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公开(公告)号：US5946351A
公开(公告)日：1999-08-31
申请号：US777335
申请日：1996-12-27
CPC分类号： H04L25/03057 , H04L7/04
摘要： A decision feedback equalizer receiver that assigns a number F of feedforward filter taps and optimizes digital receiver performance in multipath channel environments, where F is an integer less than a memory length of a radio channel. The feedforward filter taps are assigned to delay times corresponding to an optimum burst timing parameter delay time, d(0), and to F-1 time delays based on "tap SNR indices." For an Uncorrelated Inter-Symbol-Interference (UISI) case, the F-1 time delays are the first F-1 rank ordered time delays are selected as the feedforward tap delay times. For a general case, a combination of the UISI case and an analytical two cluster case is obtained by selecting the first F-2 rank ordered time delays and a 2D time delay, where D is the delay time corresponding to the largest estimated tap SNR index.
摘要翻译： 分配前馈滤波器抽头数量F的判决反馈均衡器接收器，并且在多径信道环境中优化数字接收器性能，其中F是小于无线电信道的存储器长度的整数。 前馈滤波器抽头被分配给对应于最佳突发定时参数延迟时间d（0）的延迟时间，并分配给基于“抽头SNR指数”的F-1时间延迟。 对于不相关的符号间干扰（UISI）情况，F-1时间延迟是第一个F-1等级有序时间延迟作为前馈抽头延迟时间。 对于一般情况，通过选择第一F-2秩有序时间延迟和2D时间延迟来获得UISI情况和分析两个群集情况的组合，其中D是对应于最大估计抽头SNR指数的延迟时间 。
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公开(公告)号：US08433258B2
公开(公告)日：2013-04-30
申请号：US13048573
申请日：2011-03-15
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.
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3.发明授权Method and system for reduction of peak-to-average power ratio of transmission signals comprising overlapping waveforms 有权用于降低包括重叠波形的传输信号的峰值与平均功率比的方法和系统公开(公告)号：US08064853B2
公开(公告)日：2011-11-22
申请号：US12605264
申请日：2009-10-23
CPC分类号： H04L27/2623 , H04B1/0475 , H04B7/2628 , H04B2201/70706 , H04L27/2614 , H04L27/2621
摘要： 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.
摘要翻译： 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。
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4.发明授权OFDM communication system and method having a reduced peak-to-average power ratio 有权OFDM通信系统和方法具有降低的峰均功率比公开(公告)号：US07995602B2
公开(公告)日：2011-08-09
申请号：US12490050
申请日：2009-06-23
CPC分类号： H04L27/2615 , H04B1/06 , H04L27/2601 , H04L27/2621 , H04L27/2626 , H04L27/2647
摘要： An OFDM system embeds sequence information in the transmitted signal that reduces peak average power ratio (PAP) with minimal impact on the overall system efficiency. A marker is embedded onto the transmitted information that is used to identify the combining (inversion) sequence at the receiver. In one embodiment, selected tones in a cluster are rotated when the corresponding phase factor rotates the cluster.
摘要翻译： OFDM系统在传输信号中嵌入序列信息，降低峰值平均功率比（PAP），对整个系统的效率影响最小。 标记被嵌入到用于识别接收机上的组合（反转）序列的所发送的信息上。 在一个实施例中，当对应的相位因子旋转群集时，群集中的所选音调被旋转。
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公开(公告)号：US20110176599A1
公开(公告)日：2011-07-21
申请号：US13048573
申请日：2011-03-15
IPC分类号： H04B17/00
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：US07929925B2
公开(公告)日：2011-04-19
申请号：US12832664
申请日：2010-07-08
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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7.发明授权Method and apparatus for enhanced 911 location using power control in a wireless system 有权在无线系统中使用功率控制来增强911位置的方法和装置公开(公告)号：US06972717B2
公开(公告)日：2005-12-06
申请号：US10456052
申请日：2003-06-06
IPC分类号： G01S19/06 , G01S5/02 , H04W4/02 , H04W4/22 , H04W8/18 , H04W52/28 , H04W52/36 , H04W52/50 , G01S1/24
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.
摘要翻译： 定位移动电话的方法包括接收，发送，增加和确定的步骤。 在接收步骤中，第一基站从移动电话接收呼叫，呼叫包括拨号号码和TDMA信号。 在发送步骤中，当拨打的号码符合预定标准（例如911）时，基站向移动电话发送控制消息。控制消息指示移动电话以最大功率发送TDMA信号。 在增加的步骤中，移动电话响应于控制消息将TDMA信号增加到最大功率。 然后在确定步骤中，基于在第一基站和其他基站中的至少一个接收的TDMA信号的至少一个特性来确定移动电话的位置信息。 在替代实施例中，该方法在移动电话中实现，并且响应于符合预定标准的拨号号码自动增加功率电平。
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8.发明授权Combined simulcasting and dedicated services in a wireless communication system 有权在无线通信系统中组合的联播和专用服务公开(公告)号：US06885630B2
公开(公告)日：2005-04-26
申请号：US09753894
申请日：2001-01-03
IPC分类号： H04B7/185 , H04H20/67 , H04L5/02 , H04L12/56 , H04W4/06 , H04W72/04 , H04W74/02 , H04W74/04 , H04W84/04 , H04J3/00 , H04J11/00
CPC分类号： H04W72/005 , H04B7/18523 , H04H20/67 , H04L5/023 , H04W52/0206 , H04W52/0216 , H04W72/0446 , H04W84/042 , Y02D70/164 , Y02D70/26 , Y02D70/446
摘要： An efficient method for providing both dedicated and simulcast services over a common wireless infrastructure is described. The services can be available to a single terminal as well as to a multiplicity of terminals simultaneously. The method uses time division multiplexing and orthogonal frequency division multiple access for simulcasting information and transmitting dedicated message information from a plurality of base stations forming a cellular pattern over the same wireless frequency channel. The method comprises the steps of constructing frames for transmission by the plurality of base stations comprising control information, simulcast information and dedicated message information within predetermined time slots of the frames and allocating the simulcast information and the dedicated message information to time slots of the same frame predetermined by the control information of the frame. The underlying modulation technology used is OFDM and thereby the channel delay-dispersion is minimized.
摘要翻译： 描述了通过公共无线基础设施提供专用和联播服务的有效方法。 这些服务可以同时用于单个终端以及多个终端。 该方法使用时间复用和正交频分多址接入用于同播信息，并且通过同一无线频率信道从形成蜂窝模式的多个基站发送专用消息信息。 该方法包括以下步骤：在帧的预定时隙内构成包括控制信息，联播信息和专用消息信息的多个基站的帧，并将同播信息和专用消息信息分配给同一帧的时隙 由帧的控制信息预先设定。 所使用的基础调制技术是OFDM，从而最小化信道延迟分散。
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9.发明授权Method and system for reducing of peak-to-average power ratio of transmission signals comprising overlapping waveforms 有权用于降低包括重叠波形的传输信号的峰值与平均功率比的方法和系统公开(公告)号：US06556557B1
公开(公告)日：2003-04-29
申请号：US09324487
申请日：1999-06-02
IPC分类号： H04B7216
CPC分类号： H04L27/2623 , H04B1/0475 , H04B7/2628 , H04B2201/70706 , H04L27/2614 , H04L27/2621
摘要： 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.
摘要翻译： 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。
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10.发明授权Method and apparatus for enhanced 911 location using power control in a wireless system 有权在无线系统中使用功率控制来增强911位置的方法和装置公开(公告)号：US06404388B1
公开(公告)日：2002-06-11
申请号：US09489477
申请日：2000-01-21
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.
摘要翻译： 定位移动电话的方法包括接收，发送，增加和确定的步骤。 在接收步骤中，第一基站从移动电话接收呼叫，呼叫包括拨号号码和TDMA信号。 在发送步骤中，当拨打的号码符合预定标准（例如911）时，基站向移动电话发送控制消息。控制消息指示移动电话以最大功率发送TDMA信号。 在增加的步骤中，移动电话响应于控制消息将TDMA信号增加到最大功率。 然后在确定步骤中，基于在第一基站和其他基站中的至少一个接收的TDMA信号的至少一个特性来确定移动电话的位置信息。 在替代实施例中，该方法在移动电话中实现，并且响应于符合预定标准的拨号号码自动增加功率电平。
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