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51. 发明授权

US07463576B2 Channel estimation for OFDM communication systems 有权
标题翻译： OFDM通信系统的信道估计
公开(公告)号：US07463576B2
公开(公告)日：2008-12-09
申请号：US11101908
申请日：2005-04-07
申请人： Ranganathan Krishnan , Tamer Kadous
发明人： Ranganathan Krishnan , Tamer Kadous
IPC分类号： H04J11/00
CPC分类号： H04W52/325 , H04L25/0212 , H04L25/022 , H04L25/023 , H04W52/24 , H04W52/34 , H04W52/42
摘要： Techniques to estimate the frequency response of a wireless channel in an OFDM system. In one method, an initial estimate of the frequency response of the wireless channel is obtained for a first group of subbands based on a pilot transmission received via the subbands in the first group. An estimate of the impulse response of the wireless channel is then derived based on the initial frequency response estimate. An enhanced estimate of the frequency response of the wireless channel is then derived for a second group of subbands based on the impulse response estimate. The first and second groups may each include all or only a subset of the usable subbands. Subband multiplexing may be used to allow simultaneous pilot transmissions by multiple terminals on their associated groups of subbands.
摘要翻译：估计OFDM系统中无线信道的频率响应的技术。在一种方法中，基于经由第一组中的子带接收的导频传输，针对第一组子带获得无线信道的频率响应的初始估计。然后基于初始频率响应估计推导出无线信道的脉冲响应的估计。然后基于脉冲响应估计对第二组子带导出对无线信道的频率响应的增强估计。第一组和第二组可以各自包括全部或仅一个可用子带的子集。子带复用可用于允许在其相关联的子带组上的多个终端的同时导频传输。

52. 发明申请

US20080112495A1 PILOT TRANSMISSION AND CHANNEL ESTIMATION FOR MULTIPLE TRANSMITTERS 审中-公开
标题翻译：多台发射机的导频传输和信道估计
公开(公告)号：US20080112495A1
公开(公告)日：2008-05-15
申请号：US11873375
申请日：2007-10-16
申请人： Dhananjay Ashok Gore , Avneesh Agrawal , Tamer Kadous
发明人： Dhananjay Ashok Gore , Avneesh Agrawal , Tamer Kadous
IPC分类号： H04K1/10
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。

53. 发明申请

US20080025241A1 METHOD AND APPARATUS FOR BROADCAST MULTICAST SERVICE IN AN ULTRA MOBILE BROADBAND NETWORK 审中-公开
标题翻译：超大规模移动宽带网络中广播多播服务的方法与装置
公开(公告)号：US20080025241A1
公开(公告)日：2008-01-31
申请号：US11829750
申请日：2007-07-27
申请人： Naga Bhushan , Parag Agashe , Sandip Sarkar , Tamer Kadous
发明人： Naga Bhushan , Parag Agashe , Sandip Sarkar , Tamer Kadous
IPC分类号： H04H1/00
CPC分类号： H04L27/3488 , H04L12/1886 , H04L12/189 , H04L27/2602 , H04N21/6131 , H04N21/631 , H04N21/6405 , H04W72/005
摘要： A method and apparatus for broadcast multicast service in an ultra mobile broadband network is provided. An apparatus is provided which is operable in a wireless communication system to provide a means for mapping broadcast flows to a broadcast multicast logical channel and transmitting the broadcast multicast logic channel on an aggregation of broadcast physical channels, where each of the aggregation of the broadcast physical channels is uniquely characterized. Radio configurations to support the ultra mobile broadband network are also provided.
摘要翻译：提供了一种在超移动宽带网络中广播组播服务的方法和装置。提供了一种可在无线通信系统中操作以提供用于将广播流映射到广播多播逻辑信道的装置并且在广播物理信道的聚合上发送广播多播逻辑信道的装置，其中广播物理渠道是独特的特征。还提供了支持超移动宽带网络的无线电配置。

54. 发明申请

US20070195688A1 SPATIAL PILOT STRUCTURE FOR MULTI-ANTENNA WIRELESS COMMUNICATION 失效
标题翻译：用于多天线无线通信的空间导频结构
公开(公告)号：US20070195688A1
公开(公告)日：2007-08-23
申请号：US11677000
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： H04J11/00
CPC分类号： H04L5/1438 , H04B7/0452 , H04B7/0626 , H04B7/063 , H04B7/0639 , H04J13/0044 , H04L1/0002 , H04L1/0025 , H04L1/0028 , H04L1/06 , H04L1/1671 , H04L1/1812 , H04L5/0026 , H04L5/0048 , H04L5/023 , H04L25/0204 , H04L25/0206 , H04L25/0226 , H04L27/2613 , H04W28/06 , H04W28/18 , H04W48/08 , Y02D70/1222 , Y02D70/1224 , Y02D70/1242 , Y02D70/1262 , Y02D70/144 , Y02D70/23 , Y02D70/24 , Y02D70/444
摘要： Spatial pilot to support MIMO receivers in a multi-antenna and multi-layer transmission communication system. A first layer pilot for a single layer transmission is repeated across subbands in a first OFDM symbol and the first layer pilot is also repeated offset from the first OFDM symbol in an adjacent second OFDM symbol. Additional transmission layers may also be transmitted each include a separate pilot generated and repeated in the first symbol and repeated offset form the separate pilot in an adjacent second symbol. The first and second OFDM symbols are then transmitted and received to characterize the receive channels.
摘要翻译：在多天线和多层传输通信系统中支持MIMO接收机的空间导频。在第一OFDM符号中的子带上重复用于单层传输的第一层导频，并且第一层导频也在邻近的第二OFDM符号中与第一OFDM符号重复偏移。还可以传输附加的传输层，每个传输层包括在第一符号中生成和重复的单独的导频，并且在相邻的第二符号中从单独的导频重复偏移。然后发送和接收第一和第二OFDM符号以表征接收信道。

55. 发明授权

US07054375B2 Method and apparatus for error reduction in an orthogonal modulation system 失效
公开(公告)号：US07054375B2
公开(公告)日：2006-05-30
申请号：US09745301
申请日：2000-12-22
申请人： Anand Kannan , Tamer Kadous
发明人： Anand Kannan , Tamer Kadous
IPC分类号： H04K1/10
CPC分类号： H04L5/006 , H04L1/0025 , H04L5/0007 , H04L5/0023 , H04L5/0044 , H04L2025/03414
摘要： A method and apparatus reduces error in a communication system that includes multiple orthogonal subcarriers by suppressing a subcarrier in a transmitting communication device and by equalizing a received signal in a receiving communication device. Subcarrier suppression is based on a determination of a signal quality metric with respect to each subcarrier or is based on a determination of excessive signal power overdriving an amplifier of the receiving communication device. Equalization of the received signal is based on an equalization function that reduces a multipath delay introduced to the transmitted signal when the multipath delay exceeds a tolerable multipath delay.

56. 发明申请

US20060018397A1 Capacity based rank prediction for MIMO design 有权
公开(公告)号：US20060018397A1
公开(公告)日：2006-01-26
申请号：US11022347
申请日：2004-12-22
申请人： Hemanth Sampath , Tamer Kadous
发明人： Hemanth Sampath , Tamer Kadous
IPC分类号： H04L27/20 , H04B7/02 , H04L27/12 , H04B7/10
CPC分类号： H04L5/0046 , H04B17/336 , H04L1/0003 , H04L1/0009 , H04L1/0026 , H04L1/0071 , H04L1/065 , H04L1/0656 , H04L1/1812 , H04L5/0023 , H04L5/006 , H04L5/023 , H04L25/0204 , H04L25/0242 , H04L25/03343 , H04L27/2608 , H04L27/2626 , H04L2025/03426
摘要： The performance of a Single Code Word (SCW) design with low complexity MMSE receiver & rank prediction is similar to the Multiple Code Word (MCW) design with successive interference cancellation (SIC). A method of rank prediction comprises calculating MIMO channel matrices corresponding to layer transmissions for each tone, calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices, mapping the SNR for each tone to generate effective SNRs for each layer transmission, calculating additive white Gaussian noise (AWGN) capacities corresponding to the effective SNRs and maximizing an over-all spectral efficiency based on the AWGN capacities; and selecting a rank based on maximizing the over-all spectral efficiency.

57. 发明申请

US20050088959A1 Rate selection for a multi-carrier MIMO system 有权
标题翻译：多载波MIMO系统的速率选择
公开(公告)号：US20050088959A1
公开(公告)日：2005-04-28
申请号：US10778570
申请日：2004-02-13
申请人： Tamer Kadous
发明人： Tamer Kadous
IPC分类号： H04J99/00 , H04L1/00 , H04L1/06 , H04L1/16 , H04L27/26 , H04J11/00
CPC分类号： H04L5/006 , H04L1/0003 , H04L1/0025 , H04L1/16 , H04L1/1671 , H04L5/0023 , H04L5/0046 , H04L27/2626 , H04L27/2647 , Y02D50/10
摘要： To select a rate for data transmission in a multi-carrier MIMO system with a multipath MIMO channel, a post-detection SNR SNRl(k) for each subband k of each spatial channel l is initially determined and used to derive a constrained spectral efficiency Sl(k) based on a constrained spectral efficiency function fsiso(SNRl(k), M) of SNR and modulation scheme M. An average constrained spectral efficiency Savg for all subbands of all spatial channels used for data transmission is next determined based on the constrained spectral efficiencies for the individual subbands/spatial channels. An equivalent SNR needed by an equivalent system with an AWGN channel to support a data rate of Savg is determined based on an inverse constrained spectral efficiency function fsiso−1(Savg, M). A rate is selected for the multi-carrier MIMO system based on the equivalent SNR. The selected rate is the highest rate among all supported rates with a required SNR less than or equal to the equivalent SNR.
摘要翻译：为了在具有多径MIMO信道的多载波MIMO系统中选择用于数据传输的速率，首先确定每个空间信道l的每个子带k的后检测SNR SNR（k），并且用于基于受约束的频谱效率函数f（s）来估计约束频谱效率S（k），其中，M（k））和调制方案M.接下来基于用于各个子带/空间信道的约束频谱效率来确定用于数据传输的所有空间信道的所有子带的平均约束频谱效率S avg 。由具有AWGN信道的等效系统所需的用于支持数据速率为平均值的等效信号是基于逆约束频谱效率函数来确定的， 1（S平均值，M）。基于等效SNR为多载波MIMO系统选择速率。所选择的速率是所有支持的速率中具有所需SNR小于或等于等效SNR的最高速率。

58. 发明授权

US06873606B2 Rate adaptive transmission scheme for MIMO systems 有权
标题翻译： MIMO系统速率自适应传输方案
公开(公告)号：US06873606B2
公开(公告)日：2005-03-29
申请号：US10367234
申请日：2003-02-14
申请人： Avneesh Agrawal , Rajiv Vijayan , Tamer Kadous
发明人： Avneesh Agrawal , Rajiv Vijayan , Tamer Kadous
IPC分类号： H04B7/00 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/00 , H04L1/06 , H04B1/02
CPC分类号： H04L1/0618 , H04B7/0417 , H04B7/0443 , H04B7/0465 , H04B7/0615 , H04B7/0891 , H04W52/34 , H04W52/42
摘要： A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.
摘要翻译：可以传输可变数量的数据符号流的MIMO系统的速率自适应传输方案为每个数据符号流提供发射分集，并且充分利用系统的总发射功率和每个天线的全功率。在一种方法中，接收至少一个数据符号流用于从多个天线发射。每个数据符号流用对应于分配给该流的发射功率的量的相应权重进行缩放。缩放的数据符号流与发射基矩阵相乘以为多个天线提供多个发射符号流。定义发射基矩阵（例如，沃尔什 - 哈达玛矩阵或DFT矩阵），使得每个数据符号流从所有天线发送，并且每个发射符号流以（或接近）相关天线的全功率发射。

59. 发明申请

US20050013239A1 Rate adaptive transmission scheme for mimo systems 有权
标题翻译： mimo系统的速率自适应传输方案
公开(公告)号：US20050013239A1
公开(公告)日：2005-01-20
申请号：US10919698
申请日：2004-08-16
申请人： Avneesh Agrawal , Rajiv Vijayan , Tamer Kadous
发明人： Avneesh Agrawal , Rajiv Vijayan , Tamer Kadous
IPC分类号： H04B7/00 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/00 , H04L1/06 , H04J11/00 , H04Q7/00
CPC分类号： H04L1/0618 , H04B7/0417 , H04B7/0443 , H04B7/0465 , H04B7/0615 , H04B7/0891 , H04W52/34 , H04W52/42
摘要： A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.
摘要翻译：可以传输可变数量的数据符号流的MIMO系统的速率自适应传输方案为每个数据符号流提供发射分集，并且充分利用系统的总发射功率和每个天线的全功率。在一种方法中，接收至少一个数据符号流用于从多个天线发射。每个数据符号流用对应于分配给该流的发射功率的量的相应权重进行缩放。缩放的数据符号流与发射基矩阵相乘以为多个天线提供多个发射符号流。定义发射基矩阵（例如，沃尔什 - 哈达玛矩阵或DFT矩阵），使得每个数据符号流从所有天线发送，并且每个发射符号流以（或接近）相关天线的全功率发射。

60. 发明申请

US20050008092A1 Ordered successive interference cancellation receiver processing for multipath channels 有权
标题翻译：用于多路径通道的有序连续干扰消除接收机处理
公开(公告)号：US20050008092A1
公开(公告)日：2005-01-13
申请号：US10917079
申请日：2004-08-11
申请人： Tamer Kadous
发明人： Tamer Kadous
IPC分类号： H04L1/06 , H04B3/46
CPC分类号： H04L1/0618
摘要： Techniques to process a number of “received” symbol streams in a Multiple-Input Multiple-Output (MIMO) system with multipath channels such that improved performance may be achieved when using successive interference cancellation (SIC) processing. In an aspect, metrics indicative of the quality or “goodness” of a “detected” symbol stream are provided. These metrics consider the frequency selective response of the multipath channels used to transmit the symbol stream. For example, the metrics may relate to (1) an overall channel capacity for all transmission channels used for the symbol stream, or (2) an equivalent signal-to-interference noise ratio (SNR) of an Additive White Gaussian Noise (AWGN) channel modeling these transmission channels. In another aspect, techniques are provided to process the received symbol streams, using SIC processing, to recover a number of transmitted symbol streams. The particular order in which the symbol streams are recovered is determined based on the metrics determined for symbol streams detected at each SIC processing stage.
摘要翻译：在具有多路径信道的多输入多输出（MIMO）系统中处理多个“接收”符号流的技术，使得当使用连续干扰消除（SIC）处理时可以实现改进的性能。在一方面，提供了指示“检测”符号流的质量或“良好”的度量。这些度量考虑了用于发送符号流的多径信道的频率选择响应。例如，度量可以涉及（1）用于符号流的所有传输信道的总体信道容量，或者（2）加性白高斯噪声（AWGN）的等效信号与干扰噪声比（SNR）通道建模这些传输通道。在另一方面，提供了使用SIC处理来处理所接收的符号流的技术来恢复多个传输的符号流。基于为在每个SIC处理阶段检测到的符号流确定的度量来确定符号流被恢复的特定顺序。

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