JP3080879B2 - Wireless telephone device - Google Patents

Wireless telephone device

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Publication number
JP3080879B2
JP3080879B2 JP08133385A JP13338596A JP3080879B2 JP 3080879 B2 JP3080879 B2 JP 3080879B2 JP 08133385 A JP08133385 A JP 08133385A JP 13338596 A JP13338596 A JP 13338596A JP 3080879 B2 JP3080879 B2 JP 3080879B2
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intermediate frequency
band
broadband
changeover switch
bandwidth
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JPH09321691A (en
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満 田中
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埼玉日本電気株式会社
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Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、携帯電話機等の受信機の中間周波数回路の構成に関し、特に、IF(中間周波数)帯域幅の異なった2つのセルラー電話システムで、両システム使用可能な無線電話装置の中間周波数回路の構成に関する。 The present invention relates to relates to structure of the intermediate frequency circuit of the receiver such as a mobile phone, in particular, IF (intermediate frequency) in two different cellular telephone systems bandwidth, both systems available wireless relating to the configuration of the intermediate frequency circuit of the telephone apparatus.

【0002】 [0002]

【従来の技術】従来技術として、特開昭57−1843 As the prior art, JP-A-57-1843
28号公報に記載の受信機のIF帯域幅の切換え制御装置がある。 28 No. there is switching control unit IF bandwidth of the receiver according. 図2に、この従来装置の構成を示す。 2 shows a configuration of the conventional apparatus. 図2において、11は広帯域BPF(Bandpass Fi 2, 11 is a broadband BPF (Bandpass Fi
lter)、13は狭帯域BPF、12と14は切換えスイッチ、15はIF(Intermediate F lter), 13 narrowband BPF, 12 and 14 changeover switch, 15 IF (Intermediate F
requency)レベル検出器、16はORゲート、 Requency) level detector, 16 is an OR gate,
17はAM検波器、18は9KHzビートレベル検出器をそれぞれ示す。 17 AM detector, 18 denotes a 9KHz beat level detector.

【0003】このような受信機のIF帯域幅の切換え制御装置においては、隣接信号と希望波信号とのビート成分を、AM検波器17で検出し、隣接チャンネルとの周波数間隔9KHz成分を、9KHzビートレベル検出器18で更に選択検出し、この検出レベルがある値以上になった時に、切換えスイッチ12,14を狭帯域BPF [0003] In the switching control unit of the IF bandwidth of such a receiver, the beat component between the adjacent signal and the desired signal is detected by the AM detector 17, the frequency interval 9 KHz component of the adjacent channel, 9 KHz further selected detected by the beat level detector 18, when it is above a certain value this detection level, narrow band BPF changeover switch 12 and 14
13側へ切換えるように制御し、IF帯域幅を狭帯域特性として、隣接波による混信妨害を排除している。 Controlled to switch to the 13 side, the IF bandwidth as narrow band characteristics, and eliminates interference interference by the adjacent waves.

【0004】また、IFレベル検出器15によって、受信電界強度が、所定レベル以下となった場合は、同様に、切換えスイッチ12,14を狭帯域BPF13側へ切換えるように制御し、IF帯域幅を狭帯域特性として、低電界時のS/N向上を図っている。 Further, the IF level detector 15, received signal strength, if it reaches a predetermined level or less, similarly controls to switch the changeover switch 12 and 14 to narrowband BPF13 side, the IF bandwidth as a narrow-band characteristics, thereby achieving an improvement in S / N at the time of a low electric field.

【0005】このように、図2の従来技術では、混信発生時および低電界時に、IF帯域幅を狭帯域へ切換えて、混信妨害の排除、希望信号のS/N向上を図る利点がある。 [0005] Thus, in the prior art of FIG. 2, when the interference occurs and then a low electric field, by switching the IF bandwidth to narrowband, elimination of interference disturbance, there is an advantage to achieve improvement in S / N of the desired signal.

【0006】しかし、図2の従来例の構成では、IF帯域幅の異なる2つのセルラー電話システムの両方で使用可能な、中間周波数回路を提供できないという問題がある。 However, in the conventional configuration of FIG. 2, which can be used in both of the two cellular telephone system having different IF bandwidth, it is impossible to provide an intermediate frequency circuit.

【0007】このような問題を解決した装置例を、図3 [0007] The example device which has solved this problem, Fig 3
に示す。 To show. 1は受信ミキサー回路、2は広帯域IFフィルタ、3は狭帯域IFフィルタ、4,5は切換えスイッチ、7は中間周波数増幅回路(IF増幅器)、8は復調器(ディスクリミネータ)、9はIF帯域幅切換え制御信号を示す。 1 the receiving mixer circuit, 2 a broadband IF filter, the narrow-band IF filter 3, the changeover switch 4 and 5, an intermediate frequency amplifying circuit 7 (IF amplifier), 8 demodulator (discriminator), 9 IF It shows the bandwidth switching control signal. 北米等の地域における、AMPS(Adv In the region of North America, such as, AMPS (Adv
anced Mobile Phone servic anced Mobile Phone servic
e)システムとナローAMPSシステム(以下、NAM e) system and narrow AMPS system (hereinafter, NAM
PSシステム)との両システムで動作可能な、デュアルシステム対応携帯電話機等に代表される無線電話装置では、基地局より、IF帯域幅が広帯域なAMPSシステムに指定された場合、図示されていない制御部よりのI PS System) and capable of operating in both systems, a wireless telephone device such as a dual system-enabled mobile phone, etc., from the base station, if the IF bandwidth is specified in broadband AMPS system, the control (not shown) I of from part
F帯域幅切換え制御信号9により、切換えスイッチ4, The F-bandwidth switching control signal 9, the changeover switch 4,
5は、広帯域IFフィルタ2側へ切換えるよう制御される。 5 is controlled so as to switch to the wideband IF filter 2 side. 受信信号は、受信ミキサー回路1から、広帯域IF The received signal from the receiving mixer circuit 1, a broadband IF
フィルタ2を経由し、IF増幅器7で増幅され、復調器8で復調され、受信音声またはデータへ変換される。 Via the filter 2 is amplified by the IF amplifier 7 is demodulated by the demodulator 8, and is converted to a received voice or data.

【0008】一方、基地局より、IF帯域幅が狭帯域なNAMPSシステムに指定された場合、同様に、IF帯域幅切換え制御信号9により、切換えスイッチ4,5 On the other hand, from the base station, if the IF bandwidth is specified to narrow-band NAMPS system, similarly, the IF bandwidth switching control signal 9, the changeover switch 4, 5
は、狭帯域IFフィルタ3側へ切換えるよう制御される。 It is controlled to switch to the narrowband IF filter 3 side. 受信信号は、受信ミキサー回路1から、狭帯域IF The received signal from the receiving mixer circuit 1, narrowband IF
フィルタ3を経由し、IF増幅器7で増幅され、復調器8で復調され、受信音声またはデータへ変換される。 Via the filter 3 is amplified by the IF amplifier 7 is demodulated by the demodulator 8, and is converted to a received voice or data.

【0009】 [0009]

【発明が解決しようとする課題】図3に示す従来の回路構成では、狭帯域のセルラー電話システムで動作させた場合、特に、フェージング有時の受信ビットエラーレイトが悪化し、接続率が劣化する問題があった。 In the conventional circuit configuration shown in FIG. 3 [0006], when operated in a narrow band cellular telephone system, in particular, received bit error rate at the time of fading Yes is deteriorated, connection rate is degraded there was a problem.

【0010】これは、IF帯域幅が狭帯域と広帯域との両方の場合で、IF増幅器7を共通使用しているため、 [0010] This is because if the IF bandwidth of both narrowband and wideband, since the IF amplifier 7 is common use,
IF増幅器7の利得を広帯域で最適となる様に設定した場合、狭帯域では、IF増幅器の利得が不足し、フェージング等の入力電界変動時に、良好な受信機性能を発揮できないことによる。 If you set the gain of the IF amplifier 7 so as to be the best in a wide band, in the narrow-band, gain is lack of the IF amplifier, at the time of input electric field fluctuations of fading or the like, due to the fact that can not exhibit good receiver performance.

【0011】一般的に、狭帯域では、帯域が狭い分、サーマルノイズが低下するため、受信機のトータルゲインは、広帯域よりも多く必要とする。 [0011] Generally, in a narrow band, frequency band is narrow, since the thermal noise is reduced, the total gain of the receiver is often requires than broadband.

【0012】一方、IF増幅器7の利得を、狭帯域で最適となる様に設定した場合、広帯域では、IF増幅器の利得が過剰となり、増幅器の飽和点が中から強の入力電界でも起こってしまい、中から強の入力電界の場合、受信歪率の劣化を引き起こす欠点があった。 [0012] On the other hand, if you set the gain of the IF amplifier 7, as the best in a narrow band, in the wide-band, the gain of the IF amplifier is excessive, it would also occurred in the input electric field strength from in the saturation point of the amplifier when the input electric field intensity from, there is a drawback of causing deterioration of reception distortion.

【0013】本発明の目的は、上述の欠点を除去し、I An object of the present invention is to eliminate the aforementioned drawbacks, I
F帯域幅の異なる複数のセルラー電話システムで動作可能な無線電話装置を提供することにある。 It is to provide an operable radiotelephone in different cellular telephone systems with F bandwidth.

【0014】 [0014]

【課題を解決するための手段】受信機のIF帯域幅を広帯域と狭帯域へ切換えて、複数の異なったセルラー電話システムで動作する無線電話装置において、IF帯域幅が、狭帯域幅へ切換わった場合、受信機のIF増幅回路の利得を、広帯域の場合よりも増加させる手段を有する。 Means for Solving the Problems] The IF bandwidth of the receiver is switched to the wideband and narrowband, the radiotelephone device operating in several different cellular telephone systems, IF bandwidth, switching instead to narrowband If the gain of the IF amplifier circuit in the receiver comprises means for increasing than broadband.

【0015】具体的には、IF帯域幅を切換える切換えスイッチの経路が狭帯域側へ切換わると、IF増幅器の利得が、広帯域時のIF増幅器の利得に加算されるため、狭帯域時の利得は、広帯域時より増加し、狭帯域時に最適な利得に設定できる。 [0015] Specifically, when the path of the switch for switching the IF bandwidth switching switched to the narrow bandwidth side, the gain of the IF amplifier is added to the gain of the IF amplifier when the broadband, narrowband time gain It is to increase from the time of broadband, can be set to the optimum gain to a narrow band at the time.

【0016】 [0016]

【発明の実施の形態】以下、図面に基づいて、本発明の無線電話装置の実施例を説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the drawings, an embodiment of a wireless telephone apparatus of the present invention.

【0017】図1は、本発明の一実施例のブロック図を示す。 [0017] Figure 1 shows a block diagram of an embodiment of the present invention. この無線電話装置は、図3の従来例の構成に加え、IF増幅器6が、狭帯域IFフィルタ3側へ、追加された構成となっている。 The wireless telephone device in addition to the conventional configuration in FIG. 3, IF amplifier 6, the narrow-band IF filter 3 side, has an additional configuration. すなわち、受信ミキサー回路1を備え、その出力は切換えスイッチ4の接点4aに接続されている。 That is, a reception mixer circuit 1, the output of which is connected to the contact 4a of the switch 4. 切換えスイッチ4の接点4bは、狭帯域IFフィルタ3およびIF増幅器6を経て、切換えスイッチの接点5bに接続されている。 Contact 4b of the switch 4 via a narrowband IF filter 3 and the IF amplifier 6 are connected to the contact 5b of the switch. また、切換えスイッチ4の接点4cは、広帯域IFフィルタ2を経て、切換えスイッチの接点5cに接続されている。 Further, the contact 4c of the switch 4 via a broadband IF filter 2 is connected to the contact 5c of the switch.

【0018】切換えスイッチ5の接点5aは、IF増幅器7の入力に接続され、増幅器7の出力は復調器(ディスクリミネータ)8の入力に接続されている。 The contact 5a of the changeover switch 5 is connected to the input of the IF amplifier 7, the output of the amplifier 7 is connected to the input of the demodulator (discriminator) 8. 切換えスイッチ4,5は、IF帯域幅切換え制御信号9により、 Changeover switch 4 and 5, the IF bandwidth switching control signal 9,
その切換えが制御される。 The switching is controlled.

【0019】次に、本実施例の動作について説明する。 Next, the operation of this embodiment will be described.

【0020】基地局(図示せず)より、IF帯域幅が広帯域に指定された場合、IF帯域幅切換え制御信号9により、切換えスイッチ4,5は、広帯域IFフィルタ2 [0020] from the base station (not shown), if the IF bandwidth is specified in broadband, the IF bandwidth switching control signal 9, the changeover switch 4 and 5, a broadband IF filter 2
側へ切換えるよう制御される。 It is controlled so as to switch to the side. すなわち、切換えスイッチ4では接点4aと接点4cとが接続され、切換えスイッチ5では接点5aと接点5cとが接続されている。 That, is connected to the contact point 4c contacts 4a in the changeover switch 4, is connected to the contacts 5a in changeover switch 5 and the contact 5c.

【0021】このような切換えスイッチ4,5の切換え状態では、受信信号は、受信ミキサー回路1から、広帯域IFフィルタ2を経由し、IF増幅器7で増幅され、 [0021] In switching state of such changeover switches 4 and 5, the received signal from the receiving mixer circuit 1, via the broadband IF filter 2 is amplified by the IF amplifier 7,
復調器8で復調され、受信音声またはデータへ変換される。 Demodulated by the demodulator 8, and is converted to a received voice or data. ここで、IF増幅器7の利得は、広帯域のとき最適となるように設定されている。 Here, the gain of the IF amplifier 7 is set to be optimum when broadband.

【0022】一方、基地局より、IF帯域幅が狭帯域に指定された場合、IF帯域幅切換え制御信号9により、 On the other hand, from the base station, if the IF bandwidth is specified to narrowband, the IF bandwidth switching control signal 9,
切換えスイッチ4,5は、狭帯域IFフィルタ3側へ切換えるよう制御される。 Changeover switches 4 and 5 are controlled to switch to the narrowband IF filter 3 side. すなわち、切換えスイッチ4では接点4aと接点4bとが接続され、切換えスイッチ5 That is, in the changeover switch 4 and the contact 4a and the contact 4b is connected, changeover switch 5
では接点5aと接点5bとが接続されている。 In the contact 5a and the contact 5b are connected.

【0023】このような切換えスイッチ4,5の切換え状態では、狭帯域時のIF利得は、IF増幅器6の利得が、広帯域時のIF増幅器7の利得に、加算されるため、広帯域時より増加し、狭帯域時に最適な利得に設定可能となる。 [0023] In switching state of such a changeover switch 4, 5, IF gain during narrowband, since the gain of the IF amplifier 6, the gain of the IF amplifier 7 during broadband, is added, an increase from the time Wideband and, it is possible to set to the optimum gain to a narrow band at the time. 狭帯域時の受信信号は、受信ミキサー回路1から、狭帯域IFフィルタ3を経由し、IF増幅器6 Received signal at the time of narrow band from the reception mixer circuit 1, via a narrow band IF filter 3, IF amplifier 6
および7で増幅され、復調器8で復調され、受信音声またはデータへ変換される。 And is amplified by 7, it is demodulated by the demodulator 8, and is converted to a received voice or data.

【0024】 [0024]

【発明の効果】以上説明したように、本発明は、同一無線電話装置のIF帯域幅を切換えて、IF帯域幅の異なる複数のセルラー電話システムで動作させる場合、IF As described in the foregoing, the present invention switches the IF bandwidth of the same radio telephone system, when operating in different cellular telephone systems of IF bandwidth, IF
増幅器の利得を、IF帯域幅に応じて最適となるように設定できる構成のため、受信機のトータルゲイン不足に起因する、フェージング有時の受信ビットエラーレイトが劣化しない効果を有する。 The gain of the amplifier, for the configuration can be set to be optimum in accordance with the IF bandwidth, due to the total gain shortage of the receiver, has the effect of received bit error rate is not degraded when fading Yes.

【0025】また、本発明は、IF増幅器の過剰利得に起因する、強入力電界時の受信歪率の劣化を防止する利点も有する。 Further, the present invention also has the advantage of preventing the excessive due to the gain of the received distortion of the strong input electric field degradation of the IF amplifier.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の一実施例を示すブロック図である。 1 is a block diagram showing an embodiment of the present invention.

【図2】従来の無線電話装置を示すブロック図である。 2 is a block diagram showing a conventional radio telephone apparatus.

【図3】従来の無線電話装置を示すブロック図である。 3 is a block diagram showing a conventional radio telephone apparatus.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 受信ミキサー回路 2 広帯域IFフィルタ 3 狭帯域IFフィルタ 4,5 切換えスイッチ 6,7 中間周波数増幅回路(IF増幅器) 8 復調器(ディスクリミネータ) 9 IF帯域幅切換え制御信号 11 広帯域BPF 12,14 切換えスイッチ 13 狭帯域BPF 15 IFレベル検出器 16 ORゲート 17 AM検波器 18 9KHzビートレベル検出器 1 receiver mixer circuit 2 broadband IF filter 3 narrowband IF filter 4,5 changeover switches 6 and 7 intermediate frequency amplifying circuit (IF amplifier) ​​8 demodulator (discriminator) 9 IF bandwidth switching control signal 11 wideband BPF 12, 14 changeover switch 13 narrowband BPF 15 IF level detector 16 OR gate 17 AM detector 18 9 KHz beat level detector

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl. 7 ,DB名) H04B 7/24 - 7/26 H04Q 7/00 - 7/38 ────────────────────────────────────────────────── ─── of the front page continued (58) investigated the field (Int.Cl. 7, DB name) H04B 7/24 - 7/26 H04Q 7/00 - 7/38

Claims (5)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】中間周波数増幅回路を備え、受信機の中間周波数帯域幅を広帯域と狭帯域とに切換えて、 中間周波 [Claim 1 further comprising an intermediate frequency amplifier circuit, switches the intermediate frequency bandwidth of the receiver to the wideband and narrowband, intermediate frequency
    数帯域幅の異なった2つのセルラー電話システムで動作することが可能な無線電話装置において、 前記中間周波数帯域幅が狭帯域へ切換わった場合、前記中間周波数増幅回路の利得を広帯域の場合よりも増加させる手段を有し、切換えられた広帯域の中間周波数帯域 In the radio telephone device capable of operating in two different cellular telephone systems of several bandwidths, the case where the intermediate frequency bandwidth is switched to narrowband, than the gain of the intermediate frequency amplifier circuit of the broadband have a means of also increasing, the switched broadband intermediate frequency band
    幅と狭帯域の中間周波数帯域幅を別々に使用することを特徴とする無線電話装置。 Radio telephone apparatus characterized by the use of an intermediate frequency band width of the narrow-band separately.
  2. 【請求項2】 中間周波数増幅回路を備え、受信機の中間 Wherein an intermediate frequency amplifying circuit, the receiver intermediate
    周波数帯域幅を広帯域と狭帯域とに切換えて、中間周波 By switching the frequency bandwidth to a wide-band and narrow-band, intermediate frequency
    数帯域幅の異なった2つのセルラー電話システムで動作 Operating in two different cellular telephone systems of several bandwidths
    することが可能な無線電話装置において、受信信号を中間周波数に変換する受信ミキサー回路と、 前記受信ミキサー回路の出力を切換えて出力する第1の切換えスイッチと、前記第1の切換えスイッチの第1の出力端子に接続された狭帯域中間周波数フィルタと、 前記狭帯域中間周波数フィルタに接続された第1の中間周波数増幅回路と、 前記第1の切換えスイッチの第2の出力端子に接続された広帯域中間周波数フィルタと、 前記第1の中間周波数増幅回路の出力と、前記広帯域中間周波数フィルタとの出力を切換えて出力する第2の切換えスイッチと、 前記第2の切換えスイッチの出力端子に接続された第2 In the radio telephone device capable of a receiving mixer circuit for converting a received signal to an intermediate frequency, a first selector switch for outputting switching an output of the receiving mixer circuit, first the first changeover switch narrow a band intermediate frequency filter connected to an output terminal of the narrow-band intermediate frequency first intermediate frequency amplifier circuit which is connected to the filter, the first second connection wideband the output terminal of the switch an intermediate frequency filter, and an output of said first intermediate frequency amplifying circuit, a second changeover switch for outputting switching the output of the broadband intermediate frequency filter, connected to the output terminal of the second changeover switch the second
    の中間周波数増幅回路 と、前記第2の中間周波数増幅回路の出力を復調する復調回路とを備え切換えられた広帯域の中間周波数帯域幅と狭帯域の中間 Of the intermediate frequency amplifying circuit, the second and a demodulation circuit for demodulating an output of the intermediate frequency amplifying circuit, the intermediate frequency bandwidth of the switched broadband and narrowband intermediate
    周波数帯域幅を別々に使用することを特徴とする無線電話装置。 Radio telephone apparatus characterized by using a frequency bandwidth separately.
  3. 【請求項3】前記第1および第2の切換えスイッチは、 Wherein said first and second switching switches,
    中間周波数帯域幅が広帯域に指定された場合に、前記第1の切換えスイッチと前記第2の切換えスイッチとの間に、前記広帯域中間周波数フィルタが接続され、中間周波数帯域幅が狭帯域に指定された場合に、前記第1の切換えスイッチと前記第2の切換えスイッチとの間に、前記狭帯域中間周波数フィルタおよび前記第1の中間周波数増幅回路が接続されるように切換えられる、ことを特徴とする請求項2記載の無線電話装置。 When the intermediate frequency bandwidth is specified to broadband, between the said first changeover switch second changeover switch, the broadband intermediate frequency filter is connected, the intermediate frequency bandwidth is specified to narrowband If the, between the said first changeover switch second changeover switch, it is switched to the narrow-band intermediate frequency filter and the first intermediate frequency amplifier circuit is connected, and wherein the radio telephone apparatus of claim 2 wherein.
  4. 【請求項4】前記第2の中間周波数増幅回路の利得は、 Wherein the gain of said second intermediate frequency amplifier circuit,
    中間周波数帯域幅が広帯域に指定された場合に、最適となるように設定される、ことを特徴とする請求項3記載の無線電話装置。 When the intermediate frequency bandwidth is specified to broadband, is set to be optimum, the radio telephone apparatus according to claim 3, wherein a.
  5. 【請求項5】前記第1および第2の切換えスイッチの切換えは、基地局からの指示により行われる、ことを特徴とする請求項4記載の無線電話装置。 Wherein said first and switching of the second changeover switch is performed by an instruction from the base station, the radio telephone apparatus according to claim 4, wherein a.
JP08133385A 1996-05-28 1996-05-28 Wireless telephone device Expired - Fee Related JP3080879B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9270301B2 (en) 1998-11-26 2016-02-23 Nokia Technologies Oy Method and arrangement for transmitting and receiving RF signals through various radio interfaces of communication systems

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11196015A (en) 1997-12-26 1999-07-21 Alps Electric Co Ltd Receiving circuit
JP4799494B2 (en) * 2007-07-02 2011-10-26 パナソニック株式会社 Transmitter
KR101030740B1 (en) * 2010-09-07 2011-04-26 엘아이지넥스원 주식회사 Signal reciever and signal recieving method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9270301B2 (en) 1998-11-26 2016-02-23 Nokia Technologies Oy Method and arrangement for transmitting and receiving RF signals through various radio interfaces of communication systems

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