公开(公告)号：US20060014499A1

公开(公告)日：2006-01-19

申请号：US11155204

申请日：2005-06-16

申请人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

发明人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

IPC分类号： H04B1/02 ,  H04B1/66

CPC分类号： H04L1/005 ,  H04L1/0003 ,  H04L1/0041 ,  H04L1/06

摘要： A MIMO communication system is adapted to encode multiple data streams at the same adaptable rate. Accordingly, the set of all possible modulation/rate combinations to all modulations with common rates is decreased thus resulting in the reduction of the number of possible packet formats carrying the data streams. Rate prediction is made more error-resilient, in part, due to the averaging over all information rates. Furthermore, the signaling overhead of the packets is reduced. Therefore, the tradeoff between the desired transmission rate granularity on the one hand, and robustness/signaling overhead on the other hand, is controlled by adjusting the coding rate.

公开(公告)号：US08457152B2

公开(公告)日：2013-06-04

申请号：US11155204

申请日：2005-06-16

申请人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

发明人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

IPC分类号： H04J3/16 ,  H04J9/00

CPC分类号： H04L1/005 ,  H04L1/0003 ,  H04L1/0041 ,  H04L1/06

摘要： A MIMO communication system is adapted to encode multiple data streams at the same adaptable rate. Accordingly, the set of all possible modulation/rate combinations to all modulations with common rates is decreased thus resulting in the reduction of the number of possible packet formats carrying the data streams. Rate prediction is made more error-resilient, in part, due to the averaging over all information rates. Furthermore, the signaling overhead of the packets is reduced. Therefore, the tradeoff between the desired transmission rate granularity on the one hand, and robustness/signaling overhead on the other hand, is controlled by adjusting the coding rate.

摘要翻译： MIMO通信系统适于以相同的可适应速率对多个数据流进行编码。 因此，对具有公共速率的所有调制的所有可能的调制/速率组合的集合被减少，从而导致承载数据流的可能分组格式的数量的减少。 速率预测更具有弹性，部分原因是由于所有信息速率的平均值。 此外，分组的信令开销减小。 因此，通过调整编码率来控制一方面期望的传输速率粒度与鲁棒性/信令开销之间的权衡。

公开(公告)号：US20060018411A1

公开(公告)日：2006-01-26

申请号：US11022146

申请日：2004-12-22

申请人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04L27/06

CPC分类号： H04L25/0204 ,  H04L25/0212 ,  H04L25/0226 ,  H04L27/261

摘要： Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal, and/or cyclic-shift codes. To obtain a channel estimate for a transmitter using a time-frequency pilot code composed of a time-only code and a frequency-only code, a receiver multiplies a set of received symbols for each symbol period with a set of code values for the frequency-only code to obtain a set of detected symbols and performs an IDFT on the set of detected symbols to obtain an initial impulse response estimate. The receiver performs code matching on multiple initial impulse response estimates derived for multiple symbol periods with the time-only code to obtain a final impulse response estimate for the desired transmitter. The receiver retains the first L channel taps and zeroes out remaining channel taps, where L is the expected channel length.

摘要翻译： 为每个发射机分配一个仅时间导频码，仅频率导频码或用于导频传输的时频导频码。 导频码可以是伪随机，正交和/或循环移位码。 为了使用由时间唯一码和仅频率码构成的时频导频码来获得用于发射机的信道估计，接收机将用于每个符号周期的一组接收符号与频率的一组码值相乘 - 获得一组检测符号的代码，并对检测符号集合执行IDFT以获得初始脉冲响应估计。 接收机对具有多个符号周期的多个初始脉冲响应估计执行码匹配，其中仅使用时间码来获得所需发射机的最终脉冲响应估计。 接收器保留第一个L个通道抽头，并将剩余的通道抽头置零，其中L是预期的通道长度。

公开(公告)号：US20060034163A1

公开(公告)日：2006-02-16

申请号：US10890718

申请日：2004-07-13

申请人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04B1/707 ,  H04J11/00

CPC分类号： H04L25/0226 ,  H04B7/0452 ,  H04B7/0684 ,  H04L27/2613

摘要： Efficient pilot transmission schemes for multi-antenna communication systems are described. In general, MISO receivers prefer a pilot transmitted in one spatial direction, and MIMO receivers typically require a pilot transmitted in different spatial directions. In one pilot transmission scheme, a first set of T scaled pilot symbols is generated with a first training vector and transmitted (e.g., continuously) from T transmit antennas, where T>1. If MIMO receiver(s) are to be supported by the system, then at least T−1 additional sets of T scaled pilot symbols are generated with at least T−1 additional training vectors and transmitted from the T transmit antennas. The training vectors are for different (e.g., orthogonal) spatial directions. Each MISO receiver can estimate its MISO channel based on the first set of scaled pilot symbols. Each MIMO receiver can estimate its MIMO channel based on the first and additional sets of scaled pilot symbols.

公开(公告)号：US20050195763A1

公开(公告)日：2005-09-08

申请号：US11020888

申请日：2004-12-22

申请人： Tamer Kadous ,  Avneesh Agrawal ,  Dhananjay Gore

发明人： Tamer Kadous ,  Avneesh Agrawal ,  Dhananjay Gore

IPC分类号： H04J99/00 ,  H04B7/06 ,  H04L25/02 ,  H04B7/00

CPC分类号： H04L25/0226 ,  H04B7/0684

摘要： A transmitter generates multiple composite pilots with a training matrix and a gain matrix. Each composite pilot includes multiple training pilots generated with multiple columns of the training matrix and scaled with multiple gain elements in a column of the gain matrix. The transmitter transmits each composite pilot via multiple transmit antennas. A MISO receiver obtains received symbols for the multiple composite pilots and derives an estimate of a composite MISO channel. For OFDM, the MISO receiver derives an initial impulse response estimate for each composite pilot, filters the initial impulse response estimates for all composite pilots, and derives a frequency response estimate for the composite MISO channel. A MIMO receiver obtains and processes received symbols for the multiple composite pilots based on the training and gain matrices and derives channel estimates for individual SISO channels between the multiple transmit antennas and multiple receive antennas.

摘要翻译： 发射机生成具有训练矩阵和增益矩阵的多个复合导频。 每个复合导频包括由训练矩阵的多列生成的多个训练导频，并且在增益矩阵的列中用多个增益元素进行了缩放。 发射机经由多个发射天线发送每个复合导频。 MISO接收器获得用于多个复合导频的接收符号，并导出复合MISO信道的估计。 对于OFDM，MISO接收机为每个复合导频导出初始脉冲响应估计，对所有复合导频进行初始脉冲响应估计，并得出复合MISO信道的频率响应估计。 MIMO接收机基于训练和增益矩阵获得并处理多个复合导频的接收符号，并导出多个发射天线与多个接收天线之间的各个SISO信道的信道估计。

公开(公告)号：US08391196B2

公开(公告)日：2013-03-05

申请号：US11923761

申请日：2007-10-25

申请人： Alexei Gorokhov ,  Mohammad J. Borran ,  Avneesh Agrawal ,  Naga Bhushan ,  Tamer Kadous ,  Ayman Fawzy Naguib

发明人： Alexei Gorokhov ,  Mohammad J. Borran ,  Avneesh Agrawal ,  Naga Bhushan ,  Tamer Kadous ,  Ayman Fawzy Naguib

IPC分类号： G08C17/00

CPC分类号： H04W52/30 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0058 ,  H04W52/04 ,  H04W72/06 ,  Y02B30/50

摘要： Systems and methodologies are described that facilitate mitigating effect of non-linear distortion from a power amplifier on a spectral mask margin. Power limit indications can be analyzed in scheduling mobile devices. Mobile devices with power limits can be scheduled on inner subbands. The power limits can be based at least in part on power amplifier headroom information. Other mobile devices can employ remaining portions of an allocated spectrum. Further, mobile devices can evaluate and establish a power amplifier backoff based upon the subband scheduling.

公开(公告)号：US20080130589A1

公开(公告)日：2008-06-05

申请号：US11923761

申请日：2007-10-25

申请人： Alexei Gorokhov ,  Mohammad J. Borran ,  Avneesh Agrawal ,  Naga Bhushan ,  Tamer Kadous ,  Ayman Fawzy Naguib

发明人： Alexei Gorokhov ,  Mohammad J. Borran ,  Avneesh Agrawal ,  Naga Bhushan ,  Tamer Kadous ,  Ayman Fawzy Naguib

IPC分类号： H04J3/00

CPC分类号： H04W52/30 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0058 ,  H04W52/04 ,  H04W72/06 ,  Y02B30/50

摘要： Systems and methodologies are described that facilitate mitigating effect of non-linear distortion from a power amplifier on a spectral mask margin. Power limit indications can be analyzed in scheduling mobile devices. Mobile devices with power limits can be scheduled on inner subbands. The power limits can be based at least in part on power amplifier headroom information. Other mobile devices can employ remaining portions of an allocated spectrum. Further, mobile devices can evaluate and establish a power amplifier backoff based upon the subband scheduling.

摘要翻译： 描述了有助于减轻来自功率放大器的非线性失真对光谱掩模余量的影响的系统和方法。 功率限制指示可以在调度移动设备中进行分析。 具有功率限制的移动设备可以在内部子带上进行调度。 功率限制可以至少部分地基于功率放大器余量信息。 其他移动设备可以使用所分配频谱的剩余部分。 此外，移动设备可以基于子带调度来评估和建立功率放大器的退避。

公开(公告)号：US20070097910A1

公开(公告)日：2007-05-03

申请号：US11261837

申请日：2005-10-27

申请人： Tingfang Ji ,  Dhananjay Gore ,  Alexei Gorokhov ,  Min Dong ,  Avneesh Agrawal

发明人： Tingfang Ji ,  Dhananjay Gore ,  Alexei Gorokhov ,  Min Dong ,  Avneesh Agrawal

IPC分类号： H04Q7/00

CPC分类号： H04W72/06 ,  H04B1/713 ,  H04B7/026 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0044 ,  H04L5/023

摘要： A method for allocating resources in a wireless communications environment comprises receiving a mapping between a first hop-port and frequency range, and determining whether to map a second access terminal to a second hop-port that is mapped to at least the same frequency range during a substantially similar instance in time, the determination made as a function of characteristics relating to a first access terminal associated with the first hop-port. The method can further include determining that the first access terminal is a candidate for employing Space-Division Multiple Access (SDMA), and mapping the second-hop port and associating the second access terminal with the second hop-port when the second access terminal is also a candidate for employing SDMA.

摘要翻译： 一种用于在无线通信环境中分配资源的方法包括：接收第一跳跃端口和频率范围之间的映射，以及确定是否将第二接入终端映射到映射到至少相同频率范围的第二跳频端口 基本相似的时间实例，根据与与第一跳跃端口相关联的第一接入终端的特性的函数进行确定。 该方法还可以包括确定第一接入终端是采用空分多址（SDMA）的候选者，并且当第二接入终端是第二接入终端时，映射第二跳接口并将第二接入终端与第二跳接口相关联 也是采用SDMA的候选人。

公开(公告)号：US20060018393A1

公开(公告)日：2006-01-26

申请号：US11022360

申请日：2004-12-22

申请人： Dhananjay Gore ,  Avneesh Agrawal ,  Aamod Khandekar ,  Alexei Gorokhov

发明人： Dhananjay Gore ,  Avneesh Agrawal ,  Aamod Khandekar ,  Alexei Gorokhov

IPC分类号： H04K1/10

CPC分类号： H04L27/2647 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/006 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/023

摘要： A channel estimation system comprises a filtering component that selectively scales a plurality of carriers as a function of location of the plurality of carriers within a frequency band, wherein the plurality of carriers comprises at least one data carrier and at least one pilot carrier. A component thereafter extrapolates an observation from the at least one pilot carrier, wherein a channel is estimated as a function of the extrapolated observation. The scaling of the carriers facilitates reducing a flooring effect associated with channel estimation. The filtering component can be employed at a transmitter and/or at a receiver, and can be activated and/or deactivated as a function of a sensed data packet type.

公开(公告)号：US20070019535A1

公开(公告)日：2007-01-25

申请号：US11213463

申请日：2005-08-26

申请人： Sharad Sambhwani ,  Dhananjay Gore ,  Avneesh Agrawal ,  Arak Sutivong ,  Alexei Gorokhov

发明人： Sharad Sambhwani ,  Dhananjay Gore ,  Avneesh Agrawal ,  Arak Sutivong ,  Alexei Gorokhov

IPC分类号： H04J11/00 ,  H04B7/216

CPC分类号： H04J13/0048 ,  H04J13/18

摘要： Systems and methodologies are described that facilitate increasing system capacity in a code-limited WCDMA (e.g., TDD, FDD, . . . ) wireless communication environment. According to one aspect, a larger code space can be defined by introducing multiple code clusters within a sector, wherein each cluster has a unique scrambling code. Codes within a cluster can have orthogonal Walsh sequences that can be assigned to user devices to facilitate communicating over a wireless network and can overlap with codes in another cluster. The unique scrambling code assigned to each cluster can ensure that duplicate Walsh sequences in another cluster in the same sector appear as a pseudo-noise codes.

摘要翻译： 描述了在有限的WCDMA（例如，TDD，FDD，...）无线通信环境中增加系统容量的系统和方法。 根据一个方面，可以通过在扇区内引入多个码集来定义更大的码空间，其中每个群集具有唯一的扰码。 群集内的代码可以具有可被分配给用户设备的正交沃尔什序列，以便于通过无线网络进行通信并且可以与另一个群集中的代码重叠。 分配给每个簇的唯一扰码可以确保同一扇区中另一个簇中的重复沃尔什序列显示为伪噪声码。