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1.发明申请公开(公告)号：US20050094740A1
公开(公告)日：2005-05-05
申请号：US10699386
申请日：2003-10-31
IPC分类号： H04K1/10 , H04L20060101
CPC分类号： H04L27/34 , H04L1/0625 , H04L1/0631 , H04L1/0656
摘要： A multi-level space time signal constellation that is optimized for use with a multi-carrier, multi-path communication scheme includes points on a first level separated from points on a mutually exclusive second level by a minimum distance that is based on a conditional probability distribution, preferably a Kullback-Leibler (KL) distance. Points within one level may be separated by a Euclidean distance, but spherical levels are rotated relative to one another to maximize a minimum inter-level KL distance. A receiver uses pilot symbols to estimate the channels and two-stage symbol detection, determining in one stage the constellation level and in another stage the point in the level. The receiver calculates a likelihood function based on a conditional distribution which does not reduce to the Euclidean-based nearest-neighbor detector. A single stored constellation may be scaled based on received signal to noise ratio. Each constellation defines n=2M real dimensions, wherein M is the number of transmit antennas.
摘要翻译： 优化用于多载波多路径通信方案的多级时空信号星座包括在相互排斥的第二级别上的点之间的第一级上的点与基于条件概率的最小距离的点 分布，最好是Kullback-Leibler（KL）距离。 一个级别内的点可以通过欧几里德距离分开，但是球面水平相对于彼此旋转以使最小跨越距离KL距离最大化。 接收机使用导频符号来估计信道和两级符号检测，在一个阶段中确定星座级别，在另一级中确定该级别中的点。 接收机基于不减少到基于欧几里德的最近邻检测器的条件分布来计算似然函数。 可以基于接收到的信噪比来缩放单个存储的星座。 每个星座定义n = 2M个实际维度，其中M是发射天线的数量。
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公开(公告)号：US07394865B2
公开(公告)日：2008-07-01
申请号：US10607406
申请日：2003-06-25
IPC分类号： H04L27/00
CPC分类号： H04L5/0007 , H04L5/0021 , H04L5/0048 , H04L25/022 , H04L25/0226 , H04L27/0008 , H04L27/3405 , H04L27/3455
摘要： A signal constellation for wireline or wireless multi-carrier communication systems, such as systems using OFDM or MC-CDMA, has points separated from one another by maximizing a distance between conditional probability distributions, such as a Kullbeck-Leibler (KL) distance. Preferably, the constellation points are arranged in concentric circles, with or without a point at the origin, wherein adjacent circles are rotated to maximize an angular distance between points on adjacent circles. Pilot symbols inserted in the transmitted signal are used by a receiver to estimate the channel of the multi-carrier system. Different constellations show optimum performance for different signal to noise ratios, and for different numbers of taps used to estimate the channel, especially in a fast fading environment where there may be fewer pilots per OFDM or MC-CDMA symbol than channel taps.
摘要翻译： 用于有线或无线多载波通信系统的信号星座（例如使用OFDM或MC-CDMA的系统）通过使条件概率分布（例如Kullbeck-Leibler（KL））距离之间的距离最大化而具有彼此分离的点。 优选地，星座点以同心圆排列，具有或不具有原点的点，其中相邻的圆圈被旋转以最大化相邻圆上的点之间的角距离。 接收机使用插入发送信号的导频符号来估计多载波系统的信道。 不同的星座显示不同信噪比的最佳性能，以及用于估计信道的不同数量的抽头，特别是在每个OFDM或MC-CDMA符号比通道抽头可能具有较少导频的快衰落环境中。
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3.发明授权公开(公告)号：US07173973B2
公开(公告)日：2007-02-06
申请号：US10699386
申请日：2003-10-31
CPC分类号： H04L27/34 , H04L1/0625 , H04L1/0631 , H04L1/0656
摘要： A multi-level space time signal constellation that is optimized for use with a multi-carrier, multi-path communication scheme includes points on a first level separated from points on a mutually exclusive second level by a minimum distance that is based on a conditional probability distribution, preferably a Kullback-Leibler (KL) distance. Points within one level may be separated by a Euclidean distance, but spherical levels are rotated relative to one another to maximize a minimum inter-level KL distance. A receiver uses pilot symbols to estimate the channels and two-stage symbol detection, determining in one stage the constellation level and in another stage the point in the level. The receiver calculates a likelihood function based on a conditional distribution which does not reduce to the Euclidean-based nearest-neighbor detector. A single stored constellation may be scaled based on received signal to noise ratio. Each constellation defines n=2M real dimensions, wherein M is the number of transmit antennas.
摘要翻译： 优化用于多载波多路径通信方案的多级时空信号星座包括在相互排斥的第二级别上的点之间的第一级上的点与基于条件概率的最小距离的点 分布，最好是Kullback-Leibler（KL）距离。 一个级别内的点可以通过欧几里德距离分开，但是球面水平相对于彼此旋转以使最小跨越距离KL距离最大化。 接收机使用导频符号来估计信道和两级符号检测，在一个阶段中确定星座级别，在另一级中确定该级别中的点。 接收机基于不减少到基于欧几里德的最近邻检测器的条件分布来计算似然函数。 可以基于接收到的信噪比来缩放单个存储的星座。 每个星座定义n = 2M个实际维度，其中M是发射天线的数量。
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4.发明申请公开(公告)号：US20130148640A1
公开(公告)日：2013-06-13
申请号：US13315923
申请日：2011-12-09
申请人： Wei LI , Jorma Lilleberg , Sami-Jukka Hakola , Samuli Turtinen , Timo Koskela , Anna Pantelidou
发明人： Wei LI , Jorma Lilleberg , Sami-Jukka Hakola , Samuli Turtinen , Timo Koskela , Anna Pantelidou
IPC分类号： H04W84/02
CPC分类号： H04L1/1809 , H04L1/1854
摘要： There is provided a mechanism for controlling a transmission of data in a fragmentation transmission mode. When fragments are transmitted in a fragmentation transmission mode, it is determined whether the fragment frame is received successfully or whether an acknowledgment message for confirming a successful transmission of the fragment frame is received. In case the acknowledgment for the successful transmission of the one fragment frame is not received, or the fragment is frame is not successfully received, the fragmentation transmission mode is maintained and a retransmission of the fragment frame is initiated.
摘要翻译： 提供了一种用于控制分段传输模式下的数据传输的机制。 当以分段传输模式发送片段时，确定片段帧是否被成功接收，或者是否接收到用于确认片段帧的成功发送的确认消息。 在没有接收到对于一个分段帧的成功发送的确认，或者未成功接收到该分段是帧的情况下，维持分段传输模式，并且启动片段帧的重传。
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5.发明授权Methods, computer program products and apparatus providing improved quantization 有权方法，提供改进量化的计算机程序产品和装置公开(公告)号：US08243756B2
公开(公告)日：2012-08-14
申请号：US11827717
申请日：2007-07-12
CPC分类号： H03M7/30
摘要： Thus, the exemplary embodiments of the invention describe methods, computer program products and apparatus that provide improved quantization, as may be useful within the context of a communication system (e.g., a wireless communication system) that has a relay node. In one non-limiting, exemplary embodiment, a method includes: receiving a transmission having source data from an information source; determining an estimate of the source data using a quantization technique based on maximizing data throughput; and transmitting a message including the determined estimate towards an information destination.
摘要翻译： 因此，本发明的示例性实施例描述了在具有中继节点的通信系统（例如，无线通信系统）的上下文中可能有用的提供改进的量化的方法，计算机程序产品和装置。 在一个非限制性的示例性实施例中，一种方法包括：从信息源接收具有源数据的传输; 使用基于最大化数据吞吐量的量化技术来确定源数据的估计; 以及向所述信息目的地发送包括所确定的估计的消息。
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公开(公告)号：US07564906B2
公开(公告)日：2009-07-21
申请号：US10781041
申请日：2004-02-17
申请人： Haifeng Wang , Jorma Lilleberg
发明人： Haifeng Wang , Jorma Lilleberg
IPC分类号： H04L27/28
CPC分类号： H04L27/2602 , H04L25/03866
摘要： A method and transceiver for wireless multicarrier communications. At the transmitter side, conventional OFDM symbols, after inverse fast Fourier Transform, are scrambled in time domain and then guard-interval (GI) inserted, up-converted at the carrier frequency for transmission. At the receiver side, after GI removal and frequency domain channel equalization, the received signal is transformed into time-domain by inverse fast Fourier Transform. The time-domain equalized signal is descrambled in time domain and then transformed back to the frequency domain before it is rate-matched, demodulated and decoded. This time-domain scrambling and descrambling method can be used in a wireless OFDM system such as WLAN, cellular OFDM, and MC-CDMA.
摘要翻译： 一种用于无线多载波通信的方法和收发器。 在发射机侧，在快速傅里叶逆变换之后的常规OFDM符号在时域中加扰，然后在载波频率上插入保护间隔（GI）进行上变频以进行传输。 在接收机侧，GI去除和频域信道均衡后，通过快速傅里叶逆变换将接收信号转换为时域。 时域均衡信号在时域中被解扰，然后在速率匹配，解调和解码之前被转换回到频域。 该时域加扰和解扰方法可用于诸如WLAN，蜂窝OFDM和MC-CDMA的无线OFDM系统中。
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公开(公告)号：US20080101451A1
公开(公告)日：2008-05-01
申请号：US11733503
申请日：2007-04-10
申请人： Haifeng Wang , Jorma Lilleberg , Wei Li , Ming Chen , Shixin Cheng
发明人： Haifeng Wang , Jorma Lilleberg , Wei Li , Ming Chen , Shixin Cheng
IPC分类号： H03K5/159
CPC分类号： H04L25/03159 , H04L5/0007 , H04L25/0212 , H04L25/0232 , H04L27/2647 , H04L2025/03414
摘要： An approach is provided for subblock-wise frequency domain equalization, wherein a data block of a received signal is segmented into at least two subblocks at a receiving end of a transmission channel. The subblocks are then equalized separately in the frequency domain, and equalized subblocks are combined to obtain an equalized signal. Thereby, Doppler induced interference can be suppressed to achieve enhanced robustness to high Doppler and compensate performance degradation due to rapidly varying channels.
摘要翻译： 提供了一种用于子块频域均衡的方法，其中接收信号的数据块在传输信道的接收端被分段成至少两个子块。 然后在频域中分别对子块进行均衡，并且组合均衡的子块以获得均衡的信号。 因此，可以抑制多普勒感应干扰以实现对高多普勒的增强的鲁棒性并且补偿由于快速变化的信道而导致的性能下降。
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8.发明授权公开(公告)号：US06700926B1
公开(公告)日：2004-03-02
申请号：US09710936
申请日：2000-11-13
IPC分类号： H04B138
CPC分类号： H03M13/25 , H04L1/0618
摘要： A method for optimizing a bit-to-symbol mapping operation. The method has steps of (a) determining a most probable symbol selection error made during a space-time decoding operation; and (b) selecting a bits-to-symbol mapper such that a bit-to-symbol mapping step results in a most probable symbol selection error, made during a space-time decoding operation, causes a minimal number of bit errors. The bits-to-symbol mapping step can be carried out so as to minimize an average number of bit errors resulting from an occurrence of the most probable symbol selection error, as well as from an occurrence of at least a second most probable symbol selection error, during the space-time decoding operation. A space-time coded communications system that operates in accordance with the method is also disclosed.
摘要翻译： 用于优化位到符号映射操作的方法。 该方法具有以下步骤：（a）确定在空时解码操作期间产生的最可能的符号选择错误; 以及（b）选择比特到符号映射器，使得比特到符号映射步骤导致在空时解码操作期间产生的最可能的符号选择错误导致最小数量的位错误。 可以执行比特到符号映射步骤，以便最小化由最可能的符号选择错误的发生导致的平均比特错误数，以及从至少第二最可能符号选择错误的发生 ，在空时解码操作期间。 还公开了根据该方法操作的时空编码通信系统。
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公开(公告)号：US5881097A
公开(公告)日：1999-03-09
申请号：US742064
申请日：1996-10-31
申请人： Jorma Lilleberg , Markku Juntti
发明人： Jorma Lilleberg , Markku Juntti
CPC分类号： H04B1/707
摘要： A receiving method and a receiver comprising circuit elements that are arranged to calculate estimates for parameters of a received signal in two or more stages, for processing the signal iteratively by means of an observation time-slot of a given length and containing a plurality of samples, and for sliding the observation time-slot over the received samples. In order to avoid complicated matrix operations, the receiver comprises circuit elements for sliding the observation time-slot in such a way that successive observation time-slots partly overlap, and for employing, upon calculating the estimates and decisions of parameters in each observation time-slot, estimates provided by the previous observation time-slot as initial values for those samples that fall within the previous observation time-slot, and estimates provided by the previous stage for those samples that do not fall within the previous observation time-slot.
摘要翻译： 一种接收方法和接收机，包括电路元件，其被布置成以两级或更多级计算接收信号的参数的估计，用于通过给定长度的观测时隙迭代地处理信号并且包含多个采样 并且用于在所接收的样本上滑动观察时隙。 为了避免复杂的矩阵运算，接收机包括用于滑动观测时隙的电路元件，使得连续观测时隙部分重叠，并且在计算每个观测时间段中的参数的估计和决定时， 时隙，由先前观察时隙提供的估计值作为落在先前观察时隙内的那些采样的初始值，以及由前一级为不在前一观测时隙内的那些采样提供的估计。
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公开(公告)号：US09661476B2
公开(公告)日：2017-05-23
申请号：US14124305
申请日：2011-06-09
申请人： Haifeng Wang , Zhenhong Li , Jorma Lilleberg , Ting Zhou , Jing Xu
发明人： Haifeng Wang , Zhenhong Li , Jorma Lilleberg , Ting Zhou , Jing Xu
CPC分类号： H04W4/08 , H04L12/189 , H04W4/06 , H04W8/186 , H04W72/005 , H04W76/40
摘要： A method is provided for facilitating multicast service. The method may include receiving data multicast to members of a multicast group. The method may further include determining, based at least in part on an indication received during multicast of the data, that a late joining device has joined the multicast group subsequent to initiation of the multicast. The method may additionally include marking, based at least in part on the received indication, a point at which the late joining device began to participate in the multicast. A corresponding apparatus and computer program product are also provided.
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