FRAME SYNC DEVICE AND MEASURING APPARATUS INCLUDING THE SAME AND FRAME SYNC METHOD AND METHOD FOR MEASUREMENT

To provide a frame sync device capable of detecting the frame head position accurately, even when the signal quality is relatively poor.SOLUTION: A frame sync device 30 includes a reference data row storage section 41 for storing a reference data row, a reference data shift part 32 for determining t...

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Hauptverfasser: DONG PENG, SHIOZAWA YOSHIHIRO, SUZUKI JUNYA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a frame sync device capable of detecting the frame head position accurately, even when the signal quality is relatively poor.SOLUTION: A frame sync device 30 includes a reference data row storage section 41 for storing a reference data row, a reference data shift part 32 for determining the reference data in the input signal and sequentially shifting the reference data, a complex conjugate product data row generation part 42 for generating a complex conjugate product data row from the reception data row and the reference data row in a range of prescribed number of samples from the reference data of the input signal, a data domain setting section 31 for setting the head side data domain and the tail side data domain of the complex conjugate product data, a correlation value calculation section 44 for calculating the correlation value by performing correlation operation between each data of the head side data domain and each data of the tail side data domain, every time when the reference data is determined by the reference data shift part, and a head position detector 34 for detecting the head position of the frame on the basis of the correlation value.SELECTED DRAWING: Figure 1 【課題】信号品質が比較的悪い場合でも、フレーム先頭位置を正確に検出することができるフレーム同期装置を提供する。【解決手段】フレーム同期装置30は、参照データ列を記憶する参照データ列記憶部41と、入力信号において基準データを定めて基準データを順次シフトする基準データシフト部32と、入力信号の基準データから所定サンプル数の範囲の受信データ列と参照データ列とから複素共役積データ列を生成する複素共役積データ列生成部42と、複素共役積データ列の先頭側データ領域、及び末尾側データ領域を設定するデータ領域設定部31と、基準データシフト部により基準データが定められるごとに、先頭側データ領域の各データと末尾側データ領域の各データとの間で相関演算を行って相関値を算出する相関値算出部44と、相関値に基づいてフレームの先頭位置を検出する先頭位置検出部34と、を備える。【選択図】図1