公开(公告)号：US20080181328A1

公开(公告)日：2008-07-31

申请号：US12010655

申请日：2008-01-28

Applicant: Haim Harel ,  Yingxue Li ,  Alexander Segalovitz

Inventor： Haim Harel ,  Yingxue Li ,  Alexander Segalovitz

IPC: H04B7/02 ,  H04L27/00 ,  H04B7/185 ,  H04B7/00

CPC classification number: H04W52/221 ,  H04B7/0623 ,  H04B7/0632 ,  H04W52/16 ,  H04W52/34 ,  H04W52/42

Abstract: Communication is performed for a first communication device having a set of antenna elements. A quality-indication signal is received from a second communication device (e.g., a basestation). A complex weighting is calculated based on the quality-indication signal. A pre-transmission signal is modified based on the complex weighting to produce a set of modified-pre-transmission signals. Each modified pre-transmission signal from the set of modified-pre-transmission signals is uniquely associated with an antenna element from the set of antenna elements. The set of modified-pre-transmission signals is sent from the set of antenna elements to produce a transmitted signal. The complex weighting is associated with a total power of the transmitted power and at least one from a phase rotation and a power ratio associated with each antenna element from the set of antenna elements. For example, in CDMA based systems, a fast feedback from the basestation—the power control indication—can be used by a subscriber communication device for this transmission diversity method in such a way that provides the desired signal quality at the basestation, without necessarily responding to fading nulls by mobile unit power output increase, but rather, by manipulating the weights of the mobile transmitter antenna array. Thus, a significant reduction in average and peak mobile power level is achieved, enhancing network capacity, battery life, and radiation hazards.

公开(公告)号：US07333421B2

公开(公告)日：2008-02-19

申请号：US11358618

申请日：2006-02-21

Applicant: Yingxue Li

Inventor： Yingxue Li

IPC: H04B7/02 ,  H04J11/00

CPC classification number: H04B7/02 ,  H04L1/0618 ,  H04L5/0025 ,  H04L5/0046 ,  H04L27/2626 ,  H04L27/2647

Abstract: A transmitter in an OFDM-MIMO wireless communication system uses multiple antennas to transmit each data stream. Before the coded binary bits are mapped into channel symbols, they are divided into two groups. One group is mapped to a channel symbol as in a conventional system. Another group of binary bits is used to generate a spatial mapping index. The spatial mapping index determines which antenna is to be used to transmit the channel symbol for each subcarrier. Effectively, information bits are jointly represented by a combination of a channel symbol and an antenna that transmits the channel symbol. Therefore, to achieve the same data rate, a smaller signal constellation is required. In addition, spatial diversity can be achieved which is similar to traditional switching diversity. The number of non-zero subcarriers is reduced by half on average, which results in a lower peak to average ratio than conventional OFDM systems.

Abstract translation: OFDM-MIMO无线通信系统中的发射机使用多个天线来传送每个数据流。 在将编码的二进制位映射到通道符号之前，将它们分成两组。 一个组被映射到一个通道符号，就像传统的系统一样。 另一组二进制位用于生成空间映射索引。 空间映射索引确定哪个天线将用于发送每个子载波的信道符号。 实际上，信息位由发送信道符号的信道符号和天线的组合共同表示。 因此，为了达到相同的数据速率，需要较小的信号星座。 此外，可以实现类似于传统交换分集的空间分集。 非零子载波的数量平均减少一半，这导致比传统OFDM系统更低的峰均比。

公开(公告)号：US07321636B2

公开(公告)日：2008-01-22

申请号：US10141342

申请日：2002-05-09

Applicant: Haim Harel ,  Yingxue Li ,  Alexander Segalovitz

Inventor： Haim Harel ,  Yingxue Li ,  Alexander Segalovitz

IPC: H04L27/00 ,  H04L1/02 ,  H04B1/02 ,  H04B7/00

CPC classification number: H04W52/221 ,  H04B7/0623 ,  H04B7/0632 ,  H04W52/16 ,  H04W52/34 ,  H04W52/42

Abstract: Communication is performed for a first communication device having a set of antenna elements. A quality-indication signal is received from a second communication device. A complex weighting is calculated based on the quality-indication signal. A pre-transmission signal is modified based on the complex weighting to produce a set of modified-pre-transmission signals. Each modified pre-transmission signal from the set of modified-pre-transmission signals is uniquely associated with an antenna element from the set of antenna elements. The set of modified-pre-transmission signals is sent from the set of antenna elements to produce a transmitted signal.

Abstract translation: 对具有一组天线元件的第一通信设备执行通信。 从第二通信设备接收质量指示信号。 基于质量指示信号计算复数加权。 基于复加权来修改预传输信号以产生一组经修改的预传输信号。 来自修改后的预传输信号的每个经修改的预发射信号与天线元件集合中的天线元件唯一地相关联。 经修改的预传输信号的集合从天线元件组发送以产生发射信号。

公开(公告)号：US20060203789A1

公开(公告)日：2006-09-14

申请号：US11302299

申请日：2005-12-13

Applicant: Ana Iacono ,  Arty Chandra ,  Inhyok Cha ,  John Chen ,  Yingxue Li ,  James Otto

Inventor： Ana Iacono ,  Arty Chandra ,  Inhyok Cha ,  John Chen ,  Yingxue Li ,  James Otto

IPC: H04Q7/24 ,  H04L12/66

CPC classification number: H04B7/0608 ,  H04W16/28 ,  H04W72/046

Abstract: An apparatus and a method for improving packet transmission and reducing latency in VoIP over WLAN using switched beam antennas having multiple directional antenna beams are disclosed. In an access point having a switched beam antenna, or other smart antenna system, the present invention extends the coverage area of an access point for authentication and association of a new WTRU, extends the access points coverage area during in session transmissions with a WTRU, and adjusts data rates. The method also controls Contention Period (CP)/Contention Free Period (CFP) timing amongst beams emanating from an access point having a switched beam antenna, or other smart antenna system. Fast diversity switching, frame level switching, lowered data rates, and scanning multiple directional antenna beams for the optimum transmission beam are disclosed to improve beam selection and packet transmission.

Abstract translation: 公开了一种使用具有多个定向天线波束的切换波束天线来改善分组传输并减少VoIP中的VoIP延迟的装置和方法。 在具有切换波束天线或其它智能天线系统的接入点中，本发明扩展用于新WTRU的认证和关联的接入点的覆盖区域，在与WTRU的会话传输期间扩展接入点覆盖区域， 并调整数据速率。 该方法还控制从具有切换波束天线或其他智能天线系统的接入点发出的波束之间的竞争周期（CP）/无竞争周期（CFP）定时。 公开了快速分集切换，帧级切换，降低数据速率和扫描用于最佳传输波束的多方向天线波束，以改善波束选择和分组传输。

公开(公告)号：US20060094418A1

公开(公告)日：2006-05-04

申请号：US10983292

申请日：2004-11-04

Applicant: Phil Chen ,  Yingxue Li

Inventor： Phil Chen ,  Yingxue Li

IPC: H04B1/00 ,  H04B15/00 ,  H04Q7/20

CPC classification number: H04L1/0001 ,  H04B7/0613 ,  H04L1/0026 ,  H04W52/54

Abstract: One or more quality indicators are established at a first communication device having antenna elements. The quality indicators indicate a quality of one or more communication links between the first communication device and one or more second communication devices. A modification is determined according to the quality indicators, where the modification describes at least one adjustment of one or more modulation features. A time boundary indicator indicating a boundary of a time period is received. At least some of a set of signals are modulated in accordance with the modification and in response to the time boundary indicator, where a signal is associated with an antenna element. The set of signals is sent from the antenna elements to yield a transmitted signal.

公开(公告)号：US07802171B2

公开(公告)日：2010-09-21

申请号：US11617013

申请日：2006-12-28

Applicant: Yingxue Li ,  Prabhakar R. Chitrapu

Inventor： Yingxue Li ,  Prabhakar R. Chitrapu

IPC: H03M13/03

CPC classification number: H04L1/0048 ,  H03M13/27 ,  H03M13/6362 ,  H04L1/005 ,  H04L1/0069 ,  H04L1/0071 ,  H04L1/06 ,  H04L5/0023 ,  H04L27/2626 ,  H04L27/2647

Abstract: A wireless communication method and system for performing bit-interleaved coded modulation and iterative decoding. The system includes a transmitter and a receiver. The transmitter encodes incoming bits to generate coded bits, punctures the coded bits in accordance with a predetermined puncturing pattern to generate surviving channel bits and stolen bits and interleaves the surviving bits into interleaved surviving bits. The interleaved surviving bits are mapped to channel symbols and the stolen bits are interleaved to generate interleaved stolen bits. At least one of a plurality of antennas is selected to transmit the channel symbols based on the value of the interleaved stolen bits. The receiver receives the transmitted channel symbols, estimates a posteriori probability for both the channel symbols and the stolen bits, and retrieves information of the stolen bits by determining the selected antenna used to transmit the channel symbols.

Abstract translation: 一种用于执行比特交织的编码调制和迭代解码的无线通信方法和系统。 该系统包括发射机和接收机。 发射机对输入比特进行编码以产生编码比特，根据预定的穿孔模式对编码比特进行打孔，以产生幸存的信道比特和被盗的比特，并将幸存的比特交织到交织的幸存比特中。 交织的存活比特被映射到信道符号，并且被窃取的比特被交织以产生交织的被盗的比特。 选择多个天线中的至少一个基于交织的被盗比特的值来发送信道符号。 接收机接收所发送的信道符号，估计信道符号和被盗的比特的后验概率，并且通过确定用于发送信道符号的所选择的天线来检索被盗的比特的信息。

公开(公告)号：US07697626B2

公开(公告)日：2010-04-13

申请号：US11377152

申请日：2006-03-16

Applicant: Jin Wang ,  Arty Chandra ,  Inhyok Cha ,  Yingxue Li

Inventor： Jin Wang ,  Arty Chandra ,  Inhyok Cha ,  Yingxue Li

IPC: H04L1/02

CPC classification number: H04B7/0695 ,  H04B7/088 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0025

Abstract: A method and apparatus for selecting a beam combination of beam switched antennas in a multiple-input multiple-output (MIMO) wireless communication system including a first node and a second node. The first node sends a plurality of modulation and coding scheme (MCS) requests to the second node. Each of the plurality of MCS requests is sent using a particular beam combination. The second node receives the MCS requests and generates MCS feedback signals for each of the MCS requests. Each MCS feedback signal includes an MCS recommendation for the particular beam. The first node selects a beam combination for communicating with the second node based on the MCS recommendations.

Abstract translation: 一种用于在包括第一节点和第二节点的多输入多输出（MIMO）无线通信系统中选择波束切换天线的波束组合的方法和装置。 第一节点向第二节点发送多个调制和编码方案（MCS）请求。 使用特定的波束组合发送多个MCS请求中的每一个。 第二节点接收MCS请求，并为每个MCS请求生成MCS反馈信号。 每个MCS反馈信号包括针对特定波束的MCS推荐。 第一节点基于MCS建议选择用于与第二节点进行通信的波束组合。

公开(公告)号：US07558335B2

公开(公告)日：2009-07-07

申请号：US11345732

申请日：2006-02-02

Applicant: Yingxue Li

Inventor： Yingxue Li

IPC: H04L27/12

CPC classification number: H04L1/02 ,  H04B7/061

Abstract: A wireless communication system includes a transmitter comprising a serial-to-parallel converter for converting serial data bits to a parallel bit stream, a signal mapper coupled to the serial-to-parallel converter and an antenna selector coupled to the serial-to-parallel converter. The signal mapper receives as input a first group of bits from the parallel bit stream, and maps the first group of bits to a channel symbol. The antenna selector receives as input a second group of bits from the parallel bit stream. A transmit antenna array is coupled to the antenna selector and to the signal mapper. The transmit antenna array generates a plurality of transmit antenna patterns with one of the transmit antenna patterns being selected for transmitting the channel symbol based upon the second group of bits from the antenna selector.

Abstract translation: 无线通信系统包括发射机，包括用于将串行数据比特转换为并行比特流的串行到并行转换器，耦合到串行到并行转换器的信号映射器和耦合到串行到并行转换器的天线选择器 转换器。 信号映射器从并行位流接收作为输入的第一组位，并将第一组位映射到通道符号。 天线选择器从并行比特流接收第二组比特作为输入。 发射天线阵列耦合到天线选择器和信号映射器。 发射天线阵列产生多个发射天线模式，其中选择一个发射天线模式用于基于来自天线选择器的第二组比特发送信道符号。

公开(公告)号：US20080260058A1

公开(公告)日：2008-10-23

申请号：US12106068

申请日：2008-04-18

Applicant: Yingxue Li

Inventor： Yingxue Li

IPC: H04K1/10

CPC classification number: H04L25/03343 ,  H04B7/0417 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/0654 ,  H04L27/261 ,  H04L2025/03426

Abstract: A method and apparatus for precoding validation in wireless communications with reduced error probability is disclosed. Error probability is reduced by applying phase rotations to precoding matrices, dedicated pilot symbols, or both to maximize a minimum pairwise distance.

Abstract translation: 公开了一种用于在具有降低的错误概率的无线通信中预编码验证的方法和装置。 通过将相位旋转应用于预编码矩阵，专用导频符号或两者来减小最大化最小成对距离的误差概率。

公开(公告)号：US20080069281A1

公开(公告)日：2008-03-20

申请号：US11834984

申请日：2007-08-07

Applicant: Robert Olesen ,  Yingxue Li

Inventor： Robert Olesen ,  Yingxue Li

IPC: H04L1/02

CPC classification number: H04B7/065 ,  H04B7/0417 ,  H04B7/0634

Abstract: The present invention comprises a method of statistical feedback for Multiple In-Multiple Out (MIMO) transmit beamforming comprising combining a short term channel state information and long term statistics in deriving a precoding matrix. At least one measurable parameter is observed, and a forgetting factor is determined based upon the observed parameter.

Abstract translation: 本发明包括一种用于多输入多输出（MIMO）发射波束成形的统计反馈的方法，其包括在导出预编码矩阵时组合短期信道状态信息和长期统计。 观察到至少一个可测量的参数，并且基于观察到的参数确定遗忘因子。