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91. 发明授权

US07961123B2 Time-interleaved analog-to-digital converter 有权
标题翻译：时间交织的模数转换器
公开(公告)号：US07961123B2
公开(公告)日：2011-06-14
申请号：US12575337
申请日：2009-10-07
申请人： Viswanathan Nagarajan , Sriram Murali , Sthanunathan Ramakrishnan , Visvesvaraya Pentakota , Jaiganesh Balakrishnan
发明人： Viswanathan Nagarajan , Sriram Murali , Sthanunathan Ramakrishnan , Visvesvaraya Pentakota , Jaiganesh Balakrishnan
IPC分类号： H03M1/06
CPC分类号： H03M1/1057 , H03M1/0836 , H03M1/1215
摘要： A time-interleaved (TI) analog-to-digital converter (ADC) is provided. The TI ADC generally comprises a clock generator, two or more ADCs, adjustable delay elements, and an estimator. The clock generator generates clock signals. Each ADC is associated with at least one of the clock signals so as to sample an input signal that is generally wide-sense stationary at sampling instants, where correlation function exist between samples from a two or more of the ADCs that is a function of the time differences between associated sampling instants. The estimator is coupled to each of the adjustable delay elements and each of the ADCs so as to calculate the correlation function and adjust the adjustable delay elements to account for sampling mismatch between the ADCs based at least in part on the correlation function.
摘要翻译：提供了时间交织（TI）模数转换器（ADC）。 TI ADC通常包括时钟发生器，两个或更多个ADC，可调延迟元件和估计器。时钟发生器产生时钟信号。每个ADC与至少一个时钟信号相关联，以便在采样时刻对通常为宽静态的输入信号进行采样，其中相关函数存在于两个或更多个ADC之间的样本之间，该两个或更多个ADC是相关抽样时间之间的时间差异。估计器耦合到每个可调节延迟元件和每个ADC，以便计算相关函数，并且至少部分地基于相关函数来调整可调延迟元件以考虑ADC之间的采样失配。

92. 发明申请

US20110064029A1 DOWNLINK SIGNALING FOR A MULTI-CARRIER COMMUNICATIONS SYSTEM 有权
标题翻译：多载波通信系统的下行信令
公开(公告)号：US20110064029A1
公开(公告)日：2011-03-17
申请号：US12949442
申请日：2010-11-18
申请人： Timothy M. Schmidl , Eko N. Onggosanusi , Anand G. Dabak , Aris Papasakellariou , Jaiganesh Balakrishnan , Yan Hui
发明人： Timothy M. Schmidl , Eko N. Onggosanusi , Anand G. Dabak , Aris Papasakellariou , Jaiganesh Balakrishnan , Yan Hui
IPC分类号： H04W88/02
CPC分类号： H04L1/1845 , H04L1/0026 , H04L1/1671
摘要： System and method for signaling control information in a multi-carrier communications system to transmit data. A preferred embodiment comprises demodulating a first carrier that is used for transmitting a control channel transmission, determining a second carrier that is used for transmitting a data channel transmission based upon the demodulated control channel transmission, and demodulating the second carrier to obtain the data channel transmission. Additionally, designs for multi-carrier receivers are provided.
摘要翻译：用于在多载波通信系统中用于信令控制信息的数据传输的系统和方法。优选实施例包括解调用于发送控制信道传输的第一载波，基于解调的控制信道传输确定用于发送数据信道传输的第二载波，以及解调第二载波以获得数据信道传输。另外，提供了多载波接收机的设计。

93. 发明申请

US20110058626A1 Ultra Wideband Interference Cancellation for Orthogonal Frequency Division Multiplex Transmitters by Protection-Edge Tones 有权
标题翻译：通过保护边缘音调正交频分复用发射机的超宽带干扰消除
公开(公告)号：US20110058626A1
公开(公告)日：2011-03-10
申请号：US12636917
申请日：2009-12-14
申请人： Jaiganesh Balakrishnan , Hirohisa Yamaguchi
发明人： Jaiganesh Balakrishnan , Hirohisa Yamaguchi
IPC分类号： H04L25/49
CPC分类号： H04L27/2613 , H04B1/719 , H04L25/03828 , H04L27/2626
摘要： A transmitter and communication system are disclosed. A first component operable to determine an active interference cancellation value for each of a plurality of active interference cancellation tones and a protection-edge value for each of a plurality of protection-edge tones based on optimizing active interference cancellation, and further based on constraining an average power of the active interference cancellation values and the protection-edge values to less than or equal to a maximum power level, and on a plurality of data values. A second component is operable to transform a sequence of tones to a time domain signal, the sequence of tones comprised of the active interference cancellation tones, the protection-edge tones, and a plurality of data tones, the data tones containing the data values. A third component operable to transmit an orthogonal frequency division multiplex signal based on the time domain signal.
摘要翻译：公开了一种发射机和通信系统。第一组件，其可操作以基于优化主动干扰消除来确定多个有源干扰消除音调中的每一个的主动干扰消除值和针对多个保护边缘音调中的每一个的保护边缘值，并且还基于约束主动干扰消除值和保护边缘值的平均功率小于或等于最大功率电平，以及多个数据值。第二组件可操作以将音调序列变换为时域信号，由主动干扰消除音调组成的音调序列，保护边缘音调和多个数据音调，数据音调包含数据值。第三组件，用于基于时域信号发送正交频分复用信号。

94. 发明申请

US20110026616A1 METHOD AND APPARATUS FOR DOPPLER ESTIMATION IN ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING (OFDM) 有权
标题翻译：正交频分复用（OFDM）中多普勒估计的方法与装置
公开(公告)号：US20110026616A1
公开(公告)日：2011-02-03
申请号：US12512784
申请日：2009-07-30
申请人： Charles Sestok , Jaiganesh Balakrishnan
发明人： Charles Sestok , Jaiganesh Balakrishnan
IPC分类号： H04L27/28
CPC分类号： H04L27/2647 , H04L25/0204 , H04L25/0222 , H04L25/0228
摘要： A method and apparatus for estimating Doppler channel in an Orthogonal Frequency-Division Multiplexor. The method includes selecting a continuation pilot, generating a channel estimation, filtering the continual pilot with at least one channel estimator, computing the error between the channel estimation and the filtered channel estimates, averaging the error across continual pilot carriers and over time, estimating noise variance, corrects average error utilizing the estimated noise variance to generate an estimate of the overall channel estimator error, and setting the filter cutoff to minimum estimation error.
摘要翻译：用于估计正交频分多路复用器中的多普勒频道的方法和装置。该方法包括选择连续导频，产生信道估计，用至少一个信道估计器对连续导频进行滤波，计算信道估计与经滤波的信道估计之间的误差，对连续导频载波上的误差和时间进行平均，估计噪声使用估计的噪声方差校正平均误差，以产生总体信道估计误差的估计，并将滤波器截止值设置为最小估计误差。

95. 发明授权

US07796716B2 Eliminating narrowband interference in a receiver 有权
标题翻译：消除接收机中的窄带干扰
公开(公告)号：US07796716B2
公开(公告)日：2010-09-14
申请号：US11828349
申请日：2007-07-26
申请人： Bijoy Bhukania , Raghu Ganesan , Naga Saty Srikanth Puvvada , Sthanunathan Ramakrishnan , Jaiganesh Balakrishnan
发明人： Bijoy Bhukania , Raghu Ganesan , Naga Saty Srikanth Puvvada , Sthanunathan Ramakrishnan , Jaiganesh Balakrishnan
IPC分类号： H03D1/06 , H03K5/01 , H03K6/04 , H04B1/10 , H04L1/00 , H04L25/08
CPC分类号： H04L27/2647 , H04B1/71 , H04L25/03006
摘要： A wireless device receives an input signal representing a signal of interest (e.g., one or more portions of a packet) on a wireless medium. The input signal may, in addition, contain narrowband interference signals. The wireless device removes the signal of interest from the input signal to produce a residue signal, and analyzes the residue signal to determine the presence of any interference bands in which narrowband interference signals may be present. The wireless device then removes the detected interference bands from the input signal. The residue signal may reveal the presence of interference signals, which might otherwise be hard to distinguish in the input signal. Thus, interference signals with power levels much lower than the power of the signal of interest may be detected and removed.
摘要翻译：无线设备在无线介质上接收表示感兴趣的信号（例如，分组的一个或多个部分）的输入信号。此外，输入信号可以包含窄带干扰信号。无线设备从输入信号中去除感兴趣的信号以产生残余信号，并且分析残差信号以确定可能存在窄带干扰信号的任何干扰频带的存在。无线设备然后从输入信号中去除检测到的干扰带。残留信号可能显示干扰信号的存在，否则在输入信号中可能难以区分。因此，可以检测和去除具有远低于感兴趣信号的功率的功率水平的干扰信号。

96. 发明授权

US07724832B2 MIMO decoding 有权
标题翻译： MIMO解码
公开(公告)号：US07724832B2
公开(公告)日：2010-05-25
申请号：US10857417
申请日：2004-05-27
申请人： Srinath Hosur , Jaiganesh Balakrishnan , Michael Polley , Manish Goel , Muhammad Ikram
发明人： Srinath Hosur , Jaiganesh Balakrishnan , Michael Polley , Manish Goel , Muhammad Ikram
IPC分类号： H04K1/10
CPC分类号： H04L27/2647 , H04L25/0204 , H04L25/067
摘要： In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order. In a noisy environment, however, any incorrect decision made on a symbol in an iteration leaves its contribution in the updated received signal available for processing in the following iterations. Fortunately, if the level of interference is estimated and the soft bits are scaled appropriately by the estimated interference power, the performance of IMMSE receiver can be greatly improved. Preferred embodiments estimate the interference by computing the probability of error in decoding the symbols of the previous stage(s). The computation of decision error probability depends on the constellation size of transmitted symbols and introduces very little processing overhead.
摘要翻译：在采用LMMSE接收机的MIMO无线通信中，在存在由两个主要部分组成的干扰的接收机处估计通过发射天线发射的符号：一个由于加性噪声而导致的，另一个是由于通过剩余的天线。已经显示出妨碍通信系统的性能，导致不正确的符号决定，特别是在低SNR下。 IMMSE已被设计为解决这个问题的办法; 在IMMSE处理中，经由每个发送天线发送的符号被迭代地解码。在每个处理阶段，通过去除在先前迭代中检测到的符号的贡献来更新接收到的信号。原则上，这降低了嵌入期望符号的附加干扰。因此，干扰电平在处理顺序下降时单调减少。然而，在嘈杂的环境中，在迭代中对符号做出的任何不正确的决定使其在更新的接收信号中的贡献可用于在以下迭代中进行处理。幸运的是，如果估计干扰水平，并通过估计的干扰功率适当地缩放软比特，则可以大大提高IMMSE接收机的性能。优选实施例通过计算解码前一级的符号的误差概率来估计干扰。决策误差概率的计算取决于传输符号的星座大小，并引入很少的处理开销。

97. 发明申请

US20080227421A1 Reducing Power Consumption In Receivers Employing Conversion To Intermediate Frequency 有权
标题翻译：在使用转换为中频的接收机中降低功耗
公开(公告)号：US20080227421A1
公开(公告)日：2008-09-18
申请号：US12047345
申请日：2008-03-13
申请人： Jaiganesh Balakrishnan
发明人： Jaiganesh Balakrishnan
IPC分类号： H04B1/26 , H04B1/06
CPC分类号： H04B1/28 , H04B1/0039 , H04W52/0225 , Y02D70/00 , Y02D70/40
摘要： A receiver to recover a signal of interest while consuming reduced power in some scenarios. The receiver contains a in-phase channel processing path and a quadrature phase channeling path for down converting an input signal to an intermediate frequency, and then recovering the signal of interest by further processing of the input signal at intermediate frequency. One of the two paths is turned off upon occurrence of a desired condition, which reduces power consumption. In an embodiment, the condition is that the input signal does not contain an image signal of the signal of interest.
摘要翻译：在某些情况下消耗功率降低的接收机来恢复感兴趣的信号。接收机包含同相信道处理路径和用于将输入信号下变频到中频的正交相位通道路径，然后通过进一步处理中频输入信号来恢复感兴趣的信号。在出现所需条件时，两条路径之一被关闭，这降低了功耗。在一个实施例中，条件是输入信号不包含感兴趣的信号的图像信号。

98. 发明申请

US20050265465A1 MIMO decoding 有权
标题翻译： MIMO解码
公开(公告)号：US20050265465A1
公开(公告)日：2005-12-01
申请号：US10857417
申请日：2004-05-27
申请人： Srinath Hosur , Jaiganesh Balakrishnan , Muhammed Ikram , Manish Goel , Michael Polley
发明人： Srinath Hosur , Jaiganesh Balakrishnan , Muhammed Ikram , Manish Goel , Michael Polley
IPC分类号： H03D1/00 , H04B7/02 , H04B7/10 , H04L25/02 , H04L25/06 , H04L27/06 , H04L27/26
CPC分类号： H04L27/2647 , H04L25/0204 , H04L25/067
摘要： In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order. In a noisy environment, however, any incorrect decision made on a symbol in an iteration leaves its contribution in the updated received signal available for processing in the following iterations. Fortunately, if the level of interference is estimated and the soft bits are scaled appropriately by the estimated interference power, the performance of IMMSE receiver can be greatly improved. Preferred embodiments estimate the interference by computing the probability of error in decoding the symbols of the previous stage(s). The computation of decision error probability depends on the constellation size of transmitted symbols and introduces very little processing overhead.
摘要翻译：在采用LMMSE接收机的MIMO无线通信中，在存在由两个主要部分组成的干扰的接收机处估计通过发射天线发射的符号：一个由于加性噪声而导致的，另一个是由于通过剩余的天线。已经显示出妨碍通信系统的性能，导致不正确的符号决定，特别是在低SNR下。 IMMSE已被设计为解决这个问题的办法; 在IMMSE处理中，经由每个发送天线发送的符号被迭代地解码。在每个处理阶段，通过去除在先前迭代中检测到的符号的贡献来更新接收到的信号。原则上，这降低了嵌入期望符号的附加干扰。因此，干扰电平在处理顺序下降时单调减少。然而，在嘈杂的环境中，在迭代中对符号做出的任何不正确的决定使其在更新的接收信号中的贡献可用于在以下迭代中进行处理。幸运的是，如果估计干扰水平，并通过估计的干扰功率适当地缩放软比特，则可以大大提高IMMSE接收机的性能。优选实施例通过计算解码前一级的符号的误差概率来估计干扰。决策误差概率的计算取决于传输符号的星座大小，并引入很少的处理开销。

99. 发明授权

US06925131B2 Determining channel characteristics in a wireless communication system that uses multi-element antenna 有权
标题翻译：确定使用多单元天线的无线通信系统中的信道特性
公开(公告)号：US06925131B2
公开(公告)日：2005-08-02
申请号：US09922203
申请日：2001-08-03
申请人： Jaiganesh Balakrishnan , Harish Viswanathan
发明人： Jaiganesh Balakrishnan , Harish Viswanathan
IPC分类号： H04B1/707 , H04B7/04 , H04L25/02 , H04L27/00 , H08B1/02
CPC分类号： H04L25/0242 , H04B7/04 , H04B2201/70701 , H04L25/0204 , H04L25/0226
摘要： A method and apparatus for increasing in the data rate of a multiple-input and/or multiple-output system that has frequency selective fading by using training sequences with both low normalized auto-correlation and low normalized cross-correlation. Both 1) the sum of the square of the normalized auto-correlation of each training sequence over an auto-correlation window and 2) the sum of the square of the normalized cross-correlation of each pair of the training sequences over a cross-correlation window, are significantly less than unity. In one embodiment of the invention the training sequences are shifted versions of each other, and the low normalized cyclic-auto-correlation of cyclic sequences is significantly less than unity, with each cyclic sequence being N′, N′=N−L+1, symbols of one of the at least two training sequences. In another embodiment, the training sequences are ones where the trace of the inverse of the product of the matrix of training sequences' symbols and the conjugate transpose of this matrix is low. The matrix is a function of the number of symbols over which multipaths of significant power can arrive, the number of training sequences, and the number of symbols in a training sequence. More particularly the matrix is a block-toeplitzmatrix composed of the training symbols.
摘要翻译：一种用于通过使用具有低归一化自相关和低标准化互相关的训练序列来增加具有频率选择性衰落的多输入和/或多输出系统的数据速率的方法和装置。两者都是1）自相关窗口上每个训练序列的归一化自相关的平方和的总和，2）互交相关的每对训练序列的归一化互相关的平方和之和窗口，明显小于团结。在本发明的一个实施例中，训练序列是彼此的移位版本，循环序列的低归一化循环自相关显着小于单位，每个循环序列为N'，N'= N-L + 1 ，所述至少两个训练序列之一的符号。在另一个实施例中，训练序列是训练序列符号的矩阵与该矩阵的共轭转置的乘积的逆的轨迹较低的训练序列。矩阵是有效功率的多径可以到达的符号的数量，训练序列的数量以及训练序列中的符号数的函数。更具体地，矩阵是由训练符号组成的块对角矩阵。

100. 发明授权

US06611567B1 Method and apparatus for pulse shaping 失效
标题翻译：用于脉冲整形的方法和装置
公开(公告)号：US06611567B1
公开(公告)日：2003-08-26
申请号：US09240005
申请日：1999-01-29
申请人： Jaiganesh Balakrishnan , Markus Rupp
发明人： Jaiganesh Balakrishnan , Markus Rupp
IPC分类号： H04L2736
CPC分类号： H04L27/20 , H04L25/03834 , H04L27/36
摘要： In the method of pulse shaping according to the present invention, a set of bits representing a symbol is received, and an output value is generated by adding or subtracting a received coefficient and a received value based on a first predetermined one of the set of bits. The generated output value is then supplied as either a real or imaginary output value based on at least a second predetermined one of the set of bits.
摘要翻译：在根据本发明的脉冲整形的方法中，接收表示符号的一组比特，并且通过基于该组比特中的第一预定的一个加上或减去接收的系数和接收的值来生成输出值。所产生的输出值然后基于该组位中的至少第二预定的一个被提供为实数或虚数输出值。

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