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：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：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：US07729447B2

公开(公告)日：2010-06-01

申请号：US11317409

申请日：2005-12-22

申请人： Jyh Chau Horng ,  Xuemei Ouyang ,  Chiu Ngo

发明人： Jyh Chau Horng ,  Xuemei Ouyang ,  Chiu Ngo

IPC分类号： H04L27/00

CPC分类号： H04B7/0669 ,  H04L1/0071 ,  H04L1/04 ,  H04L1/06 ,  H04L5/0023 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0083

摘要： A MIMO communication system implements an interleaver design with multiple encoders for more than two transmit antennas for high throughput WLAN communication systems. Multiple encoders are utilized in the transmitter and multiple decoders are utilized in the receiver, wherein each encoder operates at lower clock speed than would be necessary with a single encoder. In conjunction with using multiple encoders, a modified interleaving function for each spatial stream processing allows fully exploring the diversity gains. The provided interleaving function is suitable for transmitter architectures with multiple encoders. Similarly, a modified de-interleaving function is provided that is suitable for receiver architectures with multiple decoders.

摘要翻译： MIMO通信系统对于高吞吐量WLAN通信系统实现用于多于两个发射天线的多个编码器的交织器设计。 在发射机中使用多个编码器，在接收机中使用多个解码器，其中每个编码器以比单个编码器需要的更低的时钟速度工作。 结合使用多个编码器，用于每个空间流处理的修改的交织功能允许充分地探索分集增益。 所提供的交织功能适用于具有多个编码器的发射机架构。 类似地，提供了适用于具有多个解码器的接收机架构的修改的去交织功能。

公开(公告)号：US07660232B2

公开(公告)日：2010-02-09

申请号：US11314929

申请日：2005-12-20

申请人： Xuemei Ouyang ,  Chiu Ngo

发明人： Xuemei Ouyang ,  Chiu Ngo

IPC分类号： H04J11/00

CPC分类号： H04L27/2608 ,  H03M13/271 ,  H04L1/0041 ,  H04L1/0059 ,  H04L1/0068 ,  H04L1/0071 ,  H04L1/06

摘要： A MIMO wireless system includes a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing column skip operation and frequency rotation, to increase diversity of the wireless system. The MIMO wireless system also includes a receiver that has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.

摘要翻译： MIMO无线系统包括发射机，其具有将比特流解析为多个空间数据流的解析器和对应于多个空间数据流的多个交织器，其中每个交织器通过执行列跳过操作和频率来交织相应空间数据流中的比特 旋转，以增加无线系统的多样性。 MIMO无线系统还包括具有解交织器的解交织器的接收机，其对由发射机发送的空间比特流进行解交织。

公开(公告)号：US10270511B2

公开(公告)日：2019-04-23

申请号：US11719490

申请日：2005-11-16

申请人： Xuemei Ouyang

发明人： Xuemei Ouyang

IPC分类号： H04B7/06 ,  H04B7/0417 ,  H04N19/102 ,  H04N19/37 ,  H04N19/164 ,  H04N19/187 ,  H04N19/39 ,  H04N19/34

摘要： A system and method is provided wherein channel state information assisted MIMO transmission based on singular value decomposition (SVD) (204) (304) simplifies the decoding process. The present invention is a joint source and channel coding system and method for robust wireless multimedia communication. Using the fact that SVD redistributes the channel energy in a descending way, the base layer of the Fine-Grained-Scalability (FGS) (208) is mapped to the highest signal-to-noise (SNR) path to obtain better protection, while other enhancement layers are mapped to other paths such that less important layers are mapped to lower SNR paths in the SVD-decomposed channel. A multiple description code (MDC) (207) is also used in this manner such that at least one coded stream is provided more protection because of the high SNR. This invention pertains to any MIMO based wireless multimedia communication system.