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1. WO2007097319 - QUADRATURE DEMODULATOR AND INTERROGATOR

Publication Number WO/2007/097319
Publication Date 30.08.2007
International Application No. PCT/JP2007/053070
International Filing Date 20.02.2007
Chapter 2 Demand Filed 20.09.2007
IPC
H04L 27/22 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
18Phase-modulated carrier systems, i.e. using phase-shift keying
22Demodulator circuits; Receiver circuits
H04B 1/30 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
06Receivers
16Circuits
30for homodyne or synchrodyne receivers
H04B 1/59 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
59Responders; Transponders
H04B 5/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
5Near-field transmission systems, e.g. inductive loop type
02using transceiver
G06K 17/00 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
17Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/-G06K15/168
H03D 1/00 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
1Demodulation of amplitude-modulated oscillations
CPC
H03D 3/008
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
3Demodulation of angle-, ; frequency- or phase-; modulated oscillations
007by converting the oscillations into two quadrature related signals
008Compensating DC offsets
H04B 1/525
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
40Circuits
50using different frequencies for the two directions of communication
52Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
525with means for reducing leakage of transmitter signal into the receiver
Applicants
  • 東芝テック株式会社 Toshiba Tec Kabushiki Kaisha [JP]/[JP] (AllExceptUS)
  • 室伏 信男 MUROFUSHI, Nobuo [JP]/[JP] (UsOnly)
  • 大石 禎利 OISHI, Sadatoshi [JP]/[JP] (UsOnly)
Inventors
  • 室伏 信男 MUROFUSHI, Nobuo
  • 大石 禎利 OISHI, Sadatoshi
Agents
  • 鈴江 武彦 SUZUYE, Takehiko
Priority Data
2006-04876724.02.2006JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) QUADRATURE DEMODULATOR AND INTERROGATOR
(FR) DEMODULATEUR DE QUADRATURE ET INTERROGATEUR
(JA) 直交復調器及び質問器
Abstract
(EN)
A quadrature demodulator for suppressing noise affections as much as possible even when the level of a received signal becomes small, thereby reducing the occurrences of erroneous reproduction of the received data. In the quadrature demodulator, an I-signal and a Q-signal are generated from a modulated received signal, a local signal and from a local signal having been phase-shifted by 90 degrees, and then the DC components of the I-signal and Q-signal are removed by capacitors (37,38). In addition, the frequency components higher than the frequencies of the I-signal and Q-signal are removed by lowpass filters (35,36). The I-signal having passed through the lowpass filter is squared by an I-signal squaring part (43), while the Q-signal having passed through the lowpass filter is squared by a Q-signal squaring part (44). The squared I-signal and Q-signal are then added together by an adding part (45). A comparator (18) then compares the level of a resultant added signal (S1) with a threshold value (T1), thereby providing a signal (S2). A data generating part (48) of a digital signal processing part (12) inverts the signal level in response to each rising edge of the signal (S2), thereby demodulating the received data.
(FR)
La présente invention concerne un démodulateur à quadrature pour supprimer autant que possible des interférences de bruit lorsque le niveau d'un signal reçu devient faible, ce qui réduit donc les occurrences de reproduction erronée des données reçues. Dans le démodulateur à quadrature, un signal I et un signal Q sont générés à partir d'un signal modulé reçu, un signal local et à partir d'un signal local ayant été déphasé par 90 degrés, puis les composants DC du signal I et du signal Q sont retirés par les condensateurs (37, 38). En outre, les composants de fréquence supérieurs aux fréquences du signal I et du signal Q sont éliminés par des filtres passe-bas (35, 36). Le signal I qui a passé à travers le filtre passe-bas est élevé au carré par une portion d'élévation au carré du signal I (43), tandis que le signal Q qui a passé par le filtre passe-bas est élevé au carré par une portion d'élévation au carré de signal Q (44). Les signaux I et Q élevés au carré sont ensuite ajoutés ensemble par une portion d'ajout (45). Un comparateur (18) compare ensuite le niveau d'un signal ajouté résultant (S1) à une valeur de seuil (T1), ce qui fournit un signal (S2). Une portion de génération de données (48) de portion de traitement de signal numérique (12) inverse le niveau de signal en réponse à chaque flanc montant du signal (S2)
(JA)
 直交復調器は、受信信号のレベルが小さくなってもノイズの影響を極力防止して受信データの誤再生の発生を低減するためのものであり、変調された受信信号とローカル信号及び90度位相をシフトしたローカル信号からI信号とQ信号を生成し、コンデンサ(37,38)によってI信号及びQ信号の直流成分を除去する。また、ローパスフィルタ(35,36)により、I信号及びQ信号の周波数より高い周波数成分を除去する。そして、ローパスフィルタを通過したI信号をI信号二乗部(43)で二乗し、Q信号をQ信号二乗部(44)で二乗し、さらに、加算部(45)で二乗したI信号とQ信号を加算する。そして、加算した信号(S1)のレベルをコンパレータ(18)で閾値(T1)と比較して信号(S2)を得、さらに、デジタル信号処理部(12)のデータ生成部(48)で信号(S2)の立ち上がり毎に信号レベルを反転する処理を行うことで受信データを復調する。
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