JPS5924569B2 - Switching diversity reception method - Google Patents
Switching diversity reception methodInfo
- Publication number
- JPS5924569B2 JPS5924569B2 JP55084793A JP8479380A JPS5924569B2 JP S5924569 B2 JPS5924569 B2 JP S5924569B2 JP 55084793 A JP55084793 A JP 55084793A JP 8479380 A JP8479380 A JP 8479380A JP S5924569 B2 JPS5924569 B2 JP S5924569B2
- Authority
- JP
- Japan
- Prior art keywords
- threshold
- switching
- signal strength
- antenna
- received 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.)
- Expired
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
- H04B7/0802—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 antenna selection
- H04B7/0805—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 antenna selection with single receiver and antenna switching
- H04B7/0814—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 antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Description
【発明の詳細な説明】
この発明は複数のアンテナを一台の受信機に選択的に切
替え接続することによりフエージング等により受信レベ
ルが激しく変動する無線回線において、安定かつ高品質
の通信を確保するための切替ダイパーシティ受信方式に
関するものである。[Detailed Description of the Invention] This invention ensures stable and high quality communication in wireless lines where the reception level fluctuates drastically due to fading etc. by selectively switching and connecting multiple antennas to one receiver. The present invention relates to a switching diversity reception method for
従来の受信ダイパーシティ方式には複数の受信系、即ち
アンテナから中間周波段までの系の複数により構成され
、受信電圧の最も高い受信系を選択する選択ダイパーシ
ティ方式と、複数個のアンテナ（枝）と一台の受信機よ
り構成され、アンテナそのものを切替える切替ダイパー
シティ方式とが存在する。選択ダイパーシティ方式は切
替ダイパーシティ方式に比べて構成が複雑であり、複数
の受信機を必要とするため改善効果は優れているが、高
価なものとなりさらに装置が大型化するなどの欠点があ
つた。一方切替ダイパーシティ方式において１しきい値
のスイツチアンドイクザミン（Ｓｗｉｃｈａｎｄｅｘａ
ｍｉｎｅ）方式、つまりしきい値以下になると、しきい
値を越える枝（アンテナ）を見つけるまで枝の切替えを
行う方式（以下ＳＥ方式と呼ぷ）では例えばアンテナが
２本の場合二つの枝の受信信号がいずれもしきい値以下
になつた時に・・シティシダ状態が生じて受信不能にな
る。Conventional receiving diversity methods consist of multiple receiving systems, that is, systems from the antenna to the intermediate frequency stage, and the selective diversity method selects the receiving system with the highest receiving voltage, and the ) and a switching diversity system that consists of a single receiver and switches the antenna itself. The selective diversity method has a more complex configuration than the switching diversity method, and requires multiple receivers, so it has excellent improvement effects, but it is expensive and has disadvantages such as larger equipment. Ta. On the other hand, in the switching diaperity method, one threshold value switch and
In the SE method (hereinafter referred to as the SE method), when the value is below the threshold, the branches are switched until a branch (antenna) that exceeds the threshold is found. When all received signals fall below the threshold...a city fern condition occurs and reception becomes impossible.
このため通常スイッチアンドステー（ Ｓｗｉｃｈａｎ
ｄｓｔａｙ）方式、即ちしきい値以下になると別の枝に
切替えてその枝に止まる方式（以下５５方式と呼ぷ）や
時定数を設けて切替えるなどの方式が用いられる。５５
方式においては二つの枝の受信信号がいずれもしきい値
以下になつたとき切替えが行われず、受信レベルの低い
枝を選択し続けること、また時定数を設けて切替える方
式ではレベル変動の速さがランダムに変化する場合適当
な時定数の設定が困難であること、またこれらの方式は
早いフエージングに対して改善度の劣化を招き、ＳＥ方
式に比べて改善効果が低下するなどの欠点があつた。For this reason, it is usually called switch and stay.
dstay) method, which switches to another branch and stays at that branch when it falls below a threshold value (hereinafter referred to as the 55 method), or a method in which switching is performed by setting a time constant. 55
In this method, when the received signals of two branches both fall below the threshold, switching is not performed, and the branch with the lower reception level continues to be selected.Also, in the method of switching by setting a time constant, the speed of level fluctuation is There are disadvantages such as it is difficult to set an appropriate time constant when the time constant changes randomly, and these methods cause a deterioration in the degree of improvement due to fast fading, resulting in a lower improvement effect than the SE method. Ta.
さらに１しきい値方式ではしきい値付近で最も高い改善
度が得られるが、しきい値を高く設定すると受信信号の
低（ルベルの部分での改善度が劣化し、逆にしきい値を
最低受信レベル近くまで低く設定すると受信信号の高い
レベルの部分での改善度が劣化する。また実際のフエー
ジングは変動の分布がレーレ分布とは限らず様々に変化
するため、しきい値の設定レベルによつて改善度も変化
することになり、しきい値をどこに設定すればよいかを
一意的に決定することが極めて困難であり、しきい値を
どのように選んでも二台の受信機を用いる選択ダイバー
シテイ受信方式に比べて改善度は劣化する欠点があつた
。この発明はこのような欠点を除去するため一台の受信
機による切替ダイバーシテイ受信方式の一つであるＳＥ
方式において、複数個のしきい値を設け枝の切替及びし
きい値の変更を受信信号強度に応じて自動的に制御する
ようにしたもので、以下詳細に説明する。Furthermore, with the 1-threshold method, the highest degree of improvement can be obtained near the threshold value, but if the threshold value is set high, the degree of improvement in the low (level) part of the received signal deteriorates; If the setting is set low, close to the received level, the degree of improvement in the high level part of the received signal will deteriorate.Also, in actual fading, the distribution of fluctuations is not necessarily Lehre distribution, but changes in various ways, so the threshold setting level The degree of improvement will change depending on the threshold value, and it is extremely difficult to uniquely determine where the threshold value should be set. This invention has the drawback that the degree of improvement is lower than that of the selective diversity reception method used.In order to eliminate this drawback, the present invention uses SE, which is one of the switching diversity reception methods using a single receiver.
In this method, a plurality of threshold values are provided, and branch switching and threshold change are automatically controlled according to the received signal strength, and will be described in detail below.
第１図はこの発明の実施例であつてｍ本のアンテナＡ１
〜Ａｎｌが設けられ、これらアンテナＡ，〜Ａｍはアン
テナ切替回路１１で切替えられてその一つが受信機１２
に接続される。FIG. 1 shows an embodiment of the present invention, in which m antennas A1
~Anl are provided, and these antennas A and ~Am are switched by an antenna switching circuit 11, and one of them is connected to the receiver 12.
connected to.
アンテナ切替回路１１は切替制御回路１３により制御さ
れる。ｎ個のしきい値出力回路Ｂ１〜ＢＯはしきい値切
替制御回路１４により制御され、そのうちの一つが選択
されて切替制御回路１３へ印加される。受信機１２の出
力は出力端子１５へ供給されると共に制御回路１３，１
４へ供給される。ここで切替制御回路１３及びしきい値
切替制御回路１４は次の規則に従つて切替制御を行うも
のとする。The antenna switching circuit 11 is controlled by a switching control circuit 13. The n threshold output circuits B1 to BO are controlled by the threshold switching control circuit 14, and one of them is selected and applied to the switching control circuit 13. The output of the receiver 12 is supplied to an output terminal 15 and a control circuit 13,1.
4. Here, it is assumed that the switching control circuit 13 and the threshold switching control circuit 14 perform switching control according to the following rules.
（１）受信信号強度ｒがそのとき設定されているしきい
値Ｒｔ（１）以下となつた場合に他の枝へ切替える。（
２）その切替後はしきい値を一段低い値Ｒｔ（１＋１）
に変更する。（３）受信信号強度ｒがそのとき設定され
ているしきい値Ｒｔ（１）より一段高いしきい値Ｒｔ（
１−１）以上となつた場合にはしきい値をＲｔ（１−１
）に変更する。（４）受信信号強度ｒが下限しきい値以
下になつたときはＳＥ方式に従つてしきい値を越える枝
を見つけるまで枝の切替えを行なう。なおＲｔ（１）は
与えられたｎ個のしきい値のうち、高い方からｉ番目を
表わし（２）、（３）のしきい値変更は各々Ｒｔ（ｎ）
、Ｒｔ（１）を下限、上限とする。(1) Switch to another branch when the received signal strength r becomes less than the threshold value Rt(1) set at that time. (
2) After switching, the threshold value is set to one level lower value Rt(1+1)
Change to (3) The received signal strength r is a threshold value Rt (
1-1) or more, the threshold value is set to Rt(1-1) or more.
). (4) When the received signal strength r becomes below the lower threshold, branches are switched according to the SE method until a branch exceeding the threshold is found. Note that Rt(1) represents the i-th one from the highest among the given n thresholds, and the threshold changes in (2) and (3) are each expressed as Rt(n).
, Rt(1) are the lower and upper limits.
簡単のため第１図にお〜・てｍ−２の場合について上記
制御法により切替後の受信信号強度が高くなることを示
す。アンテナＡ１及びＡ２の信号強度をｒ１、Ｒ２とし
、切替後の信号強度をＲｓ、しきい値をＲｔ（１）とし
、受信機１２がアンテナＡ１に接続されていたとする。
今信号強度ｒ１がしきい値Ｒｔ（１）を下回つたことが
しきい値切替制御回路１４において検出されると、切替
制御回路１３は規則（１）に従つて受信機１２をアンテ
ナＡ１からアンテナＡ２に接続し、しきい値切替制御回
路１４は規則（２）に従つてしきい値をＲｔ（１＋１）
へ変更する。このときアンテナＡ２よりの受信強度Ｒ２
は次の三つの状態をとり得る。（１）Ｒ２≦Ｒｔ（１＋
１）．（１：）Ｒｔ（１＋１）くＲ２≦Ｒｔ（１）、（
Ｉｌｉ）Ｒ２〉Ｒｔ（１）。（ｉ）の場合には再び切替
が発生し、受信機１２はアンテナＡ１に接続される。切
替及びレベル検出がフエージングピツチに比べて十分速
ければアンテナＡ１の信号強度ｒ！はまだＲｔ（１）を
少し下回つた値でありｒ１〉Ｒ２である。従つて選択ダ
イバーシテイと同じＲＳ−Ｍａｘ（ｒ１、Ｒ２）
（１）が成立する。For the sake of simplicity, FIG. 1 shows that the above control method increases the received signal strength after switching in the case of m-2. It is assumed that the signal strengths of antennas A1 and A2 are r1 and R2, the signal strength after switching is Rs, the threshold is Rt(1), and the receiver 12 is connected to antenna A1.
When the threshold switching control circuit 14 detects that the signal strength r1 has now fallen below the threshold Rt(1), the switching control circuit 13 switches the receiver 12 from the antenna A1 according to rule (1). Connected to antenna A2, threshold value switching control circuit 14 sets the threshold value to Rt(1+1) according to rule (2).
Change to At this time, the reception strength R2 from antenna A2
can take the following three states: (1) R2≦Rt(1+
1). (1:)Rt(1+1)×R2≦Rt(1), (
Ili) R2>Rt(1). In case (i), switching occurs again and the receiver 12 is connected to the antenna A1. If the switching and level detection are sufficiently fast compared to the fading pitch, the signal strength of antenna A1 r! is still a value slightly below Rt(1), and r1>R2. Therefore, RS-Max(r1, R2) is the same as selection diversity.
(1) holds true.
ただしＭＯ（ｒ１、Ｒ２）はｒ１、Ｒ２の大きな方の値
を示す。（４）の場合には受信機１２はアンテナＡ２に
接続され信号強度ｒ１、Ｒ２がともに両しきい値の間を
とるために必ずしも式（１）は成立しないが、その劣化
量の最大値△Ｍａｘは△Ｍａｘ−Ｒｔ（１）−Ｒｔ（１
＋１） （２）である。また（１：：）の場合は明ら
かにＲ２〉ｒ１であり式（１）が成立する。この時には
切替後規則（２）に従つてしきい値は一旦Ｒｔ（１＋１
）に変更されるが、アンテナＡ２の信号強度Ｒ２のレベ
ル検出後、規則（３）に従つて切替制御回路１４はしき
い値をＲｔ（１）に引き上げる。以上述べたようにこの
方式によれば切替後の信号強度がほぼ式（１）で表わせ
ることから選択ダイバーシテイに極めて近い受信信号強
度を得ることができる。However, MO(r1, R2) indicates the larger value of r1 and R2. In the case of (4), the receiver 12 is connected to the antenna A2 and the signal strengths r1 and R2 are both between the two thresholds, so equation (1) does not necessarily hold, but the maximum value of the amount of deterioration △ Max is △Max-Rt(1)-Rt(1
+1) (2). Furthermore, in the case of (1::), it is clear that R2>r1, and formula (1) holds true. At this time, according to rule (2) after switching, the threshold value is temporarily set to Rt(1+1
), but after detecting the level of signal strength R2 of antenna A2, the switching control circuit 14 raises the threshold to Rt(1) according to rule (3). As described above, according to this method, since the signal strength after switching can be approximately expressed by equation (1), it is possible to obtain a received signal strength extremely close to selection diversity.
なお劣化量△はしきい値数を増加させてしきい値間隔を
狭めることにより小さくできる。これは与えられたしき
い値の上下限の間で成立することであり、最下位のしき
い値以下では従来方式と同様パンチインクが発生する。
従つて大きなフエージング改善度を得るためには最下位
のしきい値を受信機の最低受信レベル付近に設定すれば
よい。第２図はこの発明方式においてしきい値をＲｔ（
１）とＲｔ（２）の２個としたｎ−２の場合について、
しきい値が１個しかない従来の方式と比べたときの受信
信号強度の変化ならびにしきい値の変化を示すものであ
る。Note that the amount of deterioration Δ can be reduced by increasing the number of threshold values and narrowing the threshold interval. This is true between the upper and lower limits of a given threshold; below the lowest threshold, punch ink occurs as in the conventional method.
Therefore, in order to obtain a large degree of fading improvement, the lowest threshold value may be set near the lowest reception level of the receiver. FIG. 2 shows the threshold value Rt(
Regarding the case of n-2 with two pieces, 1) and Rt(2),
It shows the change in received signal strength and the change in the threshold value when compared with a conventional system that has only one threshold value.
第２図中の受信信号強度変化において太線部が第１図の
出力端子１５に出力される。第２図が示すように従来の
方式に比べて出力される平均受信信号強度は高くなつて
いる。第３図はｍ−２、ｎ−２の場合についてレーレフ
エージング下における受信信号゛強度の累積分布を計算
したものである。図において横軸は受信信号強度の相対
値（ＤＢ）を縦軸は横軸を超える確率の累積％を示す。
また曲線１６は切替ダイバーシテイを行わないときの受
信機出力を曲線１７は従来のしきい値が１個しかない切
替ダイバーシテイ時においてしきい値を−１０ｄＢとし
たときの受信機出力を、曲線１８は曲線１７と同じであ
るがしきい値を−１５ｄＢとしたときの受信機出力を、
曲線１９はこの発明方式においてしきい値を１０ｄＢと
−１５ｄＢに選んだときの受信機出力を、曲線２０は選
択ダイバーシテイ時の受信機出力を示す。この図からも
この発明方式は従来の方式よりも広いレベル範囲にわた
つて大きな改善度を得ることができ、また選択ダイバー
シテイに近い改善度が得られることがわかる。以上説明
したように複数個のしきい値を設け、枝の切替及びしき
い値の変更を受信信号強度に応じて自動的に制御するこ
とから、最低しきい値レベルを受信機の最低受信レベル
よりやや上に設定すれば二つの枝の受信信号が同時にこ
のしきい値以下となる確率は極めて小さく、またパンチ
インク状態が起きても受信機の受信不能レベルに極めて
近いため実際上パンチインクの影響を無視することがで
きる。In the received signal strength change in FIG. 2, the bold line portion is output to the output terminal 15 in FIG. As shown in FIG. 2, the average received signal strength output is higher than that of the conventional system. FIG. 3 shows the calculated cumulative distribution of received signal strength under relay aging for the cases m-2 and n-2. In the figure, the horizontal axis shows the relative value (DB) of the received signal strength, and the vertical axis shows the cumulative percentage of the probability of exceeding the horizontal axis.
Curve 16 is the receiver output when switching diversity is not performed, and curve 17 is the receiver output when the threshold is set to -10 dB during switching diversity with only one threshold. 18 is the same as curve 17, but the receiver output when the threshold is set to -15 dB is
Curve 19 shows the receiver output when thresholds are selected to 10 dB and -15 dB in the method of this invention, and curve 20 shows the receiver output when selection diversity is selected. This figure also shows that the method of the present invention can provide a greater degree of improvement over a wider level range than the conventional method, and can also provide a degree of improvement that is close to that of selection diversity. As explained above, since multiple thresholds are provided and branch switching and threshold changes are automatically controlled according to the received signal strength, the lowest threshold level is set to the lowest received level of the receiver. If you set it slightly higher than this, the probability that the received signals of two branches will be below this threshold at the same time is extremely small, and even if a punch ink condition occurs, it is extremely close to the receiver's unreceivable level, so in practice, the punch ink condition is The effect can be ignored.
即ち実際上パンチインク状態なしにＳＥ方式のすぐれた
改善度が得られ、ハンテイノング防止の特別な回路が不
要となる。That is, an excellent improvement over the SE method can be obtained without actually punching ink, and a special circuit for preventing hunting is not required.
しきい値を複数（４〜５個で十分である）に選べば選択
ダイバーシテイ受信とほとんど同程度の改善度を得るこ
とができ、また変動分布が変化しても信号レベルの広い
範囲にわたつて改善することができるので、理想的な選
択ダイバーシテイ受信とほぼ同程度の改善を一台の受信
機で実現できる。枝の切替及びしきい値の変更の制御は
１しきい値に比べて複雑になるが、この制御はデイジタ
ル制御が容易であり、１チツプマイクロコンピユータに
よつて実現ができるので改善度に比べて価格の上昇は小
さくすることができ、また制御はソフトウエアで変更可
能であるので信号の状態に応じてしきい値の設定レベル
を変えるなど、より効果的な制御も可能となる。By selecting multiple thresholds (4 to 5 are sufficient), it is possible to obtain almost the same level of improvement as selective diversity reception, and even if the fluctuation distribution changes, it is possible to obtain a degree of improvement over a wide range of signal levels. Therefore, it is possible to achieve almost the same degree of improvement as ideal selection diversity reception with a single receiver. Control of branch switching and threshold change is more complicated than with one threshold, but this control is easy to digitally control and can be realized with a one-chip microcomputer, so the improvement is The increase in price can be reduced, and since the control can be changed by software, more effective control can be achieved, such as changing the threshold setting level depending on the signal state.
第１図はこの発明による切替ダイバーシテイ受信方式の
実施例を示すプロツク図、第２図はこの発明方式（アン
テナ２本、しきい値２個の場合）と従来方式（アンテナ
２本、しきい値１個）における受信信号強度変化及びこ
の発明方式のしきい値変化の様子を示す曲線図、第３図
はこの発明方式（アンテナ２本、しきい値２個の場合）
についてレーレフエージング下での受信信号強度の累積
分布を示すもの？、１６は切替ダイバーシテイを行わな
いときの受信機出力、１７は従来方式においてしきい値
を−１０ｄＢとしたとき、１８は従来方式においてしき
い値を−１５ｄＢとしたとき、１９はこの発明方式の場
合を、２０は選択ダイバーシテイの場合をそれぞれ示す
。
１１：アンテナ切替回路、１２：受信機、１３：切替制
御回路、１４：しきい値切替制御回路、１５：出力端子
、Ａ，〜Ａｍ：アンテナ、Ｂ１〜Ｂｎ：しきい値出力回
路。FIG. 1 is a block diagram showing an embodiment of the switching diversity reception system according to the present invention, and FIG. Figure 3 is a curve diagram showing changes in received signal strength and threshold changes in the method of this invention (value 1 value);
What indicates the cumulative distribution of received signal strength under Lelelev aging? , 16 is the receiver output when switching diversity is not performed, 17 is the conventional method when the threshold is -10 dB, 18 is the conventional method when the threshold is -15 dB, and 19 is the inventive method. and 20 indicate the case of selection diversity, respectively. 11: Antenna switching circuit, 12: Receiver, 13: Switching control circuit, 14: Threshold switching control circuit, 15: Output terminal, A, ~Am: Antenna, B1 to Bn: Threshold output circuit.
Claims (1)
信機に切替え接続する切替ダイバーシティ受信方式にお
いて、複数個のしきい値を発生するしきい値出力手段と
、あるアンテナの受信信号強度がその時設定されている
しきい値以下になつた時には他のアンテナに切替えると
共に、切替後しきい値を一段低いしきい値に変更し、ま
た受信信号強度がその時設定されているしきい値より高
いしきい値以上になつた場合には、しきい値を一段高い
しきい値に変更し、受信信号強度が上記複数個のしきい
値の下限値より低くなるとしきい値を越えるアンテナを
見つけるまでアンテナの切替を行なうようにアンテナの
切替及びしきい値の変更を受信信号強度に応じて自動的
に制御するアンテナ切替制御及びしきい値切替制御手段
とを具備する切替ダイバーシティ受信方式。1. In a switching diversity reception system in which a plurality of antennas are switched and connected to one receiver by an antenna switching circuit, a threshold output means for generating a plurality of threshold values and a reception signal strength of a certain antenna are set at that time. When the received signal strength falls below the currently set threshold, the antenna is switched to another antenna, and the threshold after switching is changed to one level lower, and the received signal strength is higher than the currently set threshold. If the threshold value exceeds the threshold value, the threshold value is changed to a higher threshold value, and when the received signal strength becomes lower than the lower limit of the multiple threshold values above, the antennas are switched until an antenna exceeding the threshold value is found. 1. A switching diversity reception system comprising antenna switching control and threshold switching control means for automatically controlling switching of antennas and change of threshold according to received signal strength so as to perform switching of antennas and change of threshold according to received signal strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55084793A JPS5924569B2 (en) | 1980-06-23 | 1980-06-23 | Switching diversity reception method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55084793A JPS5924569B2 (en) | 1980-06-23 | 1980-06-23 | Switching diversity reception method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5710542A JPS5710542A (en) | 1982-01-20 |
| JPS5924569B2 true JPS5924569B2 (en) | 1984-06-11 |
Family
ID=13840571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55084793A Expired JPS5924569B2 (en) | 1980-06-23 | 1980-06-23 | Switching diversity reception method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5924569B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4060905A1 (en) * | 2021-03-16 | 2022-09-21 | Samsung Electronics Co., Ltd. | Wireless communication device including antenna modules and operating method of wireless communication device |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4566133A (en) * | 1982-12-27 | 1986-01-21 | Commtech International | Switched diversity method and apparatus for FM receivers |
| US4499606A (en) * | 1982-12-27 | 1985-02-12 | Sri International | Reception enhancement in mobile FM broadcast receivers and the like |
| US4784864A (en) * | 1983-10-25 | 1988-11-15 | Ishida Systems Engineering Co., Ltd. | Food wrapper for a dried seaweed covered mass of rice |
| JPH0761035B2 (en) * | 1985-08-26 | 1995-06-28 | 日本電気株式会社 | Diversity receiver |
| JPH0746168A (en) * | 1993-07-27 | 1995-02-14 | Matsushita Electric Ind Co Ltd | Diversity receiver |
| JP2000295151A (en) | 1999-04-05 | 2000-10-20 | Matsushita Electric Ind Co Ltd | Diversity receiver |
| JP4435956B2 (en) | 1999-09-21 | 2010-03-24 | カヤバ工業株式会社 | caster |
-
1980
- 1980-06-23 JP JP55084793A patent/JPS5924569B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4060905A1 (en) * | 2021-03-16 | 2022-09-21 | Samsung Electronics Co., Ltd. | Wireless communication device including antenna modules and operating method of wireless communication device |
| US11824611B2 (en) | 2021-03-16 | 2023-11-21 | Samsung Electronics Co., Ltd. | Wireless communication device including antenna modules and operating method of wireless communication device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5710542A (en) | 1982-01-20 |
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