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公开(公告)号：US20100008346A1
公开(公告)日：2010-01-14
申请号：US12376157
申请日：2008-02-01
CPC分类号： H04L25/0228 , H04L25/06 , H04L27/2647
摘要： An FFT unit (170) separates a received symbol by Fourier conversion into a plurality of subcarriers, and a phase difference detection unit (193) detects a phase difference between 4 pilot carriers and data carriers adjacent to the pilot carriers (adjacent carriers) The decision unit (194) decides whether the phase differences between the pilot carriers and the adjacent carriers detected by the phase difference detection unit (193) fulfill a phase difference condition. Then, the decision unit (194) decides that the received symbol is an HTSIG if the number of phase differences that fulfill the phase difference condition is greater than or equal to a predetermined number, and decides that the received symbol is either a SIG or a DATA if the number of phase differences that fulfill the phase difference condition is less than the predetermined number.
摘要翻译： FFT单元（170）通过傅里叶变换将接收到的符号分离成多个子载波，相位差检测单元（193）检测4个导频载波和与导频载波（相邻载波）相邻的数据载波之间的相位差。 单元（194）判定由相位差检测单元（193）检测的导频载波与相邻载波之间的相位差是否达到相位差条件。 然后，如果满足相位差条件的相位差的数量大于或等于预定数量，则判定单元（194）判定所接收的符号是HTSIG，并且确定接收的符号是SIG或 DATA，如果实现相位差条件的相位差数量小于预定数量。
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公开(公告)号：US07702027B2
公开(公告)日：2010-04-20
申请号：US10573044
申请日：2005-03-09
申请人： Naganori Shirakata , Yasuo Harada , Koichiro Tanaka , Tomohiro Kimura , Shuya Hosokawa , Yoshio Urabe
发明人： Naganori Shirakata , Yasuo Harada , Koichiro Tanaka , Tomohiro Kimura , Shuya Hosokawa , Yoshio Urabe
IPC分类号： H04B7/02
CPC分类号： H04L27/2657 , H04L25/0204 , H04L27/2613 , H04L27/2675
摘要： In a transfer apparatus to which MIMO-OFDM is applied, a data transmission method and a data reception method are provided in which, even when there are frequency errors varying among transfer paths, the precision of estimation of an inverse propagation coefficient function can be improved, thereby making it possible to suppress a degradation in characteristics. Among symbols composed of a plurality of subcarriers orthognal to each other, the transfer apparatus uses, as a synchronization symbol, a symbol in which predetermined amplitudes and phases are assigned to a plurality of subcarriers spaced at predetermined frequency intervals. The synchronization symbol is divided into transmission antennas to generate a plurality of synchronization subsymbols, which are in turn simultaneously transmitted from a plurality of transmission antennas. A reception apparatus estimates a frequency error for each transfer path based on synchronization subsymbols included in signals received by a plurality of reception antennas, and based on the estimated frequency errors, corrects the received signals.
摘要翻译： 在应用MIMO-OFDM的传送装置中，提供数据传输方法和数据接收方法，其中即使在传输路径之间存在频率误差变化的情况下，也可以提高反向传播系数函数的估计精度 ，从而可以抑制特性的劣化。 在由彼此正交的多个子载波组成的符号之中，传送装置使用将预定的幅度和相位分配给以预定频率间隔隔开的多个子载波的符号作为同步符号。 同步符号被分成发送天线以产生多个同步子符号，这些同步子符号又从多个发送天线同时发送。 接收装置基于由多个接收天线接收的信号中包含的同步子符号估计每个传送路径的频率误差，并且基于估计的频率误差来校正接收到的信号。
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公开(公告)号：US08179782B2
公开(公告)日：2012-05-15
申请号：US12376157
申请日：2008-02-01
IPC分类号： H04J11/00
CPC分类号： H04L25/0228 , H04L25/06 , H04L27/2647
摘要： An FFT unit (170) separates a received symbol by Fourier conversion into a plurality of subcarriers, and a phase difference detection unit (193) detects a phase difference between 4 pilot carriers and data carriers adjacent to the pilot carriers (adjacent carriers) The decision unit (194) decides whether the phase differences between the pilot carriers and the adjacent carriers detected by the phase difference detection unit (193) fulfill a phase difference condition. Then, the decision unit (194) decides that the received symbol is an HTSIG if the number of phase differences that fulfill the phase difference condition is greater than or equal to a predetermined number, and decides that the received symbol is either a SIG or a DATA if the number of phase differences that fulfill the phase difference condition is less than the predetermined number.
摘要翻译： FFT单元（170）通过傅里叶变换将接收到的符号分离成多个子载波，相位差检测单元（193）检测4个导频载波和与导频载波（相邻载波）相邻的数据载波之间的相位差。 单元（194）判定由相位差检测单元（193）检测的导频载波与相邻载波之间的相位差是否达到相位差条件。 然后，如果满足相位差条件的相位差的数量大于或等于预定数量，则判定单元（194）判定所接收的符号是HTSIG，并且确定接收的符号是SIG或 DATA，如果实现相位差条件的相位差数量小于预定数量。
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公开(公告)号：US20100128826A1
公开(公告)日：2010-05-27
申请号：US12597571
申请日：2008-03-10
IPC分类号： H04L27/08
CPC分类号： H03G3/3052 , H03G3/3068
摘要： An AGC unit 111 starts a gain control of the variable gain amplifying unit 102 when a bit saturation occurs in the digital baseband signal output from the A/D converting unit 104, and starts a gain control of the variable gain amplifying unit 102 when a detection of STS from the digital baseband signal output from the A/D converting unit 104 is started. The AGC unit 111 performs the gain control of the variable gain amplifying unit 102 once when the detection of STS is started, and performs the gain control of the variable gain amplifying unit 102 twice when the bit saturation occurs, namely a larger number of times than when the detection of STS is started.
摘要翻译： 当从A / D转换单元104输出的数字基带信号中产生位饱和时，AGC单元111启动可变增益放大单元102的增益控制，并且当检测到可变增益放大单元102时，开始可变增益放大单元102的增益控制 开始从A / D转换单元104输出的数字基带信号的STS。 AGC单元111在STS的检测开始时一次执行可变增益放大单元102的增益控制，并且当发生比特饱和时，可变增益放大单元102进行两次增益控制，即更大次数 当STS的检测开始时。
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公开(公告)号：US20060221808A1
公开(公告)日：2006-10-05
申请号：US11395153
申请日：2006-04-03
IPC分类号： H04J11/00
CPC分类号： H04B7/0848 , H04L1/0048 , H04L1/06 , H04L5/026 , H04L25/03159 , H04L27/2657 , H04L27/2675 , H04L2025/03414 , H04L2025/03426 , H04L2027/003 , H04L2027/0048 , H04L2027/0067 , H04L2027/0087
摘要： OFDM signals each including a plurality of subcarriers (including data carriers and pilot carriers) orthogonal to each other are received by a plurality of receiver antennas. The received OFDM signals are each OFDM-demodulated into a plurality of receive subcarriers. Based on the plurality of receive subcarriers, the propagation coefficients of a plurality of space paths are estimated. An inverse matrix of a propagation matrix whose elements are the estimated propagation coefficients is calculated. Interference cancellation is performed for the plurality of receive subcarriers by using the inverse matrix, and transmit subcarriers multiplexed in space are estimated. A reliability of the inverse matrix is calculated. A pilot carrier is extracted from the estimated transmit subcarriers, and the extracted pilot carrier is weighted according to the reliability. An error included in the plurality of receive subcarriers is corrected based on the weighted pilot carrier.
摘要翻译： 每个包括彼此正交的多个子载波（包括数据载波和导频载波）的OFDM信号由多个接收机天线接收。 所接收的OFDM信号被OFDM解调成多个接收子载波。 基于多个接收子载波，估计多个空间路径的传播系数。 计算其元素是估计传播系数的传播矩阵的逆矩阵。 通过使用逆矩阵对多个接收子载波执行干扰消除，并且估计在空间中复用的发送子载波。 计算逆矩阵的可靠性。 从估计的发射子载波中提取导频载波，并根据可靠性对所提取的导频载波进行加权。 基于加权导频载波来校正包含在多个接收子载波中的误差。
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16.发明授权OFDM receiving method of OFDM receiver for receiving an OFDM signal via a plurality of space paths 有权OFDM接收机的OFDM接收方法，用于经由多个空间路径接收OFDM信号公开(公告)号：US07558223B2
公开(公告)日：2009-07-07
申请号：US11395153
申请日：2006-04-03
CPC分类号： H04B7/0848 , H04L1/0048 , H04L1/06 , H04L5/026 , H04L25/03159 , H04L27/2657 , H04L27/2675 , H04L2025/03414 , H04L2025/03426 , H04L2027/003 , H04L2027/0048 , H04L2027/0067 , H04L2027/0087
摘要： OFDM signals each including a plurality of subcarriers (including data carriers and pilot carriers) orthogonal to each other are received by a plurality of receiver antennas. The received OFDM signals are each OFDM-demodulated into a plurality of receive subcarriers. Based on the plurality of receive subcarriers, the propagation coefficients of a plurality of space paths are estimated. An inverse matrix of a propagation matrix whose elements are the estimated propagation coefficients is calculated. Interference cancellation is performed for the plurality of receive subcarriers by using the inverse matrix, and transmit subcarriers multiplexed in space are estimated. A reliability of the inverse matrix is calculated. A pilot carrier is extracted from the estimated transmit subcarriers, and the extracted pilot carrier is weighted according to the reliability. An error included in the plurality of receive subcarriers is corrected based on the weighted pilot carrier.
摘要翻译： 每个包括彼此正交的多个子载波（包括数据载波和导频载波）的OFDM信号由多个接收机天线接收。 所接收的OFDM信号被OFDM解调成多个接收子载波。 基于多个接收子载波，估计多个空间路径的传播系数。 计算其元素是估计传播系数的传播矩阵的逆矩阵。 通过使用逆矩阵对多个接收子载波执行干扰消除，并且估计在空间中复用的发送子载波。 计算逆矩阵的可靠性。 从估计的发射子载波中提取导频载波，并根据可靠性对所提取的导频载波进行加权。 基于加权导频载波来校正包含在多个接收子载波中的误差。
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公开(公告)号：US20070259623A1
公开(公告)日：2007-11-08
申请号：US11628039
申请日：2005-06-03
CPC分类号： H04B7/0854 , H04B17/345
摘要： A radio communication device that, even if it is interfered by a radio transmission station other than a radio transmission station with which it intends to communicate, estimates a signal transmitted from the intended radio transmission station by taking into account the influence of the interference, by obtaining an estimator of “s” that denotes a column vector representing a signal transmitted from the radio transmission station, in accordance with a following expression: s=RssHH(HRssHH+Ruu)−1r, where “Rss” denotes a covariance matrix of the column vector “s”, “r” denotes a column vector representing the signal received by the signal receiving unit, “H” denotes a matrix being the numerical sequence calculated by the first calculating unit, “Ruu” denotes a covariance matrix being the numerical sequence calculated by the second calculating unit, “H” denotes a complex conjugate transposition, and “−1” denotes an inverse matrix.
摘要翻译： 一种无线电通信装置，即使是由与其打算进行通信的无线电发送站以外的无线电发送站的干扰，也可以通过考虑干扰的影响来估计从预期的无线电发送站发送的信号，由 根据以下表达式获得表示表示从无线电发送站发送的信号的列向量的“s”的估计器：s = RssH H（H s H H H H + Ruu） -1，其中“Rss”表示列向量“s”的协方差矩阵，“r”表示表示由信号接收单元接收的信号的列向量“H” 表示由第一计算单元计算的数字序列的矩阵，“Ruu”表示由第二计算单元计算的数字序列的协方差矩阵，“H”表示复共轭转置，“ -1 “表示逆矩阵。
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公开(公告)号：US06993083B1
公开(公告)日：2006-01-31
申请号：US09597764
申请日：2000-06-20
申请人： Naganori Shirakata , Tomohiro Kimura , Koichiro Tanaka , Hideki Nakahara , Yasuo Harada , Shuya Hosokawa
发明人： Naganori Shirakata , Tomohiro Kimura , Koichiro Tanaka , Hideki Nakahara , Yasuo Harada , Shuya Hosokawa
IPC分类号： H04L7/04
CPC分类号： H04L27/2665 , H04L27/2662
摘要： An apparatus and method for OFDM demodulation establish symbol synchronization to minimize between-symbol interference even under an environment where multipath occurs.An incoming signal is an OFDM signal including a transmission symbol structured by a valid symbol period and a guard interval, and a predetermined synchronization symbol is included in the OFDM signal for every transmission frame. A correlator calculates how a signal generated by a synchronization symbol generator and the OFDM signal are correlated. A correlation calculator then calculates a correlation therefrom. An integrator integrates the calculated correlation by the guard interval. A timing determination device determines symbol timing from the integrated correlation. An FFT window generator outputs operation timing for Fourier transform from the determined symbol timing. Based on the signal outputted from the FFT window generator, the apparatus for OFDM demodulation extracts a signal in the valid symbol period from the transmission symbol for demodulation.
摘要翻译： 即使在发生多路径的环境下，用于OFDM解调的装置和方法建立符号同步以最小化符号间干扰。 输入信号是包括由有效符号周期和保护间隔构成的发送符号的OFDM信号，并且对于每个发送帧，在OFDM信号中包括预定的同步符号。 相关器计算由同步符号发生器和OFDM信号产生的信号的相关性。 然后，相关计算器从其计算相关性。 积分器将计算的相关性与保护间隔进行积分。 定时确定装置从综合相关确定符号定时。 FFT窗口生成器从所确定的符号定时输出用于傅里叶变换的操作定时。 基于从FFT窗口生成器输出的信号，OFDM解调装置从用于解调的发送符号中提取有效符号周期中的信号。
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公开(公告)号：US07899401B2
公开(公告)日：2011-03-01
申请号：US11628039
申请日：2005-06-03
CPC分类号： H04B7/0854 , H04B17/345
摘要： A radio communication device that, even if it is interfered by a radio transmission station other than a radio transmission station with which it intends to communicate, estimates a signal transmitted from the intended radio transmission station by taking into account the influence of the interference, by obtaining an estimator of “s” that denotes a column vector representing a signal transmitted from the radio transmission station, in accordance with a following expression: s=RssHH(HRssHH+Ruu)−1r, where “Rss” denotes a covariance matrix of the column vector “s”, “r” denotes a column vector representing the signal received by the signal receiving unit, “H” denotes a matrix being the numerical sequence calculated by the first calculating unit, “Ruu” denotes a covariance matrix being the numerical sequence calculated by the second calculating unit, “H” denotes a complex conjugate transposition, and “−1” denotes an inverse matrix.
摘要翻译： 一种无线电通信装置，即使是由与其打算进行通信的无线电发送站以外的无线电发送站的干扰，也可以通过考虑干扰的影响来估计从预期的无线电发送站发送的信号，由 根据以下表达式获得表示从无线电发送站发送的信号的列向量的“s”的估计器：s = RssHH（HRssHH + Ruu）-1r，其中“Rss”表示 列向量“s”，“r”表示表示由信号接收单元接收的信号的列向量，“H”表示由第一计算单元计算的数字序列的矩阵，“Ruu”表示协方差矩阵， 序列由第二计算单元计算，“H”表示复共轭转置，“-1”表示逆矩阵。
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20.发明申请公开(公告)号：US20060025090A1
公开(公告)日：2006-02-02
申请号：US10533207
申请日：2004-10-12
CPC分类号： H04B7/0808
摘要： During all or part of a time period during which pattern signals are received, a diversity receiving apparatus allows a gain control section to fix the gain of a gain amplifier section, allows an antenna switching section to sequentially switch the selection of antennas during antenna switching periods which are synchronized with averaging periods, and determines an antenna to receive data contained in a packet, based on the levels of average powers measured by an averaging section on an averaging period-by-averaging period basis.
摘要翻译： 在接收图案信号的时间段的全部或部分期间，分集接收装置允许增益控制部分固定增益放大器部分的增益，允许天线切换部分在天线切换周期期间顺序切换天线的选择 并且根据平均化周期平均化周期的平均值测量的平均功率的电平，确定用于接收分组中包含的数据的天线。
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