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公开(公告)号：US06370357B1
公开(公告)日：2002-04-09
申请号：US09217064
申请日：1998-12-21
申请人： Chengshan Xiao , Karl D. Mann , Jan C. Olivier
发明人： Chengshan Xiao , Karl D. Mann , Jan C. Olivier
IPC分类号： H04B1700
摘要： For a hierarchical mobile cellular communications system comprising a plurality of microcells and overlaid macrocells, a method is disclosed for estimating the speed of a mobile. The speed estimate assists in the assignment of slow-moving mobiles to microcells and fast-moving mobiles to macrocells, thus keeping the cellular system in optimum utilization. The method first calculates a power signal of the received signals. The power signal is then filtered and decimated. The speed of a mobile is estimated from a determination of the offset autocorrelation of the filtered and decimated power signal.
摘要翻译： 对于包括多个微小区和重叠的宏小区的分级移动蜂窝通信系统，公开了一种用于估计移动台的速度的方法。 速度估计有助于将缓慢移动的移动站分配给微小区和快速移动的移动站到宏小区，从而保持蜂窝系统的最佳利用。 该方法首先计算接收信号的功率信号。 然后对功率信号进行滤波和抽取。 从确定滤波和抽取的功率信号的偏移自相关来估计移动台的速度。
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公开(公告)号：US20190058529A1
公开(公告)日：2019-02-21
申请号：US15945198
申请日：2018-04-04
申请人： YAHONG ROSA ZHENG , WEIMIN DUAN , CHENGSHAN XIAO
发明人： YAHONG ROSA ZHENG , WEIMIN DUAN , CHENGSHAN XIAO
摘要： Systems and methods for underwater communication using a SISO acoustic channel. An acoustic receiver may receive a signal comprising information encoded in at least one transmitted symbol. Using a Bi-SDFE, the at least one transmitted symbol is estimated. The Bi-SDFE may include a SDFE and a time-reversed SDFE that each output bit extrinsic LLRs, which are combined into combined bit extrinsic LLRs. The estimated symbol is then mapped to the combined bit extrinsic LLRs, the result of which is de-interleaved. Iterative bit extrinsic LLRs are generated with a MAP and/or soft-decision decoder using the mapped, combined bit extrinsic LLRs as a priori LLRs for the Bi-SDFE in another iterative estimation. The iterative bit extrinsic LLRs are interleaved and transmitted for use by the Bi-SDFE in another iterative estimation. After a plurality of iterations, a hard decision of the transmitted symbol is generated with the MAP and/or soft-decision decoder.
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3.发明授权Method and apparatus for estimating fading distortion of a signal propagating in a communication channel 有权用于估计在通信信道中传播的信号的衰落失真的方法和装置公开(公告)号：US06510190B1
公开(公告)日：2003-01-21
申请号：US09213154
申请日：1998-12-17
IPC分类号： H04L700
CPC分类号： H04L1/20
摘要： The present invention relates to a method and an apparatus for compensating a signal that has experienced fading distortion in a communication channel. The signal that can be a TDMA (Time Division Multiple Access) signal includes slots that carry data symbols. Non-uniformly spaced pilot symbols are also embedded in the slot structure. The receiver separates the incoming symbols stream in two parts namely a pilot symbols stream and data symbols stream. Since the transmitted pilot symbols are known, an estimate of the channel distortion on the pilot symbols locations can be computed. This estimate is then interpolated to provide an estimate of the fading distortion at the data symbols locations, thus allowing to compensate accurately for the fading distortion in the channel.
摘要翻译： 本发明涉及一种补偿在通信信道中经历衰落失真的信号的方法和装置。 可以是TDMA（时分多址）信号的信号包括携带数据符号的时隙。 非均匀间隔的导频符号也嵌入槽结构中。 接收机将输入符号流分成两部分，即导频符号流和数据符号流。 由于发送的导频符号是已知的，因此可以计算导频符号位置处的信道失真的估计。 然后对该估计进行内插以提供数据符号位置处的衰落失真的估计，从而允许准确地补偿信道中的衰落失真。
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公开(公告)号：US20200280375A1
公开(公告)日：2020-09-03
申请号：US16821816
申请日：2020-03-17
申请人： Yahong Rosa Zheng , Weimin Duan , Chengshan Xiao
发明人： Yahong Rosa Zheng , Weimin Duan , Chengshan Xiao
摘要： Aspects of the present disclosure include methods for communication using a MIMO channel, such as an acoustic channel for underwater communication. An acoustic receiver may receive a signal comprising information encoded in at least one transmitted symbol. Using a two-layer iterative process, the at least one transmitted symbol is estimated. The first layer of the two-layer process uses iterative exchanges of soft-decisions between an adaptive turbo equalizer and a MAP decoder. The second layer of the two-layer process uses a data-reuse procedure that adapts an equalizer vector of both a feedforward filter and a serial interference cancellation filter of the adaptive turbo equalizer using a posteriori soft decisions of the at least one transmitted symbol. After a plurality of iterations, a hard decision of the bits encoded on the at least one transmitted symbol is output from the MAP decoder.
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5.发明授权Method and apparatus for equalization and data symbol detection for MPSK modulation 有权用于MPSK调制的均衡和数据符号检测的方法和装置公开(公告)号：US06512802B1
公开(公告)日：2003-01-28
申请号：US09407248
申请日：1999-09-28
申请人： Jan C. Olivier , Chengshan Xiao
发明人： Jan C. Olivier , Chengshan Xiao
IPC分类号： H04L2722
CPC分类号： H04L25/0216 , H04L25/0224 , H04L25/0244 , H04L25/03178
摘要： A method and an apparatus for detecting data symbols of a multiple-phase-shift-keying (MPSK) modulated slot used for radio reception of digital data are disclosed. The method and apparatus simultaneously accomplish signal equalization and symbol detection. A simplified algorithm is used which is sub-optimal but closely approximates an optimal solution which significantly reduces computational load. A solution vector is constructed and data symbol values in the solution vector are perturbated. After each perturbation, a solution error is computed to determine whether the perturbated value provides a better solution. Perturbation continues until an optimal solution is found or a maximum number of iterations have been performed. The advantage is an improved, cost-effective radio receiver which enables faster wireless data transfer.
摘要翻译： 公开了一种用于检测用于数字数据的无线电接收的多相移键控（MPSK）调制槽的数据符号的方法和装置。 该方法和装置同时实现信号均衡和符号检测。 使用一个简单的算法，它是次优的，但是接近一个最大的解决方案，大大减少了计算量。 构造解向量，解矢量中的数据符号值被扰动。 在每个扰动之后，计算解决误差以确定扰动值是否提供了更好的解决方案。 扰动继续，直到找到最佳解或最大次数迭代。 优点是改进的，具有成本效益的无线电接收机，其能够实现更快的无线数据传输。
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公开(公告)号：US11652557B2
公开(公告)日：2023-05-16
申请号：US16821816
申请日：2020-03-17
申请人： Yahong Rosa Zheng , Weimin Duan , Chengshan Xiao
发明人： Yahong Rosa Zheng , Weimin Duan , Chengshan Xiao
CPC分类号： H04B13/02 , H04B11/00 , H04L25/03057 , H04L27/0008 , H04L2025/03426 , H04L2025/03636
摘要： Aspects of the present disclosure include methods for communication using a MIMO channel, such as an acoustic channel for underwater communication. An acoustic receiver may receive a signal comprising information encoded in at least one transmitted symbol. Using a two-layer iterative process, the at least one transmitted symbol is estimated. The first layer of the two-layer process uses iterative exchanges of soft-decisions between an adaptive turbo equalizer and a MAP decoder. The second layer of the two-layer process uses a data-reuse procedure that adapts an equalizer vector of both a feedforward filter and a serial interference cancellation filter of the adaptive turbo equalizer using a posteriori soft decisions of the at least one transmitted symbol. After a plurality of iterations, a hard decision of the bits encoded on the at least one transmitted symbol is output from the MAP decoder.
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公开(公告)号：US20190068294A1
公开(公告)日：2019-02-28
申请号：US15686390
申请日：2017-08-25
申请人： Yahong Rosa Zheng , Weimin Duan , Chengshan Xiao
发明人： Yahong Rosa Zheng , Weimin Duan , Chengshan Xiao
摘要： Systems and methods for underwater communication using a MIMO acoustic channel. An acoustic receiver may receive a signal comprising information encoded in at least one transmitted symbol. Using a two-layer iterative process, the at least one transmitted symbol is estimated. The first layer of the two-layer process uses iterative exchanges of soft-decisions between an adaptive turbo equalizer and a MAP decoder. The second layer of the two-layer process uses a data-reuse procedure that adapts an equalizer vector of both a feedforward filter and a serial interference cancellation filter of the adaptive turbo equalizer using a posteriori soft decisions of the at least one transmitted symbol. After a plurality of iterations, a hard decision of the bits encoded on the at least one transmitted symbol is output from the MAP decoder.
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