公开(公告)号：US07920635B2

公开(公告)日：2011-04-05

申请号：US11892963

申请日：2007-08-28

申请人： Olli Piirainen

发明人： Olli Piirainen

IPC分类号： H04L27/28

CPC分类号： H03F1/02 ,  H04L27/2623

摘要： There is provided a method of clipping a transmission signal. The method comprises: providing a residual signal of a complex envelope clipper based on the transmission signal to be clipped; providing a reference signal respective to the residual signal, the reference signal corresponding to an ideal residual signal; forming a clipping signal on the basis of the residual signal and the reference signal; subtracting the clipping signal from the residual signal for removing higher amplitudes of the residual signal; and subtracting the clipping signal from the reference signal for providing a reference signal respective to the clipped residual signal.

摘要翻译： 提供了一种限制传输信号的方法。 该方法包括：基于待剪切的传输信号提供复信封限幅器的残留信号; 提供相应于残留信号的参考信号，所述参考信号对应于理想的残余信号; 基于残留信号和参考信号形成限幅信号; 从残差信号中减去削波信号，以去除残留信号的较高幅度; 以及从所述参考信号中减去所述限幅信号，以提供与所述限幅残差信号相对应的参考信号。

公开(公告)号：US07561648B2

公开(公告)日：2009-07-14

申请号：US10494207

申请日：2002-10-30

申请人： Olli Piirainen

发明人： Olli Piirainen

IPC分类号： H04B1/10

CPC分类号： H04L27/2331 ,  H04L2027/0065

摘要： There is disclosed a technique for generating an improved estimate of the frequency error in a received signal, and more particularly the application of such a technique in the equalization circuitry of a wireless network element.

摘要翻译： 公开了一种用于产生对接收信号中的频率误差的改进估计的技术，更具体地说，这种技术在无线网元的均衡电路中的应用。

公开(公告)号：US07561643B1

公开(公告)日：2009-07-14

申请号：US10111533

申请日：1999-10-27

申请人： Olli Piirainen

发明人： Olli Piirainen

IPC分类号： H03D1/04 ,  H03D1/06

CPC分类号： H04L25/0212 ,  H04L25/0228 ,  H04L25/025 ,  H04L25/062

摘要： A method of simultaneously determining a DC offset and a channel impulse response from a received signal in a mobile communication system. The received signal Y comprising a set of training sequence bits that have been modulated prior to transmission. The modulated signals experience a certain phase shift and are rotated by a certain angle. The received signal may also comprise a DC offset component ADC that needs to be removed. By manipulation of the received signal samples with the knowledge of the original training sequence TRS and method of modulation used, it is possible to simultaneously estimate the communication channel's impulse response H and the DC offset ADC by finding the Least Square solution to a linear equation, such that the energy of the noise term introduced into the communication channel may be kept to a minimum.

摘要翻译： 一种在移动通信系统中同时确定来自接收信号的DC偏移和信道脉冲响应的方法。 接收信号Y包括在发送之前被调制的一组训练序列比特。 调制信号经历一定的相移并旋转一定角度。 所接收的信号还可以包括需要去除的DC偏移分量ADC。 通过利用原始训练序列TRS和所使用的调制方法的知识来操纵接收到的信号样本，可以通过找到线性方程的最小二乘解来同时估计通信信道的脉冲响应H和DC偏移ADC， 使得引入通信信道的噪声项的能量可以保持最小。

公开(公告)号：US07542734B2

公开(公告)日：2009-06-02

申请号：US11247324

申请日：2005-10-12

申请人： Olli Piirainen

发明人： Olli Piirainen

IPC分类号： H03C7/02 ,  H04B1/02 ,  H04B7/02 ,  H04L1/02

CPC分类号： H04B7/0697 ,  H04B7/063

摘要： The invention provides a data transmission solution in a telecommunication system. According to the invention, a data transmission scheme is selected for a first transceiver unit, which comprises a plurality of transmit antennas, on the basis of the quality of a communication link and transmit antenna correlation information associated with the first transceiver unit, from a list including at least the following data transmission schemes: transmitting different data from each antenna of the first transceiver unit, the data transmitted from one antenna being independent of the data transmitted from another antenna; and transmitting the same data from each antenna of the first transceiver unit and controlling the direction of the transmitted data according to the properties of a radio channel. The selection of the data transmission scheme is carried out during an active communication link between the first and a second transceiver unit.

摘要翻译： 本发明提供一种电信系统中的数据传输解决方案。 根据本发明，从列表中选择基于通信链路的质量和与第一收发器单元相关联的发射天线相关信息的第一收发器单元的数据传输方案，其包括多个发射天线 至少包括以下数据传输方案：从第一收发器单元的每个天线发送不同数据，从一个天线发送的数据独立于从另一个天线发送的数据; 并且从第一收发器单元的每个天线发送相同的数据，并且根据无线电信道的属性来控制所发送的数据的方向。 在第一和第二收发器单元之间的主动通信链路期间执行数据传输方案的选择。

公开(公告)号：US20080240311A1

公开(公告)日：2008-10-02

申请号：US11806836

申请日：2007-06-04

申请人： Olli Piirainen ,  Markku Vainikka ,  Juha P. Karjalainen

发明人： Olli Piirainen ,  Markku Vainikka ,  Juha P. Karjalainen

IPC分类号： H04L27/06

CPC分类号： H04L27/2657 ,  H04L27/2636 ,  H04L27/2675 ,  H04L27/2684 ,  H04L2027/003 ,  H04L2027/0038

摘要： A frequency error correction scheme applicable in a receiver of a mobile telecommunication system is presented. The present frequency error correction scheme is carried out in a time domain after an equalization process. The present frequency error correction scheme may be applied to a base station receiving signals transmitted according to a single-carrier frequency division multiple access communication scheme. The separation of different received signals for further processing is carried out in the frequency domain before the equalization and the frequency error correction.

摘要翻译： 提出了适用于移动电信系统接收机的频率纠错方案。 本频率纠错方案在均衡处理之后的时域中进行。 本频率纠错方案可以应用于接收根据单载波频分多址通信方案发送的信号的基站。 用于进一步处理的不同接收信号的分离在均衡和频率误差校正之前的频域中进行。

公开(公告)号：US20070173271A1

公开(公告)日：2007-07-26

申请号：US11642551

申请日：2006-12-21

申请人： Jari Hulkkonen ,  Olli Piirainen

发明人： Jari Hulkkonen ,  Olli Piirainen

IPC分类号： H04Q7/20

CPC分类号： H04W72/082 ,  H04B1/1027 ,  H04L27/2601 ,  H04L27/3488

摘要： A network element, a terminal and a method of allocating a radio channel to a connection between a terminal and a base station in a telecommunication system are provided. The number and properties of potential interferers in a plurality of available radio channels are determined, and channel allocation is performed on the basis of the determination.

摘要翻译： 提供了一种网络元件，终端以及在电信系统中为终端和基站之间的连接分配无线电信道的方法。 确定多个可用无线电信道中的潜在干扰源的数量和性质，并且基于该确定来执行信道分配。

公开(公告)号：US06895044B2

公开(公告)日：2005-05-17

申请号：US10001156

申请日：2001-11-01

申请人： Aki Happonen ,  Olli Piirainen

发明人： Aki Happonen ,  Olli Piirainen

IPC分类号： H04J3/00 ,  H04B7/005 ,  H04B17/318 ,  H04L1/20 ,  H03K5/59

CPC分类号： H04L1/20 ,  H04B17/318

摘要： The present invention proposes a method for estimating a signal variance of a received signal (y) transmitted via a transmission channel, said method comprising the steps of: estimating the energy (RSSI) of the received signal (y), estimating the energy (Emax) of channel impulse response (h) taps, and estimating said signal variance (VAR) of said received signal by subtracting said estimated energy of channel impulse response taps (Emax) from said estimated energy (RSSI) of said received signal, such that said signal variance is obtained as VAR=RSSI−Emax. The present invention also proposes a correspondingly adapted device.

摘要翻译： 本发明提出了一种用于估计经由传输信道发送的接收信号（y）的信号方差的方法，所述方法包括以下步骤：估计接收信号（y）的能量（RSSI），估计能量（Emax ），并且通过从所述接收信号的所述估计能量（RSSI）中减去所述信道脉冲响应抽头（Emax）的所述估计能量来估计所述接收信号的所述信号方差（VAR），使得所述信号脉冲响应 获得信号方差为VAR = RSSI-Emax。 本发明还提出了一种相应适应的装置。

公开(公告)号：US06724841B2

公开(公告)日：2004-04-20

申请号：US09934034

申请日：2001-08-21

申请人： Olli Piirainen

发明人： Olli Piirainen

IPC分类号： H03D104

CPC分类号： H04L25/03057 ,  H04L2025/03407 ,  H04L2025/03477 ,  H04L2025/0349 ,  H04L2025/03617

摘要： The present invention proposes a method for processing signals in order to remove waveform distortion by using an equalizer, said method comprising the steps of receiving an incoming signal, preprocessing said incoming signal, estimating a channel impulse response from said received signal estimating a noise energy from said received signal, calculating filter taps by using said estimated channel impulse response and said noise energy, filtering said received signal by using said calculated filter taps by a feedforward filter means, and supplying said received signal to an equalizer means which comprises a feedback filter, to obtain a resulting signal by a decision in said equalizer means, wherein said estimated channel impulse response is partitioned into at least two parts, in said calculating step of the filter taps one of said parts of said channel impulse response being used for calculating filter taps in said calculating step of the filter taps by using a weight function.

摘要翻译： 本发明提出了一种用于处理信号以便通过使用均衡器来消除波形失真的方法，所述方法包括以下步骤：接收输入信号，预处理所述输入信号，从所述接收信号估计信道脉冲响应，估计噪声能量 所述接收信号，通过使用所述估计的信道脉冲响应和所述噪声能量来计算滤波器抽头，通过使用所述计算的滤波器抽头由前馈滤波器装置对所述接收信号进行滤波，并将所述接收信号提供给包括反馈滤波器的均衡器装置， 通过所述均衡器装置中的决定来获得结果信号，其中所述估计信道脉冲响应被划分为至少两部分，在所述滤波器的计算步骤中，所述信道脉冲响应的所述部分之一用于计算滤波器抽头 在通过使用加权函数的滤波器抽头的所述计算步骤中。

公开(公告)号：US06721374B2

公开(公告)日：2004-04-13

申请号：US10066803

申请日：2002-02-06

申请人： Olli Piirainen

发明人： Olli Piirainen

IPC分类号： H03D104

CPC分类号： H04B1/123 ,  H04L1/06 ,  H04L25/03057 ,  H04L25/03993 ,  H04L2025/0349 ,  H04L2025/03605

摘要： The invention relates to a method for reducing the effects of noise and to a receiver comprising at least one sampling means (12) for forming sample signals from a received signal. The receiver also comprises a whitening means (30) for converting the noise in the sample signals to white noise and digital filters (41, 42, 43, 44) for filtering the sample signals comprising white noise. The receiver further comprises a computation means (80) for computing filter tap coefficients from a sample signal. Further still, the receiver comprises summers (51, 52), each one of which is arranged to receive a filtered signal from at least one filter and to sum the signals received from the filters to produce first summed signals. The receiver also comprises a detector (60) for summing the first summed signals to produce the actual summed signal and for detecting the actual summed signal.

摘要翻译： 本发明涉及一种降低噪声影响的方法和一种接收机，包括至少一个用于从接收信号形成采样信号的采样装置（12）。 接收机还包括用于将采样信号中的噪声转换为白噪声的白化装置（30）和用于对包括白噪声的采样信号进行滤波的数字滤波器（41,42,43,44）。 接收机还包括用于从采样信号计算滤波器抽头系数的计算装置（80）。 此外，接收机还包括加法器（51,52），其中每一个被布置成从至少一个滤波器接收经过滤波的信号，并且对从滤波器接收的信号求和以产生第一相加信号。 接收机还包括用于对第一相加信号求和以产生实际求和信号并用于检测实际求和信号的检测器（60）。

公开(公告)号：US06473473B1

公开(公告)日：2002-10-29

申请号：US09171683

申请日：1998-10-22

申请人： Olli Piirainen

发明人： Olli Piirainen

IPC分类号： H04L2706

CPC分类号： H04B7/0865

摘要： The invention relates to a method for estimating the quality of a connection and a diversity combination method in a digital radio system in which the signals transmitted are in burst form, the bursts comprising a training sequence; and to a receiver comprising a filter matched to the received signal. To effect simple estimation of the quality of the connection, the receiver comprises means for forming a result vector of at most the length of the training sequence from the symbols of the output signal of the matched filter and the corresponding symbols of the training sequence; means for computing a mean value and variance for the symbols of the result vector; and means for forming a quantity proportional to signal quality as a quotient of the squared mean value of the result vector and the variance of the result vector.

摘要翻译： 本发明涉及一种用于在数字无线电系统中估计连接质量和分集组合方法的方法，其中所发射的信号是突发形式，所述突发包括训练序列; 以及包括与接收信号匹配的滤波器的接收机。 为了实现连接质量的简单估计，接收机包括用于从匹配滤波器的输出信号的符号和训练序列的对应符号形成训练序列的长度最多的结果向量的装置; 用于计算结果向量的符号的平均值和方差的装置; 以及用于形成与信号质量成比例的量作为结果向量的平均值和结果向量的方差的商的装置。