公开(公告)号：US08639190B2

公开(公告)日：2014-01-28

申请号：US11553870

申请日：2006-10-27

申请人： Dhananjay Ashok Gore ,  Hemanth Sampath ,  Jibing Wang ,  Tamer Kadous ,  Gwendolyn D. Barriac

发明人： Dhananjay Ashok Gore ,  Hemanth Sampath ,  Jibing Wang ,  Tamer Kadous ,  Gwendolyn D. Barriac

IPC分类号： H04B1/00

CPC分类号： H04B7/0456 ,  H04L1/0016 ,  H04L1/0026 ,  H04L1/0675 ,  H04L5/023 ,  H04L25/0206 ,  H04L27/2602 ,  H04L27/2608

摘要： Techniques to enhance the performance in a wireless communication system using segments called subbands and using precoding are shown. According to one aspect, the bandwidth for transmission to an access terminal is constrained to a preferred bandwidth which is less than the bandwidth available for transmission to an access terminal and precoding information related to the subcarriers within the constrained bandwidth is provided to a transmitter. The precoding information related to the subcarriers within a constrained bandwidth provides feedback about the forward link channel properties relative to different subbands and may be fed back on a channel associated with the bandwidth.

摘要翻译： 示出了使用称为子带并使用预编码的段来增强在无线通信系统中的性能的技术。 根据一个方面，用于传输到接入终端的带宽被限制到比可用于传输到接入终端的带宽的优选带宽，并且将与受限带宽内的子载波相关的预编码信息提供给发射机。 与受限带宽内的子载波相关的预编码信息提供关于相对于不同子带的前向链路信道属性的反馈，并且可以在与带宽相关联的信道上反馈。

公开(公告)号：US20100067480A1

公开(公告)日：2010-03-18

申请号：US12545693

申请日：2009-08-21

申请人： Jibing Wang ,  Rashid Ahmed Akbar Attar ,  Tamer Kadous ,  Jing Sun

发明人： Jibing Wang ,  Rashid Ahmed Akbar Attar ,  Tamer Kadous ,  Jing Sun

IPC分类号： H04W72/04 ,  H04J1/00

CPC分类号： H04B7/0413 ,  H04L5/0007 ,  H04L5/0048

摘要： A system has multiple antennas, a Time Division Multiplexing (TDM) module creating TDM slots, and demultiplexing circuitry inserting within the TDM slots Orthogonal Frequency Division Multiplexing (OFDM) symbols and associating the TDM slots with data sub-streams. The system also includes precoding circuitry associating the data sub-streams with multiple tones. Each of the respective tones corresponds to a respective one of the antennas. The antennas transmit the data sub-streams using the multiple tones.

摘要翻译： 系统具有多个天线，创建TDM时隙的时分复用（TDM）模块，以及在TDM时隙正交频分复用（OFDM）符号内插入多路复用电路，并将TDM时隙与数据子流相关联。 该系统还包括将数据子流与多个音调相关联的预编码电路。 各个音调中的每一个对应于相应的一个天线。 天线使用多个音调发送数据子流。

公开(公告)号：US07668125B2

公开(公告)日：2010-02-23

申请号：US10785292

申请日：2004-02-23

申请人： Tamer Kadous

发明人： Tamer Kadous

IPC分类号： H04B7/00

CPC分类号： H04L1/1819 ,  H04B7/0417 ,  H04L1/0002 ,  H04L1/0025 ,  H04L1/06 ,  H04L25/0328 ,  H04L27/2601 ,  H04W52/286 ,  Y02D50/10

摘要： For incremental redundancy transmission on multiple parallel channels in a MIMO system, a transmitter processes (e.g., encodes, partitions, interleaves, and modulates) each data packet for each parallel channel based on a rate selected for the parallel channel and obtains multiple symbol blocks for the packet. For each data packet, the transmitter transmits one symbol block at a time on its parallel channel until a receiver recovers the packet or all blocks have been transmitted. The receiver performs detection and obtains symbol blocks transmitted on the parallel channels. The receiver recovers the data packets transmitted on the parallel channels independently or in a designated order. The receiver processes (e.g., demodulates, deinterleaves, re-assembles, and decodes) all symbol blocks obtained for each data packet and provides a decoded packet. The receiver may estimate and cancel interference due to recovered data packets so that data packets recovered later can achieve higher SINRs.

摘要翻译： 对于MIMO系统中的多个并行信道上的增量冗余传输，发射机基于为并行信道选择的速率对每个并行信道的每个数据分组进行处理（例如，编码，分割，交织和调制），并获得多个符号块 包。 对于每个数据分组，发射机在其并行信道上一次发送一个符号块，直到接收机恢复分组或已经发送所有块。 接收机执行检测并获得在并行信道上发送的符号块。 接收机独立地或以指定的顺序恢复在并行信道上传输的数据包。 接收机处理（例如，解调，解交织，重新组合和解码）为每个数据分组获得的所有符号块，并提供解码的分组。 接收机可以估计和消除由于恢复的数据分组引起的干扰，使得稍后恢复的数据分组可以实现更高的SINR。

公开(公告)号：US20100003931A1

公开(公告)日：2010-01-07

申请号：US12558073

申请日：2009-09-11

申请人： Ranganathan Krishnan ,  Anand D. Subramaniam ,  Tamer Kadous

发明人： Ranganathan Krishnan ,  Anand D. Subramaniam ,  Tamer Kadous

IPC分类号： H04B7/02

CPC分类号： H04W52/42 ,  H04B7/0667 ,  H04L5/0023 ,  H04L5/0048

摘要： Pilot and data transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation are provided. Subband multiplexing is used to avoid interference resulting from transmitting multiple signals simultaneously from multiple antennas. M usable subbands are initially arranged to form multiple groups of subbands, with each group including a different subset of the usable subbands. Each of T transmit antennas is then assigned one or possibly more subband groups for pilot transmission and typically one subband group for data transmission. Pilot and data may then be transmitted from each antenna on the subbands assigned to that antenna for pilot and data transmission. For each transmit antenna, the transmit power for each assigned subband may be scaled higher such that all of the total transmit power available for the antenna is used for transmission. Pilot and/or data may be transmitted simultaneously from all T antennas on all usable subbands without causing mutual interference.

摘要翻译： 提供了利用多载波调制的多天线通信系统的导频和数据传输方案。 使用子带复用来避免从多个天线同时发送多个信号导致的干扰。 M个可用的子带最初被布置成形成多个子带组，每组包括可用子带的不同子集。 每个T发射天线然后被分配一个或可能更多的子带组用于导频传输，并且通常用于一个子带组用于数据传输。 然后可以从分配给该天线的子带上的每个天线发送导频和数据用于导频和数据传输。 对于每个发射天线，每个分配的子带的发射功率可以被缩放更高，使得可用于天线的全部发射功率被用于传输。 导频和/或数据可以在所有可用子带上从所有T个天线同时传输而不引起相互干扰。

公开(公告)号：US07477693B2

公开(公告)日：2009-01-13

申请号：US11749523

申请日：2007-05-16

申请人： Anand Subramaniam ,  Tamer Kadous

发明人： Anand Subramaniam ,  Tamer Kadous

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/0242 ,  H04L25/0208 ,  H04L27/2601

摘要： Techniques to derive a channel estimate using substantially fewer number of complex multiplications than with a brute-force method to derive the same channel estimate. In one method, an intermediate vector B is initially derived based on K sub-vectors of a vector Ĥ for a channel frequency response estimate and at least two DFT sub-matrices for a DFT matrix {tilde over (W)}, where K>1. An intermediate matrix A for the DFT matrix {tilde over (W)} is also obtained. A least square channel impulse response estimate is then derived based on the intermediate vector B and the intermediate matrix A. In one implementation, the intermediate vector B is obtained by first computing DFTs of a matrix ĤT×L, which is formed based on the vector Ĥ, to provide a matrix GL×L. Inner products between the columns of a base DFT sub-matrix W1 and the rows of the matrix GL×L are then computed to obtain the entries of the intermediate vector B.

摘要翻译： 使用大量更少数量的复数乘法来获得信道估计的技术，而不是用蛮力方法来导出相同的信道估计。 在一种方法中，基于用于信道频率响应估计的向量H的K个子向量和用于DFT矩阵的至少两个DFT子矩阵（波形）（W）}，最初导出中间向量B，其中K> 1。 还获得了用于DFT矩阵{波前（W）}的中间矩阵A. 然后基于中间向量B和中间矩阵A导出最小二乘信道脉冲响应估计。在一个实现中，通过首先计算基于向量H形成的矩阵HTxL的DFT来获得中间向量B， 以提供矩阵GLxL。 然后计算基本DFT子矩阵W1的列与矩阵GLxL的行之间的内积，以获得中间向量B的条目。

公开(公告)号：US20080084843A1

公开(公告)日：2008-04-10

申请号：US11869589

申请日：2007-10-09

申请人： Alexei Gorokhov ,  Tamer Kadous

发明人： Alexei Gorokhov ,  Tamer Kadous

IPC分类号： H04Q7/00

CPC分类号： H04B7/0697 ,  H04L1/1685 ,  H04L2001/0093 ,  H04W16/28 ,  H04W72/12

摘要： Space division multiple access channelization is provided that includes scheduling transmission for two or more terminals and utilizing different code offsets that correspond to different sub-trees. The transmissions can be scheduled on overlapping frequency resources for overlapping time periods on different spatial resources. The pilot code offsets provide different pilot signatures so that the pilot transmissions do not overlap. The overlapping frequency resources can partially overlap or completely overlap.

摘要翻译： 提供了空分多址信道化，其包括对两个或更多个终端进行调度传输，并利用与不同子树相对应的不同的码偏移。 可以在重叠的频率资源上调度传输，以便在不同的空间资源上重叠时间段。 导频代码偏移提供不同的导频签名，使得导频传输不重叠。 重叠频率资源可能部分重叠或完全重叠。

公开(公告)号：US20080056387A1

公开(公告)日：2008-03-06

申请号：US11893834

申请日：2007-08-17

申请人： Sandip Sakar ,  Aamod Khandekar ,  Tamer Kadous

发明人： Sandip Sakar ,  Aamod Khandekar ,  Tamer Kadous

IPC分类号： H04N11/02

CPC分类号： H04W72/005

摘要： Methods and apparatus for assigning, identifying and controlling broadcast transmissions are disclosed. A broadcast flow is assigned to a broadcast logical channel of the physical resources of a wireless communication channel. A broadcast channel control message indicative of parameters of the broadcast logical channel is generated. Upon receipt, the broadcast channel control message is processed and used to accordingly process the received broadcast transmission.

摘要翻译： 公开了用于分配，识别和控制广播传输的方法和装置。 广播流被分配给无线通信信道的物理资源的广播逻辑信道。 生成表示广播逻辑信道的参数的广播信道控制消息。 在接收到广播频道控制消息时，处理并用于相应地处理所接收的广播传输。

公开(公告)号：US20080019314A1

公开(公告)日：2008-01-24

申请号：US11761798

申请日：2007-06-12

申请人： Alexei Gorokhov ,  Aamod Khandekar ,  Tamer Kadous ,  Mohammad Borran ,  Rajat Prakash

发明人： Alexei Gorokhov ,  Aamod Khandekar ,  Tamer Kadous ,  Mohammad Borran ,  Rajat Prakash

IPC分类号： H04Q7/00

CPC分类号： H04L5/0016 ,  H04B1/7075 ,  H04L5/0026 ,  H04L5/0053 ,  H04L25/0226 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2657

摘要： Techniques to transmit pilot on a CDMA segment on the reverse link in a wireless communication system are described. A terminal generates a scrambling sequence based on its pilot information. The pilot information may be used for the entire duration of a call by the terminal and for all sectors with which the terminal communicates during the call. The terminal generates pilot symbols based on the scrambling sequence, maps the pilot symbols to the CDMA segment, generates OFDM symbols with the mapped pilot symbols, and sends the OFDM symbols to one or more sectors. A base station processes received OFDM symbols to obtain received symbols for the CDMA segment. The base station generates the scrambling sequence based on the pilot information for the terminal and processes the received symbols with the scrambling sequence to obtain at least one parameter (e.g., received signal strength) for the terminal.

摘要翻译： 描述了在无线通信系统中在反向链路上的CDMA分段上发送导频的技术。 终端根据其导频信息产生加扰序列。 导频信息可以用于终端和呼叫期间终端通信的所有扇区的呼叫的整个持续时间。 终端基于加扰序列生成导频符号，将导频符号映射到CDMA分段，用映射的导频符号生成OFDM符号，并将OFDM符号发送到一个或多个扇区。 基站处理接收到的OFDM符号以获得CDMA段的接收符号。 基站根据终端的导频信息生成加扰序列，并用加扰序列处理接收到的符号，以获得终端的至少一个参数（例如，接收信号强度）。

公开(公告)号：US20070211811A1

公开(公告)日：2007-09-13

申请号：US11749523

申请日：2007-05-16

申请人： Anand Subramaniam ,  Tamer Kadous

发明人： Anand Subramaniam ,  Tamer Kadous

IPC分类号： H04K1/10

CPC分类号： H04L25/0242 ,  H04L25/0208 ,  H04L27/2601

摘要： Techniques to derive a channel estimate using substantially fewer number of complex multiplications than with a brute-force method to derive the same channel estimate. In one method, an intermediate vector B is initially derived based on K sub-vectors of a vector Ĥ for a channel frequency response estimate and at least two DFT sub-matrices for a DFT matrix {tilde over (W)}, where K>1. An intermediate matrix A for the DFT matrix {tilde over (W)} is also obtained. A least square channel impulse response estimate is then derived based on the intermediate vector B and the intermediate matrix A. In one implementation, the intermediate vector B is obtained by first computing DFTs of a matrix ĤT×L, which is formed based on the vector Ĥ, to provide a matrix GL×L. Inner products between the columns of a base DFT sub-matrix W1 and the rows of the matrix GL×L are then computed to obtain the entries of the intermediate vector B.

摘要翻译： 使用大量更少数量的复数乘法来获得信道估计的技术，而不是用蛮力方法来导出相同的信道估计。 在一种方法中，基于用于信道频率响应估计的向量H的K个子向量和用于DFT矩阵W的至少两个DFT子矩阵，其中K> 1，最初导出中间向量B. 还获得了用于DFT矩阵W的中间矩阵A. 然后基于中间向量B和中间矩阵A导出最小二乘信道脉冲响应估计。在一个实现中，中间向量B是通过首先计算矩阵H TxL 的DFT来获得的， 基于矢量H形成，以提供矩阵G L L L L L L L L L L L L L L L L L L L L L L L L 然后计算基本DFT子矩阵W 1的列与矩阵G LxL的列之间的内积，以获得中间向量B的条目。

公开(公告)号：US20070195740A1

公开(公告)日：2007-08-23

申请号：US11676960

申请日：2007-02-20

申请人： Naga Bhushan ,  Tamer Kadous ,  Mingxi Fan ,  Yongbin Wei

发明人： Naga Bhushan ,  Tamer Kadous ,  Mingxi Fan ,  Yongbin Wei

IPC分类号： H04B7/216

CPC分类号： H04B7/2656 ,  H04L1/0003 ,  H04L1/0007 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/1671 ,  H04L1/18 ,  H04L1/1887 ,  H04L5/0007 ,  H04L5/0016 ,  H04L5/0028 ,  H04L5/0053 ,  H04W28/06 ,  H04W88/04

摘要： Techniques for efficiently sending and receiving data in a wireless communication system are described herein. The techniques utilize a slot structure that is backward compatible with existing design. The techniques include sending and receiving forward link packets that occupy less than a full slot of the slot structure. An output waveform, which includes at least one slot, is generated at an access point. Each slot is segmented into two half-slots, wherein at least one half-slot includes a data unit of a packet. At a terminal, the output waveform is received and processed to extract the data unit and the data unit is processed to determine whether it is accurate. The terminal also generates ACK/NACK information in response to the results of processing the data unit and transmits channel information including the ACK/NACK information. The access point interprets the ACK/NACK information to determine if the data unit should be resent.

摘要翻译： 本文描述了用于在无线通信系统中有效发送和接收数据的技术。 该技术利用与现有设计向后兼容的槽结构。 这些技术包括发送和接收占用小于槽结构的完整时隙的前向链路分组。 在接入点处产生包括至少一个时隙的输出波形。 每个时隙被分割成两个半时隙，其中至少一个半时隙包括分组的数据单元。 在终端，接收并处理输出波形以提取数据单元，并处理数据单元以确定其是否准确。 终端还响应于处理数据单元的结果产生ACK / NACK信息，并发送包括ACK / NACK信息的信道信息。 接入点解释ACK / NACK信息，以确定数据单元是否应重新发送。