JPH0677876A - Time division multiplex transmission system - Google Patents
Time division multiplex transmission systemInfo
- Publication number
- JPH0677876A JPH0677876A JP4224202A JP22420292A JPH0677876A JP H0677876 A JPH0677876 A JP H0677876A JP 4224202 A JP4224202 A JP 4224202A JP 22420292 A JP22420292 A JP 22420292A JP H0677876 A JPH0677876 A JP H0677876A
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- JP
- Japan
- Prior art keywords
- transmission
- circuit
- channel
- reception
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、時分割多重伝送方式デ
ィジタル変調無線電話機に関し、殊に送信出力の線形性
能を補償するために改良された装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiplex transmission type digital modulation radio telephone, and more particularly to an improved device for compensating the linear performance of a transmission output.
【０００２】[0002]
【従来の技術】時分割多重伝送のディジタル変調無線電
話機においては、送信出力の非線形歪より隣接チャンネ
ルへ漏洩する電力の増大を招き、送信信号の変調精度を
劣化させ、その伝送特性に大きな影響を与える。従来、
非線形歪による伝送特性の劣化を補償する手段として図
３乃至図５に示す構成が知られている。これらの図にお
いて、３１、４１、５１は変調回路、３２、４２、５２
は線形素子並びに入出力整合素子を有した増幅回路、３
３、４３、５３は方向性結合器、３４、４４、５４は方
向性結合器で検出された変調信号（図３の場合）若しく
は送信出力（図４、５の場合）のレベルを検出する検波
回路、３４、４５は検波回路３４から得たレベル検出信
号に基づき増幅回路３２のバイアスを可変制御する直流
電圧制御回路である。また、５６は検波回路５４から得
たレベル検出信号に基づき、変調回路５１と増幅回路５
２の間に挿入した可変減衰器５７の減衰量を制御する信
号レベル制御回路である。2. Description of the Related Art In a digital modulation radio telephone of time division multiplex transmission, non-linear distortion of a transmission output causes an increase in power leaking to an adjacent channel, which deteriorates modulation accuracy of a transmission signal and has a great influence on its transmission characteristic. give. Conventionally,
The configurations shown in FIGS. 3 to 5 are known as means for compensating for the deterioration of transmission characteristics due to nonlinear distortion. In these figures, 31, 41 and 51 are modulation circuits, 32, 42 and 52.
Is an amplifier circuit having a linear element and an input / output matching element, 3
3, 43 and 53 are directional couplers, and 34, 44 and 54 are detections for detecting the level of the modulated signal (in the case of FIG. 3) or the transmission output (in the case of FIGS. 4 and 5) detected by the directional coupler. Circuits 34 and 45 are DC voltage control circuits that variably control the bias of the amplifier circuit 32 based on the level detection signal obtained from the detection circuit 34. Further, 56 is a modulation circuit 51 and an amplification circuit 5 based on the level detection signal obtained from the detection circuit 54.
2 is a signal level control circuit for controlling the amount of attenuation of the variable attenuator 57 inserted between the two.
【０００３】ところで、図３の従来技術は、変調回路３
１から出力される変調信号の振幅レベルを方向性結合器
によりレベル検出し、これに応じた制御信号を検波回路
３４で生成し、増幅回路３２のバイアスを直流電圧制御
回路３５により可変制御することで、増幅回路３２を線
形動作範囲で動作補償するものである。但し、この従来
技術では、変調信号の振幅レベルで変調出力以降の線形
動作回路を制御するといういわゆるフィードフォワード
方式の補償方法をとるため、変調器出力段以降の線形性
劣化の要因は検出できない。従って自局の送信出力の非
線形歪の状態は自局では完全には検出できない方式とな
っている。By the way, the conventional technique shown in FIG.
1. The amplitude level of the modulation signal output from 1 is detected by a directional coupler, a control signal corresponding to the detected level is generated by the detection circuit 34, and the bias of the amplification circuit 32 is variably controlled by the DC voltage control circuit 35. Thus, the operation of the amplifier circuit 32 is compensated in the linear operation range. However, in this prior art, since a so-called feed-forward type compensation method of controlling the linear operation circuit after the modulation output is controlled by the amplitude level of the modulation signal, the factor of the linearity deterioration after the modulator output stage cannot be detected. Therefore, the system is such that the state of non-linear distortion of the transmission output of the own station cannot be completely detected by the own station.
【０００４】図４、図５に示す従来構成は方向性結合器
４３、５３を送信出力端子位置に設け、その前段の増幅
回路４２のバイアス量、若しくは前々段の可変減衰器の
減衰量を制御する、いわゆるフィードバック方式をとる
ため、図３における上記した問題点を解決することがで
きる。In the conventional configuration shown in FIGS. 4 and 5, the directional couplers 43 and 53 are provided at the transmission output terminal positions, and the bias amount of the amplifier circuit 42 in the preceding stage or the attenuation amount of the variable attenuator in the preceding stage is set. Since the so-called feedback method of controlling is adopted, the above-mentioned problem in FIG. 3 can be solved.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、図３〜
図５の従来技術はいずれも自局の送信出力（若しくは変
調出力）のレベルを検出する方式であり、送信出力信号
の歪の状態を判定するものではないため、ディジタル変
調方式の無線電話機における隣接チャンネル漏洩電力を
低減する有効な手法とはいえないものである。However, as shown in FIG.
The prior art of FIG. 5 is a method for detecting the level of the transmission output (or modulation output) of its own station and does not judge the distortion state of the transmission output signal. It is not an effective method for reducing channel leakage power.
【０００６】また、いずれの従来技術とも方向性結合器
を有するため、送信出力レベルの損失を引き起こすとい
う課題ももつ。本発明はこのような課題に鑑み、方向性
結合器を用いないでも送信出力の非線形歪を防止し得
て、隣接チャンネルへの漏洩電力を有効に軽減できる極
めて有用な時分割多重伝送方式ディジタル変調無線電話
機を提供することを目的としている。Further, since any of the prior arts has a directional coupler, there is a problem that a transmission output level loss occurs. In view of the above problems, the present invention is an extremely useful time-division multiplex transmission system digital modulation that can prevent nonlinear distortion of transmission output without using a directional coupler and can effectively reduce leakage power to adjacent channels. The purpose is to provide a wireless telephone.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は時分割多重伝送方式によるディジタル変調
無線電話機において、自局の送信スロット期間の送信出
力信号を、その送信チャンネルに隣接するチャンネルで
受信するよう自局の受信回路を構成すると共に、この受
信回路で検出された信号レベルに応じて送信回路の送信
出力の大きさを制御する送信出力制御手段を備えること
を特徴としている。In order to achieve the above object, the present invention is a digital modulation radio telephone based on a time division multiplex transmission system in which a transmission output signal of a transmission slot period of its own station is a channel adjacent to the transmission channel. In addition to configuring the receiving circuit of the local station to receive at, the transmission output control means for controlling the magnitude of the transmission output of the transmission circuit according to the signal level detected by the receiving circuit is provided.
【０００８】[0008]
【作用】本発明によれば、自局の送信出力信号の線形性
能劣化に伴う隣接チャンネルへのサイドバンドスペクト
ラムの広がりを、自局の受信回路で漏洩出力レベルを検
出しこの検出信号により、送信電力増幅回路のバイアス
制御とか電力増幅回路に入力される送信信号を可変減衰
器などによる信号レベル制御することにより送信出力信
号の線形性能を補償する。According to the present invention, the spread of the sideband spectrum to the adjacent channel due to the linear performance deterioration of the transmission output signal of the own station, the leak output level is detected by the receiving circuit of the own station, and the detection signal is transmitted. The linear performance of the transmission output signal is compensated by controlling the bias of the power amplification circuit or controlling the signal level of the transmission signal input to the power amplification circuit by a variable attenuator or the like.
【０００９】[0009]
【実施例】図１は本発明の一実施例に係る時分割多重伝
送方式ディジタル変調無線電話機のブロック図を示して
いる。この無線電話機は送信部Ａと受信部Ｂに大別さ
れ、送信部Ａはディジタル変調方式で送信データを変調
する変調回路１、変調回路１から得る変調信号を高周波
局部発振回路６の発振信号と混合することにより周波数
変換する周波数変換回路２と、線形素子並びに入出力整
合素子からなる送信電力増幅回路３と、この増幅回路３
のバイアス量をコントロールする直流電圧制御回路４と
からなる。1 is a block diagram of a time-division multiplex transmission type digital modulation radio telephone according to an embodiment of the present invention. This radio telephone is roughly divided into a transmission section A and a reception section B. The transmission section A uses a modulation circuit 1 for modulating transmission data by a digital modulation method, and a modulation signal obtained from the modulation circuit 1 as an oscillation signal of a high frequency local oscillation circuit 6. A frequency conversion circuit 2 that performs frequency conversion by mixing, a transmission power amplification circuit 3 including a linear element and an input / output matching element, and this amplification circuit 3
And a DC voltage control circuit 4 for controlling the bias amount.
【００１０】前記増幅回路３で増幅された送信出力は送
受切換回路５を通じて送信出力端子から出力される。送
受切換回路５は時分割多重伝送方式により割り当てられ
た送信スロットと受信スロットに同期して送受切り換え
を行う公知の回路である。なお、この切換回路は送信ス
ロット時において送信出力の僅かな量が受信部Ｂ側に漏
洩する。The transmission output amplified by the amplification circuit 3 is output from the transmission output terminal through the transmission / reception switching circuit 5. The transmission / reception switching circuit 5 is a known circuit that switches transmission / reception in synchronization with a transmission slot and a reception slot assigned by the time division multiplex transmission system. In this switching circuit, a slight amount of transmission output leaks to the receiving section B side during the transmission slot.
【００１１】一方、受信部Ｂはいわゆるダブルスーパー
ヘテロダイン方式を採用しており、送受切換回路５から
入力される受信信号を増幅する高周波増幅回路９と、受
信信号と高周波局部発振回路６の発振する信号とを混合
し、両者の周波数の差の周波数の信号を第１中間周波信
号として出力する第１周波数変換回路１０と、第１中間
周波信号を増幅する第１中間周波増幅回路１１と、第１
中間周波信号と中間周波局部発振回路７の発振する信号
とを混合し、両者の差の周波数の信号を第２中間周波信
号として出力する第２周波数変換回路１６と、第２中間
周波信号を選択的に通過する中間周波フィルタ１２と、
このフィルタ１２を通過した信号を増幅する第２中間周
波増幅回路１４と、第２中間周波信号をディジタル復調
する復調回路１５と、第２中間周波信号のレベルを検出
する受信信号レベル検出回路１３とからなる。On the other hand, the receiver B adopts a so-called double superheterodyne system, and a high frequency amplifier circuit 9 for amplifying a received signal inputted from the transmission / reception switching circuit 5, and the received signal and the high frequency local oscillation circuit 6 oscillate. A first frequency conversion circuit 10 for mixing a signal and outputting a signal having a frequency difference between the two as a first intermediate frequency signal; a first intermediate frequency amplification circuit 11 for amplifying the first intermediate frequency signal; 1
A second frequency conversion circuit 16 that mixes the intermediate frequency signal and the signal oscillated by the intermediate frequency local oscillation circuit 7 and outputs a signal having a frequency difference between the two as a second intermediate frequency signal, and selects the second intermediate frequency signal. The intermediate frequency filter 12 passing through
A second intermediate frequency amplifier circuit 14 that amplifies the signal that has passed through the filter 12, a demodulation circuit 15 that digitally demodulates the second intermediate frequency signal, and a received signal level detection circuit 13 that detects the level of the second intermediate frequency signal. Consists of.
【００１２】前記受信信号レベル検出回路１３から出力
される受信信号レベルは直流電圧制御回路４に入力さ
れ、送信出力増幅回路３のバイアス量を制御するように
されている。前記受信部Ｂは、受信スロット期間におけ
る受信チャンネルは自局の送信部Ａの送信周波数と同じ
周波数チャンネルに設定されるが、送信スロット期間は
送信チャンネルに隣接するチャンネルに変更される。こ
の変更を行うのが選局回路８であり、本実施例において
は、この選局回路８が中間周波局部発振回路７の発振周
波数を受信スロット時と送信スロット時とで１チャンネ
ル分（Δｆ）ズラしている。なお、局部発振周波数をΔ
ｆだけズラすことは、局部発振回路７にＰＬＬ回路を用
い、そのＶＣＯの入力電圧を選局回路８によって制御す
ることにより実施できる。The received signal level output from the received signal level detection circuit 13 is input to the DC voltage control circuit 4 so as to control the bias amount of the transmission output amplification circuit 3. In the receiving unit B, the receiving channel in the receiving slot period is set to the same frequency channel as the transmitting frequency of the transmitting unit A of its own station, but the transmitting slot period is changed to a channel adjacent to the transmitting channel. This change is made by the tuning circuit 8. In this embodiment, the tuning circuit 8 changes the oscillation frequency of the intermediate frequency local oscillation circuit 7 for one channel (Δf) between the reception slot and the transmission slot. I am fooling. Note that the local oscillation frequency is Δ
The shift by f can be performed by using a PLL circuit as the local oscillation circuit 7 and controlling the input voltage of the VCO by the tuning circuit 8.
【００１３】次に、上記構成の動作を説明する。一般に
知られている時分割多重伝送方式の無線機において、送
信スロット時は自局の受信部Ｂが非作動となっている
が、本実施例では、自局の送信スロット時において受信
部Ｂが作動状態となっている。しかも、この場合、中間
周波局部発振回路７の発振周波数が受信スロット時にお
けるそれよりもΔｆだけズレているため、送信スロット
時に送受切換回路５を通じて受信部Ｂで受信された送信
信号は、第２中間周波まで周波数変換されたとき、図２
−１に示すように送信チャンネルの中心周波数に相当す
る周波数ｆ’ＩＦ２が、正規の第２中間周波数ｆＩＦ２
よりもΔｆだけズレた波形となる。Next, the operation of the above configuration will be described. In a generally known time-division multiplex transmission wireless device, the receiving unit B of its own station is inactive during the transmission slot. However, in the present embodiment, the receiving unit B of the own station is in the transmission slot of the own station. It is operating. Moreover, in this case, since the oscillation frequency of the intermediate frequency local oscillation circuit 7 is shifted by Δf from that at the reception slot, the transmission signal received by the reception section B through the transmission / reception switching circuit 5 at the transmission slot is the second signal. When the frequency is converted to the intermediate frequency,
−1, the frequency f′IF2 corresponding to the center frequency of the transmission channel is the regular second intermediate frequency fIF2.
The waveform has a difference of Δf.
【００１４】一方、中間周波フィルタ１２の周波数特性
は図２−２に示すように正規の中間周波数ｆＩＦ２を中
心周波数にもった帯域特性をもっているので、送信スロ
ット時においてこの中間周波フィルタ１２を通じて得る
信号は図２−３に示すような周波数特性をもつ。ここ
で、周波数ｆｂは送信信号の中心周波数に相当する周波
数ｆ’ＩＦからΔｆズレた隣接チャンネルへの漏洩成分
の周波数である。従って、自局の送信信号の線形性能が
劣化し、図２−１に破線で示すように隣接チャンネルへ
の漏洩成分が増大すると、中間周波フィルタ１２を通じ
て検出される信号も図２−３に破線で示す通り増大す
る。この増大量は隣接チャンネルへの漏洩成分の増大と
比例関係にあるので、これを受信信号レベル検出回路１
３で検出し、その検出レベルを直流電圧制御回路４に制
御入力として加えることにより、送信出力を正しく非線
形歪を生じないよう制御することができる。On the other hand, since the frequency characteristic of the intermediate frequency filter 12 has a band characteristic in which the normal intermediate frequency fIF2 is also the center frequency as shown in FIG. 2B, the signal obtained through this intermediate frequency filter 12 during the transmission slot. Has a frequency characteristic as shown in FIG. Here, the frequency fb is the frequency of the leakage component to the adjacent channel that is Δf shifted from the frequency f′IF corresponding to the center frequency of the transmission signal. Therefore, when the linear performance of the transmission signal of the own station deteriorates and the leakage component to the adjacent channel increases as shown by the broken line in FIG. 2A, the signal detected through the intermediate frequency filter 12 also has a broken line in FIG. It increases as shown in. This amount of increase is in proportion to the increase of the leakage component to the adjacent channel, and therefore, this is determined by the received signal level detection circuit 1
3 and the detection level is applied to the DC voltage control circuit 4 as a control input, so that the transmission output can be correctly controlled so as not to cause nonlinear distortion.
【００１５】なお、線形性能の制御手段としては、上記
実施例のように直流電圧制御回路４を用いる代わりに、
受信信号レベル検出回路１３により生成された線形性能
制御信号で増幅回路３に入力される信号レベルをその前
段に配置する可変減衰器を制御し、線形性能制御信号の
信号レベルに応じて減衰量を可変することで送信電力増
幅回路３の出力信号の線形性能を任意の一定の値に保つ
ことも出来る。As the linear performance control means, instead of using the DC voltage control circuit 4 as in the above embodiment,
The linear performance control signal generated by the reception signal level detection circuit 13 controls a variable attenuator that arranges the signal level input to the amplification circuit 3 in the preceding stage, and controls the attenuation amount according to the signal level of the linear performance control signal. By varying, the linear performance of the output signal of the transmission power amplifier circuit 3 can be maintained at an arbitrary constant value.
【００１６】また、送信チャンネルに隣接するチャンネ
ルへの漏洩電力を検出する構成も、実施例のように中間
周波局部発振回路７の発振周波数をΔｆ変化させる代わ
りに中間周波フィルタ１２として正規の中間周波のもの
とΔｆズラしたものとを用意しておき、これをスロット
の切り換えに同期してスイッチで切り換えるという構成
とすることもできる。Also, in the configuration for detecting the leakage power to the channel adjacent to the transmission channel, instead of changing the oscillation frequency of the intermediate frequency local oscillation circuit 7 by Δf as in the embodiment, the intermediate frequency filter 12 has a regular intermediate frequency. It is also possible to have a configuration in which ones and those shifted by Δf are prepared and these are switched by a switch in synchronization with the switching of the slots.
【００１７】[0017]
【発明の効果】以上説明したように本発明によれば、送
信チャンネルに隣接するチャンネルへの漏洩電力を検出
する構成であるので、従来のに比べて正確に歪部分のみ
を検出することができ、ディジタル変調方式無線電話機
にとって頗る有効に線形性能を補償することができる。As described above, according to the present invention, since the leakage power to the channel adjacent to the transmission channel is detected, only the distorted portion can be detected more accurately than in the conventional case. , It is possible to effectively compensate the linear performance for a digital modulation type wireless telephone.
【００１８】加えて、送信信号の線形性能を検出する手
段として、自局の受信回路を使用し検出するため、従来
のように専用の回路を必要とせず、部品点数並びに回路
実装面積の増大がないものである。その上、送信回路に
方向性結合器を挿入するものでなく、単に既存の受信回
路を利用し、送信回路から受信回路へ漏洩する信号によ
って線形性能の検出を行う事ができるので、送信出力レ
ベルの損失を招くことがない。In addition, since the receiving circuit of the own station is used as a means for detecting the linear performance of the transmitted signal, a dedicated circuit is not required as in the conventional case, and the number of parts and the circuit mounting area are increased. There is no such thing. In addition, the directional coupler is not inserted in the transmission circuit, the linear performance can be detected by simply using the existing reception circuit and detecting the signal leaking from the transmission circuit to the reception circuit. Will not cause a loss.
【図１】本発明にかかる時分割多重伝送方式ディジタル
変調無線電話機の回路構成を示すブロック図である。FIG. 1 is a block diagram showing a circuit configuration of a time division multiplex transmission system digital modulation radio telephone according to the present invention.
【図２】図１の無線機における受信回路において、送信
出力の歪部分を検出する際の信号スペクトラムの状態を
示すグラフである。FIG. 2 is a graph showing a state of a signal spectrum when detecting a distorted portion of a transmission output in the receiving circuit in the wireless device of FIG.
【図３】従来の無線電話機における送信出力の非線形歪
による伝送特性の劣化を補償する回路構成を示すブロッ
ク図である。FIG. 3 is a block diagram showing a circuit configuration for compensating for deterioration of transmission characteristics due to nonlinear distortion of transmission output in a conventional wireless telephone.
【図４】従来の無線電話機における送信出力の非線形歪
による伝送特性の劣化を補償する回路構成を示すブロッ
ク図である。FIG. 4 is a block diagram showing a circuit configuration for compensating for deterioration of transmission characteristics due to nonlinear distortion of transmission output in a conventional wireless telephone.
【図５】従来の無線電話機における送信出力の非線形歪
による伝送特性の劣化を補償する回路構成を示すブロッ
ク図である。FIG. 5 is a block diagram showing a circuit configuration for compensating for deterioration of transmission characteristics due to nonlinear distortion of transmission output in a conventional wireless telephone.
１ 変調回路 ２ 周波数変換回路 ３ 送信電力増進回路 ４ 直流電圧制御回路 ７ 中間周波局部発振回路 １０ 第１周波数変換回路 １１ 第１中間周波数増幅回路 １２ 中間周波数フィルタ １３ 受信信号レベル検出回路 １４ 第２中間周波数変換回路 １６ 第２中間周波数増幅回路 DESCRIPTION OF SYMBOLS 1 modulation circuit 2 frequency conversion circuit 3 transmission power enhancement circuit 4 DC voltage control circuit 7 intermediate frequency local oscillation circuit 10 1st frequency conversion circuit 11 1st intermediate frequency amplification circuit 12 intermediate frequency filter 13 received signal level detection circuit 14 2nd intermediate Frequency conversion circuit 16 Second intermediate frequency amplification circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｊ 3/00 Ｊ 8843−5Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location H04J 3/00 J 8843-5K
Claims (1)
調無線電話機において、 自局の送信スロット期間の送信出力信号を、その送信チ
ャンネルに隣接するチャンネルで受信するよう自局の受
信回路を構成すると共に、この受信回路で検出された信
号レベルに応じて送信回路の送信出力の大きさを制御す
る送信出力制御手段を備えることを特徴とする時分割多
重伝送方式ディジタル変調無線電話機。1. In a digitally modulated radio telephone according to a time division multiplex transmission system, a receiving circuit of its own station is configured to receive a transmission output signal of its own transmission slot period in a channel adjacent to the transmission channel, A time-division multiplex transmission type digital modulation radio telephone comprising a transmission output control means for controlling the magnitude of the transmission output of the transmission circuit according to the signal level detected by the reception circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4224202A JP3048760B2 (en) | 1992-08-24 | 1992-08-24 | Time-division multiplexing digital modulation radio telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4224202A JP3048760B2 (en) | 1992-08-24 | 1992-08-24 | Time-division multiplexing digital modulation radio telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0677876A true JPH0677876A (en) | 1994-03-18 |
| JP3048760B2 JP3048760B2 (en) | 2000-06-05 |
Family
ID=16810130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4224202A Expired - Fee Related JP3048760B2 (en) | 1992-08-24 | 1992-08-24 | Time-division multiplexing digital modulation radio telephone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3048760B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7496063B2 (en) | 2000-06-14 | 2009-02-24 | Matsushita Electric Industrial Co., Ltd. | Time division multiplexing radio system for controlling transmission power |
| JP2013143637A (en) * | 2012-01-10 | 2013-07-22 | Ntt Docomo Inc | Transmission/reception sharing radio circuit and reception signal amplification method |
-
1992
- 1992-08-24 JP JP4224202A patent/JP3048760B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7496063B2 (en) | 2000-06-14 | 2009-02-24 | Matsushita Electric Industrial Co., Ltd. | Time division multiplexing radio system for controlling transmission power |
| JP2013143637A (en) * | 2012-01-10 | 2013-07-22 | Ntt Docomo Inc | Transmission/reception sharing radio circuit and reception signal amplification method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3048760B2 (en) | 2000-06-05 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |