JPS5881347A - Space diversity base band combining receiver - Google Patents
Space diversity base band combining receiverInfo
- Publication number
- JPS5881347A JPS5881347A JP56180165A JP18016581A JPS5881347A JP S5881347 A JPS5881347 A JP S5881347A JP 56180165 A JP56180165 A JP 56180165A JP 18016581 A JP18016581 A JP 18016581A JP S5881347 A JPS5881347 A JP S5881347A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- intermediate frequency
- output
- bandpass filter
- received wave
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/084—Equal gain combining, only phase adjustments
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【発明の詳細な説明】
本発明社マイクロ波へ伝送のスペースダイバーシチ・ベ
ースバンド合成受信機に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a space diversity baseband synthesis receiver for transmission to microwaves.
スペースダイバーシチ・ベースバンド合成受信方式は１
線の信頼度を高め、同時に信号対雑音比をも高める伝送
方式の一つである。Space diversity baseband combining reception method is 1
It is one of the transmission methods that increases line reliability and also increases the signal-to-noise ratio.
これまでの方法によると、同一の受信機を２台用いベー
スバンドの出力で同相合成をしていたため、単独受信構
成に比し熱雑音は改善されるが、歪雑音の改善は全く期
待できなかった。According to the previous method, two identical receivers were used and in-phase synthesis was performed using the baseband output, which improved thermal noise compared to a single reception configuration, but no improvement in distortion noise could be expected. Ta.
受信機の歪みの要因としてはＲＦ系やＩＦ系のる波器に
よる群遅延特性と微分利得特性および復調器（ベースバ
ンド系増幅器を含む）の非直線性、群遅延特性、微分利
得特性であり、′歪みの中でも二次歪が支配的である。The causes of receiver distortion are the group delay characteristics and differential gain characteristics of the RF and IF system waveformers, as well as the nonlinearity, group delay characteristics, and differential gain characteristics of the demodulator (including the baseband amplifier). , ′The second-order distortion is dominant among the distortions.
工場で複数の受信機を同時期に製作した場合嘱電気的特
性は極めて類似しており、当然二次歪も同一特性を有し
ている０
本発明はこのように同一の特性を有するものを並列に合
成するベースバンド合成受信機になしたもので、その目
的は二次歪の低減化を図ったスペースダイバーシチ・ベ
ースノ（ンド合成受信機を提供することにある。When multiple receivers are manufactured at the same time in a factory, their electrical characteristics are extremely similar, and naturally the second-order distortion also has the same characteristics. This is a baseband combining receiver that performs parallel combining, and its purpose is to provide a space diversity baseband combining receiver that reduces second-order distortion.
前記目的を達成するために本発明によるスペースタイバ
ーシチ・ペースノくンド合成受信機は１第１受信波の第
１バンドパスフイルタと、第２Ｏ受信波の第２バンドパ
スフイルタと、前記第１バンドパスフイルタから出力さ
れる第１受信波周波数を中間周波数に変換する第１周波
数変換器と鴬前記第２バンドパスフィルタから出力され
る第２受信波周波数を中間周波数に変換する第２周波数
変換器と、前記第１周波数変換器に接続され、下記（１
）式の条件を満たす周波数ｆｐｘを出力する第１局部発
振器と、前記第２周波数変換器に接続され、下記（２）
式の条件を満たす周波数ｆすを出力する第２局部発振器
と、前記第１周波数変換器から出力される中間周波数の
第１中間周波パｙドハスフィルタと、前記第２周波数変
換器から出力される中間周波数の第２中間周波バンドパ
スフィルタと、前記第１中間周波パｙドパスフィルタ出
力をベースバンド信号に復調する第１ＦＭ復調器と、周
波数偏移に対して前記第１ＦＭ９＄４器と同一のベース
バンド出力極性を有し、前記第２中間周波バンドパスフ
ィルタ出力をベースバンド信号に復調する第２ＦＭ復調
器と、前記第１、第２ＦＭ復調器出力を合成する逆相Ｉ
・イブリッドとから構成しである。In order to achieve the above object, the space diversity/space receiver according to the present invention includes a first bandpass filter for a first received wave, a second bandpass filter for a second received wave, and a second bandpass filter for the first received wave. A first frequency converter that converts the first received wave frequency output from the pass filter into an intermediate frequency; and a second frequency converter that converts the second received wave frequency output from the second band pass filter into an intermediate frequency. and the following (1) are connected to the first frequency converter.
) is connected to the first local oscillator that outputs a frequency fpx that satisfies the condition of the formula and the second frequency converter, and is connected to the following (2).
a second local oscillator that outputs a frequency f that satisfies the condition of the expression; a first intermediate frequency frequency filter that outputs an intermediate frequency that is output from the first frequency converter; and an intermediate frequency that is output from the second frequency converter. a second intermediate frequency bandpass filter for the frequency, a first FM demodulator for demodulating the first intermediate frequency bandpass filter output into a baseband signal, and a first FM demodulator that is identical to the first FM9 for frequency deviation. a second FM demodulator that has a baseband output polarity and demodulates the second intermediate frequency bandpass filter output into a baseband signal; and a negative phase I that combines the first and second FM demodulator outputs.
・It is composed of Ibrid.
記
。−ｆＬｘ ＝ ｆｗ ＋ ｆ工 ・・−・・・・・
（１）ｆＬｚ ＝ｆＲ−ｆ工 ・・・−・・・・
（２）ただしｆＲは第１、第２受信波周波数
ｆ工は中間周波数
上記構成によれば、歪は低減され本発−の目的は完全に
達成される。Record. −fLx = fw + f engineering ・−・・・・・
(1) fLz = fR - f engineering ・・・−・・・・
(2) However, fR is the first received wave frequency, and f is the intermediate frequency. According to the above configuration, distortion is reduced and the purpose of the present invention is completely achieved.
以下、図面を参照して本発明をさらに詳しく説明する。Hereinafter, the present invention will be explained in more detail with reference to the drawings.
第１図は本発明によるスペースダイバーシチ・ベースバ
ンド合成受信機の一実施例を示す回路ブロック図である
。 入力１＆および入力１ｂはそれぞれ図示しない空中
線系に接続される受信機の入力端子である。 今、受信
波の周波数をｆＲとし、入力端子１＆に入力される受信
波を第１受信波、入力端子１ｂに入力される受信波を第
２受信波とすると、第１受信波はＲＦ系の第１バンドパ
スフイルタ（ＢＰＦ）２ａｔｊ１つて第１周波数変換器
３ａに導びかれ、同様に第２受信波もＲＦ系Ｏ第２パ／
ドパスフィルタ２ｂを通って第２周波数変換器２ｂＫ導
びかれる。 第１局部発振器４ａは１中間周波数の中心
周波数をｆ工、受信周波数をｆＲとすると、その発振周
波数ｆｘ、ｘは下記（３）式を満たすように設定されて
いる。FIG. 1 is a circuit block diagram showing an embodiment of a space diversity baseband combining receiver according to the present invention. Input 1& and input 1b are input terminals of a receiver connected to an antenna system (not shown), respectively. Now, if the frequency of the received wave is fR, the received wave input to input terminal 1 & is the first received wave, and the received wave input to input terminal 1b is the second received wave, then the first received wave is the RF system. A first band pass filter (BPF) 2atj is guided to the first frequency converter 3a, and the second received wave is also guided to the RF system O second pass filter.
The signal is guided through a second frequency converter 2bK through a second frequency converter 2b. The first local oscillator 4a has its oscillation frequencies fx and x set to satisfy the following equation (3), where f is the center frequency of one intermediate frequency and fR is the reception frequency.
ｆｘ鴛ｆ１．＊ −ｆエ −・・・−・・（３）ま
た、第２局部発振器４ｂもその発振周波数ｆＩＩ雪は下
記（４）式を満たすように設定されている。fx roe f1. * - f - (3) Also, the oscillation frequency fII of the second local oscillator 4b is set so as to satisfy the following equation (4).
ｆｘ＝ｆｔｘ＋ｆエ −−−（４）したがって、第
１、第２周波数変換器３ａ１３ｂからそれぞれ出力され
る中間周波数ｆ工の周波数傷害方向は経路９ａと９ｂで
は逆になり、これ以後の回路で発生する二次歪は２系統
の歪率が同一であれば１８００位相がずれることになる
。 経路９ａを経由した信号は第１中間周波メンドパス
フィルタ（ＩＦ ＢＰＦ）５ａｔ通シ復調器６ａによっ
てベースバンド信号に変換される。 同様に経路９ｂを
経由した信号も第２中間周波バンドパスフィルタ（ＩＦ
ＢＰＦ）５ｂを通夛復調器６ｂに導びかれ、ベースバン
ド信号に復調される。fx=ftx+f--(4) Therefore, the directions of frequency damage of the intermediate frequency f output from the first and second frequency converters 3a13b are opposite on the paths 9a and 9b, and the damage occurs in the subsequent circuits. If the distortion factors of the two systems are the same, the secondary distortion will be out of phase by 1800 degrees. The signal via the path 9a is converted into a baseband signal by a first intermediate frequency mendpass filter (IF BPF) 5at and a through demodulator 6a. Similarly, the signal passing through path 9b is also applied to the second intermediate frequency band pass filter (IF
BPF) 5b is guided to an integrated demodulator 6b and demodulated into a baseband signal.
第１、第２復調器６ａと６ｂは中間周波の周波数偏移に
対しそれぞれ同一の極性特性を有しているので、出力信
号１０凰と１０ｂは極性が逆となって現われる。 これ
ら信号１０ａとｘｏｂｉこの後逆相ハイブリッド７によ
って合成される。Since the first and second demodulators 6a and 6b have the same polarity characteristics with respect to the frequency shift of the intermediate frequency, the output signals 10 and 10b appear with opposite polarities. These signals 10a and xobi are then combined by the anti-phase hybrid 7.
したがって信号成分は、同相に、二次歪成分は逆相に合
成され出力端子８よシペースバンド出力が取り出される
。Therefore, the signal components are combined into the same phase, and the second-order distortion components are combined into the opposite phase, and a space band output is taken out from the output terminal 8.
従来回路では、周波数変換器の局部発振周波数を同一に
選んでいたため、第１図におけるＩＦ ＢＰＦ以後で発
生する二次歪は同相に合成され、信号対歪比は改善され
なかった。In the conventional circuit, since the local oscillation frequencies of the frequency converters were selected to be the same, the second-order distortion occurring after the IF BPF in FIG. 1 was synthesized in phase, and the signal-to-distortion ratio was not improved.
しかし九本発明によれば、二次歪率が２つの系統で同一
ならば無限に改善される可能性を有している。However, according to the present invention, if the second-order distortion factor is the same in the two systems, there is a possibility of infinite improvement.
以上１詳しく説明したように本発明によれば二次歪を低
減したマイクロ波ＦＭ伝送のスペースダイバーシチ・ベ
ースバンド合成受信機を提供できる。As described in detail above, according to the present invention, it is possible to provide a space diversity baseband synthesis receiver for microwave FM transmission with reduced second-order distortion.
第１図線本発明によるスペースダイバーシチ・ベースバ
ンド合成受信機の一実施例を示す回路図である。
１八−第１受信波入力端子
１ｂ−第２受信波入力端子
ｆｉａ−第１マイクロ波ＢＰＦ
２ｂ−第２マイク四波ＢＰＦ
３ａ−第１受信周波数変換器
３ｂ−第２受信周波数変換器
４ａ−第１局部発振器
４ｂ−第２局部発振器
５ａ−第１ ＩＦ ＢＰＦ
５ｂ−第２ＩＦＢＰＦ
６ａ−第１ＦＭ復調器
６ｂ−第２ＦＭ復調器
７・・・逆相ハイブリッド
８・・・ベースバンド出力端子
特許出願人 日本電気株式金線
代理人 弁理士 井 ノ ロ 壽第１図
６FIG. 1 is a circuit diagram showing an embodiment of a space diversity baseband combining receiver according to the present invention. 18-First received wave input terminal 1b-Second received wave input terminal fia-First microwave BPF 2b-Second microphone four-wave BPF 3a-First reception frequency converter 3b-Second reception frequency converter 4a- First local oscillator 4b - Second local oscillator 5a - First IF BPF 5b - Second IFBPF 6a - First FM demodulator 6b - Second FM demodulator 7... Anti-phase hybrid 8... Baseband output terminal Patent applicant NEC Corporation Gold Wire Agent Patent Attorney Hisashi Inoro Figure 1 6
Claims (1)
の第２バンドパスフイルタと、前記第１バンドパスフイ
ルタから出力される第１受信波周波数を中間周波数に変
換する第１周波数変換器と、前記第２バンドパスフイル
タから出力される第２受信波周波数を中間周波数に変換
する第２周波数変換器と、前記第１周波数変換器に接続
され、下記（１）式の条件を満たす周波数ｆＬｌを出力
する第１局部発振器と、前記第２周波数変換器に接続さ
れ、下記（２）式の条件を温良す周波数ｆＬｚを出力す
る第２局部発振器と、前記第１周波数変換器から出力さ
れる中間周波数の第１中間周波バンドパスフィルタと、
前記第２周波数変換器から出力される中間周波数の第２
中間周波バンドパスフィルタと、前記第１中間周波バｙ
ドバスフィルタ出力をベースバンド信号に復調する第１
ＦＭ復調器と、周波数偏移に対して前記第１ ＦＭ復調
器と同一のベースバンド出力極性を有し、前記第２中間
周波バンドパスフィルタ出力をベースバンド信号に復調
する第２ ＦＭ復調器と、前記第１、第２ ＦＭ復調器
出力を合成する逆相ハイブリッドとから構成シタスペー
スダイバーシチ・ベースバント合成受信機。 記 ｆいｅ＝ｆＲ＋ｆエ −・−・・・・ （１
）ｆリーｆｘ −ｆエ ｍ−・・・ （２）た
だしｆＲ祉第１、第２受信波周波数 ｌｘは中間周波数[Claims] A first bandpass filter for a first received wave, a second bandpass filter for a second received wave, and a first received wave frequency output from the first bandpass filter to an intermediate frequency. A first frequency converter converting the frequency, a second frequency converter converting the second received wave frequency output from the second bandpass filter into an intermediate frequency, and a second frequency converter connected to the first frequency converter, and the following (1) ); a second local oscillator connected to the second frequency converter and outputting a frequency fLz that satisfies the condition of equation (2) below; a first intermediate frequency bandpass filter of an intermediate frequency output from the first frequency converter;
a second intermediate frequency output from the second frequency converter;
an intermediate frequency bandpass filter; and the first intermediate frequency bandpass filter.
The first demodulates the baseband filter output into a baseband signal.
an FM demodulator; and a second FM demodulator having the same baseband output polarity with respect to frequency shift as the first FM demodulator and demodulating the second intermediate frequency bandpass filter output into a baseband signal. , and an anti-phase hybrid that combines the outputs of the first and second FM demodulators. Note: f = fR + f -・−・・・・ (1
)fx - fx m-... (2) However, fRx's first and second received wave frequencies lx are intermediate frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56180165A JPS5881347A (en) | 1981-11-10 | 1981-11-10 | Space diversity base band combining receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56180165A JPS5881347A (en) | 1981-11-10 | 1981-11-10 | Space diversity base band combining receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5881347A true JPS5881347A (en) | 1983-05-16 |
| JPS623622B2 JPS623622B2 (en) | 1987-01-26 |
Family
ID=16078529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56180165A Granted JPS5881347A (en) | 1981-11-10 | 1981-11-10 | Space diversity base band combining receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5881347A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5630213A (en) * | 1992-12-22 | 1997-05-13 | Motorola, Inc. | RF antenna switch and method of operating the same |
-
1981
- 1981-11-10 JP JP56180165A patent/JPS5881347A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5630213A (en) * | 1992-12-22 | 1997-05-13 | Motorola, Inc. | RF antenna switch and method of operating the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS623622B2 (en) | 1987-01-26 |
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