公开(公告)号：US08040965B2

公开(公告)日：2011-10-18

申请号：US12499951

申请日：2009-07-09

申请人： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

发明人： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

IPC分类号： H04L27/28

CPC分类号： H04W52/346 ,  H04L1/0009 ,  H04L1/0068 ,  H04L1/06 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/06 ,  H04L25/03343 ,  H04L2001/0096 ,  H04W52/24 ,  H04W52/42

摘要： Techniques to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbols and pre-weighting the modulation symbols for each selected channel based on the channel's characteristics. The pre-weighting may be achieved by “inverting” the selected channels so that the received SNRs are approximately similar for all selected channels. With selective channel inversion, only channels having SNRs at or above a particular threshold are selected, “bad” channels are not used, and the total available transmit power is distributed across only “good” channels. Improved performance is achieved due to the combined benefits of using only the NS best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

摘要翻译： 用于处理数据以在从所有可用传输信道中选择的一组传输信道上进行传输的技术。 在一方面，数据处理包括基于公共编码和调制方案的编码数据，以提供调制符号并且基于该信道的特征对每个所选择的信道预先加权调制符号。 预加权可以通过“反转”所选择的信道来实现，使得接收的SNR对于所有选择的信道大致相似。 通过选择性信道反转，仅选择具有等于或高于特定阈值的SNR的信道，不使用“坏”信道，并且总可用发射功率仅在“良好”信道上分布。 由于仅使用NS最佳通道并将每个所选信道的接收SNR与所选择的编码和调制方案所需的SNR相匹配的优点，可以实现改进的性能。

公开(公告)号：US07991040B2

公开(公告)日：2011-08-02

申请号：US11519256

申请日：2006-09-11

申请人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

发明人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

IPC分类号： H04B1/00

CPC分类号： H04L27/2614 ,  H04L27/2615

摘要： Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal. In an aspect, a method is provided for reducing a peak to average ratio of a transmit waveform. The method includes obtaining a primary scrambler sequence, generating a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining the primary and secondary scrambler sequences to produce a PAR reduction sequence. In another aspect, an apparatus is provided for reducing a peak to average ratio of a transmit waveform. The apparatus includes a secondary generator configured to generate a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining logic configured to combine a primary scrambler sequence and the secondary scrambler sequences to produce a PAR reduction sequence.

摘要翻译： 降低OFDM发射信号的峰均比的方法和装置。 在一方面，提供了一种降低发射波形的峰均比的方法。 该方法包括：获得主加扰器序列，产生具有基于要加扰的数据的长度特性的次扰频序列，以及组合所述主加扰序列和次加扰序列以产生PAR减少序列。 在另一方面，提供一种用于减小发射波形的峰均比的装置。 该装置包括辅助发生器，其被配置为产生具有基于要加扰的数据的长度特性的二次扰频器序列，以及被配置为组合主加扰器序列和次加扰器序列以产生PAR减少序列的组合逻辑。

公开(公告)号：US07949060B2

公开(公告)日：2011-05-24

申请号：US12554608

申请日：2009-09-04

申请人： Fuyun Ling ,  Jay R. Walton ,  Steven J. Howard ,  Mark Wallace ,  John W. Ketchum

发明人： Fuyun Ling ,  Jay R. Walton ,  Steven J. Howard ,  Mark Wallace ,  John W. Ketchum

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04B7/0417 ,  H04B7/0626 ,  H04B7/0632 ,  H04B7/0854 ,  H04B7/0891 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/006 ,  H04L5/0091 ,  H04L25/0204 ,  H04L25/021 ,  H04L25/0228 ,  H04L25/0244 ,  H04L25/0248 ,  H04L25/03159 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Techniques for transmitting data from a transmitter unit to a receiver unit in a multiple-input multiple-output (MIMO) communication system. In one method, at the receiver unit, a number of signals are received via a number of receive antennas, with the received signal from each receive antenna comprising a combination of one or more signals transmitted from the transmitter unit. The received signals are processed to derive channel state information (CSI) indicative of characteristics of a number of transmission channels used for data transmission. The CSI is transmitted back to the transmitter unit. At the transmitter unit, the CSI from the receiver unit is received and data for transmission to the receiver unit is processed based on the received CSI.

摘要翻译： 用于在多输入多输出（MIMO）通信系统中将数据从发射机单元传输到接收机单元的技术。 在一种方法中，在接收机单元处，经由多个接收天线接收多个信号，其中来自每个接收天线的接收信号包括从发射机单元发送的一个或多个信号的组合。 处理所接收的信号以导出指示用于数据传输的多个传输信道的特性的信道状态信息（CSI）。 CSI被发回到发射机单元。 在发射机单元处，接收来自接收机单元的CSI，并根据所接收到的CSI处理用于传输到接收机单元的数据。

公开(公告)号：US20110051618A1

公开(公告)日：2011-03-03

申请号：US12939118

申请日：2010-11-03

申请人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kirna Mukkavilli

发明人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kirna Mukkavilli

IPC分类号： H04W24/00 ,  H04L27/28

CPC分类号： H04L25/0232 ,  H04L25/022

摘要： Time filtering channel estimates in a wireless communication system, such as an Orthogonal Frequency Division Multiplex (OFDM) system, can be used to improve the quality of channel estimates. The characteristics of an optimal channel estimate time filter can depend on the manner in which the channel estimate is determined as well as the time correlation of channel estimates. A receiver can implement an adaptive time filter for channel estimates in which the time filter response can vary based on channel estimate parameters. The channel estimate parameters can include the manner of determining channel estimates, a time correlation of channel estimates, and an estimated Doppler frequency. The time filter response can be varied continuously over a range of responses or can be varied discretely over a predetermined number of time filter responses.

摘要翻译： 在诸如正交频分复用（OFDM）系统的无线通信系统中的时间滤波信道估计可以用于提高信道估计的质量。 最优信道估计时间滤波器的特征可以取决于信道估计的方式以及信道估计的时间相关性。 接收机可以实现用于信道估计的自适应时间滤波器，其中时间滤波器响应可以基于信道估计参数而变化。 信道估计参数可以包括确定信道估计的方式，信道估计的时间相关性和估计的多普勒频率。 时间滤波器响应可以在响应范围内连续变化，或者可以在预定数量的时间滤波器响应上离散变化。

公开(公告)号：US07881245B2

公开(公告)日：2011-02-01

申请号：US12506055

申请日：2009-07-20

申请人： Rajiv Vijayan ,  Fuyun Ling ,  Gordon Kent Walker ,  Ramaaswamy Murali ,  Ashok Mantravadi ,  Anand Subramaniam ,  Krishnamurthy Viswanathan, legal representative

发明人： Rajiv Vijayan ,  Fuyun Ling ,  Gordon Kent Walker ,  Ramaaswamy Murali ,  Ashok Mantravadi ,  Anand Subramaniam

IPC分类号： H04H20/71

CPC分类号： H04L5/0041 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L12/189 ,  H04W72/005

摘要： To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.

摘要翻译： 为了在无线广播网络中广播具有不同层次的不同类型的传输，每个基站根据第一模式（或编码和调制方案）处理广域传输的数据，以产生广域的数据符号 根据第二模式传输和处理用于本地传输的数据，以产生用于本地传输的数据符号。 分别基于广域和本地传输的期望覆盖来选择第一和第二模式。 基站还为本地和广域传输生成导频和开销信息。 用于本地和广域传输的数据，导频和开销信息被复用到它们的传输跨度，其可以是不同组的频率子带，不同时间段或不同时间段中的不同子带组。 多于两种不同类型的传输也可以被复用和广播。

公开(公告)号：US20110002413A1

公开(公告)日：2011-01-06

申请号：US12496473

申请日：2009-07-01

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： H04L27/00

CPC分类号： H04L5/0053 ,  H04L5/0073

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：US20100265865A9

公开(公告)日：2010-10-21

申请号：US11751631

申请日：2007-05-21

申请人： Rajiv Vijayan ,  Aamod Khandekar ,  Fuyun Ling ,  Gordon Kent Walker ,  Ramaswamy Murali

发明人： Rajiv Vijayan ,  Aamod Khandekar ,  Fuyun Ling ,  Gordon Kent Walker ,  Ramaswamy Murali

IPC分类号： H04J3/24

CPC分类号： H04W52/0209 ,  H04B7/12 ,  H04L1/0057 ,  H04L1/0065 ,  H04L1/0071 ,  H04L1/0083 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/06 ,  H04L25/0224 ,  H04L27/2602 ,  H04N21/2383 ,  H04N21/4382 ,  H04N21/6112 ,  H04W4/06 ,  H04W28/06 ,  H04W72/04 ,  Y02D70/166 ,  Y02D70/168 ,  Y02D70/442

摘要： Techniques for multiplexing and transmitting multiple data streams are described. Transmission of the multiple data streams occurs in “super-frames”. Each super-frame has a predetermined time duration and is further divided into multiple (e.g., four) frames. Each data block for each data stream is outer encoded to generate a corresponding code block. Each code block is partitioned into multiple subblocks, and each data packet in each code block is inner encoded and modulated to generate modulation symbols for the packet. The multiple subblocks for each code block are transmitted in the multiple frames of the same super-frame, one subblock per frame. Each data stream is allocated a number of transmission units in each super-frame and is assigned specific transmission units to achieve efficient packing. A wireless device can select and receive individual data streams.

摘要翻译： 描述用于复用和传输多个数据流的技术。 多个数据流的传输发生在“超帧”中。 每个超帧具有预定的持续时间并进一步分为多个（例如，四个）帧。 每个数据流的每个数据块被外部编码以生成相应的代码块。 每个码块被划分成多个子块，并且每个码块中的每个数据分组被内部编码和调制以产生分组的调制符号。 每个码块的多个子块在相同超帧的多个帧中传送，每帧一个子块。 每个数据流在每个超帧中被分配多个传输单元，并被分配特定的传输单元以实现有效的打包。 无线设备可以选择和接收各个数据流。

公开(公告)号：US20100251069A1

公开(公告)日：2010-09-30

申请号：US12750305

申请日：2010-03-30

申请人： Thomas Sun ,  Jing Jiang ,  Xinmiao Zhang ,  Fuyun Ling

发明人： Thomas Sun ,  Jing Jiang ,  Xinmiao Zhang ,  Fuyun Ling

IPC分类号： H03M13/05 ,  G06F11/10

CPC分类号： H04L1/0045

摘要： A method and apparatus for memory allocation for turbo decoder input with a long turbo codeword, the method comprising computing a bit level log likelihood ratio (LLR) of a demodulated signal over a superframe to generate at least one systematic bit LLR and at least one parity bit LLR; storing the at least one systematic bit LLR and the at least one parity bit LLR over the superframe in a decoder memory; and reading the systematic bit LLR and the parity bit LLR over the superframe to decode at least one codeword from the decoder memory.

摘要翻译： 一种用于具有长turbo码字的turbo解码器输入的存储器分配的方法和装置，所述方法包括在超帧上计算解调信号的比特电平对数似然比（LLR）以生成至少一个系统比特LLR和至少一个奇偶校验 位LLR; 将所述至少一个系统位LLR和所述至少一个奇偶校验位LLR存储在解码器存储器中的所述超帧上; 以及通过超帧读取系统位LLR和奇偶校验位LLR，以解码来自解码器存储器的至少一个码字。

公开(公告)号：US20100165851A1

公开(公告)日：2010-07-01

申请号：US12722308

申请日：2010-03-11

申请人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

发明人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

IPC分类号： H04W4/00 ,  H04B17/00 ,  H04L12/26

CPC分类号： H04W48/16

摘要： Systems and methodologies are described that facilitate monitoring RF channels in a wireless communication environment to determine whether one or more channels comprise a forward-link-only (FLO) signal. A receiver can receive a first RF channel with a FLO signal and can monitor other RF channels for FLO signals. Upon a determination that a monitored RF channel comprises a FLO signal, the receiver can switch between the first RF channel and the monitored RF channel to facilitate providing seamless reception of the FLO signal, which can be superframe synchronized between RF channels. FLO signal detection can be performed using one or more of a wide-area identification channel energy detection protocol and a wide-area overhead information symbol decoding error detection protocol.

摘要翻译： 描述了便于在无线通信环境中监视RF信道以确定一个或多个信道是包括仅前向链路（FLO）信号的系统和方法。 接收机可以接收具有FLO信号的第一RF信道，并且可以监视FLO信号的其他RF信道。 在确定被监视的RF信道包括FLO信号之后，接收机可以在第一RF信道和所监视的RF信道之间切换，以便于提供FLO信号的无缝接收，FLO信号可以在RF信道之间超帧同步。 可以使用广域识别信道能量检测协议和广域开销信息符号解码错误检测协议中的一个或多个来执行FLO信号检测。

公开(公告)号：US07724849B2

公开(公告)日：2010-05-25

申请号：US11516910

申请日：2006-09-06

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

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

IPC分类号： H03D1/04

CPC分类号： H04L1/20 ,  H04L27/2602 ,  H04L27/2647

摘要： 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.

摘要翻译： 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 。