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19 条记录 (耗时 0.017 秒)

    Receiver DC offset correction
    1.
    发明申请
    Receiver DC offset correction 审中-公开
    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。

    Wide area and local network ID transmission for communication systems
    4.
    发明申请
    Wide area and local network ID transmission for communication systems 有权
    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。

    Apparatus and methods for determining timing in a communication system
    5.
    发明申请
    Apparatus and methods for determining timing in a communication system 有权
    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。

    Systems and Methods for Generalized Slot-to-Interlace Mapping
    8.
    发明申请
    Systems and Methods for Generalized Slot-to-Interlace Mapping 有权
    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。

    Low complexity beamformers for multiple transmit and receive antennas
    10.
    发明申请
    Low complexity beamformers for multiple transmit and receive antennas 失效
    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 。