公开(公告)号：US20110064175A1

公开(公告)日：2011-03-17

申请号：US12993394

申请日：2008-05-19

Applicant: Scott Leyonhjelm ,  Melvyn Pereira ,  Aaron Reid

Inventor： Scott Leyonhjelm ,  Melvyn Pereira ,  Aaron Reid

IPC: H04B1/10

CPC classification number: H04L27/2659 ,  H04L5/0023 ,  H04L25/0202 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695

Abstract: The present invention relates to methods and an apparatus for estimating a residual frequency error. According to an embodiment, an expected vector for selected subcarriers of a received symbol is estimated using a channel estimate vector and a reference vector; a sampling frequency mismatch is removed and a dot product is calculated using the expected and a received vector. An angle of the product is estimated and a change in angle from a previous symbol is calculated. The residual frequency is estimated using the calculated change in angle. In another embodiment, an expected subcarrier is estimated based on a channel estimate and on a reference subcarrier, an angle and magnitude of the multiplication between the expected and a received subcarrier are estimated; a phase offset is removed; a weighted mean value of the angles is calculated and the residual frequency error is estimated using a change in weighted mean angle.

Abstract translation: 本发明涉及用于估计残余频率误差的方法和装置。 根据实施例，使用信道估计向量和参考向量来估计接收符号的所选子载波的期望向量; 取样频率失配，使用预期和接收矢量计算点积。 估计产品的角度并计算与先前符号的角度的变化。 使用计算的角度变化来估计残差频率。 在另一个实施例中，基于信道估计和在参考子载波上估计预期副载波，估计预期和接收副载波之间的乘法的角度和幅度; 移除相位偏移; 计算角度的加权平均值，并使用加权平均角度的变化来估计残差频率误差。

公开(公告)号：US08559481B2

公开(公告)日：2013-10-15

申请号：US12451935

申请日：2007-06-25

Applicant: Vitaliy Sapozhnykov ,  Magnus Nilsbo ,  Scott Leyonhjelm

Inventor： Vitaliy Sapozhnykov ,  Magnus Nilsbo ,  Scott Leyonhjelm

IPC: H04B1/00

CPC classification number: H04L27/2675 ,  H04L7/042 ,  H04L27/2655 ,  H04L27/2656

Abstract: The present application relates to a method and an apparatus for synchronizing a receiver timing to a transmitter timing using a known preamble of a signal. In at least one embodiment of the method and/or the apparatus of the present application, a power normalized cross-correlation metric (PNCC metric) is estimated based on a signal power and a noise floor power. According to a first embodiment, two cross-correlation functions, one based on the PNCC metric and the other based on a cross-correlation metric, are used to decide if synchronization events occur and based on the analysis of time indexes and PNCC magnitude values, a timing synchronization index used to synchronize receiver timing to transmitter timing is determined. According to a second embodiment, the cross-correlation function based on the PNCC metric is used to decide if synchronization events occur and based on an analysis of time indexes and PNCC magnitude values using a clustering approach, a timing synchronization index is determined.

Abstract translation: 本申请涉及使用信号的已知前同步码使接收机定时与发射机定时同步的方法和装置。 在本申请的方法和/或装置的至少一个实施例中，基于信号功率和噪声底层功率来估计功率归一化互相关度量（PNCC度量）。 根据第一实施例，使用两个互相关函数，一个基于PNCC度量的互相关函数，另一个基于互相关度量，用于决定同步事件是否发生，并且基于时间索引和PNCC幅度值的分析， 确定用于将接收机定时与发射机定时同步的定时同步索引。 根据第二实施例，使用基于PNCC度量的互相关函数来确定同步事件是否发生，并且基于使用聚类方法的时间索引和PNCC幅度值的分析，确定定时同步索引。

公开(公告)号：US20100135447A1

公开(公告)日：2010-06-03

申请号：US12451935

申请日：2007-06-25

Applicant: Vitaliy Sapozhnykov ,  Magnus Nilsbo ,  Scott Leyonhjelm

Inventor： Vitaliy Sapozhnykov ,  Magnus Nilsbo ,  Scott Leyonhjelm

IPC: H04L7/04

CPC classification number: H04L27/2675 ,  H04L7/042 ,  H04L27/2655 ,  H04L27/2656

Abstract: The present application relates to a method and an apparatus for synchronising a receiver timing to a transmitter timing using a known preamble of a signal. In at least one embodiment of the method and/or the apparatus of the present application, a power normalised cross-correlation metric (PNCC metric) is estimated based on a signal power and a noise floor power. According to a first embodiment, two cross-correlation functions, one based on the PNCC metric and the other based on a cross-correlation metric, are used to decide if synchronisation events occur and based on the analysis of time indexes and PNCC magnitude values, a timing synchronisation index used to synchronise receiver timing to transmitter timing is determined. According to a second embodiment, the cross-correlation function based on the PNCC metric is used to decide if synchronisation events occur and based on an analysis of time indexes and PNCC magnitude values using a clustering approach, a timing synchronisation index is determined.

Abstract translation: 本申请涉及使用信号的已知前同步码使接收机定时与发射机定时同步的方法和装置。 在本申请的方法和/或装置的至少一个实施例中，基于信号功率和噪声底层功率来估计功率归一化互相关度量（PNCC度量）。 根据第一实施例，使用两个互相关函数，一个基于PNCC度量的互相关函数，另一个基于互相关度量，用于决定同步事件是否发生，并且基于时间索引和PNCC幅度值的分析， 确定用于将接收机定时与发射机定时同步的定时同步索引。 根据第二实施例，使用基于PNCC度量的互相关函数来确定同步事件是否发生，并且基于使用聚类方法的时间索引和PNCC幅度值的分析，确定定时同步索引。

公开(公告)号：US20100085865A1

公开(公告)日：2010-04-08

申请号：US12450836

申请日：2007-04-26

Applicant: Magnus Nilsbo ,  Tharaka Lamahewa ,  Scott Leyonhjelm

Inventor： Magnus Nilsbo ,  Tharaka Lamahewa ,  Scott Leyonhjelm

IPC: H04J11/00 ,  H04L12/26 ,  H04B1/707

CPC classification number: H04L25/022 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0222 ,  H04L25/0228 ,  H04L27/2647

Abstract: Low complex algorithms for estimating a delay spread or a RMS delay spread of a multipath channel using channel estimates are disclosed, leading to low overall power consumption. According to an embodiment of the present invention, a delay spread or a RMS delay spread of the multipath channel is determined based on a metric calculated as a function of channel estimates. In another embodiment, an average signal to noise ratio is taken into consideration in addition to the metric to estimate the delay spread or the RMS delay spread. In a further embodiment, the delay spread or the RMS delay spread of the multipath channel is estimated based on an average signal to noise ratio and on a metric being a function of the slope between subcarrier channel estimates. The present invention further relates to an apparatus for estimating a delay spread or a RMS delay spread of the multipath channel.

Abstract translation: 公开了用于使用信道估计来估计多径信道的延迟扩展或RMS延迟扩展的低复杂算法，导致低的总功耗。 根据本发明的实施例，基于作为信道估计的函数计算的度量来确定多路径信道的延迟扩展或RMS延迟扩展。 在另一个实施例中，除了用于估计延迟扩展或RMS延迟扩展的度量之外，考虑平均信噪比。 在另一个实施例中，基于平均信噪比和在子载波信道估计之间的斜率的函数的度量来估计多径信道的延迟扩展或RMS延迟扩展。 本发明还涉及用于估计多路径信道的延迟扩展或RMS延迟扩展的装置。

公开(公告)号：US06973135B1

公开(公告)日：2005-12-06

申请号：US09610612

申请日：2000-07-05

Applicant: Scott Leyonhjelm ,  Richard Hellberg ,  Joakim Eriksson

Inventor： Scott Leyonhjelm ,  Richard Hellberg ,  Joakim Eriksson

IPC: H03H17/00 ,  H03H17/02 ,  H04B7/08 ,  H04B7/26 ,  H04J99/00 ,  H04L23/02 ,  H04B7/216

CPC classification number: H03H17/0213 ,  H03H17/0266

Abstract: In a wireless telecommunications system, data processing delays associated with digital channelization and de-channelization may be reduced through the use of a technique that involves processing data blocks in conjunction with the transformation of the data blocks by a large, Fast Fourier Transform (FFT) algorithm, and makes use of multiple transmission and reception branches. In accordance with this technique, the processing delays associated with the FFT algorithm are minimized, but not to the detriment of other important channelizer/de-channelizer design characteristics, such as power consumption, die area and computational complexity.

Abstract translation: 在无线电信系统中，与数字信道化和去信道化相关联的数据处理延迟可以通过使用涉及通过大的快速傅里叶变换（FFT）的数据块的转换来处理数据块的技术来减少， 算法，并利用多个发送和接收分支。 根据该技术，与FFT算法相关联的处理延迟最小化，但不会损害其他重要的信道化/去信道化器设计特性，例如功耗，管芯面积和计算复杂度。

公开(公告)号：US06266687B1

公开(公告)日：2001-07-24

申请号：US09156630

申请日：1998-09-18

Applicant: Scott Leyonhjelm ,  Richard Hellberg

Inventor： Scott Leyonhjelm ,  Richard Hellberg

IPC: G06F1715

CPC classification number: H04L5/06

Abstract: The present invention increases the flexibility of the modified fast convolution algorithm. In a first exemplary embodiment of the present invention, a block compensator is inserted into the channelizer/de-channelizer processing chain for multiplying data in the processing chain with compensation constants. The block compensator corrects the phase continuity problem associated with the modified fast convolution algorithm to thereby allow unrestricted filter placement. In a second exemplary embodiment, the phase continuity problem is corrected by combining a frequency translation in the frequency domain with a compensatory frequency translation in the time domain. Both techniques increase the flexibility of the modified fast convolution algorithm whilst only marginally increasing computational requirements.

Abstract translation: 本发明增加了改进的快速卷积算法的灵活性。 在本发明的第一示例性实施例中，块补偿器被插入到通道化器/去通道化器处理链中，用于将处理链中的数据与补偿常数相乘。 块补偿器校正与修改的快速卷积算法相关联的相位连续性问题，从而允许无限制的滤波器放置。 在第二示例性实施例中，通过将频域中的频率转换与时域中的补偿频率变换组合来校正相位连续性问题。 这两种技术增加了修改后的快速卷积算法的灵活性，同时仅略微提高了计算量。

公开(公告)号：US07957481B2

公开(公告)日：2011-06-07

申请号：US12450836

申请日：2007-04-26

Applicant: Magnus Nilsbo ,  Tharaka Lamahewa ,  Scott Leyonhjelm

Inventor： Magnus Nilsbo ,  Tharaka Lamahewa ,  Scott Leyonhjelm

IPC: H04L27/28 ,  H04L27/06

CPC classification number: H04L25/022 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0222 ,  H04L25/0228 ,  H04L27/2647

Abstract: Low complex algorithms for estimating a delay spread or a RMS delay spread of a multipath channel using channel estimates are disclosed, leading to low overall power consumption. According to an embodiment of the present invention, a delay spread or a RMS delay spread of the multipath channel is determined based on a metric calculated as a function of channel estimates. In another embodiment, an average signal to noise ratio is taken into consideration in addition to the metric to estimate the delay spread or the RMS delay spread. In a further embodiment, the delay spread or the RMS delay spread of the multipath channel is estimated based on an average signal to noise ratio and on a metric being a function of the slope between subcarrier channel estimates. The present invention further relates to an apparatus for estimating a delay spread or a RMS delay spread of the multipath channel.

Abstract translation: 公开了用于使用信道估计来估计多径信道的延迟扩展或RMS延迟扩展的低复杂算法，导致低的总功耗。 根据本发明的实施例，基于作为信道估计的函数计算的度量来确定多路径信道的延迟扩展或RMS延迟扩展。 在另一个实施例中，除了用于估计延迟扩展或RMS延迟扩展的度量之外，考虑平均信噪比。 在另一个实施例中，基于平均信噪比和在子载波信道估计之间的斜率的函数的度量来估计多径信道的延迟扩展或RMS延迟扩展。 本发明还涉及用于估计多路径信道的延迟扩展或RMS延迟扩展的装置。

公开(公告)号：US07065330B2

公开(公告)日：2006-06-20

申请号：US10432549

申请日：2001-11-07

Applicant: Mats Klingberg ,  Scott Leyonhjelm

Inventor： Mats Klingberg ,  Scott Leyonhjelm

IPC: H04Q11/12 ,  H04B1/00

CPC classification number: H04B1/04 ,  H03F1/34 ,  H03F3/24 ,  H04B2001/0433 ,  H04B2001/0491

Abstract: A transmitter comprises a device (20) for frequency up-conversion of a communication signal having at least two consecutive frequency conversion stages, a power amplifier (27) for amplifying the output signal therefrom for obtaining a transmission signal and means (29) for extracting the transmission signal. It also has a device for frequency down-conversion of said extracted transmission signal to the same frequency as the communication signal before said up-conversion for creating a feedback signal. Said two devices use the same local oscillators (25, 26). The transmitter also has means for signal parameter adaptation of the communication signal on basis of the feedback signal for obtaining a desired character of the transmission signal. The frequency down-conversion device comprises a local oscillator combiner (30) producing a combined frequency signal used for frequency down-conversion of the transmission signal reducing the number of conversion stages in the path of the extracted transmission signal with respect to the corresponding number of the frequency up-conversion device.

Abstract translation: 发射机包括用于对具有至少两个连续变频级的通信信号进行频率上变频的装置（20），用于放大其输出信号以获得发射信号的功率放大器（27）和用于提取的装置（29） 传输信号。 它还具有用于所述提取的发送信号的频率下变频到与所述上变频之前的通信信号相同的频率的装置，用于产生反馈信号。 所述两个器件使用相同的本地振荡器（25,26）。 发射机还具有用于基于用于获得传输信号的期望字符的反馈信号的通信信号的信号参数自适应的装置。 降频转换装置包括本地振荡器组合器（30），其产生用于传输信号的频率下变频的组合频率信号，减少提取的发送信号的路径中的转换级数相对于相应数量的 升频转换装置。

公开(公告)号：US08559546B2

公开(公告)日：2013-10-15

申请号：US12993394

申请日：2008-05-19

Applicant: Scott Leyonhjelm ,  Melvyn Pereira ,  Aaron Reid

Inventor： Scott Leyonhjelm ,  Melvyn Pereira ,  Aaron Reid

IPC: H04L1/06

CPC classification number: H04L27/2659 ,  H04L5/0023 ,  H04L25/0202 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695

Abstract: The present invention relates to methods and an apparatus for estimating a residual frequency error. According to an embodiment, an expected vector for selected subcarriers of a received symbol is estimated using a channel estimate vector and a reference vector; a sampling frequency mismatch is removed and a dot product is calculated using the expected and a received vector. An angle of the product is estimated and a change in angle from a previous symbol is calculated. The residual frequency is estimated using the calculated change in angle. In another embodiment, an expected subcarrier is estimated based on a channel estimate and on a reference subcarrier, an angle and magnitude of the multiplication between the expected and a received subcarrier are estimated; a phase offset is removed; a weighted mean value of the angles is calculated and the residual frequency error is estimated using a change in weighted mean angle.

Abstract translation: 本发明涉及用于估计残余频率误差的方法和装置。 根据实施例，使用信道估计向量和参考向量来估计接收符号的所选子载波的期望向量; 取样频率失配，使用预期和接收矢量计算点积。 估计产品的角度并计算与先前符号的角度的变化。 使用计算的角度变化来估计残差频率。 在另一个实施例中，基于信道估计和在参考子载波上估计预期副载波，估计预期和接收副载波之间的乘法的角度和幅度; 移除相位偏移; 计算角度的加权平均值，并使用加权平均角度的变化来估计残差频率误差。

公开(公告)号：US06943627B2

公开(公告)日：2005-09-13

申请号：US10487873

申请日：2002-08-09

Applicant: Scott Leyonhjelm ,  Vimar Björk ,  John Grass ,  Lennart Neovius ,  Paul Leather

Inventor： Scott Leyonhjelm ,  Vimar Björk ,  John Grass ,  Lennart Neovius ,  Paul Leather

IPC: H03F1/32 ,  H03F1/26

CPC classification number: H03F1/3247

Abstract: The invention provides robust and non-invasive calibration of an adaptive signal conditioning system having a signal conditioning block in the signal path to a signal conversion system, and a feedback path with a number of feedback components for enabling adaptation, by means of a parameter adaptation block, of the parameters used in the signal conditioning. In order to calibrate the feedback path, a well-defined reference signal is inserted into the feedback path, and an appropriate calibration coefficient is then determined by a coefficient calibrator in response to the received reference signal. The calibration coefficient is provided to a compensator, which effectively compensates for changes in the transfer characteristics of the feedback path due to factors such as variations in ambient temperature and component aging. Accordingly, the feedback signal transferred over the calibrated feedback path will be an accurate representation of the output signal of the signal conversion system, thus allowing accurate adaptive signal conditioning.

Abstract translation: 本发明提供了一种自适应信号调理系统的鲁棒和非侵入性校准，该自适应信号调节系统在信号转换系统的信号路径中具有信号调节块，以及具有多个用于启用适应的反馈分量的反馈路径，借助于参数自适应 块，信号调理中使用的参数。 为了校准反馈路径，将明确定义的参考信号插入到反馈路径中，然后由系数校准器响应于接收到的参考信号确定适当的校准系数。 校准系数被提供给补偿器，该补偿器由于诸如环境温度和部件老化的变化等因素而有效地补偿反馈路径的传递特性的变化。 因此，通过校准的反馈路径传送的反馈信号将是信号转换系统的输出信号的精确表示，从而允许精确的自适应信号调理。