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公开(公告)号：KR100873146B1
公开(公告)日：2008-12-09
申请号：KR1020070036426
申请日：2007-04-13
Applicant: 한국과학기술원
Abstract: 본 발명은 IEEE 802.16e Wireless MAN-OFDMA 시스템과 WiBro 및 Mobile WiMAX와 같은 셀룰러 OFDMA 기반의 이동통신 시스템에서 프리앰블(preamble)을 이용한 기지국 구분 기법 두 가지와 그 운용 방식에 관한 것이다. 본 발명에서는 최적 기지국 구분 기법인 ML 기법으로부터 근사 과정을 통해 두 가지의 서로 다른 기지국 구분 기법을 얻는다. 첫 번째 기법은 계산량이 적으며 주파수 선택성(frequency-selectivity)이 낮은 채널 환경에서 좋은 성능을 보인다. 두 번째 기법은 첫 번째 기법에 비해 계산량이 다소 많지만 주파수 선택성이 높은 채널 환경에서 우수한 성능을 보이고 IFFT/FFT를 통해 간단히 구현할 수 있다. 본 발명에서 제안하는 운용 방식은 이 두 가지 기법을 채널 선택성의 높고 낮음에 따라 선택적으로 사용하는 것으로서 낮은 복잡도로 높은 성능을 얻을 수 있다.
IEEE802.16, WiBro, WiMAX, OFDM, 기지국 구분 (cell identification), 프리앰블 (preamble)-
公开(公告)号：KR100909356B1
公开(公告)日：2009-07-24
申请号：KR1020080007310
申请日：2008-01-24
Applicant: 한국과학기술원
CPC classification number: H04B1/1027 , H04B1/16 , H04B7/155
Abstract: A receiving device of a duplex transmission system and an interference eliminating method thereof using a timing recovery based on amplification and transmission relay are provided to perform timing recovery about data in an over sampling region and remove the interference eliminating signal. A receiver(110) receives interference signal and data signal from amplification and transmission relay. An ADC(Analog Digital Converter) samples reception signal suitable for time delay among interference signal and data signal. A signal estimation unit uses the sampled reception signal and PSF(Pulse Shaping Filter) and estimates interference signal. An interference cancellation unit removes the interference signal in the received signal passing through ADC. A digital reception unit performs the timing recovery about the signal removing the interference signal.
Abstract translation: 提供了一种使用基于放大和传输中继的定时恢复的双工传输系统的接收设备及其干扰消除方法，以执行关于过采样区域中的数据的定时恢复并去除干扰消除信号。 接收机（110）从放大和传输中继接收干扰信号和数据信号。 ADC（模拟数字转换器）采样接收信号，适合干扰信号和数据信号之间的时间延迟。 信号估计单元使用采样接收信号和PSF（脉冲整形滤波器）并估计干扰信号。 干扰消除单元去除通过ADC的接收信号中的干扰信号。 数字接收单元执行关于去除干扰信号的信号的定时恢复。
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公开(公告)号：KR100866852B1
公开(公告)日：2008-11-04
申请号：KR1020070086859
申请日：2007-08-29
Applicant: 한국과학기술원
CPC classification number: H04L27/2621 , H04L27/2618 , H04L27/262
Abstract: A method for attenuating a PAPR(Peak-to-Average Power Ratio) using an orthogonal pilot progression in an orthogonal frequency division multiplexing system is provided to attenuate PAPR by mapping location control information one to one and allocating a pilot-phase control progression combination to minimize PAPR for input data. An orthogonal pilot progression is allocated for inputted data(S10). A phasing progression for the pilot proximity subcarrier group and the allocated orthogonal pilot progression is mapped(S20). A transmission signal is determined by allocating pilot - phasing control progression combination with the smallest PAPR(S30). A transmission pilot progression is searched by using the orthogonality of the pilot progression(S40). The transmission signal is restored by searching the phase control information mapped in the transmission pilot progression(S60).
Abstract translation: 提供了一种在正交频分复用系统中使用正交导频进行衰减PAPR（峰均功率比）的方法，以通过将位置控制信息一一映射来分配PAPR，并将导频相位控制进展组合分配给 最小化输入数据的PAPR。 为输入的数据分配正交导频进程（S10）。 映射导频邻近子载波组和分配的正交导频进程的相位进行映射（S20）。 通过分配具有最小PAPR的导频相控控制进度组合来确定发送信号（S30）。 通过使用导频进程的正交性来搜索传输导频进程（S40）。 通过搜索在发送导频进程中映射的相位控制信息来恢复发送信号（S60）。
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公开(公告)号：KR1020080092713A
公开(公告)日：2008-10-16
申请号：KR1020070036426
申请日：2007-04-13
Applicant: 한국과학기술원
CPC classification number: H04L27/2647 , H04B7/022 , H04L5/0023 , H04L5/0048 , H04L27/2626
Abstract: A method for identifying cells with preambles in a cellular OFDMA(Orthogonal Frequency Division Multiple Access) system is provided to obtain high performance with low complexity by obtaining two difference cell identification techniques through an approximation process from an ML(Maximum Likelihood) technique and selectively using either of them according to channel selectivity. A control part initializes "k", a selection variable to select a cell identification scheme, to "0"(S501). Then the control part uses the first identification technique to execute cell identification and obtains a cell identifier(S502). If the control part succeeds in ND-frame consecutive data period decoding through the obtained cell identifier, the control part finishes cell identification(S503). In case ND-frame consecutive data period decoding failed, the control part adds "1" to k and compares k with "NA"(S504,S505). If k is larger than NA, the control part applies the second identification technique to execute cell identification and obtains a cell identifier(S506). If the control part succeeds in ND-frame consecutive data period decoding through the obtained cell identifier, the control part finishes cell identification(S507).
Abstract translation: 提供了一种用于在蜂窝OFDMA（正交频分多址）系统中识别具有前导码的小区的方法，以通过从ML（最大似然）技术的近似过程获得两个差异小区识别技术来获得具有低复杂度的高性能，并且选择性地使用 他们中的任何一个根据通道选择性。 控制部分将“k”作为选择单元识别方案的选择变量初始化为“0”（S501）。 然后，控制部使用第一识别技术来执行小区识别，并获得小区标识符（S502）。 如果控制部分通过获取的小区标识符成功地进行ND帧连续数据周期解码，则控制部分完成小区标识（S503）。 在ND帧连续数据周期解码失败的情况下，控制部分将“1”加到k，并将k与“NA”进行比较（S504，S505）。 如果k大于NA，则控制部分应用第二识别技术来执行小区标识并获得小区标识符（S506）。 如果控制部分通过获取的小区标识符成功地进行ND帧连续数据周期解码，则控制部分完成小区标识（S507）。
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