JPH04372233A - Radio telephone system - Google Patents
Radio telephone systemInfo
- Publication number
- JPH04372233A JPH04372233A JP3148937A JP14893791A JPH04372233A JP H04372233 A JPH04372233 A JP H04372233A JP 3148937 A JP3148937 A JP 3148937A JP 14893791 A JP14893791 A JP 14893791A JP H04372233 A JPH04372233 A JP H04372233A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- reception
- transmission
- radio
- local oscillation
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000010355 oscillation Effects 0.000 claims description 31
- 238000010586 diagram Methods 0.000 description 6
- 230000002452 interceptive effect Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、時分割デュプレックス
方式の無線電話装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-division duplex wireless telephone apparatus.
【０００２】0002
【従来の技術】送受信を同一周波数無線チャネルで時分
割通信を行う、時分割デュプレックス（ＴＤＤ：Ｔｉｍ
ｅ Ｄｉｖｉｓｉｏｎ Ｄｕｐｌｅｘ 以下「ＴＤＤ
」という。）通信方式が知られている。[Prior Art] Time division duplex (TDD: Tim
e Division Duplex (hereinafter referred to as “TDD”)
”. ) communication method is known.
【０００３】図３は、このようなＴＤＤ方式による無線
電話装置の従来の無線回路構成を示すブロック図である
。FIG. 3 is a block diagram showing a conventional radio circuit configuration of such a TDD type radio telephone device.
【０００４】まず、送信時は信号入力端子１４から入力
信号が入力される。入力された信号は変調部７により変
調され、送信中間周波数ｆｉを生成する。送信時はスイ
ッチ５、８はＯＮで導通状態になっているため、周波数
シンセサイザ９より発生している送受共用局部発振周波
数ｆｃは、送信局部発振周波数ｆｃとして送信ミキサ６
に入力される。送信ミキサ６では、変調部７から出力さ
れた送信中間周波数ｆｉと送信局部発振周波数ｆｃとが
混合され無線送信周波数ｆｏに変換される。ｆｏはＯＮ
になっているスイッチ５を通り、増幅器４により増幅さ
れる。このとき、スイッチ５およびスイッチ８のＯＮと
同時にスイッチ３も送信側に倒れているため、ｆｏはス
イッチ３、ＲＦフィルタ２を通り、アンテナ１から無線
電波として送信される。なお、スイッチ３は送信側に倒
れているため、受信することはできない。First, during transmission, an input signal is input from the signal input terminal 14. The input signal is modulated by the modulator 7 to generate a transmission intermediate frequency fi. During transmission, the switches 5 and 8 are ON and conductive, so the local oscillation frequency fc for both transmission and reception generated by the frequency synthesizer 9 is transmitted to the transmission mixer 6 as the transmission local oscillation frequency fc.
is input. In the transmission mixer 6, the transmission intermediate frequency fi output from the modulation section 7 and the transmission local oscillation frequency fc are mixed and converted into a radio transmission frequency fo. fo is ON
The signal passes through switch 5, which is set to , and is amplified by amplifier 4. At this time, since the switch 3 is turned to the transmitting side at the same time as the switches 5 and 8 are turned on, fo passes through the switch 3 and the RF filter 2 and is transmitted from the antenna 1 as a radio wave. Note that since the switch 3 is tilted toward the transmitting side, it is not possible to receive.
【０００５】一方、受信時、スイッチ３が受信側に倒れ
ているため、無線送信周波数ｆｏと同一である無線受信
周波数ｆｏはアンテナ１及びＲＦフィルタ２を介して、
スイッチ３を通り、増幅器１０に入力される。増幅器１
０に入力された無線受信周波数ｆｏは増幅され、受信ミ
キサ１１に入力される。一方、周波数シンセサイザ９は
送受信共用の局部発振周波数ｆｃを常に発生しており、
送受共用局部発振周波数ｆｃは受信用局部発振周波数ｆ
ｃとして受信ミキサ１１に入力される。受信ミキサ１１
では受信用局部発振周波数ｆｃと無線受信周波数ｆｏが
混合され、受信中間周波数ｆｉを生成する。受信中間周
波数ｆｉはフィルタ１２を通り、復調部１３により復調
され出力信号として信号出力端子１５から端末へ出力さ
れる。On the other hand, during reception, since the switch 3 is turned to the receiving side, the radio reception frequency fo, which is the same as the radio transmission frequency fo, is transmitted through the antenna 1 and the RF filter 2.
The signal passes through switch 3 and is input to amplifier 10 . amplifier 1
The radio reception frequency fo input to 0 is amplified and input to the reception mixer 11. On the other hand, the frequency synthesizer 9 always generates a local oscillation frequency fc for both transmission and reception.
The local oscillation frequency fc for both transmission and reception is the local oscillation frequency f for reception.
It is input to the reception mixer 11 as c. Receive mixer 11
Then, the reception local oscillation frequency fc and the radio reception frequency fo are mixed to generate the reception intermediate frequency fi. The received intermediate frequency fi passes through the filter 12, is demodulated by the demodulator 13, and is output as an output signal from the signal output terminal 15 to the terminal.
【０００６】ところで、ＴＤＤ方式は送信無線周波数ｆ
ｏと受信無線周波数ｆｏが同一であるため、受信時に、
送信部が生成する妨害波が受信部に回り込んで妨害を与
え、受信品質を劣化させるという問題がある。すなわち
、受信時、無変調送信中間周波数ｆｉと常時出力される
局部発振周波数ｆｃが送信ミキサ６により混合され、さ
らに増幅器４により増幅され送信無線周波数ｆｏを生成
し、生成妨害周波数ｆｏは希望波である受信無線周波数
ｆｏのレベルと同等以上のレベルをもつ妨害波となる。
このため、上記従来例はスイッチ８を設けて受信時に局
部発振周波数ｆｏが送信ミキサ６に入力し妨害波が生成
されないように、また、スイッチ５を設けて送信ミキサ
６で生成されてしまった生成妨害周波数ｆｏが増幅器４
で増幅されないようにしている。By the way, in the TDD system, the transmission radio frequency f
Since o and the receiving radio frequency fo are the same, at the time of reception,
There is a problem in that the interference waves generated by the transmitter enter the receiver and cause interference, degrading the reception quality. That is, during reception, the unmodulated transmission intermediate frequency fi and the constantly output local oscillation frequency fc are mixed by the transmission mixer 6, and further amplified by the amplifier 4 to generate the transmission radio frequency fo, and the generated interference frequency fo is the desired wave. This becomes an interference wave having a level equal to or higher than that of a certain received radio frequency fo. For this reason, in the above conventional example, a switch 8 is provided to prevent the local oscillation frequency fo from being input to the transmitting mixer 6 during reception and generating interference waves, and a switch 5 is provided to prevent the generation of interference waves by inputting the local oscillation frequency fo to the transmitting mixer 6 during reception. The interference frequency fo is the amplifier 4
to prevent it from being amplified.
【０００７】しかし、送信出力が１０ｍＷ以上の場合、
受信品質を良好に保つためには、希望波の無線周波数レ
ベルが受信時の漏れ妨害無線周波数のレベルにより影響
を受けない最低限の信号対妨害比を確保するため、送信
ＯＮ／ＯＦＦ比で１００ｄＢ以上とる必要がある。この
場合、上記従来例のように、スイッチ３の切換による漏
れ防止効果を含め、スイッチ５およびスイッチ８による
無変調送信波の漏れレベルを少なくとも希望波である受
信無線周波数ｆｏに影響を与えない信号対妨害比を満足
するレベル以下に防ぐ従来の方法を使うと、スイッチ５
およびスイッチ８の段数を多くしなくてはならず、最終
的にスイッチの数が多くならざるを得ない。However, when the transmission output is 10 mW or more,
In order to maintain good reception quality, the transmission ON/OFF ratio must be 100 dB to ensure a minimum signal-to-interference ratio in which the radio frequency level of the desired wave is not affected by the level of the leakage interfering radio frequency during reception. It is necessary to take more than that. In this case, as in the above-mentioned conventional example, the leakage level of the unmodulated transmission wave by the switch 5 and the switch 8, including the leakage prevention effect by switching the switch 3, is changed to a signal that does not affect at least the received radio frequency fo, which is the desired wave. Using the conventional method of preventing the interference ratio below a satisfactory level, switch 5
Also, the number of stages of switches 8 must be increased, and the number of switches must ultimately increase.
【０００８】従って、移動局における携帯機器の場合、
移動性を考慮した軽量・小型化が困難になるという問題
点がある。[0008] Therefore, in the case of a mobile device at a mobile station,
There is a problem in that it is difficult to reduce the size and weight in consideration of mobility.
【０００９】[0009]
【発明が解決しようとする課題】上述したように、送信
出力が１０ｍＷ以上の場合、受信機の通信品質劣化防止
のため、受信時の送信部から受信部への妨害送信周波数
の漏れレベルを−１００ｄＢ以下に抑える電磁干渉対策
が必要であり、携帯機器において、従来の方法で良好な
品質を維持することは困難である。[Problems to be Solved by the Invention] As mentioned above, when the transmission output is 10 mW or more, in order to prevent deterioration of the communication quality of the receiver, it is necessary to reduce the leakage level of the interfering transmission frequency from the transmitter to the receiver during reception. It is necessary to take measures against electromagnetic interference to suppress it to 100 dB or less, and it is difficult to maintain good quality in portable devices using conventional methods.
【００１０】そこで、本発明は、上記問題点を解決する
ため、比較的簡易な方法により、送信出力が１０ｍＷ以
上である移動局の携帯機器においても受信機の通信品質
を劣化させることのないＴＤＤ方式の無線電話装置を提
供することを目的とするものである。SUMMARY OF THE INVENTION Therefore, in order to solve the above-mentioned problems, the present invention provides a TDD that does not deteriorate the communication quality of a receiver even in a mobile device of a mobile station with a transmission output of 10 mW or more using a relatively simple method. The purpose of this invention is to provide a wireless telephone device based on the above-mentioned method.
【００１１】[0011]
【課題を解決するための手段】送受信を同一周波数無線
チャネルで時分割通信を行う時分割デュプレックス方式
を使用する無線電話装置において、送受同一無線周波数
とすべく異なる送受信用局部発振波を切り換えて発生す
る一つの周波数シンセサイザを具備したことを特徴とす
る。[Means for solving the problem] In a radio telephone device that uses a time division duplex method in which time division communication is performed using the same frequency radio channel for transmission and reception, different local oscillation waves for transmission and reception are generated by switching to make the transmission and reception the same radio frequency. The present invention is characterized in that it is equipped with one frequency synthesizer that performs the following functions.
【００１２】0012
【作用】本発明は、予め、送受信中間周波数に一定の周
波数差を設け、同一の送受信無線周波数となるように、
送受信時、中間周波数差に対応した異なる送受信局部発
振波を同一のシンセサイザの切換により生成しているた
め、受信時に、送信側から漏れ妨害波があっても、受信
時の局部発振周波数により生成した漏れ妨害周波数は、
受信無線周波数と異なるため、受信機への妨害とはなら
ず、受信品質の劣化を防止することができる。[Operation] The present invention provides a certain frequency difference in the transmitting and receiving intermediate frequencies in advance so that the transmitting and receiving radio frequencies are the same.
When transmitting and receiving, different transmitting and receiving local oscillation waves corresponding to the intermediate frequency difference are generated by switching the same synthesizer, so even if there is a leakage interference wave from the transmitting side during reception, it will not be generated using the local oscillation frequency during reception. The leakage disturbance frequency is
Since it is different from the reception radio frequency, it does not interfere with the receiver and can prevent deterioration of reception quality.
【００１３】[0013]
【実施例】以下、図面を参照して本発明の一実施例を説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１４】図１は、本発明による無線電話装置の一実
施例を示すブロック図である。なお、図１において、図
３の従来例との比較を容易にするため、同一の符号を使
用している。FIG. 1 is a block diagram showing an embodiment of a wireless telephone device according to the present invention. Note that in FIG. 1, the same reference numerals are used to facilitate comparison with the conventional example shown in FIG.
【００１５】まず、無線機の送受信動作について説明す
る。First, the transmitting and receiving operations of the radio will be explained.
【００１６】送信時は信号入力端子１４から入力信号が
入力され、変調部７へ入力される。変調部７において、
送信中間周波数（ｆｉ＋１０Δｆ）が生成される。ここ
で、生成した送信中間周波数は、受信中間周波数に比べ
て無線電話割当使用チャネル周波数間隔Δｆの１０倍高
い周波数である。変調部７から出力された送信中間周波
数（ｆｉ＋１０Δｆ）は、送信ミキサ６において周波数
シンセサイザ９より送信時のみ送出される送信局部発振
周波数（ｆｃ−１０Δｆ）と混合され、無線送信周波数
ｆｏが生成される。ここで、周波数シンセサイザ９から
発生する送信局部発振周波数をｆｃ−１０Δｆとしたの
は、同一の送受信無線周波数とすべく、シフトさせた１
０倍のチャネル間隔１０Δｆを相殺するためである。な
お、ｆｃは受信局部発振周波数と同じ周波数を意味する
。さて、送信ミキサ６で生成された無線送信周波数ｆｏ
は、増幅器４で増幅され、送信時は送信側に倒れている
スイッチ３を通り、ＲＦフィルタ２、アンテナ１を介し
て、無線電波として送出される。During transmission, an input signal is input from the signal input terminal 14 and is input to the modulation section 7. In the modulation section 7,
A transmit intermediate frequency (fi+10Δf) is generated. Here, the generated transmission intermediate frequency is a frequency that is 10 times higher than the radio telephone allocated channel frequency interval Δf compared to the reception intermediate frequency. The transmission intermediate frequency (fi + 10Δf) outputted from the modulation section 7 is mixed in the transmission mixer 6 with the transmission local oscillation frequency (fc - 10Δf), which is sent out only during transmission from the frequency synthesizer 9, to generate a radio transmission frequency fo. . Here, the reason why the transmitting local oscillation frequency generated from the frequency synthesizer 9 is fc-10Δf is that it is shifted by 1 to make the transmitting and receiving radio frequency the same.
This is to cancel the 0 times channel spacing 10Δf. Note that fc means the same frequency as the receiving local oscillation frequency. Now, the radio transmission frequency fo generated by the transmission mixer 6
is amplified by an amplifier 4, and at the time of transmission, it passes through a switch 3 that is turned toward the transmission side, and is sent out as a radio wave via an RF filter 2 and an antenna 1.
【００１７】次に受信時の動作について説明する。無線
送信周波数と同一である無線受信周波数ｆｏは、アンテ
ナ１、ＲＦフィルタ２を通り、受信時は受信側に倒れて
いるスイッチ３を通り、増幅器１０を介して、受信ミキ
サ１１に入力される。受信ミキサ１１において、入力さ
れた無線受信周波数ｆｏは周波数シンセサイザ９より受
信時のみ出力される受信局部発振周波数ｆｃと混合され
受信中間周波数ｆｉに変換される。変換された受信中間
周波数ｆｉはＩＦフィルタ１２を通り、復調部１３にお
いて復調され、信号出力端子１５から出力信号として出
力される。Next, the operation at the time of reception will be explained. A radio reception frequency fo, which is the same as the radio transmission frequency, passes through an antenna 1, an RF filter 2, a switch 3 that is turned toward the reception side during reception, and is input to a reception mixer 11 via an amplifier 10. In the reception mixer 11, the input radio reception frequency fo is mixed with the reception local oscillation frequency fc outputted from the frequency synthesizer 9 only during reception, and converted into a reception intermediate frequency fi. The converted reception intermediate frequency fi passes through the IF filter 12, is demodulated in the demodulation section 13, and is outputted from the signal output terminal 15 as an output signal.
【００１８】以上のように、本実施例は周波数シンセサ
イザ９の発生する局部発振周波数が送信時と受信時で１
０倍のチャネル間隔分であるΔｆ分だけ異なる周波数を
切り換えて発生するため、受信時に送信側から漏れる妨
害周波数は、受信局部発振周波数ｆｃと送信中間周波数
（ｆｉ＋１０Δｆ）の送信ミキサ６による混合で発生す
る妨害周波数（ｆｏ＋１０Δｆ）である。従って、希望
波である受信無線周波数ｆｏと送信部からの妨害周波数
（ｆｏ＋１０Δｆ）は異なるため、受信無線周波数ｆｏ
は妨害の影響を受けずに受信することができる。また、
送信部からの妨害周波数（ｆｏ＋１０Δｆ）が受信ミキ
サ１１で生成される中間周波数は（ｆｉ＋１０Δｆ）で
あるが、この妨害中間周波数はＩＦフィルタ１２の周波
数通過帯域を制限することによりカットされ、希望波の
受信中間周波数ｆｉのみが有効となり、復調部１３に入
力され復調される。As described above, in this embodiment, the local oscillation frequency generated by the frequency synthesizer 9 is 1 during transmission and during reception.
The interference frequency that leaks from the transmitting side during reception is generated by mixing the receiving local oscillation frequency fc and the transmitting intermediate frequency (fi + 10Δf) by the transmitting mixer 6, since it is generated by switching frequencies that differ by Δf, which is the 0 times channel interval. This is the interference frequency (fo+10Δf). Therefore, since the received radio frequency fo, which is the desired wave, and the interference frequency (fo+10Δf) from the transmitter are different, the received radio frequency fo
can be received without being affected by interference. Also,
The intermediate frequency at which the interfering frequency (fo+10Δf) from the transmitter is generated by the receiving mixer 11 is (fi+10Δf), but this interfering intermediate frequency is cut by limiting the frequency passband of the IF filter 12, and the desired wave is Only the reception intermediate frequency fi becomes valid and is input to the demodulator 13 and demodulated.
【００１９】また、前述したように同一の送受信無線周
波数とするため、周波数シンセサイザの発生する送信局
部発振周波数の切換周波数差に対応して送信中間周波数
も周波数幅１０Δｆだけシフトしている。従来例では送
受中間周波数は同じであったが、本実施例においては、
送受信中間周波数は異なる。Furthermore, as described above, in order to use the same transmitting and receiving radio frequency, the transmitting intermediate frequency is also shifted by a frequency width of 10Δf corresponding to the switching frequency difference of the transmitting local oscillation frequency generated by the frequency synthesizer. In the conventional example, the transmitting and receiving intermediate frequencies were the same, but in this example,
The transmitting and receiving intermediate frequencies are different.
【００２０】ここで、局部発振周波数の時間的変化につ
いて図２を参照して説明する。図２は、ＴＤＤ／ＴＤＭ
Ａ４多重通信の第３スロットを使用した移動局における
従来例と一実施例の送受信局部発振周波数の時間変化に
対する比較図である。図２において、実施例（ａ）及び
従来例（ｂ）とも横軸は時間であり、縦軸は送受信局部
発振周波数である。また、図２で示しているのは移動局
側の例であり、ＴＤＭＡ４多重のタイムスロットの第３
スロットを使用している例である。受信時の第３スロッ
トＲ３では実施例（ａ）及び従来例（ｂ）ともに、受信
局部発振周波数はｆｃで同じであるが、送信時の第３ス
ロットＴ３において、従来例（ｂ）では送信局部発振周
波数はｆｃで受信時と同一であるのに対し、本実施例（
ａ）では送信局部発振周波数は（ｆｉ−１０Δｆ）とな
り、１０倍のチャネル周波数間隔である１０Δｆ分だけ
低い局部発振周波数となっている。従って、同一の送受
無線周波数のもとでは、上述したように、周波数シンセ
サイザが送受切換周波数幅をもつことにより希望波を正
常に受信できる。[0020] Here, temporal changes in the local oscillation frequency will be explained with reference to FIG. Figure 2 shows TDD/TDM
FIG. 6 is a comparison diagram of temporal changes in transmitting/receiving local oscillation frequencies of a conventional example and an embodiment of a mobile station using the third slot of A4 multiplex communication. In FIG. 2, in both the embodiment (a) and the conventional example (b), the horizontal axis is time, and the vertical axis is the transmitting/receiving local oscillation frequency. Moreover, what is shown in FIG. 2 is an example on the mobile station side, where the third time slot of the TDMA4 multiplexed time slot is
This is an example using slots. In the third slot R3 during reception, the receiving local oscillation frequency is fc in both the embodiment (a) and the conventional example (b), but in the third slot T3 during transmission, the transmitting local oscillation frequency in the conventional example (b) The oscillation frequency is fc and is the same as that during reception, whereas in this example (
In a), the transmission local oscillation frequency is (fi-10Δf), which is a local oscillation frequency lower by 10Δf, which is 10 times the channel frequency interval. Therefore, under the same transmitting/receiving radio frequency, the frequency synthesizer has the transmitting/receiving switching frequency width, as described above, so that the desired wave can be normally received.
【００２１】ところで、本発明の通信方式ではシンセサ
イザの高速切換が要求されるが、通常、ＴＤＭＡ（時分
割多元接続）のシステム、特にゾ−ン方式では空チャネ
ル検出、干渉検出のためシンセサイザの高速切換が要求
されており、チャネル切換時間として基本フレ−ム周期
の約１／１０となっている。このようなシンセサイザに
おいては送受信で周波数を１０チャネル程度切り換える
ことは容易である。By the way, the communication method of the present invention requires high-speed switching of the synthesizer, but normally, in a TDMA (time division multiple access) system, especially a zone method, the high-speed switching of the synthesizer is required for empty channel detection and interference detection. Switching is required, and the channel switching time is about 1/10 of the basic frame period. In such a synthesizer, it is easy to switch frequencies for transmission and reception by about 10 channels.
【００２２】また、本実施例では周波数シンセサイザの
周波数切換幅をチャネル間隔Δｆの１０倍である１０Δ
ｆとしたが、チャネル間隔Δｆの任意の整数倍とするこ
とも周波数シンセサイザの切換能力により可能となる。
また、周波数シンセサイザの周波数切換幅を任意の間隔
に拡げることも、また狭くすることも可能である。In this embodiment, the frequency switching width of the frequency synthesizer is set to 10Δ which is 10 times the channel spacing Δf.
Although it is set to f, it is also possible to set it to any integral multiple of the channel spacing Δf, depending on the switching ability of the frequency synthesizer. Furthermore, it is possible to widen or narrow the frequency switching width of the frequency synthesizer to an arbitrary interval.
【００２３】[0023]
【発明の効果】以上説明したように、ＴＤＤ方式の無線
電話装置において、送受信時に異なる送受信局部発振波
を同一シンセサイザにより生成するため、送信出力１０
ｍＷ以上の時でも、受信時の送信部からの漏れ妨害送信
周波数が異なるため電磁干渉が全く問題とならず、通信
品質の劣化を防止できる。さらに、妨害送信波の漏れ防
止のための膨大なスイッチが不要でかつ周波数シンセサ
イザも従来通り一つであるため回路構成が簡略化でき、
移動局携帯機器の軽量・小型化が可能となる。Effects of the Invention As explained above, in a TDD wireless telephone device, different transmitting and receiving local oscillation waves are generated by the same synthesizer during transmission and reception, so that the transmission output is 10.
Even when the power is more than mW, electromagnetic interference does not pose a problem at all because the transmission frequencies are different due to leakage interference from the transmitter during reception, and deterioration of communication quality can be prevented. Furthermore, there is no need for a large number of switches to prevent leakage of transmitted interference waves, and there is only one frequency synthesizer, as before, which simplifies the circuit configuration.
It becomes possible to reduce the weight and size of mobile station portable equipment.
【図１】本発明による無線電話装置の一実施例を示すブ
ロック図。FIG. 1 is a block diagram showing an embodiment of a wireless telephone device according to the present invention.
【図２】ＴＤＤ／ＴＤＭＡ４多重通信の第３スロットを
使用した移動局における従来例と一実施例の送受信局部
発振周波数の時間変化に対する比較図。FIG. 2 is a comparison diagram of temporal changes in transmitting/receiving local oscillation frequencies of a conventional example and an embodiment of a mobile station using the third slot of TDD/TDMA4 multiplex communication.
【図３】ＴＤＤ方式による無線電話装置の従来の無線回
路構成を示すブロック図。FIG. 3 is a block diagram showing a conventional wireless circuit configuration of a wireless telephone device based on the TDD system.
１ アンテナ ２ ＲＦフィルタ ３ スイッチ ４ 送信パワ−アンプ ５ スイッチ ６ 送信ミキサ ７ 変調器 ８ スイッチ ９ 周波数シンセサイザ １０ 受信アンプ １１ 受信ミキサ １２ ＩＦフィルタ １３ 復調器 １４ 信号入力端子 １５ 信号出力端子 1 Antenna 2 RF filter 3 Switch 4 Transmission power amplifier 5 Switch 6 Transmission mixer 7 Modulator 8 Switch 9 Frequency synthesizer 10 Receiving amplifier 11 Receive mixer 12 IF filter 13 Demodulator 14 Signal input terminal 15 Signal output terminal
Claims (1)
通信を行う時分割デュプレックス方式を使用する無線電
話装置において、送受同一無線周波数とすべく異なる送
受信用局部発振波を切り換えて発生する一つの周波数シ
ンセサイザを具備したことを特徴とする無線電話装置。Claim 1: In a radio telephone device using a time-division duplex method in which time-division communication is performed using the same frequency radio channel for transmission and reception, one frequency is generated by switching different local oscillation waves for transmission and reception so that the transmission and reception are at the same radio frequency. A wireless telephone device characterized by being equipped with a synthesizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14893791A JP3155295B2 (en) | 1991-06-20 | 1991-06-20 | Wireless telephone equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14893791A JP3155295B2 (en) | 1991-06-20 | 1991-06-20 | Wireless telephone equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04372233A true JPH04372233A (en) | 1992-12-25 |
| JP3155295B2 JP3155295B2 (en) | 2001-04-09 |
Family
ID=15463997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14893791A Expired - Lifetime JP3155295B2 (en) | 1991-06-20 | 1991-06-20 | Wireless telephone equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3155295B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05227054A (en) * | 1992-02-15 | 1993-09-03 | Mitsubishi Electric Corp | Radio set |
| US5446770A (en) * | 1993-03-31 | 1995-08-29 | Matsushita Electric Industrial Co., Ltd. | Time division duplex transceiver |
| JP2011514079A (en) * | 2008-02-29 | 2011-04-28 | クゥアルコム・インコーポレイテッド | Dynamic Reference Frequency for Fractional-Division Phase-Locked Loop |
-
1991
- 1991-06-20 JP JP14893791A patent/JP3155295B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05227054A (en) * | 1992-02-15 | 1993-09-03 | Mitsubishi Electric Corp | Radio set |
| US5446770A (en) * | 1993-03-31 | 1995-08-29 | Matsushita Electric Industrial Co., Ltd. | Time division duplex transceiver |
| JP2011514079A (en) * | 2008-02-29 | 2011-04-28 | クゥアルコム・インコーポレイテッド | Dynamic Reference Frequency for Fractional-Division Phase-Locked Loop |
| US9287886B2 (en) | 2008-02-29 | 2016-03-15 | Qualcomm Incorporated | Dynamic reference frequency for fractional-N Phase-Locked Loop |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3155295B2 (en) | 2001-04-09 |
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