公开(公告)号：US20150078429A1

公开(公告)日：2015-03-19

申请号：US14033818

申请日：2013-09-23

申请人： Broadcom Corporation

发明人： Hou-Shin Chen ,  Fu-Hsuan Chiu

IPC分类号： H04L25/03

CPC分类号： H04L25/03159

摘要： A communication device, such as a smart phone, includes logic to determine a noise power estimate. In an example, a frequency domain calculation may be used to determine noise components within the noise power estimate. Further, a product of a channel estimate and equalizer effect may be used in the determination of the levels noise components, such as, inter-symbol interference power and neighbor cell interference power.

摘要翻译： 诸如智能电话的通信设备包括确定噪声功率估计的逻辑。 在一个示例中，可以使用频域计算来确定噪声功率估计中的噪声分量。 此外，可以使用信道估计和均衡器效应的乘积来确定诸如符号间干扰功率和相邻小区干扰功率的电平噪声分量。

公开(公告)号：US20150063507A1

公开(公告)日：2015-03-05

申请号：US14474728

申请日：2014-09-02

申请人： COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENE ALT

发明人： Jean-Baptiste DORE ,  Nicolas CASSIAU

IPC分类号： H04L25/03

CPC分类号： H04L25/03159 ,  H04L27/2601 ,  H04L27/264 ,  H04L27/2657

摘要： The invention concerns a filter bank receiver (FBMC) effecting a carrier frequency offset compensation in the frequency domain. The receiver comprises an FFT module extended by the overlap factor (610), a module (630) offsetting a predetermined number of subcarriers at the output of the FFT followed by a filter for reducing interference between subcarriers (640), the number of subcarriers and the coefficients of the interference reduction filter being determined from an estimation () of the frequency offset. The vector of samples thus obtained is then the subject of channel equalisation (650) before being filtered by a battery of analysis filters and spectrally de-spread (660). Finally, after spectral de-spreading, the vector of samples is demodulated by an OQAM demodulation (670) so as to recover the transmitted data.

摘要翻译： 本发明涉及在频域中实现载波频率偏移补偿的滤波器组接收器（FBMC）。 接收机包括通过重叠因子（610）延伸的FFT模块，在FFT的输出处抵消预定数量的子载波的模块（630），随后是用于减少子载波（640）之间的干扰的滤波器，子载波的数量和 根据频率偏移的估计（）来确定干扰减少滤波器的系数。 这样获得的样本的矢量然后是通过电池的分析滤波器和光谱去扩散（660）滤波之前的信道均衡（650）的对象。 最后，在频谱解扩后，通过OQAM解调（670）解调采样矢量，以恢复发送的数据。

公开(公告)号：US08948321B2

公开(公告)日：2015-02-03

申请号：US14187436

申请日：2014-02-24

申请人： MagnaCom Ltd.

发明人： Amir Eliaz ,  Ilan Reuven

IPC分类号： H03D1/00 ,  H04L27/06 ,  H04L1/00 ,  H04L25/03 ,  H04L27/26 ,  H04L25/02

CPC分类号： H04L27/2628 ,  H04L1/0054 ,  H04L25/02 ,  H04L25/03038 ,  H04L25/03159 ,  H04L25/03197 ,  H04L25/03821 ,  H04L25/497 ,  H04L27/2647 ,  H04L27/3405 ,  H04L2025/03414 ,  H04L2025/0342 ,  H04L2025/03522

摘要： A receiver may be operable to receive an inter-symbol correlated (ISC) signal, and generate a plurality of soft decisions as to information carried in the ISC signal. The soft decisions may be generated using a reduced-state sequence estimation (RSSE) process. The RSSE process may be such that the number of symbol survivors retained after each iteration of the RSSE process is less than the maximum likelihood state space. The plurality of soft decisions may comprise a plurality of log likelihood ratios (LLRs). Each of the plurality of LLRs may correspond to a respective one of a plurality of subwords of a forward error correction (FEC) codeword.

摘要翻译： 接收机可以用于接收符号间相关（ISC）信号，并且生成关于在ISC信号中携带的信息的多个软判决。 可以使用缩减状态序列估计（RSSE）过程来产生软判决。 RSSE过程可以使得在RSSE过程的每次迭代之后保留的符号幸存者的数量小于最大似然状态空间。 多个软判决可以包括多个对数似然比（LLR）。 多个LLR中的每一个可以对应于前向纠错（FEC）码字的多个子词中的相应一个。

公开(公告)号：US20150010108A1

公开(公告)日：2015-01-08

申请号：US14329100

申请日：2014-07-11

申请人： MagnaCom Ltd.

发明人： Amir Eliaz ,  Ilan Reuven

IPC分类号： H04L27/26 ,  H04L5/00

CPC分类号： H04L27/2697 ,  H04L1/0042 ,  H04L1/0071 ,  H04L1/06 ,  H04L5/0044 ,  H04L5/006 ,  H04L5/0098 ,  H04L25/03159 ,  H04L27/2626 ,  H04L27/2628 ,  H04L27/2646 ,  H04L27/2647 ,  H04L27/265 ,  H04L27/2657 ,  H04L2027/003 ,  H04L2027/0053 ,  H04L2027/0067

摘要： A system may comprise a symbol mapper circuit that outputs C′ quadrature amplitude modulation (QAM) symbols per orthogonal frequency division multiplexing (OFDM) symbol. The system may also comprise circuitry operable to process said C′ QAM symbols using a circulant matrix to generate a particular OFDM symbol consisting of C+Δ subcarriers, where C′ is a first integer, C is a second integer less than C′, and Δ is an integer equal to the number of non-data-carrying subcarriers in the particular OFDM symbol. The circulant matrix may be a P×P matrix, where P is an integer less than C′. The system may comprise a nonlinear circuit that introduces nonlinear distortion to said particular OFDM symbol.

摘要翻译： 系统可以包括每个正交频分复用（OFDM）符号输出C'正交幅度调制（QAM）符号的符号映射器电路。 该系统还可以包括可操作以使用循环矩阵处理所述C'QAM符号以产生由C +和Dgr组成的特定OFDM符号的电路; 子载波，其中C'是第一整数，C是小于C'的第二整数，＆Dgr; 是等于特定OFDM符号中的非数据携带子载波数的整数。 循环矩阵可以是P×P矩阵，其中P是小于C'的整数。 该系统可以包括将非线性失真引入到所述特定OFDM符号的非线性电路。

公开(公告)号：US08908785B2

公开(公告)日：2014-12-09

申请号：US13961322

申请日：2013-08-07

申请人： Renesas Electronics Corporation

发明人： Kichung Kim ,  Hiroki Sugimoto

IPC分类号： H04K1/10 ,  H04L27/28 ,  H04B7/12 ,  H04B7/08

CPC分类号： H04L27/265 ,  H04B7/02 ,  H04B7/0857 ,  H04B7/12 ,  H04L25/03159 ,  H04L2025/03681

摘要： To improve a quality of a combined signal obtained by maximum ratio combining performed when a transmission signal of OFDM system is diversity-received with a small computation amount or a small circuit size. In a receiving apparatus, a combining unit corrects, when combining a sub-carrier signal of each branch obtained by performing Fourier transform on a reception signal of each branch at a maximum ratio for each sub-carrier, a weighting coefficient of each branch according to a magnitude relation of an intensity of the reception signal of each branch before Fourier transform. Specifically, the combining unit corrects the weighting coefficient of each branch so as to weaken an influence of a transmission path response estimated for a sub-carrier signal of the branch in branches with smaller reception signal intensities.

摘要翻译： 为了提高在OFDM系统的发送信号以小的计算量或小的电路尺寸进行分集接收时执行的最大比率组合所获得的组合信号的质量。 在接收装置中，组合单元在以每个子载波的最大比率对每个分支的接收信号进行傅里叶变换获得的每个分支的子载波信号进行组合时，校正每个分支的加权系数，根据 在傅立叶变换之前每个分支的接收信号的强度的大小关系。 具体地，组合单元校正每个分支的加权系数，以便削弱对具有较小接收信号强度的分支中的分支的副载波信号估计的传输路径响应的影响。

公开(公告)号：US20140349601A1

公开(公告)日：2014-11-27

申请号：US14453516

申请日：2014-08-06

申请人： Cohda Wireless Pty. Ltd.

发明人： Paul Dean Alexander ,  Alexander James Grant ,  David Victor Lawrie Haley

IPC分类号： H04B1/16 ,  H04B1/10

CPC分类号： H04L25/022 ,  H04B1/10 ,  H04B1/16 ,  H04L25/0224 ,  H04L25/03159 ,  H04L27/2647

摘要： Methods and apparatus are described for processing data in a wireless communication network. Iterative estimation techniques are used to enable tracking of time-varying communication channels. A signal is transmitted over a channel in the network, the signal comprising a sequence of symbols carried on a plurality of sub-carriers. Boot-up estimator estimates, in a time domain, parameters of a model of the channel based on the received signal. A domain converter transforms at least one of the estimated parameters from the time domain to provide at least one transformed parameter in a second domain. An equalizer and decoder determine estimates of symbols from the received signal using the at least one transformed parameter, and tracking estimator updates the estimated model parameters during reception of the signal using at least one estimated symbol.

摘要翻译： 描述了用于在无线通信网络中处理数据的方法和装置。 使用迭代估计技术来跟踪时变通信信道。 信号通过网络中的信道发送，该信号包括在多个子载波上承载的码元序列。 引导估计器在时域中估计基于接收信号的信道模型的参数。 域转换器从时域转换估计参数中的至少一个，以在第二域中提供至少一个变换参数。 均衡器和解码器使用至少一个变换参数确定来自接收信号的符号的估计，并且跟踪估计器使用至少一个估计符号在接收信号期间更新估计的模型参数。

公开(公告)号：US08879653B2

公开(公告)日：2014-11-04

申请号：US13384932

申请日：2010-08-06

申请人： Yunxin Li

发明人： Yunxin Li

IPC分类号： H04L27/22 ,  H04L27/38 ,  H04L27/34 ,  H04L25/06 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

CPC分类号： H04L25/067 ,  H04L25/0228 ,  H04L25/03159 ,  H04L27/2655 ,  H04L27/3433

摘要： This invention concerns soft-decision demapping of Quadrature Amplitude Modulation (QAM) signals to enable soft-decision channel decoding in a communications system. In a first aspect the invention is a method for performing the soft-decision demapping of Quadrature Amplitude Modulation (QAM) signals to enable soft-decision channel decoding in a communications system. The method comprises the steps of Extracting baseband signals from both I-and-Q channels. Sampling the baseband signals to extract a stream of complex numbers. Converting the stream of complex numbers to frequency domain vectors with components for each subcarrier frequency. Approximating bit log-likelihood ratios for each symbol directly from the real and imaginary parts of the corresponding frequency vector, without equalization by the estimated channel. And, soft-decoding of the channel codes using the approximated log-likelihood ratios. In other aspects the invention concerns a device for performing the method and software for performing the method.

摘要翻译： 本发明涉及正交幅度调制（QAM）信号的软判决解映射，以便在通信系统中实现软判决信道解码。 在第一方面，本发明是一种用于执行正交幅度调制（QAM）信号的软判决去映射以在通信系统中实现软判决信道解码的方法。 该方法包括从I和Q信道中提取基带信号的步骤。 对基带信号进行采样以提取复数流。 将复数流转换为具有每个子载波频率的分量的频域向量。 每个符号的近似比特对数似然比直接来自相应频率矢量的实部和虚部，而不用估计的信道进行均衡。 并且，使用近似对数似然比对信道码进行软解码。 在其他方面，本发明涉及一种用于执行用于执行该方法的方法和软件的装置。

公开(公告)号：US08855185B2

公开(公告)日：2014-10-07

申请号：US14111979

申请日：2011-11-18

申请人： Naosuke Ito ,  Jun Ido

发明人： Naosuke Ito ,  Jun Ido

IPC分类号： H03H7/30 ,  H04B1/10 ,  H04L27/01 ,  H04L25/03 ,  H04L25/02

CPC分类号： H04L27/01 ,  H04L25/0212 ,  H04L25/03159

摘要： This equalization device and method, while preventing an expansion of circuit size, enable high-speed detection of a CIR in order to effectively achieve frequency domain equalization even when the phase of the received signal is significantly different from the phase of the known signal, and when the transmission channel has large temporal variations. A reference signal extraction unit (112) extracts both a real part component and an imaginary part component from the portion of the received signal including the known signal. A CIR detection filter unit (120) filters the known signal to generate a first processed signal and a second processed signal, detects real part filter coefficients by updating a first filter coefficient used in filtering the known signal in such a way that the first processed signal converges to the real part component, and detects imaginary part filter coefficients by filtering the known signal in such a way that the second processed signal converges to the imaginary part component. A CIR output unit (140) uses either the real part filter coefficients or the imaginary part filter coefficients to identify the channel impulse response.

摘要翻译： 这种均衡装置和方法在防止电路尺寸扩大的同时，能够高速检测CIR，以便即使接收信号的相位与已知信号的相位明显不同，也能有效地实现频域均衡，以及 当传输信道具有大的时间变化时。 参考信号提取单元（112）从包括已知信号的接收信号的部分中提取实部分量和虚部分量两者。 CIR检测滤波器单元（120）对已知信号进行滤波以产生第一处理信号和第二处理信号，通过更新用于滤波已知信号的第一滤波器系数来检测实部滤波器系数，使得第一处理信号 收敛到实部分量，并且通过以使得第二处理信号收敛到虚部分量的方式对已知信号进行滤波来检测虚部滤波器系数。 CIR输出单元（140）使用实部滤波器系数或虚部滤波器系数来识别信道脉冲响应。

公开(公告)号：US08837616B2

公开(公告)日：2014-09-16

申请号：US13562724

申请日：2012-07-31

申请人： Terrance W. Charbonneau ,  John P. Johnston ,  Bruce E. Reidenbach ,  Gregory T. Barnett

发明人： Terrance W. Charbonneau ,  John P. Johnston ,  Bruce E. Reidenbach ,  Gregory T. Barnett

IPC分类号： H04K1/10

CPC分类号： H04L25/03159 ,  H04L25/0228 ,  H04L25/0258 ,  H04L27/2647 ,  H04L2025/03414

摘要： A technique for equalizing a distributed pilot OFDM signal with decision feedback involves correlating a received OFDM signal against a pilot reference to obtain a coarse channel estimate, where the received OFDM signal includes a distributed pilot signal and an OFDM data signal. The received OFDM signal is equalized based on the coarse channel estimate and the distributed pilot signal is removed to generate a coarse data signal estimate. The coarse data signal estimate is removed from the received OFDM signal using the coarse channel estimate to generate a residual pilot signal. The residual pilot signal can then be correlated against the pilot reference to obtain a fine channel estimate. The received OFDM signal is equalized based on the fine channel estimate, and the distributed pilot signal is removed to produce a fine data signal estimate from which data is recoverable.

摘要翻译： 用于通过判决反馈来均衡分布式导频OFDM信号的技术涉及将接收到的OFDM信号与导频参考相关，以获得粗信道估计，其中所接收的OFDM信号包括分布导频信号和OFDM数据信号。 接收到的OFDM信号基于粗略信道估计被均衡，并且去除分布导频信号以产生粗略的数据信号估计。 使用粗略信道估计从接收的OFDM信号中去除粗略数据信号估计，以产生残余导频信号。 然后可以将残余导频信号与导频参考相关以获得精细信道估计。 接收到的OFDM信号基于精细信道估计被均衡，并且去除分布导频信号以产生数据可恢复的精细数据信号估计。

公开(公告)号：US08831081B2

公开(公告)日：2014-09-09

申请号：US13393066

申请日：2011-08-18

申请人： Junichi Abe ,  Hidemi Noguchi

发明人： Junichi Abe ,  Hidemi Noguchi

IPC分类号： H03H7/30 ,  H04B10/61 ,  H04B3/14 ,  H03H17/02 ,  H04L25/03

CPC分类号： H04B10/616 ,  H03H17/0202 ,  H03H2218/04 ,  H04B3/142 ,  H04L25/03038 ,  H04L25/03057 ,  H04L25/03159 ,  H04L25/03178 ,  H04L2025/03401 ,  H04L2025/03636

摘要： In order to solve a problem of achieving distortion compensation with high accuracy, a digital filter device includes a first distortion compensation filter unit for conducting distortion compensation of first waveform distortion included in an inputted signal through digital signal processing, a first filter coefficient setting unit for setting a filter coefficient of the first distortion compensation filter unit, a second distortion compensation filter unit for compensating second waveform distortion included in a signal outputted from the first distortion compensation filter unit, and a second filter coefficient setting unit for setting a filter coefficient of the second distortion compensation filter unit based on the filter coefficient set by the first filter coefficient setting unit.

摘要翻译： 为了以高精度解决失真补偿的问题，数字滤波器装置包括：第一失真补偿滤波器单元，用于通过数字信号处理对包含在输入信号中的第一波形失真进行失真补偿;第一滤波器系数设定单元， 设置第一失真补偿滤波器单元的滤波器系数;第二失真补偿滤波器单元，用于补偿从第一失真补偿滤波器单元输出的信号中包括的第二波形失真;以及第二滤波器系数设置单元，用于设置滤波器系数 第二失真补偿滤波器单元，其基于由第一滤波器系数设置单元设置的滤波器系数。