公开(公告)号：US20070248174A1

公开(公告)日：2007-10-25

申请号：US11569009

申请日：2005-05-10

申请人： Monisha Ghosh ,  Xuemei Ouyang

发明人： Monisha Ghosh ,  Xuemei Ouyang

IPC分类号： H04Q11/00

CPC分类号： H04L25/0226 ,  H04L1/0057 ,  H04L1/0071 ,  H04L1/0072 ,  H04L1/04 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04L27/2607 ,  H04L27/2613 ,  H04L27/2657

摘要： A method and associated systems for implementing MIMO communication systems are disclosed. The systems comprise at least one encoder (120a, 120b) for Reed-Solomon encoding a corresponding input data stream of data packets; at least one interleaver (124a, 124b) for interleaving bits of a corresponding encoded input data stream, at least one mapper (128a, 128b) for mapping the interleaved bits of a corresponding encoded input data stream, at least one inverse FFT (132a, 132b) for determining transforms of the mapped interleaved bits of a corresponding encoded bit stream, at least one cyclic prefix unit (136a, 136b) for determining a cyclic prefix of the transformed mapped interleaved bits of a corresponding encoded bit stream; and, at least one pulse shaper (140a, 140b) for shaping pulses of a corresponding encoded bit stream and means for dividing a data stream into a plurality of input data steams, the input data streams associated with a corresponding communication channel. In addition, the method provides a training sequence 700 that imposes minimal overhead on data transmission.

摘要翻译： 公开了一种用于实现MIMO通信系统的方法和相关系统。 所述系统包括至少一个用于Reed-Solomon编码数据分组的对应输入数据流的编码器（120a，120b）; 至少一个交织器（124a，124b），用于交织对应的编码输入数据流的比特，至少一个映射器（128a，128b），用于映射对应的编码输入数据流的交织比特，至少一个反相 FFT（132a，132b），用于确定相应编码比特流的映射交织比特的变换;至少一个循环前缀单元（136a，136b），用于确定相应编码比特流的经变换的映射交织比特的循环前缀 编码比特流; 以及至少一个脉冲整形器（140a，140b），用于整形对应的编码比特流的脉冲以及用于将数据流分成多个输入数据流的装置，所述输入数据流与对应的通信信道相关联。 此外，该方法提供了对数据传输施加最小开销的训练序列700。

公开(公告)号：US20090190682A1

公开(公告)日：2009-07-30

申请号：US11571366

申请日：2005-06-27

申请人： Xuemei Ouyang ,  Pen Li ,  Monisha Ghosh

发明人： Xuemei Ouyang ,  Pen Li ,  Monisha Ghosh

IPC分类号： H04L23/02 ,  H04K1/10

CPC分类号： H04L1/06 ,  H04L25/03197

摘要： A system and method for a simplified Maximum Likelihood (ML) decoding (203) for MIMO systems is provided. The full ML decoding gives the lower bound of the decoding for CC coded MIMO systems. However, the computation cost is too high to be implemented in real system. Many alternative methods have been proposed for the decoding. Among them, weighted Zero Forcing (WZF) is one that can give affordable performance with reasonable computation complexity but there are several dB of performance gap for the WZF decoding and ML decoding. This present invention discloses a decoding system and method having improved performance over WZF decoding with affordable implementation complexity.

摘要翻译： 提供了一种用于MIMO系统的简化最大似然（ML）解码（203）的系统和方法。 完整的ML解码为CC编码的MIMO系统提供了解码的下限。 然而，计算成本太高，无法在实际系统中实现。 已经提出了用于解码的许多替代方法。 其中，加权零强制（WZF）是能够以合理的计算复杂度提供负担得起的性能，但对于WZF解码和ML解码，存在几dB的性能差距。 本发明公开了一种具有可靠实现复杂度的WZF解码性能提高的解码系统和方法。

公开(公告)号：US07269216B2

公开(公告)日：2007-09-11

申请号：US10139196

申请日：2002-05-06

申请人： Rodney A. Kennedy ,  Dino Miniutti ,  Xuemei Ouyang ,  Monisha Ghosh

发明人： Rodney A. Kennedy ,  Dino Miniutti ,  Xuemei Ouyang ,  Monisha Ghosh

IPC分类号： H03H7/30 ,  H04L27/06

CPC分类号： H04L25/0305 ,  H04L2025/03382

摘要： A magnitude only equalizer equalizes a magnitude of a received wireless signal without regard to phase distortions introduced, and transmits the magnitude equalized signal to a timing recovery loop for improved correlation peak detection in a sync based timing recovery scheme. A channel equalizer receiving the output signal from the timing recovery loop equalizes the signal and corrects any phase distortions introduced by the magnitude only equalizer. The magnitude only equalizer includes at least one filter utilizing only real coefficients and constrained such that the direct term of the overall filter structure within the magnitude only equalizer is unity.

摘要翻译： 仅幅度均衡器不考虑引入的相位失真来均衡接收到的无线信号的幅度，并将幅度均衡的信号发送到定时恢复环路，以在基于同步的定时恢复方案中改善相关峰值检测。 接收来自定时恢复环路的输出信号的信道均衡器对信号进行均衡，并校正由仅量大均衡器引入的任何相位失真。 仅幅度均衡器包括至少一个仅使用实数系数并被约束的滤波器，使得仅在幅度均衡器内的整个滤波器结构的直接项是一致的。

公开(公告)号：US20060077944A1

公开(公告)日：2006-04-13

申请号：US10538114

申请日：2003-12-08

申请人： Monisha Ghosh ,  Xuemei Ouyang

发明人： Monisha Ghosh ,  Xuemei Ouyang

IPC分类号： H04B7/208

CPC分类号： H04B7/06 ,  H04L1/0041 ,  H04L1/0071 ,  H04L1/06 ,  H04L27/2602 ,  H04L27/2626

摘要： Disclosed is a system and method for providing backward compatible transmitter diversity in an orthogonal frequency division modulated (OFDM) communication system. According to one aspect of the invention, a method for providing backward compatible transmitter diversity includes the steps of: receiving an input data bit stream; transforming it into an OFDM symbol stream comprised of even and odd symbols; dividing the OFDM symbol stream into a first symbol sub-stream and a second symbol sub-stream; processing the first symbol sub-stream by a first processing block to output a first processed symbol sub-stream; processing the second symbol sub-stream by a second processing block to output a second processed symbol sub-stream; transmitting the first processed symbol sub-stream from a first diversity antenna; and transmitting the second processed symbol sub-stream from a second diversity antenna and both are transmitted over non-overlapping frequencies.

摘要翻译： 公开了一种用于在正交频分调制（OFDM）通信系统中提供向后兼容的发射机分集的系统和方法。 根据本发明的一个方面，一种用于提供向后兼容的发射机分集的方法包括以下步骤：接收输入数据比特流; 将其转换成由偶数和奇数符号组成的OFDM符号流; 将OFDM符号流划分为第一符号子流和第二符号子流; 通过第一处理块处理第一符号子流以输出第一处理符号子流; 通过第二处理块处理所述第二符号子流，以输出第二处理符号子流; 从第一分集天线发射所述第一处理符号子流; 并且从第二分集天线发送第二处理符号子流，并且在非重叠频率上发送二者。

公开(公告)号：US07724834B2

公开(公告)日：2010-05-25

申请号：US11571366

申请日：2005-06-27

申请人： Xuemei Ouyang ,  Pen Li ,  Monisha Ghosh

发明人： Xuemei Ouyang ,  Pen Li ,  Monisha Ghosh

IPC分类号： H04L5/12

CPC分类号： H04L1/06 ,  H04L25/03197

摘要： A system and method for a simplified Maximum Likelihood (ML) decoding (203) for MIMO systems is provided. The full ML decoding gives the lower bound of the decoding for CC coded MIMO systems. However, the computation cost is too high to be implemented in real system. Many alternative methods have been proposed for the decoding. Among them, weighted Zero Forcing (WZF) is one that can give affordable performance with reasonable computation complexity but there are several dB of performance gap for the WZF decoding and ML decoding. This present invention discloses a decoding system and method having improved performance over WZF decoding with affordable implementation complexity.

摘要翻译： 提供了一种用于MIMO系统的简化最大似然（ML）解码（203）的系统和方法。 完整的ML解码为CC编码的MIMO系统提供了解码的下限。 然而，计算成本太高，无法在实际系统中实现。 已经提出了用于解码的许多替代方法。 其中，加权零强制（WZF）是能够以合理的计算复杂度提供负担得起的性能，但对于WZF解码和ML解码，存在几dB的性能差距。 本发明公开了一种具有可靠实现复杂度的WZF解码性能提高的解码系统和方法。

公开(公告)号：US07411928B2

公开(公告)日：2008-08-12

申请号：US10537221

申请日：2003-11-18

申请人： Monisha Ghosh ,  Xuemei Ouyang

发明人： Monisha Ghosh ,  Xuemei Ouyang

IPC分类号： H04Q7/00

CPC分类号： H04L1/0071 ,  H04B7/0854 ,  H04L1/0054 ,  H04L1/06 ,  H04L27/2601

摘要： Multiple input multiple output (MIMO) systems are candidates for higher data rate wireless communication systems. Currently, for a single input single output (SISO) 1802.11a system can provide a transmission data rate up to 54 Mbps. The present invention is a 2 by 2 Multiple In Multiple Out (MIMO) system having a decoding apparatus that increases the data rate to over 100 Mbps but at a computation cost about the same as for optimal decoding for a SISO system and 1/64 of the optimal decoding for a 2 by 2 MIMO system. At a bit error rate (BER) of 10-4 level, the 2 by 2 MIMO system of the present invention provides double the transmission data rate of the SISO system with approximately the same signal to noise ratio (SNR).

摘要翻译： 多输入多输出（MIMO）系统是更高数据速率无线通信系统的候选者。 目前，对于单输入单输出（SISO）1802.11a系统，可提供高达54 Mbps的传输数据速率。 本发明是一种具有将数据速率提高到100Mbps以上的解码装置的2乘2多输出多输出系统，其计算成本与用于SISO系统的最佳解码相同，计算成本约为1/64 2×2 MIMO系统的最优解码。 在10-4级别的误码率（BER）的情况下，本发明的2×2 MIMO系统以大致相同的信噪比（SNR）提供SISO系统的传输数据速率的两倍。

公开(公告)号：US07236548B2

公开(公告)日：2007-06-26

申请号：US10185385

申请日：2002-06-28

申请人： Monisha Ghosh ,  Joseph Patrick Meehan ,  Xuemei Ouyang

发明人： Monisha Ghosh ,  Joseph Patrick Meehan ,  Xuemei Ouyang

IPC分类号： H04B7/10 ,  H04L1/02

CPC分类号： H04L1/0059 ,  H04B7/0885 ,  H04L1/0054 ,  H04L1/0071 ,  H04L1/06 ,  H04L25/0204 ,  H04L27/2647

摘要： Bit level, rather than symbol level, diversity combining is employed within a wireless communications receiver. Channel estimates and bit metrics are separately computed for signals received by different antenna elements. Bit metrics are calculated by determining a least squares cumulative difference between all bits within the received symbol and corresponding bits within constellation symbols as modified by the channel estimate. The separately-determined bit metrics are then combined for decoding. Performance improvements over both single antenna systems and multiple antenna systems with symbol level diversity combining are achieved.

摘要翻译： 在无线通信接收机内采用比特级而不是符号级，分集组合。 针对由不同天线元件接收的信号，分别计算信道估计和比特度量。 通过确定接收符号内的所有比特和由信道估计修改的星座符号内的相应比特来计算比特度量。 然后将单独确定的位度量组合用于解码。 实现了具有符号级分集组合的单天线系统和多天线系统的性能改进。

公开(公告)号：US09397779B2

公开(公告)日：2016-07-19

申请号：US12812640

申请日：2009-01-23

申请人： Vasanth Gaddam ,  Monisha Ghosh ,  Jianfeng Wang

发明人： Vasanth Gaddam ,  Monisha Ghosh ,  Jianfeng Wang

IPC分类号： H04W40/00 ,  H04J11/00 ,  H04B7/00 ,  H04L27/28 ,  H04L1/00 ,  H04L1/18 ,  H04L5/00

CPC分类号： H04L1/0001 ,  H04L1/0071 ,  H04L1/1867 ,  H04L5/0007 ,  H04L5/0044

摘要： A first wireless device communicates data to a second wireless device. The first wireless device employs at least one of a first interleaving scheme and a first sub-carrier mapping scheme to produce a first data packet from a first plurality of data bits, and transmits the first data packet to the second wireless device. When the first data packet is not received correctly by the second wireless device, then the first wireless device employs at least one of a second interleaving scheme and a second sub-carrier mapping scheme to create a second data packet from the first plurality of data bits, and transmits the second data packet to the second wireless device.

摘要翻译： 第一无线设备将数据传送到第二无线设备。 第一无线设备采用第一交织方案和第一子载波映射方案中的至少一个从第一多个数据比特产生第一数据分组，并将第一数据分组发送到第二无线设备。 当第二无线设备未正确接收到第一数据分组时，第一无线设备采用第二交织方案和第二子载波映射方案中的至少一个从第一多个数据比特中产生第二数据分组 ，并将第二数据分组发送到第二无线设备。

公开(公告)号：US08773994B2

公开(公告)日：2014-07-08

申请号：US13263136

申请日：2010-03-24

申请人： Monisha Ghosh ,  Vasanth R. Gaddam

发明人： Monisha Ghosh ,  Vasanth R. Gaddam

IPC分类号： G01R31/08

CPC分类号： H04L1/0025 ,  H04B7/0613 ,  H04L7/042

摘要： A method (200) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S210); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S220); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.

摘要翻译： 一种用于在无线通信网络中发送传输模式的信令的方法（200）包括：选择与传输设备的传输模式对应的签名序列（S210）; 针对所述发送装置中的每个天线形成基于所选择的签名序列的同步字段，其中所述同步字段包括在前导码中（S220）; 并且从发送装置中的每个天线发送包括前导码的数据帧。

公开(公告)号：US20130337842A1

公开(公告)日：2013-12-19

申请号：US14001683

申请日：2012-02-24

申请人： Dong Wang ,  Monisha Ghosh ,  Delroy Smith

发明人： Dong Wang ,  Monisha Ghosh ,  Delroy Smith

IPC分类号： H04W4/02

CPC分类号： H04W4/021 ,  A61B5/002 ,  A61B5/0022 ,  A61B5/0024 ,  A61B5/024 ,  A61B5/0402 ,  A61B5/0816 ,  G06F19/00 ,  G06F19/3418 ,  G16H40/63 ,  H04W16/20 ,  H04W48/04 ,  H04W84/18

摘要： A medical system includes one or more MBAN devices which acquire and communicate patient data. One or more medical body area network (MBAN) systems include the one or more MBAN devices communicating the patient data with a hub device via short-range wireless communication. The communication of the patient data via the short-range wireless communication being within a predefined spectrum. The hub device receives patient data communicated from the one or more MBAN devices, communicates with a central monitoring station via a longer range communication and one or more access points (AP), and determines the location of the MBAN system in reference to a healthcare facility. The one or more MBAN devices are inhibited from transmitting within the predefined spectrum when the MBAN hub device is located outside the healthcare facility.

摘要翻译： 医疗系统包括一个或多个MBAN设备，其获取并传达患者数据。 一个或多个医疗体区域网络（MBAN）系统包括一个或多个MBAN设备，通过短距离无线通信将患者数据与集线器设备通信。 通过短距离无线通信的患者数据的通信处于预定义的频谱内。 集线器设备接收从一个或多个MBAN设备传送的患者数据，经由较长距离通信和一个或多个接入点（AP）与中央监控站进行通信，并且参考医疗机构确定MBAN系统的位置 。 当MBAN集线器设备位于保健设施之外时，禁止在预定频谱内发送一个或多个MBAN设备。