符号で拡散された信号を元の信号に復調する相関復調
回路が回路的に最も複雑になり、いくつかの復調方式の
提案がなされている。その中で最も簡単な構成で再現性
良く信号を復調する方式として、特開平４−３４６５２
８等に示すように相関復調にＳＡＷマッチドフィルタを
用いる方法が提案されている。On the other hand, as a communication system used for a special purpose, a system (spread spectrum system) in which a signal is spread over a wide band and transmitted by a radio wave having a low power density is known. Since this method has low power density, it does not easily interfere with other devices, and it spreads / demodulates using a pseudo-noise code.
It is characterized by being less susceptible to interference from other devices. In spread spectrum communication, a spread code called a PN code is generally used to modulate an information signal into a spread signal of a wide band. In a transmitter / receiver using spread spectrum, this P
The correlation demodulation circuit that demodulates the signal spread by the N code into the original signal is the most complicated in terms of circuit, and several demodulation methods have been proposed. As a method of demodulating a signal with the simplest structure among them and with good reproducibility, Japanese Patent Laid-Open No. 34652/1992
A method using a SAW matched filter for correlation demodulation has been proposed as shown in FIG.
【０００４】[0004]
【発明が解決しようとする課題】ＳＡＷマッチドフィル
タはＳＡＷの電極パターン製造時にあらかじめＰＮ符号
を電極パターンとして作ってしまうため、復調時にＰＮ
発生回路、同期回路等が不要となり、回路の簡易化、同
期時間の短縮等が図れる特徴があるが、ＰＮ符号が固定
となるために通信には１つの符号しか使えず、ＰＮ符号
を選択することで同時に複数の通信を行なう用途に用い
ることが困難という問題があった。The SAW matched filter creates a PN code as an electrode pattern in advance when the SAW electrode pattern is manufactured.
The generation circuit and the synchronization circuit are not required, which simplifies the circuit and shortens the synchronization time. However, since the PN code is fixed, only one code can be used for communication, and the PN code is selected. Therefore, there is a problem that it is difficult to use it for the purpose of performing a plurality of communications at the same time.
【０００５】[0005]
【課題を解決するための手段】そこで本発明では、上記
ＳＡＷマッチドフィルタの特徴を活かし、さらにＰＮ符
号を複数組設定可能な方式を提案する。１つの手段とし
てＳＡＷマッチドフィルタのＰＮ符号を構成した電極の
信号伝達方向両側に対向電極を設ける構成を提案する。
また２つ目の手段として、異なるＰＮ符号の電極を互い
に干渉しない様に配置する構成を提案する。In view of the above, the present invention proposes a method in which a plurality of sets of PN codes can be set by utilizing the characteristics of the SAW matched filter. As one means, a configuration is proposed in which counter electrodes are provided on both sides in the signal transmission direction of the electrodes forming the PN code of the SAW matched filter.
Further, as a second means, a configuration is proposed in which electrodes of different PN codes are arranged so as not to interfere with each other.
【０００６】[0006]
【作用】ＳＡＷマッチドフィルタの基本動作原理は、Ｐ
Ｎ符号により拡散変調された信号が励振電極に入力さ
れ、弾性表面波に変換されてあらかじめＰＮ符号に合わ
せてパターンを構成した電極に伝達され、受信信号と各
電極の励振方向が一致した瞬間に各励振電力が加算され
て出力に相関出力が現われる。一方、１周期のＰＮ符号
には対称性が無いために、前記入力電極とＰＮ符号を構
成している電極に対し逆方向の電極から入力された信号
に対しては、前記ＰＮ符号を構成している電極は逆配列
の別のＰＮ符号とみなすことができる。従ってＰＮ符号
を構成した電極の両側信号伝達方向に対向電極を設け、
一方を選択することで２つのＰＮ符号に対応可能な相関
復調回路を構成することができる。The basic operating principle of the SAW matched filter is P
A signal spread-modulated by the N code is input to the excitation electrode, is converted into a surface acoustic wave, and is transmitted to the electrode that has a pattern formed in advance according to the PN code. At the moment when the received signal and the excitation direction of each electrode match. Each excitation power is added and a correlation output appears in the output. On the other hand, since the PN code of one cycle has no symmetry, the PN code is formed for the signal input from the electrode in the opposite direction to the electrode forming the PN code with the input electrode. The holding electrode can be regarded as another PN code in the reverse arrangement. Therefore, opposite electrodes are provided on both sides of the electrodes forming the PN code in the signal transmission direction,
By selecting one, a correlation demodulation circuit that can handle two PN codes can be configured.
【０００７】また、弾性表面波は対向電極方向に信号が
伝達されることから、信号伝達方向に並行に間隔をおき
異なるＰＮ符号の電極を配置することにより、互いに干
渉が少なくすることができ、前に述べた信号伝達方向の
両側に設けた電極との組合せにより、多数のＰＮ符号の
中から選択して受信復調することが可能となる。Further, since the surface acoustic wave transmits a signal in the direction of the counter electrode, it is possible to reduce mutual interference by arranging electrodes of different PN codes at intervals in parallel in the signal transmitting direction. By combining with the electrodes provided on both sides in the signal transmission direction described above, it becomes possible to select from a large number of PN codes for reception and demodulation.
【０００８】[0008]
【実施例】以下本発明の１実施例を図１により説明す
る。図１において、１は送信部、２は受信部、３は情報
変調部、４は拡散変調部、５はＰＮ発生部、６は選択
部、７は情報入力部、８はアンテナ、９は選択部、１０
は相関復調部、１１は情報復調部、１２はアンテナ、１
３は情報出力部である。情報入力部７より送信部１に入
力された情報信号は情報変調部３にて情報変調された
後、拡散変調部４に入力される。一方、ＰＮ発生部５は
選択部６により拡散符号（以降ＰＮ符号と称す）が１つ
選択され、拡散変調部４に入力された情報変調信号はＰ
Ｎ発生部５で発生したＰＮ符号によりて広い帯域の信号
に拡散変調された後、アンテナ８より送信される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a transmitter, 2 is a receiver, 3 is an information modulator, 4 is a spread modulator, 5 is a PN generator, 6 is a selector, 7 is an information input unit, 8 is an antenna, and 9 is selected. Part, 10
Is a correlation demodulator, 11 is an information demodulator, 12 is an antenna, 1
Reference numeral 3 is an information output unit. The information signal input from the information input section 7 to the transmission section 1 is information-modulated by the information modulation section 3 and then input to the spread modulation section 4. On the other hand, in the PN generation unit 5, one spread code (hereinafter referred to as PN code) is selected by the selection unit 6, and the information modulation signal input to the spread modulation unit 4 is P.
The signal is spread-modulated into a wide band signal by the PN code generated by the N generation unit 5, and then transmitted from the antenna 8.
【０００９】こうして送信された信号はアンテナ１２で
受信され受信機２に入力される。受信機２では、選択部
９にて相関復調部１０の端子を選択し相関復調部１０の
ＰＮ符号を設定して、受信信号のＰＮ符号が設定したＰ
Ｎ符号と一致した時に復調信号が出力され、さらに情報
復調部１１にて元の情報信号に復調されて情報出力部１
３より出力される。The signal thus transmitted is received by the antenna 12 and input to the receiver 2. In the receiver 2, the selection unit 9 selects the terminal of the correlation demodulation unit 10 to set the PN code of the correlation demodulation unit 10, and the PN code of the received signal is set to P.
The demodulated signal is output when it matches the N code, and further demodulated to the original information signal by the information demodulation unit 11 to obtain the information output unit 1.
It is output from 3.
【００１０】本発明の送受信機を用いることにより、Ｐ
Ｎ符号が一致する信号に対しては情報が復調され、ＰＮ
符号が一致しない信号に対しては復調信号が現われない
ことから、ＰＮ符号を選択することで同時に複数組の送
受信機間で通信を行なうことができる。また、相関復調
部１０のＰＮ符号選択のための選択部９は単に相関復調
部１０の入力もしくは出力端子の接続を選択するだけの
簡単な構成で実現できるので、相関復調用にＰＮ信号発
生回路、符号同期回路等を用意する必要がなく、構成が
簡易化できる。By using the transceiver of the present invention, P
Information is demodulated for signals with the same N code, and PN
Since demodulated signals do not appear for signals whose codes do not match, selecting the PN code enables simultaneous communication between a plurality of sets of transceivers. Further, since the selecting unit 9 for selecting the PN code of the correlation demodulating unit 10 can be realized with a simple configuration of simply selecting the connection of the input or output terminal of the correlation demodulating unit 10, the PN signal generating circuit for the correlation demodulating It is not necessary to prepare a code synchronization circuit or the like, and the configuration can be simplified.
【００１１】図２に相関復調部１０にＳＡＷマッチドフ
ィルタを用いた場合の具体的回路の１実施例を示す。図
２において図１と同じ機能を有するものは同一符号を付
して説明を略す。１０はＳＡＷマッチドフィルタを用い
た相関復調部、１４はアンテナ１２で受信した信号の入
力端子、１５、１６は選択部９で選択された信号の相関
復調部１０への第１及び第２の信号入力端子、１７、１
８はＳＡＷマッチドフィルタ１０の第１及び第２の入力
励振電極、１９はＰＮ符号が設定された出力励振電極、
２０、２１はそれぞれ電極１７、電極１８から電極１９
へ向かう波の方向、２２は相関復調信号出力端子であ
る。FIG. 2 shows an embodiment of a concrete circuit when the SAW matched filter is used in the correlation demodulation unit 10. In FIG. 2, components having the same functions as those in FIG. Reference numeral 10 is a correlation demodulation unit using a SAW matched filter, 14 is an input terminal of a signal received by the antenna 12, 15 and 16 are first and second signals of the signal selected by the selection unit 9 to the correlation demodulation unit 10. Input terminals, 17, 1
8 is the first and second input excitation electrodes of the SAW matched filter 10, 19 is the output excitation electrode for which the PN code is set,
Reference numerals 20 and 21 denote electrodes 17, 18 to 19 respectively.
The direction of the wave toward the reference numeral 22 is a correlation demodulation signal output terminal.
【００１２】アンテナ１２にて受信した信号は入力端子
１４より選択部９に入力され、同選択部９にて相関復調
部１０の入力端子１５、１６の何れか一方に伝達され
る。入力端子１５が選択された場合、入力信号はＳＡＷ
マッチドフィルタの入力励振電極１７にて電気信号から
弾性表面波に変換され、２０に示す方向に伝達され、Ｐ
Ｎ符号が設定された出力電極１９に伝達される。ＰＮ符
号ははぼ同数の１／０符号がランダムに並んだ擬似雑音
符号であり、ＰＮ符号が一致するとすべての電極の励振
方向が同相となり、合成された復調信号が出力端子２２
より出力される。一方、ＰＮ符号が一致しない時は確立
的に同相と逆相の信号が同数となるため、互いに打ち消
し合い出力に復調信号は現われない。同様に選択部９に
て入力端子１６を選択した場合も入力信号はＳＡＷマッ
チドフィルタの入力励振電極１８にて電気信号から弾性
表面波に変換されて２１に示す方向に伝達され、出力電
極１９にてＰＮ符号の相関がとれると相関復調出力が出
力端子２２より出力される。ここでＳＡＷマッチドフィ
ルタにおける２０の方向の波と２１の方向の波の動作の
違いについて図３を用いて説明する。同図は図２のＳＡ
Ｗマッチドフィルタの出力電極１９の動作を示す図で、
符号は図２と同一符号を用いる。今、ＳＡＷマッチドフ
ィルタの出力電極１９に書き込まれた符号を電極１７に
近い側からａ1，ａ2，…，ａn-1，ａnとすると、電極１
７から入力される波２０は（ａn，ａn-1，…，ａ2，
ａ1）の順番のＰＮ符号で変調された入力信号が入力さ
れた時に復調される。一方、電極１８から入力される波
２１は（ａ1，ａ2，…，ａn-1，ａn）のＰＮ符号で変調
された入力信号が入力された時に復調される。従ってＰ
Ｎ符号に非対称の符号を選ぶことにより、入力端子１
７、１８で復調されるＰＮ符号を変えることができ、入
力端子を選択するだけで１つのＳＡＷマッチドフィルタ
で複数の符号を選択して復調できる。The signal received by the antenna 12 is input to the selection unit 9 from the input terminal 14 and is transmitted to either one of the input terminals 15 and 16 of the correlation demodulation unit 10 by the selection unit 9. When the input terminal 15 is selected, the input signal is SAW
The input excitation electrode 17 of the matched filter converts the electric signal into a surface acoustic wave, which is transmitted in the direction indicated by 20, and P
It is transmitted to the output electrode 19 in which the N code is set. The PN code is a pseudo noise code in which almost the same number of 1/0 codes are randomly arranged. When the PN codes match, the excitation directions of all electrodes are in phase, and the synthesized demodulated signal is output terminal 22.
Will be output. On the other hand, when the PN codes do not match, the in-phase and anti-phase signals have the same number, so they cancel each other out and no demodulated signal appears in the output. Similarly, when the input terminal 16 is selected by the selection unit 9, the input signal is converted from an electric signal into a surface acoustic wave by the input excitation electrode 18 of the SAW matched filter and transmitted in the direction indicated by 21, and is transmitted to the output electrode 19. When the correlation of the PN code is obtained, the correlation demodulation output is output from the output terminal 22. Here, the difference in operation between the wave in the 20 direction and the wave in the 21 direction in the SAW matched filter will be described with reference to FIG. This figure shows the SA of Figure 2.
It is a figure which shows operation | movement of the output electrode 19 of a W matched filter,
The same reference numerals as in FIG. 2 are used. Now, assuming that the codes written in the output electrode 19 of the SAW matched filter are a 1 , a 2 , ..., An -1 , a n from the side closer to the electrode 17, the electrode 1
The wave 20 input from 7 is (a n , a n-1 , ..., A 2 ,
When the input signal modulated by the PN code in the order of a 1 ) is input, it is demodulated. On the other hand, the wave 21 input from the electrode 18 is demodulated when the input signal modulated by the PN code of (a 1 , a 2 , ..., An -1 , a n ) is input. Therefore P
By selecting an asymmetric code for the N code, the input terminal 1
The PN code demodulated by 7 and 18 can be changed, and a plurality of codes can be selected and demodulated by one SAW matched filter only by selecting an input terminal.
【００１３】尚、本実施例は電極１７、１８を信号入
力、電極１９を復調出力としたが、入出力の関係を逆に
することも可能である。また、本実施例では特に示さな
かったが、選択部９で非選択端子に接地／開放等の終端
処理を行なうことでＳＡＷマッチドフィルタの復調効率
を向上させることができる。In this embodiment, the electrodes 17 and 18 are used for signal input and the electrode 19 is used for demodulation output, but the input / output relationship can be reversed. Although not particularly shown in this embodiment, the demodulation efficiency of the SAW matched filter can be improved by performing termination processing such as grounding / opening on the non-selected terminals in the selection unit 9.
【００１４】図４に本発明の他の１実施例を示す。同図
において図２と同じ機能を有するものは同一符号を付し
て説明を略す。２３、２４は選択部９の一部でそれぞれ
復調部１０の入力及び出力の選択部、２５、２６は異な
るＰＮ符号で構成された出力電極、２７、２８はそれぞ
れ電極１７、１８から電極２５に伝達される波２９、３
０はそれぞれ電極１７、１８から電極２６に伝達される
波、３１、３２はそれぞれ電極２５、２６のからの復調
出力端子である。FIG. 4 shows another embodiment of the present invention. In the figure, those having the same functions as those in FIG. Numerals 23 and 24 are parts of the selection unit 9, input and output selection units of the demodulation unit 10, respectively, 25 and 26 are output electrodes composed of different PN codes, and 27 and 28 are from the electrodes 17 and 18 to the electrode 25, respectively. Waves transmitted 29, 3
Reference numeral 0 is a wave transmitted from the electrodes 17 and 18 to the electrode 26, and reference numerals 31 and 32 are demodulation output terminals from the electrodes 25 and 26, respectively.
【００１５】図２で示した実施例と同様に、入力端子１
５、１６より入力された信号２７、２８は電極２５によ
りそれぞれ異なるＰＮ符号で復調され、出力端子３１よ
り出力される。同様に入力端子１５、１６より入力され
た信号２７、２８は電極２６によりそれぞれ異なるＰＮ
符号で復調され、出力端子３２より出力される。ＳＡＷ
マッチドフィルタ内で弾性表面波信号は励振電極の方向
に伝達されるため、電極２５と２６は互いに干渉しない
程度に距離をおいて配置し、出力電極の取りだし方向を
分離し、出力選択部２４を設けることで出力信号の廻り
込みによる電極２５と２６の干渉を低減している。本実
施例によれば、入力選択部２３及び出力選択部２４によ
り入出力の接続を選択するだけで４通りのＰＮ符号を選
択することが可能となる。Similar to the embodiment shown in FIG. 2, the input terminal 1
The signals 27 and 28 input from 5 and 16 are demodulated by the electrode 25 with different PN codes, and output from the output terminal 31. Similarly, the signals 27 and 28 input from the input terminals 15 and 16 are different depending on the electrodes 26.
It is demodulated with a code and output from the output terminal 32. SAW
Since the surface acoustic wave signal is transmitted in the direction of the excitation electrode in the matched filter, the electrodes 25 and 26 are arranged at a distance such that they do not interfere with each other, the extraction directions of the output electrodes are separated, and the output selection section 24 is separated. The provision reduces the interference between the electrodes 25 and 26 due to the sneak of the output signal. According to the present embodiment, it is possible to select four types of PN codes only by selecting the input / output connection by the input selection unit 23 and the output selection unit 24.
【００１６】尚、本実施例では電極２５と２６で入力電
極１７、１８を共用しているが、それぞれ分けることに
より、さらに干渉を低減することができる。また、図２
の実施例でも説明したように、信号入力と出力を逆転し
ても同様の効果をえることができる。また、本実施例で
は出力電極を２５、２６の２個としたが、更に増やすこ
とにより切替数を増すこともできる。また本実施例では
異なるＰＮ符号の電極を同一ＳＡＷ基板上に構成する実
施例を示したが、図２の実施例のＳＡＷマッチドフィル
タを複数個並べても同様の効果が得られるのは言うまで
もない。In this embodiment, the electrodes 25 and 26 share the input electrodes 17 and 18, but by separating them, the interference can be further reduced. Also, FIG.
As described in the above embodiment, the same effect can be obtained by reversing the signal input and output. Further, in this embodiment, two output electrodes 25 and 26 are used, but the number of switching can be increased by further increasing the number. Also, in this embodiment, an embodiment in which electrodes of different PN codes are formed on the same SAW substrate has been shown, but it goes without saying that the same effect can be obtained by arranging a plurality of SAW matched filters of the embodiment of FIG.
【００１７】[0017]
【発明の効果】本発明により相関復調にＳＡＷマッチド
フィルタを用いることにより、複雑なＰＮ発生回路や同
期回路、切替回路を用いることなく、簡単な構成で複数
のＰＮ符号の切替が可能な送受信機を構成することがで
きる。By using the SAW matched filter for correlation demodulation according to the present invention, a transceiver capable of switching a plurality of PN codes with a simple configuration without using a complicated PN generation circuit, synchronization circuit, or switching circuit. Can be configured.
【図１】本発明を用いた送受信機の送信部及び受信部の
１実施例を示す構成ブロック図である。FIG. 1 is a configuration block diagram showing an embodiment of a transmitter and a receiver of a transceiver using the present invention.
【図２】本発明を用いた受信機の相関復調部の実施例で
ある。FIG. 2 is an example of a correlation demodulation unit of a receiver using the present invention.
【図３】図２の相関復調部の動作説明図である。FIG. 3 is an operation explanatory diagram of a correlation demodulation unit in FIG.
【図４】本発明を用いた受信機の相関復調部の他の実施
例である。FIG. 4 is another embodiment of the correlation demodulation unit of the receiver using the present invention.
１…送信部、２…受信部、３…情報変調部、４…拡散変
調部、５…ＰＮ発生部、６…選択部、７…情報入力部、
８…アンテナ、９…選択部、１０…相関復調部、１１…
情報復調部、１２…アンテナ、１３…情報出力部、１４
…切替部信号入力端子、１５、１６…復調部信号入力端
子、１７、１８…入力励振電極、１９…出力励振電極、
２０、２１…弾性表面波、２２…復調出力端子、２３…
入力選択部、２４…出力選択部、２５、２６…出力励振
電極、２７、２８、２９、３０…弾性表面波、３１、３
２…復調出力端子1 ... Transmission unit, 2 ... Reception unit, 3 ... Information modulation unit, 4 ... Spread modulation unit, 5 ... PN generation unit, 6 ... Selection unit, 7 ... Information input unit,
8 ... Antenna, 9 ... Selector, 10 ... Correlation demodulator, 11 ...
Information demodulation unit, 12 ... Antenna, 13 ... Information output unit, 14
... switching section signal input terminal, 15, 16 ... demodulation section signal input terminal, 17, 18 ... input excitation electrode, 19 ... output excitation electrode,
20, 21 ... Surface acoustic wave, 22 ... Demodulation output terminal, 23 ...
Input selection section, 24 ... Output selection section, 25, 26 ... Output excitation electrodes, 27, 28, 29, 30 ... Surface acoustic waves, 31, 3
2 ... Demodulation output terminal
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡島 大仁 神奈川県横浜市戸塚区吉田町292番地株式 会社日立製作所ＡＶ機器事業部内 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Ohito Okajima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock Company, Hitachi Ltd. AV Equipment Division
Claims (4)
１の変調部により変調された信号を拡散符号に従い拡散
変調する第２の変調部と、該拡散変調に用いる拡散符号
を複数組具備したＰＮ発生部と、該ＰＮ発生部が送出す
る拡散符号を選択する選択部を具備した送信部と、複数
の拡散符号を選択して相関復調する第１の復調部と、該
第１の復調部の拡散符号を選択する選択部と、該第１の
復調部により復調された信号を情報復調する第２の復調
部を具備した受信部により構成されたことを特徴とする
送受信機。1. A first modulation section for modulating an information signal, a second modulation section for spreading-modulating the signal modulated by the first modulation section according to a spreading code, and a spreading code used for the spreading modulation. A plurality of PN generators, a transmitter having a selector that selects a spreading code transmitted by the PN generator, a first demodulator that selects a plurality of spreading codes and performs correlation demodulation, 1. A transceiver comprising a selection unit for selecting a spreading code of one demodulation unit and a reception unit including a second demodulation unit for information demodulating a signal demodulated by the first demodulation unit. .
の第１の復調部にＳＡＷマッチドフィルタを用いたこと
を特徴とする送受信機。2. The transceiver according to claim 1, wherein a SAW matched filter is used in the first demodulation section of the receiver.
マッチドフィルタは拡散符号情報を持つ第１の電極と、
波の伝達方向に対し該第１の電極をはさむ両側に構成さ
れた第２、第３の電極により構成され、該第２、第３の
電極の一方を選択することにより拡散符号を選択して復
調することを特徴とする送受信機。3. The transceiver according to claim 2, wherein the SAW
The matched filter has a first electrode having spread code information,
It is composed of second and third electrodes arranged on both sides sandwiching the first electrode with respect to the propagation direction of the wave, and the spread code is selected by selecting one of the second and third electrodes. A transceiver that demodulates.
マッチドフィルタは異なる拡散符号情報を持ち互いに干
渉しない複数の電極と、該電極の波の伝達方向に対向し
た１つもしくは複数の電極により構成され、該複数の拡
散符号情報を持つ電極及び対向電極の内から１組を選択
することにより拡散符号を選択して復調することを特徴
とする送受信機。4. The transceiver according to claim 2, wherein the SAW
The matched filter is composed of a plurality of electrodes that have different spread code information and do not interfere with each other, and one or more electrodes that face each other in the wave transmission direction of the electrodes. A transmitter / receiver characterized in that a spread code is selected and demodulated by selecting one set from among them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28304593A JP3293278B2 (en) | 1993-11-12 | 1993-11-12 | Transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28304593A JP3293278B2 (en) | 1993-11-12 | 1993-11-12 | Transceiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07135473A true JPH07135473A (en) | 1995-05-23 |
| JP3293278B2 JP3293278B2 (en) | 2002-06-17 |
Family
ID=17660502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28304593A Expired - Fee Related JP3293278B2 (en) | 1993-11-12 | 1993-11-12 | Transceiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3293278B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0756376A1 (en) * | 1995-07-24 | 1997-01-29 | Canon Kabushiki Kaisha | Matched filter, reception device and communication system using the same |
| JP2003523661A (en) * | 2000-01-31 | 2003-08-05 | クゥアルコム・インコーポレイテッド | PN generator for spread spectrum communication systems |
| DE10046414B4 (en) * | 1999-10-18 | 2004-04-01 | Fujitsu Ltd., Kawasaki | Method of manufacturing a surface acoustic wave device |
-
1993
- 1993-11-12 JP JP28304593A patent/JP3293278B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0756376A1 (en) * | 1995-07-24 | 1997-01-29 | Canon Kabushiki Kaisha | Matched filter, reception device and communication system using the same |
| US5815055A (en) * | 1995-07-24 | 1998-09-29 | Canon Kabushiki Kaisha | Matched filter with improved synchronous characteristics, and reception device and communication system using the same |
| DE10046414B4 (en) * | 1999-10-18 | 2004-04-01 | Fujitsu Ltd., Kawasaki | Method of manufacturing a surface acoustic wave device |
| JP2003523661A (en) * | 2000-01-31 | 2003-08-05 | クゥアルコム・インコーポレイテッド | PN generator for spread spectrum communication systems |
| US8611310B2 (en) | 2000-01-31 | 2013-12-17 | Qualcomm Incorporated | PN generators for spread spectrum communications systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3293278B2 (en) | 2002-06-17 |
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