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1. 发明申请

US20060109922A1 Iterative channel and interference estimation with dedicated pilot tones for OFDMA 有权
标题翻译：用于OFDMA的专用导频音的迭代信道和干扰估计
公开(公告)号：US20060109922A1
公开(公告)日：2006-05-25
申请号：US11182235
申请日：2005-07-15
申请人： Alexei Gorokhov , Avneesh Agrawal , Arvind Keerthi
发明人： Alexei Gorokhov , Avneesh Agrawal , Arvind Keerthi
IPC分类号： H04K1/10 , H04B7/204
CPC分类号： H04L25/0236 , H04L5/0007 , H04L5/0048 , H04L5/023 , H04L25/0248 , H04L27/2647
摘要： Estimation of channel characteristics and interference level in a time-varying multi-carrier multi-user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. Next, an initial estimate value is selected for the interference level. The initial estimate value for the interference level is used together with the received pilot symbols to provide a first estimate of the channel. The first estimate of the channel is used to determine a new updated value for the interference level, which in turn, is used to update the value of the first estimate of the channel iteratively. The iterations continue until the iteratively updated values of the interference level and channel satisfy predefined limits. The data symbols and the final updated value of the channel are subsequently used to provide a second estimate for the channel.
摘要翻译：并行执行时变多载波多用户系统中的信道特性和干扰电平的估计。为了执行估计，通过信道发送多个数据符号和专用导频符号。接下来，针对干扰电平选择初始估计值。干扰电平的初始估计值与接收到的导频符号一起使用以提供信道的第一估计。信道的第一估计用于确定用于干扰电平的新的更新值，其又用于迭代地更新信道的第一估计值。迭代继续，直到干扰电平和通道的迭代更新值满足预定义的限制。随后使用数据符号和信道的最终更新值来提供信道的第二估计。

2. 发明申请

US20070147539A1 HIERARCHICAL CODING FOR MULTICAST MESSAGES 有权
标题翻译：多媒体信息的分层编码
公开(公告)号：US20070147539A1
公开(公告)日：2007-06-28
申请号：US11567014
申请日：2006-12-05
申请人： Alexei Gorokhov , Avneesh Agrawal , Arvind Keerthi
发明人： Alexei Gorokhov , Avneesh Agrawal , Arvind Keerthi
IPC分类号： H04L27/00
CPC分类号： H03M13/2945 , H03M13/2903 , H03M13/2948 , H03M13/2978 , H03M13/6362 , H03M13/6513 , H04L1/0041 , H04L1/005 , H04L1/0065 , H04L1/007 , H04L5/023 , H04L2001/0093 , H04N21/2381 , H04N21/2383 , H04N21/2402 , H04N21/2404 , H04N21/2405 , H04N21/6405 , H04N21/6408
摘要： Techniques for sending signaling information using hierarchical coding are described. With hierarchical coding, individual messages for users are encoded using multiple interconnected encoders such that (1) the message for each user is sent at a data rate suitable for that user and (2) a single multicast message is generated for the messages for all users. A base station determines data rates supported by the users and the code rates to achieve these data rates. Each data rate is determined by one or more code rates. Signaling information for the users is mapped to data blocks to be sent at different data rates. Each data block is then encoded in accordance with the code rate(s) associated with the data rate for that data block. A final coded block is generated for all users and transmitted. Each user performs the complementary decoding to recover the message sent to that user.
摘要翻译：描述使用分层编码发送信令信息的技术。使用分层编码，使用多个互连的编码器对用户的各个消息进行编码，使得（1）以适合于该用户的数据速率发送每个用户的消息，以及（2）为所有用户生成消息的单个多播消息。基站确定用户支持的数据速率和码率来实现这些数据速率。每个数据速率由一个或多个码率决定。将用户的信令信息映射到以不同数据速率发送的数据块。然后根据与该数据块的数据速率相关联的码率对每个数据块进行编码。为所有用户生成最终编码块并进行传输。每个用户执行补充解码以恢复发送给该用户的消息。

3. 发明申请

US20050163194A1 Interference estimation in a wireless communication system 审中-公开
标题翻译：无线通信系统中的干扰估计
公开(公告)号：US20050163194A1
公开(公告)日：2005-07-28
申请号：US11022489
申请日：2004-12-22
申请人： Dhananjay Gore , Avneesh Agrawal , Arvind Keerthi
发明人： Dhananjay Gore , Avneesh Agrawal , Arvind Keerthi
IPC分类号： H04B1/713 , H04B7/005 , H04L5/02
CPC分类号： H04B1/7143 , H04B1/715 , H04B2001/7154 , H04L5/023 , H04W52/38 , H04W52/42 , H04W52/44
摘要： Interference may be controlled by selectively blanking or attenuating transmit powers. A method of estimating interference caused by a transmitting entity in a wireless communication system comprises determining a desired level of accuracy in an interference estimate, determining a required number of blanks per subband set to achieve the desired level of accuracy, inserting the required number of blanks per subband set into a frequency hopping (FH) sequence, and transmitting according to the FH sequence.
摘要翻译：可以通过选择性地消隐或衰减发射功率来控制干扰。一种在无线通信系统中估计由发射实体引起的干扰的方法包括：确定干扰估计中期望的准确度水平，确定每个子带集所需的空白数以达到期望的精度水平，插入所需数量的空白每个子带设置成跳频（FH）序列，并根据FH序列进行发送。

4. 发明申请

US20110032033A1 PRE-DISTORTION AND MEMORY COMPENSATION APPARATUS 有权
标题翻译：预失真和记忆补偿装置
公开(公告)号：US20110032033A1
公开(公告)日：2011-02-10
申请号：US12909649
申请日：2010-10-21
申请人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
发明人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
IPC分类号： H03F1/26
CPC分类号： H04L27/368 , H03F1/0222 , H03F1/0266 , H03F1/3211 , H03F1/3247 , H03F1/3258 , H03F3/45183 , H03F2200/102 , H03F2200/369 , H03F2200/451 , H03F2203/45352
摘要： Pre-distortion and memory compensation apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.
摘要翻译：提供了用于非线性分量的预失真和存储器补偿装置和方法。该装置包括用于产生多个相关系数的自适应块，其用于加权多个合成工作函数以对给定信号进行预失真。自适应块可以由从非线性分量输出信号的反馈信号和输入信号的延迟版本产生的误差信号驱动。该装置能够以射频直接操作。还提供了用于产生正交信号，采用负电阻的跨导放大，可变增益放大和包络检测的装置和方法。

5. 发明授权

US08229027B2 Pre-distortion and memory compensation apparatus 有权
标题翻译：预失真和记忆补偿装置
公开(公告)号：US08229027B2
公开(公告)日：2012-07-24
申请号：US12909649
申请日：2010-10-21
申请人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
发明人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
IPC分类号： H04K1/02 , H04L25/03 , H04L25/49
CPC分类号： H04L27/368 , H03F1/0222 , H03F1/0266 , H03F1/3211 , H03F1/3247 , H03F1/3258 , H03F3/45183 , H03F2200/102 , H03F2200/369 , H03F2200/451 , H03F2203/45352
摘要： Pre-distortion and memory compensation apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.
摘要翻译：提供了用于非线性分量的预失真和存储器补偿装置和方法。该装置包括用于产生多个相关系数的自适应块，其用于加权多个合成工作函数以对给定信号进行预失真。自适应块可以由从非线性分量输出信号的反馈信号和输入信号的延迟版本产生的误差信号驱动。该装置能够以射频直接操作。还提供了用于产生正交信号，采用负电阻的跨导放大，可变增益放大和包络检测的装置和方法。

6. 发明授权

US07844014B2 Pre-distortion apparatus 有权
标题翻译：预失真装置
公开(公告)号：US07844014B2
公开(公告)日：2010-11-30
申请号：US11484008
申请日：2006-07-07
申请人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
发明人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
IPC分类号： H04K1/02 , H04L25/03 , H04L25/49
CPC分类号： H04L27/368 , H03F1/0222 , H03F1/0266 , H03F1/3211 , H03F1/3247 , H03F1/3258 , H03F3/45183 , H03F2200/102 , H03F2200/369 , H03F2200/451 , H03F2203/45352
摘要： Pre-distortion apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.
摘要翻译：提供了用于非线性分量的预失真装置和方法。该装置包括用于产生多个相关系数的自适应块，其用于加权多个合成工作函数以对给定信号进行预失真。自适应块可以由从非线性分量输出信号的反馈信号和输入信号的延迟版本产生的误差信号驱动。该装置能够以射频直接操作。还提供了用于产生正交信号，采用负电阻的跨导放大，可变增益放大和包络检测的装置和方法。

7. 发明申请

US20080008263A1 Pre-distortion apparatus 有权
标题翻译：预失真装置
公开(公告)号：US20080008263A1
公开(公告)日：2008-01-10
申请号：US11484008
申请日：2006-07-07
申请人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
发明人： Arvind Keerthi , Madabusi Govindarajan , P. Vijay Kumar , John Choma , Abhijit Shanbhag
IPC分类号： H04L25/49
CPC分类号： H04L27/368 , H03F1/0222 , H03F1/0266 , H03F1/3211 , H03F1/3247 , H03F1/3258 , H03F3/45183 , H03F2200/102 , H03F2200/369 , H03F2200/451 , H03F2203/45352
摘要： Pre-distortion apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.
摘要翻译：提供了用于非线性分量的预失真装置和方法。该装置包括用于产生多个相关系数的自适应块，其用于加权多个合成工作函数以对给定信号进行预失真。自适应块可以由从非线性分量输出信号的反馈信号和输入信号的延迟版本产生的误差信号驱动。该装置能够以射频直接操作。还提供了用于产生正交信号，采用负电阻的跨导放大，可变增益放大和包络检测的装置和方法。

8. 发明申请

US20050282568A1 Time synchronization using spectral estimation in a communication system 有权
标题翻译：在通信系统中使用频谱估计的时间同步
公开(公告)号：US20050282568A1
公开(公告)日：2005-12-22
申请号：US11021694
申请日：2004-12-22
申请人： Arvind Keerthi
发明人： Arvind Keerthi
IPC分类号： H04B7/26 , H04L7/04 , H04L25/02 , H04L27/26 , G01S1/24
CPC分类号： H04L7/041
摘要： To perform time synchronization using spectral estimation, a receiver obtains a frequency response estimate for pilot symbols received on each set of frequency subbands used for pilot transmission. The receiver performs spectral estimation on frequency response estimates for different sets of subbands to obtain a measured arrival time for a transmission from a transmitter. The spectral estimation determines a dominant frequency component in the frequency response estimates and derives the measured arrival time based on this dominant frequency component. A time error between the measured arrival time and a desired arrival time is computed and possibly filtered. The filtered or unfiltered time error is scaled with a fixed or adjustable gain. A time adjustment is then generated based on the scaled time error and using linear and/or non-linear functions. The time adjustment is sent to the transmitter and used to adjust the transmit timing at the transmitter.
摘要翻译：为了使用频谱估计来执行时间同步，接收机获得在用于导频传输的每组频率子带上接收的导频符号的频率响应估计。接收机对不同子带组的频率响应估计进行频谱估计，以获得来自发射机的传输的测量到达时间。频谱估计确定频率响应估计中的主要频率分量，并且基于该主要频率分量导出测量的到达时间。计算测量到达时间与期望到达时间之间的时间误差，并可能过滤。滤波或未滤波的时间误差用固定或可调增益进行缩放。然后基于缩放的时间误差并使用线性和/或非线性函数来产生时间调整。时间调整发送到发射机，用于调整发射机的发射定时。

9. 发明申请

US20050163257A1 Channel estimation for a communication system using spectral estimation 失效
标题翻译：使用频谱估计的通信系统的信道估计
公开(公告)号：US20050163257A1
公开(公告)日：2005-07-28
申请号：US11021292
申请日：2004-12-22
申请人： Arvind Keerthi
发明人： Arvind Keerthi
IPC分类号： H04L25/02 , H04L27/26 , H04L27/06
CPC分类号： H04L25/0248 , H04L25/0224 , H04L27/2647
摘要： Techniques for performing channel estimation in a multi-carrier system are described. A frequency response estimate is initially obtained for a wireless channel based on a narrowband pilot sent on different sets of subbands in different symbol periods or a wideband pilot sent on all or most subbands in the system. Spectral estimation is performed on the frequency response estimate to determine at least one frequency component of the frequency channel estimate, with each frequency component being indicative of a delay for a channel tap in an impulse response estimate for the wireless channel. A channel estimate for the wireless channel is then obtained based on the frequency component(s) determined by the spectral estimation. This channel estimate may be a channel profile, the impulse response estimate, an improved frequency response estimate, a signal arrival time, or some other pertinent information regarding the wireless channel.
摘要翻译：描述用于在多载波系统中执行信道估计的技术。基于在不同符号周期的不同子带集合上发送的窄带导频或在系统中的所有或大多数子带上发送的宽带导频，最初获得针对无线信道的频率响应估计。对频率响应估计执行频谱估计以确定频道估计的至少一个频率分量，其中每个频率分量指示无线信道的脉冲响应估计中的信道抽头的延迟。然后基于由频谱估计确定的频率分量来获得无线信道的信道估计。该信道估计可以是关于无线信道的信道简档，脉冲响应估计，改进的频率响应估计，信号到达时间或一些其他相关信息。

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