公开(公告)号：US08422570B2

公开(公告)日：2013-04-16

申请号：US11665311

申请日：2005-10-13

申请人： Norman C. Beaulieu ,  Peng Tan

发明人： Norman C. Beaulieu ,  Peng Tan

IPC分类号： H04K1/10

CPC分类号： H04L27/2605

摘要： A discrete cosine transform (DCT)-based orthogonal frequency-division multiplexing (OFDM) system is provided with a zero-padding guard interval and MMSE reception. The performance of the DCT-OFDM system with the zero-padding guard interval scheme and the minimum mean-square error (MMSE) receiver over time-varying multipath Rayleigh fading channels is investigated. The results show that employing the proposed DCT-OFDM system rather than the conventional DFT-OFDM system can provide better bit error rate performance in practical systems, by as much as 6 dB in signal-to-noise ratio.

摘要翻译： 基于离散余弦变换（DCT）的正交频分复用（OFDM）系统具有零填充保护间隔和MMSE接收。 研究了具有零填充保护间隔方案的DCT-OFDM系统和随时间变化多径瑞利衰落信道的最小均方误差（MMSE）接收机的性能。 结果表明，采用所提出的DCT-OFDM系统而不是传统的DFT-OFDM系统可以在实际系统中提供更好的误码率性能，在信噪比方面高达6dB。

公开(公告)号：US20110128994A1

公开(公告)日：2011-06-02

申请号：US12530562

申请日：2008-03-07

申请人： Norman C. Beaulieu ,  Hua Shao

发明人： Norman C. Beaulieu ,  Hua Shao

IPC分类号： H04B1/69 ,  H04L27/06

CPC分类号： H04B1/719 ,  H04B1/71637

摘要： A novel ultra-wide bandwidth receiver structure dubbed the “zonal” receiver is proposed to detect time-hopping ultra-wide bandwidth signals in multiple access interference channels. The zonal receiver outperforms the conventional matched filter ultra-wide bandwidth receiver and the recently proposed soft-limiting ultra-wide bandwidth receiver when only MAI is present, or AWGN is negligible compared to MAI. In more practical mixed MAI-plus-AWGN environments, the zonal ultra-wide bandwidth receiver achieves better performance than the conventional matched filter ultra-wide bandwidth receiver, the recently proposed soft-limiting ultra-wide bandwidth receiver, and the recently proposed adaptive threshold soft-limiting ultra-wide bandwidth receiver. In multipath fading UWB channels, a new Rake receiver based on the zonal UWB receiver design has been proposed, this new Rake receiver can achieve better BER performance than the conventional matched filter based Rake receiver.

摘要翻译： 提出了一种称为“区域”接收机的新型超宽带宽接收机结构，用于检测多接入干扰信道中的跳时超宽带宽信号。 区域接收机优于传统的匹配滤波器超宽带宽接收机和最近提出的仅限于MAI的软限幅超宽带宽接收机，或者与MAI相比，AWGN可以忽略不计。 在更实际的混合MAI-plus-AWGN环境中，区带超宽带宽接收机实现了比传统的匹配滤波器超宽带宽接收机更好的性能，最近提出的软限制超宽带宽接收机和最近提出的自适应阈值 软限幅超宽带宽接收机。 在多径衰落UWB信道中，已经提出了基于区带UWB接收机设计的新的Rake接收机，这种新的Rake接收机可以比常规的基于匹配滤波器的Rake接收机获得更好的BER性能。

公开(公告)号：US20100008401A1

公开(公告)日：2010-01-14

申请号：US12438262

申请日：2007-08-23

申请人： Norman C. Beaulieu

发明人： Norman C. Beaulieu

IPC分类号： H04B1/69

CPC分类号： H04B1/71637 ,  H04B1/719 ,  H04B2001/6908

摘要： A novel receiver structure is proposed for detecting a time-hopping νltrat-wide bandwidth signal in the presence of multiple access interference. The proposed structure achieves better bit error rate performance than the conventional matched receiver when operating in multiple access interference. When operating in a multiple access interference-plus-Gaussian-noise environment, the receiver structure outperforms the conventional matched filter receiver for moderate to large values of signal-to-noise ratio. A receiver structure with adaptive limiting threshold is further proposed to ensure the performance of the soft-limiting receiver always meets or surpasses the performance of the conventional UWB receiver for all values of signal-to-noise ratio.

摘要翻译： 提出了一种新颖的接收机结构，用于在存在多址干扰的情况下检测跳跃的nultrat宽带宽信号。 当在多址接入干扰下工作时，所提出的结构实现比传统匹配接收机更好的误码率性能。 当在多址干扰加 - 高斯噪声环境中工作时，接收机结构优于传统的匹配滤波器接收机，以获得中等到大的信噪比值。 进一步提出具有自适应限制阈值的接收机结构，以确保软限幅接收机的性能总是满足或超过传统UWB接收机对于所有信噪比值的性能。

公开(公告)号：US20090092058A1

公开(公告)日：2009-04-09

申请号：US12282119

申请日：2007-03-07

申请人： Norman C. Beaulieu ,  Yunfei Chen

发明人： Norman C. Beaulieu ,  Yunfei Chen

IPC分类号： H04J1/16

CPC分类号： H04L25/03197 ,  H04B1/71637 ,  H04L25/03292

摘要： Novel non-data-aided maximum likelihood estimators for the delays and the attenuations in an ultra-wide bandwidth channel are proposed. Numerical results show that these new estimators outperform the previous non-data-aided maximum likelihood channel estimators derived in the literature. Moreover, in some cases, the performances of the new non-data-aided estimators approach those of the data-aided estimators, enabling us to reduce the overhead expense of pilot symbols.

摘要翻译： 提出了用于超宽带宽信道中的延迟和衰减的新型非数据辅助最大似然估计器。 数值结果表明，这些新的估计值优于文献中推导的以前的非数据辅助最大似然信道估计。 此外，在某些情况下，新的非数据辅助估计器的性能接近数据辅助估计器的性能，使我们能够减少导频符号的间接费用。

公开(公告)号：US08654899B2

公开(公告)日：2014-02-18

申请号：US11665188

申请日：2005-10-12

申请人： Norman C. Beaulieu ,  Yunfei Chen

发明人： Norman C. Beaulieu ,  Yunfei Chen

IPC分类号： H03D1/00

CPC分类号： H04B1/76 ,  H04L25/023

摘要： Pilot symbol assisted modulation (PSAM) techniques for Rayleigh and Rician fading channels are derived. Previous techniques implement PSAM signal detectors as an ad-hoc design, using pilot symbols to first estimate channel gain, and then using channel gain estimates in a conventional coherent detector to make data decisions. Although this structure may be effective for binary phase shift keying in Rayleigh fading, it is suboptimal for Rician fading and for 16-ary quadrature amplitude modulation in Rayleigh fading. According to techniques disclosed herein, a PSAM signal detector jointly processes pilot symbols and data symbols. The performance of signal detectors according to embodiments of the invention is analyzed and compared with that of conventional detectors. Numerical results are presented to show that the performance gain of a proposed new PSAM signal detector over conventional PSAM detectors can be as much as 2 or 3 dB for Rician fading in some cases.

摘要翻译： 导出用于瑞利和Rician衰落信道的导频符号辅助调制（PSAM）技术。 以前的技术将PSAM信号检测器实现为ad-hoc设计，使用导频符号来首先估计信道增益，然后在常规相干检测器中使用信道增益估计来做出数据决定。 虽然这种结构对于瑞利衰落中的二进制相移键控可能是有效的，但对于瑞利衰落和瑞利衰落中的16进制正交幅度调制来说，这不是最佳的。 根据本文公开的技术，PSAM信号检测器联合处理导频符号和数据符号。 根据本发明的实施例的信号检测器的性能被分析并与常规检测器的性能进行比较。 提出数值结果表明，在某些情况下，对于Rician衰落，所提出的新的PSAM信号检测器在常规PSAM检测器上的性能增益可以高达2或3dB。

公开(公告)号：US08442093B2

公开(公告)日：2013-05-14

申请号：US12438262

申请日：2007-08-23

申请人： Norman C. Beaulieu

发明人： Norman C. Beaulieu

IPC分类号： H04B1/00

CPC分类号： H04B1/71637 ,  H04B1/719 ,  H04B2001/6908

摘要： A novel receiver structure is proposed for detecting a time-hopping ultra-wide bandwidth signal in the presence of multiple access interference. The proposed structure achieves better bit error rate performance than the conventional matched receiver when operating in multiple access interference. When operating in a multiple access interference-plus-Gaussian-noise environment, the receiver structure outperforms the conventional matched filter receiver for moderate to large values of signal-to-noise ratio. A receiver structure with adaptive limiting threshold is further proposed to ensure the performance of the soft-limiting receiver always meets or surpasses the performance of the conventional UWB receiver for all values of signal-to-noise ratio.

摘要翻译： 提出了一种新颖的接收机结构，用于在存在多址干扰的情况下检测跳时超宽带宽信号。 当在多址接入干扰下工作时，所提出的结构实现比传统匹配接收机更好的误码率性能。 当在多址干扰加 - 高斯噪声环境中工作时，接收机结构优于传统的匹配滤波器接收机，以获得中等到大的信噪比值。 进一步提出具有自适应限制阈值的接收机结构，以确保软限幅接收机的性能总是满足或超过传统UWB接收机对于所有信噪比值的性能。

公开(公告)号：US08130817B2

公开(公告)日：2012-03-06

申请号：US12282119

申请日：2007-03-07

申请人： Norman C. Beaulieu ,  Yunfei Chen

发明人： Norman C. Beaulieu ,  Yunfei Chen

IPC分类号： H04B1/00 ,  H04L27/06

CPC分类号： H04L25/03197 ,  H04B1/71637 ,  H04L25/03292

摘要： Novel non-data-aided maximum likelihood estimators for the delays and the attenuations in an ultra-wide bandwidth channel are proposed. Numerical results show that these new estimators outperform the previous non-data-aided maximum likelihood channel estimators derived in the literature. Moreover, in some cases, the performances of the new non-data-aided estimators approach those of the data-aided estimators, enabling us to reduce the overhead expense of pilot symbols.

摘要翻译： 提出了用于超宽带宽信道中的延迟和衰减的新型非数据辅助最大似然估计器。 数值结果表明，这些新的估计值优于文献中推导的以前的非数据辅助最大似然信道估计。 此外，在某些情况下，新的非数据辅助估计器的性能接近数据辅助估计器的性能，使我们能够减少导频符号的间接费用。

公开(公告)号：US20090262869A1

公开(公告)日：2009-10-22

申请号：US12439072

申请日：2007-08-31

申请人： Norman C. Beaulieu ,  Zheng Du

发明人： Norman C. Beaulieu ,  Zheng Du

IPC分类号： H04L27/06

CPC分类号： H04B7/0854

摘要： Time variation on fading channels hinders accurate channel estimation in differential space-time modulation and deteriorates the performance. Decision-feedback differential detection is employed for block differential space-time modulation, and compared with conventional differential space-time modulation. It is observed that the proposed scheme does not suffer effective fading bandwidth expansion, as does the conventional scheme. An improved effective signal-to-noise ratio approach is proposed for analyzing the performance of the proposed scheme in time-varying flat Rayleigh fading. Theoretical analysis and simulations show the improved performance of the proposed scheme over the conventional scheme.

摘要翻译： 衰落通道的时间变化阻碍了差分时空调制中的精确信道估计，并降低了性能。 决策反馈差分检测用于块差分时空调制，与传统的差分时空调制相比较。 观察到，与常规方案一样，所提出的方案不会遭受有效的衰落带宽扩展。 提出了一种改进的有效信噪比方法，用于分析所提出的方案在时变平面瑞利衰落中的性能。 理论分析和模拟显示了所提出的方案相对于传统方案的改进的性能。