JP2008236617A - Reader/writer for non-contact ic tag and its signal transmission method - Google Patents

Reader/writer for non-contact ic tag and its signal transmission method Download PDF

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JP2008236617A
JP2008236617A JP2007076531A JP2007076531A JP2008236617A JP 2008236617 A JP2008236617 A JP 2008236617A JP 2007076531 A JP2007076531 A JP 2007076531A JP 2007076531 A JP2007076531 A JP 2007076531A JP 2008236617 A JP2008236617 A JP 2008236617A
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Yuichi Sakurai
祐一 櫻井
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Tokin Corp
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NEC Tokin Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a reader/writer for an IC tag for reducing the unnecessary spread of spectrum generated due to the frequency switching of a carrier frequency, and for suppressing the deterioration of transmitting efficiency without adding any special circuit. <P>SOLUTION: Frequency hopping processing is carried out during the transmission of a transmission signal 2, and when OFF modulation is set so that it is possible to suppress the transmission of any noise or unnecessary spurious in frequency hopping without deteriorating the transmitting efficiency or speed of communication data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、搬送波周波数を周波数切り替えパターン（ホッピングパターン）等に基づいて切り替えることでスペクトル拡散を行う周波数ホッピング送信を利用した非接触ＩＣタグ用リーダライタおよびその信号送信方法に関し、特に、搬送波周波数の周波数切り替え（周波数ホッピング）に伴い発生するスペクトルの不要な広がりを軽減させる技術に関する。   The present invention relates to a non-contact IC tag reader / writer using frequency hopping transmission that performs spectrum spreading by switching a carrier frequency based on a frequency switching pattern (hopping pattern) and the like, and more particularly to a carrier frequency of the carrier frequency. The present invention relates to a technique for reducing an unnecessary spread of a spectrum generated due to frequency switching (frequency hopping).

近年、非接触でデータの書き込みおよび読み出しを行うデータキャリア、ＲＦＩＤ（Radio Frequency Identification）、無線タグ、またはＩＣタグと呼称される通信媒体が普及しつつあり、現在ではこれら通信媒体を用いて、様々な種類の通信方法が開発されている。   In recent years, communication media called non-contact data writing and reading data, RFID (Radio Frequency Identification), wireless tags, or IC tags are becoming widespread. Various types of communication methods have been developed.

この通信媒体であるＩＣタグを読み取るための非接触ＩＣタグ用リーダライタ（以下、リーダライタと称す）の中でも、２．４５ＧＨｚ帯のリーダライタにおける移動体識別用無線設備標準規格として、ＡＲＩＢ ＳＴＤ−Ｔ８１がある。この規格では、電波法により、周波数ホッピング（Frequency Hopping Spectrum Spread）方式の使用が義務付けられており、広い周波数帯域を複数の周波数チャネルに分割し、その周波数チャネルを一定の規則に従いながらランダムに選択して使用している。   Among non-contact IC tag readers / writers (hereinafter referred to as reader / writers) for reading IC tags as communication media, ARIB STD- is used as a radio equipment standard for mobile object identification in 2.45 GHz reader / writers. There is T81. In this standard, the use of frequency hopping (Frequency Hopping Spectrum Spread) is obligated by the Radio Law, and a wide frequency band is divided into multiple frequency channels, and the frequency channels are randomly selected according to certain rules. Are used.

このため、特定の周波数チャネルで干渉（狭帯域干渉）が発生しても、別の周波数チャネルに切り替えることにより、狭帯域干渉を避けることができる利点がある。図４は、従来の周波数ホッピング時のノイズとスプリアスの説明図である。スプリアスとは、干渉によって生じる目的信号付近に発生する不要波である。周波数ホッピングの搬送波周波数の切り替え時は、一般的に、搬送波の立ち上がりや立ち下りに伴う波形変化や周波数変化中のオーバシュート、アンダーシュート、ノイズなどにより、図４のような不要な周波数やスペクトルの広がりが発生する。具体的には、搬送波の周波数ｆ１がｆ２に移動（ホッピング）する際に、一時的にｆｎのようなノイズ周波数が発生する場合がある。また、ｆ２のスプリアスが一時的に破線のように広がりを見せたりする。   For this reason, even if interference (narrowband interference) occurs in a specific frequency channel, there is an advantage that narrowband interference can be avoided by switching to another frequency channel. FIG. 4 is an explanatory diagram of noise and spurious during conventional frequency hopping. A spurious is an unnecessary wave generated in the vicinity of a target signal caused by interference. When switching the carrier frequency of frequency hopping, generally, an unnecessary frequency or spectrum such as that shown in FIG. 4 is generated due to a waveform change accompanying rising or falling of the carrier wave, overshoot, undershoot or noise during the frequency change. Spreading occurs. Specifically, when the carrier frequency f1 moves (hops) to f2, a noise frequency such as fn may be temporarily generated. In addition, the spurious of f2 temporarily spreads as shown by a broken line.

図５は、従来のリーダライタ送信部の回路構成ブロック図を表している。前記ノイズやスプリアスを低減するために、従来では例えば、図５に示すようなリーダライタ送信部が構成されている。この送信部は、搬送波発生器４、ＡＳＫ（Amplitude shift keying：振幅偏移）変調器５、変調波整形器８、電力増幅器６、空中線７を備える。搬送波発生器４には、周波数設定信号１ａと周波数切替信号１ｂが入力され、ここで搬送波４ａを生成する。ＡＳＫ変調器５では、送信信号２に基づいて前記搬送波４ａをＡＳＫ変調して変調波５ａを生成する。変調波整形器８では、この変調波５ａの波形を整形し、整形された変調波５ａは電力増幅器６で増幅されて送信波６ａとなる。この送信波６ａは空中線７により空中へ送信される。なお、電力増幅器６をコントロールするためには、増幅器制御信号３が必要となる。   FIG. 5 is a block diagram of a circuit configuration of a conventional reader / writer transmission unit. In order to reduce the noise and spurious, for example, a reader / writer transmission unit as shown in FIG. The transmission unit includes a carrier wave generator 4, an ASK (Amplitude Shift Keying) modulator 5, a modulated wave shaper 8, a power amplifier 6, and an antenna 7. The carrier wave generator 4 receives the frequency setting signal 1a and the frequency switching signal 1b, and generates the carrier wave 4a. The ASK modulator 5 performs ASK modulation on the carrier wave 4 a based on the transmission signal 2 to generate a modulated wave 5 a. The modulated wave shaper 8 shapes the waveform of the modulated wave 5a, and the shaped modulated wave 5a is amplified by the power amplifier 6 to become a transmission wave 6a. This transmission wave 6a is transmitted to the air via the antenna 7. In order to control the power amplifier 6, an amplifier control signal 3 is required.

図６は、増幅器制御信号３を使用した従来の周波数ホッピング制御を説明するための信号波形の模式図である。搬送波周波数の切り替え時のノイズやスプリアスの不要な広がりを抑えるため、増幅器制御信号３により送信波６ａの出力を制御している。この周波数切り替えの期間、増幅器制御信号３をＬ（Ｌｏｗ）状態に保ち、送信波のレベルを抑えている。また、図６は、図５のリーダライタ送信部による送信波６ａの構成手順を示している。搬送波４ａは、周波数設定信号１ａによって変更する周波数が決定され、更に周波数切替信号１ｂによって切替タイミングが設定される。搬送波４ａは、この周波数切替信号１ｂにより設定された切替タイミングによって、その周波数がｆ１、ｆ２、ｆ３の順に切り替えられる。   FIG. 6 is a schematic diagram of signal waveforms for explaining the conventional frequency hopping control using the amplifier control signal 3. The output of the transmission wave 6a is controlled by the amplifier control signal 3 in order to suppress unnecessary spread of noise and spurious at the time of switching the carrier frequency. During this frequency switching period, the amplifier control signal 3 is kept in the L (Low) state, and the level of the transmission wave is suppressed. FIG. 6 shows a configuration procedure of the transmission wave 6a by the reader / writer transmission unit of FIG. In the carrier wave 4a, the frequency to be changed is determined by the frequency setting signal 1a, and the switching timing is further set by the frequency switching signal 1b. The frequency of the carrier wave 4a is switched in the order of f1, f2, and f3 according to the switching timing set by the frequency switching signal 1b.

なお、搬送波発生器４は、一般的に無線用の安定した周波数信号を作り出す方法の１つとして、ＶＣＯ(Voltage Controlled Oscillator：電圧制御発振器）とＰＬＬ（Phase Locked Loop：位相周期回路）とを組み合わせた、もしくはＤＤＳ（Direct Digital Synthesizer：直接デジタル合成方式信号発生器）、もしくは上記２者とを組み合わせた回路で構成される。   The carrier wave generator 4 is a combination of a VCO (Voltage Controlled Oscillator) and a PLL (Phase Locked Loop) as one of the methods for generating a stable frequency signal for radio. Alternatively, it is composed of a DDS (Direct Digital Synthesizer) or a circuit combining the above two.

特許文献１では、ＤＤＳにおいて、搬送波周波数の切り替え時に出力振幅を制限することにより、搬送波周波数の切り替えに伴い発生するノイズスペクトルの低減方法が記載されている。   Patent Document 1 describes a method of reducing a noise spectrum that occurs with switching of a carrier frequency by limiting an output amplitude when switching the carrier frequency in DDS.

また、特許文献２では、変調器と電力増幅器の間に波形整形回路を追加することにより送信波形の波形変化を滑らかにする手段などが記載されている。   Patent Document 2 describes means for smoothing the waveform change of the transmission waveform by adding a waveform shaping circuit between the modulator and the power amplifier.

特開平８−６５０５４号公報JP-A-8-65054 特開平１１−２２０４２６号公報JP-A-11-220426

しかしながら、従来の方法では、ノイズやスプリアスの低減を解決するのみで、データ通信の伝送効率は考慮されていなかった。送信信号を送信中に搬送波の出力を低下させることは、送信信号に自らノイズを加えることでもあり、データ通信の伝送効率の低下につながっていた。   However, the conventional method only solves the reduction of noise and spurious and does not consider the transmission efficiency of data communication. Decreasing the output of the carrier wave during transmission of the transmission signal also adds noise to the transmission signal itself, leading to a decrease in transmission efficiency of data communication.

特許文献１のような、増幅器制御信号によって、ノイズやスプリアスの低減を図る方法では、電力増幅器を入出力する際の速度変化が遅いため、送信信号に含まれる通信データを、周波数ホッピングで一旦途切れた送信信号を再び次への送信に移行するためには、途切れた間の間隔を広く確保する必要があり、これによっても通信速度が低下するという問題があった。また、特許文献２のような手段においては、波形を整形するための波形整形回路を追加する必要があるため、装置が大型化し、コストが増大するという問題があった。   In the method of reducing noise and spurious by the amplifier control signal as in Patent Document 1, since the speed change when inputting / outputting the power amplifier is slow, the communication data included in the transmission signal is temporarily interrupted by frequency hopping. In order to transfer the transmitted signal to the next transmission again, it is necessary to ensure a wide interval between the interruptions, which also causes a problem that the communication speed is lowered. Further, in the means as disclosed in Patent Document 2, it is necessary to add a waveform shaping circuit for shaping the waveform, so that there is a problem that the apparatus becomes large and the cost increases.

本発明は、上記問題点を解決するためになされたものであり、搬送波周波数の周波数切り替えに伴い発生するスペクトルの不要な広がりを低減し、かつ特別な回路の追加を行わずに、伝送効率の低下が抑制される非接触ＩＣタグ用リーダライタおよびその信号送信方法を提供することを目的とする。   The present invention has been made to solve the above-described problems, and reduces the unnecessary spread of the spectrum caused by the frequency switching of the carrier frequency, and improves the transmission efficiency without adding a special circuit. It is an object of the present invention to provide a reader / writer for a non-contact IC tag and a signal transmission method thereof in which the decrease is suppressed.

上記目的を達成する本発明は、送信信号をＡＳＫ変調および周波数ホッピング方式で送信する非接触ＩＣタグ用リーダライタであって、搬送波周波数の周波数切り替えタイミングを含む所定時間にわたって、前記送信信号をＯＦＦ変調するＯＦＦ変調手段を有することを特徴とする非接触ＩＣタグ用リーダライタである。   The present invention that achieves the above object is a non-contact IC tag reader / writer for transmitting a transmission signal by ASK modulation and frequency hopping, and the transmission signal is OFF-modulated over a predetermined time including a frequency switching timing of a carrier frequency. A non-contact IC tag reader / writer characterized by having an OFF modulation means.

上記目的を達成する本発明は、送信信号をＡＳＫ変調および周波数ホッピング方式で送信し、前記ＡＳＫ変調として、ＯＦＦ変調手段を利用する非接触ＩＣタグ用リーダライタであって、前記送信信号中に含まれるデータ通信中のＯＦＦ変調となるタイミングで、搬送波周波数を切り替える周波数切替手段を有することを特徴とする非接触ＩＣタグ用リーダライタである。   The present invention for achieving the above object is a non-contact IC tag reader / writer that transmits a transmission signal by ASK modulation and frequency hopping, and uses an OFF modulation means as the ASK modulation, and is included in the transmission signal. A non-contact IC tag reader / writer comprising frequency switching means for switching a carrier wave frequency at a timing of OFF modulation during data communication.

また、上記目的を達成する本発明は、送信信号をＡＳＫ変調および周波数ホッピング方式で送信する非接触ＩＣタグ用リーダライタの信号送信方法であって、搬送波周波数の周波数切り替えタイミングを含む所定時間にわたって、前記送信信号をＯＦＦ変調することを特徴とする非接触ＩＣタグ用リーダライタの信号送信方法である。   Further, the present invention that achieves the above object is a signal transmission method of a contactless IC tag reader / writer for transmitting a transmission signal by ASK modulation and frequency hopping, over a predetermined time including a frequency switching timing of a carrier frequency, A signal transmission method for a reader / writer for a non-contact IC tag, wherein the transmission signal is OFF-modulated.

更に、上記目的を達成する本発明は、送信信号をＡＳＫ変調および周波数ホッピング方式で送信し、前記ＡＳＫ変調として、ＯＦＦ変調手段を利用する非接触ＩＣタグ用リーダライタの信号送信方法であって、前記送信信号中に含まれるデータ通信中のＯＦＦ変調となるタイミングで、搬送波周波数を切り替えることを特徴とする非接触ＩＣタグ用リーダライタの信号送信方法である。   Furthermore, the present invention for achieving the above object is a signal transmission method of a reader / writer for a non-contact IC tag that transmits a transmission signal by ASK modulation and frequency hopping, and uses an OFF modulation means as the ASK modulation, A signal transmission method for a reader / writer for a non-contact IC tag, wherein the carrier frequency is switched at a timing of OFF modulation during data communication included in the transmission signal.

本発明によれば、特殊な回路を追加することなく、ＡＳＫ変調方式のリーダライタにおいて周波数ホッピング時に発生するスプリアスの不要な広がりを抑えることが可能となる。   According to the present invention, it is possible to suppress unnecessary spread of spurious generated during frequency hopping in an ASK modulation type reader / writer without adding a special circuit.

また、本発明の第２の発明によれば、周波数ホッピング期間中に送信を中断する必要がなくなり、通信データの送信途中で周波数ホッピングを行うので、通信データを、ノイズやスプリアスの低減を図るために一旦中断する必要がなくなり、通信データの伝送効率の低下を抑えることが可能となる。   Further, according to the second aspect of the present invention, it is not necessary to interrupt transmission during the frequency hopping period, and frequency hopping is performed in the middle of transmission of communication data, so that communication data can be reduced in noise and spurious. Therefore, it is not necessary to interrupt the communication data once, and it is possible to suppress a decrease in transmission efficiency of communication data.

以下、本発明を実施するための実施の形態を図面を用いて詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

図１は、本発明の第１の実施の形態に係るＩＣタグ用リーダライタの送信部のブロック図である。この送信部は、搬送波発生器４、ＡＳＫ変調器５、電力増幅器６、空中線７を備える。搬送波発生器４には、周波数設定信号１ａと周波数切替信号１ｂが入力され、ここで搬送波４ａが生成される。ＡＳＫ変調器５では、送信信号２に基づいて前記搬送波４ａをＡＳＫ変調して変調波５ａを生成する。変調波５ａは電力増幅器６で増幅されて送信波６ａとなる。この送信波６ａは空中線７により空中へ送信される。   FIG. 1 is a block diagram of a transmitter of an IC tag reader / writer according to the first embodiment of the present invention. The transmission unit includes a carrier wave generator 4, an ASK modulator 5, a power amplifier 6, and an antenna 7. The carrier wave generator 4 receives the frequency setting signal 1a and the frequency switching signal 1b, and generates the carrier wave 4a. The ASK modulator 5 performs ASK modulation on the carrier wave 4 a based on the transmission signal 2 to generate a modulated wave 5 a. The modulated wave 5a is amplified by the power amplifier 6 to become a transmission wave 6a. This transmission wave 6a is transmitted to the air via the antenna 7.

ここで、ＡＳＫ変調とは振幅に情報を持たせた変調方式のことで、送信したいデータが時刻ｔで変化する関数Ｄ（ｔ）で表される場合、最も単純なＡＳＫの変調では、ＡＳＫの変調を施した波形Ｙ（ｔ）は次式（１）で表される。
Ｙ（ｔ）＝Ｄ（ｔ）×ｓｉｎ（２πｆｔ＋θ）・・・・・（１）
Ｄ（ｔ）は、最も単純な場合では、１か０の値をとる。図７は、ＡＳＫ変調の説明図である。図７のように、Ｄ（ｔ）＝１のときは振幅１の正弦波になり、Ｄ（ｔ）＝０のときはＹ（ｔ）＝０で何もない状態になる。このＹ（ｔ）＝０の状態に変調するのがＯＦＦ変調となる。 Here, ASK modulation is a modulation method in which information is given to amplitude. When the data to be transmitted is represented by a function D (t) that changes at time t, in the simplest ASK modulation, the ASK modulation is used. The modulated waveform Y (t) is expressed by the following equation (1).
Y (t) = D (t) × sin (2πft + θ) (1)
D (t) takes a value of 1 or 0 in the simplest case. FIG. 7 is an explanatory diagram of ASK modulation. As shown in FIG. 7, when D (t) = 1, the amplitude is a sine wave of 1, and when D (t) = 0, Y (t) = 0 and there is nothing. The modulation to the state of Y (t) = 0 is OFF modulation.

ＡＳＫ変調器５がＯＦＦ変調手段を備えている場合には、このＯＦＦ変調手段を利用すれば良い。本願発明では、ＡＳＫ変調器５のＯＦＦ変調を利用する場合は、搬送波周波数の周波数切替タイミング（周波数をｆ１からｆ２へ、またｆ２からｆ３へ切り替えるタイミング）を含む所定時間にわたって、送信信号２をＬ状態に固定することでＯＦＦ変調するようにできる。また、別の方法としては、スイッチを用いてＯＦＦにすることにより簡単にＯＦＦ変調することができる。具体的には、周波数切替信号１ｂにより設定される切替タイミングを基準に、数ミリから数十ミリ秒前から始まり、切替タイミングから数ミリから数十ミリ秒後に終了する期間、ＯＦＦ変調を行う。この結果、変調波５ａおよび送信波６ａの出力を抑えることが可能になり、ホッピングによるノイズやスプリアスの広がりを低減することができる。つまり、波形整形回路等の特殊な回路に頼ることなく、送信信号２もしくはスイッチによって、変調波５ａを制御することでスプリアスを抑えることができる。   If the ASK modulator 5 includes an OFF modulation means, this OFF modulation means may be used. In the present invention, when the OFF modulation of the ASK modulator 5 is used, the transmission signal 2 is set to L over a predetermined time including the frequency switching timing of the carrier frequency (timing to switch the frequency from f1 to f2 and from f2 to f3). It is possible to perform OFF modulation by fixing the state. As another method, OFF modulation can be easily performed by turning OFF using a switch. Specifically, with reference to the switching timing set by the frequency switching signal 1b, OFF modulation is performed during a period starting from several milliseconds to several tens of milliseconds and ending several milliseconds to several tens of milliseconds after the switching timing. As a result, the output of the modulated wave 5a and the transmission wave 6a can be suppressed, and the spread of noise and spurious due to hopping can be reduced. That is, spurious can be suppressed by controlling the modulated wave 5a by the transmission signal 2 or the switch without depending on a special circuit such as a waveform shaping circuit.

図２に、本発明の第１の実施の形態に係るＩＣタグ用リーダライタによる周波数ホッピング制御を説明するための信号波形の模式図を示す。本実施の形態では、ＡＳＫ変調器５がＯＦＦ変調手段を備えている場合である。周波数設定信号１ａを送信した後、周波数切替信号１ｂをＬにすると搬送波４ａの周波数が切り替えられる。なお、図８は搬送波４ａの波形を模式的に表した図である。その周波数範囲をｆ１、ｆ２、ｆ３で示している。   FIG. 2 is a schematic diagram of signal waveforms for explaining frequency hopping control by the IC tag reader / writer according to the first embodiment of the present invention. In this embodiment, the ASK modulator 5 includes an OFF modulation means. After transmitting the frequency setting signal 1a, when the frequency switching signal 1b is set to L, the frequency of the carrier wave 4a is switched. FIG. 8 is a diagram schematically showing the waveform of the carrier wave 4a. The frequency range is indicated by f1, f2, and f3.

また、図２において、搬送波４ａに対して送信信号２でＡＳＫ変調をかけたものが変調波５ａとなっている。変調波５ａは電力増幅器６で増幅され、送信波６ａとなる。このため、送信信号２でデータ通信をしている間は、その信号に対応して送信波６ａの変調信号部が表れ、データ通信をＨ（Ｈｉｇｈ）状態に固定していると、対応する無変調信号が表れる。また、送信信号２をＬ状態に固定することで、ＯＦＦ変調により送信波６ａも振幅を小さくすることができる。   Further, in FIG. 2, a modulated wave 5a is obtained by subjecting the carrier wave 4a to ASK modulation using the transmission signal 2. The modulated wave 5a is amplified by the power amplifier 6 to become a transmission wave 6a. For this reason, while data communication is being performed with the transmission signal 2, the modulation signal portion of the transmission wave 6a appears corresponding to the signal, and if the data communication is fixed to the H (High) state, there is no corresponding. A modulated signal appears. Further, by fixing the transmission signal 2 to the L state, the amplitude of the transmission wave 6a can also be reduced by OFF modulation.

図３に、本発明の第２の実施の形態に係る周波数ホッピング制御を説明するための信号波形の模式図を示す。図３は、送信信号２のデータ通信時の通信信号１２のみを表しており、図２，６よりも時間軸を拡大している。仮にここで、通信信号１２は、一定時間内にＬ（Ｌｏｗ）パルスが２回発生すると「１」、Ｌパルスが１回発生すると「０」を示すこととする。ここで、Ｌパルスの場合はＯＦＦ変調となっている。この通信信号１２において、Ｌパルスの出力がなされる、つまり、Ｌｏｗのパルスを発生させる瞬間というのは、ＡＳＫ変調におけるＯＦＦ変調が行われているので、その間に、周波数切替信号１ｂから切り替え指示を出すようにし、搬送波４ａが周波数ｆ１から周波数ｆ２に切り替えるようにする。   FIG. 3 shows a schematic diagram of signal waveforms for explaining the frequency hopping control according to the second embodiment of the present invention. FIG. 3 shows only the communication signal 12 at the time of data communication of the transmission signal 2, and the time axis is expanded as compared with FIGS. Here, it is assumed that the communication signal 12 indicates “1” when the L (Low) pulse is generated twice within a predetermined time, and indicates “0” when the L pulse is generated once. Here, in the case of the L pulse, OFF modulation is performed. In this communication signal 12, an L pulse is output, that is, a moment when a Low pulse is generated, because OFF modulation in ASK modulation is performed, and during that time, a switching instruction is issued from the frequency switching signal 1b. The carrier wave 4a is switched from the frequency f1 to the frequency f2.

この結果、通信信号１２中に通信データの基本パルスとなっているＬパルスを用い、この送信波６ａの強度が低くなっている時間内に周波数ホッピングを行うので、ホッピング時に発生するノイズやスプリアスの広がりを抑えることが可能となる。また、通信信号１２における通信データの送信途中でホッピングを行うため、データ通信を一時的に中断する必要も無くなる。   As a result, the L pulse that is the basic pulse of the communication data is used in the communication signal 12 and the frequency hopping is performed within the time when the intensity of the transmission wave 6a is low. It becomes possible to suppress the spread. Further, since hopping is performed in the middle of transmission of communication data in the communication signal 12, there is no need to temporarily interrupt data communication.

この制御方法を実現するには、ＩＣタグ用リーダライタにおける送信部に、搬送波発生器４とＡＳＫ変調器５、電力増幅器６、空中線７、および、送信信号２のＯＦＦ変調タイミングに合わせて周波数ホッピングが行われるよう、周波数設定信号１ａおよび周波数切替信号１ｂを発生して搬送波発生器４に入力する信号生成器とを備えるようにすれば良い。   In order to realize this control method, a frequency hopping is performed in accordance with the OFF modulation timing of the carrier wave generator 4, the ASK modulator 5, the power amplifier 6, the antenna 7, and the transmission signal 2 in the transmitter in the IC tag reader / writer. And a signal generator that generates the frequency setting signal 1 a and the frequency switching signal 1 b and inputs the frequency setting signal 1 a and the frequency switching signal 1 b to the carrier wave generator 4.

本発明の第１の実施の形態に係るＩＣタグ用リーダライタにおける送信部のブロック図。The block diagram of the transmission part in the reader / writer for IC tags which concerns on the 1st Embodiment of this invention. 本発明の第１の実施の形態に係るＩＣタグ用リーダライタによる周波数ホッピング制御を説明するための信号波形の模式図。The schematic diagram of the signal waveform for demonstrating the frequency hopping control by the reader / writer for IC tags which concerns on the 1st Embodiment of this invention. 本発明の第２の実施の形態に係る周波数ホッピング制御を説明するための信号波形の模式図。The schematic diagram of the signal waveform for demonstrating the frequency hopping control which concerns on the 2nd Embodiment of this invention. 従来の周波数ホッピング時のノイズとスプリアスの説明図。Explanatory drawing of the noise and spurious at the time of the conventional frequency hopping. 従来のリーダライタ送信部の回路構成ブロック図。The circuit block diagram of the conventional reader / writer transmission part. 増幅器制御信号を使用した従来の周波数ホッピング制御を説明するための信号波形の模式図。The schematic diagram of the signal waveform for demonstrating the conventional frequency hopping control using an amplifier control signal. ＡＳＫ変調の説明図。Explanatory drawing of ASK modulation. 搬送波の波形を模式的に表した図。The figure which represented the waveform of the carrier wave typically.

符号の説明Explanation of symbols

１ａ 周波数設定信号
１ｂ 周波数切替信号
２ 送信信号
３ 増幅器制御信号
４ 搬送波発生器
４ａ 搬送波
５ ＡＳＫ変調器
５ａ 変調波
６ 電力増幅器
６ａ 送信波
７ 空中線
８ 変調波整形器
１２ 通信信号 1a Frequency setting signal 1b Frequency switching signal 2 Transmission signal 3 Amplifier control signal 4 Carrier generator 4a Carrier 5 ASK modulator 5a Modulated wave 6 Power amplifier 6a Transmitted wave 7 Antenna 8 Modulated wave shaper 12 Communication signal

Claims (4)

送信信号をＡＳＫ変調および周波数ホッピング方式で送信する非接触ＩＣタグ用リーダライタであって、搬送波周波数の周波数切り替えタイミングを含む所定時間にわたって、前記送信信号をＯＦＦ変調するＯＦＦ変調手段を有することを特徴とする非接触ＩＣタグ用リーダライタ。   A contactless IC tag reader / writer for transmitting a transmission signal by ASK modulation and frequency hopping, and comprising OFF modulation means for performing OFF modulation on the transmission signal over a predetermined time including a frequency switching timing of a carrier frequency. Non-contact IC tag reader / writer. 送信信号をＡＳＫ変調および周波数ホッピング方式で送信し、前記ＡＳＫ変調として、ＯＦＦ変調手段を利用する非接触ＩＣタグ用リーダライタであって、前記送信信号中に含まれるデータ通信中のＯＦＦ変調となるタイミングで、搬送波周波数を切り替える周波数切替手段を有することを特徴とする非接触ＩＣタグ用リーダ・ライタ。   A non-contact IC tag reader / writer that transmits a transmission signal by ASK modulation and frequency hopping and uses an OFF modulation means as the ASK modulation, and becomes OFF modulation during data communication included in the transmission signal. A reader / writer for a non-contact IC tag, comprising frequency switching means for switching a carrier frequency at timing. 送信信号をＡＳＫ変調および周波数ホッピング方式で送信する非接触ＩＣタグ用リーダライタの信号送信方法であって、搬送波周波数の周波数切り替えタイミングを含む所定時間にわたって、前記送信信号をＯＦＦ変調することを特徴とする非接触ＩＣタグ用リーダライタの信号送信方法。   A signal transmission method of a contactless IC tag reader / writer for transmitting a transmission signal by ASK modulation and frequency hopping, wherein the transmission signal is OFF-modulated over a predetermined time including a frequency switching timing of a carrier frequency. A signal transmission method for a reader / writer for a non-contact IC tag. 送信信号をＡＳＫ変調および周波数ホッピング方式で送信し、前記ＡＳＫ変調として、ＯＦＦ変調手段を利用する非接触ＩＣタグ用リーダライタの信号送信方法であって、前記送信信号中に含まれるデータ通信中のＯＦＦ変調となるタイミングで、搬送波周波数を切り替えることを特徴とする非接触ＩＣタグ用リーダライタの信号送信方法。   A signal transmission method of a reader / writer for a non-contact IC tag that transmits a transmission signal by an ASK modulation and a frequency hopping method, and uses an OFF modulation means as the ASK modulation, in which data communication included in the transmission signal is being performed A signal transmission method for a reader / writer for a non-contact IC tag, characterized in that the carrier wave frequency is switched at the timing of OFF modulation.
JP2007076531A 2007-03-23 2007-03-23 Reader/writer for non-contact ic tag and its signal transmission method Pending JP2008236617A (en)

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