公开(公告)号：US08365047B2

公开(公告)日：2013-01-29

申请号：US13330999

申请日：2011-12-20

申请人： Ravi Palanki ,  Jeremy H. Lin ,  Aamod Khandekar ,  Alexei Gorokhov ,  Avneesh Agrawal

发明人： Ravi Palanki ,  Jeremy H. Lin ,  Aamod Khandekar ,  Alexei Gorokhov ,  Avneesh Agrawal

IPC分类号： H03M13/00

CPC分类号： H04L1/0007 ,  H04L1/0009 ,  H04L1/0021 ,  H04L1/0042 ,  H04L1/1812 ,  H04L1/1822

摘要： Techniques for encoding and decoding data are described. In an aspect, multiple code rates for a forward error correction (FEC) code may be supported, and a suitable code rate may be selected based on packet size. A transmitter may obtain at least one threshold to use for code rate selection, determine a packet size to use for data transmission, and select a code rate from among the multiple code rates based on the packet size and the at least one threshold. In another aspect, multiple FEC codes of different types (e.g., Turbo, LDPC, and convolutional codes) may be supported, and a suitable FEC code may be selected based on packet size. The transmitter may obtain at least one threshold to use for FEC code selection and may select an FEC code from among the multiple FEC codes based on the packet size and the at least one threshold.

公开(公告)号：US20120218943A1

公开(公告)日：2012-08-30

申请号：US13465943

申请日：2012-05-07

申请人： Aamod Khandekar ,  Alexei Gorokhov ,  Naga Bhushan ,  Sandip Sarkar ,  Ravi Palanki

发明人： Aamod Khandekar ,  Alexei Gorokhov ,  Naga Bhushan ,  Sandip Sarkar ,  Ravi Palanki

IPC分类号： H04W48/12

CPC分类号： H04W72/04 ,  H04B1/713 ,  H04B7/2621 ,  H04L1/1692 ,  H04L5/0053 ,  H04W52/146 ,  H04W52/16 ,  H04W52/243 ,  H04W52/247 ,  H04W52/362 ,  H04W52/60 ,  H04W72/08

摘要： Techniques for sending control information in a wireless communication system are described. A control segment may include L≧1 tiles, and each tile may include a number of transmission units. A number of control resources may be defined and mapped to the transmission units for the control segment. For symmetric mapping, multiple sets of S≧1 control resources may be formed, and each batch of L consecutive sets of S control resources may be mapped to S transmission units at the same location in the L tiles. For localized mapping, S>1, and each set of S control resources may be mapped to a cluster of S adjacent transmission units in one tile. For distributed mapping, S=1, and each control resource may be mapped to one transmission unit in one tile. For diversity, each control resource may be mapped to multiple (e.g., three) transmission units in at least one tile.

摘要翻译： 描述用于在无线通信系统中发送控制信息的技术。 控制段可以包括L≥1瓦片，并且每个瓦片可以包括多个传输单元。 可以将多个控制资源定义并映射到控制段的传输单元。 对于对称映射，可以形成多组S≥1个控制资源，并且每L批连续的S个控制资源组可以被映射到L个瓦片中相同位置处的S个传输单元。 对于局部映射，S> 1，并且每组S个控制资源可以被映射到一个瓦片中的S个相邻传输单元的簇。 对于分布式映射，S = 1，并且每个控制资源可以映射到一个瓦片中的一个传输单元。 对于分集，每个控制资源可以映射到至少一个瓦片中的多个（例如，三个）传输单元。

公开(公告)号：US20090197590A1

公开(公告)日：2009-08-06

申请号：US12261998

申请日：2008-10-30

申请人： Mohammad J. Borran ,  Aamod Khandekar ,  Naga Bhushan ,  Ashwin Sampath ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Ravi Palanki ,  Gavin B. Horn

发明人： Mohammad J. Borran ,  Aamod Khandekar ,  Naga Bhushan ,  Ashwin Sampath ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Ravi Palanki ,  Gavin B. Horn

IPC分类号： H04W24/00 ,  H04W72/00

CPC分类号： H04W72/048 ,  H04W52/242 ,  H04W52/243 ,  H04W52/28 ,  H04W52/325 ,  H04W52/34

摘要： Techniques for transmitting data with short-term interference mitigation in a wireless communication system are described. In one design, a serving base station may send a message to a terminal to trigger short-term interference mitigation. In response, the terminal may send a message to request at least one interfering base station to reduce interference on at least one resource. Each interfering base station may determine a transmit power level to be used for the at least one resource and may send a pilot at this transmit power level. The terminal may estimate the channel quality of the at least one resource based on at least one pilot received from the at least one interfering base station. The terminal may send information indicative of the estimated channel quality to the serving base station. The serving base station may send a data transmission on the at least one resource to the terminal.

摘要翻译： 描述了在无线通信系统中发送具有短期干扰抑制的数据的技术。 在一种设计中，服务基站可以向终端发送消息以触发短期干扰减轻。 作为响应，终端可以发送消息以请求至少一个干扰基站以减少对至少一个资源的干扰。 每个干扰基站可以确定要用于至少一个资源的发射功率电平，并且可以以该发射功率电平发送导频。 终端可以基于从至少一个干扰基站接收的至少一个导频来估计至少一个资源的信道质量。 终端可以向服务基站发送表示估计的信道质量的信息。 服务基站可以向终端发送至少一个资源上的数据传输。

公开(公告)号：US20090197538A1

公开(公告)日：2009-08-06

申请号：US12262013

申请日：2008-10-30

申请人： Mohammad J. Borran ,  Aamod Khandekar ,  Naga Bhushan ,  Ashwin Sampath ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Ravi Palanki ,  Gavin B. Horn

发明人： Mohammad J. Borran ,  Aamod Khandekar ,  Naga Bhushan ,  Ashwin Sampath ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Ravi Palanki ,  Gavin B. Horn

IPC分类号： H04B1/00

CPC分类号： H04W52/243 ,  H04B7/0617 ,  H04B17/382 ,  H04W52/247

摘要： Techniques for transmitting data with short-term interference mitigation in a wireless communication system are described. In one design, a first station (e.g., a base station or a terminal) may send a first message to at least one interfering station to request reduction of interference on at least one resource. The first station may send the first message in anticipation of receiving data on the at least one resource. An interfering station may receive the first message from the first station and may reduce interference on the at least one resource by reducing its transmit power and/or by steering its power in a direction different from the first station. The first station may thereafter receive data from a second station on the at least one resource. The techniques may be used for data transmission on the forward and reverse links.

摘要翻译： 描述了在无线通信系统中发送具有短期干扰抑制的数据的技术。 在一种设计中，第一站（例如，基站或终端）可以向至少一个干扰站发送第一消息，以请求减少对至少一个资源的干扰。 第一站可以发送第一消息以预期在至少一个资源上接收数据。 干扰站可以从第一站接收第一消息，并且可以通过减少其发射功率和/或通过在与第一站不同的方向上转向其功率来减少对至少一个资源的干扰。 此后，第一站可以在至少一个资源上从第二站接收数据。 这些技术可以用于前向和反向链路上的数据传输。

公开(公告)号：US08885628B2

公开(公告)日：2014-11-11

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： H04B7/216 ,  H04J4/00 ,  H04B7/00 ,  H04L5/00 ,  H04B1/692 ,  H04J11/00 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

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。

公开(公告)号：US20120188994A1

公开(公告)日：2012-07-26

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： H04B1/715 ,  H04W24/00

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：US08135088B2

公开(公告)日：2012-03-13

申请号：US11175607

申请日：2005-07-05

申请人： Ravi Palanki ,  Aamod Khandekar

发明人： Ravi Palanki ,  Aamod Khandekar

IPC分类号： H04L27/00

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 transmitter generates a pilot having a constant time-domain envelope and a flat frequency spectrum based on a polyphase sequence. To generate a pilot IFDMA symbol, a first sequence of pilot symbols is formed based on the polyphase sequence and replicated multiple times to obtain a second sequence of pilot symbols. A phase ramp is applied to the second pilot symbol sequence to obtain a third sequence of output symbols. A cyclic prefix is appended to the third sequence of output symbols to obtain an IFDMA symbol, which is transmitted in the time domain via a communication channel. The pilot symbols may be multiplexed with data symbols using TDM and/or CDM. A pilot LFDMA symbol may also be generated with a polyphase sequence and multiplexed using TDM or CDM. A receiver derives a channel estimate based on received pilot symbols and using minimum mean-square error, least-squares, or some other channel estimation technique.

摘要翻译： 发射机产生具有恒定时域包络和基于多相序列的平坦频谱的导频。 为了产生导频IFDMA符号，基于多相序列形成第一导频符号序列并多次复制以获得导频符号的第二序列。 将相位斜坡施加到第二导频符号序列以获得第三输出符号序列。 循环前缀被附加到第三输出符号序列以获得经由通信信道在时域中发送的IFDMA符号。 可以使用TDM和/或CDM将导频符号与数据符号复用。 也可以使用多相序列生成导频LFDMA符号，并使用TDM或CDM进行复用。 接收机基于接收到的导频符号并使用最小均方误差，最小二乘法或一些其它信道估计技术来导出信道估计。

公开(公告)号：US08077692B2

公开(公告)日：2011-12-13

申请号：US11431970

申请日：2006-05-10

申请人： Aamod Khandekar ,  Ravi Palanki

发明人： Aamod Khandekar ,  Ravi Palanki

IPC分类号： H04L12/56

CPC分类号： H04L27/2618 ,  H04L5/0007 ,  H04L5/0039 ,  H04L5/0041 ,  H04L5/0046 ,  H04L25/0228 ,  H04L25/03159

摘要： Enhanced frequency division multiple access (EFDMA) is a multiplexing scheme that sends modulation symbols in the time domain and achieves a lower PAPR than OFDM. An EFDMA symbol occupies multiple subband groups that are spaced apart in a frequency band, with each subband group containing multiple adjacent subbands. To generate an EFDMA symbol, multiple modulation symbols are mapped onto a first sequence of symbols. A transform (e.g., a DFT) is performed on the first sequence to obtain a second sequence of values. The values in the second sequence corresponding to the subbands used for the EFDMA symbol are retained, and the remaining values are zeroed out to obtain a third sequence of values. An inverse transform (e.g., an IDFT) is performed on the third sequence to obtain a fourth sequence of samples. A phase ramp may be applied on the fourth sequence, and a cyclic prefix is appended to form the EFDMA symbol.

摘要翻译： 增强型频分多址（EFDMA）是在时域中发送调制符号并实现比OFDM更低的PAPR的复用方式。 EFDMA符号占据在频带中间隔开的多个子带组，每个子带组包含多个相邻子带。 为了产生EFDMA符号，将多个调制符号映射到第一符号序列上。 对第一序列执行变换（例如，DFT）以获得第二值序列。 对应于用于EFDMA符号的子带的第二序列中的值被保留，并且剩余的值被清零以获得第三值序列。 对第三序列执行逆变换（例如，IDFT）以获得第四序列。 可以在第四序列上施加相位斜坡，并且附加循环前缀以形成EFDMA符号。

公开(公告)号：US07974362B2

公开(公告)日：2011-07-05

申请号：US12091432

申请日：2006-10-27

申请人： Ravi Palanki ,  Aamod Khandekar

发明人： Ravi Palanki ,  Aamod Khandekar

IPC分类号： H04L27/00

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 reverse link hopping is provided, comprising initializing permutation constants, determining a value for p such that i

摘要翻译： 提供一种用于产生用于反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 <2p其中i是第一计数器的值，将第二计数器j初始化为“0” 将x设置为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，伪随机数的最低有效位（LSB），递增 确定j是否等于3或x小于或等于i，确定x是否大于i，将x设置为等于x-i，交换阵列A中的第i个和第x个元素，递减计数器 i乘1，并且基于所生成的跳转排列将一组跳转端口映射到一组子载波。

公开(公告)号：US20110064121A1

公开(公告)日：2011-03-17

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： H04B1/707

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.