公开(公告)号：US20100002817A1

公开(公告)日：2010-01-07

申请号：US12324818

申请日：2008-11-26

Applicant: Bojan Vrcelj ,  Krishna Kiran Mukkavilli

Inventor： Bojan Vrcelj ,  Krishna Kiran Mukkavilli

IPC: H04L7/00

CPC classification number: H04L25/0212 ,  H04L27/2662 ,  H04L27/2665

Abstract: 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.

Abstract translation: 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：US20090274099A1

公开(公告)日：2009-11-05

申请号：US12433845

申请日：2009-04-30

Applicant: Qiang Gao ,  An Mei Chen ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli ,  Murali Ramaswamy Chari

Inventor： Qiang Gao ,  An Mei Chen ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli ,  Murali Ramaswamy Chari

IPC: H04W8/00

CPC classification number: H04H60/50 ,  G01S5/0226 ,  G01S5/14 ,  H04H20/28 ,  H04H60/51 ,  H04L67/18 ,  H04W4/029 ,  H04W4/18

Abstract: Methods and apparatus for communicating transmitter information in a communication network are disclosed. The methods and apparatus communicate transmitter specific information, in particular, which includes location information about network transmitters for use in location or positioning type services. The disclosed methods and apparatus include inserting such transmitter specific information within either a data flow of at least one transmission frame or a control channel in the at least one transmission frame. In addition, a transmitter identifier is encoded in a positioning pilot channel (PPC) within the at least one transmission frame, and the configured transmission frame transmitted to a user device. The user device may use the transmitter specific information of numerous transmitters along with the transmitter identifiers to measure how far it is from the transmitters, and then triangulate to determine position.

Abstract translation: 公开了在通信网络中传送发射机信息的方法和装置。 所述方法和装置特别地传送发射机特定信息，所述信息包括关于用于定位或定位类型业务的网络发射机的位置信息。 所公开的方法和装置包括在至少一个传输帧中的至少一个传输帧或控制信道的数据流内插入这样的发射机特定信息。 此外，发射机标识符被编码在至少一个传输帧内的定位导频信道（PPC）中，并且配置的传输帧被发送到用户设备。 用户设备可以使用多个发射机的发射机特定信息以及发射机标识符来测量它与发射机的距离，然后进行三角测量以确定位置。

公开(公告)号：US20090245154A1

公开(公告)日：2009-10-01

申请号：US12334436

申请日：2008-12-12

Applicant: Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Durk L. van Veen ,  Murali Ramaswamy Chari ,  Raghuraman Krishnamoorthi ,  Rajeev Krishnamurthi ,  Fuyun Ling

Inventor： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Durk L. van Veen ,  Murali Ramaswamy Chari ,  Raghuraman Krishnamoorthi ,  Rajeev Krishnamurthi ,  Fuyun Ling

IPC: H04H20/71 ,  H04J11/00

CPC classification number: H04L23/02 ,  H04L5/0053 ,  H04L25/0206 ,  H04L25/0218 ,  H04L25/023 ,  H04L27/2613 ,  H04L27/2647

Abstract: In a multicasts wireless telecommunication system providing an aggregation of one or more independent data components as a flow, wherein the OIS is located at the latch point of the beginning of the superframe, and the OIS programming is latched at the superframe boundary, the improvement of deriving signal parameter information from Signaling Parameter Channel (SPC) symbols transmitted in a Forward Link only (FLO) network by deriving a time domain channel estimate by assuming each of the combinations for the signal parameter field in the scrambler seed and picking the signal parameter combination that yields the most energy in the time domain above a threshold value.

Abstract translation: 在提供作为流的一个或多个独立数据组件的聚合的组播无线电信系统中，其中OIS位于超帧开始的锁存点处，并且OIS编程在超帧边界处被锁存， 通过通过假设加扰器种子中的信号参数字段的每个组合并且选择信号参数组合来导出时域信道估计，从​​在仅前向链路（FLO）网络中发送的信令参数信道（SPC）符号中导出信号参数信息 其在时域中产生的能量大于阈值以上。

公开(公告)号：US20090028257A1

公开(公告)日：2009-01-29

申请号：US11834669

申请日：2007-08-06

Applicant: Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Tao Tian

Inventor： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Tao Tian

IPC: H04K1/10

CPC classification number: H04W48/16 ,  H04L27/2647

Abstract: A method of acquiring a forward link only (FLO) network in a radio frequency (RF) in a wireless communication environment, includes selecting a RF from a first list; selecting a signal parameter (SP) from a second list; determining if a first parameter is found using the selected RF and SP; and, upon determination that the first parameter is found, enabling the use of the selected RF and SP to communicate in the FLO network. An apparatus for implementing the method is also disclosed.

Abstract translation: 一种在无线通信环境中在射频（RF）中获取前向链路（FLO）网络的方法，包括从第一列表中选择RF; 从第二列表中选择信号参数（SP）; 使用所选择的RF和SP确定是否发现第一参数; 并且在确定发现第一参数之后，使所选择的RF和SP能够在FLO网络中进行通信。 还公开了一种用于实现该方法的装置。

公开(公告)号：US20090028256A1

公开(公告)日：2009-01-29

申请号：US11834653

申请日：2007-08-06

Applicant: Durk L. van Veen ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

Inventor： Durk L. van Veen ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

IPC: H04L27/28

CPC classification number: H04L27/2613 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/008 ,  H04L5/0094 ,  H04L27/2607 ,  H04L27/2626 ,  H04L27/2628 ,  H04L27/2647 ,  H04L27/2656

Abstract: A new channel is added to FLO networks that carries embedded signaling parameter information. The design is such that regardless of the actual values of the signaling parameters conveyed, a receiver will be able to demodulate this new channel. Moreover, the addition of the new channel does not render a FLO network that has been so configured to not be backwards-compatible with existing devices.

Abstract translation: 一个新的信道被添加到携带嵌入式信令参数信息的FLO网络中。 这种设计使得无论传达的信令参数的实际值如何，接收机将能够解调这个新的信道。 此外，添加新频道并不会使FLO网络被配置为不与现有设备向后兼容。

公开(公告)号：US20080159449A1

公开(公告)日：2008-07-03

申请号：US11674632

申请日：2007-02-13

Applicant: Tao Tian ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

Inventor： Tao Tian ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

IPC: H04L25/08

CPC classification number: H04L27/2657

Abstract: 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.

Abstract translation: 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：US20080123540A1

公开(公告)日：2008-05-29

申请号：US11563627

申请日：2006-11-27

Applicant: Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi

Inventor： Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi

IPC: H04J1/16

CPC classification number: H04B1/1027

Abstract: Methods and apparatus for signal and interference energy estimation in a communication system. In an aspect, a method includes setting a threshold value, and comparing a channel estimate to the threshold value to determine an interference estimate (Iest). The method also includes averaging the interference estimate (Iest) to determine average channel interference (Ic), and determining interference energy (I) based on the interference estimate (Iest) and the average channel interference (Ic). In another aspect, an apparatus includes threshold logic configured to set a threshold value and compare a channel estimate to the threshold value to determine an interference estimate (Iest). The apparatus includes averaging logic configured to average the interference estimate (Iest) to determine average channel interference (Ic), and summing logic configured to determine interference energy (I) based on the interference estimate (Iest) and average channel interference (Ic).

Abstract translation: 通信系统中信号和干扰能量估计的方法和装置。 一方面，一种方法包括设置阈值，以及将信道估计与阈值进行比较，以确定干扰估计（I est）。 该方法还包括对干扰估计进行平均以确定平均信道干扰（I SUB），以及基于干扰估计（I）来确定干扰能量（I） ＆lt; SUB＆gt;）和平均信道干扰（I SUB）。 在另一方面，一种装置包括阈值逻辑，其配置成设置阈值并将信道估计与阈值进行比较以确定干扰估计（I est）。 所述装置包括被配置为平均干扰估计（I＆gt;）以确定平均信道干扰（I SUB）的平均逻辑，以及被配置为确定干扰能量（I） 基于干扰估计（I EST）和平均信道干扰（I SUB）。

公开(公告)号：US07336727B2

公开(公告)日：2008-02-26

申请号：US10923056

申请日：2004-08-19

Applicant: Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

Inventor： Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

IPC: H04L27/00

CPC classification number: H04B7/0417 ,  H04B7/043 ,  H04B7/0443 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/0663

Abstract: The telecommunications system described herein implements a multi-rank beamformer for use in wireless systems equipped with multiple transmit and multiple receive antennas. The multi-rank beamformer uses finite-rate feedback of channel conditions to achieves close to theoretical performance indicated by the water-filling algorithm, while avoiding the computational complexity associated with space time codes. In addition, the multi-rank beamforming system described herein improves on the performance of unit rank beamforming methods by maintaining the gains over space time codes over a broader range of transmission rates.

Abstract translation: 本文描述的电信系统实现用于配备有多个发射和多个接收天线的无线系统中的多等级波束形成器。 多级波束形成器使用信道条件的有限速率反馈来实现接近灌水算法所指示的理论性能，同时避免与时空码相关的计算复杂度。 另外，本文描述的多级波束成形系统通过在更宽的传输速率范围内保持空间时间码的增益来改善单位秩波束成形方法的性能。

公开(公告)号：US07330701B2

公开(公告)日：2008-02-12

申请号：US10533248

申请日：2003-10-29

Applicant: Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

Inventor： Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

IPC: H04B1/00 ,  H04B7/00

CPC classification number: H04B7/0639 ,  H01Q21/00 ,  H04B7/0443 ,  H04B7/0617 ,  H04B7/0669 ,  H04W52/42

Abstract: Beamforming systems having a few bits of channel state information fed back to the transmitter benefit from low complexity decoding structures and performances gains compared with systems that do not have channel state feedback. Both unit rank and higher rank systems are implemented. Substantial design effort may be avoided by following a method of using functions formulated for space-time systems with the change that the channel coherence time is equated to the number of transmit antennas and the number of antennas in the space-time formulation is fixed at one.

Abstract translation: 具有反馈到发射机的几比特信道状态信息的波束成形系统与没有信道状态反馈的系统相比，受益于低复杂性解码结构和性能增益。 实现了单位级和高级制。 通过遵循使用为空时系统制定的功能的方法可以避免大量的设计努力，其中信道相干时间等于发射天线的数量，并且时空公式中的天线数量固定在一个 。

公开(公告)号：US20070153924A1

公开(公告)日：2007-07-05

申请号：US11516910

申请日：2006-09-06

Applicant: Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Gordon Kent Walker

Inventor： Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Gordon Kent Walker

IPC: H04K1/10

CPC classification number: H04L1/20 ,  H04L27/2602 ,  H04L27/2647

Abstract: Methods and apparatus for noise estimation in a communication system. In an aspect, a method for noise and interference estimation is provided. The method includes identifying one or more unmodulated subcarriers in a received waveform, processing the one or more unmodulated subcarriers to produce a demodulated output, and determining a noise variance based on the demodulated output. In another aspect, an apparatus for providing a noise and interference estimation is provided. The apparatus includes selection logic configured to identify one or more unmodulated subcarriers in a received waveform, a processor configured to demodulate the one or more unmodulated subcarriers to produce a demodulated output, and variance determination logic configured to determine a noise variance based on the demodulated output.

Abstract translation: 通信系统中噪声估计的方法和装置。 在一方面，提供了一种用于噪声和干扰估计的方法。 该方法包括识别接收波形中的一个或多个未调制副载波，处理一个或多个未调制副载波以产生解调输出，以及基于解调输出确定噪声方差。 另一方面，提供了一种用于提供噪声和干扰估计的装置。 所述设备包括被配置为识别接收波形中的一个或多个未调制子载波的选择逻辑，被配置为对所述一个或多个未调制子载波进行解调以产生解调输出的处理器，以及配置为基于解调输出来确定噪声方差的方差确定逻辑 。