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    Systems and methods for providing adaptive pulse position modulated code division multiple access for ultra-wideband communication links
    1.
    发明授权
    Systems and methods for providing adaptive pulse position modulated code division multiple access for ultra-wideband communication links 有权
    为超宽带通信链路提供自适应脉冲位置调制码分多址的系统和方法

    公开(公告)号：US07187715B2

    公开(公告)日：2007-03-06

    申请号：US10252351

    申请日：2002-09-23

    申请人： Krishna Balachandran ,  Doru Calin ,  Tingfang Ji ,  Joseph H. Kang

    发明人： Krishna Balachandran ,  Doru Calin ,  Tingfang Ji ,  Joseph H. Kang

    IPC分类号： H04B14/04

    CPC分类号： H04B1/7176 ,  H04B2001/6908 ,  H04L25/4902

    摘要： An adaptive pulse position modulated CDMA scheme for use in UWB communications systems is disclosed. A stream of input bits is encoded with spreading code sequence. The spreading code sequence consists of a number of code elements that may have one of two values. Each bit is encoded into a symbol consisting of a predefined number of chips, which are transmitted during a symbol period. Next, at least one code element is associated with each chip in the symbol. Then, an encoded pulse is generated in each chip. Each encoded pulse has a value determined by multiplying the data bit with the code value associated with the particular chip. The encoded pulse is then pulse position modulated by shifting the position of the pulse to a first position or a second position within the chip depending upon the encoded value of the pulse.

    摘要翻译： 公开了一种用于UWB通信系统的自适应脉冲位置调制CDMA方案。 输入比特流用扩展码序列编码。 扩展码序列由可能具有两个值之一的多个代码元素组成。 每个位被编码成由符号周期内发送的预定数量的芯片组成的符号。 接下来，至少一个代码元素与符号中的每个芯片相关联。 然后，在每个芯片中产生编码脉冲。 每个编码脉冲具有通过将数据位与与特定芯片相关联的代码值相乘确定的值。 然后根据脉冲的编码值，将脉冲的位置移位到芯片内的第一位置或第二位置，从而进行脉冲位置调制。

    Variable spacing pulse position modulation for ultra-wideband communication links
    2.
    发明授权
    Variable spacing pulse position modulation for ultra-wideband communication links 有权
    用于超宽带通信链路的可变间隔脉冲位置调制

    公开(公告)号：US07082153B2

    公开(公告)日：2006-07-25

    申请号：US10251954

    申请日：2002-09-23

    申请人： Krishna Balachandran ,  Doru Calin ,  Tingfang Ji ,  Joseph H. Kang

    发明人： Krishna Balachandran ,  Doru Calin ,  Tingfang Ji ,  Joseph H. Kang

    IPC分类号： H04B1/69 ,  H04B7/212 ,  H03K7/04

    CPC分类号： H04B1/7176 ,  H04B2001/6908 ,  H04L25/4902

    摘要： Methods and systems for generating a variable spacing pulse position modulated (VSPPM) signal for transmission across an ultra-wideband communications channel. The variable pulse position modulated spread spectrum signal is created by encoding every M input data bits from an input data stream into a symbol consisting of Nc chips. Each chip is divided into 2M sub-chips and each sub-chip is further divided into Np time slots. A pulse is transmitted for each chip in the symbol. During each chip period, the pulse is placed in the sub-chip corresponding to the binary M-tuple (or symbol) value. A time hopping code sequence consisting of Nc elements with a one-to-one chip association is then applied to each symbol so that the position of each pulse is shifted to the appropriate time slot that corresponds to the time hopping code value.

    摘要翻译： 用于生成用于跨超宽带通信信道传输的可变间隔脉冲位置调制（VSPPM）信号的方法和系统。 可变脉冲位置调制扩频信号是通过将每输入数据流中每M个输入数据位编码成由N个芯片组成的符号来产生的。 每个芯片被分成2个M个子芯片，并且每个子芯片被进一步分成N个时隙。 为符号中的每个芯片发送一个脉冲。 在每个码片周期期间，脉冲被放置在对应于二进制M元组（或符号）值的子芯片中。 然后将由具有一对一芯片关联的N＆lt; c＆gt;元素组成的跳时码序列应用于每个符号，使得每个脉冲的位置被转移到对应于 跳码代码。

    Methods and devices for selecting sets of available sub-channels
    3.
    发明授权
    Methods and devices for selecting sets of available sub-channels 有权
    用于选择可用子通道组的方法和设备

    公开(公告)号：US07990931B2

    公开(公告)日：2011-08-02

    申请号：US12689454

    申请日：2010-01-19

    申请人： Krishna Balachandran ,  Tingfang Ji ,  Joseph H. Kang ,  Wei Luo ,  Hsuan-Jung Su

    发明人： Krishna Balachandran ,  Tingfang Ji ,  Joseph H. Kang ,  Wei Luo ,  Hsuan-Jung Su

    IPC分类号： H04B7/216 ,  H04L27/28

    CPC分类号： H04L27/2608 ,  H04B1/713

    摘要： Information is transmitted over selected, Orthogonal Frequency Division Multiplexed (OFDM) sub-channels to avoid frequencies with unacceptable congestion, noise or interference levels. Using frequency hopping, selected non-contiguous OFDM sub-channels used for transmission may vary with time. Once a group of OFDM sub-channels is selected, a power level and modulation technique may also be selected based on channel quality.

    摘要翻译： 信息通过选定的正交频分复用（OFDM）子信道传输，以避免具有不可接受的拥塞，噪声或干扰电平的频率。 使用跳频，用于传输的所选非连续OFDM子信道可随时间变化。 一旦选择了一组OFDM子信道，也可以基于信道质量来选择功率电平和调制技术。

    METHODS AND DEVICES FOR SELECTING SETS OF AVAILABLE SUB-CHANNELS
    5.
    发明申请
    METHODS AND DEVICES FOR SELECTING SETS OF AVAILABLE SUB-CHANNELS 有权
    选择可用子通道集的方法和设备

    公开(公告)号：US20100118926A1

    公开(公告)日：2010-05-13

    申请号：US12689454

    申请日：2010-01-19

    申请人： Krishna Balachandran ,  Tingfang Ji ,  Joseph H. Kang ,  Wei Luo ,  Hsuan-Jung Su

    发明人： Krishna Balachandran ,  Tingfang Ji ,  Joseph H. Kang ,  Wei Luo ,  Hsuan-Jung Su

    IPC分类号： H04B1/38

    CPC分类号： H04L27/2608 ,  H04B1/713

    摘要： Information is transmitted over selected, Orthogonal Frequency Division Multiplexed (OFDM) sub-channels to avoid frequencies with unacceptable congestion, noise or interference levels. Using frequency hopping, selected non-contiguous OFDM sub-channels used for transmission may vary with time. Once a group of OFDM sub-channels is selected, a power level and modulation technique may also be selected based on channel quality.

    摘要翻译： 信息通过选定的正交频分复用（OFDM）子信道传输，以避免具有不可接受的拥塞，噪声或干扰电平的频率。 使用跳频，用于传输的所选非连续OFDM子信道可随时间变化。 一旦选择了一组OFDM子信道，也可以基于信道质量来选择功率电平和调制技术。

    Methods and devices for selecting sets of available sub-channels
    6.
    发明授权
    Methods and devices for selecting sets of available sub-channels 有权
    用于选择可用子通道组的方法和设备

    公开(公告)号：US07701909B2

    公开(公告)日：2010-04-20

    申请号：US10778191

    申请日：2004-02-17

    申请人： Krishna Balachandran ,  Tingfang Ji ,  Joseph H. Kang ,  Wei Luo ,  Hsuan-Jung Su

    发明人： Krishna Balachandran ,  Tingfang Ji ,  Joseph H. Kang ,  Wei Luo ,  Hsuan-Jung Su

    IPC分类号： H04B7/216

    CPC分类号： H04L27/2608 ,  H04B1/713

    摘要： Information is transmitted over selected, Orthogonal Frequency Division Multiplexed (OFDM) sub-channels to avoid frequencies with unacceptable congestion, noise or interference levels. Using frequency hopping, selected non-contiguous OFDM sub-channels used for transmission may vary with time. Once a group of OFDM sub-channels is selected, a power level and modulation technique may also be selected based on channel quality.

    摘要翻译： 信息通过选定的正交频分复用（OFDM）子信道传输，以避免具有不可接受的拥塞，噪声或干扰电平的频率。 使用跳频，用于传输的所选非连续OFDM子信道可随时间变化。 一旦选择了一组OFDM子信道，也可以基于信道质量来选择功率电平和调制技术。

    Method and apparatus for geolocation estimates in wireless networks
    7.
    发明授权
    Method and apparatus for geolocation estimates in wireless networks 有权
    无线网络中地理位置估计的方法和装置

    公开(公告)号：US07224983B2

    公开(公告)日：2007-05-29

    申请号：US10338222

    申请日：2003-01-08

    申请人： Kenneth C. Budka ,  Doru Calin ,  Tingfang Ji

    发明人： Kenneth C. Budka ,  Doru Calin ,  Tingfang Ji

    IPC分类号： H04Q7/20

    CPC分类号： H04W64/00

    摘要： A method and apparatus for increasing the accuracy and reliability of geolocation estimates for wireless communication networks devices includes calculating a geolocation estimate of a wireless communication device for a plurality of time periods, and selecting from the plurality of calculated geolocation estimates, a most reliable geolocation estimate of the wireless communication device.

    摘要翻译： 一种用于增加无线通信网络设备的地理位置估计的准确性和可靠性的方法和装置包括：计算多个时间段内的无线通信设备的地理位置估计，并从多个计算的地理位置估计中选择最可靠的地理位置估计 的无线通信设备。