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1. 发明申请

US20060227910A1 Receiver DC offset correction 审中-公开
标题翻译：接收机DC偏移校正
公开(公告)号：US20060227910A1
公开(公告)日：2006-10-12
申请号：US11373611
申请日：2006-03-09
申请人： Nangavalli Ramasubramanian , Raghuraman Krishnamoorthi , Krishna Mukkavilli
发明人： Nangavalli Ramasubramanian , Raghuraman Krishnamoorthi , Krishna Mukkavilli
IPC分类号： H03D1/04
CPC分类号： H04L25/06 , H03D3/006 , H03D3/008 , H04B1/30 , H04L27/38
摘要： A system and method are provided for correcting direct current (dc) offset in a wireless communications receiver. The method disconnects the mixer signal input from a received communication signal in an initialization state. An analog signal is accepted from the mixer output and converted into digital signal. A fine correction value is generated and subtracted from the digital signal. Thus, the digital signal amplitude in minimized in response to the initial fine correction value. In a communication state, the communication signals are received at the mixer signal input. The fine correction value is subtracted from a converted digital communication signal, so that the digital communication signal is supplied with a fine corrected dc offset. The method may also generate a coarse correction value to adjust mixer current in the initialization state, and a tracking correction value in the communication state.
摘要翻译：提供了用于校正无线通信接收机中的直流（dc）偏移的系统和方法。该方法在初始化状态下断开来自接收到的通信信号的混频信号输入。模拟信号从混频器输出接受并转换为数字信号。产生精细校正值并从数字信号中减去。因此，响应于初始精细校正值而最小化的数字信号幅度。在通信状态下，在混频器信号输入端接收通信信号。从转换的数字通信信号中减去精细校正值，从而向数字通信信号提供精细校正的直流偏移。该方法还可以产生粗调校正值以调整初始化状态下的混频器电流，以及通信状态下的跟踪校正值。

2. 发明申请

US20070211765A1 Timing synchronization and channel estimation at a transition between local and wide area waveforms using a designated TDM pilot 有权
标题翻译：使用指定的TDM导频在本地和广域波形之间转换的定时同步和信道估计
公开(公告)号：US20070211765A1
公开(公告)日：2007-09-13
申请号：US11373607
申请日：2006-03-09
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Michael Wang
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Michael Wang
IPC分类号： H04J3/06
CPC分类号： H04L27/2613 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/0216 , H04L25/0226 , H04L25/03866 , H04L27/2662 , H04L27/2675
摘要： Systems and methods are provided for channel estimation and timing synchronization in a wireless network. In an embodiment, a method is provided for time synchronization at a wireless receiver. The method includes decoding at least one TDM pilot symbol located at a transition between wide and local waveforms and processing the TDM pilot symbol to perform time synchronization for a wireless receiver. Methods for channel estimation at a wireless receiver are also provided. This includes decoding at least one TDM pilot symbol and receiving the TDM pilot symbol from an OFDM broadcast to facilitate channel estimation for a wireless receiver.
摘要翻译：提供了系统和方法用于无线网络中的信道估计和定时同步。在一个实施例中，提供了一种用于在无线接收机处进行时间同步的方法。该方法包括解码位于宽和局部波形之间的转变处的至少一个TDM导频符号，并处理TDM导频符号以对无线接收机执行时间同步。还提供了在无线接收机处进行信道估计的方法。这包括解码至少一个TDM导频符号并从OFDM广播接收TDM导频符号以便于无线接收机的信道估计。

3. 发明申请

US20060250937A1 Method for transmission of time division multiplexed pilot symbols to aid channel estimation, time synchronization, and AGC bootstrapping in a multicast wireless system 有权
公开(公告)号：US20060250937A1
公开(公告)日：2006-11-09
申请号：US11372930
申请日：2006-03-09
申请人： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
发明人： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC分类号： H04J11/00
CPC分类号： H04L27/2613 , H04L5/0007 , H04L5/0048 , H04L25/023
摘要： Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.

4. 发明申请

US20060133388A1 Wide area and local network ID transmission for communication systems 有权
标题翻译：通信系统的广域和本地网络ID传输
公开(公告)号：US20060133388A1
公开(公告)日：2006-06-22
申请号：US11021310
申请日：2004-12-22
申请人： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
发明人： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
IPC分类号： H04L12/56
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/0083 , H04L27/261
摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.
摘要翻译：这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。导频可以被构造成单个OFDM符号和/或多个OFDM符号。用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。

5. 发明申请

US20070140385A1 Apparatus and methods for determining timing in a communication system 有权
标题翻译：用于确定通信系统中的定时的装置和方法
公开(公告)号：US20070140385A1
公开(公告)日：2007-06-21
申请号：US11303487
申请日：2005-12-15
申请人： Krishna Mukkavilli , Michael Wang , Raghuraman Krishnamoorthi
发明人： Krishna Mukkavilli , Michael Wang , Raghuraman Krishnamoorthi
IPC分类号： H04L27/06
CPC分类号： H04L27/2662 , H04L25/0202 , H04L27/2686
摘要： Apparatus and methods for use in a wireless communication system are disclosed for determining a timing position for channel activity in order to resolve timing ambiguity. A disclosed apparatus includes a processor that determines when channel activity occurs in at least one of an early or a late arrival position in a communication channel estimate and unwraps the channel activity in either the early arrival position or the late arrival position to a corresponding late or early arrival unwrapped channel activity position in the wireless channel estimate. The processor correlates symbol data in the communication signal corresponding to both the channel activity and the unwrapped channel activity to symbol data of the main channel activity. The processor determines whether a correct timing position of the channel activity is one of the early or late arrival positions based on the correlations, thus resolving timing ambiguity. Complementary methods are also disclosed.
摘要翻译：公开了用于无线通信系统中的装置和方法，用于确定信道活动的定时位置，以便解决定时模糊。所公开的装置包括处理器，其确定在通信信道估计中的早期或迟到到达位置中的至少一个中何时发生信道活动，并且将早期到达位置或延迟到达位置中的信道活动解包到相应的延迟或在无线信道估计中提前到达解开的频道活动位置。处理器将对应于信道活动和解开的信道活动的通信信号中的符号数据与主信道活动的符号数据相关联。处理器基于相关性确定信道活动的正确定时位置是早期还是迟到位置之一，从而解决定时模糊度。还公开了互补方法。

6. 发明申请

US20050163258A1 Time filtering for excess delay mitigation in OFDM systems 有权
标题翻译： OFDM系统中多余延迟缓解的时间滤波
公开(公告)号：US20050163258A1
公开(公告)日：2005-07-28
申请号：US11022513
申请日：2004-12-22
申请人： Dhananjay Gore , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli , Raghuraman Krishnamoorthi
发明人： Dhananjay Gore , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli , Raghuraman Krishnamoorthi
IPC分类号： H04L25/02 , H04L27/26 , H04B1/10
CPC分类号： H04L25/0224 , H04L25/0212 , H04L25/022
摘要： Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, time filtering is utilized. Time filtering is utilized to combat excess delay spread effects in channel estimation. The time filtering is performed in the presence of staggered pilots and helps in improving the channel estimate in the presence of excess delay spread.
摘要翻译：描述了具有超延迟扩展的OFDM系统的导频传输和信道估计技术。为了减轻多余延迟扩展的有害影响，利用时间滤波。利用时间滤波来对付信道估计中的多余延迟扩散效应。在存在交错导频的情况下执行时间滤波，并有助于在存在超延迟扩展的情况下改善信道估计。

7. 发明授权

US08443255B2 Parity check matrix optimization and selection for iterative decoding 失效
标题翻译：奇偶校验矩阵优化和迭代解码选择
公开(公告)号：US08443255B2
公开(公告)日：2013-05-14
申请号：US12869555
申请日：2010-08-26
申请人： Jing Jiang , Tao Tian , Raghuraman Krishnamoorthi , Xinmiao Zhang , Ashok Mantravadi , Krishna Mukkavilli
发明人： Jing Jiang , Tao Tian , Raghuraman Krishnamoorthi , Xinmiao Zhang , Ashok Mantravadi , Krishna Mukkavilli
IPC分类号： H03M13/00
CPC分类号： H03M13/1111 , H03M13/1191 , H03M13/1515 , H03M13/2966 , H03M13/616 , H04L1/005 , H04L1/0057
摘要： A method of generating a parity check matrix for iterative decoding of a linear block code includes: determining a set of parity check vectors for the linear block code; ordering according to Hamming weight non-zero parity check vectors of the set; selecting a criterion for generating the parity check matrix; and building the parity check matrix by incrementally selecting according to the criterion a parity check vector for each consecutive row of the parity check matrix, wherein the parity check vector is selected from the ordered non-zero parity check vectors remaining in the set.
摘要翻译：一种生成用于线性块码的迭代解码的奇偶校验矩阵的方法包括：确定用于线性块码的一组奇偶校验向量; 根据汉明重量非零奇偶校验向量进行排序; 选择用于生成奇偶校验矩阵的标准; 以及通过根据所述标准逐渐选择所述奇偶校验矩阵的每个连续行的奇偶校验向量来构建所述奇偶校验矩阵，其中所述奇偶校验向量是从所述组中剩余的有序非零奇偶校验向量中选择的。

8. 发明申请

US20080107192A1 Systems and Methods for Generalized Slot-to-Interlace Mapping 有权
标题翻译：广义插槽到交错映射的系统和方法
公开(公告)号：US20080107192A1
公开(公告)日：2008-05-08
申请号：US11834671
申请日：2007-08-06
申请人： Krishna Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
发明人： Krishna Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
IPC分类号： H04L27/28
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/0044 , H04L25/0224
摘要： A transmitter or receiver device includes a processing system configured to have one or more pilot interlace vectors and one or more distance vectors. The processing system is further configured to generate a first slot interlace for a first slot based on the one or more pilot interlace vectors, and is further configured to generate a second slot interlace for a second slot based on the first slot interlace and the one or more distance vectors. Additional slot interlaces for all other slots may also be generated based on the first slot interlace and the one or more distance vectors.
摘要翻译：发射机或接收机设备包括被配置为具有一个或多个导频交织向量和一个或多个距离向量的处理系统。所述处理系统还被配置为基于所述一个或多个导频交错向量来生成用于第一时隙的第一时隙交织，并且还被配置为基于所述第一时隙交织和所述第一时隙交织而生成用于第二时隙的第二时隙交织，更多距离矢量。也可以基于第一时隙交错和一个或多个距离矢量来生成用于所有其他时隙的附加时隙交织。

9. 发明申请

US20070070971A1 System and method for a forward link only physical layer 有权
标题翻译：仅用于前向链路物理层的系统和方法
公开(公告)号：US20070070971A1
公开(公告)日：2007-03-29
申请号：US11495480
申请日：2006-07-27
申请人： Fuyun Ling , Murali Chari , Rajiv Vijayan , Ashok Mantravadi , Alok Gupta , Krishna Mukkavilli , Michael Wang , Bojan Vrcelj , Bruce Collins
发明人： Fuyun Ling , Murali Chari , Rajiv Vijayan , Ashok Mantravadi , Alok Gupta , Krishna Mukkavilli , Michael Wang , Bojan Vrcelj , Bruce Collins
IPC分类号： H04J3/24 , H04L12/56
CPC分类号： H04L1/0002 , H04L1/0017 , H04L1/0041 , H04L1/0075 , H04L5/0007 , H04L5/0048 , H04L27/2613 , H04L27/2647 , H04L27/2662 , H04L69/32 , H04W48/08 , H04W72/005 , H04W80/00 , H04W88/02 , H04W92/10
摘要： Systems and methods are provided for processing forward link only (FLO) signals. A device receives a FLO signal, processes a TDM pilot comprising a TDM Pilot 1, a TDM Pilot 2, a WIC, a LIC, a Transition Pilot Channel, and a Positioning Pilot, from the FLO signal, processes an overhead information symbol (OIS) comprising a wide-area OIS and a local-area OIS, from the FLO signal, processes an FDM pilot comprising a wide-area FDM pilot and a local-area FDM pilot, from the FLO signal; and processes data comprising wide-area data and local-area data, from the FLO signal.
摘要翻译：提供系统和方法用于仅处理前向链路（FLO）信号。设备接收FLO信号，从FLO信号处理包括TDM导频1，TDM导频2，WIC，LIC，转换导频信道和定位导频的TDM导频，处理开销信息符号（OIS ）包括来自FLO信号的广域OIS和局域OIS，从FLO信号处理包括广域FDM导频和本地FDM导频的FDM导频; 并从FLO信号处理包括广域数据和局域数据的数据。

10. 发明申请

US20060111148A1 Low complexity beamformers for multiple transmit and receive antennas 失效
标题翻译：用于多个发射和接收天线的低复杂度波束形成器
公开(公告)号：US20060111148A1
公开(公告)日：2006-05-25
申请号：US10533248
申请日：2003-10-29
申请人： Krishna Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
发明人： Krishna Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
IPC分类号： H04B7/00
CPC分类号： H04B7/0639 , H01Q21/00 , H04B7/0443 , H04B7/0617 , H04B7/0669 , H04W52/42
摘要： Beamforming systems having a few bits of channel state information fed back to the transmitter benefit from low complexity decoding structures and performances gains compared with systems that do not have channel state feedback. Both unit rank and higher rank systems are implemented. Substantial design effort may be avoided by following a method of using functions formulated for space-time systems with the change that the channel coherence time is equated to the number of transmit antennas and the number of antennas in the space-time formulation is fixed at one.
摘要翻译：具有反馈到发射机的几比特信道状态信息的波束成形系统与没有信道状态反馈的系统相比，受益于低复杂性解码结构和性能增益。实现了单位级和高级制。通过遵循使用为空时系统制定的功能的方法可以避免大量的设计努力，其中信道相干时间等于发射天线的数量，并且时空公式中的天线数量固定在一个。

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