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1. 发明授权

US08428197B2 Enhanced channel estimation for communication system receiver 失效
标题翻译：通信系统接收机的增强信道估计
公开(公告)号：US08428197B2
公开(公告)日：2013-04-23
申请号：US11445735
申请日：2006-06-01
申请人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
发明人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
IPC分类号： H04L27/06
CPC分类号： H04L25/0212 , H04L5/0023 , H04L25/022 , H04L25/0228 , H04L25/0232 , H04L27/2647
摘要： An embodiment of the present invention is a technique to process signals in a communication system. A channel impulse response (CIR) generator generates a time-domain windowed CIR from a received signal using a window function. A thresholder thresholds the time-domain windowed CIR. A compensator compensates window effect for the thresholded time-domain windowed CIR to provide an enhanced channel estimate in frequency domain.
摘要翻译：本发明的实施例是一种在通信系统中处理信号的技术。信道脉冲响应（CIR）发生器使用窗口函数从接收到的信号生成时域窗口CIR。阈值阈值限制了时域窗口的CIR。补偿器补偿阈值时域窗口CIR的窗口效应，以在频域中提供增强的信道估计。

2. 发明授权

US08385488B2 Inter-cell interference mitigation method using spatial covariance matrix estimation method for inter-cell interference mitigation of MIMO antenna OFDM system 有权
标题翻译：使用空间协方差矩阵估计方法对MIMO天线OFDM系统进行小区间干扰减轻的小区间干扰减轻方法
公开(公告)号：US08385488B2
公开(公告)日：2013-02-26
申请号：US13319691
申请日：2009-09-15
申请人： Hyung-Jin Choi , Jun-Hee Jang , Jung-Su Han
发明人： Hyung-Jin Choi , Jun-Hee Jang , Jung-Su Han
IPC分类号： H04B7/10 , H04L1/02
CPC分类号： H04L25/022 , H04B7/0891 , H04L25/021 , H04L25/0228
摘要： Disclosed is an inter-cell interference mitigation method using a spatial covariance matrix (SCM) estimation method in a multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) communication system for mitigating interference between asynchronous cells. The inter-cell interference mitigation method includes extracting a reference symbol (RS) of a received OFDM symbol and performing channel estimation, estimating an initial SCM using the RS signal and the channel estimation result, applying time-domain sinc type weighting to the initial SCM and applying an SCM, and demodulating a data symbol with mitigated inter-cell interference using the channel estimation result and the estimated SCM. By applying time-domain sinc type weighting to SCM estimation, it is possible to reduce an SCM estimation error occurring due to a spectral leakage induced by an abrupt change in a signal at a border point between an effective sub carrier zone and a guard band zone, and a simple design of a moving average filter form for a frequency domain signal can be made instead of frequency-time-frequency domain transformation using an inverse fast Fourier transform (IFFT) and fast Fourier transfer (FFT).
摘要翻译：公开了一种在多输入多输出（MIMO）正交频分复用（OFDM）通信系统中使用空间协方差矩阵（SCM）估计方法的小区间干扰减轻方法，用于减轻异步小区之间的干扰。小区间干扰减轻方法包括提取接收的OFDM符号的参考符号（RS）并执行信道估计，使用RS信号和信道估计结果估计初始SCM，对初始SCM应用时域sinc类型加权以及应用SCM，以及使用信道估计结果和估计的SCM来解调具有减轻的小区间干扰的数据符号。通过对SCM估计应用时域sinc类型加权，可以减少由于在有效子载波区域和保护带区域之间的边界点处的信号的突然变化引起的频谱泄漏而发生的SCM估计误差，并且可以使用快速傅里叶逆变换（FFT）和快速傅立叶转换（FFT）来代替频域信号的移动平均滤波器形式的简单设计来代替频率 - 时域变换。

3. 发明授权

US08351550B2 Correlation apparatus and method for frequency synchronization in broadband wireless access communication system 有权
标题翻译：宽带无线接入通信系统中频率同步的相关装置和方法
公开(公告)号：US08351550B2
公开(公告)日：2013-01-08
申请号：US12363484
申请日：2009-01-30
申请人： Hee-Jin Roh , Jeoung-Gil Lee , Su-Jin Yoon , Hoon Kang , Chang-Hyun Baik , Jun-Kyu Kang , Hyung-Jin Choi , Se-Bin Im , Dae-Hong Lee
发明人： Hee-Jin Roh , Jeoung-Gil Lee , Su-Jin Yoon , Hoon Kang , Chang-Hyun Baik , Jun-Kyu Kang , Hyung-Jin Choi , Se-Bin Im , Dae-Hong Lee
IPC分类号： H03D1/00
CPC分类号： H04L27/2688 , H04L27/2659 , H04L27/2672 , H04L27/2675
摘要： A correlation apparatus and method for frequency synchronization are provided. A frequency synchronization method of a receiver in a broadband wireless access communication system includes acquiring a highest correlation value by conducting a differential correlation of a variable interval between a received signal and a reference signal and performing a frequency synchronization according to the highest correlation value.
摘要翻译：提供了一种用于频率同步的相关装置和方法。宽带无线接入通信系统中的接收机的频率同步方法包括通过对接收信号和参考信号进行可变间隔的差分相关，并根据最高相关值进行频率同步来获取最高相关值。

4. 发明授权

US08275059B2 Frequency synchronization apparatus and method in OFDM system 失效
标题翻译： OFDM系统中的频率同步装置和方法
公开(公告)号：US08275059B2
公开(公告)日：2012-09-25
申请号：US12477269
申请日：2009-06-03
申请人： Bon Young Koo , Hyung Jin Choi , Se Bin Im , Jung In Kim
发明人： Bon Young Koo , Hyung Jin Choi , Se Bin Im , Jung In Kim
IPC分类号： H04L27/28
CPC分类号： H04L27/2657 , H04L27/2676 , H04L27/2688
摘要： A frequency synchronization apparatus includes: a correlating unit that obtains a first correlation value by correlating a known reference guard interval of an OFDM symbol and a reference copy interval corresponding to the reference guard interval, and obtains a second correlation value by correlating the estimate guard interval and an estimate copy interval corresponding to the estimate guard interval; a determining unit that compares the first and second correlation values to determine a first case where the first correlation value is larger by a pre-set magnification than the second correlation value, a second case where the second correlation value is larger by a pre-set magnification than the first correlation value, and a third case which is not the first case nor the second case; and a frequency offset estimating unit that estimates a frequency offset by using a correlation value corresponding to any one of the first to third.
摘要翻译：频率同步装置包括：相关单元，通过将OFDM符号的已知参考保护间隔与对应于参考保护间隔的参考复制间隔相关联来获得第一相关值，并且通过将估计保护间隔以及对应于估计保护间隔的估计复制间隔; 确定单元，其比较所述第一和第二相关值，以确定所述第一相关值比所述第二相关值大预定倍数的第一情况，所述第二相关值大于预设值的第二情况并且不是第一种情况的第三种情况也不是第二种情况; 以及频率偏移估计单元，其通过使用与第一至第三中的任一个相对应的相关值来估计频率偏移。

5. 发明申请

US20120134453A1 METHOD FOR DEMODULATING RECEIVED SIGNALS AND APPARATUS THEREFORE 有权
标题翻译：用于解调接收到的信号的方法及其装置
公开(公告)号：US20120134453A1
公开(公告)日：2012-05-31
申请号：US13388848
申请日：2010-08-04
申请人： Hyung-Jin Choi , Young-Il Min , Se-Bin Im
发明人： Hyung-Jin Choi , Young-Il Min , Se-Bin Im
IPC分类号： H04L27/06
CPC分类号： H04L27/0012
摘要： Disclosed are a method for demodulating received signals and an apparatus therefore which can maintain quality of signals and can reduce computational complexity. A demodulation method of a receiving device for receiving a plurality of signals modulated through a M-ary (M is a natural number of 1 or more) modulation method includes: comparing channel frequency response power of a first channel with channel frequency response power of a second channel, selecting M reference signals on the basis of the compared result, selecting corresponding signals paired with respective selected M reference signals, and estimating transmitting signals from the M signal pairs including pairs of the reference signal and the corresponding signal. Accordingly, the computational complexity is reduced from O (M2) to O (M).
摘要翻译：公开了一种用于解调接收信号的方法以及因此可以保持信号质量并且可以降低计算复杂度的装置。一种用于接收通过M进制调制的多个信号的接收装置的解调方法（M是1或更多的自然数）调制方法包括：将第一信道的信道频率响应功率与信道频率响应功率进行比较，第二通道，基于比较结果选择M个参考信号，选择与各自选择的M个参考信号配对的相应信号，以及估计来自包括参考信号和相应信号对的M个信号对的发送信号。因此，计算复杂度从O（M2）减少到O（M）。

6. 发明授权

US07319660B2 Device and method for symbol frame synchronization of OFDM transmitter and receiver 有权
标题翻译： OFDM发射机和接收机的符号帧同步的装置和方法
公开(公告)号：US07319660B2
公开(公告)日：2008-01-15
申请号：US10412262
申请日：2003-04-14
申请人： Ki-yun Kim , Ho Kim , Jun-yun Lee , Hyung-jin Choi
发明人： Ki-yun Kim , Ho Kim , Jun-yun Lee , Hyung-jin Choi
IPC分类号： H04J11/00
CPC分类号： H04L27/2613 , H04L27/2656
摘要： Provided is a frame synchronization pattern design and synchronization method by which in a transmitter of a communications system employing an orthogonal frequency division multiplexing (OFDM), a frame synchronization pattern is inserted into the starting part of a symbol frame, and by detecting the frame synchronization pattern in a receiver, synchronization of the OFDM transmitter and receiver is performed. Also, provided are a transmitter synchronization apparatus including an OFDM symbol frame generation unit, a frame synchronization pattern insertion unit, and an OFDM transmission signal conversion unit, and a receiver synchronization apparatus comprising a frame synchronization pattern inserted OFDM symbol frame conversion unit, a frame synchronization pattern detection unit, and a source data generation unit.Overcoming the conventional notion depending on the earlier art OFDM symbol standards, the OFDM symbol frame start detection method according to the present invention places a free-length code pattern, which is separately generated in a time domain, in the starting point of a frame and detects this pattern such that accuracy and efficiency greatly improve. Also, since the power value of a received signal is detected in the method, the communications system operates regardless of the frequency offset and phase offset. In addition, since a free-length pattern can be designed, the start point of a frame can be accurately detected in a seriously fading channel, by detecting a maximum peak based on correlation.
摘要翻译：提供了一种帧同步模式设计和同步方法，在采用正交频分复用（OFDM）的通信系统的发射机中，将帧同步模式插入符号帧的起始部分，并通过检测帧同步接收机中的模式，执行OFDM发射机和接收机的同步。此外，提供了包括OFDM符号帧生成单元，帧同步码型插入单元和OFDM传输信号转换单元的发射机同步装置，以及包括帧同步码型插入OFDM符号帧转换单元的接收机同步装置，同步模式检测单元和源数据生成单元。根据本发明的OFDM符号帧起始检测方法克服了以前的OFDM符号标准的常规概念，将在时域中单独生成的自由长度码模式放在帧的起点处，检测这种模式，使得精度和效率大大提高。此外，由于在该方法中检测到接收信号的功率值，所以通信系统不管频率偏移和相位偏移如何运行。此外，由于可以设计自由长度图案，因此通过基于相关性检测最大峰值，可以在严重衰落的信道中准确地检测帧的起始点。

7. 发明申请

US20070002937A1 SYMBOL DETECTOR BASED ON FREQUENCY OFFSET COMPENSATION IN ZIGBEE SYSTEM AND SYMBOL DETECTING METHOD THEREOF 有权
标题翻译：基于ZIGBEE系统中频率偏移补偿的符号检测器及其符号检测方法
公开(公告)号：US20070002937A1
公开(公告)日：2007-01-04
申请号：US11427771
申请日：2006-06-29
申请人： SANG HYUN MIN , HYUNG JIN CHOI , JUNG SU HAN , JOO HYUN DO , TAH JOON PARK , KWANG MOOK LEE , KOON SHIK CHO , U SANG LEE
发明人： SANG HYUN MIN , HYUNG JIN CHOI , JUNG SU HAN , JOO HYUN DO , TAH JOON PARK , KWANG MOOK LEE , KOON SHIK CHO , U SANG LEE
IPC分类号： H04B1/707
CPC分类号： H04L27/2657 , H04B1/708 , H04B1/709 , H04L27/261 , H04L27/2675
摘要： The invention relates to a symbol detector for detecting symbols received in a receive modem of short-range wireless personal area network of a ZigBee system (IEEE 802.15.4). An OQPSK short-range wireless communication system according to the invention acquires frequency offset in a received signal using a symbol contained in a preamble of a packet of the signal, multi-delay-differentiates the signal by a plurality of predetermined delay times, and complex-conjugates the acquired frequency offset to eliminate the frequency offset. Then, the OQPSK short-range wireless communication system according to the invention correlates the received signal with a PN sequence delay-differentiated through the same process to detect the symbols corresponding to the received signal.
摘要翻译：本发明涉及一种用于检测在ZigBee系统（IEEE 802.15.4）的短距离无线个域网的接收调制解调器中接收的符号的符号检测器。根据本发明的OQPSK短距离无线通信系统使用包含在信号分组的前导码中的符号来获取接收信号中的频率偏移，将信号多延迟多个预定延迟时间，并且复数收集频率偏移以消除频率偏移。然后，根据本发明的OQPSK短距离无线通信系统将接收到的信号与通过相同处理延迟差分的PN序列相关，以检测对应于接收信号的符号。

8. 发明授权

US07158557B2 Channel estimation apparatus and method 有权
标题翻译：信道估计装置及方法
公开(公告)号：US07158557B2
公开(公告)日：2007-01-02
申请号：US10132800
申请日：2002-04-25
申请人： Young-Yong Lee , Kwang-Seog Bae , Jae-Min Ahn , Min-Joong Rim , Hyung-Jin Choi
发明人： Young-Yong Lee , Kwang-Seog Bae , Jae-Min Ahn , Min-Joong Rim , Hyung-Jin Choi
IPC分类号： H04B1/707
CPC分类号： H04W52/228 , H04B1/707 , H04B2201/70701 , H04L25/0232 , H04W52/08 , H04W52/223 , H04W52/225 , H04W52/58
摘要： There is provided a channel estimation apparatus for estimating a radio channel environment by multiplying a currently received bit signal of a pilot signal and previously received bit signals by weights, and summing the weighted currently received bit signal and the weighted previously received bit signals in a CDMA mobile communication system receiving the pilot signal comprised of a stream of bits having given bit values, and a power control signal comprised of power control bits. In the channel estimation, a predictor predicts a next bit signal succeeding the currently received bit signal, multiplies the predicted next bit signal by a weight, and generates a weighted next bit signal. A summer sums the weighted next bit signal from the predictor, the weighted currently received bit signal and the previously received bit signals.
摘要翻译：提供了一种信道估计装置，用于通过将导频信号的当前接收的比特信号和先前接收的比特信号乘以加权来估计无线电信道环境，并将加权的当前接收的比特信号和加权的先前接收的比特信号相加在CDMA 接收由具有给定位值的比特流组成的导频信号的移动通信系统以及由功率控制比特组成的功率控制信号。在信道估计中，预测器预测当前接收到的比特信号之后的下一比特信号，将预测的下一比特信号乘以加权，并产生加权的下一比特信号。加法器将来自预测器的加权的下一位信号，加权的当前接收的位信号和先前接收的位信号相加。

9. 发明申请

US20060079184A1 Channel estimator, demodulator, speed estimator and method thereof 有权
公开(公告)号：US20060079184A1
公开(公告)日：2006-04-13
申请号：US11240628
申请日：2005-10-03
申请人： Joo-Hyun Do , Hyung-Jin Choi , Sung-Jun Kim , Kil-Hyen Ryu
发明人： Joo-Hyun Do , Hyung-Jin Choi , Sung-Jun Kim , Kil-Hyen Ryu
IPC分类号： H04B1/00
CPC分类号： H04L25/0212 , H04L25/0222 , H04L25/0224
摘要： A channel estimator, demodulator, speed estimator and method thereof. The speed estimator may generate a speed indicator indicating a speed of a mobile device. The channel estimator may perform channel estimation based on the estimated speed indicated by the speed indicator. The demodulator may perform channel compensation based on the channel estimation performed by the channel estimator.

10. 发明授权

US06798738B1 FFT window position recovery apparatus and method for OFDM system receiver 失效
标题翻译：用于OFDM系统接收机的FFT窗口位置恢复装置和方法
公开(公告)号：US06798738B1
公开(公告)日：2004-09-28
申请号：US09509676
申请日：2000-07-25
申请人： Sang-hyun Do , Hyung-jin Choi , Hong-bae Cho
发明人： Sang-hyun Do , Hyung-jin Choi , Hong-bae Cho
IPC分类号： H04J1100
CPC分类号： H04L27/2665 , H04L27/2662 , H04N7/06
摘要： A fast Fourier transform (FFT) window position recovery apparatus in an orthogonal frequency division multiplexing (OFDM) receiver is provided. This apparatus, in an OFDM system receiver which receives an OFDM symbol comprised of a useful data interval and a guard interval and recovers a FFT window position, includes: an analog-to-digital converter (ADC) for converting a received OFDM signal into a digital complex sample; a symbol start detector for detecting a power difference between the digital complex samples output by the ADC and detecting a position having a minimum absolute value of the power difference between the samples, as a symbol starting position; and a FFT window controller for activating FFT by moving the FFT window position using symbol start information detected by the symbol start detector. The influence of frequency and phase offsets is reduced by using the power difference between adjacent samples delayed by the useful data interval, thus improving the reliability of a system.
摘要翻译：提供了一种正交频分复用（OFDM）接收机中的快速傅里叶变换（FFT）窗口位置恢复装置。该装置在接收包括有用数据间隔和保护间隔并恢复FFT窗口位置的OFDM符号的OFDM系统接收机中包括：模数转换器（ADC），用于将接收的OFDM信号转换为数字复杂样本; 符号起始检测器，用于检测由ADC输出的数字复样本之间的功率差，并检测具有样本之间的功率差的最小绝对值的位置作为符号开始位置; 以及FFT窗口控制器，用于通过使用由符号开始检测器检测的符号开始信息移动FFT窗口位置来激活FFT。通过使用延迟有用数据间隔的相邻采样之间的功率差来降低频率和相位偏移的影响，从而提高系统的可靠性。

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