JP2006211241A - Wireless signal rising detection method and apparatus - Google Patents

Wireless signal rising detection method and apparatus Download PDF

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JP2006211241A
JP2006211241A JP2005019947A JP2005019947A JP2006211241A JP 2006211241 A JP2006211241 A JP 2006211241A JP 2005019947 A JP2005019947 A JP 2005019947A JP 2005019947 A JP2005019947 A JP 2005019947A JP 2006211241 A JP2006211241 A JP 2006211241A
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JP4330152B2 (en )
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Hisanori Kitagawa
尚紀 北川
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Ministry Of Public Management Home Affairs Posts & Telecommunications
Nec Corp
日本電気株式会社
総務大臣
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<P>PROBLEM TO BE SOLVED: To provide a wireless signal rising detection apparatus stably and accurately detecting a moment of the rising of a wireless signal independently of an operating environment. <P>SOLUTION: In the wireless signal rising detection apparatus 10, an FM detection circuit 11 applies FM detection processing to a received digital complex envelope signal to convert the signal into an FM detection signal, an LPF 12 filters the FM detection signal to obtain a low frequency signal resulting from low frequency components of the FM detection signal, an HPF 15 filters the FM detection signal to obtain a high frequency signal resulting from high frequency components of the FM detection signal, an arithmetic unit 18 subtracts a high frequency signal (resulting from squaring the output of the HPF 15 by a multiplier 16 and then being smoothed by smoothing processing by a smoothing processing circuit 17) from a low frequency signal (resulting from squaring the output of the LPF 12 by a multiplier 13 and then being smoothed by smoothing processing by a smoothing processing circuit 14) and outputs a subtraction signal, and a rising detection processing circuit 19 compares the output of the subtraction signal with a prescribed threshold value to carry out the rising detection processing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、主として無線機で受信される無線信号の立ち上がり検出を行う技術に係り、詳しくはFM(周波数変調)検波出力における低周波数領域と高周波数領域とのエネルギー比が無信号時と信号到来時とで異なることを利用してプレストーク型等の断続した送信を行う無線機からの無線信号の立ち上がり検出を精度良く行う無線信号用立ち上がり検出方法及び装置に関する。 The present invention mainly relates to a technique for rising detection of a radio signal received by the radio, details FM (frequency modulation) when the energy ratio is no signal and a signal arrival of the low frequency range and high frequency range in the detection output by utilizing the fact that differs between the time about the rising edge detection method and apparatus for radio signals to accurately rising detection of a radio signal from radio for transmitting that intermittently press talk type.

従来、一般に無線機で受信される無線信号の有無を検出する無線信号用検出装置としては、例えば誤判断確率を最小にする最適閾値レベルを設定して他の無線局から到来する信号波(干渉波)の有無を判断できる信号検出装置(特許文献1参照)が挙げられる。 Conventionally, generally as a radio signal detecting system for detecting the presence or absence of a radio signal received by the radio signal wave arriving e.g. misjudgment probability after setting the optimum threshold level for minimizing other radio stations (interference signal detection apparatus capable of determining the presence or absence of a wave) (see Patent Document 1).

この信号検出装置では、最適な閾値レベルを自動的に設定する手段(閾値レベルを逐次適応的に変化させることができる)を備え、各チャネル毎の信号波を包絡線検波して信号検出の誤りを最小化できるようにしている。 In this signal detection apparatus includes means for setting an optimum threshold level automatically (threshold level can be sequentially adaptively changed), the error signal detecting signal wave of each channel by detecting the envelope It is to be minimized.

特開平05−145460号公報(要約) JP 05-145460 discloses (Abstract)

上述した特許文献1に係る信号検出装置の場合、基本機能として閾値レベルを適切なレベルに設定するためには、信号の立ち上がりの瞬間という非常に短い時間スケールと比べて長時間の測定を必要とするものであるため、信号の立ち上がりの瞬間においては閾値レベルが必ずしも適切なレベルでないことが多く、これにより実際の無線通信環境下では信号の立ち上がりの瞬間を正確に検出することが困難になっているという問題がある。 For signal detection apparatus according to Patent Document 1 described above, in order to set the threshold level as a basic function to an appropriate level, a long time is required for measurement as compared with the very short time scale that the rise of the instantaneous signal for to those, that the threshold level is not always appropriate level at the instant of the rise of the signal more, thereby under actual radio communication environment it becomes difficult to accurately detect the moment of rise of the signal there is a problem in that there.

即ち、包絡線検波を活用して無線信号の有無を検出(包絡線検波出力が所定の閾値レベル以上か否かにより無線信号の有無を検出)する場合、フェージングや外来雑音等の使用環境における依存性が強く、包絡線検波の性質からしばしば使用環境の変化に追従できないことがあり、こうした場合に実際の空間で無線信号の立ち上がりの瞬間を正確に安定して検出することが困難になっている。 That is, when detecting the presence or absence of a radio signal by utilizing the envelope detection of (envelope detection output to detect the presence or absence of the radio signal by determining whether more than a predetermined threshold level), depending on the use environment, such as fading and external noise sex strong, often the nature of the envelope detection may not be able to follow the change in use environment, the moment of rise of the radio signals in real space such cases be detected accurately and stably has become difficult .

具体的に言えば、無線信号の送信信号に相加性白色ガウス雑音が加わった場合の受信機で受信処理して得られる受信信号(中間周波数信号)を仮定すると、無信号時の包絡線における確率密度関数はレイリー分布を示し、信号到来時の包絡線における確率密度関数は仲上・ライス分布を示す。 Specifically, assuming the received signal obtained by the reception processing by the receiver when the AWGN is added to the transmission signal of the radio signal (intermediate frequency signal), the envelope under no signal probability density function represents the Rayleigh distribution, the probability density function of the envelope of the time signal incoming shows a Nakagami-Rice distribution. この2つの分布特性を正確に測定することにより最も誤りが少ない最適な閾値レベルを設定することができる。 It is possible to set the least error is less optimal threshold level by accurately measuring the two distribution characteristics. 但し、ここでの無信号時の包絡線における確率密度関数(レイリー分布)は、相加性白色ガウス雑音信号の平均電力に依存し、信号到来時の包絡線における確率密度関数(仲上・ライス分布)は、受信信号の振幅と相加性白色ガウス雑音信号の平均電力とに依存する。 However, where the probability density function in the envelope under no signal (Rayleigh distribution) depends on the average power of the additive white Gaussian noise signal, the probability density function of the envelope of the time signal incoming (Nakagami-Rice distribution) depends on the average power of the received signal amplitude and additive white Gaussian noise signal.

そこで、実際の使用環境を想定すると、フェージングによる包絡線の変動,外来雑音の変化等により正確にこれらの2つの分布特性を得るためには非常に長時間に及ぶデータの観測(測定)を行う必要があって、使用環境の変化(フェージングの変化,外来雑音の変化,捕捉しようと思っている無線機の変化等)に追従できないことにより、現実的には使用環境に拘らず無線信号の立ち上がりの瞬間を安定して正確に検出することが困難になっている。 Accordingly, it performed assuming an actual use environment, variations in the envelope due to fading, the observation data spanning a very long time in order to obtain exactly these two distribution characteristic due to changes in external noise (measurement) there is need, change in the usage environment by not follow (change of fading, change in external noise, changes in radio that going to capture), the rise of realistic irrespective radio signal to use environment moment in a stable manner is possible to accurately detect has become difficult.

本発明は、このような問題点を解決すべくなされたもので、その技術的課題は、使用環境に拘らず無線信号の立ち上がりの瞬間を安定して正確に検出し得る無線信号用立ち上がり検出方法及び装置を提供することにある。 The present invention has to have been made to solve this problem, the technical problem, the radio signal rise detection method capable of accurately detecting a stable moment of the rising of the irrespective radio signal to the environment of use and to provide a device.

本発明によれば、受信される無線信号の立ち上がり検出を行う無線信号用立ち上がり検出方法において、無線信号の複素包絡信号をFM検波処理によりFM検波信号に変換するFM検波処理段階と、FM検波信号の低域周波数成分を濾波して低域周波数信号を取得する低域濾波段階と、FM検波信号の高域周波数成分を濾波して高域周波数信号を取得する高域濾波段階と、低域濾波段階で得られた低域周波数信号と高域濾波段階で得られた高域周波数信号とを比較して比較信号を取得する比較段階と、比較信号の出力結果を所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う立ち上がり検出処理段階とを有する無線信号用立ち上がり検出方法が得られる。 According to the present invention, the rising edge detection method for a radio signal for the rising edge detection of the radio signals received, and an FM detection processing step of converting the FM detection signal by FM detection processing complex envelope signal of the radio signal, the FM detection signal a low pass filter step of acquiring low-frequency signal by filtering the low frequency components of the high-pass filter stages to obtain a filtered high frequency components to high frequency signal of the FM detection signal, low-pass filter a comparing step for obtaining a comparison signal by comparing the high frequency signal obtained by the low frequency signal and high-frequency filtering step obtained in step, the result of comparing the output results of the comparison signal with a predetermined threshold value rise detection method for a radio signal and a rising edge detection processing step of performing edge detection processing is obtained on the basis of.

一方、本発明によれば、受信される無線信号の立ち上がり検出を行う無線信号用立ち上がり検出装置において、無線信号の複素包絡信号をFM検波処理によりFM検波信号に変換して出力するFM検波回路と、FM検波信号の低域周波数成分を濾波して低域周波数信号を出力するLPFと、FM検波信号の高域周波数成分を濾波して高域周波数信号を出力するHPFと、低域周波数信号と高域周波数信号とを比較して比較信号を出力する比較器と、比較信号の出力結果を所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う立ち上がり検出処理回路とを備えた無線信号用立ち上がり検出装置が得られる。 On the other hand, according to the present invention, the rising edge detection apparatus for a radio signal for the rising edge detection of the radio signals received, and an FM detection circuit for converting the complex envelope signals of the radio signal by FM detection processing to the FM detection signal a LPF for outputting low frequency signals by filtering the low frequency components of the FM detection signal, a HPF for outputting the filtering high frequency components in the high frequency signal of the FM detection signal, a low frequency signal a comparator for outputting a comparison signal by comparing the high frequency signal, radio signal that includes a rising edge detection processing circuit which performs edge detection processing on the basis of a result of comparing the output results of the comparison signal with a predetermined threshold value rise detection device can be obtained.

又、本発明によれば、上記無線信号用立ち上がり検出装置において、低域周波数信号を所定の割合で増幅して波形整形する第1の信号増幅整形回路と、高域周波数信号を所定の割合で増幅して波形整形する第2の信号増幅整形回路とを備え、比較器は、第1の信号増幅整形回路で低域周波数信号を波形整形した信号と第2の信号増幅整形回路で高域周波数信号を波形整形した信号とを比較することにより比較信号を出力する無線信号用立ち上がり検出装置が得られる。 Further, according to the present invention, the rise detection device for the radio signals, a first signal amplification shaping circuit for waveform shaping by amplifying the low frequency signal at a predetermined ratio, a high frequency signal at a predetermined ratio amplifying a second signal amplification shaping circuit for waveform shaping, the comparator signal and high frequency in the second signal amplification shaping circuit low frequency signal at a first signal amplifying shaping circuit shapes the waveform radio signal rise detector for outputting a comparison signal by comparing the signal obtained by waveform shaping the signal is obtained.

更に、本発明によれば、上記無線信号用立ち上がり検出装置において、第1の信号増幅整形回路は、低域周波数信号を2乗する第1の乗算器と、低域周波数信号を第1の乗算器で2乗した信号を波形整形としてスムージング処理により平滑化する第1のスムージング処理回路とを備えて成り、第2の信号増幅整形回路は、高域周波数信号を2乗する第2の乗算器と、高域周波数信号を第2の乗算器で2乗した信号を波形整形としてスムージング処理により平滑化する第2のスムージング処理回路とを備えて成る無線信号用立ち上がり検出装置が得られる。 Further, according to the present invention, the rise detection device for the radio signal, a first signal amplification shaping circuit includes a first multiplier for squaring low frequency signal, multiplies the low frequency signal first made and a first smoothing processing circuit for smoothing by the smoothing processing squared signals vessel as a waveform shaping, a second signal amplifier shaping circuit includes a second multiplier for squaring the high frequency signal When the radio signal rise detection device comprising a second smoothing processing circuit for smoothing by the smoothing processing squared signal of high frequency signals in the second multiplier as waveform shaping is obtained.

加えて、本発明によれば、上記無線信号用立ち上がり検出装置において、無線信号は、断続した送信信号を受信したものであり、FM検波回路は、無線信号を受信機により受信処理して出力される中間周波数信号をA/D変換器でA/D変換することにより複素包絡信号として出力されるデジタル複素包絡信号を入力してFM検波処理を行うことによりFM検波信号へと変換出力する無線信号用立ち上がり検出装置が得られる。 In addition, according to the present invention, the rise detection device for the radio signal, a radio signal, which has received the intermittent transmission signal, FM detection circuit, the reception processing to output a radio signal by the receiver radio signal to convert the output into a FM detection signal by performing FM detection processing to input digital complex envelope signal output as a complex envelope signal by an intermediate frequency signal a / D converted by the a / D converter that use rise detection device can be obtained.

又、本発明によれば、上記無線信号用立ち上がり検出装置において、FM検波回路は、FM検波処理を行うための回路構成として、差動型のもの,FIRフィルタ型のもの,双線形変換型のものの何れか一つを持つ無線信号用立ち上がり検出装置が得られる。 Further, according to the present invention, the rise detection device for the radio signal, the FM detection circuit, as a circuit configuration for performing FM detection process, those of differential, those of the FIR filter type, the bilinear transform Monono rise detection apparatus for a radio signal having any one can be obtained.

更に、本発明によれば、上記無線信号用立ち上がり検出装置において、FM検波回路は、FM検波処理を行うための差動型の回路構成として、デジタル複素包絡信号から検波処理により瞬時位相を算出した瞬時位相信号を出力する瞬時位相検波処理部と、瞬時位相信号を所定の時間だけ遅延した遅延瞬時位相信号を出力する遅延器と、瞬時位相信号と遅延瞬時位相信号とを減算したものを瞬時位相の時間微分を示すFM検波信号として出力する減算器とを備えた無線信号用立ち上がり検出装置が得られる。 Further, according to the present invention, the rise detection device for the radio signal, the FM detection circuit, as a circuit configuration of a differential for performing FM detection process to calculate an instantaneous phase by detecting process from digital complex envelope signal and instantaneous phase detection processing unit for outputting an instantaneous phase signal, instantaneous and delay unit for outputting the delayed instantaneous phase signal the phase signal delayed by a predetermined time, the instantaneous phase signal and the delayed instantaneous phase signal and the instantaneous phase of the minus the rise detection apparatus for a radio signal and a subtracter for outputting the FM detection signal indicating a time differential is obtained.

本発明の無線信号用立ち上がり検出方法の場合、低周波数領域と高周波数領域とのエネルギー比が無信号時と信号到来時とで異なるFM検波出力を利用して無線信号の立ち上がりを検出するために、無線信号の複素包絡信号をFM検波処理段階でFM検波処理によりFM検波信号に変換し、低域濾波段階でFM検波信号の低域周波数成分を濾波して低域周波数信号を取得すると共に、高域濾波段階でFM検波信号の高域周波数成分を濾波して高域周波数信号を取得するようにした上、比較段階で低域周波数信号と高域周波数信号とを比較して得られる比較信号の出力結果を立ち上がり検出処理段階で所定の閾値と比較した結果に基づいて立ち上がり検出処理するようにしているため、フェージングや外来雑音等の使用環境の変化に依存せずに For wireless signal rising edge detection method of the present invention, in order to detect the rising edge of the radio signal by using a different FM detection output at the time of energy ratio and a signal arrival time of no signal with the low frequency range and high frequency range , together into a FM detection signal to obtain a low frequency signal by filtering the low frequency components of the FM detection signal with a low pass filtering step by FM detection processing complex envelope signal of the radio signals in the FM detection processing stage, a high pass filtering stage filters the high frequency components of the FM detection signal on which acquire the high-frequency signal, the comparison signal obtained by comparing the low frequency signal and a high frequency signal in the comparison step the output results for that to be the rising edge detection processing based on a result of comparison with a predetermined threshold at the rise detection processing stage, without depending on the change in the usage environment such as fading and external noise 線信号の立ち上がりの瞬間を安定して正確に検出することができるようになる。 It is possible to accurately detect the rise of the instantaneous line signal stably. 特に、本発明の無線信号用立ち上がり検出方法によれば、FM検波出力であるFM検波信号が無線信号の包絡線に依存しないためにフェージングによる包絡線の変化を無視でき、しかもFM検波信号には受信波のSN比が一定以上のときにはSNを改善できる効果があるために外来雑音に強いという特徴を持つ他、FM検波処理により周波数情報を求めているために既知の高速フーリエ変換によって周波数スペクトラムを求める方法よりも演算処理の負荷が軽減化され、FM検波処理段階において容易な回路構成で瞬時位相を算出してその時間微分を示すFM検波信号が得られるようになり、結果として係る検出方法を適用した検出装置においても、プレストーク型等の断続した送信を行う無線機からの無線信号の立ち上がり検出を精度良く In particular, according to the rising edge detection method for a radio signal of the present invention, the FM detection signal is FM detection output can ignore the changes in the envelope due to fading because that is independent of the envelope of the radio signals, moreover the FM detection signal except that the SN ratio of the received wave has the characteristic that resistance to external noise to when more than a predetermined an effect capable of improving the SN, the frequency spectrum by known fast Fourier transform for seeking frequency information by FM detection processing is reduced of the load of the arithmetic processing than the method of finding, become FM detection signal is obtained indicating the time differential to calculate the instantaneous phase an easy circuit arrangement in FM detection processing step, the detection method of the resulting also in the applied detection device, accurately rising detection of a radio signal from radio for transmitting that intermittently press talk type etc. 定して行うことができる機能が簡易にして安価なハードウェア構成で構築されるようになる。 Function can be performed by a constant is to be constructed in an inexpensive hardware configuration by simply.

本発明の最良の形態に係る無線信号用立ち上がり検出方法は、技術概要として、受信される無線信号の立ち上がり検出を行う際、無線信号の複素包絡信号をFM検波処理によりFM検波信号に変換するFM検波処理段階と、FM検波信号の低域周波数成分を濾波して低域周波数信号を取得する低域濾波段階と、FM検波信号の高域周波数成分を濾波して高域周波数信号を取得する高域濾波段階と、低域濾波段階で得られた低域周波数信号と高域濾波段階で得られた高域周波数信号とを比較して比較信号を取得する比較段階と、比較信号の出力結果を所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う立ち上がり検出処理段階とを有するものである。 Radio signal rise detection method according to a preferred embodiment of the present invention, as a technical overview, when performing rising detection of the radio signals received, FM to convert the complex envelope signal of the radio signal by FM detection processing to the FM detection signal a detection processing step, the high to obtain a low-pass filtered phase to obtain a filtered to low frequency signal low frequency components of the FM detection signal, filters the high frequency components of the FM detection signal high frequency signal and pass filtering step, a comparison step of acquiring compared to the comparison signal and a high frequency signal obtained by the low frequency signal and high-frequency filtering step resulting in a low pass filtering step, the output of the comparison signal those having a rising edge detection processing step of performing edge detection processing based on a result of comparison with a predetermined threshold value.

又、この検出方法を適用した無線信号用立ち上がり検出装置は、受信される無線信号の立ち上がり検出を行う機能を持つもので、無線信号の複素包絡信号をFM検波処理によりFM検波信号に変換して出力するFM検波回路と、FM検波信号の低域周波数成分を濾波して低域周波数信号を出力するLPFと、FM検波信号の高域周波数成分を濾波して高域周波数信号を出力するHPFと、低域周波数信号と高域周波数信号とを比較して比較信号を出力する比較器と、比較信号の出力結果を所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う立ち上がり検出処理回路とを備えるものである。 Furthermore, this detection method the rising edge detection apparatus for a radio signal according to the are those having a function of rising detection of radio signals received is converted into the FM detection signal complex envelope signal of the radio signal by the FM detection processing and FM detection circuit for outputting a LPF for outputting a filtered to low frequency signal low frequency components of the FM detection signal, and HPF which filters the high frequency components of the FM detection signal and outputs the high frequency signal a comparator for outputting a comparison signal by comparing the low frequency signal and a high frequency signal, a rising detection processing circuit which performs edge detection processing on the basis of a result of comparing the output results of the comparison signal with a predetermined threshold value it is those with a.

更に、この無線信号用立ち上がり検出装置において、低域周波数信号を所定の割合で増幅して波形整形する第1の信号増幅整形回路と、高域周波数信号を所定の割合で増幅して波形整形する第2の信号増幅整形回路とを備え、比較器により第1の信号増幅整形回路で低域周波数信号を波形整形した信号と第2の信号増幅整形回路で高域周波数信号を波形整形した信号とを比較することにより比較信号を出力するようにすることが好ましい。 Further, in the radio signal for the rising edge detection unit, a first signal amplification shaping circuit that amplifies and shapes the waveform of the low frequency signal at a predetermined ratio, waveform shaping amplifies the high frequency signal at a predetermined ratio and a second signal amplifying shaping circuit, a first signal a low frequency signal and waveform-shaped by the signal amplification shaping circuit and a signal which the high frequency signal with a second signal amplifying shaping circuit waveform shaping by the comparator it is preferable to output a comparison signal by comparing the. 比較器としては、第1の信号増幅整形回路で低域周波数信号を波形整形した信号から第2の信号増幅整形回路で高域周波数信号を波形整形した信号を減算することにより減算信号を出力する減算器を用いるのが好適である。 The comparator outputs a subtraction signal by subtracting the high frequency signal waveform shaping signal in the second signal amplification shaping circuit from the low-frequency signal waveform shaping signal in the first signal amplification shaping circuit it is preferable to use a subtractor.

図1は、本発明の無線信号用立ち上がり検出装置に備えられるFM検波回路でFM検波処理されるFM検波信号(FM検波出力)における無信号時及び信号到来時についての周波数[Hz]に対する信号レベル[dB]の特性図を示したものである。 1, the signal level for the frequency [Hz] for the quiescent and signal when arriving at the FM detection signal FM detection processing by the FM detection circuit provided in the rise detection device for radio signals of the present invention (FM detection output) It shows a characteristic diagram of a [dB]. 又、図2は、図1に示す特性図における低周波数領域を拡大して示した低周波数側特性図である。 Also, FIG. 2 is a low-frequency side characteristic view showing an enlarged lower frequency range of the characteristic diagram shown in FIG.

これらの各図では、FM検波回路において、無信号時には周波数特性が平坦で比較的高信号レベルの白色雑音がFM検波信号として出力され、信号到来時には立ち上がり波形や比較的低い信号レベルの音声波形がFM検波信号として出力され、特に信号到来時における立ち上がりの波形については低域周波数側寄りにエネルギーが集中することを示している。 In these figures, the FM detection circuit, white noise of a relatively high signal level flat frequency characteristics when no signal is output as the FM detection signal, at the time of signal arrival is rising waveform and a relatively low signal level of the sound waveform It is output as an FM detection signal, indicating that energy is concentrated in the low frequency side closer for the rise of the waveform, especially at the time of signal arrival. 従って、FM検波信号の低域周波数側通過エネルギーと高域周波数側通過エネルギーとの違い(即ち、FM検波出力の低周波数領域と高周波数領域とのエネルギー比が無信号時と信号到来時とで異なること)を利用すれば、無線信号の立ち上がりの瞬間を安定して正確に検出することが可能となる。 Thus, the difference between the low frequency side pass energy and the high-frequency side pass energy of the FM detection signal (i.e., the energy ratio between the low frequency range and high frequency range of the FM detection output in the time when the signal arrives no signal by utilizing different), it is possible to accurately detect stably the moment of rise of the radio signal.

図3は、本発明の実施例1に係る無線信号用立ち上がり検出装置10の基本構成を示した簡易回路ブロック図である。 Figure 3 is a simplified circuit block diagram showing the basic configuration of the wireless signal rise detection device 10 according to the first embodiment of the present invention.

この無線信号用立ち上がり検出装置10は、アンテナ1により受信される無線信号を受信機2により受信処理して出力される受信信号(中間周波数信号)をA/D変換器3でA/D変換することにより複素包絡信号としてデジタル複素包絡信号を出力するタイプのプレストーク型等の断続した送信を行う無線機向けのもので、デジタル複素包絡信号をFM検波処理によりFM検波信号に変換して出力するFM検波回路11と、FM検波信号の低域周波数成分を濾波して低域周波数信号を出力するLPF12と、低域周波数信号を2乗する第1の乗算器13と、低域周波数信号を第1の乗算器13で2乗した信号を波形整形としてスムージング処理により平滑化する第1のスムージング処理回路14と、FM検波信号の高域周波数成分を濾波し The radio signal for the rising edge detection unit 10 A / D converting a signal received processed and output a radio signal by the receiver 2 to be received (intermediate frequency signal) by the A / D converter 3 by the antenna 1 digital complex envelope signals intended radio for performing intermittent transmission was press talk type or the like of the type that outputs, and outputs the digital complex envelope signal is converted into the FM detection signal by FM detection processing as a complex envelope signal by and FM detection circuit 11, filters the low frequency components of the FM detection signal and LPF12 for outputting a low frequency signal, a first multiplier 13 which squares the low frequency signal, the low frequency signal first a first smoothing processing circuit 14 for smoothing the smoothing processing the squared signal in first multiplier 13 as a waveform shaping filters the high frequency components of the FM detection signal 高域周波数信号を出力するHPF15と、高域周波数信号を2乗する第2の乗算器16と、高域周波数信号を第2の乗算器16で2乗した信号を波形整形としてスムージング処理により平滑化する第2のスムージング処理回路17と、低域周波数信号を波形整形した信号から高域周波数信号を波形整形した信号を減算することにより減算信号を出力する減算器18と、減算信号の出力結果を所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う立ち上がり検出処理回路19とを備えて構成される。 And HPF15 for outputting a high frequency signal, a second multiplier 16 which squares the high frequency signal by smoothing the high frequency signal a frequency signal squared by the second multiplier 16 as a waveform shaping smooth a second smoothing processing circuit 17 of a subtractor 18 for outputting a subtraction signal by subtracting the high frequency signal waveform shaping signal from the signal waveform shaping the low frequency signal, then the output of the subtraction signal the based on a result of comparison with a predetermined threshold constituted and a rising edge detection processing circuit 19 which performs edge detection processing.

このうち、第1の乗算器13及び第1のスムージング処理回路14は、LPF12から出力される低域周波数信号を所定の割合で増幅して波形整形する第1の信号増幅整形回路として働く。 Of these, the first multiplier 13 and first smoothing processing circuit 14 serves as a first signal amplifier shaping circuit which amplifies and shapes the waveform of the low frequency signal outputted from the LPF12 at a predetermined ratio. 同様に、第2の乗算器16及び第2のスムージング処理回路17は、HPF15から出力される高域周波数信号を所定の割合で増幅して波形整形する第2の信号増幅整形回路として働く。 Similarly, the second multiplier 16 and the second smoothing processing circuit 17 serves as a second signal amplifier shaping circuit which amplifies and shapes the waveform of the high frequency signal outputted from the HPF15 at a predetermined ratio.

この無線信号用立ち上がり検出装置10の場合、プレストーク型等の断続した送信を行う無線機にあって、アンテナ1で受信された無線信号を受信機2により受信処理して中間周波数信号の受信信号とし、更にA/D変換器3で受信信号をA/D変換して得られるデジタル複素包絡信号を入力するものであるが、先ずFM検波回路11ではFM検波処理によりA/D変換器3から出力されるデジタル複素包絡信号をFM検波信号に変換して出力する。 For the radio signal the rise detector 10, in the radio transmission is performed with intermittently press talk type or the like, the reception signal of the intermediate frequency signal to the reception processing by the receiver 2 a radio signal received by the antenna 1 and then, but is intended to further enter the digital complex envelope signal obtained by a / D converting a received signal by the a / D converter 3, the a / D converter 3 by first FM detection circuit 11, an FM detection processing It converts the digital complex envelope signal output to the FM detection signal output.

このFM検波信号は、分岐されて一方のものがLPF12に入力され、他方のものがHPF15に入力される。 The FM detection signal is branched those of one is input to the LPF 12, the other one is input to the HPF 15. LPF12では、FM検波信号の低域周波数成分のみを濾波して低域周波数信号を出力する。 In LPF 12, and outputs a low frequency signal by filtering only the low frequency components of the FM detection signal. この低域周波数信号は第1の乗算器13に入力され、乗算器13では低域周波数信号を2乗することで低域周波数エネルギー信号に変換して第1のスムージング処理回路14へ送出し、スムージング処理回路14では低域周波数エネルギー信号を適切値に平滑化して低域周波数信号の波形整形した信号を出力する。 The low frequency signal is input to the first multiplier 13, and sent to convert the multiplier 13 the low frequency signal to the low frequency energy signal by squaring the first smoothing processing circuit 14, in the smoothing processing circuit 14 is smoothed in the appropriate value of low frequency energy signal and outputs the waveform-shaped signal of the low frequency signal.

これに対し、HPF15では、FM検波信号の高域周波数成分のみを濾波して高域周波数信号を出力する。 In contrast, in HPF 15, and filters only the high frequency components of the FM detection signal and outputs the high frequency signal. この高域周波数信号は第2の乗算器16に入力され、乗算器16では高域周波数信号を2乗することで高域周波数エネルギー信号に変換して第2のスムージング処理回路17へ送出し、スムージング処理回路17では高域周波数エネルギー信号を適切値に平滑化して高域周波数信号の波形整形した信号を出力する。 The high frequency signal is input to a second multiplier 16, and sent to convert the high frequency signal in the multiplier 16 to the high frequency energy signal by squaring the second smoothing processing circuit 17, in the smoothing processing circuit 17 is smoothed in the proper value of high-frequency energy signal and outputs the waveform-shaped signal of the high frequency signal.

これらの第1のスムージング処理回路14で得られる低域周波数信号の波形整形した信号と第2のスムージング処理回路17で得られる高域周波数信号の波形整形した信号とは何れも減算器18に入力され、減算器18では、低域周波数信号の波形整形した信号から高域周波数信号の波形整形した信号を減算することにより差分を求めて減算信号を立ち上がり検出処理回路19へ送出する。 Waveform shaping of the low frequency signal obtained by the first smoothing processing circuit 14 of the signal and both the waveform shaping signal of the high frequency signal obtained by the second smoothing processing circuit 17 inputs to the subtractor 18 It is, the subtracter 18, and sends the subtraction signal seeking the difference by subtracting the waveform shaping signal of the high frequency signal from the waveform shaping signal of low frequency signal to the rising edge detection processing circuit 19. 立ち上がり検出処理回路19では、減算信号の出力結果を適切な所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う。 The rising edge detection processing circuit 19 performs the edge detection processing based on the result of comparing the output of the subtraction signal with the appropriate predetermined threshold.

ところで、FM検波回路11におけるFM検波処理は、無線信号の複素包絡信号にあっての瞬時位相の時間微分を求めることにより行われるが、離散的なデジタル信号を扱う場合にも適用可能である。 Incidentally, an FM detection processing in the FM detection circuit 11 is carried out by determining the time derivative of the instantaneous phase of the In the complex envelope signal of the radio signals, can also be applied when dealing with discrete digital signal.

図4は、上述した無線信号用立ち上がり検出装置10に備えられるFM検波回路11の細部構成を例示した簡易回路ブロック図である。 Figure 4 is a simplified circuit block diagram illustrating a detailed configuration of the FM detection circuit 11 provided in the radio signal for the rising edge detection apparatus 10 described above. このFM検波回路11は、FM検波処理を行うための差動型の回路構成として、プレストーク型等の断続した送信を行う無線機の無線信号により得られるデジタル複素包絡信号I(n),Q(n)から検波処理により瞬時位相を算出した瞬時位相信号を出力する瞬時位相検波処理回路20と、瞬時位相信号を所定の時間だけ遅延した遅延瞬時位相信号を出力する遅延器21と、瞬時位相信号から遅延瞬時位相信号を減算したものを瞬時位相の時間微分を示すFM検波信号として出力する減算器22とを備えて構成される。 The FM detection circuit 11, as a circuit configuration of a differential for performing FM detection process, the digital complex envelope signals obtained by the intermittent radio signal radio for transmitting the press talk type like I (n), Q the detection process from (n) and the instantaneous phase detection processing circuit 20 that outputs the instantaneous phase signal to calculate the instantaneous phase, a delay unit 21 for outputting the delayed instantaneous phase signal delayed instantaneous phase signal by a predetermined time, the instantaneous phase constructed and a subtracter 22 which outputs a minus the delayed instantaneous phase signal from the signal as FM detection signal indicating the time derivative of the instantaneous phase.

図4を参照して具体的に説明すれば、このFM検波回路11では、先ず前段のA/D変換器4で生成出力されたデジタル複素包絡信号I(n),Q(n)を入力した瞬時位相検波処理回路20が瞬時位相φ(n)をφ(n)=tan −1 {Q(n)/I(n)}なる関係式に基づいて求め、その結果を示す瞬時位相信号を出力する。 In detail with reference to FIG. 4, in the FM detection circuit 11, first, the previous stage of the A / D output generated by the converter 4 digital complex envelope signal I (n), and inputs the Q (n) calculated instantaneous phase detection processing circuit 20 is based on the instantaneous phase phi (n) to φ (n) = tan -1 { Q (n) / I (n)} relational expression, outputs the instantaneous phase signal indicating the result to.

この現在の瞬時位相φ(n)を示す瞬時位相信号は、遅延器21にも分配されており、遅延器21では瞬時位相信号を所定の時間だけ遅延した直前の瞬時位相φ(n−1)を示す遅延瞬時位相信号を出力する。 The current instantaneous phase phi instantaneous phase signal indicating a (n) is also distributed to the delay unit 21, the instantaneous phase of the immediately preceding delayed in delay unit 21 an instantaneous phase signal by a predetermined time φ (n-1) and it outputs the delayed instantaneous phase signal indicating. そこで、減算器22では、現在の瞬時位相φ(n)を示す瞬時位相信号からその直前の瞬時位相φ(n−1)を示す遅延瞬時位相信号を減算することにより瞬時位相の変化、即ち、離散信号における瞬時位相の時間微分を求めてFM検波信号として出力する。 Therefore, the subtracter 22, the change of the instantaneous phase by subtracting the delayed instantaneous phase signal indicating the instantaneous phase φ (n-1) immediately preceding to the current instantaneous phase phi (n) instantaneous phase signal indicating, that is, seeking time derivative of the instantaneous phase in the discrete signal and outputs it as an FM detection signal.

尚、図4に示すFM検波回路11は、FM検波処理を差動型のタイプで行う場合を例示しているが、これに代えてFIRフィルタ型や双線形変換型のものを採用しても良い。 Incidentally, an FM detection circuit 11 shown in FIG. 4, but illustrates a case where the FM detection processing in differential type, be employed as the FIR filter type and bilinear transform instead of this good. 因みに、FM検波回路11やそのFM検波処理自体は一般的に周知なもので、それに関連する公知文献としては、例えば特開昭61−134115号公報の「FM受信機の受信局検出装置」,特開昭61−240727号公報の「受信機」,特開昭63−190432号公報の「FM受信機のミュート回路」,特開平5−153522号公報の「音声多重放送受信装置」,特開平11−163764号公報の「通信機」等が挙げられる。 Incidentally, those FM detection circuit 11 and the FM detection process itself is generally known, as is known in the literature associated with it, "receiving station detector of an FM receiver" for example in JP 61-134115, JP- JP 61-240727 Patent "receiver" of JP, Sho "mute circuit of an FM receiver" on 63-190432, JP "sound multiplex broadcast receiving apparatus" in Japanese Patent Laid-Open 5-153522, JP-a No. "communicator" etc. 11-163764 JP thereof. 又、上述した無線信号用立ち上がり検出装置10に備えられる減算器18は、基本的に比較機能を持つ比較器であれば良いものであり、減算器18に代えて除算器を用いることも可能である。 Further, a subtractor 18 provided in the radio signal rise detection device 10 described above is intended may be a comparator having a basically comparing function, it is also possible to use a divider in place of the subtractor 18 is there.

本発明の無線信号用立ち上がり検出装置に備えられるFM検波回路でFM検波処理されるFM検波信号(FM検波出力)における無信号時及び信号到来時についての周波数に対する信号レベルの特性図を示したものである。 It shows the characteristics of the signal level diagram for the frequency of operation and in the signal arriving no signal in the FM detection circuit provided in the radio signal for the rising edge detection device in the FM detection signal FM detection processing (FM detection output) of the present invention it is. 図1に示す特性図における低周波数領域を拡大して示した低周波数側特性図である。 The low frequency side characteristic diagram showing an enlarged lower frequency range of the characteristic diagram shown in FIG. 本発明の実施例1に係る無線信号用立ち上がり検出装置の基本構成を示した簡易回路ブロック図である。 Is a simplified circuit block diagram showing the basic configuration of the rise detection device for radio signals according to a first embodiment of the present invention. 図3に示す無線信号用立ち上がり検出装置に備えられるFM検波回路の細部構成を例示した簡易回路ブロック図である。 It is a simplified circuit block diagram illustrating a detailed configuration of the FM detection circuit provided in the rise detection apparatus for a radio signal shown in FIG.

符号の説明 DESCRIPTION OF SYMBOLS

1 アンテナ 2 受信機 3 A/D変換器 10 無線信号用立ち上がり検出装置 11 FM検波回路 12 LPF(低周波数濾波器) 1 Antenna 2 receiver 3 A / D converter 10 the radio signal rise detector 11 FM detection circuit 12 LPF (low-frequency filter)
13,16 乗算器 14,17 スムージング処理回路 15 HPF(高周波数濾波器) 13, 16 multipliers 14 and 17 smoothing processing circuit 15 HPF (high-frequency filter)
18,22 減算器 19 立ち上がり検出処理回路 20 瞬時位相検波処理回路 21 遅延器 18,22 subtractor 19 rising detection processing circuit 20 the instantaneous phase detection processing circuit 21 delayer

Claims (7)

  1. 受信される無線信号の立ち上がり検出を行う無線信号用立ち上がり検出方法において、前記無線信号の複素包絡信号をFM検波処理によりFM検波信号に変換するFM検波処理段階と、前記FM検波信号の低域周波数成分を濾波して低域周波数信号を取得する低域濾波段階と、前記FM検波信号の高域周波数成分を濾波して高域周波数信号を取得する高域濾波段階と、前記低域濾波段階で得られた前記低域周波数信号と前記高域濾波段階で得られた前記高域周波数信号とを比較して比較信号を取得する比較段階と、前記比較信号の出力結果を所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う立ち上がり検出処理段階とを有することを特徴とする無線信号用立ち上がり検出方法。 In the rising edge detection method for a radio signal for the rising edge detection of the radio signals received, and an FM detection processing step of converting the FM detection signal complex envelope signal of the radio signal by FM detection process, the low frequency of the FM detection signal a low pass filter step of acquiring low-frequency signal by filtering the components, and a high pass filter step of acquiring filtering high frequency components in the high frequency signal of the FM detection signal, in the low-pass filtering stage a comparison step obtained above to obtain a comparison to the comparison signal and said high-frequency signal obtained by the high frequency filter stage with low frequency signals, and the output result of said comparison signal is compared with a predetermined threshold value rise detection method for a radio signal and having a rising edge detection processing step of performing edge detection processing based on the results.
  2. 受信される無線信号の立ち上がり検出を行う無線信号用立ち上がり検出装置において、前記無線信号の複素包絡信号をFM検波処理によりFM検波信号に変換して出力するFM検波回路と、前記FM検波信号の低域周波数成分を濾波して低域周波数信号を出力するLPFと、前記FM検波信号の高域周波数成分を濾波して高域周波数信号を出力するHPFと、前記低域周波数信号と前記高域周波数信号とを比較して比較信号を出力する比較器と、前記比較信号の出力結果を所定の閾値と比較した結果に基づいて立ち上がり検出処理を行う立ち上がり検出処理回路とを備えたことを特徴とする無線信号用立ち上がり検出装置。 In the rising edge detection apparatus for a radio signal for the rising edge detection of the radio signals received, and an FM detection circuit for converting the complex envelope signal of the radio signal by FM detection processing to the FM detection signal, the low of the FM detection signal a LPF for outputting a low frequency signal by filtering the frequency components, and HPF to output a high frequency component to filter the high-frequency signal of the FM detection signal, the low frequency signal and the high band frequency a comparator for outputting a comparison signal by comparing the signal, characterized in that a rising edge detection processing circuit which performs edge detection processing based on a result of the output of the comparison signal is compared with a predetermined threshold value radio signal rising edge detection device.
  3. 請求項2記載の無線信号用立ち上がり検出装置において、前記低域周波数信号を所定の割合で増幅して波形整形する第1の信号増幅整形回路と、前記高域周波数信号を所定の割合で増幅して波形整形する第2の信号増幅整形回路とを備え、前記比較器は、前記第1の信号増幅整形回路で前記低域周波数信号を波形整形した信号と前記第2の信号増幅整形回路で前記高域周波数信号を波形整形した信号とを比較することにより前記比較信号を出力することを特徴とする無線信号用立ち上がり検出装置。 In the rising edge detection device for radio signals according to claim 2, wherein the amplifying the first signal amplification shaping circuit for waveform shaping by amplifying the low frequency signal at a predetermined ratio, the high-frequency signal at a predetermined ratio and a second signal amplifying shaping circuit for waveform-shaping Te, said comparator, said low-frequency signal waveform shaping signal and the second signal amplifying shaping circuit in the first signal amplification shaping circuit rise detection device for a radio signal and outputting the comparison signal by comparing the waveform shaping signal of the high frequency signal.
  4. 請求項3記載の無線信号用立ち上がり検出装置において、前記第1の信号増幅整形回路は、前記低域周波数信号を2乗する第1の乗算器と、前記低域周波数信号を前記第1の乗算器で2乗した信号を波形整形としてスムージング処理により平滑化する第1のスムージング処理回路とを備えて成り、前記第2の信号増幅整形回路は、前記高域周波数信号を2乗する第2の乗算器と、前記高域周波数信号を前記第2の乗算器で2乗した信号を波形整形としてスムージング処理により平滑化する第2のスムージング処理回路とを備えて成ることを特徴とする無線信号用立ち上がり検出装置。 In the rising edge detection device for radio signals according to claim 3, wherein the first signal amplifying shaping circuit, said a first multiplier for squaring low frequency signal, multiplying the low frequency signal of the first made and a first smoothing processing circuit for smoothing by the smoothing processing squared signals vessel as a waveform shaping, the second signal amplifying shaping circuit, a second squaring the high-frequency signal multipliers and, for radio signals, characterized by comprising a second smoothing processing circuit for smoothing by the smoothing processing squared signal the high-frequency signal in the second multiplier as a waveform shaping rising detection device.
  5. 請求項4記載の無線信号用立ち上がり検出装置において、前記無線信号は、断続した送信信号を受信したものであり、前記FM検波回路は、前記無線信号を受信機により受信処理して出力される中間周波数信号をA/D変換器でA/D変換することにより前記複素包絡信号として出力されるデジタル複素包絡信号を入力して前記FM検波処理を行うことにより前記FM検波信号へと変換出力することを特徴とする無線信号用立ち上がり検出装置。 In the rising edge detection apparatus for a radio signal according to claim 4, wherein the radio signal, which has received the intermittent transmission signal, the FM detection circuit, the intermediate received processed and output by the receiver of the radio signal that enter the digital complex envelope signal output as the complex envelope signal and converting the output to the FM detection signal by performing the FM detection processing by a / D conversion at a frequency signal a / D converter rise detection device for radio signals, characterized in.
  6. 請求項5記載の無線信号用立ち上がり検出装置において、前記FM検波回路は、前記FM検波処理を行うための回路構成として、差動型のもの,FIRフィルタ型のもの,双線形変換型のものの何れか一つを持つことを特徴とする無線信号用立ち上がり検出装置。 In the rising edge detection apparatus for a radio signal according to claim 5, wherein the FM detection circuit, as a circuit configuration for performing the FM detection process, those of differential, those of the FIR filter type, either one of the bilinear transform rise detection device for radio signals, characterized by having one or.
  7. 請求項5記載の無線信号用立ち上がり検出装置において、前記FM検波回路は、前記FM検波処理を行うための前記差動型の回路構成として、前記デジタル複素包絡信号から検波処理により瞬時位相を算出した瞬時位相信号を出力する瞬時位相検波処理部と、前記瞬時位相信号を所定の時間だけ遅延した遅延瞬時位相信号を出力する遅延器と、前記瞬時位相信号と前記遅延瞬時位相信号とを減算したものを前記瞬時位相の時間微分を示す前記FM検波信号として出力する減算器とを備えたことを特徴とする無線信号用立ち上がり検出装置。 In the rising edge detection apparatus for a radio signal according to claim 5, wherein the FM detection circuit, as a circuit configuration of the differential for performing the FM detection process to calculate an instantaneous phase by detecting process from the digital complex envelope signal and instantaneous phase detection processing unit for outputting an instantaneous phase signal, obtained by subtracting a delay for outputting a delayed instantaneous phase signal obtained by delaying the instantaneous phase signal by a predetermined time, and the delay instantaneous phase signal and the instantaneous phase signal rise detection device for radio signals, characterized in that it comprises a subtractor for outputting as said FM detection signal indicative of a time derivative of the instantaneous phase of the.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7791537B2 (en) * 2006-03-14 2010-09-07 Nec Corporation Radio monitoring apparatus and method
JP2013062593A (en) * 2011-09-12 2013-04-04 Nec Corp Communication device, reception signal detection device and reception signal detection method
JP2013201504A (en) * 2012-03-23 2013-10-03 Nec Corp Communication apparatus, received signal detection device, and received signal detection method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7791537B2 (en) * 2006-03-14 2010-09-07 Nec Corporation Radio monitoring apparatus and method
JP2013062593A (en) * 2011-09-12 2013-04-04 Nec Corp Communication device, reception signal detection device and reception signal detection method
JP2013201504A (en) * 2012-03-23 2013-10-03 Nec Corp Communication apparatus, received signal detection device, and received signal detection method

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