公开(公告)号：US20090075664A1

公开(公告)日：2009-03-19

申请号：US12206528

申请日：2008-09-08

申请人： Ravi Palanki ,  Avneesh Agrawal ,  Aamod Khandekar

发明人： Ravi Palanki ,  Avneesh Agrawal ,  Aamod Khandekar

IPC分类号： H04W40/00

CPC分类号： H04L25/4902 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0053 ,  H04L27/2601

摘要： Techniques for transmitting information using beacon symbols are described. A transmitter may map first information to at least one subcarrier in a first set of subcarriers, with the first information being conveyed by the position of the at least one subcarrier. The transmitter may map second information to one or more subcarriers in a second set of subcarriers. The second information may be conveyed by one or more modulation symbols sent on the one or more subcarriers. The transmitter may generate at least one beacon symbol having the first information mapped to the at least one subcarrier in the first set and the second information mapped to the one or more subcarriers in the second set. In one design, the transmitter may frequency division multiplex the first information with the second information. In another design, the transmitter may puncture the second information on the at least one subcarrier with the first information.

摘要翻译： 描述了使用信标符号发送信息的技术。 发射机可以将第一信息映射到第一组子载波中的至少一个子载波，其中第一信息由至少一个子载波的位置传送。 发射机可以将第二信息映射到第二组子载波中的一个或多个子载波。 第二信息可以由在一个或多个子载波上发送的一个或多个调制符号传送。 发射机可以生成具有映射到第一组中的至少一个子载波的第一信息和映射到第二组中的一个或多个子载波的第二信息的至少一个信标符号。 在一种设计中，发射机可以将第一信息与第二信息进行频分复用。 在另一种设计中，发射机可以利用第一信息来对该至少一个子载波的第二信息进行穿孔。

公开(公告)号：US20070036179A1

公开(公告)日：2007-02-15

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： H04B3/10

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。

公开(公告)号：US20070014272A1

公开(公告)日：2007-01-18

申请号：US11242115

申请日：2005-09-30

申请人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

发明人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

IPC分类号： H04B7/208

CPC分类号： H04B7/04 ,  H04L1/1819 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0206 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/0256

摘要： In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA, multiple transmitters may transmit their pilots using time division multiplexing (TDM), code division multiplexing (CDM), interleaved frequency division multiplexing (IFDM), or localized frequency division multiplexing (LFDM). The pilots from these transmitters are then orthogonal to one another. A receiver performs the complementary demultiplexing for the pilots sent by the transmitters. The receiver may derive a channel estimate for each transmitter using an MMSE technique or a least-squares technique. The receiver may receive overlapping data transmissions sent on the same time-frequency block by the multiple transmitters and may perform receiver spatial processing with spatial filter matrices to separate these data transmissions. The receiver may derive the spatial filter matrices based on the channel estimates for the transmitters and using zero-forcing, MMSE, or maximal ratio combining technique.

摘要翻译： 在采用交织FDMA（IFDMA）或集中式FDMA的单载波频分多址（SC-FDMA）系统中，多个发射机可以使用时分多路复用（TDM），码分多路复用（CDM），交错分频 复用（IFDM）或局部频分复用（LFDM）。 来自这些发射机的飞行员然后彼此正交。 接收机对由发射机发送的导频进行互补解复用。 接收机可以使用MMSE技术或最小二乘法来为每个发射机导出信道估计。 接收机可以接收由多个发射机在相同时间频率块上发送的重叠数据传输，并且可以使用空间滤波器矩阵来执行接收机空间处理以分离这些数据传输。 接收机可以基于发射机的信道估计和使用零强制，MMSE或最大比组合技术导出空间滤波器矩阵。

公开(公告)号：US09419676B2

公开(公告)日：2016-08-16

申请号：US13366727

申请日：2012-02-06

申请人： Ravi Palanki ,  Aamod Khandekar

发明人： Ravi Palanki ,  Aamod Khandekar

IPC分类号： H04B1/69 ,  H04L27/26 ,  H04L5/00 ,  H04L25/02 ,  H04L25/03

CPC分类号： H04B1/69 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/023 ,  H04L25/025 ,  H04L27/2613 ,  H04L2025/03624

摘要： A receiver for receiving a pilot generated based on a polyphase sequence having a constant time-domain envelope and a flat frequency spectrum is disclosed. In one design, the receiver includes at least one demodulator and at least one processor. The demodulator(s) receive at least one single-carrier frequency division multiple access (SC-FDMA) symbol transmitted via a communication channel and including pilot symbols generated based on a polyphase sequence. The demodulator(s) remove a cyclic prefix in each SC-FDMA symbol and demodulate the at least one SC-FDMA symbol to obtain received pilot symbols. The processor(s) derive a channel estimate for the communication channel based on the received pilot symbols.

摘要翻译： 公开了一种用于接收基于具有恒定时域包络和平坦频谱的多相序列产生的导频的接收机。 在一种设计中，接收机包括至少一个解调器和至少一个处理器。 解调器接收经由通信信道发送并包括基于多相序列生成的导频符号的至少一个单载波频分多址（SC-FDMA）符号。 解调器在每个SC-FDMA符号中去除循环前缀，并解调至少一个SC-FDMA符号以获得接收到的导频符号。 处理器基于接收到的导频符号导出通信信道的信道估计。

公开(公告)号：US20160149659A1

公开(公告)日：2016-05-26

申请号：US15011088

申请日：2016-01-29

申请人： Ravi Palanki ,  Aamod Khandekar ,  Naga Bhushan

发明人： Ravi Palanki ,  Aamod Khandekar ,  Naga Bhushan

IPC分类号： H04J11/00 ,  H04W72/08 ,  H04L5/00

CPC分类号： H04J11/005 ,  H04B1/7107 ,  H04B2201/70702 ,  H04J11/004 ,  H04J11/0069 ,  H04L5/0048 ,  H04L5/0053 ,  H04W24/00 ,  H04W48/08 ,  H04W72/082

摘要： Techniques for transmitting and detecting for overhead channels and signals in a wireless network are described. In an aspect, a base station may blank (i.e., not transmit) at least one overhead transmission on certain resources in order to detect for the at least one overhead transmission of another base station. In one design, the base station may (i) send the overhead transmission(s) on a first subset of designated resources and (ii) blank the overhead transmission(s) on a second subset of the designated resources. The designated resources may be resources on which the overhead transmission(s) are sent by macro base stations. The base station may detect for the overhead transmission(s) from at least one other base station on the second subset of the designated resources. In another aspect, the base station may transmit the overhead transmission(s) on additional resources different from the designated resources.

公开(公告)号：US09326253B2

公开(公告)日：2016-04-26

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： H04W52/00 ,  H04W52/24 ,  H04W52/32 ,  H04W52/44 ,  H04W52/38

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。

公开(公告)号：US08730877B2

公开(公告)日：2014-05-20

申请号：US11242115

申请日：2005-09-30

申请人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

发明人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

IPC分类号： H04W4/00

CPC分类号： H04B7/04 ,  H04L1/1819 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0206 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/0256

摘要： In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA, multiple transmitters may transmit their pilots using time division multiplexing (TDM), code division multiplexing (CDM), interleaved frequency division multiplexing (IFDM), or localized frequency division multiplexing (LFDM). The pilots from these transmitters are then orthogonal to one another. A receiver performs the complementary demultiplexing for the pilots sent by the transmitters. The receiver may derive a channel estimate for each transmitter using an MMSE technique or a least-squares technique. The receiver may receive overlapping data transmissions sent on the same time-frequency block by the multiple transmitters and may perform receiver spatial processing with spatial filter matrices to separate these data transmissions. The receiver may derive the spatial filter matrices based on the channel estimates for the transmitters and using zero-forcing, MMSE, or maximal ratio combining technique.

摘要翻译： 在采用交织FDMA（IFDMA）或集中式FDMA的单载波频分多址（SC-FDMA）系统中，多个发射机可以使用时分多路复用（TDM），码分多路复用（CDM），交错分频 复用（IFDM）或局部频分复用（LFDM）。 来自这些发射机的飞行员然后彼此正交。 接收机对由发射机发送的导频进行互补解复用。 接收机可以使用MMSE技术或最小二乘法来为每个发射机导出信道估计。 接收机可以接收由多个发射机在相同时间频率块上发送的重叠数据传输，并且可以利用空间滤波器矩阵来执行接收机空间处理以分离这些数据传输。 接收机可以基于发射机的信道估计和使用零强制，MMSE或最大比组合技术导出空间滤波器矩阵。

公开(公告)号：US08098711B2

公开(公告)日：2012-01-17

申请号：US12947547

申请日：2010-11-16

申请人： Ravi Palanki ,  Aamod Khandekar

发明人： Ravi Palanki ,  Aamod Khandekar

IPC分类号： H04B1/00

CPC分类号： H04L5/0007 ,  H04B1/7143 ,  H04L5/0021 ,  H04L5/0048 ,  H04L9/0625 ,  H04L2209/08 ,  H04L2209/80

摘要： Techniques for efficiently designing random hopping patterns in a communications system are disclosed. The disclosed embodiments provide for methods and systems for generating random hopping patterns, updating the patterns frequently, generating different patterns for different cells/sectors, and generating patterns of nearby sub-carriers for block hopping.

公开(公告)号：US07974355B2

公开(公告)日：2011-07-05

申请号：US12091681

申请日：2006-10-27

申请人： Ravi Palanki ,  Aamod Khandekar

发明人： Ravi Palanki ,  Aamod Khandekar

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L5/0041 ,  H03M13/2725 ,  H03M13/276 ,  H03M13/2789 ,  H03M13/2957 ,  H04B1/7143 ,  H04J13/00 ,  H04L1/0003 ,  H04L1/0026 ,  H04L1/0625 ,  H04L5/0007 ,  H04L5/0026 ,  H04L5/005 ,  H04L25/0228 ,  H04L27/2602 ,  H04W52/54

摘要： A method and apparatus for generating a permutation for forward link hopping is provided, comprising initializing permutation constants, determining a value for p such that i is less than 2p wherein i is a first counter, initializing a second counter j to ‘0’, setting x to i+1 wherein x is index of elements of an array A, clocking a Pseudo-noise (PN) register n times to generate a pseudorandom number, setting x to p Least Significant Bits (LSB) of the pseudorandom number, incrementing j by 1, determining if x is greater than i, setting x equal to x−i, if x is greater than i, swapping the ith and xth element in the array A, decrementing counter i by 1, and mapping a set of hop-ports to a set of sub-carriers based upon the generated hop-permutation.

摘要翻译： 提供一种用于产生用于前向链路跳变的置换的方法和装置，包括初始化置换常数，确定p的值使得i小于2p，其中i是第一计数器，将第二计数器j初始化为“0” x到i + 1其中x是阵列A的元素的索引，对伪噪声（PN）寄存器进行n次计时以产生伪随机数，将x设置为p的最小有效位（LSB），递增j 通过1，确定x是否大于i，将x设置为x-i，如果x大于i，则将阵列A中的第i和第x个元素进行交换，将计数器i递减1，并将一组hop- 端口到基于所生成的跳位排列的一组子载波。

公开(公告)号：US20090327843A1

公开(公告)日：2009-12-31

申请号：US12489431

申请日：2009-06-23

申请人： Ravi Palanki ,  Aamod Khandekar

发明人： Ravi Palanki ,  Aamod Khandekar

IPC分类号： H03M13/27 ,  H03M13/05 ,  G06F11/10 ,  H03M13/23

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。