-
公开(公告)号：US20070069952A1
公开(公告)日：2007-03-29
申请号：US11326868
申请日：2006-01-05
Applicant: Fuyun Ling , Gordon Walker , Krishna Mukkavilli
Inventor： Fuyun Ling , Gordon Walker , Krishna Mukkavilli
CPC classification number: G01S5/021 , G01S1/024 , G01S5/0226 , G01S5/14 , H04W64/00
Abstract: Systems and methods are provided for determining position location information in a wireless network. In one embodiment, timing offset information is communicated between multiple transmitters and one or more receivers. Such information enables accurate position or location determinations to be made that account for timing differences throughout the network. In another embodiment, transmitter phase adjustments are made that advance or delay transmissions from the transmitters to account for potential timing differences at receivers. In yet another embodiment, combinations of timing offset communications and/or transmitter phase adjustments can be employed in the wireless network to facilitate position location determinations.
Abstract translation: 提供了用于确定无线网络中的位置信息的系统和方法。 在一个实施例中，在多个发射机和一个或多个接收机之间传送定时偏移信息。 这样的信息使得可以进行精确的位置或位置确定，从而考虑整个网络的时序差异。 在另一个实施例中，进行发射机相位调整，其推进或延迟来自发射机的传输以考虑接收机处的潜在时序差异。 在另一个实施例中，可以在无线网络中采用定时偏移通信和/或发射机相位调整的组合以便于位置定位确定。
-
公开(公告)号：US20060250937A1
公开(公告)日：2006-11-09
申请号：US11372930
申请日：2006-03-09
Applicant: Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
Inventor： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC: H04J11/00
CPC classification number: H04L27/2613 , H04L5/0007 , H04L5/0048 , H04L25/023
Abstract: 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.
-
公开(公告)号：US20060227910A1
公开(公告)日：2006-10-12
申请号：US11373611
申请日：2006-03-09
IPC: H03D1/04
Abstract: 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.
Abstract translation: 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。
-
4.发明申请Timing corrections in a multi carrier system and propagation to a channel estimation time filter 有权多载波系统中的定时校正和传播到信道估计时间滤波器公开(公告)号：US20060227812A1
公开(公告)日：2006-10-12
申请号：US11373764
申请日：2006-03-09
Applicant: Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli
Inventor： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli
IPC: H04J3/06
CPC classification number: H04L25/0232 , H04L25/0212 , H04L25/0224 , H04L25/025 , H04L27/2662 , H04L27/2665
Abstract: Systems and methods are provided for determining and applying timing corrections in a digital communications system. In an aspect, a timing correction method is provided for a multi-carrier system. This includes aligning two or more symbols with respect to each other from a symbol subset in order to account for timing differences between the symbols. The symbol alignment is first carried out to generate channel estimates for data demodulation. The channel estimates, thus generated, along with the timing alignment information are in turn used for determining timing corrections to be applied to future symbols.
Abstract translation: 提供了用于在数字通信系统中确定和应用定时校正的系统和方法。 在一方面，为多载波系统提供定时校正方法。 这包括从符号子集彼此对准两个或更多个符号，以便考虑符号之间的时序差异。 首先执行符号对齐以产生用于数据解调的信道估计。 由此生成的信道估计与定时对准信息一起被用于确定要应用于未来符号的定时校正。
-
公开(公告)号：US20070072621A1
公开(公告)日：2007-03-29
申请号：US11327536
申请日：2006-01-05
Applicant: Krishna Mukkavilli , Fuyun Ling , Gordon Walker
Inventor： Krishna Mukkavilli , Fuyun Ling , Gordon Walker
IPC: H04Q7/20
CPC classification number: H04L27/2655 , G01S5/021 , G01S5/0226 , G01S5/14 , H04L27/2607 , H04L27/2646 , H04W64/00
Abstract: Systems and methods are provided for determining position location information in a wireless network. In one embodiment, timing offset information is communicated between multiple transmitters and one or more receivers. Such information enables accurate position or location determinations to be made that account for timing differences throughout the network. In another embodiment, transmitter phase adjustments are made that advance or delay transmissions from the transmitters to account for potential timing differences at receivers. In yet another embodiment, combinations of timing offset communications and/or transmitter phase adjustments can be employed in the wireless network to facilitate position location determinations.
Abstract translation: 提供了用于确定无线网络中的位置信息的系统和方法。 在一个实施例中，在多个发射机和一个或多个接收机之间传送定时偏移信息。 这样的信息使得可以进行精确的位置或位置确定，从而考虑整个网络的时序差异。 在另一个实施例中，进行发射机相位调整，其推进或延迟来自发射机的传输以考虑接收机处的潜在时序差异。 在另一个实施例中，可以在无线网络中采用定时偏移通信和/或发射机相位调整的组合以便于位置定位确定。
-
Patent Agency Ranking
6.发明申请公开(公告)号：US20070069953A1
公开(公告)日：2007-03-29
申请号：US11327535
申请日：2006-01-05
Applicant: Fuyun Ling , Gordon Walker , Krishna Mukkavilli
Inventor： Fuyun Ling , Gordon Walker , Krishna Mukkavilli
CPC classification number: G01S5/021 , G01S5/0226 , G01S5/10 , G01S5/14
Abstract: Systems and methods are provided for determining position location information in a wireless network. In one embodiment, timing offset information is communicated between multiple transmitters and one or more receivers. Such information enables accurate position or location determinations to be made that account for timing differences throughout the network. In another embodiment, transmitter phase adjustments are made that advance or delay transmissions from the transmitters to account for potential timing differences at receivers. In yet another embodiment, combinations of timing offset communications and/or transmitter phase adjustments can be employed in the wireless network to facilitate position location determinations.
Abstract translation: 提供了用于确定无线网络中的位置信息的系统和方法。 在一个实施例中，在多个发射机和一个或多个接收机之间传送定时偏移信息。 这样的信息使得可以进行精确的位置或位置确定，从而考虑整个网络的时序差异。 在另一个实施例中，进行发射机相位调整，其推进或延迟来自发射机的传输以考虑接收机处的潜在时序差异。 在另一个实施例中，可以在无线网络中采用定时偏移通信和/或发射机相位调整的组合以便于位置定位确定。
-
公开(公告)号：US20060133388A1
公开(公告)日：2006-06-22
申请号：US11021310
申请日：2004-12-22
Applicant: Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
Inventor： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
IPC: H04L12/56
CPC classification number: H04L5/0048 , H04L5/0007 , H04L5/0083 , H04L27/261
Abstract: 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.
Abstract translation: 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。
-
8.发明申请Generalized m-rank beamformers for mimo systems using successive quantization 有权使用连续量化的mimo系统的广义m阶波束形成器公开(公告)号：US20060039493A1
公开(公告)日：2006-02-23
申请号：US10923056
申请日：2004-08-19
Applicant: Krishna Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
Inventor： Krishna Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
CPC classification number: H04B7/0417 , H04B7/043 , H04B7/0443 , H04B7/0634 , H04B7/0639 , H04B7/0663
Abstract: The telecommunications system described herein implements a multi-rank beamformer for use in wireless systems equipped with multiple transmit and multiple receive antennas. The multi-rank beamformer uses finite-rate feedback of channel conditions to achieves close to theoretical performance indicated by the water-filling algorithm, while avoiding the computational complexity associated with space time codes. In addition, the multi-rank beamforming system described herein improves on the performance of unit rank beamforming methods by maintaining the gains over space time codes over a broader range of transmission rates.
Abstract translation: 本文描述的电信系统实现用于配备有多个发射和多个接收天线的无线系统中的多等级波束形成器。 多级波束形成器使用信道条件的有限速率反馈来实现接近灌水算法所指示的理论性能，同时避免与时空码相关的计算复杂度。 另外，本文描述的多级波束成形系统通过在更宽的传输速率范围内保持空间时间码的增益来改善单位秩波束成形方法的性能。
-
公开(公告)号：US20050249181A1
公开(公告)日：2005-11-10
申请号：US10926884
申请日：2004-08-25
Applicant: Rajiv Vijayan , Ashok Mantravadi , Krishna Mukkavilli
Inventor： Rajiv Vijayan , Ashok Mantravadi , Krishna Mukkavilli
CPC classification number: H04L25/022 , H04L5/0048 , H04L23/02 , H04L25/0212 , H04L25/0228 , H04L27/2662 , H04L27/2695
Abstract: To allow a receiving entity to derive a longer channel estimate while limiting overhead, a transmitting entity transmits a pilot on different groups of subbands in different time intervals. N subbands in the system are arranged into M non-overlapping groups. Each group includes P=N/M subbands that are uniformly distributed across the N subbands. The transmitting entity transmits the pilot on a different subband group in each time interval, and selects all M subband groups in M time intervals based on a pilot staggering pattern. The receiving entity derives (1) an initial impulse response estimate with P channel taps based on the pilot received on one subband group and (2) two longer impulse response estimates with different lengths used for data detection and time tracking. Each longer impulse response estimate may be derived by filtering initial impulse response estimates for a sufficient number of subband groups using a time-domain filter.
Abstract translation: 为了允许接收实体在限制开销的同时导出更长的信道估计，发送实体以不同的时间间隔在不同的子带组上发送导频。 系统中的N个子带被布置成M个非重叠组。 每组包括均匀分布在N个子带上的P = N / M个子带。 发送实体在每个时间间隔中在不同子带组上发送导频，并且基于导频交错模式以M个时间间隔选择所有M个子带组。 接收实体基于在一个子带组上接收到的导频导出（1）具有P个信道抽头的初始脉冲响应估计，以及（2）用于数据检测和时间跟踪的两个具有不同长度的较长脉冲响应估计。 可以通过使用时域滤波器对足够数量的子带组的初始脉冲响应估计进行滤波来导出更长的脉冲响应估计。
-
10.发明申请Timing synchronization and channel estimation at a transition between local and wide area waveforms using a designated TDM pilot 有权使用指定的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
Applicant: Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Michael Wang
Inventor： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Michael Wang
IPC: H04J3/06
CPC classification number: H04L27/2613 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/0216 , H04L25/0226 , H04L25/03866 , H04L27/2662 , H04L27/2675
Abstract: 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.
Abstract translation: 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。
-
-
-
-
-
-
-
-
-
Search Results
19
records
(took 0.015 seconds)
