JPH09181646A - Optical radio modulator, optical radio demodulator and optical radio modem - Google Patents
Optical radio modulator, optical radio demodulator and optical radio modemInfo
- Publication number
- JPH09181646A JPH09181646A JP7336802A JP33680295A JPH09181646A JP H09181646 A JPH09181646 A JP H09181646A JP 7336802 A JP7336802 A JP 7336802A JP 33680295 A JP33680295 A JP 33680295A JP H09181646 A JPH09181646 A JP H09181646A
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- Prior art keywords
- signal
- optical wireless
- demodulation
- modulated wave
- spread spectrum
- Prior art date
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、光無線変調装置
と、光無線復調装置と、光無線変復調装置とに係り、特
に光無線多重伝送を可能とした光無線変調装置と、光無
線復調装置と、光無線変復調装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical wireless modulator, an optical wireless demodulator, and an optical wireless modulator / demodulator, and more particularly to an optical wireless modulator that enables optical wireless multiplex transmission and an optical wireless demodulator. And an optical wireless modulator / demodulator.
【0002】[0002]
【従来の技術】従来の光無線変復調装置として、家庭用
AV機器(家庭用オーディオ・ビデオ機器)等の遠隔操
作に使用されている光リモートコントロール装置(光リ
モコン装置)が知られている。図8に従来例として光リ
モコン装置(光リモートコントロール装置)の光無線変
調装置の要部ブロック構成図を示す。2. Description of the Related Art As a conventional optical wireless modulation / demodulation device, an optical remote control device (optical remote control device) used for remote control of home AV equipment (home audio / video equipment) is known. FIG. 8 shows a block diagram of a main part of an optical wireless modulator of an optical remote controller (optical remote controller) as a conventional example.
【0003】図8において、光リモコン装置(光リモー
トコントロール装置)の光無線変調装置は、キーボード
40と、搬送波変調手段41と、駆動手段42と、光無
線用発光手段43とから構成する。In FIG. 8, an optical wireless modulator of an optical remote controller (optical remote controller) comprises a keyboard 40, a carrier wave modulating means 41, a driving means 42 and an optical wireless light emitting means 43.
【0004】キーボード40はデータD(t)を搬送波
変調手段41に出力する。搬送波変調手段41はデータ
D(t)に基づいて搬送波をFSK(FREQUENCYSHIFT K
EYING)変調またはPSK(PHASE SHIFT KEYING)変調
したデータ変調波SM(t)を駆動手段42に出力す
る。駆動手段42はデータ変調波SM(t)に基づいて
光無線用発光手段43(LED)の駆動に適した駆動デ
ータ変調波SM1(t)を作り、この駆動データ変調波S
M1(t)を光無線用発光手段43(LED)に出力す
る。光無線用発光手段43(LED)は駆動データ変調
波SM1(t)の電気信号を光信号に変換した光無線変調
波SC(t)を放射する。The keyboard 40 outputs the data D (t) to the carrier wave modulating means 41. The carrier wave modulation means 41 shifts the carrier wave to FSK (FREQUENCYSHIFT K) based on the data D (t).
The data modulating wave S M (t) modulated by EYING) or PSK (PHASE SHIFT KEYING) is output to the driving means 42. The drive means 42 creates a drive data modulated wave S M1 (t) suitable for driving the optical wireless light emitting means 43 (LED) based on the data modulated wave S M (t), and the drive data modulated wave S M1 (t) is generated.
The M1 (t) is output to the optical wireless light emitting means 43 (LED). The optical wireless light emitting means 43 (LED) emits an optical wireless modulated wave S C (t) obtained by converting an electric signal of the drive data modulated wave S M1 (t) into an optical signal.
【0005】図9に従来例として光リモコン装置(光リ
モートコントロール装置)の光無線復調装置の要部ブロ
ック構成図を示す。FIG. 9 shows a block diagram of a main part of an optical wireless demodulation device of an optical remote control device (optical remote control device) as a conventional example.
【0006】図9において、光リモコン装置(光リモー
トコントロール装置)の光無線復調装置は、受光手段4
4と、復調手段45とから構成する。受光手段44はピ
ンフォトダイオードが使用され、放射された光無線変調
波SC(t)を受光して電気信号に変換したデータ変調
波SD(t)を復調手段45に出力する。復調手段45
はデータ変調波SD(t)を復調して光無線変調装置の
キーボード40からのデータD(t)を復調データDD
(t)として出力する。In FIG. 9, an optical wireless demodulation device of an optical remote control device (optical remote control device) includes a light receiving means 4
4 and demodulation means 45. A pin photodiode is used as the light receiving unit 44, and the radiated optical wireless modulation wave S C (t) is received and converted into an electric signal, and the data modulation wave S D (t) is output to the demodulation unit 45. Demodulation means 45
Is the demodulated data modulated wave S D (t) to demodulate the data D (t) from the keyboard 40 of the optical wireless modulator into the demodulated data D D.
Output as (t).
【0007】[0007]
【発明が解決しようとする課題】図10にオフィスや一
般家庭に使用されている高周波蛍光灯の不要輻射特性の
一例を示す。図10に示すように、高周波蛍光灯の基本
スペクトルは数100KHZ(イ)であるが、その高周
波成分は数MHZ(ロ)の周波数帯にまで及んでいるの
で、従来の光無線変調装置においては、高周波蛍光灯の
高周波成分との干渉を避けるために使用する搬送波周波
数帯が数MHZから10数MHZの高周波帯となる課題が
ある。FIG. 10 shows an example of unnecessary radiation characteristics of a high frequency fluorescent lamp used in offices and general households. As shown in FIG. 10, although the basic spectrum of the high frequency fluorescent lamp is several 100KH Z (i), since the high-frequency component is extends to a frequency band of several MH Z (b), a conventional optical wireless modulator in, there is a problem that the carrier frequency band to be used to avoid interference with the high-frequency component of a high frequency fluorescent lamp is a high frequency band of 10 number MH Z several MH Z.
【0008】また、光無線変調装置の光無線用発光手段
(LED)は、駆動電力に対する発光効率が一般に低い
ので、瞬時的に大きな駆動電流を光無線用発光手段に流
して発光量を増加させ、発熱量を小さく抑えるため方形
波駆動またはパルス駆動が行われている。図11に光無
線変調装置の光無線変調波の周波数スペクトル特性の一
例を示す。図11に示すように、光無線用発光手段をパ
ルス電流駆動するためにパルス電流によってデータ変調
波SM(t)の周波数SM(f)を含む広い周波数帯域に
亙る不要輻射スペクトルが発生するので、多重方式で有
力視される周波数分割多重方式による光無線変復調装置
の限られた空間内での複数の使用は光無線変復調装置間
で周波数的に干渉が生じて実用にならない課題があるFurther, since the optical wireless light emitting means (LED) of the optical wireless modulator generally has a low luminous efficiency with respect to the driving power, a large driving current is momentarily supplied to the optical wireless light emitting means to increase the light emission amount. Square wave drive or pulse drive is used to suppress the amount of heat generation. FIG. 11 shows an example of frequency spectrum characteristics of the optical wireless modulated wave of the optical wireless modulator. As shown in FIG. 11, in order to drive the optical wireless light emitting means with a pulse current, an unnecessary radiation spectrum over a wide frequency band including the frequency S M (f) of the data modulation wave S M (t) is generated by the pulse current. Therefore, a plurality of uses of the optical wireless modulator / demodulator by the frequency division multiplexing method, which is considered to be a promising multiplex method, in a limited space causes a problem in frequency interference between the optical wireless modulators / demodulators, which is not practical.
【0009】また、多重方式として時分割多重方式によ
る光無線変復調装置は、各光無線変復調装置間で同期関
係が保たれている必要があり、このことが大きな制限と
なって普及するには至っていない。非同期の時分割多重
方式による光無線変復調装置の限られた空間内での複数
使用は、複数の光無線変復調装置間で同期関係がないた
め光無線変復調装置間の干渉が生じるので実用にならな
い課題がある。In addition, in the optical wireless modulator / demodulator using the time division multiplex as the multiplexing system, it is necessary for each optical wireless modulator / demodulator to maintain a synchronous relationship, which is a major limitation and has not spread. Not in. A plurality of uses of the optical wireless modulator / demodulator by the asynchronous time division multiplex system in a limited space cannot be put into practical use because there is no synchronization between the optical wireless modulators / demodulators, which causes interference between the optical wireless modulators / demodulators. There is.
【0010】しかるに、従来の光無線変復調装置の限ら
れた空間内での複数使用は実用にならない課題がある。However, there is a problem that a plurality of conventional optical wireless modulators / demodulators cannot be used practically in a limited space.
【0011】この発明は上記課題を解決するためになさ
れたもので、その目的は、限られた区間内での複数の光
無線変復調装置の同時使用を可能にし、他の電子機器に
妨害を与えず、かつ妨害排除能力が高く信頼性のある光
無線変復調装置を提供することにある。The present invention has been made to solve the above problems, and an object thereof is to enable a plurality of optical wireless modulator / demodulators to be used simultaneously within a limited section and to interfere with other electronic equipment. Another object of the present invention is to provide a reliable optical wireless modulator / demodulator with high interference rejection capability.
【0012】[0012]
【課題を解決するための手段】請求項1に係る複数の光
無線変復調装置は、それぞれ異なる拡散符号を有し、符
号分割多重機能を有することを特徴とする。A plurality of optical wireless modulators / demodulators according to a first aspect of the present invention have different spreading codes and have a code division multiplexing function.
【0013】本発明に係る光無線変復調装置は、請求項
1記載の複数の光無線変復調装置に、それぞれ異なる拡
散符号を有し、符号分割多重機能を有するので、LED
の高効率駆動下において不可能であった複数の光無線変
復調装置を限られた空間範囲内で符号分割多重として同
時刻、同周波数帯で使用することができる。In the optical wireless modulator / demodulator according to the present invention, the plurality of optical wireless modulators / demodulators according to claim 1 have different spreading codes and have a code division multiplexing function.
It is possible to use a plurality of optical wireless modulators / demodulators, which was not possible under the high efficiency driving of the above, as code division multiplexing in the limited space range at the same time and the same frequency band.
【0014】請求項2に係る複数の光無線変復調装置
は、光無線変調装置に指向性を有する光無線用発光手段
を備えたことを特徴とする。A plurality of optical wireless modulators / demodulators according to a second aspect of the present invention are characterized in that the optical wireless modulator is provided with optical wireless light emitting means having directivity.
【0015】本発明に係る光無線変復調装置は、請求項
2記載の複数の光無線変調装置に指向性を有する光無線
用発光手段を備えたので、符号分割多重と光空間分割多
重を併せ持つ多重方式ができ、限られた空間内でより多
くの光無線変復調装置を使用することができる。Since the optical wireless modulator / demodulator according to the present invention includes the optical wireless light emitting means having directivity in the plurality of optical wireless modulators according to the second aspect, the multiplex having both the code division multiplexing and the optical space division multiplexing. System, and more optical wireless modulators / demodulators can be used in a limited space.
【0016】請求項3に係る光無線変調装置は、情報信
号をスペクトル拡散変調したスペクトル拡散変調波を出
力するスペクトル拡散変調手段と、スペクトル拡散変調
波に基づいた駆動信号を出力する駆動手段と、駆動信号
を光信号に変換してこの光信号を光無線変調波として送
出する発光手段と、から構成し、スペクトル拡散変調手
段は、情報信号を変調した1次変調波を出力する情報変
調手段と、1次変調波を分周してクロック信号を出力す
る分周手段と、クロック信号に基づいて拡散符号を発生
してこの拡散符号を出力する拡散符号発生手段と、1次
変調波と拡散符号とを乗算したスペクトル拡散変調波を
出力する乗算手段と、を備えたことを特徴とする。An optical wireless modulator according to a third aspect of the present invention comprises a spread spectrum modulating means for outputting a spread spectrum modulated wave obtained by spread spectrum modulating an information signal, and a driving means for outputting a drive signal based on the spread spectrum modulated wave. And a light emitting means for converting the drive signal into an optical signal and transmitting the optical signal as an optical wireless modulation wave, and the spread spectrum modulation means is an information modulation means for outputting a primary modulation wave obtained by modulating the information signal. Frequency dividing means for dividing the primary modulated wave to output a clock signal, spreading code generating means for generating a spreading code based on the clock signal and outputting the spreading code, primary modulated wave and spreading code And multiplying means for outputting a spread spectrum modulated wave multiplied by and.
【0017】本発明に係る光無線変調装置は、請求項3
記載の光無線変調装置に、情報信号をスペクトル拡散変
調したスペクトル拡散変調波を出力するスペクトル拡散
変調手段と、スペクトル拡散変調波に基づいた駆動信号
を出力する駆動手段と、駆動信号を光信号に変換してこ
の光信号を光無線変調波として送出する発光手段と、を
備え、スペクトル拡散変調手段は、情報信号を変調した
1次変調波を出力する情報変調手段と、1次変調波を分
周してクロック信号を出力する分周手段と、クロック信
号に基づいて拡散符号を発生してこの拡散符号を出力す
る拡散符号発生手段と、1次変調波と拡散符号とを乗算
したスペクトル拡散変調波を出力する乗算手段と、を備
えたので、電気機器等からの不要輻射による妨害に強く
安定した送信および受信ができ、またスペクトル拡散変
調波の電力密度が小さいことから、他の電気機器に与え
る影響を少なくすることができる。An optical wireless modulator according to the present invention comprises:
In the optical wireless modulator described above, a spread spectrum modulation means for outputting a spread spectrum modulated wave obtained by spread spectrum modulating an information signal, a driving means for outputting a drive signal based on the spread spectrum modulated wave, and a drive signal as an optical signal And a light emitting means for converting and transmitting the optical signal as an optical wireless modulated wave, wherein the spread spectrum modulating means divides the primary modulated wave with the information modulating means for outputting a primary modulated wave obtained by modulating the information signal. Frequency division means for frequency-dividing and outputting a clock signal, spreading code generation means for generating a spreading code based on the clock signal and outputting the spreading code, and spread spectrum modulation in which the primary modulated wave and the spreading code are multiplied Since it is provided with a multiplying unit that outputs a wave, stable and stable transmission and reception can be performed against interference due to unnecessary radiation from electric equipment and the power density of the spread spectrum modulated wave can be improved. Since again, it is possible to reduce the influence on other electric devices.
【0018】請求項4に係る光無線復調装置は、光無線
変調波を受光して電気信号に変換する受光手段と、受光
手段の出力をバンドパスフィルタを介して得られるスペ
クトル拡散変調波を復調用拡散符号を用いて乗算により
逆拡散復調して逆拡散復調信号を出力する逆拡散復調手
段と、逆拡散復調信号をバンドパスフィルタと、増幅手
段と、を介して得られる1次変調波を1次復調して情報
信号を出力する、位相比較手段、ループフィルタ、電圧
制御発振手段からなる1次復調手段と、を備え、また逆
拡散復調手段に、スライディング相関用信号を発生して
出力するスライディング相関用発振手段と、1次変調波
を分周してクロック信号を出力する分周手段と、位相比
較手段の出力信号を2値化して切換信号を出力する同期
制御手段と、切換信号に基づいてスライディング相関用
信号とクロック信号を切換える切換手段と、クロック信
号に基づいて復調用拡散信号を出力する拡散用符号発生
手段と、スペクトル拡散変調波と復調用拡散信号との乗
算をして逆拡散復調信号を出力する乗算手段と、を備え
たことを特徴とする。An optical wireless demodulation device according to a fourth aspect of the present invention demodulates a light receiving means for receiving the optical wireless modulated wave and converting it into an electric signal, and a spread spectrum modulated wave obtained by passing the output of the light receiving means through a bandpass filter. Despread demodulation means for performing despread demodulation by multiplication using the spreading code for use to output a despread demodulation signal, a despread demodulation signal for a primary modulated wave obtained through a bandpass filter, and an amplification means. And a primary demodulation unit including a phase comparison unit, a loop filter, and a voltage controlled oscillation unit for performing primary demodulation and outputting an information signal, and a sliding correlation signal is generated and output to the despreading demodulation unit. Oscillation means for sliding correlation, frequency division means for dividing the primary modulated wave to output a clock signal, synchronization control means for binarizing the output signal of the phase comparison means and outputting a switching signal, and switching Switching means for switching between the sliding correlation signal and the clock signal based on the signal, the spreading code generating means for outputting the demodulation spreading signal based on the clock signal, and the multiplication of the spread spectrum modulated wave and the demodulation spreading signal. And a multiplying unit for outputting a despread demodulation signal.
【0019】本発明に係る光無線復調装置は、請求項4
記載の光無線復調装置に、光無線変調波を受光して電気
信号に変換する受光手段と、受光手段の出力をバンドパ
スフィルタを介して得られるスペクトル拡散変調波を復
調用拡散符号を用いて乗算により逆拡散復調して逆拡散
復調信号を出力する逆拡散復調手段と、逆拡散復調信号
をバンドパスフィルタと、増幅手段と、を介して得られ
る1次変調波を1次復調して情報信号を出力する、位相
比較手段、ループフィルタ、電圧制御発振手段からなる
1次復調手段と、を備え、また逆拡散復調手段に、スラ
イディング相関用信号を発生して出力するスライディン
グ相関用発振手段と、1次変調波を分周してクロック信
号を出力する分周手段と、位相比較手段の出力信号を2
値化して切換信号を出力する同期制御手段と、切換信号
に基づいてスライディング相関用信号とクロック信号を
切換える切換手段と、クロック信号に基づいて復調用拡
散信号を出力する拡散用符号発生手段と、スペクトル拡
散変調波と復調用拡散信号との乗算をして逆拡散復調信
号を出力する乗算手段と、を備えたので、電気機器等か
らの不要輻射による妨害に強く安定した送信および受信
ができ、またスペクトル拡散変調波の電力密度が小さい
ことから、他の電気機器に与える影響を少なくすること
ができる。An optical wireless demodulation device according to the present invention comprises:
In the optical wireless demodulation device described, the light receiving means for receiving the optical wireless modulated wave and converting it into an electric signal, and the spread spectrum modulated wave obtained by outputting the output of the light receiving means through a bandpass filter by using a spreading code for demodulation. Information is obtained by first demodulating a primary modulated wave obtained through a despread demodulation means for performing despread demodulation by multiplication and outputting a despread demodulated signal, a despread demodulated signal through a bandpass filter, and an amplifying means. And a primary demodulating means including a phase comparing means, a loop filter and a voltage controlled oscillating means for outputting a signal, and a sliding correlation oscillating means for generating and outputting a sliding correlation signal to the despreading demodulating means. The frequency dividing means for dividing the primary modulated wave to output a clock signal and the output signal of the phase comparing means are divided into two.
Synchronization control means for digitizing and outputting a switching signal; switching means for switching a sliding correlation signal and a clock signal based on the switching signal; spreading code generating means for outputting a demodulation spreading signal based on the clock signal; Since a multiplication means for multiplying the spread spectrum modulated wave and the spread signal for demodulation and outputting the despread demodulated signal is provided, stable and stable transmission and reception can be performed against interference due to unnecessary radiation from electric equipment, Further, since the power density of the spread spectrum modulated wave is small, it is possible to reduce the influence on other electric devices.
【0020】請求項5に係る光無線変調装置は、請求項
1、または請求項2、または請求項3記載の光無線変調
装置を、乗算手段に入力される1次変調波と拡散符号発
生手段に入力されるクロック信号とが同期した同期型拡
散変調としたことを特徴とする。An optical wireless modulator according to a fifth aspect of the present invention is the optical wireless modulator according to any one of the first, second, and third aspects, wherein the primary modulated wave input to the multiplying means and the spread code generating means. It is characterized in that it is a synchronous spread modulation that is synchronized with the clock signal input to.
【0021】本発明に係る光無線変復調装置は、請求項
5記載の光無線変調装置を、乗算手段に入力される1次
変調波と拡散符号発生手段に入力されるクロック信号と
が同期した同期型拡散変調としたので、簡単な構成で、
簡潔な回路動作により光無線変調装置の実用化ができ
る。An optical wireless modulator / demodulator according to the present invention is the optical wireless modulator according to claim 5, wherein the primary modulated wave input to the multiplication means and the clock signal input to the spread code generation means are synchronized. Type diffusion modulation, so with a simple configuration,
The optical wireless modulator can be put to practical use by a simple circuit operation.
【0022】請求項6に係る光無線復調装置は、請求項
1、または請求項2、または請求項4記載の光無線復調
装置を、乗算手段に入力されるスペクトル拡散変調波と
拡散符号発生手段に入力されるクロック信号とが同期し
た同期型逆拡散復調としたことを特徴とする。An optical wireless demodulating device according to a sixth aspect is the optical wireless demodulating device according to any one of the first, second and fourth aspects, in which a spread spectrum modulated wave and a spread code generating means input to a multiplying means are provided. The synchronous despreading demodulation is synchronized with the clock signal input to the.
【0023】本発明に係る光無線復調装置は、請求項6
記載の光無線変調装置を、乗算手段に入力されるスペク
トル拡散変調波と拡散符号発生手段に入力されるクロッ
ク信号とが同期した同期型逆拡散復調としたので、簡単
な構成で、簡潔な回路動作により光無線復調装置の実用
化ができる。An optical wireless demodulation device according to the present invention comprises:
Since the optical wireless modulator described above is a synchronous despread demodulation in which the spread spectrum modulated wave input to the multiplication means and the clock signal input to the spread code generation means are synchronized, a simple configuration and a simple circuit The operation makes it possible to put the optical wireless demodulation device into practical use.
【0024】[0024]
【発明の実施の形態】以下、本発明を図面に示す実施形
態に基づいて説明する。図1は本発明に係る光無線変調
装置の要部ブロック構成図である。図2は本発明に係る
光無線変調装置の1次変調波M(t)、スペクトル拡散
変調波SM(t)の周波数スペクトル図である。図1に
おいて、光無線変調装置1は、情報変調手段11、分周
手段12、拡散符号発生手段13、乗算手段14とから
なるスペクトル拡散変調手段10と、駆動手段15と、
発光手段16とを備える。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments shown in the drawings. FIG. 1 is a block diagram of the essential parts of an optical wireless modulator according to the present invention. FIG. 2 is a frequency spectrum diagram of the primary modulation wave M (t) and the spread spectrum modulation wave S M (t) of the optical wireless modulator according to the present invention. In FIG. 1, the optical wireless modulator 1 includes a spread spectrum modulator 10 including an information modulator 11, a frequency divider 12, a spread code generator 13, and a multiplier 14, and a driver 15.
And a light emitting means 16.
【0025】情報変調手段11はデジタルの情報信号D
(t)に基づいて1次変調として搬送波周波数f0を変
調指数0.5のMSK(ミニマムシフトキーイング)変
調をした1次変調波M(t)を分周手段12と乗算手段
14に出力する。図2の[A]に狭帯域変調波である1
次変調波M(t)のスペクトルを示す。The information modulating means 11 is a digital information signal D.
Based on (t), the carrier frequency f 0 is subjected to MSK (minimum shift keying) modulation with a modulation index of 0.5 as primary modulation, and a primary modulated wave M (t) is output to the frequency dividing means 12 and the multiplying means 14. . In [A] of FIG.
The spectrum of the next modulated wave M (t) is shown.
【0026】分周手段12は1次変調波M(t)を分周
して搬送波および変調指数が分周数分の1に下がったク
ロック信号MF(t)を拡散符号発生手段13に出力す
る。The frequency dividing means 12 divides the primary modulated wave M (t) and outputs a carrier signal and a clock signal M F (t) whose modulation index is reduced by a factor of 1 to the spread code generating means 13. To do.
【0027】拡散符号発生手段13は入力されたクロッ
ク信号MF(t)に基づいて情報信号D(t)の伝送レ
ートに比べて高速なM系列符号を発生し、このM系列符
号を拡散符号p(t)として乗算手段14に出力する。The spread code generating means 13 generates an M sequence code that is faster than the transmission rate of the information signal D (t) based on the input clock signal M F (t), and uses this M sequence code as the spread code. It is output to the multiplication means 14 as p (t).
【0028】乗算手段14は乗算器またはダブルバラン
スドミキサ(DBM)から成り、2次変調として変調波
M(t)と拡散符号p(t)との乗算をし、その結果M
(t)×p(t)をスペクトル拡散変調波SM(t)と
して駆動手段15に出力する。図2の[B]に広帯域変
調波であるスペクトル拡散変調波SM(t)のスペクト
ルを示す。The multiplying means 14 is composed of a multiplier or a double balanced mixer (DBM) and multiplies the modulated wave M (t) by the spread code p (t) as the secondary modulation, and as a result M
(T) × p (t) is output to the driving means 15 as a spread spectrum modulated wave S M (t). FIG. 2B shows the spectrum of the spread spectrum modulated wave S M (t) which is a wide band modulated wave.
【0029】駆動手段15はスペクトル拡散変調波SM
(t)に基づいた駆動信号SM1(t)を発光手段16に
出力し、発光手段16を3次変調である光強度変調して
発光手段16から光無線変調波SC(t)を発光出力す
る。The driving means 15 is a spread spectrum modulated wave S M.
The drive signal S M1 (t) based on (t) is output to the light emitting means 16, the light emitting means 16 is light intensity modulated as the third-order modulation, and the light emitting means 16 emits the optical wireless modulated wave S C (t). Output.
【0030】図3は本発明に係る光無線復調装置の要部
ブロック構成図である。図3において、光無線復調装置
2は、受光手段20、逆拡散復調手段21、バンドパス
フィルタ29、振幅制限増幅手段30、1次復調手段3
1、ローパスフィルタ32と、を備える。逆拡散復調手
段21は、バンドパスフィルタ22、乗算手段23、ス
ライディング相関用発振手段24、分周手段25、バン
ドパスフィルタ33、同期制御手段26、切換手段2
7、拡散用符号発生手段28とから構成する。1次復調
手段31は、位相比較手段31A、ループフィルタ31
B、電圧制御発振手段31Cとから構成する。FIG. 3 is a block diagram of the essential parts of an optical wireless demodulator according to the present invention. In FIG. 3, the optical wireless demodulating device 2 includes a light receiving unit 20, a despreading demodulating unit 21, a band pass filter 29, an amplitude limiting amplifying unit 30, a primary demodulating unit 3.
1, a low-pass filter 32. The despreading demodulation means 21 includes a bandpass filter 22, a multiplication means 23, a sliding correlation oscillation means 24, a frequency division means 25, a bandpass filter 33, a synchronization control means 26, and a switching means 2.
7 and spreading code generating means 28. The primary demodulation means 31 includes a phase comparison means 31A and a loop filter 31.
B, and a voltage controlled oscillator 31C.
【0031】受光手段20はピンフォトダイオード等の
受光手段で光信号である光無線変調波SC(t)を受光
して電気信号に変換したスペクトル拡散変調波S
D1(t)をバンドパスフィルタ22に出力する。バンド
パスフィルタ22はスペクトル拡散変調波SD1(t)の
所定の周波数帯域のみ通過させて帯域外の不要成分を取
除いたスペクトル拡散変調波SD(t)を乗算手段23
に出力する。The light receiving means 20 receives the optical wireless modulated wave S C (t) which is an optical signal by a light receiving means such as a pin photodiode and converts it into an electric signal, which is a spread spectrum modulated wave S.
D1 (t) is output to the bandpass filter 22. The bandpass filter 22 multiplies the spread spectrum modulated wave S D (t) by passing only a predetermined frequency band of the spread spectrum modulated wave S D1 (t) and removing unnecessary components outside the band.
Output to
【0032】スライディング相関用発振手段24は逆拡
散復調を行うに必要な初期同期捕捉をするために周波数
(f0/n+△f)のスライディング相関用信号G
(t)をクロック信号として切換手段27に出力する。
分周手段25は1次復調手段31の電圧制御発振手段3
1Cからの出力信号MDC(t)を1/nに分周したクロ
ック信号MDF(t)を切換手段27に出力する。The sliding correlation oscillating means 24 has a frequency (f 0 / n + Δf) of the sliding correlation signal G for acquiring the initial synchronization necessary for performing the despread demodulation.
(T) is output to the switching means 27 as a clock signal.
The frequency divider 25 is the voltage controlled oscillator 3 of the primary demodulator 31.
The output signal M DC (t) from 1C is divided into 1 / n to output a clock signal M DF (t) to the switching means 27.
【0033】バンドパスフィルタ33は1次復調手段3
1の位相比較手段31Aからの出力信号DE(t)の中
域周波数帯のみ通過させた復調相関雑音成分DEN(t)
を同期制御手段26に出力する。同期制御手段26は復
調相関雑音成分DEN(t)を2値化して切換信号S
W(t)を切換手段27に出力する切換手段27は、切
換信号SW(t)によって初期同期捕捉をするためのス
ライディング相関用信号G(t)と電圧制御発振手段の
出力信号MDC(t)を1/nに分周したクロック信号M
DF(t)を切換え、その出力をクロック信号GC(t)
として拡散符号発生手段28に出力する。The bandpass filter 33 is the primary demodulation means 3
1 demodulation correlation noise component D EN (t) that has passed only the middle frequency band of the output signal D E (t) from the phase comparison means 31A
Is output to the synchronization control means 26. The synchronization control means 26 binarizes the demodulated correlation noise component D EN (t) and switches the switching signal S.
Switching means W (t) to be output to the switching means 27 27, the output signal M DC switching signal S W (t) by the initial synchronous acquisition sliding correlation signal G (t) and the voltage controlled oscillator means for the ( clock signal M obtained by dividing t) into 1 / n
DF (t) is switched and its output is clock signal G C (t)
To the spreading code generating means 28.
【0034】拡散符号発生手段28は光無線変調手段1
の拡散符号発生手段13で使用したM系列符号を用い、
クロック信号GC(t)に基づいて復調用拡散符号p
D(t)を発生し、この復調用拡散符号pD(t)を乗算
手段23に出力する。乗算手段23はダブルバランスド
ミキサ(DBM)から成り、バンドパスフィルタ22か
ら出力されるスペクトル拡散変調波SD(t)と復調用
拡散符号pD(t)との乗算をしてスペクトル拡散変調
波SD(t)を相関復調して逆拡散復調信号MD1(t)
を得る。バンドパスフィルタ29は逆拡散復調信号MD1
(t)の所定の周波数帯域のみ通過さて復調1次変調波
MD2(t)を得て、振幅制限増幅手段30に出力する。The spread code generating means 28 is the optical wireless modulation means 1
Using the M-sequence code used in the spreading code generation means 13 of
Spreading code p for demodulation based on the clock signal G C (t)
D (t) is generated and this demodulation spread code p D (t) is output to the multiplication means 23. The multiplying means 23 is composed of a double balanced mixer (DBM), and performs spread spectrum modulation by multiplying the spread spectrum modulated wave S D (t) output from the band pass filter 22 by the demodulation spread code p D (t). The wave S D (t) is subjected to correlation demodulation and the despread demodulation signal M D1 (t)
Get. The band pass filter 29 is a despread demodulation signal M D1.
The demodulated first-order modulated wave M D2 (t) is obtained by passing only the predetermined frequency band of (t), and is output to the amplitude limiting amplification means 30.
【0035】このように、光無線変復調装置の光無線変
調装置に、情報信号をスペクトル拡散変調したスペクト
ル拡散変調波を出力するスペクトル拡散変調手段と、ス
ペクトル拡散変調波に基づいた駆動信号を出力する駆動
手段と、駆動信号を光信号に変換してこの光信号を光無
線変調波として送出する発光手段と、を備え、スペクト
ル拡散変調手段は、情報信号を変調した1次変調波を出
力する情報変調手段と、1次変調波を分周してクロック
信号を出力する分周手段と、クロック信号に基づいて拡
散符号を発生してこの拡散符号を出力する拡散符号発生
手段と、1次変調波と拡散符号とを乗算したスペクトル
拡散変調波を出力する乗算手段と、を備えたので、電気
機器等からの不要輻射による妨害に強く安定した送信お
よび受信ができ、またスペクトル拡散変調波の電力密度
が小さいことから、他の電気機器に与える影響を少なく
することができる。As described above, the optical wireless modulator of the optical wireless modulator / demodulator outputs the spread spectrum modulating means for spread spectrum modulating the information signal to the spread spectrum and the drive signal based on the spread spectrum modulating wave. The spread spectrum modulating means is provided with a driving means and a light emitting means for converting the driving signal into an optical signal and transmitting the optical signal as an optical wireless modulated wave, and the spread spectrum modulating means outputs information for outputting a primary modulated wave obtained by modulating the information signal. Modulating means, frequency dividing means for dividing the primary modulated wave to output a clock signal, spreading code generating means for generating a spreading code based on the clock signal and outputting the spreading code, and primary modulated wave And a multiplying unit for outputting a spread spectrum modulated wave that is obtained by multiplying a spread code with each other, so that stable transmission and reception can be performed against interference due to unnecessary radiation from electric devices, Since the power density of a spread spectrum modulated wave is small and it is possible to reduce the influence on other electric devices.
【0036】図4は本発明に係る光無線復調装置の初期
同期捕捉の動作説明図である。図4の[A]はバンドパ
スフィルタ29の復調1次変調波MD2(t)の波形を示
したものである。相関ピーク時点SP1と相関ピーク時点
SP2の時間L1は、拡張符号長をLとすると、L1=L
/{f0−(f0±△f}となり、初期同期捕捉時間Tは
T<L1の関係がある。FIG. 4 is an explanatory diagram of the operation of initial synchronization acquisition of the optical wireless demodulation device according to the present invention. [A] of FIG. 4 shows the waveform of the demodulated primary modulated wave M D2 (t) of the bandpass filter 29. When the extended code length is L, the time L1 between the correlation peak time S P1 and the correlation peak time S P2 is L1 = L
/ {F 0 − (f 0 ± Δf), and the initial synchronization acquisition time T has a relationship of T <L1.
【0037】バンドパスフィルタ29の復調1次変調波
MD2(t)は振幅制限増幅手段30を介して1次復調手
段31供給されてMSK復調される。振幅制限増幅手段
30は復調1次変調波MD2(t)を振幅制限増幅し、そ
の出力MD(t)を1次復調手段31に出力する。1次
復調手段31は位相比較手段31A、ループフィルタ3
1B、電圧制御発振手段31CからなるPLLで構成す
る。振幅制限増幅された復調1次変調波MD(t)は位
相比較手段31Aの基準信号MD(t)として位相比較
手段31Aに入力される。電圧制御発振手段31Cの発
振出力信号は比較信号MDC(t)として位相比較手段3
1Aにフィードバックされ、位相比較手段31Aは入力
される基準信号MD(t)と比較信号MDC(t)との周
波数および位相が一致するようにループフィルタ31B
を介して電圧制御発振手段31Cに制御電圧を誤差信号
DE(t)として出力する。1次復調手段31は誤差信
号DE(t)を1次復調出力信号DE(t)としてローパ
スフィルタ32とバンドパスフィルタ33とに出力し、
ローパスフィルタ32の出力に復調情報信号DD(t)
を得る。The demodulated primary modulated wave M D2 (t) of the bandpass filter 29 is supplied to the primary demodulating means 31 via the amplitude limiting amplifying means 30 and is MSK demodulated. The amplitude limiting / amplifying means 30 amplitude-limits and amplifies the demodulated primary modulated wave M D2 (t), and outputs the output M D (t) to the primary demodulating means 31. The primary demodulation means 31 is a phase comparison means 31A, a loop filter 3
1B, a PLL including a voltage controlled oscillator 31C. The demodulated primary modulated wave M D (t) that has been amplitude-limited and amplified is input to the phase comparison unit 31A as the reference signal M D (t) of the phase comparison unit 31A. The oscillation output signal of the voltage controlled oscillator 31C is used as the comparison signal M DC (t) in the phase comparator 3
The reference signal M D (t) and the comparison signal M DC (t) that are fed back to the phase comparison unit 31A are fed back to the loop filter 31B so that the frequency and the phase of the reference signal M D (t) match.
The control voltage is output as an error signal D E (t) to the voltage controlled oscillator 31C via the. The primary demodulation means 31 outputs the error signal D E (t) as a primary demodulation output signal D E (t) to the low pass filter 32 and the band pass filter 33,
The output of the low-pass filter 32 is the demodulation information signal D D (t)
Get.
【0038】図4の[B]はバンドパスフィルタ33の
復調相関雑音成分DEN(t)の波形を示したものであ
る。同期制御手段26は復調相関雑音成分DEN(t)を
2値化して切換信号SW(t)を生成し、図4の[A]
に示した相関ピーク時点SP1および相関ピーク時点SP2
に対応する時刻において復調相関雑音成分DEN(t)の
レベルが極小となり、この極小時点を検出して切換手段
27を切換える。[B] of FIG. 4 shows the waveform of the demodulation correlation noise component D EN (t) of the bandpass filter 33. The synchronization control means 26 binarizes the demodulated correlated noise component D EN (t) to generate the switching signal S W (t), and [A] in FIG.
Correlation peak time S P1 and correlation peak time S P2 shown in
The level of the demodulated correlation noise component D EN (t) becomes a minimum at the time corresponding to, and the switching means 27 is switched by detecting this minimum time.
【0039】図4の[C]と[D]は切換手段27の切
換えタイミングを示したものである。切換手段27では
スライディング相関用信号G(t)からクロック信号M
DF(t)に切換動作が行われると、切換動作はそのまま
継続する。[C] and [D] of FIG. 4 show the switching timing of the switching means 27. The switching means 27 converts the sliding correlation signal G (t) to the clock signal M.
When the switching operation is performed on DF (t), the switching operation continues.
【0040】MSK復調を行う1次復調手段31の電圧
制御発振手段31Cの発振出力信号MDC(t)は周波数
f0で復調1次変調波MD(t)に同期しており、この周
波数f0は光無線変調装置1の1次変調波M(t)の周
波数に一致している。従って、分周手段25、切換手段
27を介して拡散符号発生手段28に供給されるクロッ
ク信号GC(t)も光無線変調装置1の拡散符号発生手
段13に供給されるクロック信号MF(t)と等しい。
尚、分周手段25の分周数は光無線変調装置1の分周手
段12の分周数と等しい。The oscillation output signal M DC (t) of the voltage controlled oscillator 31C of the primary demodulator 31 for MSK demodulation is synchronized with the demodulated primary modulated wave M D (t) at the frequency f 0 , and this frequency f 0 matches the frequency of the primary modulated wave M (t) of the optical wireless modulator 1. Therefore, the clock signal G C (t) supplied to the spread code generating means 28 via the frequency dividing means 25 and the switching means 27 is also the clock signal M F (supplied to the spread code generating means 13 of the optical wireless modulator 1. equal to t).
The frequency division number of the frequency division means 25 is equal to the frequency division number of the frequency division means 12 of the optical wireless modulator 1.
【0041】クロック信号GC(t)は拡散符号発生手
段28に供給され、初期同期捕捉から同期保持動作へと
移行して初期同期捕捉が終了し、その後は正常なMSK
復調が持続してロ−パスフィルタ32を介して復調情報
信号DD(t)が出力端子に出力される。The clock signal G C (t) is supplied to the spread code generating means 28, the initial synchronization acquisition is shifted to the synchronization holding operation, the initial synchronization acquisition is completed, and thereafter the normal MSK is performed.
The demodulation continues and the demodulation information signal D D (t) is output to the output terminal through the low pass filter 32.
【0042】このように、光無線変復調装置の光無線復
調装置に、光無線変調波を受光して電気信号に変換する
受光手段と、受光手段の出力をバンドパスフィルタを介
して得られるスペクトル拡散変調波を復調用拡散符号を
用いて乗算により逆拡散復調して逆拡散復調信号を出力
する逆拡散復調手段と、逆拡散復調信号をバンドパスフ
ィルタと、増幅手段と、を介して得られる1次変調波を
1次復調して情報信号を出力する、位相比較手段、ルー
プフィルタ、電圧制御発振手段からなる1次復調手段
と、を備え、また逆拡散復調手段に、スライディング相
関用信号を発生して出力するスライディング相関用発振
手段と、1次変調波を分周してクロック信号を出力する
分周手段と、位相比較手段の出力信号を2値化して切換
信号を出力する同期制御手段と、切換信号に基づいてス
ライディング相関用信号とクロック信号を切換える切換
手段と、クロック信号に基づいて復調用拡散信号を出力
する拡散用符号発生手段と、スペクトル拡散変調波と復
調用拡散信号との乗算をして逆拡散復調信号を出力する
乗算手段と、を備えたので、電気機器等からの不要輻射
による妨害に強く安定した送信および受信ができ、また
スペクトル拡散変調波の電力密度が小さいことから、他
の電気機器に与える影響を少なくすることができる。As described above, in the optical wireless demodulation device of the optical wireless modulation / demodulation device, the light receiving means for receiving the optical wireless modulated wave and converting it into an electric signal, and the spread spectrum obtained by the output of the light receiving means through the band pass filter. 1 obtained by despreading demodulation means for despreading demodulating a modulated wave by multiplication with a spreading code for demodulation and outputting a despread demodulation signal; and a despread demodulation signal through a bandpass filter and an amplification means. A primary demodulation means including a phase comparison means, a loop filter, and a voltage controlled oscillation means for primary demodulating the secondary modulated wave and outputting an information signal, and generating a sliding correlation signal in the despread demodulation means. Oscillating means for sliding correlation, which is output in the form of frequency, frequency dividing means for dividing the primary modulated wave to output a clock signal, and synchronization for binarizing the output signal of the phase comparing means and outputting a switching signal. Control means, switching means for switching between the sliding correlation signal and the clock signal based on the switching signal, spreading code generating means for outputting the demodulation spreading signal based on the clock signal, spread spectrum modulated wave and demodulation spreading signal And a multiplication means for outputting a despread demodulated signal by multiplying with, so that stable transmission and reception are possible against interference due to unnecessary radiation from electrical equipment, and the power density of the spread spectrum modulated wave Since it is small, the influence on other electric devices can be reduced.
【0043】図5は本発明に係る光無線変復調装置の符
号分割多重方式の模式説明図である。図6は本発明に係
る光無線変復調装置の符号分割多重方式の原理説明図で
ある。図5において、送信端末(A)は情報信号aを拡
散符号p1(t)でスペクトル拡散変調し、さらにスペ
クトル拡散変調波に基づいて発光手段で光強度変調した
光無線変調波a1を送出する。送信端末(B)は情報信
号bを拡散符号p2(t)でスペクトル拡散変調し、さ
らにスペクトル拡散変調波に基づいて発光手段で光強度
変調した光無線変調波b1を送出する。送信端末(C)
は情報信号cを拡散符号p3(t)でスペクトル拡散変
調し、さらにスペクトル拡散変調波に基づいて発光手段
で光強度変調した光無線変調波c1を送出する。FIG. 5 is a schematic explanatory view of the code division multiplexing system of the optical wireless modulator / demodulator according to the present invention. FIG. 6 is an explanatory view of the principle of the code division multiplexing system of the optical wireless modulator / demodulator according to the present invention. In FIG. 5, a transmitting terminal (A) spread-spectrum-modulates an information signal a with a spread code p 1 (t), and further transmits an optical wireless modulated wave a1 whose light intensity is modulated by a light emitting means based on the spread-spectrum modulated wave. . The transmitting terminal (B) spread-spectrum-modulates the information signal b with the spread code p 2 (t), and further transmits the optical wireless modulated wave b1 whose light intensity is modulated by the light emitting means based on the spread-spectrum modulated wave. Sending terminal (C)
Performs spread spectrum modulation of the information signal c with a spread code p 3 (t), and further transmits an optical wireless modulated wave c1 whose light intensity is modulated by the light emitting means based on the spread spectrum modulated wave.
【0044】それぞれの送信端末から放出された光無線
変調波が空間合成され、各復調端末の受光手段では空間
合成波が受光される。復調端末(D)は受光した空間合
成波を復調用拡散符号p1(t)で相関復調するので情
報信号aを得る。復調端末(E)は受光した空間合成波
を復調用拡散符号p2(t)で相関復調するので情報信
号bを得る。復調端末(F)は受光した空間合成波を復
調用拡散符号p3(t)で相関復調するので情報信号c
を得る。The optical wireless modulated waves emitted from the respective transmitting terminals are spatially combined, and the spatially combined waves are received by the light receiving means of each demodulating terminal. The demodulation terminal (D) correlatively demodulates the received spatially synthesized wave with the demodulation spreading code p 1 (t), and thus obtains the information signal a. The demodulation terminal (E) correlatively demodulates the received spatially synthesized wave with the demodulation spreading code p 2 (t), and thus obtains the information signal b. Since the demodulation terminal (F) performs correlation demodulation on the received spatially synthesized wave with the demodulation spreading code p 3 (t), the information signal c
Get.
【0045】図6の[A]は送信端末(A)における情
報信号aによる搬送周波数f0の搬送波の1次変調であ
るMSK変調波を示したものである。[B]は各送信端
末から送信されたスペクトル拡散変調波の空間合成波
(a1+b1+c1)を示したものである。[C]は復
調端末(D)で受光した空間合成波を復調用拡散符号p
1(t)で相関復調した復調1次変調波を示したもので
ある。[D]は復調端末(D)で相関復調した復調1次
変調波をフィルタ処理した情報信号aのMSK変調波と
妨害波b3、妨害波c3を示したものである。[A] of FIG. 6 shows an MSK modulated wave which is the primary modulation of the carrier of the carrier frequency f 0 by the information signal a in the transmitting terminal (A). [B] shows the spatially synthesized wave (a1 + b1 + c1) of the spread spectrum modulated wave transmitted from each transmitting terminal. [C] is a spread code p for demodulating the spatially synthesized wave received by the demodulation terminal (D).
1 shows a demodulated first-order modulated wave subjected to correlation demodulation at 1 (t). [D] shows the MSK modulated wave, the disturbing wave b3, and the disturbing wave c3 of the information signal a obtained by filtering the demodulated primary modulated wave subjected to the correlation demodulation at the demodulating terminal (D).
【0046】このように、光無線変復調装置に固有の拡
散符号を有するので、LEDの高効率駆動下において不
可能であった複数の光無線変復調装置を限られた空間範
囲内で符号分割多重として同時刻、同周波数帯で使用す
ることができる。As described above, since the optical wireless modulator / demodulator has a spreading code unique to the optical wireless modulator / demodulator, a plurality of optical wireless modulator / demodulators, which were not possible under high efficiency driving of LEDs, are code-division multiplexed within a limited space range. It can be used at the same time and in the same frequency band.
【0047】図7は本発明に係る光無線変復調装置の光
空間多重方式の原理説明図である。図7において、複数
の光無線変復調端末が限られた空間内に存在する場合、
光無線変調端末(送信端末)から送出する光無線変調波
に指向性を与えて複数の光無線変復調端末間での干渉を
極力生じないようにして多重使用できるようにした光空
間多重方式の原理を示したものである。FIG. 7 is a diagram for explaining the principle of the optical space multiplexing system of the optical wireless modulator / demodulator according to the present invention. In FIG. 7, when a plurality of optical wireless modem terminals exist in a limited space,
The principle of the optical space multiplexing method, in which directivity is given to the optical wireless modulation wave transmitted from the optical wireless modulation terminal (transmission terminal) so that multiple optical wireless modulation / demodulation terminals can be multiplexed without causing interference as much as possible. Is shown.
【0048】送信端末(A)から送出する光無線変調波
は復調端末(D)に指向性を与え、同様に送信端末
(B)は復調端末(E)に、送信端末(C)は復調端末
(F)西構成を与えている。The optical wireless modulated wave transmitted from the transmitting terminal (A) gives directivity to the demodulating terminal (D), and similarly, the transmitting terminal (B) is to the demodulating terminal (E) and the transmitting terminal (C) is to the demodulating terminal. (F) West configuration is given.
【0049】このように、光無線変復調装置に光無線変
調装置に指向性を有する光無線用発光手段を備えたの
で、符号分割多重と光空間分割多重を併せ持つ多重方式
ができ、限られた空間内でより多くの光無線変復調装置
を使用することができる。また、個別の端末が携帯端末
のように移動するような場合には各光無線変調装置の指
向性を調整する必要があり、理想状態を確保することは
困難であったが、光空間多重方式と請求項1記載の符号
分割多重方式を併用することによって送受信の信頼性を
高めることができ、さらに多重数も飛躍的に向上でき
る。As described above, since the optical wireless modulator / demodulator is provided with the optical wireless light emitting means having directivity in the optical wireless modulator, a multiplexing system having both code division multiplexing and optical space division multiplexing can be performed, and a limited space is available. More optical wireless modems can be used within. Further, when an individual terminal moves like a mobile terminal, it is necessary to adjust the directivity of each optical wireless modulator, which makes it difficult to maintain an ideal state. And the code division multiplexing method according to the first aspect, the reliability of transmission and reception can be improved, and the number of multiplexed signals can be dramatically improved.
【0050】なお、上記実施形態は本発明の一実施例で
あり、本発明は上記実施形態に限定されるものではな
い。The above embodiment is an example of the present invention, and the present invention is not limited to the above embodiment.
【0051】[0051]
【発明の効果】以上説明したように、請求項1に係る光
無線変復調装置は、光無線変復調装置に、それぞれ異な
る拡散符号を有し、符号分割多重機能を有し、LEDの
高効率駆動下において不可能であった複数の光無線変復
調装置を限られた空間範囲内で符号分割多重として同時
刻、同周波数帯で使用することができ、また低電力密度
で通信ができので、秘話性、秘匿性に優れ、複数のチャ
ンネルの確保が容易となり、しかも妨害排除能力が高
く、安定した受信復調ができる光無線変復調装置を提供
することができる。As described above, in the optical wireless modulator / demodulator according to the first aspect of the present invention, the optical wireless modulator / demodulator has different spreading codes, has a code division multiplexing function, and is capable of driving LEDs with high efficiency. Since it is possible to use multiple optical wireless modulators / demodulators in the limited space range at the same time and in the same frequency band as code division multiplexing, and because communication can be performed at low power density, confidentiality, It is possible to provide an optical wireless modulation / demodulation device that has excellent confidentiality, facilitates securing a plurality of channels, has a high interference rejection capability, and can perform stable reception and demodulation.
【0052】請求項2に係る光無線変復調装置は、複数
の光無線変調装置に指向性を有する光無線用発光手段を
備え、符号分割多重と光空間分割多重を併せ持つ多重方
式ができ、限られた空間内でより多くの光無線変復調装
置を使用することができるので、経済的で、多重数が大
きく、送受信の信頼性の高い、しかも操作性のよい光無
線変復調装置を提供することができる。An optical wireless modulator / demodulator according to a second aspect of the present invention is provided with a plurality of optical wireless modulators provided with optical wireless light emitting means having directivity, and is capable of a multiplexing system having both code division multiplexing and optical space division multiplexing. Since a larger number of optical wireless modulator / demodulators can be used in a space, it is possible to provide an optical wireless modulator / demodulator that is economical, has a large number of multiplexes, is highly reliable in transmission / reception, and has good operability. .
【0053】請求項3に係る光無線変調装置は、情報信
号をスペクトル拡散変調したスペクトル拡散変調波を出
力するスペクトル拡散変調手段と、スペクトル拡散変調
波に基づいた駆動信号を出力する駆動手段と、駆動信号
を光信号に変換してこの光信号を光無線変調波として送
出する発光手段と、を備え、またスペクトル拡散変調手
段は、情報信号を変調した1次変調波を出力する情報変
調手段と、1次変調波を分周してクロック信号を出力す
る分周手段と、クロック信号に基づいて拡散符号を発生
してこの拡散符号を出力する拡散符号発生手段と、1次
変調波と拡散符号とを乗算したスペクトル拡散変調波を
出力する乗算手段と、を備え、電気機器等からの不要輻
射による妨害に強く安定した送信ができ、またスペクト
ル拡散変調波の電力密度が小さいことから、他の電気機
器に与える影響を少なくすることができ、また低電力密
度で通信ができるので、秘話性、秘匿性に優れ、しかも
妨害排除能力の高い光無線変復調装置を提供することが
できる。An optical wireless modulator according to a third aspect of the present invention comprises a spread spectrum modulating means for outputting a spread spectrum modulated wave obtained by spread spectrum modulating an information signal, and a driving means for outputting a drive signal based on the spread spectrum modulated wave. A light emitting means for converting the drive signal into an optical signal and transmitting the optical signal as an optical wireless modulated wave; and the spread spectrum modulating means for outputting an information modulating means for outputting a primary modulated wave. Frequency dividing means for dividing the primary modulated wave to output a clock signal, spreading code generating means for generating a spreading code based on the clock signal and outputting the spreading code, primary modulated wave and spreading code And a multiplying means for outputting a spread spectrum modulated wave multiplied by, and capable of stable and stable transmission against interference due to unnecessary radiation from electric equipment and the like. Since the density is low, the influence on other electric devices can be reduced, and since communication can be performed at low power density, an optical wireless modulator / demodulator with excellent confidentiality and concealment and high interference rejection capability is provided. can do.
【0054】請求項4に係る光無線復調装置は、光無線
変調波を受光して電気信号に変換する受光手段と、受光
手段の出力をバンドパスフィルタを介して得られるスペ
クトル拡散変調波を復調用拡散符号を用いて乗算により
逆拡散復調して逆拡散復調信号を出力する逆拡散復調手
段と、逆拡散復調信号をバンドパスフィルタと、増幅手
段と、を介して得られる1次変調波を1次復調して情報
信号を出力する、位相比較手段、ループフィルタ、電圧
制御発振手段からなる1次復調手段と、を備え、また逆
拡散復調手段に、スライディング相関用信号を発生して
出力するスライディング相関用発振手段と、1次変調波
を分周してクロック信号を出力する分周手段と、位相比
較手段の出力信号を2値化して切換信号を出力する同期
制御手段と、切換信号に基づいてスライディング相関用
信号とクロック信号を切換える切換手段と、クロック信
号に基づいて復調用拡散信号を出力する拡散用符号発生
手段と、スペクトル拡散変調波と復調用拡散信号との乗
算をして逆拡散復調信号を出力する乗算手段と、を備
え、電気機器等からの不要輻射による妨害に強く安定し
た受信ができるので、秘話性、秘匿性に優れ、しかも妨
害排除能力の高い光無線変復調装置を提供することがで
きる。An optical wireless demodulation device according to a fourth aspect of the present invention demodulates a light receiving means for receiving the optical wireless modulated wave and converting it into an electric signal, and a spread spectrum modulated wave obtained by passing the output of the light receiving means through a bandpass filter. Despread demodulation means for performing despread demodulation by multiplication using the spreading code for use to output a despread demodulation signal, a despread demodulation signal for a primary modulated wave obtained through a bandpass filter, and an amplification means. And a primary demodulation unit including a phase comparison unit, a loop filter, and a voltage controlled oscillation unit for performing primary demodulation and outputting an information signal, and a sliding correlation signal is generated and output to the despreading demodulation unit. Oscillation means for sliding correlation, frequency division means for dividing the primary modulated wave to output a clock signal, synchronization control means for binarizing the output signal of the phase comparison means and outputting a switching signal, and switching Switching means for switching between the sliding correlation signal and the clock signal based on the signal, the spreading code generating means for outputting the demodulation spreading signal based on the clock signal, and the multiplication of the spread spectrum modulated wave and the demodulation spreading signal. , Which outputs a despread demodulation signal, and is capable of strong and stable reception against interference due to unwanted radiation from electrical equipment, etc. A device can be provided.
【0055】請求項5に係る光無線変調装置は、乗算手
段に入力される1次変調波と拡散符号発生手段に入力さ
れるクロック信号とが同期した同期型拡散変調とし、簡
単な構成で、簡潔な回路動作により光無線変調装置の実
用化ができるので、経済的で、小型で、操作性のよい光
無線変復調装置を提供することができる。An optical wireless modulator according to a fifth aspect of the present invention uses synchronous spread modulation in which the primary modulated wave input to the multiplication means and the clock signal input to the spread code generation means are synchronized, and has a simple structure. Since the optical wireless modulator can be put into practical use by a simple circuit operation, it is possible to provide an optical wireless modulator / demodulator which is economical, small-sized, and easy to operate.
【0056】請求項6に係る光無線復調装置は、乗算手
段に入力されるスペクトル拡散変調波と拡散符号発生手
段に入力されるクロック信号とが同期した同期型逆拡散
復調とし、簡単な構成で、簡潔な回路動作により光無線
復調装置の実用化ができるので、経済的で、小型で、操
作性のよい光無線変復調装置を提供することができる。An optical wireless demodulation device according to a sixth aspect of the invention is a synchronous despread demodulation in which a spread spectrum modulated wave input to a multiplication means and a clock signal input to a spread code generation means are synchronized, and has a simple structure. Since the optical wireless demodulation device can be put to practical use with a simple circuit operation, it is possible to provide an optical wireless modulation / demodulation device that is economical, small-sized, and has good operability.
【図1】本発明に係る光無線変調装置の要部ブロック構
成図FIG. 1 is a block diagram of a main part of an optical wireless modulator according to the present invention.
【図2】本発明に係る光無線変調装置の1次変調波M
(t)、スペクトル拡散変調波SM(t)の周波数スペ
クトル図FIG. 2 is a first-order modulated wave M of the optical wireless modulator according to the present invention.
(T), frequency spectrum diagram of spread spectrum modulated wave SM (t)
【図3】本発明に係る光無線復調装置の要部ブロック構
成図FIG. 3 is a block diagram of a main part of an optical wireless demodulation device according to the present invention.
【図4】本発明に係る光無線復調装置の初期同期捕捉の
動作説明図FIG. 4 is an operation explanatory diagram of initial synchronization acquisition of the optical wireless demodulation device according to the present invention.
【図5】本発明に係る光無線変復調装置の符号分割多重
方式の模式説明図FIG. 5 is a schematic explanatory diagram of a code division multiplexing system of an optical wireless modulator / demodulator according to the present invention.
【図6】本発明に係る光無線変復調装置の符号分割多重
方式の原理説明図FIG. 6 is an explanatory view of the principle of the code division multiplexing system of the optical wireless modulator / demodulator according to the present invention.
【図7】本発明に係る光無線変復調装置の光空間多重方
式の原理説明図FIG. 7 is an explanatory diagram of the principle of the optical space multiplexing method of the optical wireless modulator / demodulator according to the present invention.
【図8】光リモコン装置(光リモートコントロール装
置)の光無線変調装置の要部ブロック構成図FIG. 8 is a block diagram of a main part of an optical wireless modulator of an optical remote controller (optical remote controller).
【図9】光リモコン装置(光リモートコントロール装
置)の光無線復調装置の要部ブロック構成図FIG. 9 is a block diagram of a main part of an optical wireless demodulation device of an optical remote control device (optical remote control device).
【図10】オフィスや一般家庭に使用されている高周波
蛍光灯の不要輻射特性FIG. 10: Unwanted radiation characteristics of high-frequency fluorescent lamps used in offices and homes
【図11】光無線変調装置の光無線変調波の周波数スペ
クトル特性FIG. 11 is a frequency spectrum characteristic of an optical wireless modulated wave of the optical wireless modulator.
1…光無線変調装置、2…光無線復調装置、10…スペ
クトル拡散変調手段、11…情報変調手段、12,25
…分周手段、13…拡散符号発生手段、14…乗算手
段、15…駆動手段、16…発光手段、20…受光手
段、21…逆拡散復調手段、22,29,33…バンド
パスフィルタ、23…乗算手段、24…スライディング
相関用発振手段、26…同期制御手段、27…切換手
段、28…拡散用符号発生手段、30…振幅制限増幅手
段、31…1次復調手段、31A…位相比較手段、31
B…ループフィルタ、31C…電圧制御発振手段、32
…ローパスフィルタ、D(t)…情報信号、DBM…ダ
ブルバランスドミキサ、DE(t)…誤差信号、D
EN(t)…復調相関雑音成分、f0…搬送波周波数、G
(t)…スライディング相関用信号、GC(t)…クロ
ック信号、M(t)…1次変調波、MD1(t)…復調1
次変調波、MDC(t)…発振出力信号、MDF(t)…ク
ロック信号、MF(t)…クロック信号、p(t)…拡
散符号、pD(t)…拡散符号、SC(t)…光無線変調
波、SD(t),SD1(t),SM(t)…スペクトル拡
散変調波、SM1(t)…駆動信号、SW(t)…切換信
号。1 ... Optical wireless modulation device, 2 ... Optical wireless demodulation device, 10 ... Spread spectrum modulation means, 11 ... Information modulation means, 12, 25
... frequency dividing means, 13 ... spreading code generating means, 14 ... multiplying means, 15 ... driving means, 16 ... light emitting means, 20 ... light receiving means, 21 ... despreading demodulating means, 22, 29, 33 ... bandpass filter, 23 ... multiplication means, 24 ... sliding correlation oscillation means, 26 ... synchronization control means, 27 ... switching means, 28 ... spreading code generation means, 30 ... amplitude limiting amplification means, 31 ... primary demodulation means, 31A ... phase comparison means , 31
B ... Loop filter, 31C ... Voltage controlled oscillation means, 32
... low-pass filter, D (t) ... information signal, DBM ... double balanced mixer, D E (t) ... error signal, D
EN (t) ... Demodulation correlation noise component, f 0 ... Carrier frequency, G
(T) ... Sliding correlation signal, G C (t) ... Clock signal, M (t) ... Primary modulated wave, M D1 (t) ... Demodulation 1
Order modulation wave, M DC (t) ... oscillation output signal, M DF (t) ... a clock signal, M F (t) ... a clock signal, p (t) ... spreading code, p D (t) ... spreading codes, S C (t) ... light modulated radio wave, S D (t), S D1 (t), S M (t) ... spread spectrum modulated wave, S M1 (t) ... drive signal, S W (t) ... switching signal .
Claims (6)
ル拡散変調してスペクトル拡散変調波を出力するスペク
トル拡散変調手段と、前記スペクトル拡散変調波に基づ
いた駆動信号を出力する駆動手段と、前記駆動信号を光
信号に変換して光無線変調波を送出する発光手段と、を
備え、 光無線復調装置は、光無線変調波を受光して電気信号に
変換する受光手段と、前記受光手段の出力信号を逆拡散
復調して逆拡散復調信号を出力する逆拡散復調手段と、
前記逆拡散復調信号を復調して情報信号を出力する復調
手段と、を備え、 前記光無線変調装置と、前記光無線復調装置と、からな
る光無線変復調装置であって、複数の前記光無線変復調
装置からなるシステムにおいて、 複数の前記光無線変復調装置は、それぞれ異なる拡散符
号を有し、符号分割多重機能を有することを特徴とする
光無線変復調装置。1. An optical wireless modulator, wherein the spread spectrum modulating means outputs a spread spectrum modulated wave by spread spectrum modulating an information signal, a driving means outputting a drive signal based on the spread spectrum modulated wave, and The optical wireless demodulation device includes a light receiving means for receiving the optical wireless modulated wave and converting the optical wireless modulated wave into an electric signal, and a light emitting means for converting the drive signal into an optical signal. Despreading demodulation means for despreading demodulating the output signal to output a despreading demodulated signal,
A demodulation unit that demodulates the despread demodulation signal and outputs an information signal. An optical wireless modulation and demodulation device including the optical wireless modulation device and the optical wireless demodulation device, wherein a plurality of the optical wireless devices are provided. In a system including a modulator / demodulator, the plurality of optical wireless modulators / demodulators each have a different spreading code and have a code division multiplexing function.
ステムにおいて、 複数の前記光無線変調装置は、指向性を有する光無線用
発光手段を備えたことを特徴とする請求項1記載の光無
線変復調装置。2. The optical wireless system according to claim 1, wherein, in the system including a plurality of the optical wireless modulation / demodulation devices, the plurality of the optical wireless modulation devices include optical wireless light emitting means having directivity. Modulator / demodulator.
ル拡散変調してスペクトル拡散変調波を出力するスペク
トル拡散変調手段と、前記スペクトル拡散変調波に基づ
いた駆動信号を出力する駆動手段と、前記駆動信号を光
信号に変換して光無線変調波を送出する発光手段と、か
ら構成し、 前記スペクトル拡散変調手段は、情報信号を変調して1
次変調波を出力する情報変調手段と、前記1次変調波を
分周してクロック信号を出力する分周手段と、前記クロ
ック信号に基づいて拡散符号を発生して出力する拡散符
号発生手段と、前記1次変調波と前記拡散符号とを乗算
して前記スペクトル拡散変調波を出力する乗算手段と、
を備えたことを特徴とする光無線変調装置。3. An optical wireless modulator, wherein the spread spectrum modulating means spread spectrum modulates an information signal to output a spread spectrum modulated wave, a driving means outputting a drive signal based on the spread spectrum modulated wave, and And a light emitting means for converting the drive signal into an optical signal and transmitting an optical wireless modulated wave, wherein the spread spectrum modulating means modulates the information signal to
Information modulating means for outputting a next modulated wave, frequency dividing means for dividing the primary modulated wave to output a clock signal, and spread code generating means for generating and outputting a spread code based on the clock signal. Multiplication means for multiplying the primary modulated wave and the spread code to output the spread spectrum modulated wave,
An optical wireless modulator, comprising:
して電気信号に変換する受光手段と、前記受光手段の出
力信号を復調用拡散符号を用いて逆拡散復調して逆拡散
復調信号を出力する逆拡散復調手段と、前記逆拡散復調
信号を1次復調して情報信号を出力する、位相比較手
段、ループフィルタ、電圧制御発振手段からなる1次復
調手段と、を備え、 前記逆拡散復調手段は、スライディング相関用信号を発
生して出力するスライディング相関用発振手段と、前記
1次変調波を分周してクロック信号を出力する分周手段
と、前記位相比較手段の出力信号を2値化して切換信号
を出力する同期制御手段と、前記切換信号に基づいて前
記スライディング相関用信号と前記クロック信号を切換
える切換手段と、前記クロック信号に基づいて前記復調
用拡散信号を出力する拡散用符号発生手段と、前記スペ
クトル拡散変調波と前記復調用拡散信号との乗算をして
逆拡散復調信号を出力する乗算手段と、を備えたことを
特徴とする光無線復調装置。4. An optical wireless demodulation device, a light receiving means for receiving an optical wireless modulated wave and converting it into an electric signal, and an output signal of the light receiving means is despread demodulated by using a demodulating spreading code to perform despread demodulation. Despreading demodulation means for outputting a signal, and primary demodulation means for primary demodulating the despread demodulation signal and outputting an information signal, the primary demodulation means comprising a phase comparison means, a loop filter, and a voltage controlled oscillation means, The despreading demodulation means includes a sliding correlation oscillating means for generating and outputting a sliding correlation signal, a frequency dividing means for dividing the primary modulated wave and outputting a clock signal, and an output signal of the phase comparing means. Synchronization control means for binarizing and outputting a switching signal, switching means for switching the sliding correlation signal and the clock signal based on the switching signal, and the demodulation based on the clock signal. An optical wireless system comprising: spreading code generating means for outputting a spread signal; and multiplying means for multiplying the spread spectrum modulated wave by the demodulating spread signal to output a despread demodulated signal. Demodulator.
入力される1次変調波と前記拡散符号発生手段に入力さ
れるクロック信号とが同期した同期型拡散変調であるこ
とを特徴とする請求項1、または請求項2、または請求
項3記載の光無線変調装置。5. The optical wireless modulation device is a synchronous spread modulation in which a primary modulated wave input to the multiplication means and a clock signal input to the spread code generation means are synchronized. An optical wireless modulator according to claim 1, 2, or 3.
入力されるスペクトル拡散変調波と前記拡散符号発生手
段に入力されるクロック信号とが同期した同期型逆拡散
復調であることを特徴とする請求項1、または請求項
2、または請求項4記載の光無線復調装置。6. The optical wireless demodulation device is a synchronous despread demodulation in which a spread spectrum modulated wave input to the multiplication means and a clock signal input to the spread code generation means are synchronized. 5. The optical wireless demodulation device according to claim 1, 2, or 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7336802A JPH09181646A (en) | 1995-12-25 | 1995-12-25 | Optical radio modulator, optical radio demodulator and optical radio modem |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7336802A JPH09181646A (en) | 1995-12-25 | 1995-12-25 | Optical radio modulator, optical radio demodulator and optical radio modem |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09181646A true JPH09181646A (en) | 1997-07-11 |
Family
ID=18302828
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7336802A Pending JPH09181646A (en) | 1995-12-25 | 1995-12-25 | Optical radio modulator, optical radio demodulator and optical radio modem |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09181646A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007124405A (en) * | 2005-10-28 | 2007-05-17 | Kyocera Corp | Light communication apparatus, light communication system, and light communication method |
JP2018133689A (en) * | 2017-02-15 | 2018-08-23 | 三菱電機株式会社 | Visible light communication system and visible light communication method |
CN109004980A (en) * | 2018-08-01 | 2018-12-14 | 深圳清华大学研究院 | Visible light communication mixing light-dimming method and device based on generalized space modulation |
-
1995
- 1995-12-25 JP JP7336802A patent/JPH09181646A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007124405A (en) * | 2005-10-28 | 2007-05-17 | Kyocera Corp | Light communication apparatus, light communication system, and light communication method |
JP4652211B2 (en) * | 2005-10-28 | 2011-03-16 | 京セラ株式会社 | Optical communication apparatus, optical communication system, and optical communication method |
JP2018133689A (en) * | 2017-02-15 | 2018-08-23 | 三菱電機株式会社 | Visible light communication system and visible light communication method |
CN109004980A (en) * | 2018-08-01 | 2018-12-14 | 深圳清华大学研究院 | Visible light communication mixing light-dimming method and device based on generalized space modulation |
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