公开(公告)号：US08705370B2

公开(公告)日：2014-04-22

申请号：US12722308

申请日：2010-03-11

Applicant: Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

Inventor： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

IPC: H04W4/00

CPC classification number: H04W48/16

Abstract: 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.

Abstract translation: 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：US08655294B2

公开(公告)日：2014-02-18

申请号：US12787062

申请日：2010-05-25

Applicant: Gordon K. Walker ,  Murali R. Chari ,  Fuyun Ling

Inventor： Gordon K. Walker ,  Murali R. Chari ,  Fuyun Ling

IPC: H04B1/16

CPC classification number: H04L27/2688 ,  H04L1/20 ,  H04L25/0216 ,  H04L27/2665 ,  H04L27/2695

Abstract: Methods and circuits for positioning a signal sampling window within a wireless receiver device for use in a multi-transmitter wireless broadcast network include generating a long channel model based upon a signal identifying transmitters that can be processed without aliases, and positioning the signal sampling window based upon the long channel model. For example, in a MediaFLO® broadcast, the long channel model may be generated by receiving positioning pilot channel (PPC) signals. Positions for the signal sampling window may be determined by identifying hypothetical signal sampling window positions, calculating signal to interference and noise ratio (SINR) values for each identified hypothetical, and selecting the hypothetical with the best SINR. Using a long channel model to position the signal sampling window may provide improved window placement, reduce destructive aliasing, and reduce a time guard in the window placement. The long channel model may be used in conjunction with terrain databases.

Abstract translation: 用于在无线接收机设备内定位用于多发射机无线广播网络中的信号采样窗口的方法和电路包括基于识别可以在没有别名的情况下被处理的发射机的信号来生成长信道模型，并且基于信号采样窗口 在长渠道模式。 例如，在MediaFLO广播中，可以通过接收定位导频信道（PPC）信号来生成长信道模型。 信号采样窗口的位置可以通过识别假设信号采样窗口位置，为每个识别的假设计算信号与干扰和噪声比（SINR）值并选择具有最佳SINR的假设来确定。 使用长通道模型来定位信号采样窗口可以提供改进的窗口放置，减少破坏性混叠，并减少窗口位置中的时间守卫。 长通道模型可以与地形数据库结合使用。

公开(公告)号：US20130266097A1

公开(公告)日：2013-10-10

申请号：US13440287

申请日：2012-04-05

Applicant: Jinghu Chen ,  Wanlun Zhao ,  Mingxi Fan ,  Fuyun Ling ,  Peter John Black

Inventor： Jinghu Chen ,  Wanlun Zhao ,  Mingxi Fan ,  Fuyun Ling ,  Peter John Black

IPC: H04L27/06

CPC classification number: H03M13/2975 ,  H04L1/0051

Abstract: Certain embodiments provide methods that may allow for improvements in performance and power consumption by terminating the turbo decoding process early when one of at least two test criterion is satisfied in communications systems, including UMTS, WCDMA, and TD-DCMA.

Abstract translation: 某些实施例提供了通过在包括UMTS，WCDMA和TD-DCMA的通信系统中满足至少两个测试标准中的一个的情况下提前终止turbo解码过程来允许改进性能和功耗的方法。

公开(公告)号：US08477858B2

公开(公告)日：2013-07-02

申请号：US12713121

申请日：2010-02-25

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

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

IPC: H04K1/10

CPC classification number: 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

Abstract: 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.

公开(公告)号：US08428198B2

公开(公告)日：2013-04-23

申请号：US11376986

申请日：2006-03-15

Applicant: Bojan Vrcelj ,  Raghuraman Krishnamoorthi ,  Seong Taek Chung ,  Fuyun Ling

Inventor： Bojan Vrcelj ,  Raghuraman Krishnamoorthi ,  Seong Taek Chung ,  Fuyun Ling

IPC: H04L27/06

CPC classification number: H04L27/2657 ,  H04L27/2607 ,  H04L27/2665 ,  H04L27/2678 ,  H04L27/2695

Abstract: A frequency tracking method and apparatus is provided. A receiver receives OFDM symbols and determines associated frequency offset. A frequency error estimator selects a cross correlation window for determining frequency offset based on timing offset. A symbol timing estimator is used to determine the timing offset.

Abstract translation: 提供了一种频率跟踪方法和装置。 接收机接收OFDM符号并确定相关的频率偏移。 频率误差估计器基于定时偏移来选择用于确定频率偏移的互相关窗口。 使用符号定时估计器来确定定时偏移。

公开(公告)号：US20130003817A1

公开(公告)日：2013-01-03

申请号：US13171300

申请日：2011-06-28

Applicant: Fuyun Ling ,  Wanlun Zhao

Inventor： Fuyun Ling ,  Wanlun Zhao

IPC: H04L27/01

CPC classification number: H04L25/03159 ,  H04L2025/03382 ,  H04L2025/03547 ,  H04L2025/03624

Abstract: An improved receiver apparatus and algorithm for equalizing signals in a receiver device may equalize a block of data generated from N data symbols in a single carrier communication system. A first algorithm may be applied to a plurality of signal samples to generate a frequency domain representation of the samples. A channel estimate may be generated and a frequency response of a zero-forcing or a minimum-mean-square equalizer is applied. A conjugate of the computed frequency response is multiplied with a frequency domain representation for each sample to generate a product value. N-aliased frequency domain values from the generated product value may be determined for each of the samples. A second algorithm is applied to the generated N-aliased frequency domain values to generate estimates of the transmitted time domain data symbols.

Abstract translation: 用于对接收机设备中的信号进行均衡的改进的接收机设备和算法可以均衡在单个载波通信系统中从N个数据符号生成的数据块。 可以将第一算法应用于多个信号样本以产生样本的频域表示。 可以产生信道估计，并且应用迫零或均方均衡器的频率响应。 将所计算的频率响应的共轭与每个样本的频域表示相乘以产生乘积值。 可以为每个样本确定来自所生成的乘积值的N个混叠频域值。 将第二种算法应用于所生成的N个混叠频域值以产生传输的时域数据符号的估计。

公开(公告)号：US08249203B2

公开(公告)日：2012-08-21

申请号：US12235553

申请日：2008-09-22

Applicant: Thomas Sun ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Tao Tian ,  Bojan Vrcelj

Inventor： Thomas Sun ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Tao Tian ,  Bojan Vrcelj

IPC: H04B1/10

CPC classification number: H04L25/0212 ,  H04L25/0204 ,  H04L25/0216

Abstract: Methods and systems are described for processing a signal in wireless communications. The signal may have synchronization information. A method of processing a signal having synchronization information may include receiving the signal, and determining a truncation region of the time domain estimated channel, the estimated channel having taps. The method further includes processing the channel taps within the truncation region.

Abstract translation: 描述了用于处理无线通信中的信号的方法和系统。 该信号可以具有同步信息。 处理具有同步信息的信号的方法可以包括接收信号，以及确定时域估计信道的截断区域，估计信道具有抽头。 该方法还包括处理截断区域内的信道抽头。

公开(公告)号：US20110255622A1

公开(公告)日：2011-10-20

申请号：US13168849

申请日：2011-06-24

Applicant: Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

Inventor： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

IPC: H04J11/00

CPC classification number: H04L27/2614 ,  H04L27/2615

Abstract: 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.

Abstract translation: 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：US08009775B2

公开(公告)日：2011-08-30

申请号：US11372931

申请日：2006-03-09

Applicant: Vinay Murthy ,  Alok Kumar Gupta ,  Seong Taek Chung ,  Fuyun Ling

Inventor： Vinay Murthy ,  Alok Kumar Gupta ,  Seong Taek Chung ,  Fuyun Ling

IPC: H04L27/06 ,  H04L7/00 ,  H04L27/00

CPC classification number: G06F1/0353 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

Abstract: Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.

Abstract translation: 描述在OFDM系统中执行频率控制的技术。 在一个方面，基于接收到的导频执行频率采集，并且基于接收的OFDM符号执行频率跟踪。 对于频率获取，可以基于接收到的导频来导出初始频率误差估计，并且可以利用初始频率误差估计来初始化自动频率控制（AFC）循环。 对于频率跟踪，可以针对每个接收的OFDM符号导出频率误差估计，并且可以用频率误差估计来更新AFC循环。 通过具有初始频率误差估计的AFC回路以及每个接收的OFDM符号的频率误差估计来校正输入采样中的频率误差。 在另一方面，例如基于所接收的OFDM符号定时，选择接收的OFDM符号的可变数目的样本，以用于频率误差估计。

公开(公告)号：US20110188459A1

公开(公告)日：2011-08-04

申请号：US12699596

申请日：2010-02-03

Applicant: RAGHURAMAN KRISHNAMOORTHI ,  Gordon Kent Walker ,  Fuyun Ling

Inventor： RAGHURAMAN KRISHNAMOORTHI ,  Gordon Kent Walker ,  Fuyun Ling

IPC: H04W72/04

CPC classification number: H04N21/631 ,  H04N21/2383 ,  H04N21/2385 ,  H04N21/4382

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer readable storage media, for increasing utilization of transmission resources by mapping data from a block of layered codec data onto a plurality of logical channels for transmission of the mapped data. Resource utilization may also be improved by mapping data from at least two layers of a block of layered of codec data onto a logical channel that supports only a single data channel carried by a transmit modulation scheme.

Abstract translation: 方法，系统和装置，包括在计算机可读存储介质上编码的计算机程序，用于通过将来自分层编解码器数据块的数据映射到用于传输映射数据的多个逻辑信道上的数据来增加传输资源的利用。 也可以通过将来自编解码器数据分层的至少两层的数据映射到仅支持由发送调制方案承载的单个数据信道的逻辑信道上来提高资源利用。