公开(公告)号：US07844018B2

公开(公告)日：2010-11-30

申请号：US11674632

申请日：2007-02-13

申请人： Tao Tian ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

发明人： Tao Tian ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

IPC分类号： H04L25/08

CPC分类号： H04L27/2657

摘要： An OFDM telecommunications system includes a transmitter and a receiver. The receiver includes a canceller configured to reduce inter-carrier interference (ICI) in an OFDM symbol in the frequency domain.

摘要翻译： OFDM电信系统包括发射机和接收机。 接收机包括被配置为减少频域中的OFDM符号中的载波间干扰（ICI）的消除器。

公开(公告)号：US20100002781A1

公开(公告)日：2010-01-07

申请号：US12165661

申请日：2008-07-01

申请人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Ben A. Saidi ,  William A. Drennen

发明人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Ben A. Saidi ,  William A. Drennen

IPC分类号： H04L27/28

CPC分类号： H04W16/18 ,  H04W88/08

摘要： A methodology for transmitter identification for a single frequency network is provided using a single CW tone. The tone can be transmitted outside the transmitter's active band. It is possible to arrive at significant overlap between the tone coverage area and the coverage area of a neighboring transmitter without disturbing the operations by picking the tone location and power appropriately.

摘要翻译： 使用单个CW音调提供用于单频网络的发射机识别的方法。 音调可以在发射器的有源频带外传输。 可以通过适当地选择音调位置和功率来抵消音调覆盖区域和相邻发射机的覆盖区域之间的重大重叠，而不会干扰操作。

公开(公告)号：US20070153743A1

公开(公告)日：2007-07-05

申请号：US11517119

申请日：2006-09-06

申请人： Krishna Kiran Mukkavilli ,  Fuyun Ling ,  Gordon Kent Walker ,  Murali Ramaswamy Chari

发明人： Krishna Kiran Mukkavilli ,  Fuyun Ling ,  Gordon Kent Walker ,  Murali Ramaswamy Chari

IPC分类号： H04Q7/00

CPC分类号： G01S5/0205 ,  H04L5/0053 ,  H04W24/00 ,  H04W64/00

摘要： Methods and apparatus for position location in a wireless network. In an aspect, a method is provided that includes determining whether a symbol to be transmitted is an active symbol, wherein the symbol comprises a plurality of subcarriers, and encoding identification information on a first portion of subcarriers if it is determined that the symbol is the active symbol. The method also includes encoding idle information on a second portion of subcarriers if it is determined that the symbol in not the active symbol. In an aspect, an apparatus includes detector logic configured to decode a plurality of symbols to determine identification information that identifies a plurality of transmitters, and to determine a plurality of channel estimate associated with the plurality of transmitters. The apparatus also includes position determination logic configured to calculate a device position based on the plurality of transmitters and the plurality of channel estimates.

摘要翻译： 无线网络中位置定位的方法和装置。 一方面，提供了一种方法，其包括确定要发送的符号是否是活动符号，其中，所述符号包括多个子载波，并且如果确定所述符号是所述符号是所述符号，则对所述子载波的第一部分编码识别信息 活动符号 如果确定不在活动符号中的符号，则该方法还包括对子载波的第二部分上的空闲信息进行编码。 一方面，一种装置包括检测器逻辑，其被配置为对多个符号进行解码以确定标识多个发射机的识别信息，并且确定与多个发射机相关联的多个信道估计。 该装置还包括位置确定逻辑，其被配置为基于多个发射机和多个信道估计来计算设备位置。

公开(公告)号：US20230216627A1

公开(公告)日：2023-07-06

申请号：US17996755

申请日：2020-06-28

申请人： Runxin WANG ,  Muhammad Sayed Khairy ABDELGHAFFAR ,  Yu ZHANG ,  Krishna Kiran MUKKAVILLI ,  Hwan Joon KWON ,  QUALCOMM Incorporated

发明人： Runxin Wang ,  Muhammad Sayed Khairy Abdelghaffar ,  Yu Zhang ,  Krishna Kiran Mukkavilli ,  Hwan Joon Kwon

IPC分类号： H04L5/00 ,  H04W24/10

CPC分类号： H04L5/0035 ,  H04L5/0048 ,  H04L5/0091 ,  H04W24/10

摘要： Aspects of the disclosure relate to radio access networks with a capability to dynamically reconfigure a number of transmission-reception points (TRPs) in a single-frequency network (SFN) based on channel measurements. In one example, a mobile device receives a configuration message including a plurality of transmission configuration indicator (TCI) states, and potentially further including an indication identifying one or more of the TCI states as main TCI states. The message may further include an indication that it includes the plurality of TCI states. The UE receives a downlink traffic channel and demodulates the traffic channel based on only a subset of the TCI states (e.g., the main TCI state (s)). The UE further measures one or more channel parameters corresponding to each TCI state of the plurality of TCI states, and transmits a channel state information report based on the channel parameters. Other aspects, embodiments, and features are also claimed and described.

公开(公告)号：US08477809B2

公开(公告)日：2013-07-02

申请号：US11834671

申请日：2007-08-06

申请人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

发明人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

IPC分类号： H04J3/06 ,  H04J9/00 ,  H04W4/00 ,  H04L27/28

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0044 ,  H04L25/0224

摘要： A transmitter or receiver device includes a processing system configured to have one or more pilot interlace vectors and one or more distance vectors. The processing system is further configured to generate a first slot interlace for a first slot based on the one or more pilot interlace vectors, and is further configured to generate a second slot interlace for a second slot based on the first slot interlace and the one or more distance vectors. Additional slot interlaces for all other slots may also be generated based on the first slot interlace and the one or more distance vectors.

摘要翻译： 发射机或接收机设备包括被配置为具有一个或多个导频交织向量和一个或多个距离向量的处理系统。 所述处理系统还被配置为基于所述一个或多个导频交错向量来生成用于第一时隙的第一时隙交织，并且还被配置为基于所述第一时隙交织和所述第一时隙交织而生成用于第二时隙的第二时隙交织， 更多距离矢量。 也可以基于第一时隙交错和一个或多个距离矢量来生成用于所有其他时隙的附加时隙交织。

公开(公告)号：US09356752B2

公开(公告)日：2016-05-31

申请号：US12948759

申请日：2010-11-18

申请人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

发明人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

IPC分类号： H04L5/00 ,  H04L27/26

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

公开(公告)号：US08144818B2

公开(公告)日：2012-03-27

申请号：US11303487

申请日：2005-12-15

申请人： Krishna Kiran Mukkavilli ,  Michael Mao Wang ,  Raghuraman Krishnamoorthi

发明人： Krishna Kiran Mukkavilli ,  Michael Mao Wang ,  Raghuraman Krishnamoorthi

IPC分类号： H03D1/00

CPC分类号： H04L27/2662 ,  H04L25/0202 ,  H04L27/2686

摘要： Apparatus and methods for use in a wireless communication system are disclosed for determining a timing position for channel activity in order to resolve timing ambiguity. A disclosed apparatus includes a processor that determines when channel activity occurs in at least one of an early or a late arrival position in a communication channel estimate and unwraps the channel activity in either the early arrival position or the late arrival position to a corresponding late or early arrival unwrapped channel activity position in the wireless channel estimate. The processor correlates symbol data in the communication signal corresponding to both the channel activity and the unwrapped channel activity to symbol data of the main channel activity. The processor determines whether a correct timing position of the channel activity is one of the early or late arrival positions based on the correlations, thus resolving timing ambiguity. Complementary methods are also disclosed.

摘要翻译： 公开了用于无线通信系统中的装置和方法，用于确定信道活动的定时位置，以便解决定时模糊。 所公开的装置包括处理器，其确定在通信信道估计中的早期或迟到到达位置中的至少一个中何时发生信道活动，并且将早期到达位置或延迟到达位置中的信道活动解包到相应的延迟或 在无线信道估计中提前到达解开的频道活动位置。 处理器将对应于信道活动和解开的信道活动的通信信号中的符号数据与主信道活动的符号数据相关联。 处理器基于相关性确定信道活动的正确定时位置是早期还是迟到位置之一，从而解决定时模糊度。 还公开了互补方法。

公开(公告)号：US07746963B2

公开(公告)日：2010-06-29

申请号：US11557921

申请日：2006-11-08

申请人： Seong Taek Chung ,  Krishna Kiran Mukkavilli ,  Vinay Murthy ,  Tao Tian

发明人： Seong Taek Chung ,  Krishna Kiran Mukkavilli ,  Vinay Murthy ,  Tao Tian

IPC分类号： H04L27/00

CPC分类号： H04L27/2657 ,  H04L27/2675

摘要： Methods and apparatus for frequency tracking of a received signal. In an aspect, a method is provided wherein the received signal comprises one or more symbols having a periodic structure. The method comprises receiving a plurality of samples of a selected symbol that comprises pilot signals scrambled with data and determining a window size and a periodicity factor. The method also comprises accumulating a correlation between samples in a first window and samples in a second window to produce an accumulated correlation value, wherein the first and second windows have a size and a separation based on the window size and the periodicity factor, respectively, and deriving a frequency error estimate based on the accumulated correlation value.

摘要翻译： 接收信号频率跟踪的方法和装置。 在一方面，提供了一种方法，其中接收的信号包括具有周期性结构的一个或多个符号。 该方法包括：接收包含由数据加扰的导频信号和确定窗口大小和周期因子的所选符号的多个样本。 该方法还包括在第一窗口中累积样本之间的相关性并在第二窗口中采样以产生累加的相关值，其中第一和第二窗口分别具有基于窗口大小和周期性因子的大小和间隔， 以及基于所累积的相关值导出频率误差估计。

公开(公告)号：US08265214B2

公开(公告)日：2012-09-11

申请号：US12324818

申请日：2008-11-26

申请人： Bojan Vrcelj ,  Krishna Kiran Mukkavilli

发明人： Bojan Vrcelj ,  Krishna Kiran Mukkavilli

IPC分类号： H04L7/00

CPC分类号： H04L25/0212 ,  H04L27/2662 ,  H04L27/2665

摘要： An adaptive timing synchronization process dynamically adapts timing synchronization parameters for both wide and local area channels based on channel estimates. Timing synchronization parameters are dynamically adapted according to C/I estimates calculated from WID/LID energies. The timing synchronization algorithm 102 takes as the primary input, the current channel estimate 110 and produces an output comprising a correction to the current Fast Fourier Transform (FFT) sampling window position delta T (or offset) for locating the start of data within a current symbol 108. After dynamic parameter adjustment of noise filtering thresholds 104 and weak channel tap sensitivities 106 based on a calculated C/I from the channel estimate, a timing synchronization algorithm 102 locates the beginning of each continuous symbol by finding the boundary between the preamble, or cyclic prefix, and the useful data portions interlaced with pilots for channel information defining the start of a symbol 108.

摘要翻译： 基于信道估计，自适应定时同步过程动态地适应广域和局域信道的定时同步参数。 定时同步参数根据从WID / LID能量计算的C / I估计动态调整。 定时同步算法102将当前信道估计110作为主要输入，并产生包括对当前快速傅立叶变换（FFT）采样窗位置增量T（或偏移）的校正的输出，用于定位当前数据的开始 基于来自信道估计的计算出的C / I，在噪声滤波阈值104和弱信道抽头灵敏度106的动态参数调整之后，定时同步算法102通过找到前导码之间的边界来定位每个连续符号的开始， 或循环前缀，并且有用数据部分与用于定义符号108的开始的信道信息的导频隔行扫描。

公开(公告)号：US20110058469A1

公开(公告)日：2011-03-10

申请号：US12948759

申请日：2010-11-18

申请人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

发明人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

IPC分类号： H04J11/00 ,  H04L27/28

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

摘要翻译： 这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。 导频可以被构造成单个OFDM符号和/或多个OFDM符号。 用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。 多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。 几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。