公开(公告)号：WO2005069836A2

公开(公告)日：2005-08-04

申请号：PCT/US2005001133

申请日：2005-01-13

Applicant: INTERDIGITAL TECH CORP ,  CHITRAPU PRABHAKAR R ,  KAEWELL JOHN DAVID JR ,  HERSCHAFT RICHARD DAN ,  HOFFMANN JOHN ERICH ,  OLESEN ROBERT LIND ,  SHIN SUNG-HYUK

Inventor： CHITRAPU PRABHAKAR R ,  KAEWELL JOHN DAVID JR ,  HERSCHAFT RICHARD DAN ,  HOFFMANN JOHN ERICH ,  OLESEN ROBERT LIND ,  SHIN SUNG-HYUK

IPC: H04B7/216 ,  H04B7/26 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/18 ,  H04W12/06

CPC classification number: H04B7/2628 ,  H04L1/0041 ,  H04L1/0061 ,  H04L1/0065 ,  H04L1/0606 ,  H04L1/0618 ,  H04L1/08 ,  H04L1/1812 ,  H04W12/06

Abstract: A method and apparatus for protecting and authenticating wirelessly transmitted digital information using numerous techniques. The apparatus may be a wireless orthogonal frequency division multiplexing (OFDM) communication system, a base station, a wireless transmit/receive unit (WTRU), a transmitter, a receiver and/or an integrated circuit (IC). The wireless OFDM communication system includes a transmitter which steganographically embeds digital information in an OFDM communication signal and wirelessly transmits the OFDM communication signal. The system further includes a receiver which receives the OFDM communication signal and extracts the steganographically embedded digital information from the received OFDM communication signal.

Abstract translation: 一种使用许多技术来保护和认证无线传输的数字信息的方法和装置。 该装置可以是无线正交频分复用（OFDM）通信系统，基站，无线发射/接收单元（WTRU），发射机，接收机和/或集成电路（IC）。 无线OFDM通信系统包括在OFDM通信信号中隐写地嵌入数字信息并无线地发送OFDM通信信号的发射机。 该系统还包括接收OFDM通信信号并从接收的OFDM通信信号中提取隐写的嵌入式数字信息的接收机。

公开(公告)号：WO2007103183A3

公开(公告)日：2007-11-15

申请号：PCT/US2007005374

申请日：2007-02-28

Applicant: INTERDIGITAL TECH CORP ,  KOO CHANG-SOO ,  ZEIRA ELDAD ,  LU I-TAI ,  OLESEN ROBERT LIND ,  TSAI KUNJU

Inventor： KOO CHANG-SOO ,  ZEIRA ELDAD ,  LU I-TAI ,  OLESEN ROBERT LIND ,  TSAI KUNJU

IPC: H04L25/02

CPC classification number: H04L25/0216 ,  H04L25/0208 ,  H04L25/0212 ,  H04L25/0214 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2647

Abstract: In an orthogonal frequency division multiplexing (OFDM) system, a frequency domain channel estimate for non-nullified subcarriers is converted to a time domain channel estimate. The number of taps L of a channel model is determined based on the time domain channel estimate. An improved time domain channel estimate is obtained by computing L tap coefficients of the channel model from the frequency domain channel estimate. An improved frequency domain channel estimate is obtained by performing a Fourier transform on the improved time domain channel estimate. Alternatively, a time domain truncation method may be performed selectively only if the signal-to-noise ratio (SNR) is below a threshold. Alternatively, a frequency domain channel estimate for pilot subcarriers are converted to a time domain channel estimate and an improved frequency domain channel estimate is obtained based on the number of pilot subcarriers and a delay spread.

Abstract translation: 在正交频分复用（OFDM）系统中，用于非无效副载波的频域信道估计被转换为时域信道估计。 基于时域信道估计来确定信道模型的抽头数量L. 通过根据频域信道估计来计算信道模型的L个抽头系数来获得改进的时域信道估计。 通过对改进的时域信道估计执行傅里叶变换来获得改进的频域信道估计。 或者，只有当信噪比（SNR）低于阈值时才可以选择性地执行时域截断方法。 或者，导频子载波的频域信道估计被转换为时域信道估计，并且基于导频子载波的数量和延迟扩展来获得改进的频域信道估计。

公开(公告)号：WO2007019171A3

公开(公告)日：2007-06-21

申请号：PCT/US2006030079

申请日：2006-08-02

Applicant: INTERDIGITAL TECH CORP ,  KOO CHANG-SOO ,  LU I-TAI ,  DAI QINGYUAN ,  VOLTZ PETER J ,  OLESEN ROBERT LIND

Inventor： KOO CHANG-SOO ,  LU I-TAI ,  DAI QINGYUAN ,  VOLTZ PETER J ,  OLESEN ROBERT LIND

IPC: H04B17/00

CPC classification number: H04L27/2613 ,  H04B17/336

Abstract: In a wireless communication system, a method and apparatus for noise estimation of a received OFDM communication signal, wherein the signal comprises a data frame with a preamble having at least one long training field (LTF) containing two identical OFDM symbols comprise examining the LTF for identical OFDM symbols. The noise power in the signal is estimated and the received signal power is measured. The signal to noise ratio is calculated and the signal power is determined by subtracting the noise power from the signal noise.

Abstract translation: 在无线通信系统中，用于接收的OFDM通信信号的噪声估计的方法和装置，其中所述信号包括具有前导码的数据帧，所述前同步码具有至少一个包含两个相同的OFDM符号的长训练场（LTF），包括检查所述LTF用于 相同的OFDM符号。 估计信号中的噪声功率并测量接收信号功率。 计算信噪比，通过从信号噪声中减去噪声功率来确定信号功率。

公开(公告)号：WO2006020339A3

公开(公告)日：2006-05-04

申请号：PCT/US2005025926

申请日：2005-07-21

Applicant: INTERDIGITAL TECH CORP ,  KOO CHANG-SOO ,  OLESEN ROBERT LIND

Inventor： KOO CHANG-SOO ,  OLESEN ROBERT LIND

IPC: H04J99/00 ,  H04B7/216

CPC classification number: H04B7/0417 ,  H04B17/336 ,  H04L1/0002 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0064 ,  H04L27/2601 ,  Y02D50/10

Abstract: A method and apparatus for optimizing the system capacity of an Orthogonal Frequency Division Multiplexing (OFDM) system that uses with Multiple-Input Multiple-Output (MIMO) antennas. In a receiver, a target quality of service (QoS) metric and reference data rate are set. The target QoS metric may be set to a predetermined value and/or may be adjusted dynamically with respect to packet error rate (PER) by a slow outer-loop control processor. The QoS of received signals are measured and compared to the target QoS. Depending on the comparison, the receiver generates a channel quality indicator (CQI) which is sent back to the transmitting transmitter. The CQI is a one or two bit indicator which indicates to the transmitter to disable, adjust or maintain data transmission rates of particular sub-carriers, groups of sub-carriers per transmit antenna, or groups of sub-carriers across all transmit antennas. At the transmitter, the transmitted data rate is disabled, adjusted or maintained. At the receiver, the target QoS metric and reference data rate are adjusted accordingly. This process is repeated for each data frame of each sub-carrier group.

Abstract translation: 一种用于优化使用多输入多输出（MIMO）天线的正交频分复用（OFDM）系统的系统容量的方法和装置。 在接收机中，设置目标服务质量（QoS）度量和参考数据速率。 可以将目标QoS度量设置为预定值和/或可以通过慢速外部环路控制处理器相对于分组错误率（PER）动态地调整。 测量接收信号的QoS并将其与目标QoS进行比较。 根据比较，接收机产生发送回发送发射机的信道质量指示符（CQI）。 CQI是一个或两个比特指示符，其向发射机指示禁用，调整或维持特定子载波，每个发射天线的子载波组或跨所有发射天线的子载波组的数据传输速率。 在发射机处，传输的数据速率被禁用，调整或维护。 在接收机处，相应地调整目标QoS度量和参考数据速率。 对每个子载波组的每个数据帧重复该过程。

公开(公告)号：WO2006031540A2

公开(公告)日：2006-03-23

申请号：PCT/US2005031784

申请日：2005-09-08

Applicant: INTERDIGITAL TECH CORP ,  HUANG YUEJIN ,  OLESEN ROBERT LIND ,  KOO CHANG-SOO

Inventor： HUANG YUEJIN ,  OLESEN ROBERT LIND ,  KOO CHANG-SOO

IPC: H04K1/10

CPC classification number: H04L27/262 ,  H04B7/02 ,  H04B7/0684 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/0226 ,  H04L27/261 ,  H04L27/2614

Abstract: The present invention is related to a method and system for optimization of channel estimation and synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input Multiple-Output (MIMO) wireless communication system. In accordance with the present invention, all of the training sequences are simply constructed based on a basic code by cyclically shifting the basic code. The training sequences are transmitted from different antennas in parallel without performing inverse fast Fourier transform. As a result, there is no peak-to-average ratio problem. Channel estimation is performed in each receiver based on the samples before fast Fourier transform and the maximum-likelihood estimate of channel response in time domain is then mapped into the frequency domain. The channel estimation is not only very simple in implementation, but also very efficient in computation.

Abstract translation: 本发明涉及一种用于在正交频分复用（OFDM）多输入多输出（MIMO）无线通信系统中优化信道估计和同步的方法和系统。 根据本发明，通过循环移位基本代码，基于基本代码简单地构建所有的训练序列。 训练序列并行地从不同的天线发射，而不进行快速傅立叶逆变换。 因此，没有峰均比例问题。 基于快速傅立叶变换之前的样本在每个接收机中执行信道估计，然后将时域中的信道响应的最大似然估计值映射到频域。 信道估计不仅在实现上非常简单，而且在计算上也非常有效。

公开(公告)号：WO2007030308A2

公开(公告)日：2007-03-15

申请号：PCT/US2006032643

申请日：2006-08-22

Applicant: INTERDIGITAL TECH CORP ,  DAI QINGYUAN ,  OLESEN ROBERT LIND ,  KOO CHANG-SOO ,  SHAH NIRAV

Inventor： DAI QINGYUAN ,  OLESEN ROBERT LIND ,  KOO CHANG-SOO ,  SHAH NIRAV

IPC: H04L5/12

CPC classification number: H04L27/3809 ,  H04L25/067

Abstract: A method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation (QAM) are disclosed. A transmitting wireless transmit/receive unit (WTRU) maps N input bits to one of 2N symbols in a 2N-QAM constellation. A receiving WTRU receives a signal and generates a sample of the received signal. A soft bit value of the most significant bit (MSB) is calculated based on a value of the sample. A magnitude of the soft bit value of the MSB is subtracted from a threshold. The threshold is initially set with respect to the QAM order, N. A soft bit value of the next MSB is calculated based on the subtraction results. The calculation and subtraction steps are repeated for the next MSB until soft bit values of all the remaining bits are obtained while diving the threshold by 2 each iteration.

Abstract translation: 公开了一种用于解映射由高阶正交幅度调制（QAM）调制的符号的方法和装置。 发射无线发射/接收单元（WTRU）将N个输入比特映射到2N-QAM星座中的2N个符号之一。 接收WTRU接收信号并产生接收信号的采样。 基于样本的值计算最高有效位（MSB）的软比特值。 从阈值中减去MSB的软比特值的大小。 阈值初始设置为相对于QAM顺序，N根据减法结果计算下一个MSB的软比特值。 对于下一个MSB重复计算和减法步骤，直到获得所有剩余比特的软比特值，同时将阈值每次迭代2次。

公开(公告)号：WO2006055241A3

公开(公告)日：2007-02-22

申请号：PCT/US2005039525

申请日：2005-11-01

Applicant: INTERDIGITAL TECH CORP ,  KWAK JAEYOUNG ,  KOO CHANG-SOO ,  OLESEN ROBERT LIND ,  BULTAN AYKUT ,  OZLUTURK FATIH

Inventor： KWAK JAEYOUNG ,  KOO CHANG-SOO ,  OLESEN ROBERT LIND ,  BULTAN AYKUT ,  OZLUTURK FATIH

IPC: H04J99/00 ,  H04K1/10 ,  H04B7/02 ,  H04L1/02 ,  H04L27/00

CPC classification number: H04L1/0606 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0697 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/04 ,  H04L5/0007 ,  H04L25/0248 ,  H04L27/2601 ,  H04L27/2626 ,  H04L27/2647

Abstract: A method and apparatus for combining space-frequency block coding (SFBC), spatial multiplexing (SM) and beamforming in a multiple-input multiple-output (MIMO) orthogonal frequency division mutliplexing (OFDM) system. The system inlcudes a transmitter (110) with a plurality of transmit antennas (126) and a receiver (130) with a plurality of receive antennas (128). The transmitter generates generates at least one data stream and plurality of spatial streams (118). The number of generated spatial streams is based on the number of the transmit antennas and the number of the receive antennas. The transmitter determines a transmission scheme in accordance with at least one of SFBC (112), SM (114), and beam forming (122). The transmitter transmits data in the data stream to the receiver based on the selected transmission scheme.

Abstract translation: 一种用于在多输入多输出（MIMO）正交频分复用（OFDM）系统中组合空间频率块编码（SFBC），空间复用（SM）和波束成形的方法和装置。 该系统包括具有多个发射天线（126）的发射机（110）和具有多个接收天线（128）的接收机（130）。 发射器产生产生至少一个数据流和多个空间流（118）。 所生成的空间流的数量基于发射天线的数量和接收天线的数量。 发射机根据SFBC（112），SM（114）和波束成形（122）中的至少一个确定传输方案。 发射机根据所选择的传输方案向接收机发送数据流中的数据。

公开(公告)号：WO2006138032A2

公开(公告)日：2006-12-28

申请号：PCT/US2006020170

申请日：2006-05-24

Applicant: INTERDIGITAL TECH CORP ,  PAN JUNG-LIN ,  OLESEN ROBERT LIND ,  TSAI YINGMING

Inventor： PAN JUNG-LIN ,  OLESEN ROBERT LIND ,  TSAI YINGMING

IPC: H04B1/04 ,  H01Q11/12

CPC classification number: H01Q1/2216 ,  H01Q21/28 ,  H04B7/0417 ,  H04B7/0623 ,  H04B7/063 ,  H04W52/248 ,  H04W52/42

Abstract: The present invention is related to a method and system for transmit power control in a multiple-input multiple-output (MIMO) wireless communication system. Both a transmitter and a receiver comprise multiple antennae for transmission and reception. The transmitter comprises a power allocation unit for controlling transmit power based on a feedback received from the receiver. The receiver comprises a channel estimator and a singular value decomposition (SVD) unit. The channel estimator generates a channel matrix from a signal received from the transmitter and the SVD unit decomposes the channel matrix into D, U and V matrices. The receiver sends a feedback generated based on output from the SVD unit to the transmitter for controlling the transmit power. The feedback may be one of an eigenvalue, a transmit power level or a power control bit or command. A hybrid scheme for selecting one of them based on channel condition may be implemented.

Abstract translation: 本发明涉及一种用于多输入多输出（MIMO）无线通信系统中的发射功率控制的方法和系统。 发射机和接收机都包括用于传输和接收的多个天线。 发射机包括功率分配单元，用于基于从接收机接收的反馈来控制发射功率。 接收机包括信道估计器和奇异值分解（SVD）单元。 信道估计器从从发射机接收的信号中生成信道矩阵，并且SVD单元将信道矩阵分解为D，U和V矩阵。 接收机将基于SVD单元的输出产生的反馈发送到发射机以控制发射功率。 反馈可以是特征值，发射功率电平或功率控制位或命令之一。 可以实现用于基于信道条件选择其中的一个的混合方案。

公开(公告)号：WO2004047461A3

公开(公告)日：2004-08-12

申请号：PCT/US0336851

申请日：2003-11-17

Applicant: INTERDIGITAL TECH CORP

Inventor： STERNBERG GREGORY S ,  YANG RUI ,  PIETRASKI PHILIP J ,  OLESEN ROBERT LIND

IPC: H03M13/35 ,  H04L1/00 ,  H04L1/18 ,  H04L1/20 ,  H03M13/45

CPC classification number: H04L25/067 ,  H03M13/35 ,  H04L1/0045 ,  H04L1/0071 ,  H04L1/1812 ,  H04L1/20 ,  H04L25/0222

Abstract: A system, components and methods provide FEC decoding in a wireless communication system in which signal to noise ratio estimation is used for scaling (18) information captured by a demodulator (14) in processing received wireless communication signals (12). A preferred wireless transmit unit (WRTU) has a channel rate estimation device (23) configured to process the received communication signals for the particular communication channel and to produce channel change rate estimates. A signal to noise ratio (SNR) estimation device (16) of the WRTU is configured to produce SNR estimates based on observation windows of a calculated number of samples of the received signal where the number of samples used for each observation window is calculated (25) as a function of the channel change rate estimates produced by the channel rate estimation device (23).

Abstract translation: 系统，组件和方法在无线通信系统中提供FEC解码，其中在处理接收的无线通信信号（12）中使用信噪比估计来缩放由解调器（14）捕获的信息。 优选的无线发射单元（WRTU）具有信道速率估计装置（23），其被配置为处理用于特定通信信道的所接收的通信信号并产生信道变化率估计。 WRTU的信噪比（SNR）估计装置（16）被配置为基于计算出的每个观察窗口使用的样本数的计算的接收信号的样本数的观测窗口来产生SNR估计（25 ）作为由信道速率估计装置（23）产生的信道变化率估计的函数。

公开(公告)号：WO2007142835A3

公开(公告)日：2008-05-29

申请号：PCT/US2007012278

申请日：2007-05-23

Applicant: INTERDIGITAL TECH CORP ,  LI YINGXUE ,  OLESEN ROBERT LIND

Inventor： LI YINGXUE ,  OLESEN ROBERT LIND

IPC: H04B7/08 ,  H04L25/03 ,  H04L25/06

CPC classification number: H04B7/0413 ,  H04L1/20 ,  H04L25/0204 ,  H04L25/0242 ,  H04L25/0256 ,  H04L25/067 ,  H04L2025/03414 ,  H04L2025/0342 ,  H04L2025/03426

Abstract: A multiple-input multiple-output (MIMO) receiver includes a MIMO decoder, a pre-scaling unit, a demapper, and a post-scaling unit. The MIMO decoder performs a MIMO decoding on received signals to decouple a plurality of symbols transmitted via a plurality of data streams. Both pre-demapping scaling and post-demapping scaling are performed to improve the performance of the receiver. A pre-scaling coefficient is applied to the symbols by the pre-scaling unit to generate pre-scaled symbols. The pre-scaled symbols are converted to soft bits by the demapper. The post-scaling unit then applies a post-scaling coefficient to the soft bits. The post-scaling coefficient is a signal-to-interference and noise ratio (SINR). Cross interference is taken into account in post-demapping scaling to obtain more accurate soft bits for subsequent decoding. The present invention is applicable to both a multi-carrier system, (such as orthogonal frequency division multiplexing (OFDM)), and a single carrier system.

Abstract translation: 多输入多输出（MIMO）接收机包括MIMO解码器，预缩放单元，解映射器和后定标单元。 MIMO解码器对接收到的信号执行MIMO解码以去耦经由多个数据流发送的多个符号。 执行预映射缩放和后解映射缩放以提高接收机的性能。 通过预缩放单元将预缩放系数应用于符号以生成预缩放符号。 预分解符号由解映射器转换为软位。 然后，缩放后单元将比例缩放系数应用于软比特。 后缩放系数是信噪比（SINR）。 在后解映射缩放中考虑到交叉干扰，以获得更准确的软比特用于后续解码。 本发明适用于多载波系统（例如正交频分复用（OFDM））和单载波系统。