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公开(公告)号：US07457366B2
公开(公告)日：2008-11-25
申请号：US10675215
申请日：2003-09-30
IPC分类号： H04K1/10
CPC分类号： H04L27/2657 , H04L27/2675 , H04L27/2695
摘要： An OFDM receiver applies phase compensation to subcarriers of data symbols of an OFDM packet. A phase compensation estimate is generated from pilot subcarriers within the data symbol and applied to the subcarriers of the data symbol prior to demapping. The pilot subcarriers of the data symbol are combined and weighted to generate an observation vector. Recursive filtering is performed on the observation vector to generate the phase compensation estimate. The recursive filtering may include performing an extended Kalman-type filtering (EKF) operation on the observation vector using a channel estimate, an additive noise power estimate, a signal to noise ratio (SNR) estimate and a priori information about a dynamic model of the phase noise spectrum of transceiver oscillators. The channel estimate may be generated from a long training symbol of the OFDM packet, and the additive noise power estimate and the SNR estimate may be generated from short training symbols of the OFDM packet.
摘要翻译： OFDM接收机对OFDM分组的数据符号的子载波进行相位补偿。 从数据符号内的导频子载波产生相位补偿估计，并将其应用于解映射之前的数据符号的子载波。 数据符号的导频子载波被组合和加权以产生观测向量。 对观测向量进行递归滤波，生成相位补偿估计。 递归滤波可以包括使用信道估计，加性噪声功率估计，信噪比（SNR）估计和有关动态模型的先验信息对观测向量执行扩展卡尔曼型滤波（EKF） 收发器振荡器的相位噪声谱。 可以从OFDM分组的长训练符号生成信道估计，并且可以从OFDM分组的短训练符号生成加性噪声功率估计和SNR估计。
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2.发明授权System and method for selecting data rates to provide uniform bit loading of subcarriers of a multicarrier communication channel 有权用于选择数据速率以提供多载波通信信道的子载波的均匀位加载的系统和方法公开(公告)号：US07333556B2
公开(公告)日：2008-02-19
申请号：US10815035
申请日：2004-03-30
IPC分类号： H04L27/00
CPC分类号： H04L5/0046 , H04L1/0003 , H04L1/0009 , H04L1/0025 , H04L1/203 , H04L5/0007 , H04L5/0023 , H04L5/006 , Y02D50/10
摘要： A data rate is selected for subcarriers of each frequency and spatial channel of a slowly varying frequency selective multicarrier channel to provide uniform bit loading (UBL) for faster link adaptation. Signal to noise ratios (SNRs) for subcarriers of the multicarrier communication channel may be calculated from channel state information and a transmit power level. A throughput may be estimated for the data rates from the SNRs and one of the data rates may be selected based on the estimated throughputs.
摘要翻译： 为慢速变化的频率选择多载波信道的每个频率和空间信道的子载波选择数据速率，以提供用于更快链路适配的均匀比特加载（UBL）。 可以从信道状态信息和发射功率电平计算多载波通信信道的子载波的信噪比（SNR）。 可以根据SNR估计数据速率的吞吐量，并且可以基于估计的吞吐量来选择一个数据速率。
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3.发明授权公开(公告)号：US07899125B2
公开(公告)日：2011-03-01
申请号：US11812283
申请日：2007-06-18
申请人： Alexander A. Maltsev , Alexey E. Rubtsov , Ali S. Sadri , Andrey V. Pudeyev , Sergey Tiraspolsky , Alexey Davydov
发明人： Alexander A. Maltsev , Alexey E. Rubtsov , Ali S. Sadri , Andrey V. Pudeyev , Sergey Tiraspolsky , Alexey Davydov
IPC分类号： H04L27/28
CPC分类号： H04L27/2628
摘要： A transmitter may include a set of stream groups, each including two or more streams producing a set of orthogonal frequency division multiplexed (OFDM) stream-symbols and a coding unit interleaving the stream-symbols into an interleaved signal. An input bit multiplexer may route an input data signal to be divided among each of the streams. An inverse fast Fourier transform unit may operate on a combined signal formed from interleaving the interleaved signals from each stream group. Each stream may include for example a baseband signal processor producing the OFDM stream-symbols.
摘要翻译： 发射机可以包括一组流组，每组包括产生一组正交频分复用（OFDM）流符号的两个或更多个流，以及将流符号交织到交织信号中的编码单元。 输入位复用器可以路由要在每个流之间划分的输入数据信号。 反相快速傅立叶变换单元可以对从每个流组交织的交错信号形成的组合信号进行操作。 每个流可以包括例如产生OFDM流符号的基带信号处理器。
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公开(公告)号：US07460876B2
公开(公告)日：2008-12-02
申请号：US10330675
申请日：2002-12-30
CPC分类号： H04W52/42 , H04B7/0615 , H04L27/2601 , H04W52/24
摘要： Briefly, an adaptive transmitted power control scheme, which may be used in stations of a communication system, for example, a wireless communication system. The scheme may allocate transmission power to a communication station based on multiplying each of at least one transmitted subcarrier complex number by a corresponding subcarrier weight. Additionally, a detection scheme may detect whether a transmitted power control scheme according to an embodiment of the invention is used by stations of the communication system. The allocation of transmission power may be also used to transmit additional service information through channels.
摘要翻译： 简而言之，可以在通信系统的站中使用的自适应发射功率控制方案，例如无线通信系统。 该方案可以基于将至少一个发送的子载波复数中的每一个乘以相应的子载波权重来向通信站分配发送功率。 此外，检测方案可以检测根据本发明的实施例的发射功率控制方案是否由通信系统的站使用。 传输功率的分配也可用于通过信道传输附加业务信息。
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5.发明授权Multicarrier communication system and methods for link adaptation using uniform bit loading and subcarrier puncturing 有权多载波通信系统和使用均匀比特加载和子载波穿孔的链路自适应的方法公开(公告)号：US07570953B2
公开(公告)日：2009-08-04
申请号：US10862535
申请日：2004-06-07
IPC分类号： H04W72/00
CPC分类号： H04L27/2608 , H04L1/0003 , H04L1/0009 , H04L5/0007 , H04L5/0023 , H04L5/0042 , H04L5/0046 , H04L5/0053 , H04L5/006 , H04L5/0085 , H04L5/0096 , H04W52/34 , H04W52/42
摘要： Transmission parameters for a multicarrier communication channel are selected by setting a power level for each subcarrier of an active set of subcarriers, and calculating the channel capacity based on the power levels and effective noise powers. The number of active subcarriers of the set is decreased, the power levels are reset and the channel capacity is recalculated until a final set of active subcarriers result that provide the highest channel capacity.
摘要翻译： 通过设置有效的子载波组的每个子载波的功率电平，并且基于功率电平和有效噪声功率来计算信道容量来选择多载波通信信道的传输参数。 集合中的有效子载波数量减少，功率电平被重置，并且重新计算信道容量，直到有效子载波的最终集合产生提供最高信道容量。
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6.发明授权Adaptive multicarrier wireless communication system, apparatus and associated methods 有权自适应多载波无线通信系统，装置及相关方法公开(公告)号：US07286609B2
公开(公告)日：2007-10-23
申请号：US10738689
申请日：2003-12-16
CPC分类号： H04W52/346 , H04L1/0003 , H04L1/0009 , H04L5/0007 , H04L5/0023 , H04L5/0042 , H04L5/0046 , H04L5/0053 , H04L5/006 , H04L5/0085 , H04L5/0096 , H04L25/0204 , H04L25/0212 , H04L25/022 , H04W52/42
摘要： An adaptive multicarrier wireless communication system, apparatus and associated methods are generally disclosed herein. In at least one embodiment, channel state information is used to perform bit loading and power allocation within a multicarrier system. In an example technique, after active subcarriers have been identified for a multicarrier channel and an initial power distribution has been made, a subset of active subcarriers may be found that exceed a channel quality performance threshold. Excess power may then be identified by determining how much power could be reduced in the identified subcarriers so that they still meet, but do not exceed the channel quality performance threshold. In one possible approach, the excess power may be re-allocated to other subcarrier subsets.
摘要翻译： 本文一般公开了一种自适应多载波无线通信系统，装置和相关方法。 在至少一个实施例中，信道状态信息用于执行多载波系统内的比特加载和功率分配。 在示例性技术中，在已经为多载波信道识别出活动副载波并且进行了初始功率分配之后，可以发现超过信道质量性能阈值的活动子载波的子集。 然后可以通过确定在所识别的子载波中可以减少多少功率使得它们仍然满足但不超过信道质量性能阈值来识别过量的功率。 在一种可能的方法中，可以将剩余功率重新分配给其他子载波子集。
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7.发明申请公开(公告)号：US20080310526A1
公开(公告)日：2008-12-18
申请号：US11812283
申请日：2007-06-18
申请人： Alexander A. Maltsev , Alexey E. Rubtsov , Ali S. Sadri , Andrey V. Pudeyev , Sergey Tiraspolsky , Alexey Davydov
发明人： Alexander A. Maltsev , Alexey E. Rubtsov , Ali S. Sadri , Andrey V. Pudeyev , Sergey Tiraspolsky , Alexey Davydov
IPC分类号： H04J11/00
CPC分类号： H04L27/2628
摘要： A transmitter may include a set of stream groups, each including two or more streams producing a set of orthogonal frequency division multiplexed (OFDM) stream-symbols and a coding unit interleaving the stream-symbols into an interleaved signal. An input bit multiplexer may route an input data signal to be divided among each of the streams. An inverse fast Fourier transform unit may operate on a combined signal formed from interleaving the interleaved signals from each stream group. Each stream may include for example a baseband signal processor producing the OFDM stream-symbols.
摘要翻译： 发射机可以包括一组流组，每组包括产生一组正交频分复用（OFDM）流符号的两个或更多个流，以及将流符号交织到交织信号中的编码单元。 输入位复用器可以路由要在每个流之间划分的输入数据信号。 反相快速傅立叶变换单元可以对从每个流组交织的交错信号形成的组合信号进行操作。 每个流可以包括例如产生OFDM流符号的基带信号处理器。
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