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公开(公告)号：US07551547B2
公开(公告)日：2009-06-23
申请号：US11046192
申请日：2005-01-28
申请人： Arunabha Ghosh
发明人： Arunabha Ghosh
IPC分类号： H04J11/00
CPC分类号： H04L27/2647 , H04L25/0216 , H04L25/022
摘要： A transmitted symbol matrix and a received symbol vector are transformed based on a non-identity transformation. The non-identity transformation is based on a finite spread of a channel impulse response in a time domain and is usable to improve accuracy of channel estimation in a frequency domain. A transformed channel vector is determined based on the transformed transmitted symbol matrix and the transformed received symbol vector using a channel estimation method. One or more elements in the transformed channel vector are suppressed to at or about zero. The suppressed, transformed channel vector is inverse transformed into an estimated channel vector based on the non-identity transformation.
摘要翻译： 基于非标识变换来变换发送符号矩阵和接收符号向量。 非同一性变换基于时域中的信道脉冲响应的有限扩展，并且可用于提高频域中的信道估计的精度。 使用信道估计方法，基于变换的发送符号矩阵和变换的接收符号向量来确定变换信道向量。 经变换的信道向量中的一个或多个元素被抑制到或大约为零。 抑制的，变换的信道向量被逆变换为基于非同一性变换的估计信道向量。
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公开(公告)号：US20090074115A1
公开(公告)日：2009-03-19
申请号：US12241843
申请日：2008-09-30
CPC分类号： H04L25/03318 , H03M13/23 , H03M13/4107 , H03M13/6362 , H04L25/03197 , H04L2025/03401
摘要： A system and method of decoding data are provided. A particular method includes determining a first partially collapsed metric value for each bit in a symbol transition, where each first partially collapsed metric value is a cumulative metric of starting in a first state and ending in a second state in L transitions. The first partially collapsed metric value is equal to the cumulative metric value for each of the states plus first minimum sum of branch metric values.
摘要翻译： 提供了一种解码数据的系统和方法。 特定方法包括确定符号转换中每个位的第一部分折叠度量值，其中每个第一部分折叠度量值是在第一状态中开始并在L个转换中以第二状态结束的累积度量。 第一部分折叠度量值等于每个状态的累积度量值加上分支度量值的第一最小和。
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3.发明授权Delay-induced scattering with phase randomization and partitioned frequency hopping 失效相位随机化和分频跳频的延迟诱导散射公开(公告)号：US07336694B2
公开(公告)日：2008-02-26
申请号：US10683891
申请日：2003-10-10
申请人： Arunabha Ghosh
发明人： Arunabha Ghosh
IPC分类号： H04B1/00
CPC分类号： H04B1/713 , H04B1/715 , H04B7/2621 , H04B7/2643 , H04B2001/7154 , H04N19/63
摘要： A first copy and a second copy of a signal, which comprises a plurality of TDMA frames, are transmitted from the same antenna. Relative to the first copy, the second copy of the signal has a fixed delay and a random phase. The random phase changes from one of the TDMA frames to another of the TDMA frames. A group of hopping carrier frequencies are partitioned into at least two sets of carrier frequencies. The first copy and the second copy of the signal are transmitted using a sequence of the hopping carrier frequencies, wherein consecutive pairs of the hopping carrier frequencies for consecutive pairs of the TDMA frames are not from the same one of the at least two sets.
摘要翻译： 从同一天线发送包括多个TDMA帧的信号的第一副本和第二副本。 相对于第一副本，信号的第二副本具有固定的延迟和随机相位。 随机相位从TDMA帧之一改变到TDMA帧中的另一个。 一组跳频载频被划分成至少两组载波频率。 使用跳频载波频率的序列来发送信号的第一拷贝和第二副本，其中连续的TDMA帧对的连续的跳频载波对不是来自至少两个集合中的相同的一个。
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公开(公告)号：US20060171297A1
公开(公告)日：2006-08-03
申请号：US11046192
申请日：2005-01-28
申请人： Arunabha Ghosh
发明人： Arunabha Ghosh
CPC分类号： H04L27/2647 , H04L25/0216 , H04L25/022
摘要： A transmitted symbol matrix and a received symbol vector are transformed based on a non-identity transformation. The non-identity transformation is based on a finite spread of a channel impulse response in a time domain and is usable to improve accuracy of channel estimation in a frequency domain. A transformed channel vector is determined based on the transformed transmitted symbol matrix and the transformed received symbol vector using a channel estimation method. One or more elements in the transformed channel vector are suppressed to at or about zero. The suppressed, transformed channel vector is inverse transformed into an estimated channel vector based on the non-identity transformation.
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5.发明申请Delay-induced scattering with phase randomization and partitioned frequency hopping 失效相位随机化和分频跳频的延迟诱导散射公开(公告)号：US20050078650A1
公开(公告)日：2005-04-14
申请号：US10683891
申请日：2003-10-10
申请人： Arunabha Ghosh
发明人： Arunabha Ghosh
CPC分类号： H04B1/713 , H04B1/715 , H04B7/2621 , H04B7/2643 , H04B2001/7154 , H04N19/63
摘要： A first copy and a second copy of a signal, which comprises a plurality of TDMA frames, are transmitted from the same antenna. Relative to the first copy, the second copy of the signal has a fixed delay and a random phase. The random phase changes from one of the TDMA frames to another of the TDMA frames. A group of hopping carrier frequencies are partitioned into at least two sets of carrier frequencies. The first copy and the second copy of the signal are transmitted using a sequence of the hopping carrier frequencies, wherein consecutive pairs of the hopping carrier frequencies for consecutive pairs of the TDMA frames are not from the same one of the at least two sets.
摘要翻译： 从同一天线发送包括多个TDMA帧的信号的第一副本和第二副本。 相对于第一副本，信号的第二副本具有固定的延迟和随机相位。 随机相位从TDMA帧之一改变到TDMA帧中的另一个。 一组跳频载频被划分成至少两组载波频率。 使用跳频载波频率的序列来发送信号的第一副本和第二副本，其中连续的TDMA帧对的连续的跳频载波对不是来自至少两个集合中的相同的一个。
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公开(公告)号：US07986614B2
公开(公告)日：2011-07-26
申请号：US12467764
申请日：2009-05-18
申请人： Arunabha Ghosh
发明人： Arunabha Ghosh
IPC分类号： H04J11/00
CPC分类号： H04L27/2647 , H04L25/0216 , H04L25/022
摘要： A method is disclosed that includes channel estimation for a multi-carrier modulation of a plurality of subcarriers. The method includes performing a first channel estimation to obtain a first estimate of a channel based on a received signal. The method further includes suppressing a portion of elements of the first estimate of the channel to obtain a suppressed estimate of the channel. The method also includes multiplying the suppressed estimate of the channel by a first matrix to obtain a delay restricted estimate of the channel.
摘要翻译： 公开了一种包括用于多个子载波的多载波调制的信道估计的方法。 该方法包括执行第一信道估计以基于接收到的信号获得信道的第一估计。 该方法还包括抑制信道的第一估计的元素的一部分以获得信道的抑制估计。 该方法还包括将抑制的信道估计乘以第一矩阵以获得信道的延迟限制估计。
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公开(公告)号：US07450668B2
公开(公告)日：2008-11-11
申请号：US11049370
申请日：2005-02-02
CPC分类号： H04L25/03318 , H03M13/23 , H03M13/4107 , H03M13/6362 , H04L25/03197 , H04L2025/03401
摘要： First and second partially collapsed metric values are determined for each bit in a symbol transition. Each first partially collapsed metric value is a cumulative metric of starting in a first state and ending in a second state in L transitions with the respective bit in the symbol transition being a first value. Each second partially collapsed metric value is a cumulative metric of starting in the first state and ending in the second state in L transitions with the respective bit in the symbol transition being a second value, the second value differing from the first value. For each bit in the symbol transition, a relative likelihood value is determined based on its respective first and second partially collapsed metric values. A symbol is decoded based on a hard decision performed using the relative likelihood value for each bit in the symbol transition.
摘要翻译： 为符号转换中的每个位确定第一和第二部分折叠度量值。 每个第一部分折叠的度量值是在第一状态中开始并在L个转换中以第二状态结束的累积度量，其中符号转换中的相应位是第一值。 每个第二部分折叠度量值是在第一状态中开始并在L个转换中以第二状态结束的累积度量，其中符号转换中的相应位是第二值，第二值与第一值不同。 对于符号转换中的每个位，基于其相应的第一和第二部分折叠度量值来确定相对似然值。 基于使用符号转换中的每个位的相对似然值执行的硬判决来对符号进行解码。
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公开(公告)号：US20070080783A1
公开(公告)日：2007-04-12
申请号：US11248761
申请日：2005-10-11
申请人： Arunabha Ghosh , Anil Doradla
发明人： Arunabha Ghosh , Anil Doradla
CPC分类号： H01Q1/2208
摘要： A system and method for controlling the performance of a RFID network comprising a plurality of RFID tags and a central unit is disclosed. Each of the plurality of RFID tags is operative to transmit a data packet comprising a unique identification for that RFID tag. Additionally, each RFID tag is operative to receive a data packet from another RFID tag of the plurality of RFID tags, make a random determination based on a probability whether to re-transmit the data packet, and re-transmit the received data packet dependent on the random determination. The central unit in communication with the plurality of RFID tags is operative to receive the data packets from the plurality of RFID tags.
摘要翻译： 公开了一种用于控制包括多个RFID标签和中央单元的RFID网络的性能的系统和方法。 多个RFID标签中的每一个可操作地发送包括该RFID标签的唯一标识的数据分组。 另外，每个RFID标签可操作以从多个RFID标签的另一个RFID标签接收数据包，基于是否重传数据包的概率进行随机确定，并且依赖于 随机确定。 与多个RFID标签通信的中央单元可操作以从多个RFID标签接收数据分组。
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公开(公告)号：US20060171489A1
公开(公告)日：2006-08-03
申请号：US11049370
申请日：2005-02-02
申请人： Arunabha Ghosh , Richard Kobylinski
发明人： Arunabha Ghosh , Richard Kobylinski
IPC分类号： H03D1/00
CPC分类号： H04L25/03318 , H03M13/23 , H03M13/4107 , H03M13/6362 , H04L25/03197 , H04L2025/03401
摘要： First and second partially collapsed metric values are determined for each bit in a symbol transition. Each first partially collapsed metric value is a cumulative metric of starting in a first state and ending in a second state in L transitions with the respective bit in the symbol transition being a first value. Each second partially collapsed metric value is a cumulative metric of starting in the first state and ending in the second state in L transitions with the respective bit in the symbol transition being a second value, the second value differing from the first value. For each bit in the symbol transition, a relative likelihood value is determined based on its respective first and second partially collapsed metric values. A symbol is decoded based on a hard decision performed using the relative likelihood value for each bit in the symbol transition.
摘要翻译： 为符号转换中的每个位确定第一和第二部分折叠度量值。 每个第一部分折叠的度量值是在第一状态中开始并在L个转换中以第二状态结束的累积度量，其中符号转换中的相应位是第一值。 每个第二部分折叠度量值是在第一状态中开始并在L个转换中以第二状态结束的累积度量，其中符号转换中的相应位是第二值，第二值与第一值不同。 对于符号转换中的每个位，基于其相应的第一和第二部分折叠度量值来确定相对似然值。 基于使用符号转换中的每个位的相对似然值执行的硬判决来对符号进行解码。
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公开(公告)号：US08305874B2
公开(公告)日：2012-11-06
申请号：US13163996
申请日：2011-06-20
申请人： Arunabha Ghosh
发明人： Arunabha Ghosh
IPC分类号： H04J11/00
CPC分类号： H04L27/2647 , H04L25/0216 , H04L25/022
摘要： A method includes performing a channel estimation to obtain an estimate of the channel based on a received signal. A subset of elements of the estimate are suppressed to obtain a suppressed estimate of the channel. The method includes multiplying the suppressed estimate of the channel by a matrix to obtain a delay restricted estimate of the channel.
摘要翻译： 一种方法包括执行信道估计以基于接收信号获得信道的估计。 抑制估计的元素的子集以获得抑制的信道估计。 该方法包括将抑制的信道估计乘以矩阵以获得信道的延迟受限估计。
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