JP4795057B2

JP4795057B2 - Receiver

Info

Publication number: JP4795057B2
Application number: JP2006064491A
Authority: JP
Inventors: 敦間瀬
Original assignee: Hitachi Kokusai Electric Inc
Current assignee: Hitachi Kokusai Electric Inc
Priority date: 2006-03-09
Filing date: 2006-03-09
Publication date: 2011-10-19
Anticipated expiration: 2026-03-09
Also published as: JP2007243700A

Description

この発明は、例えば、消防・救急向けデジタル無線システムにおける移動局に備えられる受信装置に関するものである。 The present invention relates to a receiver provided in a mobile station in a digital radio system for fire fighting and emergency, for example.

近年、地域防災無線システムや列車、タクシー等の業務用無線システムなど多くの無線システムでデジタル化が進んでいる。現在、消防・救急用の無線システムも、ＴＤＭＡ（Time Division Multiple Access）方式やＳＣＰＣ（Single Channel Per Carrier）方式を採用したデジタル化が進められている。 In recent years, digitization has progressed in many wireless systems such as regional disaster prevention wireless systems and commercial wireless systems such as trains and taxis. At present, the radio system for fire fighting / emergency is being digitized by adopting the TDMA (Time Division Multiple Access) method and the SCPC (Single Channel Per Carrier) method.

また、消防・救急用の無線システムでは、移動局がビル影等のマルチパス環境下に存在する場合でも、安定した通信の品質を提供できるように、無線システムを構成する基地局無線機及び移動局無線機の受信装置に伝搬路におけるフェージング等の影響を軽減するための等化処理手段が組み込まれている（例えば、特許文献１を参照。）。 In addition, in the radio system for fire fighting / emergency, even if the mobile station exists in a multipath environment such as a building shadow, the base station radio and mobile stations that make up the radio system can provide stable communication quality. An equalization processing means for reducing the influence of fading or the like in the propagation path is incorporated in the receiving device of the station radio (see, for example, Patent Document 1).

特開２０００−６８９１０公報JP 2000-68710 A

ところが、この等化処理を行うと弱電界における受信性能が劣化することも周知である。例えば、基地局から離れた受信強度の低い場所では、等化処理を行うことでさらに受信電界強度が低下し通信できなくなってしまう場合がある。消防・救急用の無線システムでは緊急性を要するため、通信エリアはなるべく広く確保できるのが望ましい。 However, it is also well known that the reception performance in a weak electric field deteriorates when this equalization processing is performed. For example, in a place where the reception strength is low, away from the base station, the reception electric field strength may further decrease due to the equalization process, and communication may not be possible. Since a fire fighting / emergency radio system requires urgency, it is desirable to ensure a wide communication area.

この発明は上記事情に着目してなされたもので、その目的とするところは、通信エリアを広く確保すると共に通信品質を向上させることができる受信装置を提供することにある。 The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a receiving apparatus capable of ensuring a wide communication area and improving communication quality.

上記目的を達成するためにこの発明に係わる受信装置は、無線回線を介して到来する無線信号を受信する受信手段と、前記受信された無線信号から受信電界強度を検出する検出手段と、前記受信された無線信号の波形等化処理を行う等化処理手段と、前記検出された受信電界強度を閾値と比較し、前記検出された受信電界強度が一定時間以上閾値より小さいか否かを判定する判定手段と、前記判定手段により前記検出された受信電界強度が閾値より大きいと判定された場合には、前記等化処理手段を動作させ、前記判定手段により前記検出された受信電界強度が一定時間以上閾値より小さいと判定された場合に前記等化処理手段を停止させる制御手段とを具備することを特徴とする。 In order to achieve the above object, a receiving apparatus according to the present invention comprises a receiving means for receiving a radio signal arriving via a radio line, a detecting means for detecting a received electric field intensity from the received radio signal, and the receiving Equalization processing means for performing waveform equalization processing of the received radio signal, and comparing the detected received electric field strength with a threshold value to determine whether or not the detected received electric field strength is smaller than the threshold value for a certain time or more If the determination means and the determination means determine that the detected received electric field strength is greater than a threshold value, the equalization processing means is operated, and the received electric field strength detected by the determination means is a predetermined time. Control means for stopping the equalization processing means when determined to be smaller than the threshold value as described above.

上記構成では、等化処理を実行するか否かを切り替える手段を備え、受信電界強度が閾値以上の場合には等化処理を実行し、受信電界強度が閾値より低い場合には等化処理を実行しないようにしている。このように構成することにより、常に等化処理を行っている場合に比べてより低い電界強度のエリアにおいても良好な通信品質を確保することができる。 In the above configuration, a means for switching whether or not to perform the equalization process is provided, the equalization process is performed when the received electric field strength is equal to or greater than the threshold value, and the equalization process is performed when the received electric field strength is lower than the threshold value. Do not run. By configuring in this way, it is possible to ensure good communication quality even in an area having a lower electric field strength than in the case where equalization processing is always performed.

またこの発明に係わる車載向け受信装置は、車載用の第１の受信機と、前記第１の受信機に対し着脱自在に取着される携帯用の第２の受信機とを具備する車載向け受信装置であって、前記第１の受信機は、無線回線を介して到来する無線信号を受信する第１の受信手段と、前記受信された無線信号から受信電界強度を検出する第１の検出手段と、前記検出された受信電界強度を閾値と比較し、前記検出された受信電界強度が一定時間以上閾値より小さいか否かを判定する第１の判定手段と、第１の時間応答特性に従い波形等化処理を行う第１の等化処理手段と、前記判定手段により前記検出された受信電界強度が閾値より大きいと判定された場合には、前記第１の等化処理手段を動作させ、前記判定手段により前記検出された受信電界強度が一定時間以上閾値より小さいと判定された場合に前記第１の等化処理手段を停止させる第１の制御手段とを備える。また、前記第２の受信機は、前記無線回線を介して到来する無線信号を受信する第２の受信手段と、前記受信された無線信号から受信電界強度を検出する第２の検出手段と、前記検出された受信電界強度を閾値と比較し、前記検出された受信電界強度が閾値より小さいか否かを判定する第２の判定手段と、前記第１の時間応答特性より遅い第２の時間応答特性に従い波形等化処理を行う第２の等化処理手段と、前記判定手段により前記検出された受信電界強度が閾値より大きいと判定された場合には、前記第２の等化処理手段を動作させ、前記判定手段により前記検出された受信電界強度が閾値より小さいと判定された場合に前記第２の等化処理手段を停止させる第２の制御手段とを備えるものである。 A vehicle-mounted receiving device according to the present invention includes a vehicle-mounted first receiver and a portable second receiver that is detachably attached to the first receiver. A first receiver that receives a wireless signal that arrives via a wireless line; and a first detector that detects a received electric field strength from the received wireless signal. A first determination means for comparing the detected received electric field strength with a threshold value and determining whether the detected received electric field strength is smaller than the threshold value for a certain time or more, and according to a first time response characteristic. A first equalization processing means for performing a waveform equalization process; and if the received electric field strength detected by the determination means is determined to be greater than a threshold, operate the first equalization processing means, The received electric field strength detected by the determining means is And a first control means for said first equalization means is stopped when it is determined to be smaller than the constant time or more thresholds. In addition, the second receiver includes a second receiving unit that receives a radio signal arriving via the radio line, a second detecting unit that detects a received electric field strength from the received radio signal, A second determination means for comparing the detected received electric field strength with a threshold and determining whether the detected received electric field strength is smaller than the threshold; and a second time later than the first time response characteristic Second equalization processing means for performing waveform equalization processing according to response characteristics; and when the determination means determines that the detected received electric field strength is greater than a threshold value, the second equalization processing means And a second control unit that is operated and stops the second equalization processing unit when the determination unit determines that the detected received electric field strength is smaller than a threshold value.

上記構成では、高速フェージング用の等化器に対しては一定時間以上受信電界強度の低下が検出された場合に等化処理を停止させる。これに対して低速フェージング用の等化器の場合には受信電界強度の低下が検出されるとすぐに等化処理を停止させるようにしている。このように、等化器の時間応答特性に応じた等化処理の制御を行うことで、常に通信品質をより良好に保つことが可能となる。 In the above configuration, the equalization processing is stopped when a decrease in the received electric field strength is detected for a certain time or more with respect to the equalizer for high-speed fading. On the other hand, in the case of an equalizer for low-speed fading, the equalization process is stopped as soon as a decrease in received electric field strength is detected. Thus, by controlling the equalization process according to the time response characteristic of the equalizer, it is possible to always maintain better communication quality.

したがってこの発明によれば、通信エリアを広く確保すると共に通信品質を向上させることができる受信装置を提供することができる。 Therefore, according to the present invention, it is possible to provide a receiving apparatus that can ensure a wide communication area and improve communication quality.

以下、図面を参照してこの発明の実施形態について詳細に説明する。
図１は、消防・救急用無線システムの一実施形態を示す概略図である。
基地局ゾーン１０１は無線基地局１０２の無線エリアを示している。消防署署隊本部１０３に備えられる遠隔制御器１０４は無線基地局１０２に接続されており、基地局無線機の制御を行う。移動局１０５，１０６，１０７は、消防車や救急車に搭載される車載無線機や携帯無線機である。遠隔制御器１０４からは、無線基地局１０２を介して基地局ゾーン１０１内の移動局１０５，１０６，１０７に対して一斉通信、個別通信を行うことができる。移動局１０５，１０６，１０７は、無線基地局１０２を介して遠隔制御器１０４との通信（基地局通信）や他の移動局との通信（移動局間通信）を行うことができる。また、移動局同士は無線基地局１０２を介さずに専用の周波数帯を使用して通信（移動局間直接通信）を行うこともできる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of a fire fighting / emergency radio system.
A base station zone 101 indicates a radio area of the radio base station 102. A remote controller 104 provided in the fire department corps headquarters 103 is connected to the radio base station 102 and controls the base station radio. The mobile stations 105, 106, and 107 are in-vehicle wireless devices and portable wireless devices mounted on fire engines and ambulances. The remote controller 104 can perform simultaneous communication and individual communication to the mobile stations 105, 106, and 107 in the base station zone 101 via the wireless base station 102. The mobile stations 105, 106, and 107 can perform communication with the remote controller 104 (base station communication) and communication with other mobile stations (communication between mobile stations) via the radio base station 102. In addition, mobile stations can perform communication (direct communication between mobile stations) using a dedicated frequency band without going through the radio base station 102.

このように、消防・救急用無線システムには、上述のような遠隔制御器１０４や無線基地局１０２が少なくとも１つ配置される。各無線基地局１０２は、無線回線制御装置１０８を介して警防本部１０９や方面本部１１１とも接続されており、警防本部１０９の災害緊急管制台１１０や方面本部の遠隔制御器１１２からは各基地局ゾーンの移動局に対して一斉通信や個別通信を行うことができる。 In this way, at least one remote controller 104 or radio base station 102 as described above is arranged in the fire fighting / emergency radio system. Each radio base station 102 is also connected to the security headquarters 109 and the direction headquarters 111 via the radio network controller 108. From the disaster emergency control stand 110 of the security headquarters 109 and the remote controller 112 of the direction headquarters, each base station Simultaneous communication and individual communication can be performed for mobile stations in the zone.

図２は、図１に示す移動局１０５，１０６，１０７に設けられる無線端末の構成の一例を示すブロック図である。
無線端末は、車載無線機２０１、携帯無線機２０２、置台２０３、アンテナ２０４，２０５、スピーカ２０６，２０７、ハンドセット２０８，２０９、及び操作表示器２１０を備える。 FIG. 2 is a block diagram illustrating an example of a configuration of a wireless terminal provided in the mobile stations 105, 106, and 107 illustrated in FIG.
The wireless terminal includes an in-vehicle wireless device 201, a portable wireless device 202, a table 203, antennas 204 and 205, speakers 206 and 207, handsets 208 and 209, and an operation display 210.

この無線端末は、車載無線機２０１と携帯無線機２０２を１組とする１局２装置の構成となっており、携帯無線機２０２が置台２０３に置かれている場合は、車載無線機２０１が無線局となり、携帯無線機２０２が置台２０３に置かれていない場合は、携帯無線機２０２が無線局となる。携帯無線機２０２が無線局となる場合は、車載無線機２０１は送信できないが受信のみ動作可能となる。車両での移動中などは、携帯無線機２０２は置台２０３に置かれており車載無線機２０１が無線局となるが、車外で活動する際などは携帯無線機２０２を置台２０３から持ち出すことにより、車外活動時でも同じ無線局を使用することができる。 This wireless terminal is configured as a one-station / two-device device that includes a vehicle-mounted wireless device 201 and a portable wireless device 202. When the portable wireless device 202 is placed on a table 203, the vehicle-mounted wireless device 201 is When the mobile station 202 is a wireless station and the mobile wireless device 202 is not placed on the table 203, the mobile wireless device 202 is a wireless station. When the portable wireless device 202 is a wireless station, the in-vehicle wireless device 201 cannot perform transmission but can only perform reception. While moving in a vehicle, the portable wireless device 202 is placed on the table 203, and the in-vehicle wireless device 201 becomes a wireless station, but when working outside the vehicle, the portable wireless device 202 is taken out of the table 203, The same radio station can be used even during activities outside the vehicle.

また、車載無線機２０１には、２つのアンテナ２０４，２０５、２つのスピーカ２０６，２０７が接続される。また、ハンドセット２０８，２０９も複数接続可能である。消防・救急無線システムではすべての通信の重要度が高いため、このようにすることで、無線基地局１０２からの通信（基地局通信）と、移動局からの専用波による通信（移動局間直接通信）とを同時に受信、モニタリング可能となる。また、車載無線機２０１には、データ通信の操作や受信データを表示するための操作表示器２１０も接続される。さらにパーソナル・コンピュータ２１１や心電図測定器２１２も接続することができ、心電図等の計測データや様々な情報をデータ通信にて取り込むことができる。 In addition, two antennas 204 and 205 and two speakers 206 and 207 are connected to the in-vehicle wireless device 201. A plurality of handsets 208 and 209 can be connected. In the fire fighting / emergency radio system, all communications are highly important. By doing so, communication from the radio base station 102 (base station communication) and communication using dedicated waves from mobile stations (directly between mobile stations) Communication) can be received and monitored simultaneously. Also, an operation indicator 210 for displaying data communication operations and received data is connected to the in-vehicle wireless device 201. Furthermore, a personal computer 211 and an electrocardiogram measuring device 212 can be connected, and measurement data such as an electrocardiogram and various information can be captured by data communication.

次に、車載無線機２０１及び携帯無線機２０２の構成について説明する。
まず、図３を参照して車載無線機２０１について説明する。車載無線機２０１の送信時、制御部３０１は音声コーデックから音声データやデータ通信用のデータ等の送信データを送信フレーム処理部３０２に送る。送信フレーム処理部は受け取った送信データの誤り訂正符号化等、標準規格等で定められた信号フォーマットに従って信号の組み立てを行う。送信フレーム処理部３０２にて組み立てられた信号は変調部３０３にてπ／４シフトＱＰＳＫ（Quadri-Phase Shift Keying）等の変調処理が行われ、変調された信号が送信高周波部３０４に送られる。送信時、アンテナスイッチ３０５は送信高周波部３０４側に接続され、送信高周波部３０４にて無線周波数に変換された変調波はアンテナ３０６を介して出力される。 Next, the configuration of the in-vehicle wireless device 201 and the portable wireless device 202 will be described.
First, the in-vehicle wireless device 201 will be described with reference to FIG. When transmitting the in-vehicle wireless device 201, the control unit 301 transmits transmission data such as audio data and data for data communication from the audio codec to the transmission frame processing unit 302. The transmission frame processing unit assembles signals in accordance with a signal format defined by a standard or the like, such as error correction coding of received transmission data. The signal assembled in the transmission frame processing unit 302 is subjected to modulation processing such as π / 4 shift QPSK (Quadri-Phase Shift Keying) in the modulation unit 303, and the modulated signal is sent to the transmission high-frequency unit 304. During transmission, the antenna switch 305 is connected to the transmission high-frequency unit 304, and the modulated wave converted to a radio frequency by the transmission high-frequency unit 304 is output via the antenna 306.

一方、受信時には、アンテナスイッチ３０５は受信高周波部３０７に接続され、アンテナ３０６により受信された信号は受信高周波部３０７に送られる。受信高周波部３０７では、受信した信号を復調処理部３０８で処理できる低い周波数に変換する。変換された信号は、復調処理部３０８において復調処理され復号される。 On the other hand, at the time of reception, the antenna switch 305 is connected to the reception high frequency unit 307, and a signal received by the antenna 306 is sent to the reception high frequency unit 307. The reception high frequency unit 307 converts the received signal into a low frequency that can be processed by the demodulation processing unit 308. The converted signal is demodulated and decoded by the demodulation processing unit 308.

復調処理部３０８は、ＤＳＰ（Digital Signal Processor）等で構成される。さらに、この復調処理部３０８に等化処理を組み込むことにより、マルチパス環境で発生した遅延波やフェージングの影響を低減させている。特に、この等化処理は、車両の移動速度による高速フェージングを補償するものである。等化処理判定部３１０は、復調処理部３０８において受信信号から検出される受信電界強度に基づいて、復調処理部３０８の等化処理の実行／停止を制御する。 The demodulation processing unit 308 is configured by a DSP (Digital Signal Processor) or the like. Further, by incorporating equalization processing in the demodulation processing unit 308, the influence of delayed waves and fading generated in a multipath environment is reduced. In particular, this equalization process compensates for high-speed fading due to the moving speed of the vehicle. The equalization processing determination unit 310 controls execution / stop of the equalization processing of the demodulation processing unit 308 based on the received electric field strength detected from the reception signal by the demodulation processing unit 308.

こうして復号化されたデータは受信フレーム処理部３０９にて誤り訂正等が行われたのち、信号フォーマットに従って分解され制御部３０１に送られる。制御部３０１は受け取ったデータの情報に従って、音声コーデックや情報端末等に受信したデータを出力する。 The decoded data is subjected to error correction and the like in the reception frame processing unit 309 and then decomposed according to the signal format and sent to the control unit 301. The control unit 301 outputs the received data to an audio codec, an information terminal, or the like according to the received data information.

なお、車載無線機２０１には、携帯無線機Ｉ／Ｆ３１１が設けられ、携帯無線機２０２が置台２０３に置かれているか否かを検出し、制御部３０１に携帯無線機２０２の着脱状況を表す信号を送出する。制御部３０１は、この信号から携帯無線機２０２が置台２０３から取り外されたことを検知すると、送信処理の実行を停止し、受信処理のみ動作させる。 The in-vehicle wireless device 201 is provided with a portable wireless device I / F 311, detects whether the portable wireless device 202 is placed on the table 203, and indicates the attachment / detachment status of the portable wireless device 202 to the control unit 301. Send a signal. When the control unit 301 detects from this signal that the portable wireless device 202 has been removed from the table 203, the control unit 301 stops the execution of the transmission process and operates only the reception process.

図４は、携帯無線機２０２の構成を示すブロック図である。
携帯無線機２０２は、制御部４０１を備え、この制御部４０１にマイクロホン４１１とスピーカ４１２が接続されている。また、車載無線機２０１同様、送信フレーム処理部４０２、変調部４０３、送信高周波部４０４、アンテナスイッチ４０５、アンテナ４０６、受信高周波部４０７、復調処理部４０８、受信フレーム処理部４０９、及び等化処理判定部４１０を備える。なお、携帯無線機２０２における送受信処理の手順は車載無線機２０１と同様であるため詳しい説明は省略する。 FIG. 4 is a block diagram showing a configuration of the portable wireless device 202.
The portable wireless device 202 includes a control unit 401, and a microphone 411 and a speaker 412 are connected to the control unit 401. Similarly to the in-vehicle wireless device 201, the transmission frame processing unit 402, the modulation unit 403, the transmission high frequency unit 404, the antenna switch 405, the antenna 406, the reception high frequency unit 407, the demodulation processing unit 408, the reception frame processing unit 409, and the equalization processing A determination unit 410 is provided. Since the procedure of the transmission / reception process in the portable wireless device 202 is the same as that of the in-vehicle wireless device 201, detailed description is omitted.

制御部４０１は、マイクロホン４１１により集音された現場使用者等の音声データを送信フレーム処理部４０２に供給する。送信フレーム処理部４０２は、上記音声データから送信信号を生成する。生成された送信信号は、変調部４０３において変調処理され、送信高周波部４０４において無線周波数に変換されたのちアンテナ３０６を介して出力される。 The control unit 401 supplies the transmission frame processing unit 402 with the voice data of the site user or the like collected by the microphone 411. The transmission frame processing unit 402 generates a transmission signal from the audio data. The generated transmission signal is modulated by modulation section 403, converted to a radio frequency by transmission high frequency section 404, and then output via antenna 306.

一方、基地局又は他の移動局から到来する無線信号は、アンテナ３０６により受信され、受信高周波部４０７において周波数変換されたのち復調処理部４０８に入力される。変換された信号は、復調処理部４０８において復調処理を経て、受信フレーム処理部４０９により信号フォーマットに従って音声データに分解される。そして、制御部４０１の制御の下、この音声データはスピーカ４１２から音声として出力される。 On the other hand, a radio signal arriving from the base station or another mobile station is received by the antenna 306, frequency-converted by the reception high-frequency unit 407, and then input to the demodulation processing unit 408. The converted signal undergoes demodulation processing in the demodulation processing unit 408 and is decomposed into audio data according to the signal format by the reception frame processing unit 409. Then, under the control of the control unit 401, the sound data is output as sound from the speaker 412.

また、復調処理部４０８は、受信信号の低速フェージングを補償する等化処理機能を有する。これは、携帯無線機２０２が現場使用者に携帯して用いられるためである。等化処理判定部４１０は、復調処理部４０８において検出される受信電界強度に従ってこの等化処理の動作を制御する。 The demodulation processing unit 408 has an equalization processing function that compensates for low-speed fading of the received signal. This is because the portable wireless device 202 is carried by a field user. The equalization processing determination unit 410 controls the operation of this equalization processing according to the received electric field strength detected by the demodulation processing unit 408.

次に、このように構成される無線端末で行われる等化処理について説明する。
まず、車載無線機２０１の等化処理について説明する。図５は、等化処理判定部３１０の処理手順とその内容を示すフローチャートである。
図５において、等化処理判定部３１０は、復調処理部３０８により検出される無線回線の受信電界強度を表す受信信号強度表示信号（ＲＳＳＩ：Received Signal Strength Indicator）を取得する（ステップＳ５ａ）。次に、取得されたＲＳＳＩの表す受信電界強度が予め定められた閾値より小さいか否かを判定する（ステップＳ５ｂ）。この判定において、受信電界強度が閾値より小さいと判定された場合には、タイマが稼動中か否かを判定する（ステップＳ５ｃ）。タイマが稼動中でない場合には、タイマを開始したのち（ステップＳ５ｄ）、ステップＳ５ａに戻って上記処理を行う。なお、タイマ値には、瞬間的な受信電界強度の低下には等化処理を停止せず、等化処理を継続するように許容時間を設定しておく。 Next, an equalization process performed by the wireless terminal configured as described above will be described.
First, the equalization process of the in-vehicle wireless device 201 will be described. FIG. 5 is a flowchart showing the processing procedure and contents of the equalization processing determination unit 310.
In FIG. 5, the equalization processing determination unit 310 acquires a received signal strength indication signal (RSSI: Received Signal Strength Indicator) indicating the received electric field strength of the radio channel detected by the demodulation processing unit 308 (step S5a). Next, it is determined whether or not the received electric field strength represented by the acquired RSSI is smaller than a predetermined threshold value (step S5b). In this determination, when it is determined that the received electric field strength is smaller than the threshold value, it is determined whether or not the timer is operating (step S5c). If the timer is not in operation, after starting the timer (step S5d), the process returns to step S5a to perform the above processing. The timer value is set with a permissible time so that the equalization process is continued without stopping the equalization process for a momentary decrease in received electric field strength.

ステップＳ５ｃの判定において、タイマが稼動中である場合には、タイマの終了判定を行う（ステップＳ５ｅ）。タイマが終了していない場合には、ステップＳ５ａに戻って上記処理を繰り返し行う。等化処理判定部３１０は、ステップＳ５ｅにおいてタイマが終了したと判定すると、等化処理の停止を指示する制御信号を復調処理部３０８に送出する（ステップＳ５ｆ）。 If it is determined in step S5c that the timer is operating, it is determined whether or not the timer has ended (step S5e). If the timer has not expired, the process returns to step S5a and the above process is repeated. If the equalization process determination unit 310 determines that the timer has expired in step S5e, the equalization process determination unit 310 sends a control signal to stop the equalization process to the demodulation processing unit 308 (step S5f).

一方、等化処理判定部３１０は、ステップＳ５ｂにおいて、受信電界強度が閾値より大きいと判定すると、等化処理の実行を指示する制御信号を復調処理部３０８に送出する（ステップＳ５ｇ）。
このように構成すると、一定時間以上受信電界強度が閾値より低下した場合には等化処理が停止され、受信電界強度が閾値以上に復帰すると直ちに等化処理が実行されるようになる。これにより、常に等化処理を実行する場合に比べて、低い電界強度のエリアにおいてもより良い通信品質を確保することが可能となる。また、瞬間的な受信電界強度の低下の際には等化処理を停止させることがないため、安定した通信品質を確保することができる。 On the other hand, if the equalization processing determination unit 310 determines in step S5b that the received electric field strength is greater than the threshold value, the equalization processing determination unit 310 sends a control signal instructing execution of the equalization processing to the demodulation processing unit 308 (step S5g).
With this configuration, the equalization process is stopped when the received electric field strength falls below the threshold value for a certain time or more, and the equalization process is immediately executed when the received electric field strength returns to the threshold value or more. As a result, it is possible to ensure better communication quality even in an area having a low electric field strength as compared with the case where the equalization process is always performed. Further, since the equalization process is not stopped when the received electric field strength is momentarily reduced, stable communication quality can be ensured.

次に、携帯無線機２０２の等化処理について説明する。図６は、等化処理判定部４１０の処理手順とその内容を示すフローチャートである。
図６において、等化処理判定部４１０は、復調処理部４０８により検出される無線回線の受信電界強度を表すＲＳＳＩを取得する（ステップＳ６ａ）。次に、取得されたＲＳＳＩの表す受信電界強度が予め定められた閾値より小さいか否かを判定する（ステップＳ６ｂ）。この判定において、受信電界強度が閾値より小さいと判定された場合には、ステップＳ６ｃに移行し、等化処理の停止を指示する制御信号を復調処理部４０８に送出する。一方、ステップＳ６ｂの判定において、受信電界強度が閾値以上と判定された場合には、ステップＳ６ｄに移行し、等化処理の実行を指示する制御信号を復調処理部４０８に送出する。 Next, the equalization process of the portable wireless device 202 will be described. FIG. 6 is a flowchart showing the processing procedure and contents of the equalization processing determination unit 410.
In FIG. 6, the equalization processing determination unit 410 acquires RSSI representing the received electric field strength of the wireless line detected by the demodulation processing unit 408 (step S <b> 6 a). Next, it is determined whether or not the received electric field strength represented by the acquired RSSI is smaller than a predetermined threshold (step S6b). In this determination, when it is determined that the received electric field strength is smaller than the threshold value, the process proceeds to step S6c, and a control signal instructing to stop the equalization process is transmitted to the demodulation processing unit 408. On the other hand, if it is determined in step S6b that the received electric field strength is greater than or equal to the threshold value, the process proceeds to step S6d, and a control signal instructing execution of equalization processing is sent to the demodulation processing unit 408.

このように低速フェージング用の場合には、受信電界強度の低いエリアに入ると直ちに等化処理が停止されるため、受信レベルの低下を迅速に防ぎ、常に通信品質を良好に保つことが可能となる。
したがって上記実施形態によれば、検出された受信電界強度と、波形等化処理の時間応答特性とに基づいて、等化処理の実行／停止が行われる。このようにすることにより、常に等化処理を行っている場合に比べて、より低い電界強度のエリアにおいて良好な通信品質を確保することができる。 In this way, in the case of low-speed fading, since equalization processing is stopped immediately when entering an area where the reception electric field strength is low, it is possible to quickly prevent a decrease in reception level and always maintain good communication quality. Become.
Therefore, according to the above embodiment, the equalization process is executed / stopped based on the detected received electric field strength and the time response characteristic of the waveform equalization process. By doing in this way, compared with the case where the equalization process is always performed, favorable communication quality can be ensured in an area with a lower electric field strength.

なお、この発明は上記実施形態に限定されるものではない。前記図５及び図６では、受信電界強度に基づいて等化処理を実行／停止させる手法を説明した。その他の手法として、無線端末にＧＰＳ受信機等の位置検出手段を設け、検出された端末位置と予め用意されるエリア情報とを連動させ、特定のエリア（例えば電界強度の弱いエリアやマルチパス環境となりやすいエリア）に入った場合に等化処理の実行／停止を切り替えるようにしても良い。 The present invention is not limited to the above embodiment. 5 and 6 described the method for executing / stopping the equalization process based on the received electric field strength. As another method, a position detection unit such as a GPS receiver is provided in the wireless terminal, and the detected terminal position is linked with area information prepared in advance, so that a specific area (for example, an area with weak electric field strength or a multipath environment) It is also possible to switch the execution / stop of equalization processing when entering an area that is likely to become.

要するにこの発明は、上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合せにより種々の発明を形成できる。例えば、実施形態に示される全構成要素から幾つかの構成要素を削除してもよい。さらに、異なる実施形態に亘る構成要素を適宜組み合せてもよい。 In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

本発明の消防・救急無線システムの一実施形態を示す概略図。Schematic which shows one Embodiment of the fire fighting / emergency radio system of this invention. 図１に示す移動局に設けられる無線端末の構成の一例を示すブロック図。The block diagram which shows an example of a structure of the radio | wireless terminal provided in the mobile station shown in FIG. 図１に示す車載無線機の構成を示すブロック図。The block diagram which shows the structure of the vehicle-mounted radio | wireless machine shown in FIG. 図１に示す携帯無線機の構成を示すブロック図。The block diagram which shows the structure of the portable radio | wireless machine shown in FIG. 図１に示す車載無線機用の等化処理制御の手順とその内容を示すフローチャート。The flowchart which shows the procedure and the content of the equalization process control for vehicle-mounted radio | wireless machines shown in FIG. 図１に示す携帯無線機用の等化処理制御の手順とその内容を示すフローチャート。The flowchart which shows the procedure of the equalization process control for the portable radio | wireless machines shown in FIG. 1, and its content.

符号の説明Explanation of symbols

１０１…基地局ゾーン、１０２…無線基地局、１０３…消防署署隊本部、１０４…遠隔制御器、１０５，１０６，１０７…移動局、１０８…無線回線制御装置、１０９…警防本部、１１０…災害緊急管制台、１１１…方面本部、１１２…遠隔制御器、２０１…車載無線機、２０２…携帯無線機、２０３…置台、２０４、２０５…アンテナ、２０６，２０７…スピーカ、２０８，２０９…ハンドセット、２１０…操作表示器、２１１…パーソナル・コンピュータ、２１２…心電図計測器、３０１…制御部、３０２…送信フレーム処理部、３０３…変調部、３０４…送信高周波部、３０５…アンテナスイッチ、３０６…アンテナ、３０７…受信高周波部、３０８…復調処理部（高速フェージング用等化処理を含む）、３０９…受信フレーム処理部、３１０…等化処理判定部、３１１…携帯無線機Ｉ／Ｆ、４０１…制御部、４０２…送信フレーム処理部、４０３…変調部、４０４…送信高周波部、４０５…アンテナスイッチ、４０６…アンテナ、４０７…受信高周波部、４０８…復調処理部（低速フェージング用等化処理を含む）、４０９…受信フレーム処理部、４１０…等化処理判定部、４１１…マイクロホン、４１２…スピーカ。 DESCRIPTION OF SYMBOLS 101 ... Base station zone, 102 ... Radio base station, 103 ... Fire department bureau headquarters, 104 ... Remote controller, 105, 106, 107 ... Mobile station, 108 ... Radio network controller, 109 ... Security headquarters, 110 ... Disaster emergency Control table, 111 ... headquarters, 112 ... remote controller, 201 ... in-vehicle radio, 202 ... portable radio, 203 ... table, 204, 205 ... antenna, 206, 207 ... speaker, 208, 209 ... handset, 210 ... Operation indicator 211... Personal computer 212 Electrocardiogram measuring instrument 301 Control unit 302 Transmission frame processing unit 303 Modulation unit 304 High-frequency transmission unit 305 Antenna switch 306 Antenna 307 Reception high-frequency unit, 308... Demodulation processing unit (including equalization processing for high-speed fading), 309... Reception frame processing unit 310 ... Equalization processing determination unit, 311 ... Portable wireless device I / F, 401 ... Control unit, 402 ... Transmission frame processing unit, 403 ... Modulation unit, 404 ... Transmission high frequency unit, 405 ... Antenna switch, 406 ... Antenna, 407 ... reception high frequency section, 408 ... demodulation processing section (including equalization processing for low-speed fading), 409 ... reception frame processing section, 410 ... equalization processing determination section, 411 ... microphone, 412 ... speaker.

Claims

無線回線を介して到来する無線信号を受信する受信手段と、
前記受信された無線信号から受信電界強度を検出する検出手段と、
前記受信された無線信号の波形等化処理を行う等化処理手段と、
前記検出された受信電界強度を予め定められた閾値と比較し、前記検出された受信電界強度が一定時間以上前記閾値より小さいか否かを判定する判定手段と、
前記判定手段により前記検出された受信電界強度が前記閾値より大きいと判定された場合には、前記等化処理手段を動作させ、前記判定手段により前記検出された受信電界強度が一定時間以上前記閾値より小さいと判定された場合に前記等化処理手段を停止させる制御手段と
を具備することを特徴とする受信装置。 Receiving means for receiving a wireless signal arriving via a wireless line;
Detecting means for detecting received electric field strength from the received radio signal;
Equalization processing means for performing waveform equalization processing of the received radio signal;
Compared with a predetermined threshold the detected received field strength, the detected received signal strength determination means for determining less or not than a predetermined time greater than or equal to the threshold value,
Wherein if the detected received electric field strength is determined to be larger than the threshold value by the determination unit operates the said equalization means, said determining means by the detected received electric field strength is a predetermined time greater than or equal to the threshold value And a control unit that stops the equalization processing unit when it is determined that the value is smaller than the value.

車載用の第１の受信機と、前記第１の受信機に対し着脱自在に取着される携帯用の第２
の受信機とを具備する車載向け受信装置であって、
前記第１の受信機は、
無線回線を介して到来する無線信号を受信する第１の受信手段と、
前記受信された無線信号から受信電界強度を検出する第１の検出手段と、
前記検出された受信電界強度を予め定められた第１の閾値と比較し、前記検出された受信電界強度が一定時間以上前記第１の閾値より小さいか否かを判定する第１の判定手段と、
第１の時間応答特性に従い波形等化処理を行う第１の等化処理手段と、
前記判定手段により前記検出された受信電界強度が前記第１の閾値より大きいと判定された場合には、前記第１の等化処理手段を動作させ、前記判定手段により前記検出された受信電界強度が一定時間以上前記第１の閾値より小さいと判定された場合に前記第１の等化処理手段を停止させる第１の制御手段と
を備え、
前記第２の受信機は、
前記無線回線を介して到来する無線信号を受信する第２の受信手段と、
前記受信された無線信号から受信電界強度を検出する第２の検出手段と、
前記検出された受信電界強度を予め定められた第２の閾値と比較し、前記検出された受信電界強度が前記第２の閾値より小さいか否かを判定する第２の判定手段と、
前記第１の時間応答特性より遅い第２の時間応答特性に従い波形等化処理を行う第２の等化処理手段と、
前記判定手段により前記検出された受信電界強度が前記第２の閾値より大きいと判定された場合には、前記第２の等化処理手段を動作させ、前記判定手段により前記検出された受信電界強度が前記第２の閾値より小さいと判定された場合に前記第２の等化処理手段を停止させる第２の制御手段と
を備えることを特徴とする車載向け受信装置。 A first receiver for in-car use and a second portable for detachable attachment to the first receiver
A vehicle-mounted receiving device comprising:
The first receiver
First receiving means for receiving a wireless signal arriving via a wireless line;
First detection means for detecting a received electric field intensity from the received radio signal;
A first determination unit that compares the detected received electric field strength with a predetermined first threshold value and determines whether the detected received electric field strength is smaller than the first threshold value for a predetermined time or more; ,
First equalization processing means for performing waveform equalization processing according to a first time response characteristic;
When the determination means determines that the detected received electric field strength is greater than the first threshold, the first equalization processing means is operated, and the received electric field strength detected by the determination means And a first control means for stopping the first equalization processing means when it is determined that is less than the first threshold for a certain time or more,
The second receiver is
Second receiving means for receiving a wireless signal arriving via the wireless line;
Second detection means for detecting a received electric field intensity from the received radio signal;
A second determination means for comparing the detected received electric field strength with a predetermined second threshold and determining whether the detected received electric field strength is smaller than the second threshold;
Second equalization processing means for performing waveform equalization processing according to a second time response characteristic slower than the first time response characteristic;
When the determination means determines that the detected received electric field strength is greater than the second threshold value, the second equalization processing means is operated, and the received electric field strength detected by the determination means And a second control unit that stops the second equalization processing unit when it is determined that is smaller than the second threshold value.