JP2006148276A - Method for detecting uw signal - Google Patents

Method for detecting uw signal Download PDF

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JP2006148276A
JP2006148276A JP2004332660A JP2004332660A JP2006148276A JP 2006148276 A JP2006148276 A JP 2006148276A JP 2004332660 A JP2004332660 A JP 2004332660A JP 2004332660 A JP2004332660 A JP 2004332660A JP 2006148276 A JP2006148276 A JP 2006148276A
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Atsushi Murakami
篤志 村上
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Hitachi Kokusai Electric Inc
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<P>PROBLEM TO BE SOLVED: To provide a method for detecting a UW signal in which incorrect recognition of the UW signal is prevented when a received demodulation signal is is mixed with noise. <P>SOLUTION: The method for recognizing a UW signal included in a received signal comprises first to five steps of: (1) calculating the correlation value of the received signal and a well known UW signal on the receiving side; (2) testing whether the peak value of the correlation value exceeds a predetermined first threshold or not; (3) calculating a correlation value S from the peak value of the correlation value, calculating a correlation value N from the correlation value around the correlation value S, and calculating the S/N ratio from the correlation value S and the correlation value N if the results from test in the second step is yes; (4) testing whether the S/N ratio in the third step exceeds a predetermined second threshold; and (5) outputting an OK signal indicating recognition of the UW signal if the test result in the fourth step is yes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、受信復調信号に含まれているＵＷ信号の認識に関するものである。   The present invention relates to recognition of a UW signal included in a received demodulated signal.

従来、受信復調信号に含まれているＵＷ（Unique Word ）信号の認識の方法として、図５に示すように、受信復調信号（１−１）と受信側で既知のＵＷ（１−２）信号との相関値算出（１−３）を行い、相関ピーク値（ｐ０）を算出し、この相関ピーク値（ｐ０）にしきい値（１−４）を設けて比較することで、受信復調信号内のＵＷ信号の認識判定を行っている。 Conventionally, as a method for recognizing a UW (Unique Word) signal included in a received demodulated signal, as shown in FIG. 5, the received demodulated signal (1-1) and a UW (1-2) signal known on the receiving side are used. The correlation value is calculated (1-3), the correlation peak value (p 0 ) is calculated, and the correlation peak value (p 0 ) is provided with a threshold value (1-4) for comparison, thereby receiving and demodulating Recognition determination of the UW signal in the signal is performed.

図６は、この場合の動作を示すフロー図であって、動作開始のステップ（ＳＴ１０）、前記の相関値算出（１−３）を行うステップ（ＳＴ１１）、その相関ピーク値がしきい値を越えるかのテストをするステップ（ＳＴ１２）、このステトが「ｙｅｓ」のときに「ＵＷ認識ＯＫ」とするステップ（ＳＴ１５）、このテストが「ｎｏ」のときに「ＵＷ認識ＮＧ」とするステップ（ＳＴ１６）より成る。   FIG. 6 is a flowchart showing the operation in this case. The operation start step (ST10), the correlation value calculation (1-3) step (ST11), and the correlation peak value indicates the threshold value. A step of testing whether it exceeds (ST12), a step of setting “UW recognition OK” when this state is “yes” (ST15), and a step of setting “UW recognition NG” when this test is “no” ( ST16).

しかし、この従来技術では、図７に示すように、ノイズ復調信号（２−１）の受信中においても、ＵＷ信号との相関値算出結果（２−２）、相関ピーク値（ｐ１、ｐ２、ｐ３）がしきい値（２−３）以上となった時に、ＵＷ信号であるとの誤認識をしてしまうことが起こり得る。これは、「ＵＷ認識ＯＫ」の状態で発生する誤認識である。 However, in this prior art, as shown in FIG. 7, even during reception of the noise demodulated signal (2-1), the correlation value calculation result (2-2) with the UW signal and the correlation peak values (p 1 , p When 2 , p 3 ) is equal to or greater than the threshold value (2-3), it may occur that the UW signal is erroneously recognized. This is a recognition error that occurs in the “UW recognition OK” state.

このような誤認識を防止するため、図５のしきい値１−４及び図７のしきい値２−３の如き高いレベルのしきい値ａの外にそのしきい値ａより低いレベルのしきい値ｂをも用いる図８に示す判定方法が提案されている（特許文献１参照）。
特開平７−２５０１２０号公報（第３−４頁、図３） In order to prevent such misrecognition, in addition to the high level threshold value a such as the threshold value 1-4 in FIG. 5 and the threshold value 2-3 in FIG. A determination method shown in FIG. 8 that also uses the threshold value b has been proposed (see Patent Document 1).
JP 7-250120 A (page 3-4, FIG. 3)

しかし、この判定方法は、広帯域伝送におけるマルチパスによる周波数選択性フェージングを受けた受信復調信号に含まれるＵＷ信号と同期をとる際の誤同期の発生を回避するための提案であって、雑音による誤同期の発生を回避する機能はない。   However, this determination method is a proposal for avoiding mis-synchronization when synchronizing with a UW signal included in a received demodulated signal subjected to frequency selective fading due to multipath in wideband transmission. There is no function to avoid the occurrence of false synchronization.

本発明の目的は、受信復調信号にノイズが混入して受信された時のＵＷ信号の誤認識を防止することができるＵＷ信号の検出方法を提供することにある。   An object of the present invention is to provide a UW signal detection method capable of preventing erroneous recognition of a UW signal when noise is mixed in a received demodulated signal.

この課題を解決するために、本発明によるＵＷ信号の検出方法は、受信信号に含まれているＵＷ信号の認識に、ノイズに対する信号の割合を用いることで、ＵＷの誤認識防止をするように構成されている。
即ち、本発明によるＵＷ信号の検出方法は、受信信号に含まれているＵＷ信号を認識するために、
前記受信信号と受信側で既知のＵＷ信号との相関値を算出する第一のステップと、
該相関値のピーク値が予め定めた第一のしきい値を越えるかのテストをする第二のステップと、
該第二のステップにおける前記テストがｙｅｓである場合に、前記相関値のピーク値から相関値Ｓを算出し、該相関値Ｓの周囲の相関値から相関値Ｎを算出し、更に、該相関値Ｓ及び該相関値Ｎの値からＳ／Ｎ比を算出する第三のステップと、
該第三のステップにおけるＳ／Ｎ比が予め定めた第二のしきい値を越えるかのテストをする第四のステップと、
該第四のステップにおける前記テストがｙｅｓである場合にＵＷ信号の認識を示すＯＫ信号を出力する第五のステップと、
を備えた構成を有している。 In order to solve this problem, the UW signal detection method according to the present invention prevents erroneous recognition of UW by using the ratio of the signal to noise for the recognition of the UW signal included in the received signal. It is configured.
That is, the UW signal detection method according to the present invention recognizes the UW signal included in the received signal.
A first step of calculating a correlation value between the received signal and a known UW signal on the receiving side;
A second step of testing whether the peak value of the correlation value exceeds a predetermined first threshold;
When the test in the second step is yes, the correlation value S is calculated from the peak value of the correlation value, the correlation value N is calculated from the correlation values around the correlation value S, and the correlation A third step of calculating the S / N ratio from the value S and the value of the correlation value N;
A fourth step for testing whether the S / N ratio in the third step exceeds a predetermined second threshold;
A fifth step of outputting an OK signal indicating recognition of the UW signal when the test in the fourth step is yes;
It has the composition provided with.

本発明を実施することにより、雑音によるＵＷ信号の誤認識防止の効果を得ることができる。   By implementing the present invention, the effect of preventing erroneous recognition of UW signals due to noise can be obtained.

図面により実施例を示し、本発明を詳細に説明する。
図１は本発明の構成を示すブロック図である。
１は受信側を送信側のデータのタイミングに同期させるためにデータに付加された同期用の符号である予め定めたＵＷ（Unique Word ）を発生するＵＷ発生器である。
２は送信側から伝送され受信された受信復調信号とＵＷ発生器１から出力されるＵＷ符号との間で相互相関を算出し相関値を出力するＵＷ相関器である。
３はＵＷ相関器２の出力である相関値を概ね受信復調信号の１フレーム分の時間長の間メモリに蓄積し任意のタイミングで読み出した相関値を出力するようにした相関値バッファメモリである。
４は相関値バッファメモリ３の読み出しタイミングに整合させたタイミングに受信復調信号を出力させる受信復調信号バッファメモリである。
５は相関値バッファメモリ３から読み出した相関値が予め定めたしきい値を超えた相関ピーク値を検出し、相関ピーク値前後の任意の小幅の相関値を出力する相関ピーク値検出器である。
６は相関ピーク値検出器５の出力である相関ピーク値前後の任意の小幅の相関値を積算して電力量Ｓとした値を算出し出力する相関値Ｓ算出器である。
７は相関ピーク値検出器５の出力である相関ピーク値前後の任意の小幅の相関値以外の相関値を積算して電力量Ｎとした値を算出し出力する相関値Ｎ算出器である。
８は相関値Ｓ算出器６の出力である相関値Ｓと相関値Ｎ算出器７の出力である相関値Ｎとの比を算出し予め定めたしきい値と比較し結果として相関ピーク値選択信号を出力する相関値Ｓ／Ｎ算出・比較器である。
９は相関ピーク値検出器５の出力である相関ピーク値および相関値Ｓ／Ｎ算出・比較器８の出力である相関ピーク値選択信号を入力として、真の同期位置を示す相関ピーク値を判定し同期位置パルスを出力する同期位置判定器である。
１０は受信復調信号バッファメモリ４の出力である受信復調信号および同期位置判定器９の出力である同期位置パルスを入力として受信復調信号のフレーム同期位置が認識され、これによってデータ信号を出力するフレーム同期回路である。 Embodiments will be described with reference to the drawings, and the present invention will be described in detail.
FIG. 1 is a block diagram showing the configuration of the present invention.
Reference numeral 1 denotes a UW generator for generating a predetermined UW (Unique Word) which is a synchronization code added to data in order to synchronize the receiving side with the timing of data on the transmitting side.
Reference numeral 2 denotes a UW correlator that calculates a cross-correlation between a received demodulated signal transmitted and received from the transmission side and a UW code output from the UW generator 1 and outputs a correlation value.
Reference numeral 3 denotes a correlation value buffer memory in which the correlation value output from the UW correlator 2 is stored in the memory for a time length corresponding to one frame of the received demodulated signal, and the correlation value read at an arbitrary timing is output. .
Reference numeral 4 denotes a received demodulated signal buffer memory that outputs a received demodulated signal at a timing matched with the read timing of the correlation value buffer memory 3.
Reference numeral 5 denotes a correlation peak value detector that detects a correlation peak value in which the correlation value read from the correlation value buffer memory 3 exceeds a predetermined threshold value, and outputs an arbitrary small correlation value before and after the correlation peak value. .
Reference numeral 6 denotes a correlation value S calculator that calculates and outputs a value obtained by integrating arbitrary small correlation values before and after the correlation peak value, which is an output of the correlation peak value detector 5, as an electric energy S.
Reference numeral 7 denotes a correlation value N calculator that calculates and outputs a value obtained by integrating the correlation values other than an arbitrary small correlation value before and after the correlation peak value, which is an output of the correlation peak value detector 5, as an electric energy N.
8 calculates the ratio between the correlation value S output from the correlation value S calculator 6 and the correlation value N output from the correlation value N calculator 7 and compares it with a predetermined threshold value. As a result, a correlation peak value is selected. It is a correlation value S / N calculator / comparator that outputs a signal.
9 receives the correlation peak value output from the correlation peak value detector 5 and the correlation peak value selection signal output from the correlation value S / N calculator / comparator 8 and determines the correlation peak value indicating the true synchronization position. The synchronous position determiner outputs a synchronous position pulse.
10 is a frame in which the received demodulated signal which is the output of the received demodulated signal buffer memory 4 and the sync position pulse which is the output of the sync position determiner 9 are input to recognize the frame sync position of the received demodulated signal, thereby outputting a data signal. It is a synchronous circuit.

本発明における受信復調信号内のノイズに対する信号の割合の求め方について以下に示す。図２はＵＷ相関器２の出力である相関値の時間軸波形であり、希望信号の成分量に比較し雑音の成分量が極めて少ない、良好な受信状況のときを模した相関値の特性図である。
図２に示すように、相関値バッファメモリ３から読み出した相関値が予め定めたしきい値（ａ０）を超えた相関ピーク値（ｐ０）を検出し、相関ピーク値（ｐ０）前後の任意の小幅（ｄ０）の相関値を積算して電力量Ｓとした値を算出し相関値Ｓ０（３−１）として得られた信号成分である。
また、相関値バッファメモリ３から読み出した相関値が予め定めたしきい値（ａ０）を超えた相関ピーク値（ｐ０）を検出し、相関ピーク値（ｐ０）前後の任意の小幅（ｄ０）を除いた範囲（ｅ）の相関値を積算して電力量Ｎとした値を算出し相関値Ｎ（３−２）として得られた雑音成分である。
得られた相関値Ｓ０（３−１）と相関値Ｎ（３−２）との比（Ｓ０／Ｎ）を算出し予め定めたＳ／Ｎ比を判定するしきい値と比較し結果としてＵＷ信号の認識に用いる。 The method for obtaining the ratio of the signal to the noise in the received demodulated signal in the present invention will be described below. FIG. 2 is a time-axis waveform of the correlation value that is the output of the UW correlator 2, and a correlation value characteristic diagram simulating a good reception situation in which the noise component amount is extremely small compared to the component amount of the desired signal. It is.
As shown in FIG. 2, to detect a threshold correlation value read from the correlation value buffer memory 3 is predetermined (a 0) of the correlation peak values exceeding (p 0), the correlation peak value (p 0) before and after Is a signal component obtained by calculating a value obtained as an electric energy S by integrating the correlation values of an arbitrary small width (d 0 ), and obtaining the correlation value S 0 (3-1).
Further, the correlation values correlation values read from the buffer memory 3 is a predetermined threshold value (a 0) of the correlation peak values exceeding (p 0) to detect a correlation peak value (p 0) before and after any slight ( This is a noise component obtained as a correlation value N (3-2) by calculating a value obtained by integrating the correlation values in the range (e) excluding d 0 ) to obtain an electric energy N.
The ratio (S 0 / N) between the obtained correlation value S 0 (3-1) and the correlation value N (3-2) is calculated and compared with a threshold value for determining a predetermined S / N ratio. Used for UW signal recognition.

図３はＵＷ相関器２の出力である相関値の時間軸波形であり、希望信号の成分量に比較し雑音の成分量が極めて多い、あるいは雑音の成分のみであるような、不良な受信状況のときを模した相関値の特性図である。
図３に示すように、相関値バッファメモリ３から読み出した相関値が予め定めたしきい値（ａ０）を超えた相関ピーク値（ｐ１、ｐ２、ｐ３）を検出し、相関ピーク値（ｐ１、ｐ２、ｐ３）それぞれの前後の任意の小幅（ｄ１、ｄ２、ｄ３）の相関値をそれぞれ積算して電力量Ｓ１、Ｓ２、Ｓ３とした値を算出し相関値Ｓ１、Ｓ２、Ｓ３として得られた複数の偽りを含む信号成分である。
また、相関値バッファメモリ３から読み出した相関値が予め定めたしきい値（ａ０）を超えた相関ピーク値（ｐ１、ｐ２、ｐ３）を検出し、相関ピーク値（ｐ１、ｐ２、ｐ３）のそれぞれの前後の任意の小幅（ｄ１、ｄ２、ｄ３）を除いた範囲（ｅ）の相関値を積算して電力量Ｎとした値を算出し相関値Ｎとして得られた雑音成分である。
得られた相関値Ｓ１、Ｓ２、Ｓ３と相関値Ｎとのそれぞれの比（Ｓ１／Ｎ、Ｓ２／Ｎ、Ｓ３／Ｎ）を算出し予め定めたＳ／Ｎ比を判定するしきい値と比較し結果として相関ピーク値選択信号を出力させＵＷ信号の認識に用いる。
このように、受信復調信号に雑音（ノイズ）が混入した時には、Ｎの値が高くなることによりＳ／Ｎ比の値が低くなる。
このことを用いてＳ／Ｎ比の値にしきい値を設けて比較することでノイズ受信時のＵＷの誤認識を防止し易くなる。 FIG. 3 is a time-axis waveform of the correlation value output from the UW correlator 2, and the reception condition is bad such that the amount of noise component is extremely large compared to the amount of component of the desired signal or only the noise component. FIG. 6 is a characteristic diagram of a correlation value simulating that time.
As shown in FIG. 3, a correlation peak value (p 1 , p 2 , p 3 ) in which the correlation value read from the correlation value buffer memory 3 exceeds a predetermined threshold value (a 0 ) is detected, and the correlation peak is detected. The values (p 1 , p 2 , p 3 ) before and after the arbitrary small widths (d 1 , d 2 , d 3 ) are integrated to obtain values of electric power S 1 , S 2 , S 3 , respectively. It is a signal component including a plurality of false values calculated and obtained as correlation values S 1 , S 2 , and S 3 .
Further, a correlation peak value (p 1 , p 2 , p 3 ) in which the correlation value read from the correlation value buffer memory 3 exceeds a predetermined threshold value (a 0 ) is detected, and the correlation peak value (p 1 , p 2 , p 3 ) is calculated by adding the correlation values in the range (e) excluding any small widths (d 1 , d 2 , d 3 ) before and after each to calculate the electric energy N, and calculating the correlation value N Is a noise component obtained as follows.
The ratios (S 1 / N, S 2 / N, S 3 / N) of the obtained correlation values S 1 , S 2 , S 3 and the correlation value N are calculated to determine a predetermined S / N ratio. As a result, a correlation peak value selection signal is output and used for recognition of the UW signal.
As described above, when noise (noise) is mixed in the received demodulated signal, the value of N increases, and the value of the S / N ratio decreases.
By using this fact and providing a threshold value for the value of the S / N ratio, it becomes easy to prevent erroneous recognition of UW during noise reception.

図３は、本発明の動作を示すフロー図であって、
ＵＷ認識を行う動作の開始ステップ（ＳＴ０）、
（ＳＴ０）ステップの後、ＵＷ相関器２にて、受信復調信号とＵＷ発生器１から出力される受信側で既知のＵＷ信号（符号列）との間で相関値の算出（１−３）を行うステップ（ＳＴ１）、
ステップ（ＳＴ１）の後、相関値相関ピーク値検出器５にて、算出された相関値からピーク値を求め、この相関値のピーク値が予め定めた第一のしきい値（ａ０）を超えるかのテストを行ない、超えていれば相関ピーク値（ｐ）として認識され、更に、相関ピーク値（ｐ）前後の任意の小幅（ｄ）の相関値を出力するステップ（ＳＴ２）、
このステップ（ＳＴ２）テストが「ｙｅｓ」の場合に、相関値Ｓ算出器６にて相関ピーク値（ｐ）前後の任意の小幅（ｄ）の相関値Ｓを算出し、相関値Ｎ算出器７にて、相関ピーク値（ｐ）前後の任意の小幅（ｄ）の相関値以外の相関値Ｎを算出し、相関値Ｓ／Ｎ算出・比較器８にて、相関値Ｓと相関値Ｎとの比である「Ｓ／Ｎ比」の値を算出するステップ（ＳＴ３）、
またステップ（ＳＴ２）のテストが「ｎｏ」のときに、「ＵＷ認識ＮＧ」となり、フレーム同期制御は行われず、ＵＷ認識を行う動作の終了とするステップ（ＳＴ６）、
次にステップ（ＳＴ３）の後、相関値Ｓ／Ｎ算出・比較器８にて、相関値Ｓと相関値Ｎとの比である「Ｓ／Ｎ比」の値を算出された結果、「Ｓ／Ｎ比」が予め定めたＳ／Ｎ比を判定する第２のしきい値を超えるかのテスト（比較テスト）を行うステップ（ＳＴ４）、
このステップ（ＳＴ４）テストが「ｙｅｓ」である場合に、受信信号に含まれているＵＷ信号を認識し「ＵＷ認識ＯＫ」を出力し、フレーム同期制御が行われ、ＵＷ認識を行う動作の終了とするステップ（ＳＴ５）、
ステップ（ＳＴ４）テストが「ｎｏ」のときに、「ＵＷ認識ＮＧ」となり、フレーム同期制御は行われず、ＵＷ認識を行う動作の終了とするステップ（ＳＴ６）、
によって構成されている。 FIG. 3 is a flowchart showing the operation of the present invention.
An operation start step (ST0) for performing UW recognition;
(ST0) After the step, the UW correlator 2 calculates the correlation value between the received demodulated signal and the UW signal (code string) known on the receiving side output from the UW generator 1 (1-3) Performing step (ST1),
After step (ST1), the correlation value correlation peak value detector 5 obtains a peak value from the calculated correlation value, and the peak value of this correlation value is set to a predetermined first threshold value (a 0 ). A test is performed to determine whether or not the correlation peak value (p) is exceeded, and a correlation value having an arbitrary width (d) before and after the correlation peak value (p) is output (ST2).
When this step (ST2) test is “yes”, the correlation value S calculator 6 calculates a correlation value S having an arbitrary width (d) before and after the correlation peak value (p), and the correlation value N calculator 7 Then, a correlation value N other than the correlation value having an arbitrary width (d) before and after the correlation peak value (p) is calculated, and the correlation value S / N calculation / comparator 8 calculates the correlation value S and the correlation value N. A step of calculating a value of “S / N ratio” which is a ratio of (ST3),
Further, when the test in step (ST2) is “no”, the step becomes “UW recognition NG”, the frame synchronization control is not performed, and the operation for performing the UW recognition ends (ST6),
Next, after step (ST3), the correlation value S / N calculation / comparator 8 calculates the value of the “S / N ratio”, which is the ratio of the correlation value S and the correlation value N. As a result, “S A step (ST4) of performing a test (comparison test) on whether or not the “/ N ratio” exceeds a second threshold value for determining a predetermined S / N ratio;
When this step (ST4) test is “yes”, the UW signal included in the received signal is recognized, “UW recognition OK” is output, the frame synchronization control is performed, and the operation of performing UW recognition ends. Step (ST5),
Step (ST4) When the test is “no”, it becomes “UW recognition NG”, the frame synchronization control is not performed, and the operation of performing the UW recognition is terminated (ST6),
It is constituted by.

本発明は、移動通信に用いられる受信装置における同期信号の検知等に適用することができる。   The present invention can be applied to detection of a synchronization signal in a receiving apparatus used for mobile communication.

本発明の構成を説明するためのブロック図である。It is a block diagram for demonstrating the structure of this invention. 本発明の構成及び作用を説明するための特性図である。It is a characteristic view for demonstrating the structure and effect | action of this invention. 本発明の構成及び作用を説明するための特性図である。It is a characteristic view for demonstrating the structure and effect | action of this invention. 本発明の動作を説明するためのフローチャートである。It is a flowchart for demonstrating operation | movement of this invention. 従来技術を説明するための特性図である。It is a characteristic view for demonstrating a prior art. 従来技術の動作を説明するためのフローチャートである。It is a flowchart for demonstrating operation | movement of a prior art. 従来技術の問題点を説明するための特性図である。It is a characteristic view for demonstrating the problem of a prior art. 従来技術の問題点を説明する特性図である。It is a characteristic view explaining the problem of a prior art.

符号の説明Explanation of symbols

１ ＵＷ発生器
２ ＵＷ相関器
３ 相関値バッファメモリ
４ 受信復調信号バッファメモリ
５ 相関ピーク値検出器
６ 相関値Ｓ算出器
７ 相関値Ｎ算出器
８ 相関値Ｓ／Ｎ算出・比較器
９ 同期位置判定器
１０ フレーム同期回路
1 UW generator 2 UW correlator 3 correlation value buffer memory 4 received demodulated signal buffer memory 5 correlation peak value detector 6 correlation value S calculator 7 correlation value N calculator 8 correlation value S / N calculator / comparator 9 synchronization position Determinator 10 Frame synchronization circuit

Claims (1)

受信信号に含まれているＵＷ信号を認識するために、
前記受信信号と受信側で既知のＵＷ信号との相関値を算出する第一のステップと、
該相関値のピーク値が予め定めた第一のしきい値を越えるかのテストをする第二のステップと、
該第二のステップにおける前記テストがｙｅｓである場合に、前記相関値のピーク値から相関値Ｓを算出し、該相関値Ｓの周囲の相関値から相関値Ｎを算出し、更に、該相関値Ｓ及び該相関値Ｎの値からＳ／Ｎ比を算出する第三のステップと、
該第三のステップにおけるＳ／Ｎ比が予め定めた第二のしきい値を越えるかのテストをする第四のステップと、
該第四のステップにおける前記テストがｙｅｓである場合にＵＷ信号の認識を示すＯＫ信号を出力する第五のステップと、
を備えたＵＷ信号の検出方法。 In order to recognize the UW signal included in the received signal,
A first step of calculating a correlation value between the received signal and a known UW signal on the receiving side;
A second step of testing whether the peak value of the correlation value exceeds a predetermined first threshold;
When the test in the second step is yes, the correlation value S is calculated from the peak value of the correlation value, the correlation value N is calculated from the correlation values around the correlation value S, and the correlation A third step of calculating the S / N ratio from the value S and the value of the correlation value N;
A fourth step for testing whether the S / N ratio in the third step exceeds a predetermined second threshold;
A fifth step of outputting an OK signal indicating recognition of the UW signal when the test in the fourth step is yes;
A UW signal detection method comprising:
JP2004332660A 2004-11-17 2004-11-17 Method for detecting uw signal Pending JP2006148276A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014115693A1 (en) * 2013-01-23 2014-07-31 国立大学法人山口大学 Synchronization capture method, synchronization capture circuit and wireless communication system
JP2019165377A (en) * 2018-03-20 2019-09-26 株式会社東芝 Frame synchronization method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014115693A1 (en) * 2013-01-23 2014-07-31 国立大学法人山口大学 Synchronization capture method, synchronization capture circuit and wireless communication system
JP2019165377A (en) * 2018-03-20 2019-09-26 株式会社東芝 Frame synchronization method

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