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    Channel and interference estimation in single-carrier and multi-carrier frequency division multiple access systems
    81.
    发明授权
    Channel and interference estimation in single-carrier and multi-carrier frequency division multiple access systems 失效
    单载波和多载波频分多址系统中的信道和干扰估计

    公开(公告)号：US08331216B2

    公开(公告)日：2012-12-11

    申请号：US11332604

    申请日：2006-01-12

    申请人： Ravi Palanki ,  Aamod Khandekar

    发明人： Ravi Palanki ,  Aamod Khandekar

    IPC分类号： H04J11/00 ,  H04W36/00 ,  H04B7/00 ,  H04K1/10

    CPC分类号： H04L25/022 ,  H04B7/12 ,  H04L5/023 ,  H04L25/0232 ,  H04L27/2613 ,  H04L27/2647

    摘要： In a single-carrier frequency division multiple access (SC-FDMA) system, a receiver receives transmission symbols from a transmitter, determines a set of subbands used by the transmitter, processes the received transmission symbols for the set of subbands, obtains received pilot values for a transmitted pilot, and obtains received data values for transmitted data. The receiver may iteratively perform channel and interference estimation for the transmitter. The receiver selects an initial interference estimate, derives a channel estimate based on the received pilot values and the interference estimate, and derives a new interference estimate based on the received pilot values and the channel estimate. The receiver may repeat the derivation of the channel estimate and the interference estimate for multiple iterations. The receiver then performs data detection and/or receiver spatial processing on the received data values based on the channel estimate and the interference estimate.

    摘要翻译： 在单载波频分多址（SC-FDMA）系统中，接收机从发射机接收发射符号，确定发射机使用的一组子带，处理该子带组的接收的传输符号，获得接收到的导频值 并且获得用于发送数据的接收数据值。 接收机可以迭代地执行发射机的信道和干扰估计。 接收机选择初始干扰估计，基于接收的导频值和干扰估计导出信道估计，并且基于接收的导频值和信道估计导出新的干扰估计。 接收机可以重复导出信道估计和多次迭代的干扰估计。 接收机然后基于信道估计和干扰估计对所接收的数据值执行数据检测和/或接收机空间处理。

    METHODS AND APPARATUS FOR MEASURING, COMMUNICATING AND/OR USING INTERFERENCE INFORMATION
    84.
    发明申请
    METHODS AND APPARATUS FOR MEASURING, COMMUNICATING AND/OR USING INTERFERENCE INFORMATION 有权
    用于测量，通信和/或使用干扰信息的方法和装置

    公开(公告)号：US20110019770A1

    公开(公告)日：2011-01-27

    申请号：US12892578

    申请日：2010-09-28

    申请人： Alexei Yurievitch Gorokhov ,  Aamod Khandekar ,  Ravi Palanki ,  Rajat Prakash

    发明人： Alexei Yurievitch Gorokhov ,  Aamod Khandekar ,  Ravi Palanki ,  Rajat Prakash

    IPC分类号： H04L25/49

    CPC分类号： H04L27/2613 ,  H04B17/24 ,  H04B17/345 ,  H04B17/382 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0091 ,  H04W16/14 ,  H04W52/08 ,  H04W52/24 ,  H04W52/243 ,  H04W52/247 ,  H04W72/082

    摘要： Wireless communications methods and apparatus are described. A communications apparatus, e.g., a base station, measures interference information, e.g., other sector interference information. The communications apparatus generates a preamble which includes a plurality of pilot symbols and at least one of the pilot symbols includes interference information. In some embodiments, the preamble is part of a superframe structure, e.g., a recurring superframe structure, including the preamble and a plurality of frames, at least some of the frames used to convey traffic data. The communications apparatus transmits the preamble, thus broadcasting the interference information to access terminals in the vicinity. An access terminal receives the preamble including a plurality of pilot signals, at least one of the pilot signals including interference information. The access terminal recovers the interference information from the received preamble and controls signal transmission based on the recovered interference information.

    摘要翻译： 描述了无线通信方法和装置。 通信装置，例如基站，测量干扰信息，例如其他扇区干扰信息。 通信装置生成包括多个导频符号的前导码，并且导频符号中的至少一个包括干扰信息。 在一些实施例中，前导码是超帧结构的一部分，例如，包括前导码和多个帧的循环超帧结构，用于传送业务数据的至少一些帧。 通信装置发送前导码，从而将干扰信息广播到附近的接入终端。 接入终端接收包括多个导频信号的前导码，所述导频信号中的至少一个包括干扰信息。 接入终端从接收到的前导码中恢复干扰信息，并根据恢复的干扰信息控制信号传输。

    Pruned bit-reversal interleaver
    85.
    发明授权
    Pruned bit-reversal interleaver 有权
    修剪的位反转交织器

    公开(公告)号：US07543197B2

    公开(公告)日：2009-06-02

    申请号：US11022485

    申请日：2004-12-22

    申请人： Ravi Palanki ,  Aamod Khandekar

    发明人： Ravi Palanki ,  Aamod Khandekar

    IPC分类号： G06F11/00 ,  H03M13/03

    CPC分类号： H03M13/2789 ,  H03M13/2757 ,  H03M13/276

    摘要： A pruned bit-reversal interleaver supports different packet sizes and variable code rates and provides good spreading and puncturing properties. To interleave data, a packet of input data of a first size is received. The packet is extended to a second size that is a power of two, e.g., by appending padding or properly generating write addresses. The extended packet is interleaved in accordance with a bit-reversal interleaver of the second size, which reorders the bits in the extended packet based on their indices. A packet of interleaved data is formed by pruning the output of the bit-reversal interleaver, e.g., by removing the padding or properly generating read addresses. The pruned bit-reversal interleaver may be used in combination with various types of FEC codes such as a Turbo code, a convolutional code, or a low density parity check (LDPC) code.

    摘要翻译： 修剪的位反转交错器支持不同的分组大小和可变代码率，并提供良好的扩展和打孔属性。 为了交织数据，接收到第一大小的输入数据的分组。 例如，通过附加填充或适当地生成写入地址，将分组扩展到二次幂的第二大小。 扩展分组根据第二大小的位反转交织器进行交织，根据它们的索引对扩展分组中的比特进行重新排序。 通过例如通过去除填充或适当地生成读取地址来修剪比特反转交织器的输出来形成交织数据的分组。 修剪的位反转交织器可以与诸如Turbo码，卷积码或低密度奇偶校验（LDPC）码的各种类型的FEC码组合使用。

    PERSISTENT INTERFERENCE MITIGATION IN A WIRELESS COMMUNICATION SYSTEM
    86.
    发明申请
    PERSISTENT INTERFERENCE MITIGATION IN A WIRELESS COMMUNICATION SYSTEM 有权
    无线通信系统中的干扰干扰减轻

    公开(公告)号：US20090130980A1

    公开(公告)日：2009-05-21

    申请号：US12262576

    申请日：2008-10-31

    申请人： Ravi Palanki ,  Aamod Khandekar ,  Naga Bhushan

    发明人： Ravi Palanki ,  Aamod Khandekar ,  Naga Bhushan

    IPC分类号： H04B1/00 ,  H04B7/00

    CPC分类号： H04W74/0816 ,  H04B7/0617 ,  H04L5/0048 ,  H04W52/241 ,  H04W52/325 ,  H04W72/0426 ,  H04W72/046 ,  H04W72/08 ,  H04W72/082 ,  H04W72/14 ,  H04W88/02 ,  H04W88/08

    摘要： Techniques for transmitting data with persistent interference mitigation in a wireless communication system are described. A station (e.g., a base station or a terminal) may observe high interference and may send a request to reduce interference to interfering stations. The request may be valid for a time period covering multiple response periods. Each interfering station may grant or dismiss the request in each response period, may dismiss the request by transmitting at full power, and may grant the request by transmitting at lower than full power. The station may receive a response from each interfering station indicating grant or dismissal of the request by that interfering station in each response period. The station may estimate SINR based on the response received from each interfering station and may exchange data with another station based on the estimated SINR. Persistent interference mitigation may reduce signaling overhead and improve resource utilization and performance.

    摘要翻译： 描述了在无线通信系统中传输具有持续干扰减轻的数据的技术。 站（例如，基站或终端）可以观察到高干扰，并且可以发送减少对干扰站的干扰的请求。 该请求可以在覆盖多个响应周期的时间段内有效。 每个干扰站可以在每个响应周期中授权或者解除请求，可以通过全功率发射来解除请求，并且可以以低于全功率的方式发送请求。 站点可以从每个干扰站接收指示在每个响应周期中该干扰站的请求的授权或解除的响应。 该站可以基于从每个干扰站接收到的响应估计SINR，并且可以基于估计的SINR与另一个站交换数据。 持续的干扰减轻可以减少信令开销并提高资源利用率和性能。

    WIRELESS COMMUNICATION CHANNEL BLANKING
    87.
    发明申请
    WIRELESS COMMUNICATION CHANNEL BLANKING 有权
    无线通信通道空白

    公开(公告)号：US20090130979A1

    公开(公告)日：2009-05-21

    申请号：US12163835

    申请日：2008-06-27

    申请人： Naga Bhushan ,  Aamod Khandekar ,  Ravi Palanki

    发明人： Naga Bhushan ,  Aamod Khandekar ,  Ravi Palanki

    IPC分类号： H04B15/00

    CPC分类号： H04W52/243 ,  H04W52/325 ,  H04W52/38 ,  H04W52/44

    摘要： Systems and methodologies are described that facilitate blanking on portions of bandwidth utilized by communicating devices that are dominantly interfered by a disparate device in wireless communications networks. The portions of bandwidth can relate to critical data, such as control data, and one or more of the communicating devices can request that the dominantly interfering device blank on one or more of the portions. The communicating devices can subsequently transmit data over the blanked portions free of the dominant interference. Additionally, the dominantly interfering device can request reciprocal blanking from the one or more communicating devices.

    摘要翻译： 描述了系统和方法，其有助于消除由无线通信网络中的不同设备主要干扰的通信设备所使用的带宽部分的消隐。 带宽的部分可以与诸如控制数据的关键数据相关联，并且一个或多个通信设备可以请求在一个或多个部分上的主要干扰设备空白。 通信设备可以随后在没有主导干扰的消隐部分上发送数据。 此外，主要干扰装置可以从一个或多个通信装置请求相互消隐。

    CENTER FREQUENCY CONTROL FOR WIRELESS COMMUNICATION
    88.
    发明申请
    CENTER FREQUENCY CONTROL FOR WIRELESS COMMUNICATION 失效
    无线通信中心频率控制

    公开(公告)号：US20090093216A1

    公开(公告)日：2009-04-09

    申请号：US12238832

    申请日：2008-09-26

    申请人： Jing Sun ,  Aamod Khandekar ,  Ravi Palanki

    发明人： Jing Sun ,  Aamod Khandekar ,  Ravi Palanki

    IPC分类号： H04B17/00

    CPC分类号： H04L5/0007 ,  H04L5/0044 ,  H04W72/00

    摘要： The method and apparatus as described are directed toward techniques and mechanisms to improve efficient wireless network implementation, including obtaining one specification including a center frequency definition, determining, based on the specification, a center frequency of at least one carrier used to operate on the wireless communication system, determining an amount of dithering to add to the center frequency, and setting the center frequency to be multiples of sub-carrier spacing by adding the dithering.

    摘要翻译： 所描述的方法和装置涉及改进有效的无线网络实现的技术和机制，包括获得包括中心频率定义的一个规范，基于规范确定用于在无线网络上操作的至少一个载波的中心频率 通信系统，确定要添加到中心频率的抖动量，以及通过添加抖动将中心频率设置为副载波间隔的倍数。

    Code division multiplexing in a single-carrier frequency division multiple access system
    90.
    发明申请
    Code division multiplexing in a single-carrier frequency division multiple access system 有权
    在单载波频分多址系统中进行码分复用

    公开(公告)号：US20070041404A1

    公开(公告)日：2007-02-22

    申请号：US11431969

    申请日：2006-05-10

    申请人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

    发明人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

    IPC分类号： H04J13/00 ,  H04J1/00

    CPC分类号： H04W72/0406 ,  H04B1/692 ,  H04J1/00 ,  H04J11/00 ,  H04J13/10 ,  H04L5/0021 ,  H04L5/0026 ,  H04L5/0037 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/0242 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2615 ,  H04L27/2636 ,  H04L27/2643

    摘要： In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA (LFDMA), a transmitter generates modulation symbols for different types of data (e.g., traffic data, signaling, and pilot) and performs code division multiplexing (CDM) on at least one data type. For example, the transmitter may apply CDM on signaling and/or pilot sent on frequency subbands and symbol periods that are also used by at least one other transmitter. To apply CDM to a given data type (e.g., signaling), the transmitter performs spreading on the modulation symbols for that data type with an assigned spreading code. CDM may be applied across symbols, samples, samples and symbols, frequency subbands, and so on. The transmitter may perform scrambling after the spreading. The transmitter generates SC-FDMA symbols of the same or different symbol durations for traffic data, signaling, and pilot and transmits the SC-FDMA symbols.

    摘要翻译： 在采用交织FDMA（IFDMA）或局部FDMA（LFDMA）的单载波频分多址（SC-FDMA）系统中，发射机为不同类型的数据（例如业务数据，信令和导频）生成调制符号， 并对至少一种数据类型进行码分复用（CDM）。 例如，发射机可以在也被至少一个其他发射机使用的频率子带和符号周期上发送的信令和/或导频上应用CDM。 为了将CDM应用于给定数据类型（例如，信令），发射机对具有分配的扩展码的数据类型的调制符号执行扩展。 CDM可以跨符号，样本，样本和符号，频率子带等应用。 发射机可以在扩频之后执行加扰。 发射机产生业务数据，信令和导频的相同或不同符号持续时间的SC-FDMA符号，并发送SC-FDMA符号。