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61. 发明申请

US20090304116A1 HARDWARE ENGINE TO DEMOD SIMO, MIMO, AND SDMA SIGNALS 有权
标题翻译：硬件引擎解析SIMO，MIMO和SDMA信号
公开(公告)号：US20090304116A1
公开(公告)日：2009-12-10
申请号：US12408603
申请日：2009-03-20
申请人： Raghu N. Challa , Hemanth Sampath , Gwendolyn D. Barriac
发明人： Raghu N. Challa , Hemanth Sampath , Gwendolyn D. Barriac
IPC分类号： H04L27/06
CPC分类号： H04L25/03019 , H04L2025/03426 , H04L2025/03726
摘要： An apparatus including a configurable demodulation architecture which includes a control module and a demodulation engine. The control module includes a set of one or more control fields. The demodulation engine includes a spatial whitening module, a Minimum Mean Square Estimation (MMSE) module, at least a first Maximal Ratio Combining (MRC) module, and at least one multiplexer. Further, the multiplexer is coupled to the instruction module and controlled based on the control fields to select at least one of the MMSE module or MRC module.
摘要翻译：一种包括可配置解调架构的装置，其包括控制模块和解调引擎。控制模块包括一组一个或多个控制域。解调引擎包括空间白化模块，最小均方估计（MMSE）模块，至少第一最大比组合（MRC）模块和至少一个多路复用器。此外，多路复用器耦合到指令模块并且基于控制字段来控制，以选择MMSE模块或MRC模块中的至少一个。

62. 发明申请

US20090245422A1 METHOD AND SYSTEM FOR TRANSMIT UPSAMPLING VIA IFFT 有权
标题翻译：通过IFFT发送UPS的方法和系统
公开(公告)号：US20090245422A1
公开(公告)日：2009-10-01
申请号：US12408631
申请日：2009-03-20
申请人： Hemanth Sampath , Sunil K. Kandukuri Narayan
发明人： Hemanth Sampath , Sunil K. Kandukuri Narayan
IPC分类号： H04L27/12
CPC分类号： H04L27/2628 , H04L27/2644
摘要： A technique for eliminating from or reducing the complexity of an upsampler/interpolator of a transmit system. In general, the technique involves configuring an IFFT to perform both the conversion of a modulated signal from frequency to time domain, and at least a portion of the upsampling from the first sampling rate towards the sampling rate of a DAC. In one embodiment, the IFFT is configured to have a bandwidth substantially equal to the sampling rate of a DAC. In this embodiment, the upsampler/interpolator may be totally eliminated. In another embodiment, the IFFT is configured to have a bandwidth that is greater than the first sampling rate of the modulated signal, and lower than the sampling rate of the DAC. In this embodiment, a simpler upsampler/interpolator may be employed to perform the remaining upsampling from the IFFT bandwidth to the sampling rate of the DAC.
摘要翻译：用于消除或降低发射系统的上采样器/内插器的复杂性的技术。通常，该技术涉及配置IFFT以执行调制信号从频域到时域的转换以及从第一采样速率向DAC的采样速率的上采样的至少一部分。在一个实施例中，IFFT被配置为具有基本上等于DAC的采样率的带宽。在本实施例中，可以完全消除上采样器/内插器。在另一个实施例中，IFFT被配置为具有大于调制信号的第一采样率的带宽，并且低于DAC的采样率。在该实施例中，可以采用更简单的上采样器/内插器来执行从IFFT带宽到DAC的采样率的剩余上采样。

63. 发明申请

US20090245230A1 COMPENSATING FOR DRIFTS OCCURRING DURING SLEEP TIMES IN ACCESS TERMINALS 有权
标题翻译：对接入终端中的休眠时间发生的升级进行补偿
公开(公告)号：US20090245230A1
公开(公告)日：2009-10-01
申请号：US12407467
申请日：2009-03-19
申请人： Hemanth Sampath , Ravi Palanki , Jeremy H. Lin , Tamer A. Kadous
发明人： Hemanth Sampath , Ravi Palanki , Jeremy H. Lin , Tamer A. Kadous
IPC分类号： H04J3/06 , H04W68/00
CPC分类号： H04W52/0274 , Y02D70/1222 , Y02D70/1242 , Y02D70/1262 , Y02D70/142 , Y02D70/146
摘要： A method and apparatus are presented for compensating drifts in access terminals occurring during a sleep time. The method includes determining whether a sleep time exceeds a threshold, buffering time domain samples containing acquisition pilots and a paging channel, powering down RF circuitry in the access terminal after buffering samples, processing the samples to compensate for drift, and determining whether the access terminal was paged based upon the processed samples. The apparatus includes a digital front end, an FFT engine coupled to the digital front end, a symbol buffer coupled to the FFT engine, a processor coupled to the digital front end, FFT engine, and symbol buffer, and a memory coupled to the processor, the memory further comprising instructions for executing the method.
摘要翻译：提出一种用于补偿在睡眠时间期间发生的接入终端中的漂移的方法和装置。该方法包括：确定休眠时间是否超过阈值，缓冲包含采集导频的时域采样和寻呼信道，在缓冲采样之后对接入终端中的RF电路进行供电，处理采样以补偿漂移，以及确定接入终端根据加工样品进行分页。该装置包括数字前端，耦合到数字前端的FFT引擎，耦合到FFT引擎的符号缓冲器，耦合到数字前端的处理器，FFT引擎和符号缓冲器以及耦合到处理器的存储器所述存储器还包括用于执行所述方法的指令。

64. 发明申请

US20080235311A1 SIMPLIFIED EQUALIZATION FOR CORRELATED CHANNELS IN OFDMA 有权
标题翻译： OFDMA中相关通道的简化均衡
公开(公告)号：US20080235311A1
公开(公告)日：2008-09-25
申请号：US12052248
申请日：2008-03-20
申请人： Petru Cristian Budianu , Hemanth Sampath , Alexei Gorokhov , Dhananjay A. Gore
发明人： Petru Cristian Budianu , Hemanth Sampath , Alexei Gorokhov , Dhananjay A. Gore
IPC分类号： G06F17/17
CPC分类号： H04L5/023 , H04L25/0232 , H04L25/0244 , H04L25/03019 , H04L27/2647 , H04L2025/03414 , H04L2025/03426
摘要： Systems and methodologies are described that facilitate equalization of received signals in a wireless communication environment. Multiple transmit and/or receive antennas and utilize MIMO technology to enhance performance. A single tile of transmitted data, including a set of modulation symbols, can be received at multiple receive antennas, resulting in multiple tiles of received modulation symbols. Corresponding modulation symbols from multiple received tiles can be processed as a function of channel and interference estimates to generate a single equalized modulation symbol. Typically, the equalization process is computationally expensive. However, the channels are highly correlated. This correlation is reflected in the channel estimates and can be utilized to reduce complex equalization operations. In particular, a subset of the equalizers can be generated based upon the equalizer function and the remainder can be generated using interpolation. In addition, the equalizer function itself can be simplified.
摘要翻译：描述了促进无线通信环境中的接收信号的均衡的系统和方法。多个发射和/或接收天线并利用MIMO技术来提高性能。可以在多个接收天线处接收包括一组调制符号的传输数据的单个瓦片，从而导致接收到的调制符号的多个瓦片。来自多个接收瓦片的相应调制符号可以作为信道和干扰估计的函数来处理，以生成单个均衡调制符号。通常，均衡过程在计算上是昂贵的。然而，这些渠道是高度相关的。该相关性反映在信道估计中，并且可以用于减少复数均衡操作。特别地，可以基于均衡器功能生成均衡器的子集，并且可以使用插值来生成余数。此外，均衡器功能本身可以简化。

65. 发明申请

US20080182585A1 DEMODULATION OF A SUBSET OF AVAILABLE LINK ASSIGNMENT BLOCKS 有权
标题翻译：可链接分配块的解析
公开(公告)号：US20080182585A1
公开(公告)日：2008-07-31
申请号：US12022085
申请日：2008-01-29
申请人： Ravi Palanki , Alexei Gorokhov , Hemanth Sampath
发明人： Ravi Palanki , Alexei Gorokhov , Hemanth Sampath
IPC分类号： H04Q7/20
CPC分类号： H04W48/12 , H04W76/27
摘要： Systems and methodologies are described that facilitate assigning indices to link assignment blocks (LABs) communicated via a downlink. Indices in a first subset are allocated to shared LABs, which are decoded by a plurality of access terminals. Indices in a second subset are assigned to unshared LABs, which are each intended for a particular recipient access terminal. Assignment of an index for each unshared LAB can be based upon a hash of an identifier corresponding to an intended recipient access terminal and/or access terminal capabilities. Moreover, an access terminal can decode LABs based upon corresponding indices. LABs with indices in a first range can be identified as shared LABs and decoded. Further, the access terminal can determine a second range of indices corresponding to unshared LABs to decode; the second range of indices includes fewer than all indices corresponding to unshared LABs in a frame sent by a base station.
摘要翻译：描述了便于将索引分配给经由下行链路传送的链路分配块（LAB）的系统和方法。第一子集中的指示被分配给由多个接入终端解码的共享LAB。第二子集中的索引被分配给未共享的LAB，每个LAB都用于特定的接收者接入终端。每个非共享LAB的索引的分配可以基于与预期接收者接入终端和/或接入终端能力相对应的标识符的散列。此外，接入终端可以基于相应的索引来解码LAB。索引在第一范围内的LAB可以被识别为共享LAB并被解码。此外，接入终端可以确定与未共享的LAB对应的索引的第二范围进行解码; 索引的第二范围包括少于由基站发送的帧中与非共享LAB相对应的全部索引。

66. 发明申请

US20070011550A1 Rank step-down for MIMO SCW design employing HARQ 有权
标题翻译：采用HARQ的MIMO SCW设计的等级降级
公开(公告)号：US20070011550A1
公开(公告)日：2007-01-11
申请号：US11441742
申请日：2006-05-25
申请人： Avneesh Agrawal , Aamod Khandekar , Hemanth Sampath , Tamer Kadous
发明人： Avneesh Agrawal , Aamod Khandekar , Hemanth Sampath , Tamer Kadous
IPC分类号： H04L1/00 , H03M13/00 , G08C25/00 , G06F11/00 , G06F11/30
CPC分类号： H04B7/0697 , H04L1/0001 , H04L1/0006 , H04L1/0026 , H04L1/1812 , H04L1/1893
摘要： Systems and methodologies are described that facilitate reducing rank (e.g., of a user device) as a number of transmissions there from increases. Such rank step-down can improve interference resistance and facilitate maintaining code rate despite transmission propagation. Additionally, rank step-down information can be encoded along with CQI information to generate a 5-bit CQI signal that can facilitate updating a user's rank upon each CQI transmission (e.g., approximately every 5 ms). The described systems and/or methods can be employed in a single code word (SCW) wireless communication environment with a hybrid automatic request (HARQ) protocol.
摘要翻译：描述的系统和方法被简化为有助于减少等级（例如，用户设备），因为其中的传输数量增加。这种排序降低可以改善抗干扰性，并且有助于保持代码率，尽管传输传播。此外，等级降级信息可以与CQI信息一起编码，以产生可以有助于在每次CQI传输（例如，大约每5ms）更新用户的等级的5比特CQI信号。所描述的系统和/或方法可以用于具有混合自动请求（HARQ）协议的单个码字（SCW）无线通信环境中。

67. 发明申请

US20070010957A1 CQI and rank prediction for list sphere decoding and ML MIMO receivers 有权
标题翻译：用于列表球体解码和ML MIMO接收机的CQI和秩预测
公开(公告)号：US20070010957A1
公开(公告)日：2007-01-11
申请号：US11441652
申请日：2006-05-25
申请人： Hemanth Sampath , Tamer Kadous
发明人： Hemanth Sampath , Tamer Kadous
IPC分类号： G06F19/00
CPC分类号： H04B7/12 , H04B1/1027 , H04B7/0417 , H04B7/063 , H04B7/0632 , H04L1/0026 , H04L1/0656 , H04L1/0675 , H04L25/03242 , H04L2025/03426
摘要： Systems and methodologies are described that facilitate integrating a list-sphere decoding design in a multiple input-multiple output (MIMO wireless communication environment. According to various aspects, optimal rank selection and CQI computation for an optimal rank can be performed in conjunction with a non-linear receiver, such as a maximum life (ML) MMSE receiver, a non-linear receiver with a list-sphere decoder, and the like. Optimal rank selection can be performed using a maximum rank selection protocol, a channel capacity-based protocol, or any other suitable protocol that facilitates rank selection, and CQI information can be generated based in part on effective SNRs determined with regard to a selected optimal rank.
摘要翻译：描述了有助于将多个输入多输出（MIMO无线通信环境）中的列表球体解码设计进行集成的系统和方法，根据各个方面，最佳秩选择和最佳秩的CQI计算可以结合非 - 线性接收机，例如最大寿命（ML）MMSE接收机，具有列表球体解码器的非线性接收机等。最佳秩选择可以使用最大秩选择协议，基于信道容量的协议或有助于等级选择的任何其它合适的协议，并且可以部分地基于针对所选择的最优等级确定的有效SNR来生成CQI信息。

68. 发明申请

US20060286974A1 Adaptive sectorization in cellular systems 有权
公开(公告)号：US20060286974A1
公开(公告)日：2006-12-21
申请号：US11260895
申请日：2005-10-27
申请人： Dhananjay Gore , Alexei Gorokhov , Hemanth Sampath , Tingfang Ji , Tamer Kadous
发明人： Dhananjay Gore , Alexei Gorokhov , Hemanth Sampath , Tingfang Ji , Tamer Kadous
IPC分类号： H04Q7/20
CPC分类号： H04W16/00 , H04B7/0408 , H04B7/0695 , H04W16/24 , H04W16/28 , H04W72/046 , H04W72/085
摘要： Apparatuses and methodologies are described that enhance performance in a wireless communication system using beamforming transmissions. According to one aspect, a set of transmit beams are defined that simultaneously provides for space division multiplexing, multiple-input multiple output (MIMO transmission and opportunistic beamforming. The addition of a wide beam guarantees a minimum acceptable performance for all user devices.

69. 发明申请

US20060285585A1 Method and apparatus for optimum selection of MIMO and interference cancellation 有权
标题翻译：用于MIMO和干扰消除的最佳选择的方法和装置
公开(公告)号：US20060285585A1
公开(公告)日：2006-12-21
申请号：US11454762
申请日：2006-06-15
申请人： Hemanth Sampath
发明人： Hemanth Sampath
IPC分类号： G01N37/00 , H04B17/00
CPC分类号： H04B7/0632 , H04B7/063 , H04B7/0817 , H04L1/0026 , H04L1/06 , H04L25/0206
摘要： Systems and methodologies are described that facilitate performing interference nulling and rank prediction in an access terminal. Multiple receiver demodulator types may be implemented at the access terminal, and an interference covariance matrix may be estimated thereat. SNRs may be calculated for the various receiver demodulator types, and an optimum rank and associated CQI information may be identified and generated, respectively, which information may then be transmitted to an access point. At least one of the receiver demodulator types may perform an interference nulling protocol. For example, the receiver demodulator types may comprise at least one minimum mean-squared error interference-nulling (MMSE-IN) demodulator, along with and one or more of a maximal ratio combining (MRC) demodulator and a minimum mean-squared error (MMSE) demodulator.
摘要翻译：描述了有助于在接入终端中执行干扰归零和秩预测的系统和方法。可以在接入终端实现多个接收机解调器类型，并且可以在其上估计干扰协方差矩阵。可以针对各种接收机解调器类型计算SNR，并且可以分别识别和生成最佳等级和相关联的CQI信息，然后可以将哪些信息发送到接入点。至少一个接收机解调器类型可以执行干扰归零协议。例如，接收机解调器类型可以包括至少一个最小均方误差干扰消隐（MMSE-IN）解调器，以及最大比组合（MRC）解调器和最小均方误差（MRC）的一个或多个 MMSE）解调器。

70. 发明申请

US20060188034A1 System and method for multiple signal carrier time domain channel estimation 失效
公开(公告)号：US20060188034A1
公开(公告)日：2006-08-24
申请号：US11402597
申请日：2006-04-12
申请人： Hemanth Sampath
发明人： Hemanth Sampath
IPC分类号： H04K1/10
CPC分类号： H04L25/0232 , H04L25/022 , H04L25/0222 , H04L27/2647
摘要： The present invention provides a method of characterizing a frequency response of a transmission channel between a transceiver and a subscriber unit. The method includes once per predetermined interval of time, the transceiver transmitting a signal including multiple carriers, a plurality of the carriers including training symbols, a plurality of the carriers including information symbols. The subscriber unit generates frequency response estimates at the frequencies of the carriers including training symbols, each interval of time. The frequency response estimates are converted into a time domain response generating an impulse response once per interval of time. The impulse responses are filtered over a plurality of intervals of time. A channel profile is determined from the filtered impulse responses. The channel profile is converted to the frequency domain generating a channel interpolator. The characterized frequency response is generated from the channel interpolator and the frequency response estimates. The filtering can include averaging the impulse responses over a plurality of intervals of time, accumulating the impulse responses over a plurality of intervals of time, or weighted averaging of the impulse responses over a plurality of intervals of time. The weighted averaging can be dependent upon a phase error between the impulse responses, and/or an amplitude error between the impulse responses.

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