公开(公告)号：US20140334421A1

公开(公告)日：2014-11-13

申请号：US14363144

申请日：2012-12-07

Applicant: Drexel University

Inventor： Guillermo Sosa ,  Kapil R. Dandekar ,  Magdalena Bielinski ,  Kevin Wanuga

IPC: H04L27/26 ,  H04W52/42 ,  H04W52/16 ,  H04L5/00

CPC classification number: H04L27/2618 ,  H04L5/0064 ,  H04L27/2615 ,  H04W52/16 ,  H04W52/42

Abstract: The problems of high peak to average power ratio (PAPR) in multi-carrier systems and throughput improvement in multi-carrier systems by PAPR-aware rate adaptive bit loading are addressed by implementing two symbol rotation-inversion algorithms that reduce the peak to average power ratio in multi carrier OFDM systems jointly with rate adaptation. The method combines the benefits of bit allocation and symbol rotation to reduce the PAPR in OFDM communication systems and thus improve system range and robustness to noise. When coupled with adaptive bit loading techniques, these PAPR remediation strategies can substantially increase link throughput. Symbol rotation results in more than one order of magnitude BER reduction for SISO OFDM and one order of magnitude reduction in MIMO OFDM.

Abstract translation: 通过PAPR感知速率自适应位负载，多载波系统中的高峰值平均功率比（PAPR）和多载波系统的吞吐量改善的问题通过实现两个符号旋转反演算法来解决，这两种算法降低了峰值对平均功率 多载波OFDM系统中的速率匹配率。 该方法结合了比特分配和符号旋转的优点，以减少OFDM通信系统中的PAPR，从而提高系统范围和噪声鲁棒性。 当与自适应位加载技术相结合时，这些PAPR修复策略可以显着增加链路吞吐量。 符号旋转导致SISO OFDM的BER降低超过一个数量级，MIMO OFDM中降低一个数量级。

公开(公告)号：US20150333943A1

公开(公告)日：2015-11-19

申请号：US14138188

申请日：2013-12-23

Applicant: DREXEL UNIVERSITY

Inventor： Richard Primerano ,  Kevin Wanuga ,  Magdalena Bielinski ,  Kapil R. Dandekar ,  Moshe Kam ,  Guillermo Sosa

IPC: H04L27/26 ,  H04L27/01 ,  H04L5/00 ,  H04L27/36

CPC classification number: H04L27/262 ,  H04B11/00 ,  H04L1/0005 ,  H04L5/0007 ,  H04L5/0046 ,  H04L27/01 ,  H04L27/2614 ,  H04L27/362 ,  Y02D70/144 ,  Y02D70/48

Abstract: A link adaptive orthogonal frequency-division multiplexed (OFDM) ultrasonic physical layer is provided that is capable of high data rate communication through metallic structures. The use of an adaptive OFDM subcarrier-based modulation technique mitigates the effects of severe frequency selective fading of the through-metal communication link and improves spectral efficiency by exploiting the slow-varying nature of the channel. To address the potential ill effects of peak-to-average power ratio (PAPR) and to make more efficient use of the power amplifiers in the system, the invention modifies and implements a symbol rotation and inversion-based PAPR reduction algorithm in the adaptive OFDM framework. This joint adaptive physical layer is capable of increasing data rates by roughly 220% in comparison to conventional narrowband techniques at average transmit powers of roughly 7 mW while constrained to a desired BER.

Abstract translation: 提供了能够通过金属结构进行高数据速率通信的链路自适应正交频分复用（OFDM）超声波物理层。 使用基于OFDM子载波的自适应调制技术减轻了通过金属通信链路的严重频率选择性衰落的影响，并通过利用信道的慢变性质来提高频谱效率。 为了解决峰均功率比（PAPR）的潜在不良影响，并且为了更有效地利用系统中的功率放大器，本发明在自适应OFDM中修改并实现了基于符号旋转和反演的PAPR降低算法 框架。 与传统的窄带技术相比，这种联合自适应物理层能够将数据速率提高大约220％，平均发射功率大约为7mW，同时被限制到期望的BER。

公开(公告)号：US20140161169A1

公开(公告)日：2014-06-12

申请号：US14119338

申请日：2012-05-25

Applicant: DREXEL UNIVERSITY

Inventor： Richard Primerano ,  Kevin Wanuga ,  Magdalena Bielinski ,  Kapil R. Dandekar ,  Moshe Kam ,  Guillermo A. Sosa

IPC: H04L27/26 ,  H04L27/01

CPC classification number: H04L27/262 ,  H04B11/00 ,  H04L1/0005 ,  H04L5/0007 ,  H04L5/0046 ,  H04L27/01 ,  H04L27/2614 ,  H04L27/362 ,  Y02D70/144 ,  Y02D70/48

Abstract: A link adaptive orthogonal frequency-division multiplexed (OFDM) ultrasonic physical layer is provided that is capable of high data rate communication through metallic structures. The use of an adaptive OFDM subcarrier-based modulation technique mitigates the effects of severe frequency selective fading of the through-metal communication link and improves spectral efficiency by exploiting the slow-varying nature of the channel. To address the potential ill effects of peak-to-average power ratio (PAPR) and to make more efficient use of the power amplifiers in the system, the invention modifies and implements a symbol rotation and inversion-based PAPR reduction algorithm in the adaptive OFDM framework. This joint adaptive physical layer is capable of increasing data rates by roughly 220% in comparison to conventional narrowband techniques at average transmit powers of roughly 7 mW while constrained to a desired BER.

Abstract translation: 提供了能够通过金属结构进行高数据速率通信的链路自适应正交频分复用（OFDM）超声波物理层。 使用基于OFDM子载波的自适应调制技术减轻了通过金属通信链路的严重频率选择性衰落的影响，并通过利用信道的慢变性质来提高频谱效率。 为了解决峰均功率比（PAPR）的潜在不良影响，并且为了更有效地利用系统中的功率放大器，本发明在自适应OFDM中修改并实现了基于符号旋转和反演的PAPR降低算法 框架。 与传统的窄带技术相比，这种联合自适应物理层能够将数据速率提高大约220％，平均发射功率大约为7mW，同时被限制到期望的BER。