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公开(公告)号：KR100649677B1
公开(公告)日：2006-11-27
申请号：KR1020050058478
申请日：2005-06-30
Applicant: 삼성전기주식회사
Abstract: A symbol detector based on a frequency error correction in a zigbee system and a method for detecting a symbol using the same are provided to detect a symbol by estimating a frequency error and correcting the frequency error based on one symbol included in a preamble. A frequency error estimating unit(310) acquires a frequency error element existed in a receiving signal based on a specific symbol included in a preamble of the receiving signal packet. A multi delay differentiating filter(240) multi-delay-differentiates the receiving signal to a predetermined plurality of delay time. A multi frequency error correction unit(320) corrects a frequency error by calculating the frequency error element acquired by the frequency error estimating unit(310) and the receiving signal multi-delay-differentiated by the multi delay differentiating filter(240) with a complex conjugate. A plurality of multi correlators are calculated to be correlated in real number with the delay-differentiated PN sequence by the same scheme with the multi delay differentiating filter(240) to an output value of the multi frequency error correction unit. The plurality of multi correlators responds to a symbol of the receiving signal. A plurality of adders(340) adds the output values of the multi correlators. A maximum value selector(350) selects a maximum value of the output values of the plurality of adders(340).
Abstract translation: 提供了一种基于zigbee系统中的频率误差校正的符号检测器以及使用该符号检测器来检测符号的方法，以通过估计频率误差并基于包括在前导码中的一个符号校正频率误差来检测符号。 频率误差估计单元（310）基于包括在接收信号分组的前导码中的特定符号来获取接收信号中存在的频率误差分量。 多延迟微分滤波器（240）将接收信号多延迟微分为预定的多个延迟时间。 多频率误差校正单元（320）通过计算由频率误差估计单元（310）获取的频率误差元素和由多延迟微分滤波器（240）用复数延迟微分的接收信号来校正频率误差 共轭。 通过与多延迟微分滤波器（240）相同的方案，计算多个多相关器与延迟微分PN序列的实数与多频率误差校正单元的输出值的相关性。 多个多相关器响应接收信号的符号。 多个加法器（340）将多相关器的输出值相加。 最大值选择器（350）选择多个加法器（340）的输出值的最大值。
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公开(公告)号：KR1020070056921A
公开(公告)日：2007-06-04
申请号：KR1020060075379
申请日：2006-08-09
Applicant: 삼성전기주식회사
Abstract: A timing estimator of an OQPSK(Offset Quadrature Phase Shift Keying) modulator is provided to attenuate frequency error by using a phase difference between a conjugate complex number signal of a receiving signal with a delayed estimation time and the receiving signal. A timing estimator of an OQPSK modulator includes an A/D converter(100), a differential circuit unit(200), a correlation operating unit(300), and a synchronization detecting unit(400). The A/D converter(100) converts an analog receiving signal to a digital receiving signal. The differential circuit unit(200) delays the digital receiving signal from the A/D converter(100) for a predetermined time, calculates a phase difference between a conjugate complex number signal of the delayed digital receiving signal, and the digital receiving signal from the A/D converter(100), and offsets a frequency error in the digital receiving signal. The correlation operating unit(300) performs a correlation operation of a reference symbol differentiated by the same method with the differentiation of the differential circuit unit(200), and the receiving signals from the differentiation circuit unit(200), and calculates each correlation value. The synchronization detecting unit(400) detects a synchronization time based on the correlation value from the correlation operating unit(300).
Abstract translation: 提供OQPSK（偏移正交相移键控）调制器的定时估计器，以通过使用具有延迟估计时间的接收信号的共轭复数信号与接收信号之间的相位差来衰减频率误差。 OQPSK调制器的定时估计器包括A / D转换器（100），差分电路单元（200），相关运算单元（300）和同步检测单元（400）。 A / D转换器（100）将模拟接收信号转换成数字接收信号。 差分电路单元（200）将来自A / D转换器（100）的数字接收信号延迟预定时间，计算延迟的数字接收信号的共轭复数信号与来自该数字接收信号的数字接收信号之间的相位差 A / D转换器（100），并且抵消数字接收信号中的频率误差。 相关运算单元（300）通过差分电路单元（200）的微分以及来自微分电路单元（200）的接收信号，进行用相同方法区分的参考符号的相关运算，并且计算每个相关值 。 同步检测单元（400）根据来自相关运算单元（300）的相关值来检测同步时间。
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公开(公告)号：KR100764356B1
公开(公告)日：2007-10-08
申请号：KR1020060075379
申请日：2006-08-09
Applicant: 삼성전기주식회사
Abstract: 본 발명의 OQPSK 복조기의 타이밍 추정기는, 아날로그 수신신호(Ir,Qr)를 디지털 수신신호(r(k))로 변환하는 A/D 컨버터; 상기 A/D 컨버터로부터의 디지털 수신신호를 기설정된 시간만큼 지연시킨 후, 상기 지연된 디지털 수신신호의 공액 복소수 신호(r(k-1Tc))와 상기 A/D 컨버터로부터의 디지털 수신신호(r(k))를 위상 차분하여, 상기 디지털 수신신호(r(k))에 존재하는 주파수 오차를 상쇄시키는 미분회로부; 상기 미분회로부의 미분과 동일한 방식으로 미분된 기준 심볼과 상기 미분회로부로부터의 수신신호와의 상관 연산을 수행하여 각 상관값을 구하는 상관 연산부; 및 상기 상관 연산부로부터의 상관값에 기초해서 동기 시점을 검출하는 동기 검출부를 포함한다.
Zigbee 수신기, OQPSK 복조기, 타이밍 추정기
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