公开(公告)号：US08009764B2

公开(公告)日：2011-08-30

申请号：US12093131

申请日：2006-11-09

Applicant: Yeong Hyeon Kwon ,  Seung Hee Han ,  Min Seok Noh ,  Young Woo Yun

Inventor： Yeong Hyeon Kwon ,  Seung Hee Han ,  Min Seok Noh ,  Young Woo Yun

IPC: H04L25/49

CPC classification number: H04L27/2621 ,  H04B2201/70706

Abstract: A method and apparatus for diminishing a peak power to average power ratio (PAPR) in an OFDM/OFDMA communication system are disclosed, by which complexity in an OFDM/OFDMA communication system can be reduced. In an OFDM or OFDMA communication system, the present invention includes a circular shift module circularly shifting to output at least one or more data sequences according to circular shift information to be applied to each of the at least one or more data sequences converted to a time domain from a frequency domain, a combining module combining the at least one or more data sequences outputted from the circular shift module, and a PAPR calculating module calculating the PAPR of an entire data sequence combined by the combining module.

Abstract translation: 公开了一种用于减小OFDM / OFDMA通信系统中的峰值功率与平均功率比（PAPR）的方法和装置，由此可以减少OFDM / OFDMA通信系统的复杂性。 在OFDM或OFDMA通信系统中，本发明包括循环移位模块，循环移位以根据循环移位信息输出至少一个或多个数据序列，以应用于转换为时间的至少一个或多个数据序列中的每一个 域，组合从循环移位模块输出的至少一个或多个数据序列的组合模块和计算组合模块组合的整个数据序列的PAPR的PAPR计算模块。

公开(公告)号：US20110064155A1

公开(公告)日：2011-03-17

申请号：US12991393

申请日：2009-05-22

Applicant: Junya Ashita

Inventor： Junya Ashita

IPC: H04L27/28

CPC classification number: H04L27/368 ,  H03F1/3247 ,  H03F1/3294 ,  H03F3/24 ,  H03F2200/204 ,  H03F2200/207 ,  H03F2200/336 ,  H04B2201/70706

Abstract: A distortion compensation circuit and a distortion compensation method in which signal level of a signal after distortion compensation is limited, and which can improve the distortion compensation effect are provided. A distortion compensation circuit of the present invention includes an input level limitation means which limits signal level of an input signal from outside to no more than the first limit value, and outputs a signal before distortion compensation; a distortion compensation means which, based on a distortion compensation coefficient, performs distortion compensation processing to the signal before distortion compensation and outputs a signal after distortion compensation; a distortion compensation coefficient calculation means which, based on a difference between part of output signals of an amplifier which amplified the signal after distortion compensation and the signal before distortion compensation, calculate a coefficient for compensating distortion of the output signal of the amplifier as the distortion compensation coefficient; a storage means which stores the distortion compensation coefficient by correlating it to signal level of the signal before distortion compensation, and a limit value calculation means which calculates signal level of the signal before distortion compensation when signal level, when distortion compensation processing is performed based on the distortion compensation coefficient stored in the storage means, is no more than the second limit value which is a limit value of signal level of the input signal to the amplifier, as the first limit value.

Abstract translation: 一种失真补偿电路和失真补偿方法，其中失真补偿后的信号的信号电平受到限制，并且可以提高失真补偿效果。 本发明的失真补偿电路包括将输入信号从外部的信号电平限制为不大于第一限制值的输入电平限制装置，并输出失真补偿前的信号; 失真补偿装置，其基于失真补偿系数，对失真补偿前的信号进行失真补偿处理，并输出失真补偿后的信号; 失真补偿系数计算装置，基于放大了失真补偿后的信号的放大器的输出信号的一部分与失真补偿前的信号之间的差异，计算用于补偿放大器的输出信号的失真的系数作为失真 补偿系数; 存储装置，其通过将失真补偿系数与失真补偿前的信号的信号电平相关联来存储失真补偿系数;以及限制值计算装置，当进行失真补偿处理时，当执行失真补偿处理时，计算失真补偿前的信号的信号电平 存储在存储装置中的失真补偿系数不大于作为第一限制值的作为到放大器的输入信号的信号电平的限制值的第二限制值。

公开(公告)号：US07894504B2

公开(公告)日：2011-02-22

申请号：US11880564

申请日：2007-07-23

Applicant: Goran Djuknic

Inventor： Goran Djuknic

IPC: H04B1/00

CPC classification number: H04B1/713 ,  H04B1/692 ,  H04B2201/70706

Abstract: A hybrid spread spectrum system includes a signal combiner for (a) receiving a plurality of spread spectrum encoded data signals and (b) forming a plurality of combined signals. A first set of mixers is included for (a) receiving the plurality of combined signals and at least two carriers, and (b) forming at least a two-carrier, constant envelope signal. A second set of mixers is also included for (a) receiving the at least two-carrier, constant envelope signal and a transmitter hopping signal and (b) forming a hybrid spread spectrum signal. The combined signals include (a) [s1(t)−s1(t)s2(t)s3(t)] and (b) [s2(t)+s3(t)], where si(t) are three separate spread spectrum encoded data signals. The transmitter hopping signal is a sequence of tones having (a) a duration Tc, where Tc is a chip duration, and (b) frequencies fn taken from a set of 2k values, where k is a number of bits from a pseudo-random noise (PRN) sequence.

Abstract translation: 混合扩频系统包括信号组合器，用于（a）接收多个扩频编码数据信号，（b）形成多个组合信号。 包括第一组混频器，用于（a）接收多个组合信号和至少两个载波，以及（b）形成至少一个双载波恒定包络信号。 还包括第二组混频器，用于（a）接收至少两载波恒定包络信号和发射机跳变信号，以及（b）形成混合扩频信号。 组合信号包括（a）[s1（t）-s1（t）s2（t）s3（t）]和（b）[s2（t）+ s3（t）]，其中si（t） 扩频编码数据信号。 发射机跳变信号是具有（a）持续时间Tc的音调序列，其中Tc是码片持续时间，以及（b）从一组2k值得到的频率fn，其中k是来自伪随机的比特数 噪声（PRN）序列。

公开(公告)号：US20110019719A1

公开(公告)日：2011-01-27

申请号：US12507111

申请日：2009-07-22

Applicant: Alan J. Michaels ,  Chester B. David

Inventor： Alan J. Michaels ,  Chester B. David

IPC: H04B1/707

CPC classification number: H04B1/707 ,  H04B2201/70706 ,  H04J13/0018

Abstract: Systems (100) and methods (700) for providing a communications link with a power-limited communication transmitter (102) positioned remotely from an intended receiver system (104). The methods involve channel encoding a carrier signal with data provided at the power-limited communication transmitter to form an information signal. The methods also involve generating a chaotic spreading sequence based on a chaotic number sequence. The chaotic spreading sequence has a magnitude that is constant and a variable arbitrary phase angle comprising phase values which are uniformly distributed over a predetermined range of angles. A spread spectrum signal is formed by multiplying the information signal by the chaotic spreading sequence. The spread spectrum signal has an adjustable amplitude characteristic and a zero autocorrelation. The spread spectrum signal is transmitted from the power-limited communication transmitter to the intended receiver system.

Abstract translation: 用于与远离预期接收机系统（104）定位的功率受限通信发射机（102）提供通信链路的系统（100）和方法（700）。 所述方法涉及通过在功率受限通信发射机处提供的数据对载波信号进行信道编码以形成信息信号。 该方法还涉及基于混沌序列序列产生混沌扩展序列。 混沌扩展序列具有恒定的幅度和包括在预定角度范围内均匀分布的相位值的可变任意相位角。 通过将信息信号乘以混沌扩展序列形成扩频信号。 扩频信号具有可调幅度特性和零自相关。 扩频信号从功率受限的通信发射机发射到预期的接收机系统。

公开(公告)号：US07873116B2

公开(公告)日：2011-01-18

申请号：US11797025

申请日：2007-04-30

Applicant: Takashi Okada ,  Tatsuya Abe

Inventor： Takashi Okada ,  Tatsuya Abe

IPC: H04L27/00 ,  H04L25/03 ,  H04L27/28

CPC classification number: H04L5/06 ,  H04B1/0475 ,  H04B2201/70706 ,  H04L27/2624

Abstract: A transmitter is provided which effectively reduces a peak that occurs in transmitting signal electric power. A baseband limiter applies a peak reduction process to digital signals on a plurality of carriers in a baseband. A band limiting filter applies a band limitation process to the digital signal on each of the carriers to which the peak reduction process is applied. Quadrature modulation processing is applied to the digital signal on each of the carriers to which the band limitation process is applied. The digital signals on the carriers to which the quadrature modulation process is applied are added. An intermediate frequency limiter multiplies a signal of the added result by a window function that is weighted depending on the magnitude of the detected peak, and applies a peak reduction process thereto.

Abstract translation: 提供了一种有效地减少发送信号电力中发生的峰值的发射机。 基带限制器对基带中的多个载波上的数字信号应用峰值降低处理。 频带限制滤波器对应用峰值降低处理的每个载波上的数字信号应用频带限制处理。 对应用带限制处理的每个载波上的数字信号应用正交调制处理。 加上正交调制处理所应用的载波上的数字信号。 中间频率限制器将相加结果的信号乘以根据检测到的峰值的幅度加权的窗口函数，并对其进行峰值降低处理。

公开(公告)号：US07872962B1

公开(公告)日：2011-01-18

申请号：US11447762

申请日：2006-06-05

Applicant: Rohit Nabar ,  Kedar Shirali ,  Hui-Ling Lou ,  Jungwon Lee

Inventor： Rohit Nabar ,  Kedar Shirali ,  Hui-Ling Lou ,  Jungwon Lee

IPC: H04J11/00

CPC classification number: H04B7/084 ,  H04B7/0615 ,  H04B7/0845 ,  H04B2201/70706 ,  H04L25/0232 ,  H04L27/0014

Abstract: The disclosed technology relates to a communication system and method in which multiple versions of a signal are processed to detect the signal. The communication system can include transmitters that communicate different versions of a signal to a receiver. The different versions are weighted versions of the signal and are communicated on different channels. The weight for a weighted signal is based on an inverse of an estimate of the phase shift of the particular channel to which the weighted signal will be communicated. The weights are also based on a unity gain such that each weighted signal has the same magnitude as the original signal. A receiver that receives the weighted signals processes the received signals to detect the original signal.

Abstract translation: 所公开的技术涉及其中处理多个版本的信号以检测信号的通信系统和方法。 通信系统可以包括将信号的不同版本传送到接收机的发射机。 不同的版本是信号的加权版本，并且在不同的信道上进行通信。 加权信号的权重基于加权信号将被传送到的特定信道的相移的估计的倒数。 权重也基于单位增益，使得每个加权信号具有与原始信号相同的幅度。 接收加权信号的接收机处理接收的信号以检测原始信号。

公开(公告)号：US20110002364A1

公开(公告)日：2011-01-06

申请号：US12496214

申请日：2009-07-01

Applicant: Alan J. Michaels ,  David B. Chester

Inventor： Alan J. Michaels ,  David B. Chester

IPC: H04B1/707

CPC classification number: H04J13/0018 ,  H04B1/707 ,  H04B1/7075 ,  H04B2001/70706 ,  H04B2201/70706 ,  H04J13/10 ,  H04K3/25

Abstract: A spread spectrum communication system includes a channel encoder configured for modulating a carrier signal with data to form an information signal. A spreading sequence generator is configured for generating a spreading sequence having a phase angle dependent upon a chaotic sequence and contiguously distributed over a predetermined range. The chaotic sequence also has a magnitude which is selectively dependent upon the pseudo-random number or chaotic sequence. The invention also includes a multiplier configured for forming a spread spectrum signal by multiplying the information signal by the spreading sequence. The spreading sequence generator is responsive to a magnitude control signal for controlling the selective dependency of said magnitude. The magnitude can be constant to form a constant amplitude zero autocorrelation signal. Alternatively, the magnitude can be allowed to vary in selectively controlled chaotic or pseudo-random manner to vary a peak to average power ratio.

Abstract translation: 扩频通信系统包括：通道编码器，被配置为用数据调制载波信号以形成信息信号。 扩展序列生成器被配置用于生成具有取决于混沌序列并在预定范围上连续分布的相位角的扩展序列。 混沌序列也具有选择性地依赖于伪随机数或混沌序列的量级。 本发明还包括被配置用于通过将信息信号乘以扩展序列来形成扩频信号的乘法器。 扩展序列发生器响应幅度控制信号来控制所述幅度的选择性依赖性。 该幅度可以恒定以形成恒定幅度零自相关信号。 或者，可以允许以选择性控制的混沌或伪随机方式改变幅度以改变峰值与平均功率比。

公开(公告)号：US20100040089A1

公开(公告)日：2010-02-18

申请号：US12605264

申请日：2009-10-23

Applicant: LEONARD JOSEPH CIMINI, JR. ,  Nelson Ray Sollenberger

Inventor： LEONARD JOSEPH CIMINI, JR. ,  Nelson Ray Sollenberger

IPC: H04L27/00 ,  H04B7/00 ,  H04L27/28 ,  H04J13/00 ,  H01Q11/12

CPC classification number: H04L27/2623 ,  H04B1/0475 ,  H04B7/2628 ,  H04B2201/70706 ,  H04L27/2614 ,  H04L27/2621

Abstract: The present invention provides a method and system for reducing the peak to average power ratio (PAP) of a signal with low computational complexity. According to one embodiment, the present invention is applied to reduce the PAP of an OFDM signal. According to an alternative embodiment, the present invention, is applied to reduce the PAP of a CDMA signal. Rather than seeking the optimum solution, which involves significant computational complexity, the present invention provides for a number of sub-optimal techniques for reducing the PAP of an OFDM signal but with much lower computational complexity. In particular, according to one embodiment utilizing the PTS approach, an iterative technique is used to assign phase factors to each of a set of partial transmit sequences from a set of possible phase factors. Experimental results using the iterative technique showed only a slight degradation (1 dB) from the optimal approach using the same number of subblocks and subcarriers. In an alternative embodiment, which avoids feedback required by the iterative approach, a sequence of phase factors are generated randomly and assigned to each of a set of partial transmit sequences. This procedure is repeated for a pre-determined number of trials and the random sequence generating the lowest PAP is selected. In a third embodiment, a set of phase factors is generated using a structured sequence such as a Walsh sequence.

Abstract translation: 本发明提供一种降低计算复杂度低的信号的峰均功率比（PAP）的方法和系统。 根据一个实施例，本发明应用于减少OFDM信号的PAP。 根据替代实施例，本发明被应用于减少CDMA信号的PAP。 本发明不是寻求涉及大量计算复杂度的最佳解决方案，而是提供了许多用于减少OFDM信号的PAP但具有低得多的计算复杂度的次优技术。 特别地，根据利用PTS方法的一个实施例，使用迭代技术来从一组可能的相位因子将相位因子分配给一组部分发送序列中的每一个。 使用迭代技术的实验结果显示，使用相同数量的子块和子载波的最优方法仅显示轻微的退化（1 dB）。 在避免迭代方法所需的反馈的替代实施例中，随机产生一系列相位因子并分配给一组部分发送序列中的每一个。 对于预定数量的试验重复该过程，并且选择产生最低PAP的随机序列。 在第三实施例中，使用诸如沃尔什序列的结构化序列来生成一组相位因子。

公开(公告)号：US07646703B2

公开(公告)日：2010-01-12

申请号：US11188771

申请日：2005-07-26

Applicant: Jason Alexander Trachewsky ,  Rajendra T. Moorti

Inventor： Jason Alexander Trachewsky ,  Rajendra T. Moorti

IPC: H04J11/00

CPC classification number: H04L27/2613 ,  H04B2201/70701 ,  H04B2201/70706 ,  H04L5/0048 ,  H04L25/0226 ,  H04L27/262

Abstract: A network device for generating an expanded long training sequence with a minimal peak-to-average ratio. The network device includes a signal generating circuit for generating the expanded long training sequence. The network device also includes an Inverse Fourier Transform for processing the expanded long training sequence from the signal generating circuit and producing an optimal expanded long training sequence with a minimal peak-to-average ratio. The expanded long training sequence and the optimal expanded long training sequence are stored on more than 52 sub-carriers.

Abstract translation: 一种用于产生具有最小峰均比的扩展长训练序列的网络设备。 网络设备包括用于生成扩展的长训练序列的信号发生电路。 网络设备还包括用于从信号发生电路处理扩展的长训练序列的逆傅里叶变换，并产生具有最小峰均比的最佳扩展长训练序列。 扩展的长训练序列和最佳扩展长训练序列存储在52个子载波上。

公开(公告)号：US20100002751A1

公开(公告)日：2010-01-07

申请号：US12166910

申请日：2008-07-02

Applicant: PAUL DENT

Inventor： PAUL DENT

IPC: H04B1/707 ,  H04L27/00 ,  H04L27/06

CPC classification number: H04L27/3411 ,  H04B2201/70706 ,  H04L27/3416

Abstract: A transmitter and a method are described herein that can generate a radio signal with a reduced ratio of peak amplitude to root-mean-square amplitude which helps to improve the transmit efficiency of the transmitter's power amplifier. In addition, a receiver is also described herein that can decode the radio signal.

Abstract translation: 这里描述的发射器和方法可以产生具有降低的峰值幅度与均方根幅度的比率的无线电信号，这有助于提高发射机的功率放大器的发射效率。 此外，本文还描述了可以对无线电信号进行解码的接收机。