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公开(公告)号：US07463867B2
公开(公告)日：2008-12-09
申请号：US11386891
申请日：2006-03-22
CPC分类号： H04B7/0413 , H04B7/0667 , H04B7/0669 , H04B7/0891 , H04B17/345 , H04L1/0002 , H04L1/0003 , H04L1/0009 , H04L1/0025 , H04L1/0618 , H04L1/1671 , H04L1/1809 , H04W52/42
摘要： A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.
摘要翻译： 通过多径无线通信系统进行通信的速率自适应方法使用多个链路，使得链路的每一端使用多个发射和接收天线。 基于整个系统性能测量来确定要为每个链路传输的多个独立流。 此外，系统还可以基于整个系统性能测量来共同确定每个链路的最佳调制，编码，功率控制和频率分配。 在OFDM系统中，独立流的数量以及调制，编码和功率控制可以基于整个系统性能测量在逐个音调的基础上确定。
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22.发明授权Rate-adaptive methods for communicating over multiple input/multiple output wireless systems 有权用于通过多个输入/多输出无线系统通信的速率自适应方法公开(公告)号：US07058367B1
公开(公告)日：2006-06-06
申请号：US10356439
申请日：2003-01-31
IPC分类号： H04B7/02
CPC分类号： H04B7/0413 , H04B7/0667 , H04B7/0669 , H04B7/0891 , H04B17/345 , H04L1/0002 , H04L1/0003 , H04L1/0009 , H04L1/0025 , H04L1/0618 , H04L1/1671 , H04L1/1809 , H04W52/42
摘要： A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.
摘要翻译： 通过多径无线通信系统进行通信的速率自适应方法使用多个链路，使得链路的每一端使用多个发射和接收天线。 基于整个系统性能测量来确定要为每个链路传输的多个独立流。 此外，系统还可以基于整个系统性能测量来共同确定每个链路的最佳调制，编码，功率控制和频率分配。 在OFDM系统中，独立流的数量以及调制，编码和功率控制可以基于整个系统性能测量在逐个音调的基础上确定。
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公开(公告)号：US6044120A
公开(公告)日：2000-03-28
申请号：US850132
申请日：1997-05-01
申请人： Israel Bar-David , Glenn David Golden , Thomas Louis Marzetta , Nelson Ray Sollenberger , Jack Harriman Winters
发明人： Israel Bar-David , Glenn David Golden , Thomas Louis Marzetta , Nelson Ray Sollenberger , Jack Harriman Winters
IPC分类号： H04B7/08
CPC分类号： H04B7/0854
摘要： An apparatus for performance improvement of a digital wireless receiver comprises a processing circuit for processing a plurality of received signals and providing a processed signal, wherein a plurality of weights is applied to the plurality of received signals producing a plurality of weighted received signals. The plurality of weighted received signals are combined to provide the processed signal. A weight generation circuit generates the plurality of weights, wherein weights are generated so as to solve a minimization problem that penalizes excessive time variability in the weights.
摘要翻译： 一种用于数字无线接收机的性能改进的装置包括处理电路，用于处理多个接收信号并提供处理的信号，其中多个权重被应用于产生多个加权接收信号的多个接收信号。 多个加权接收信号被组合以提供经处理的信号。 权重生成电路生成多个权重，其中生成权重以便解决惩罚权重中的过多时间变化性的最小化问题。
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公开(公告)号：US06590533B2
公开(公告)日：2003-07-08
申请号：US10155380
申请日：2002-05-24
IPC分类号： G01S124
CPC分类号： H04W52/283 , G01S5/02 , H04W4/02 , H04W4/90 , H04W8/18 , H04W52/367 , H04W52/50 , H04W76/50
摘要： A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone, the call including a dialed number and a TDMA signal. In the transmitting step, the base station transmits a control message to the mobile telephone when the dialed number meets a predetermined criterion, such as being 911. The control message instructs the mobile telephone to transmit the TDMA signal at a maximum power. In the increasing step, the mobile telephone increases the TDMA signal to maximum power in response to the control message. Then in the determining step, location information for the mobile telephone is determined based on at least one characteristic of the TDMA signal received at at least one of the first base station and other base stations. In an alternate embodiment, the method is practiced in a mobile telephone and the power level is automatically increased in response to the dialed number meeting a predetermined criterion.
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公开(公告)号：US06278752B1
公开(公告)日：2001-08-21
申请号：US08850738
申请日：1997-05-02
IPC分类号： H04B110
摘要： A system and method for generating a coherent reference signal for extracting desired user signals from received signals even after error propagation is underway, are presented. A data symbol preceding a sequence whose relative phases are known is used as an absolute phase reference. Since errors in detection of the phase reference symbol are usually caused by error propagation already underway, the sequence can be used to reacquire the desired signal with merely an absolute phase shift in detected data, which allows accurate differential detection of the desired user signal even in the absence of absolute phase knowledge.
摘要翻译： 提出了即使在错误传播之后也产生用于从接收信号中提取所需用户信号的相干参考信号的系统和方法。 使用相对相位已知的序列之前的数据符号作为绝对相位参考。 由于相位参考符号的检测中的误差通常是由正在进行的误差传播引起的，所以该序列可用于仅在所检测的数据中用绝对相移来重新获取期望的信号，这允许精确的差分检测期望的用户信号，即使在 缺乏绝对阶段的知识。
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26.发明授权Output signal modification providing phase amplified information for soft decision decoding 失效输出信号修改提供用于软判决解码的相位放大信息
公开(公告)号：US6125152A
公开(公告)日：2000-09-26
申请号：US695492
申请日：1996-08-12
CPC分类号： H04B1/0007 , H04B1/0003 , H04B1/28 , H04B1/38 , H04B7/0854 , H04L1/06 , H04L27/22
摘要： An improvement of a digital wireless receiver comprises a processing circuit for processing a plurality of received signals, and providing a processed signal having an amplitude; and an adjusting circuit for adjusting the amplitude of the processed signal, the adjusting circuit coupled to the processing circuit, where the adjusting circuit adjusts the amplitude as a function of distortion of the plurality of received signals. The processing circuit can weight and combine the plurality of received signals. The distortion can be estimated from a squared error of the plurality of received signals, which can be averaged over a sliding window. The function can comprise multiplying the processed signal by square root of the averaged squared error. Such amplitude adjustment is useful to maintain the soft decision information for the processed signal that is fed to a base station having soft decision decoding, or can be used in the base station with soft decoding.
摘要翻译： 数字无线接收机的改进包括处理电路，用于处理多个接收信号，并提供具有振幅的处理信号; 以及用于调整处理信号的幅度的调整电路，调整电路耦合到处理电路，其中调整电路根据多个接收信号的失真调整幅度。 处理电路可以对多个接收信号进行加权和组合。 可以从多个接收信号的平方误差估计失真，其可以在滑动窗口上进行平均。 该功能可以包括将经处理的信号乘以平均平方误差的平方根。 这种幅度调整对于维持馈送到具有软判决解码的基站的处理信号的软判决信息是有用的，或者可以在具有软解码的基站中使用。
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27.发明授权Adaptive communication system and method using unequal weighting of interface and noise 失效自适应通信系统和方法使用接口和噪声的不平等权重
公开(公告)号：US5819168A
公开(公告)日：1998-10-06
申请号：US850027
申请日：1997-05-01
CPC分类号： H01Q3/2611 , H04B1/126 , H04B7/0865
摘要： A communication system and method, particularly adapted for use in adaptive antenna arrays, are presented. A plurality of signals containing a desired signal, interference, and noise are received through an array of antennas connected to a base receiving station. The signal arriving at each antenna is weighted according to computations which adjust those weights as a function of received interference and noise power in an unequal manner, based on the estimation accuracy of the interference and noise, which in turn depends on factors such as interference to noise power ratios and fading rate.
摘要翻译： 提出了一种特别适用于自适应天线阵列的通信系统和方法。 通过连接到基站接收站的天线阵列来接收包含所需信号，干扰和噪声的多个信号。 根据计算，根据干扰和噪声的估计精度，根据接收到的干扰和噪声功率的函数调整这些权重的计算来对每个天线的到达信号进行加权，反过来依赖于干扰和噪声的干扰 噪声功率比和衰落速率。
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公开(公告)号：US20090003489A1
公开(公告)日：2009-01-01
申请号：US12151419
申请日：2008-05-06
申请人： Ye Li , Nelson Ray Sollenberger
发明人： Ye Li , Nelson Ray Sollenberger
IPC分类号： H04L27/06
CPC分类号： H04L27/2647 , H04L5/023 , H04L25/0204 , H04L25/0242
摘要： An improved OFDM receiver is realized by employing a simplified delay function for the transmissions channel. The simplified delay function yields a simplified frequency-domain correlation that is applied to develop an Eigen matrix U that is used in developing estimates of the channels. Those channel estimates are used in the receiver to develop the output signals.
摘要翻译： 通过对传输信道采用简化的延迟函数来实现改进的OFDM接收机。 简化的延迟函数产生一个简化的频域相关性，用于开发用于开发信道估计的特征矩阵U。 在接收机中使用这些信道估计来开发输出信号。
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公开(公告)号：US06327314B1
公开(公告)日：2001-12-04
申请号：US09089862
申请日：1998-06-03
IPC分类号： H03D100
CPC分类号： G01S3/72 , H01Q3/2605 , H04L25/022 , H04L27/2647
摘要： A method and apparatus provide channel estimation for multicarrier systems. A minimum mean-square-error (MMSE) channel estimator makes full use of time-and frequency-domain correlations of the frequency response of time-varying dispersive fading channels. A robust channel estimator that is insensitive to the channel statistics is provided. The robust channel estimator can significantly improve the performance of a multicarrier system such as an orthogonal frequency division multiplexing (OFDM) modulation system in a rapid dispersive fading channel. In addition, the estimation process can employ a new reference generator which can select the source of the reference signal as being a decoded or undecoded signal depending on the correction success rate of the decoder.
摘要翻译： 一种方法和装置为多载波系统提供信道估计。 最小均方误差（MMSE）信道估计器充分利用时变色散衰落信道的频率响应的时域和频域相关性。 提供对信道统计不敏感的鲁棒信道估计器。 鲁棒的信道估计器可以显着改善快速色散衰落信道中的诸如正交频分复用（OFDM）调制系统的多载波系统的性能。 此外，估计处理可以使用新的参考生成器，其可以根据解码器的校正成功率将参考信号的源选择为解码或未解码的信号。
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公开(公告)号：US06795392B1
公开(公告)日：2004-09-21
申请号：US09535945
申请日：2000-03-27
申请人： Ye Li , Nelson Ray Sollenberger
发明人： Ye Li , Nelson Ray Sollenberger
IPC分类号： H04J1100
CPC分类号： H04L27/2647 , H04L5/023 , H04L25/0204 , H04L25/0242
摘要： An improved OFDM receiver is realized by employing a simplified delay function for the transmissions channel. The simplified delay function yields a simplified frequency-domain correlation that is applied to develop an Eigen matrix U that is used in developing estimates of the channels. Those channel estimates are used in the receiver to develop the output signals.
摘要翻译： 通过对传输信道采用简化的延迟函数来实现改进的OFDM接收机。 简化的延迟函数产生一个简化的频域相关性，用于开发用于开发信道估计的特征矩阵U。 在接收机中使用这些信道估计来开发输出信号。
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