JPH09191305A - Diversity receiver - Google Patents
Diversity receiverInfo
- Publication number
- JPH09191305A JPH09191305A JP8002001A JP200196A JPH09191305A JP H09191305 A JPH09191305 A JP H09191305A JP 8002001 A JP8002001 A JP 8002001A JP 200196 A JP200196 A JP 200196A JP H09191305 A JPH09191305 A JP H09191305A
- Authority
- JP
- Japan
- Prior art keywords
- bit error
- electric field
- antenna
- field strength
- error rate
- 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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- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、フェージングに伴
う無線通信、特に移動体通信に用いられるダイバーシテ
ィ受信機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity receiver used for radio communication associated with fading, particularly mobile communication.
【０００２】[0002]
【従来の技術】ダイバーシティ受信機は、無線通信にお
けるフェージングの影響を軽減する手段として公知であ
るが、自局または相手局の移動に起因する深いフェージ
ングが発生する移動体通信、特に自動車電話、携帯電話
をはじめとする移動体通信用の基地局無線設備に広く用
いられ、最近、装置の小型化が要求される移動局にも用
いられるようになってきた。2. Description of the Related Art A diversity receiver is known as a means for reducing the influence of fading in wireless communication, but it is used in mobile communication, especially car telephones and mobile phones, in which deep fading occurs due to the movement of a local station or a partner station. It has been widely used in base station radio equipment for mobile communication such as a telephone, and has recently come to be used also in a mobile station which is required to be downsized.
【０００３】最も一般的なダイバーシティ受信機は、複
数のアンテナと各アンテナに対し各々の受信部を有し、
同受信部の出力を適当な、例えば受信電界強度が高い側
等、条件で選択または合成して受信出力を得る検波後合
成形のものである。しかし、この検波後合成形には、受
信部が複数必要となり、構成が複雑で大型になり、高価
となる等の欠点がある。The most common diversity receiver has a plurality of antennas and a receiver for each antenna,
This is a post-detection synthesis type that obtains a reception output by selecting or synthesizing the output of the receiving unit under an appropriate condition, for example, on the side where the received electric field strength is high. However, the post-detection synthesis type has a drawback that a plurality of receiving sections are required, the configuration is complicated, the size becomes large, and the cost becomes high.
【０００４】そこで、これらの欠点を解決するため、単
一の受信部と複数のアンテナを有し、適当な条件でアン
テナを適宜切り換えて受信する、アンテナ切換型のダイ
バーシティ受信機も提案されている。In order to solve these drawbacks, therefore, an antenna switching type diversity receiver has been proposed which has a single receiving section and a plurality of antennas, and switches the antennas appropriately under appropriate conditions to receive. .
【０００５】以下、図面を参照しながら、従来のダイバ
ーシティ受信機について説明を行う。図６は、従来のア
ンテナ切換型のダイバーシティ受信機のブロック図であ
る。図６において、６１、６２はアンテナ、６３はアン
テナ６１またはアンテナ６２を選択出力するアンテナ切
換器、６４はアンテナ切換器６３に接続され、アンテナ
６１またはアンテナ６２を介して、所望の電波を受信
し、復調して出力する受信部である。Hereinafter, a conventional diversity receiver will be described with reference to the drawings. FIG. 6 is a block diagram of a conventional antenna switching type diversity receiver. In FIG. 6, reference numerals 61 and 62 are antennas, 63 is an antenna switching device that selectively outputs the antenna 61 or the antenna 62, and 64 is connected to the antenna switching device 63 and receives desired radio waves via the antenna 61 or the antenna 62. , A receiver for demodulating and outputting.
【０００６】６５は、受信部６４の出力から受信電界強
度の瞬時値を検出する受信電界強度検出手段である。６
６は一定時間毎に時間タイミング信号を発生させるタイ
ミング信号発生手段である。６７はタイミング信号発生
手段６６から起動され、受信電界強度検出手段６５が出
力する受信電界強度が、あるしきい値以下となった場合
にアンテナ切換器６３を制御し、現在アンテナ６１が接
続されているならばアンテナ６２に、現在アンテナ６２
が接続されているならばアンテナ６１に切り換えを行う
アンテナ切換判定手段である。Reference numeral 65 is a receiving electric field strength detecting means for detecting an instantaneous value of the receiving electric field strength from the output of the receiving section 64. 6
Reference numeral 6 is a timing signal generating means for generating a time timing signal at regular time intervals. 67 is activated by the timing signal generating means 66, controls the antenna switching unit 63 when the received electric field strength output from the received electric field strength detecting means 65 is below a certain threshold value, and the antenna 61 is currently connected. If there is an antenna 62, the current antenna 62
Is an antenna switching determination means for switching to the antenna 61 if is connected.
【０００７】以上のように構成された従来のアンテナ切
換形のダイバーシティ受信機について、以下その動作を
説明する。図７は従来のダイバーシティ受信機の動作説
明図である。図７において、７１はアンテナ６１におけ
る受信電界強度、７２はアンテナ６２における受信電界
強度、７３はアンテナ切換判定手段６７を起動するため
にタイミング信号発生手段６６より出力されるタイミン
グ信号である。The operation of the conventional antenna switching type diversity receiver configured as described above will be described below. FIG. 7 is an operation explanatory diagram of the conventional diversity receiver. In FIG. 7, reference numeral 71 is a received electric field strength at the antenna 61, 72 is a received electric field strength at the antenna 62, and 73 is a timing signal output from the timing signal generating means 66 for activating the antenna switching determination means 67.
【０００８】いま、アンテナ６１が接続され、受信中に
フェージングによって受信電界強度が、図７のように変
動し、タイミング信号７３が図７のように与えられたと
き、このタイミングにおいて電界強度検出手段６５の出
力が、アンテナ切換判定手段６７にて設定された受信電
界強度、すなわち切り換えしきい値以下となると、アン
テナ切換器６３に対し切換要求が出力され、アンテナ６
２が接続される。ゆえに受信部６４における電界強度
は、太い曲線となる。アンテナ６１とアンテナ６２との
間隔（受信電波の半波長以上）が十分に確保されていれ
ば、受信電界強度の瞬時値はアンテナ６１とアンテナ６
２とで相関が低くなり、一方のアンテナの受信電界強度
が極めて低いときには、他方のアンテナの受信電界強度
の方がより高くなっている確率が高い。従って、より受
信電界強度が高い側の受信電界強度が選択される確率が
高く、ダイバーシティの無い受信機よりも良好な受信出
力が得られる。Now, when the antenna 61 is connected and the received electric field strength fluctuates as shown in FIG. 7 due to fading during reception, and the timing signal 73 is given as shown in FIG. 7, the electric field strength detecting means at this timing. When the output of 65 becomes equal to or lower than the reception electric field intensity set by the antenna switching determination means 67, that is, the switching threshold value or less, a switching request is output to the antenna switching device 63 and the antenna 6
2 are connected. Therefore, the electric field strength in the receiving unit 64 becomes a thick curve. If the distance between the antenna 61 and the antenna 62 (half a wavelength of the received radio wave or more) is sufficiently secured, the instantaneous value of the received electric field strength is the antenna 61 and the antenna 6.
When the received electric field strength of one antenna is extremely low, the probability of the received electric field strength of the other antenna being higher is higher. Therefore, there is a high probability that the reception electric field strength on the side with a higher reception electric field strength will be selected, and a better reception output can be obtained than a receiver without diversity.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、従来の
ダイバーシティ受信機では、混信中や外来ノイズ発生時
に、受信電界強度とデータエラー率の相関関係が崩れて
も、受信電界強度のみをアンテナ切り換えの条件として
おり、アンテナ切り換え判定を行うタイミングにおいて
受信電界強度がしきい値を上回っていれば、データエラ
ー率が高くても、アンテナの切り換えが行われない。逆
に、受信電界強度がしきい値を下回っていれば、データ
エラー率が低くても、アンテナの切り換え動作を行って
しまい、アンテナ切り換え以前よりデータ通信品質が低
下する可能性があった。However, in the conventional diversity receiver, even when the correlation between the received electric field strength and the data error rate is broken during interference or when external noise occurs, only the received electric field strength is a condition for switching the antenna. Therefore, if the received electric field strength exceeds the threshold value at the timing of performing the antenna switching determination, the antenna switching is not performed even if the data error rate is high. On the other hand, if the received electric field strength is below the threshold value, the antenna switching operation is performed even if the data error rate is low, and the data communication quality may be lower than that before the antenna switching.
【００１０】そこで本発明では、混信中や外来ノイズ発
生時においても、通信品質を落とさずにダイバーシティ
利得を向上させることが可能な、小型で簡易なダイバー
シティ受信機を提供することを目的とする。Therefore, it is an object of the present invention to provide a small and simple diversity receiver capable of improving the diversity gain without deteriorating the communication quality even during the interference or when the external noise occurs.
【００１１】[0011]
【課題を解決するための手段】本発明のダイバーシティ
受信機は、複数のアンテナと、複数のアンテナの１つを
選択出力するアンテナ切換器と、アンテナ切換器に接続
され、変調された電波を復調する受信部と、受信部の復
調信号から受信電界強度の瞬時値を検出する受信電界強
度検出手段と、データのビット誤りを検出するビットエ
ラー検出手段と、ビット誤り検出手段の出力を記憶保持
し、ビットエラーの割合を検出するビットエラー率測定
手段と、適当な時間タイミング信号を発生させる手段
と、受信電界強度検出手段とビットエラー率測定手段の
出力を受け、受信電界強度の瞬時値が定義されたしきい
値より低下しても、ビットエラー率がしきい値以下であ
れば、アンテナ切換器にアンテナ切換信号を出力しない
アンテナ切換判定手段を有する。A diversity receiver of the present invention includes a plurality of antennas, an antenna switching device for selectively outputting one of the plurality of antennas, and an antenna switching device for demodulating a modulated radio wave. A receiving unit, a receiving electric field intensity detecting unit that detects an instantaneous value of the receiving electric field intensity from the demodulated signal of the receiving unit, a bit error detecting unit that detects a bit error of data, and an output of the bit error detecting unit. , Bit error rate measuring means for detecting a bit error rate, means for generating an appropriate time timing signal, receiving electric field strength detecting means and bit error rate measuring means, and an instantaneous value of the received electric field strength is defined. If the bit error rate is below the threshold even if it falls below the specified threshold, the antenna switching judgment procedure that does not output the antenna switching signal to the antenna switching device. Having.
【００１２】上記構成により、混信中や外来ノイズの発
生時、すなわち受信電界強度とビットエラー率の相関関
係が崩れた場合、受信データのビットエラー率を加味し
てアンテナの切り換えを行うため、通信品質を劣化させ
ることなくダイバーシティー利得を向上させることが可
能になった。With the above configuration, when the interference is generated or when external noise occurs, that is, when the correlation between the received electric field strength and the bit error rate is broken, the antenna is switched in consideration of the bit error rate of the received data. It has become possible to improve diversity gain without degrading quality.
【００１３】[0013]
（実施の形態１）以下、本発明の第１の実施の形態につ
いて、図面を参照しながら説明する。Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
【００１４】図１は、本発明の第１の実施の形態におけ
るダイバーシティ受信機のブロック図、図２は同形態に
おけるアンテナ選択処理の概要を示すフローチャート、
図３は本発明の第２の実施の形態におけるアンテナ選択
処理の概要を示すフローチャート、図４は本発明の第１
の実施の形態におけるアンテナ切換判定基準となる受信
電界強度とビットエラー率の関係図である。FIG. 1 is a block diagram of a diversity receiver according to the first embodiment of the present invention, and FIG. 2 is a flowchart showing an outline of antenna selection processing in the same embodiment,
FIG. 3 is a flow chart showing an outline of antenna selection processing in the second embodiment of the present invention, and FIG. 4 is a first flow chart of the present invention.
FIG. 7 is a relationship diagram between a received electric field strength and a bit error rate, which are antenna switching determination criteria in the embodiment of the present invention.
【００１５】図１において、１１および１２はアンテ
ナ、１３はアンテナ１１またはアンテナ１２を選択出力
するアンテナ切換器、１４はアンテナ切換器１３により
接続されたアンテナ１１またはアンテナ１２を介して、
所望の電波を受信し復調して出力する受信部である。In FIG. 1, 11 and 12 are antennas, 13 is an antenna switching device for selectively outputting the antenna 11 or 12, and 14 is the antenna 11 or 12 connected by the antenna switching device 13.
The receiving unit receives a desired radio wave, demodulates it, and outputs it.
【００１６】１５は受信部１４の復調信号から受信電界
強度の瞬時値を検出する受信電界強度検出手段、１６は
同じく受信部１４の復調信号から受信データのビット誤
りを検出するビット誤り検出手段である。１７はビット
誤り検出手段１６によって検出されるデータビット誤り
を記憶保持し、ビットエラー率を検出するビットエラー
率測定手段である。Reference numeral 15 is a received electric field strength detecting means for detecting an instantaneous value of the received electric field strength from the demodulated signal of the receiving section 14, and 16 is a bit error detecting means for detecting a bit error of the received data from the demodulated signal of the receiving section 14. is there. Reference numeral 17 is a bit error rate measuring means for storing and holding the data bit error detected by the bit error detecting means 16 and detecting the bit error rate.
【００１７】１８は適当な周期毎に時間タイミング信号
を発生させるタイミング信号発生手段であり、最近のデ
ジタル携帯電話や第二世代コードレス電話等で使用され
る時分割多元接続、又は時分割複信によって送信波がバ
ースト波である場合、受信部１４からバーストとバース
トの間またはバースト先頭のタイミングを取り出しても
良い。１９はアンテナ切換判定手段であり、受信電界強
度の瞬時値がしきい値以下となった場合、ビットエラー
率が低い場合はアンテナ切換信号を出力せず、ビットエ
ラー率が高い場合は、アンテナ切換信号をアンテナ切換
器１３に送出し、現在アンテナ１１が接続されているな
らばアンテナ１２に、現在アンテナ１２が接続されてい
るならばアンテナ１１に切り換える。Numeral 18 is a timing signal generating means for generating a time timing signal at every suitable cycle, by means of time division multiple access or time division duplex used in recent digital portable telephones, second generation cordless telephones and the like. When the transmission wave is a burst wave, the timing between bursts or between bursts may be extracted from the reception unit 14. Reference numeral 19 denotes an antenna switching determination means, which does not output an antenna switching signal when the instantaneous value of the received electric field strength is less than or equal to a threshold value, when the bit error rate is low, and when the bit error rate is high. The signal is sent to the antenna switching unit 13, and the antenna 12 is switched if the antenna 11 is currently connected, and the antenna 11 is switched if the antenna 12 is currently connected.
【００１８】次にデータ受信からアンテナ切換を行うま
での工程を、図２のフローチャートに従って説明する。Next, steps from data reception to antenna switching will be described with reference to the flowchart of FIG.
【００１９】アンテナ１１又はアンテナ１２は、所望の
電波を受信し（ステップ１０１）、受信電界強度検出手
段１５は、受信電界強度の大きさの検知を開始する（ス
テップ１０２）。The antenna 11 or the antenna 12 receives a desired radio wave (step 101), and the reception electric field strength detection means 15 starts detecting the magnitude of the reception electric field strength (step 102).
【００２０】受信部１４により、受信した電波は復調さ
れ（ステップ１０３）、復調された受信データより、ビ
ット誤り検出手段１６はビット誤り量を出力する。ビッ
ト誤り検出手段１６の出力に基づいて、ビットエラー率
測定手段１７でビットエラー率が検出される（ステップ
１０４）。The receiving section 14 demodulates the received radio wave (step 103), and the bit error detecting means 16 outputs the bit error amount from the demodulated received data. Based on the output of the bit error detection means 16, the bit error rate measurement means 17 detects the bit error rate (step 104).
【００２１】タイミング信号発生手段１８よりアンテナ
切換判定手段１９を起動するように信号が発信されると
（ステップ１０５）、アンテナ切換判定手段１９は、受
信電界強度検出手段１５から現在の受信電界強度の大き
さを読み出し、定義されたしきい値と比較し、受信電界
強度がしきい値より下回っていないかを判定する（ステ
ップ１０６）。When a signal is transmitted from the timing signal generating means 18 so as to activate the antenna switching determining means 19 (step 105), the antenna switching determining means 19 causes the reception electric field strength detecting means 15 to detect the current reception electric field strength. The magnitude is read and compared with a defined threshold value to determine whether the received electric field strength is below the threshold value (step 106).
【００２２】受信電界強度がしきい値より低い場合、ビ
ットエラー率測定手段１７によりビットエラー率を読み
出し、アンテナの切換の判定を行う（ステップ１０
７）。その際、受信電界強度がしきい値より低い場合で
も、ビットエラー率がしきい値以下であればアンテナ切
換信号は出力せず、ビットエラー率がしきい値以上であ
れば、アンテナの切換を行うと判定し、アンテナ切換器
１３にアンテナ切換信号を送出する（ステップ１０
８）。以上のように出力されるアンテナ切換信号によ
り、アンテナ切換器１３が制御される。When the received electric field strength is lower than the threshold value, the bit error rate measuring means 17 reads the bit error rate and determines the antenna switching (step 10).
7). At that time, even if the received electric field strength is lower than the threshold value, if the bit error rate is less than the threshold value, the antenna switching signal is not output, and if the bit error rate is more than the threshold value, the antenna switching is performed. If it is determined to be performed, an antenna switching signal is sent to the antenna switching device 13 (step 10).
8). The antenna switching device 13 is controlled by the antenna switching signal output as described above.
【００２３】次に、アンテナ切換判定となる受信電界強
度とビットエラー率を比較、判定を行う工程を、図４を
参照しながら説明する。図４において、１はアンテナ１
１における受信電界強度、２はアンテナ１２における受
信電界強度、３はアンテナ切換判定手段１９を起動する
ために、タイミング信号発生手段１８より出力されるタ
イミング信号である。４はビットエラー率測定手段１７
より出力されるアンテナ１１のビットエラー率、５はア
ンテナ１２のビットエラー率である。Next, the process of comparing the received electric field strength and the bit error rate, which is the antenna switching judgment, and making the judgment will be described with reference to FIG. In FIG. 4, 1 is an antenna 1.
The received electric field strength at 1 is 2, the received electric field strength at the antenna 12, and 3 is a timing signal output from the timing signal generating means 18 for activating the antenna switching determination means 19. 4 is a bit error rate measuring means 17
The bit error rate of the antenna 11 that is output by 5 is the bit error rate of the antenna 12.
【００２４】いま、アンテナ１１が接続され、受信中に
フェージングによって受信電界強度が図４のように変動
し、タイミング信号３が図４のように与えられたとき、
このタイミングにおいて受信電界強度の瞬時値が、アン
テナ切換判断手段１９にて設定された受信電界強度、す
なわち切り換えしきい値以下になると、同一タイミング
におけるビットエラー率を参照し、ビットエラー率がし
きい値以下であればアンテナ切換信号は出力されず、ア
ンテナ１１が接続されたままになる。以上のように、フ
ェージングによって、受信電界強度が低下しても、ビッ
トエラー率を加味することにより、無効なアンテナ切換
を少なくすることができる。Now, when the antenna 11 is connected and the received electric field strength fluctuates as shown in FIG. 4 due to fading during reception, and the timing signal 3 is given as shown in FIG.
At this timing, when the instantaneous value of the received electric field strength becomes equal to or less than the received electric field strength set by the antenna switching judgment means 19, that is, the switching threshold value or less, the bit error rate at the same timing is referred to and the bit error rate is threshold. If the value is less than the value, the antenna switching signal is not output and the antenna 11 remains connected. As described above, even if the received electric field strength decreases due to fading, it is possible to reduce invalid antenna switching by adding the bit error rate.
【００２５】（実施の形態２）次に第２の実施の形態に
ついて説明する。ブロック構成は図１と同様である。本
実施の形態２においては、受信電界強度の瞬時値がしき
い値を上回っている場合、ビットエラー率が低い場合は
アンテナ切換信号を出力せず、ビットエラー率が高い場
合は、アンテナ切換判定手段１９からアンテナ切換信号
をアンテナ切換器１３に送出し、アンテナを切り換え
る。以下、図３のフローチャートに従って詳細を述べ
る。(Second Embodiment) Next, a second embodiment will be described. The block configuration is the same as in FIG. In the second embodiment, when the instantaneous value of the received electric field strength exceeds the threshold value, the antenna switching signal is not output when the bit error rate is low, and the antenna switching determination is performed when the bit error rate is high. An antenna switching signal is sent from the means 19 to the antenna switching device 13 to switch the antenna. Details will be described below with reference to the flowchart of FIG.
【００２６】アンテナ１１又はアンテナ１２は、所望の
電波を受信し（ステップ１１１）、受信電界強度検出手
段１５は受信電界強度の大きさの検知を開始する（ステ
ップ１１２）。受信部１４により、受信した電波は復調
され（ステップ１１３）、復調された受信データより、
ビット誤り検出手段１６はビット誤り量を出力する。ビ
ット誤り検出手段１６の出力により、ビットエラー率測
定手段１７でビットエラー率が検出される（ステップ１
１４）。The antenna 11 or the antenna 12 receives a desired radio wave (step 111), and the received electric field strength detecting means 15 starts detecting the magnitude of the received electric field strength (step 112). The reception section 14 demodulates the received radio wave (step 113), and based on the demodulated reception data,
The bit error detection means 16 outputs the bit error amount. From the output of the bit error detecting means 16, the bit error rate measuring means 17 detects the bit error rate (step 1).
14).
【００２７】タイミング信号発生手段１８よりアンテナ
切換判定手段１９を起動するように信号が発信されると
（ステップ１１５）、アンテナ切換判定手段１９は、受
信電界強度検出手段１５から現在の受信電界強度の大き
さを読み出し、定義されたしきい値と比較し、受信電界
強度がしきい値を上回っていた場合（ステップ１１
６）、ビットエラー率測定手段１７によりビットエラー
率を読み出し、アンテナの切換の判定を行う（ステップ
１１７）。When a signal is transmitted from the timing signal generation means 18 to activate the antenna switching determination means 19 (step 115), the antenna switching determination means 19 causes the reception field strength detection means 15 to detect the current reception field strength. The magnitude is read out and compared with the defined threshold value, and if the received electric field strength is above the threshold value (step 11
6), the bit error rate measuring means 17 reads the bit error rate, and determines the switching of the antenna (step 117).
【００２８】その際、受信電界強度がしきい値より高い
場合でも、ビットエラー率がしきい値以上であればアン
テナ切換信号を出力し（ステップ１１８）、ビットエラ
ー率がしきい値以下であれば、アンテナの切換信号の送
出は行わない。以上のように出力されるアンテナ切換信
号により、アンテナ切換器１３が制御される。At this time, even if the received electric field strength is higher than the threshold value, if the bit error rate is higher than the threshold value, an antenna switching signal is output (step 118) and the bit error rate is lower than the threshold value. For example, the antenna switching signal is not transmitted. The antenna switching device 13 is controlled by the antenna switching signal output as described above.
【００２９】次にアンテナ切換判定となる受信電界強度
とビットエラー率を比較、判定を行う工程を図５参照し
ながら説明する。Next, the process of comparing the received electric field strength and the bit error rate, which is the antenna switching judgment, and making the judgment will be described with reference to FIG.
【００３０】いま、アンテナ１２が接続され、受信中に
フェージングによって受信電界強度が図５のように変動
し、タイミング信号３が図５のように与えられたとき、
このタイミングにおいて受信電界強度の瞬時値が、アン
テナ切換判定手段１９にて設定された受信電界強度、す
なわち切り換えしきい値を下回ると判定されたとして
も、同一タイミングにおけるビットエラー率がしきい値
以上であればアンテナ切換信号が出力され、アンテナ切
換器１３が制御され、アンテナ１１に切り換わる。Now, when the antenna 12 is connected and the received electric field strength fluctuates as shown in FIG. 5 due to fading during reception, and the timing signal 3 is given as shown in FIG. 5,
Even if it is determined at this timing that the instantaneous value of the received electric field strength is below the received electric field strength set by the antenna switching determination means 19, that is, the switching threshold value, the bit error rate at the same timing is equal to or more than the threshold value. If so, an antenna switching signal is output, the antenna switching device 13 is controlled, and the antenna 11 is switched.
【００３１】以上のような構成を採り、先に示した判定
基準によりアンテナ制御を行うことで、受信電界強度に
よるアンテナ切換判定のみに頼らず、ビットエラー率を
加味したアンテナ選択を行うことができる。したがっ
て、混信中や外来ノイズの影響を低減し、ダイバーシテ
ィ利得の低下を補償し、有効な受信結果を得ることがで
きる。By adopting the above-mentioned configuration and performing the antenna control according to the above-mentioned criteria, it is possible to perform the antenna selection in consideration of the bit error rate without depending only on the antenna switching determination based on the received electric field strength. . Therefore, it is possible to reduce the influence of interference and external noise, compensate for the decrease in diversity gain, and obtain an effective reception result.
【００３２】[0032]
【発明の効果】本発明によれば、混信中や外来ノイズの
発生時、すなわち受信電界強度とビットエラー率の相関
関係が崩れた場合でも、通信品質を劣化させることなく
ダイバーシティー利得を有する受信機を実現することが
できる。したがって、回折や反射の多い環境条件下での
アンテナ制御においても、良好な特性を保持することが
できる。According to the present invention, even when interference occurs or external noise occurs, that is, even when the correlation between the reception electric field strength and the bit error rate is broken, reception having diversity gain without degrading communication quality is achieved. Machine can be realized. Therefore, it is possible to maintain good characteristics even in the antenna control under environmental conditions where there are many diffractions and reflections.
【図１】本発明の第１の実施の形態におけるダイバーシ
ティ受信機のブロック図FIG. 1 is a block diagram of a diversity receiver according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態におけるアンテナ選
択処理の概要を示すフローチャートFIG. 2 is a flowchart showing an outline of antenna selection processing according to the first embodiment of the present invention.
【図３】本発明の第２の実施の形態におけるアンテナ選
択処理の概要を示すフローチャートFIG. 3 is a flowchart showing an outline of antenna selection processing according to the second embodiment of the present invention.
【図４】本発明の第１の実施の形態におけるアンテナ切
換判定基準となる受信電界強度とビットエラー率の関係
図FIG. 4 is a diagram showing the relationship between the received electric field strength and the bit error rate, which are the antenna switching determination criteria in the first embodiment of the present invention.
【図５】本発明の第２の実施の形態におけるアンテナ切
換判定基準となる受信電界強度とビットエラー率の関係
図FIG. 5 is a diagram showing a relation between a received electric field strength and a bit error rate, which is an antenna switching determination reference according to the second embodiment of the present invention.
【図６】従来のアンテナ切換型のダイバーシティ受信機
のブロック図FIG. 6 is a block diagram of a conventional antenna switching type diversity receiver.
【図７】従来のダイバーシティ受信機の動作説明図FIG. 7 is an operation explanatory diagram of a conventional diversity receiver.
１１、１２ アンテナ １３ アンテナ切換器 １４ 受信部 １５ 受信電界強度検出手段 １６ ビット誤り検出手段 １７ ビットエラー率測定手段 １８ タイミング信号発生手段 １９ アンテナ切換判定手段 11, 12 antennas 13 antenna switching device 14 receiving unit 15 reception electric field strength detecting means 16 bit error detecting means 17 bit error rate measuring means 18 timing signal generating means 19 antenna switching judging means
Claims (2)
１つを選択出力するアンテナ切換器と、前記アンテナ切
換器に接続され、変調された電波を復調する受信部と、
前記受信部の復調信号から受信電界強度の瞬時値を検出
する受信電界強度検出手段と、データのビット誤りを検
出するビットエラー検出手段と、前記ビット誤り検出手
段の出力を記憶保持し、ビットエラーの割合を検出する
ビットエラー率測定手段と、適当な時間タイミング信号
を発生させる手段と、前記受信電界強度検出手段と前記
ビットエラー率測定手段の出力を受け、受信電界強度の
瞬時値が定義されたしきい値より低下しても、ビットエ
ラー率がしきい値以下であれば、前記アンテナ切換器に
アンテナ切換信号を出力しないアンテナ切換判定手段を
有するダイバーシティ受信機。1. A plurality of antennas, an antenna switching device that selectively outputs one of the plurality of antennas, and a receiving unit that is connected to the antenna switching device and demodulates modulated radio waves.
Received electric field strength detecting means for detecting an instantaneous value of the received electric field strength from the demodulated signal of the receiving part, bit error detecting means for detecting a bit error of data, and output of the bit error detecting means are stored and held, and a bit error is stored. Bit error rate measuring means for detecting the ratio, a means for generating an appropriate time timing signal, an output of the receiving electric field strength detecting means and the bit error rate measuring means, and an instantaneous value of the receiving electric field strength is defined. A diversity receiver having an antenna switching determination means that does not output an antenna switching signal to the antenna switching device if the bit error rate is equal to or lower than the threshold even if the bit error rate falls below the threshold.
１つを選択出力するアンテナ切換器と、前記アンテナ切
換器に接続され、変調された電波を復調する受信部と、
前記受信部の復調信号から受信電界強度の瞬時値を検出
する受信電界強度検出手段と、データのビット誤りを検
出するビットエラー検出手段と、前記ビット誤り検出手
段の出力を記憶保持し、ビットエラーの割合を検出する
ビットエラー率測定手段と、適当な時間タイミング信号
を発生させる手段と、前記受信電界強度検出手段と前記
ビットエラー率測定手段の出力を受け、受信電界強度の
瞬時値がしきい値を上回る場合も、ビットエラー率がし
きい値を上回る場合、前記アンテナを切り換えるように
判定し、前記アンテナ切換器にアンテナ切換信号を出力
する機能を持つアンテナ切換判定手段を有することを特
徴とするダイバーシティ受信機。2. An antenna, a plurality of antennas, an antenna selector for selectively outputting one of the plurality of antennas, and a receiver connected to the antenna selector for demodulating a modulated radio wave.
Received electric field strength detecting means for detecting an instantaneous value of the received electric field strength from the demodulated signal of the receiving part, bit error detecting means for detecting a bit error of data, and output of the bit error detecting means are stored and held, and a bit error is stored. The bit error rate measuring means for detecting the ratio, the means for generating an appropriate time timing signal, the output of the receiving electric field strength detecting means and the bit error rate measuring means, and the instantaneous value of the receiving electric field strength is determined by the threshold value. When the bit error rate exceeds the threshold value even when the value exceeds the value, it is characterized by having an antenna switching determination means having a function of determining to switch the antenna and outputting an antenna switching signal to the antenna switching device. Diversity receiver to do.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8002001A JPH09191305A (en) | 1996-01-10 | 1996-01-10 | Diversity receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8002001A JPH09191305A (en) | 1996-01-10 | 1996-01-10 | Diversity receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09191305A true JPH09191305A (en) | 1997-07-22 |
Family
ID=11517195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8002001A Pending JPH09191305A (en) | 1996-01-10 | 1996-01-10 | Diversity receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09191305A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314276C (en) * | 2001-12-31 | 2007-05-02 | 中兴通讯股份有限公司 | Method and device for realizing digital selection diversity |
| JP6414278B1 (en) * | 2017-06-01 | 2018-10-31 | オムロン株式会社 | Wireless communication system and communication failure cause estimation program |
-
1996
- 1996-01-10 JP JP8002001A patent/JPH09191305A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314276C (en) * | 2001-12-31 | 2007-05-02 | 中兴通讯股份有限公司 | Method and device for realizing digital selection diversity |
| JP6414278B1 (en) * | 2017-06-01 | 2018-10-31 | オムロン株式会社 | Wireless communication system and communication failure cause estimation program |
| JP2018207249A (en) * | 2017-06-01 | 2018-12-27 | オムロン株式会社 | Radio communication system and communication failure cause estimation program |
| US10447528B2 (en) | 2017-06-01 | 2019-10-15 | Omron Corporation | Radio communication system and non-transitory computer-readable storage medium |
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