公开(公告)号：US20070070877A1

公开(公告)日：2007-03-29

申请号：US11361088

申请日：2006-02-22

申请人： Thomas Sun ,  Durk Van Veen ,  Fuyun Ling ,  Murali Ramaswamy Chari

发明人： Thomas Sun ,  Durk Van Veen ,  Fuyun Ling ,  Murali Ramaswamy Chari

IPC分类号： H04J11/00

CPC分类号： H04L27/0012 ,  H04L25/0206 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2601 ,  H04L27/2647

摘要： Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. If the received modulation symbols are unknown during transmitter monitoring, it may be necessary to determine the modulation symbols for each subcarrier. The modulation types can be evaluated over a subset of subcarriers having a consistent modulation type, to reduce the possibility of an erroneous modulation type determination to an extremely low level. A metric can be generated for each modulation type that indicates the likelihood of a particular modulation type for the subset of subcarriers. The modulation type can be selected based upon the metric and modulation symbols consistent with the modulation type can be used for the subset of subcarriers.

摘要翻译： 描述了便于在无线通信环境中监视发射机性能的系统和方法。 如果在发射机监控期间接收到的调制符号是未知的，则可能需要确定每个子载波的调制符号。 调制类型可以在具有一致调制类型的子载波的子集上进行评估，以将错误调制类型确定的可能性降低到非常低的水平。 可以为指示子载波子集的特定调制类型的可能性的每种调制类型生成度量。 可以基于度量来选择调制类型，并且可以将与调制类型一致的调制符号用于子载波的子集。

公开(公告)号：US20060178755A1

公开(公告)日：2006-08-10

申请号：US11330652

申请日：2006-01-11

申请人： Fuyun Ling ,  Seong Chung ,  Jinxia Bai ,  Thomas Sun

发明人： Fuyun Ling ,  Seong Chung ,  Jinxia Bai ,  Thomas Sun

IPC分类号： G05B15/00

CPC分类号： H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

摘要： A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

摘要翻译： 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常被定义为k1≤2或k2≥2。 该方法选择k1 <2> 2和k2 <2>之间的不匹配能量比（k <2> 2），并为双层QPSK涡轮增益产生位LLR值 使用不匹配的k <2>能量比进行解码。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k <2>为约5.0625。 或者说，通过确定k1 <2> 2和k2 <2>之间的近似中点，所选择的不匹配的k 2 2能量比。

公开(公告)号：US20060109781A1

公开(公告)日：2006-05-25

申请号：US11192789

申请日：2005-07-29

申请人： Michael Wang ,  Fuyun Ling ,  Murali Chari ,  Rajiv Vijayan

发明人： Michael Wang ,  Fuyun Ling ,  Murali Chari ,  Rajiv Vijayan

IPC分类号： H04J11/00 ,  H04J13/00

CPC分类号： H04L1/0071 ,  H01R24/38 ,  H03M13/27 ,  H03M13/271 ,  H03M13/2757 ,  H03M13/276 ,  H03M13/2771 ,  H04L1/00 ,  H04L1/0041 ,  H04L1/0066 ,  H04L1/007 ,  H04L5/0007 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0083 ,  H04L25/0226 ,  H04L27/2607 ,  H04L27/261 ,  H04L27/2626 ,  H04L27/2656 ,  H04L27/2662

摘要： A system and method for frequency diversity uses interleaving. Subcarriers of an interlace are interleaved in a bit reversal fashion and the interlaces are interleaved in the bit reversal fashion.

摘要翻译： 用于频率分集的系统和方法使用交织。 交织的子载波以位反转的方式进行交织，并且以位反转方式交错交织。

公开(公告)号：US06967998B1

公开(公告)日：2005-11-22

申请号：US09438988

申请日：1999-11-12

申请人： Tao Chen ,  Fuyun Ling ,  Edward G. Tiedemann, Jr.

发明人： Tao Chen ,  Fuyun Ling ,  Edward G. Tiedemann, Jr.

IPC分类号： H04B7/26 ,  H04B17/00 ,  H04W28/04 ,  H04L1/20

CPC分类号： H04B17/327 ,  H04B17/309

摘要： In wireless communications, it is necessary to monitor the transmission quality of communications channels to maintain system performance and operation. The invention provides a way of measuring bit error rates in channels at the receiver, without diminishing channel throughput by inserting quality monitoring data into the signal at the transmitter.

摘要翻译： 在无线通信中，需要监控通信信道的传输质量，保持系统的性能和运行。 本发明提供了一种在接收机中测量信道中的比特错误率的方法，而不会通过将质量监视数据插入到发射机的信号中来减少信道吞吐量。

公开(公告)号：US06961388B2

公开(公告)日：2005-11-01

申请号：US09776073

申请日：2001-02-01

申请人： Fuyun Ling ,  Nagabhushana T. Sindhushayana ,  Jay R. Walton ,  Mark Wallace ,  Ivan Fernandez

发明人： Fuyun Ling ,  Nagabhushana T. Sindhushayana ,  Jay R. Walton ,  Mark Wallace ,  Ivan Fernandez

IPC分类号： H04J11/00 ,  H04B7/04 ,  H04J99/00 ,  H04L1/00 ,  H04L27/26 ,  H04B7/02 ,  H04L1/02

CPC分类号： H04B7/0417 ,  H04B7/0632 ,  H04L1/0009 ,  H04L1/0041 ,  H04L1/005 ,  H04L1/0055 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/0048 ,  H04L5/006 ,  H04L25/03171 ,  H04L27/3488

摘要： Coding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of “transmission channels” at different information bit rates based on the channels' achieved SNR. A base code is used in combination with common or variable puncturing to achieve different coding rates required by the transmission channels. The data (i.e., information bits) for a data transmission is encoded with the base code, and the coded bits for each channel (or group of channels with the similar transmission capabilities) are punctured to achieve the required coding rate. The coded bits may be interleaved (e.g., to combat fading and remove correlation between coded bits in each modulation symbol) prior to puncturing. The unpunctured coded bits are grouped into non-binary symbols and mapped to modulation symbols (e.g., using Gray mapping). The modulation symbol may be “pre-conditioned” and prior to transmission.

公开(公告)号：US20050163263A1

公开(公告)日：2005-07-28

申请号：US11021028

申请日：2004-12-22

申请人： Alok Gupta ,  Fuyun Ling

发明人： Alok Gupta ,  Fuyun Ling

IPC分类号： H04L27/06

CPC分类号： H04L27/2665 ,  H04L7/007 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2663 ,  H04L27/2675 ,  H04L27/2695

摘要： The disclosed embodiments provide for methods and systems for initial frequency acquisition in a wireless communication network. In one aspect, a method for initial frequency acquisition includes the acts of receiving a stream of input samples from a transmitter, determining an estimate for a frequency offset associated with the transmitter and the receiver based on the received input samples, and compensating for the frequency offset to achieve an initial frequency acquisition.

摘要翻译： 所公开的实施例提供了用于无线通信网络中的初始频率采集的方法和系统。 一方面，一种用于初始频率获取的方法包括从发射机接收输入样本流的动作，基于接收到的输入样本确定与发射机和接收机相关联的频率偏移的估计，并补偿频率 偏移以实现初始频率采集。

公开(公告)号：US06597922B1

公开(公告)日：2003-07-22

申请号：US09312262

申请日：1999-05-14

申请人： Fuyun Ling ,  Jack Holtzman ,  Charles E. Wheatley, III ,  Tao Chen ,  Edward G. Tiedemann ,  Gilbert Leung

发明人： Fuyun Ling ,  Jack Holtzman ,  Charles E. Wheatley, III ,  Tao Chen ,  Edward G. Tiedemann ,  Gilbert Leung

IPC分类号： H04B700

CPC分类号： H04W52/225 ,  H04W36/0094 ,  H04W52/40 ,  H04W52/42

摘要： A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.

摘要翻译： 一种用于在码分多址通信系统中发起切换的有效候选频率​​搜索的方法和装置。 该方法包括当导频信号由被功率控制到目标接收电平的移动台发送时，业务信道功率电平相对于导频信道增加，以提高接收机性能。 改进的特征是在基站处接收到的接收到的导频保持相同，而接收机在接收到的冗余业务符号中接收到额外的能量以增强正确解码接收帧的概率。 基站从感兴趣的频率检测到不存在移动台发送的信号。 如果基站知道不存在的起始时间和持续时间，则可以在该预定时间段内集中其检测。 如果没有信号在帧边界的两个帧上扩展，则可以提高性能。

公开(公告)号：US06522683B1

公开(公告)日：2003-02-18

申请号：US09636008

申请日：2000-08-10

申请人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

发明人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

IPC分类号： H04B169

CPC分类号： H04B1/7097 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03477

摘要： A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.

公开(公告)号：US06498805B1

公开(公告)日：2002-12-24

申请号：US09433814

申请日：1999-11-03

申请人： Tyler Brown ,  Michael Mao Wang ,  Fuyun Ling

发明人： Tyler Brown ,  Michael Mao Wang ,  Fuyun Ling

IPC分类号： H04B169

CPC分类号： H04L1/0071 ,  H04B2201/70701 ,  H04L1/0055 ,  H04L25/067 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0087

摘要： An apparatus and method provides channel phase compensation for a digital radio frequency RF channel, by analyzing a demodulated signal (24) communicated over the digital RF channel and generates data representing an estimate of a channel phase (28), based on channel symbol reliability data (242) generated for at least one channel symbol received over the RF channel. The apparatus and method iteratively generates channel symbol reliability data (242) for a same symbol until a frame containing the symbol is determined to either pass a frame error threshold or until a predetermined number of iterations of channel phase estimates for a symbol is detected.

摘要翻译： 一种装置和方法，通过分析通过数字RF信道传送的解调信号（24）并基于信道符号可靠性数据产生表示信道相位估计（28）的数据，为数字射频RF信道提供信道相位补偿 （242），用于通过RF信道接收的至少一个信道符号生成。 该装置和方法迭代地产生用于相同符号的信道符号可靠性数据（242），直到包含符号的帧被确定为通过帧错误阈值或者直到检测到符号的信道相位估计的预定次数为止。

公开(公告)号：US06466558B1

公开(公告)日：2002-10-15

申请号：US09414125

申请日：1999-10-08

申请人： Fuyun Ling

发明人： Fuyun Ling

IPC分类号： H04Q700

CPC分类号： H04B1/7115 ,  H04B1/712 ,  H04B7/0854

摘要： An optimum combiner that reduces the amount of interference imposed upon a first base station by transmissions of other base stations within the same communication system. Two antennas are used to receive transmissions within a receiving station. A rake receiver is coupled to each antenna. By optimally combining the signals that are received by each independent finger of the rake receiver, interference that is correlated between a finger associated with the first antenna and a finger associated with the second antenna can be minimized with respect to the desired signal. Optimum combining requires determination of optimum combining coefficients. A max-ratio combining algorithm may be substituted for the optimal combining algorithm depending upon interference characteristics.

摘要翻译： 一种最佳组合器，其通过在同一通信系统内的其它基站的传输来减少对第一基站施加的干扰量。 两个天线用于在接收站内接收传输。 耙式接收器耦合到每个天线。 通过最佳地组合由瑞克接收机的每个独立手指接收到的信号，可以相对于期望的信号来最小化与第一天线相关联的手指与与第二天线相关联的手指之间相关的干扰。 最佳组合需要确定最佳组合系数。 最大比组合算法可以取决于干扰特性的最佳组合算法。