JPH0327626A - Synthesis diversity reception circuit after reception level adaptive detection - Google Patents
Synthesis diversity reception circuit after reception level adaptive detectionInfo
- Publication number
- JPH0327626A JPH0327626A JP1160938A JP16093889A JPH0327626A JP H0327626 A JPH0327626 A JP H0327626A JP 1160938 A JP1160938 A JP 1160938A JP 16093889 A JP16093889 A JP 16093889A JP H0327626 A JPH0327626 A JP H0327626A
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- JP
- Japan
- Prior art keywords
- circuit
- weighting
- reception level
- detection
- detector
- 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
- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 230000015572 biosynthetic process Effects 0.000 title claims description 9
- 238000003786 synthesis reaction Methods 0.000 title claims description 9
- 230000003044 adaptive effect Effects 0.000 title claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 238000005562 fading Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000010187 selection method Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はディジタル移動無線伝送においてマルチパスフ
ェージングによる伝送品質の劣化を改善する合成ダイバ
ーシチ受信回路に係わる。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite diversity receiving circuit that improves deterioration in transmission quality due to multipath fading in digital mobile radio transmission.
（従来の技術）
ディジタル移動通信ではマルチバスフェージングによる
回線品質劣化により誤り率特性が劣化する．フェージン
グの影響を軽減する技術として２つ以上の受信波を利用
するダイバーシチ受信がある．これは複数の受信波に対
するフェージングの相関が小さいことを利用して、一方
の受信波のレベルが落ち込んでも他方の受信波を用いる
ことによって良好な品質を実現する技術である。これに
は受信レベルに応じてレベルの高い方の受信波を選択す
る選択法、全ての受信波位相を同相にしたうえで受信波
を合成する等利得合成法や受信レベルに比例する重み付
けをしてから受信波を合成する最大比合成法がある．等
利得合成法や最大比合成法は選択法に比べ特性が優れる
ものの、検波前ダイバーシチに適用する場合にはランダ
ムに変動ずる受信信号の位相を合わせて合戊する必要が
あり、受信波が高速に変動する移動通信の場合には実現
が困難であった。(Conventional technology) In digital mobile communications, error rate characteristics deteriorate due to deterioration of line quality due to multibus fading. Diversity reception, which uses two or more received waves, is a technique to reduce the effects of fading. This is a technique that utilizes the fact that the fading correlation between multiple received waves is small, and achieves good quality by using the other received waves even if the level of one received wave drops. This includes a selection method that selects a received wave with a higher level according to the received level, an equal gain synthesis method that combines the received waves after making all the received waves in phase, and weighting that is proportional to the received level. There is a maximum ratio combining method that combines the received waves after Although the equal gain combining method and the maximum ratio combining method have better characteristics than the selection method, when applied to diversity before detection, it is necessary to match the phases of the randomly fluctuating received signals and combine them. This was difficult to achieve in the case of mobile communications, which fluctuate rapidly.
そこで検波前ダイバーシチとしては選択法が用いられて
いるが、切替用スイッチが検波器より前に置かれ、切替
は受信波の位相に無関係に行なうから、２つの受信波の
位相連続の切替ができず、切替により生ずる位相ジャン
プによって復調後にインパルス性の雑音が生ずるために
誤りが発生するという欠点がある。これを解決する方法
として検波後のベースバンド信号を受信レベルに応じて
切り替える検波後選択ダイバーシチが採用されている。Therefore, a selection method is used for diversity before detection, but since the changeover switch is placed before the detector and the switching is done regardless of the phase of the received waves, it is not possible to switch the continuous phase of the two received waves. First, there is a drawback that errors occur because impulsive noise is generated after demodulation due to phase jumps caused by switching. As a method to solve this problem, post-detection selection diversity is adopted in which the baseband signal after detection is switched according to the reception level.
しかし、この方法では常に最も受信レベルの大きい１ブ
ランチ分の］言号しか受信しない。ところが、他のブラ
ンヂでもレベルの高い信号が受信されている場合がある
から、これらを検波後に合成すれば伝送特性をさらに改
善することができるはずである。それが検波後合成法で
あり、これにも等利得合成法や最大比合成法がある．こ
れもＦＳＫの周波数検波方式に適用するときの実験例は
既に検討されている。しかし、これらの方式では変調方
式がＦＳＸのため、検波器前にリミタを用いるので検波
器出力を単に合成するだけでは伝送特性の改善は見込め
ないという問題かあった。However, with this method, only the words for one branch with the highest reception level are always received. However, since high-level signals may also be received at other branches, it should be possible to further improve the transmission characteristics by combining these signals after detection. This is the post-detection combining method, which also includes the equal gain combining method and the maximum ratio combining method. Experimental examples of applying this to the FSK frequency detection method have already been studied. However, in these systems, since the modulation method is FSX and a limiter is used before the detector, there is a problem that improvement in transmission characteristics cannot be expected by simply combining the outputs of the detectors.
（発明が解決しようとする課題）
本発明は上記問題点に鑑みなされたもので、復調前にリ
ミタを用いた回路でも伝送特性が改善される検波後合成
ダイバーシチ受信回路を提供することを目的とする。(Problems to be Solved by the Invention) The present invention was made in view of the above-mentioned problems, and an object thereof is to provide a post-detection synthesis diversity receiving circuit in which transmission characteristics are improved even in a circuit using a limiter before demodulation. do.
（課題を解決するための手段）
本発明の特徴は、線形変調を用い受信側でりくタで振幅
制限後に復調して各ダイバーシチ枝の信号を合戒する検
波後合成ダイバーシチ受信回路において、各ダイバーシ
チ枝の振幅制限前の受信レベルを検出する受信レベル検
出器と、ダイバーシチ技の検波器出力を前記受信レベル
に従った重み付けで合成する重み付け合成器と、その出
力に接続されてデー゜夕の１．０を判定して出力するデ
ータ判定回路とを有し、前記重み付け合成器と前記デー
タ判定回路は多重化信号により時分割利用される、受信
レベル適応形検波後合成ダイバーシチ受信回路にある。(Means for Solving the Problems) A feature of the present invention is that in a post-detection combining diversity receiving circuit that uses linear modulation and demodulates and combines signals of each diversity branch after amplitude limitation in a receiver on the receiving side, each diversity a reception level detector that detects the reception level before the amplitude limit of the branch; a weighting synthesizer that combines the diversity detector outputs with weighting according to the reception level; The weighting combiner and the data determining circuit are included in a receiving level adaptive post-detection combining diversity receiving circuit that is time-divisionally used with multiplexed signals.
（作用）
復調前にリミタを用いた場合に検波器出力を単に合成す
るたけでは伝送特性の改善が見込めないのは、受信レベ
ルの低いブランチの検波器出力に大きな雑音が生ずるた
めである。そこで、検波器出力を受信レベルで重み付け
して合成すればこのような問題は生じない。さらに、検
波後の合戒たから受信波位相を同相にする必要しない。(Function) When a limiter is used before demodulation, it is not possible to improve the transmission characteristics by simply combining the detector outputs because large noise is generated in the detector outputs of branches with low reception levels. Therefore, if the detector outputs are weighted and synthesized by the reception level, this problem will not occur. Furthermore, since the signals are combined after detection, it is not necessary to make the phases of the received waves the same.
なお、ＱＩ’ＳＲなどの多相位相変調信号を検波後合成
する場合には各相毎に重み付け合成回路を必要とし回路
規模が大きくなる問題がある。そこで、本発明では受信
レベルに対応して重み付けをした後検波後合成するダイ
バーシチ方式において、各相毎の検波信号を時分割で取
り込み、重み付け合成回路、データ判定回路を時分割で
利用することにより、簡易な受信レベル適応形検波後合
成ダイバーシヂ受信回路を提供する。Note that when a multiphase phase modulation signal such as QI'SR is synthesized after detection, a weighting synthesis circuit is required for each phase, which increases the circuit scale. Therefore, in the present invention, in a diversity method in which the detection signal is combined after weighting according to the reception level, the detection signal of each phase is acquired in a time-division manner, and the weighting synthesis circuit and the data judgment circuit are used in a time-division manner. , provides a simple received level adaptive detection and synthesis diversity receiving circuit.
（実施例）
ＱＰＳＫ信号を２つの検波器で遅延検波し、検波信号を
重み付け合成する場合で説明する。本発明の実施例を第
１図に示す。(Example) A case will be explained in which a QPSK signal is differentially detected by two detectors and the detected signals are weighted and combined. An embodiment of the invention is shown in FIG.
入力端子１−１ 、１−２によりＩＰ信号１、ＩＦ信号
２を遅延検波器２−１ ， ２−２と受信レベル検出器
３−１ 、３−２に入力し、ＣＯＳおよびＳＩＮ検波出
力１１＋ Ｑ＋． Ｉｔ． Ｑ２およびＲｔ， ＲＩｌ
を得る。シンボルタイくング毎にこの検波出力と受信レ
ベルをサンフル＆ホールドする。Input terminals 1-1 and 1-2 input IP signal 1 and IF signal 2 to delay detectors 2-1 and 2-2 and reception level detectors 3-1 and 3-2, and COS and SIN detection outputs 11+ Q+. It. Q2 and Rt, RIl
get. This detection output and reception level are sampled and held for each symbol tying.
サンプリングタイミングを第２図に示す。シンボルタイ
くングは第２図のように、アイパターンの真中に設定す
る。遅延検波出力ではＩ，Ｑと６にこのようなアイパタ
ーンになる。アイが開いているところは最も誤り率特性
が良いところであるから、そこでサンプシングすれば特
性が良くなるからである。また受信レベルも同時にサン
プルする．サンプルした受信レベルを重み付け回路５−
１ 、５−２に入力する。重み付け合成器６は、スイッ
チ９−１ 、９−２ 、乗算器１０−１、１０−２、加
算器１１により構或される。スイッチ９−１ 、９−２
は第２図に示すビットタイくンクで連動して動作し、ホ
ールドされた検波器出力信号Ｉ，， Ｉ．あるいはＱ＋
，Ｑｚを選択出力し、それぞれ重み付け回路出力により
乗算器１０−１， １０−２により重み付けして加算器
１１により合成し、信号工あるいはＱとして出力する。The sampling timing is shown in FIG. Symbol tying is set in the center of the eye pattern as shown in Figure 2. The delayed detection output has such an eye pattern for I, Q and 6. This is because the area where the eye is open has the best error rate characteristics, so sampling there will improve the characteristics. The reception level is also sampled at the same time. Weighting circuit 5- for the sampled reception level
1, enter in 5-2. The weighted combiner 6 is composed of switches 9-1 and 9-2, multipliers 10-1 and 10-2, and an adder 11. Switches 9-1, 9-2
operate in conjunction with the bit tie circuit shown in FIG. 2, and output the held detector output signals I,, I. Or Q+
.
データ判定器７は重み付け合成器６の出力信号工あるい
はＱをビットタイくング毎にスレシホールドレベルと比
較して符号判定し、出力端子８に２値データとして出力
ずる。つまり８からはＩ出力とＱ出力が時分割されて出
力される。The data determiner 7 compares the output signal signal or Q of the weighting synthesizer 6 with a threshold level for each bit timing to determine the sign, and outputs it to the output terminal 8 as binary data. In other words, from 8, the I output and Q output are time-divided and output.
第１図に示す実施例においてホールドされた受信レベル
Ｒ．， Ｒ．およびＣＯＳ検波出力Ｉ．， Ｉ．， Ｓ
ＩＮ検波出力Ｑ＋． Ｑｚを順次Ａ／Ｄ変換したのち重
み付け合成をＤＳＰなどの信号処理回路を用いて実現し
、演算結果をデータ判定して出力することもできる。The reception level R. held in the embodiment shown in FIG. , R. and COS detection output I. , I. , S
IN detection output Q+. It is also possible to implement weighted synthesis using a signal processing circuit such as a DSP after sequentially A/D converting Qz, and then perform data judgment on the calculation result and output it.
（発明の効果）
以上説明したように本発明によれば合成回路を複数必要
とせず、簡易に受信レベル適応形検波後合戒ダイバーシ
チ受信回路を実現することかできる。(Effects of the Invention) As described above, according to the present invention, it is possible to easily realize a received level adaptive detection combined diversity receiving circuit without requiring a plurality of combining circuits.
受信レベルのｎ乗に比例する重み付けをする場合につい
て、ｎと合成受信後の誤り率との関係について測定した
結果を第３図に示す。また、比較のため検波後選択合成
の特性も示した。これより、ｎとしては受信レベルの１
．５とすることにより選択合成ダイバーシチに比較して
改善が得られる。FIG. 3 shows the results of measuring the relationship between n and the error rate after combined reception in the case of weighting proportional to the n-th power of the reception level. For comparison, the characteristics of selective synthesis after detection are also shown. From this, n is 1 of the reception level.
．． 5, an improvement can be obtained compared to selective combining diversity.
第４図に誤り率特性を示した。２ブシンヂを用いる場合
、誤り率か１０−２において選択タイバーシチより約１
．５ ｄｌｌ大きな利得が得られている。このように、
本発明を用いると簡易な回路構或でかつ従来の選択ダイ
バーシチより大きな効果が得られる．Figure 4 shows the error rate characteristics. When using 2-businji, the error rate is about 1 lower than the selection diversity at 10-2.
．． 5 dll large gain is obtained. in this way,
By using the present invention, a greater effect than conventional selection diversity can be obtained with a simple circuit configuration.
第１図は本発明による検波後合成ダイバーシチ受信回路
のブロック図、
第２図は第１図におけるサンプリングタイミングの例を
示す図、
第３図と第４図は本発明の効果を示す図である．
１−１
２−１
３−１
４ ；
５−１
６ ；
７ ；
８ ；
， １−２ ；入力端子、
， ２−２ ；遅延検波器、
， ３−２ ；受信レベル検出器、
サンプルホールド回路、
， ５−２ ：重み付け回路、
重み付け合成器、
データ判定回路、
出力端子。FIG. 1 is a block diagram of a post-detection synthesis diversity receiving circuit according to the present invention, FIG. 2 is a diagram showing an example of sampling timing in FIG. 1, and FIGS. 3 and 4 are diagrams showing the effects of the present invention. ．． 1-1 2-1 3-1 4; 5-1 6; 7; 8; , 1-2; Input terminal, , 2-2; Delay detector, 3-2; Reception level detector, sample-hold circuit , , 5-2: Weighting circuit, weighting synthesizer, data judgment circuit, output terminal.
Claims (1)
各ダイバーシチ枝の信号を合成する検波後合成ダイバー
シチ受信回路において、 各ダイバーシチ枝の振幅制限前の受信レベルを検出する
受信レベル検出器と、 各ダイバーシチ枝の検波器出力を前記受信レベルに従っ
た重み付けで合成する重み付け合成器と、 その出力に接続されてデータの１、０を判定して出力す
るデータ判定回路とを有し、 前記重み付け合成器と前記データ判定回路は多重化信号
により時分割利用されることを特徴とする、受信レベル
適応形検波後合成ダイバーシチ受信回路。[Claims] In a post-detection/synthesis diversity receiving circuit that uses linear modulation and limits the amplitude with a limiter on the receiving side, then demodulates and synthesizes the signals of each diversity branch, the reception level of each diversity branch before the amplitude limitation is detected. a reception level detector; a weighting combiner that combines the detector outputs of each diversity branch with weighting according to the reception level; and a data judgment circuit connected to the output of the weighting combiner that judges whether data is 1 or 0 and outputs the result. A receiving level adaptive post-detection combining diversity receiving circuit, characterized in that the weighting combiner and the data determining circuit are used in a time-division manner using multiplexed signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1160938A JP2756477B2 (en) | 1989-06-26 | 1989-06-26 | Received level adaptive post-detection combining diversity receiver circuit. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1160938A JP2756477B2 (en) | 1989-06-26 | 1989-06-26 | Received level adaptive post-detection combining diversity receiver circuit. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0327626A true JPH0327626A (en) | 1991-02-06 |
| JP2756477B2 JP2756477B2 (en) | 1998-05-25 |
Family
ID=15725477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1160938A Expired - Lifetime JP2756477B2 (en) | 1989-06-26 | 1989-06-26 | Received level adaptive post-detection combining diversity receiver circuit. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2756477B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5761252A (en) * | 1994-05-16 | 1998-06-02 | Sanyo Electric Co., Ltd. | Diversity reception device |
| US6139515A (en) * | 1997-02-03 | 2000-10-31 | Wen Tao | Phimosis curing appliance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6285523A (en) * | 1985-10-09 | 1987-04-20 | Nec Corp | Adaptive receiving equipment |
| JPS63313934A (en) * | 1987-06-17 | 1988-12-22 | Toshiba Corp | Digital radio receiver |
-
1989
- 1989-06-26 JP JP1160938A patent/JP2756477B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6285523A (en) * | 1985-10-09 | 1987-04-20 | Nec Corp | Adaptive receiving equipment |
| JPS63313934A (en) * | 1987-06-17 | 1988-12-22 | Toshiba Corp | Digital radio receiver |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5761252A (en) * | 1994-05-16 | 1998-06-02 | Sanyo Electric Co., Ltd. | Diversity reception device |
| US6161001A (en) * | 1994-05-16 | 2000-12-12 | Sanyo Electric Co., Ltd. | Diversity reception device |
| US6139515A (en) * | 1997-02-03 | 2000-10-31 | Wen Tao | Phimosis curing appliance |
| CN100387206C (en) * | 1997-02-03 | 2008-05-14 | 伊东宽治 | Phimosis correctional appliance |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2756477B2 (en) | 1998-05-25 |
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