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    Frequency domain filtering to improve channel estimation in multicarrier systems
    1.
    发明授权
    Frequency domain filtering to improve channel estimation in multicarrier systems 失效
    频域滤波以改善多载波系统中的信道估计

    公开(公告)号：US07616711B2

    公开(公告)日：2009-11-10

    申请号：US11022360

    申请日：2004-12-22

    申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar ,  Alexei Gorokhov

    发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar ,  Alexei Gorokhov

    IPC分类号： H03D1/00 ,  H04L27/06

    CPC分类号： H04L27/2647 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/006 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/023

    摘要： A channel estimation system comprises a filtering component that selectively scales a plurality of carriers as a function of location of the plurality of carriers within a frequency band, wherein the plurality of carriers comprises at least one data carrier and at least one pilot carrier. A component thereafter extrapolates an observation from the at least one pilot carrier, wherein a channel is estimated as a function of the extrapolated observation. The scaling of the carriers facilitates reducing a flooring effect associated with channel estimation. The filtering component can be employed at a transmitter and/or at a receiver, and can be activated and/or deactivated as a function of a sensed data packet type.

    摘要翻译： 信道估计系统包括：滤波部件，其选择性地按照频带内的多个载波的位置来缩放多个载波，其中所述多个载波包括至少一个数据载波和至少一个导频载波。 然后，组件从至少一个导频载波外推观测，其中，估计信道作为外推观测的函数。 载波的缩放有助于减少与信道估计相关的地板效应。 滤波组件可以在发射机和/或接收机处采用，并且可以作为感测数据分组类型的功能被激活和/或去激活。

    Unified pulse shaping for multi-carrier and single-carrier waveforms
    3.
    发明授权
    Unified pulse shaping for multi-carrier and single-carrier waveforms 有权
    统一的脉冲整形用于多载波和单载波波形

    公开(公告)号：US08484272B2

    公开(公告)日：2013-07-09

    申请号：US11022537

    申请日：2004-12-22

    申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    IPC分类号： G06F17/14

    CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0044 ,  H04L25/03834 ,  H04L27/0008 ,  H04L27/2607 ,  H04L27/2626 ,  H04L27/2647

    摘要： To transmit a multi-carrier signal, a transmitter provides zero symbols for guard subbands, performs OFDM modulation, and filters the resultant time-domain samples with a pulse shaping filter. To transmit a single-carrier signal, the transmitter partitions the single-carrier signal into segments. Each segment contains up to K samples and is padded, if needed, to the length of an OFDM symbol. Each padded segment is transformed from the time domain to the frequency domain to generate a corresponding frequency-domain segment with K symbols. For each frequency-domain segment, the symbols corresponding to the guard subbands are set to zero. Each frequency-domain segment is then transformed from the frequency domain to the time domain to generate a corresponding time-domain segment. A cyclic prefix may or may not be appended to each time-domain segment. Each time-domain segment is filtered with the same pulse shaping filter to generate an output waveform for the single-carrier signal.

    摘要翻译： 为了发送多载波信号，发射机为保护子带提供零符号，执行OFDM调制，并用脉冲整形滤波器对合成的时域采样进行滤波。 为了发送单载波信号，发射机将单载波信号分割成段。 每个段包含多达K个样本，并且如果需要，则填充到OFDM符号的长度。 每个填充段从时域变换到频域，以产生具有K个符号的对应的频域段。 对于每个频域段，对应于保护子带的符号被设置为零。 然后将每个频域段从频域变换到时域以产生对应的时域段。 循环前缀可以附加到每个时域段，也可以不附加到每个时域段。 每个时域分段用相同的脉冲整形滤波器滤波，以产生单载波信号的输出波形。

    Incremental pilot insertion for channnel and interference estimation
    4.
    发明授权
    Incremental pilot insertion for channnel and interference estimation 有权
    增量导频插入用于信道和干扰估计

    公开(公告)号：US08085875B2

    公开(公告)日：2011-12-27

    申请号：US11128976

    申请日：2005-05-13

    申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    IPC分类号： H04L27/00

    CPC分类号： H04L25/0226 ,  H04L5/0007 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/006

    摘要： Dynamic resource allocation systems, apparatus, and methods are disclosed for selectively improving the ability of a receiver to determine a channel estimate in an Orthogonal Frequency Division Multiple Access (OFDMA) system. A wireless communication system can use a common pilot channel configuration to aid channel estimation in one or more receivers in communication with the system. A receiver in communication with the system may be unable to demodulate received data due to an inaccurate channel estimate. The receiver can communicate to a transmitter in the system a request for additional channel estimation resources. The wireless communication system can provide additional channel estimation resources by inserting dedicated pilot channels into one or more of the frequencies allocated to symbols for the receiver. If the receiver is still unable to demodulate received data, the wireless communication system can incrementally insert additional pilot channels in the symbol associated with the receiver.

    摘要翻译： 公开了动态资源分配系统，装置和方法，用于选择性地提高接收机在正交频分多址（OFDMA）系统中确定信道估计的能力。 无线通信系统可以使用公共导频信道配置来辅助与系统通信的一个或多个接收机中的信道估计。 与系统通信的接收机可能由于不准确的信道估计而无法解调所接收的数据。 接收机可以向系统中的发射机通信另外的信道估计资源的请求。 无线通信系统可以通过将专用导频信道插入分配给接收机的符号的一个或多个频率来提供额外的信道估计资源。 如果接收机仍然不能解调所接收的数据，则无线通信系统可以递增地在与接收机相关联的符号中插入附加的导频信道。

    SDMA for WCDMA
    5.
    发明授权
    SDMA for WCDMA 有权
    SDMA用于WCDMA

    公开(公告)号：US08064424B2

    公开(公告)日：2011-11-22

    申请号：US11213463

    申请日：2005-08-26

    申请人： Sharad Deepak Sambhwani ,  Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Arak Sutivong ,  Alexei Gorokhov

    发明人： Sharad Deepak Sambhwani ,  Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Arak Sutivong ,  Alexei Gorokhov

    IPC分类号： H04B7/216

    CPC分类号： H04J13/0048 ,  H04J13/18

    摘要： Systems and methodologies are described that facilitate increasing system capacity in a code-limited WCDMA (e.g., TDD, FDD, . . . ) wireless communication environment. According to one aspect, a larger code space can be defined by introducing multiple code clusters within a sector, wherein each cluster has a unique scrambling code. Codes within a cluster can have orthogonal Walsh sequences that can be assigned to user devices to facilitate communicating over a wireless network and can overlap with codes in another cluster. The unique scrambling code assigned to each cluster can ensure that duplicate Walsh sequences in another cluster in the same sector appear as a pseudo-noise codes.

    摘要翻译： 描述了在有限的WCDMA（例如，TDD，FDD，...）无线通信环境中增加系统容量的系统和方法。 根据一个方面，可以通过在扇区内引入多个码集来定义更大的码空间，其中每个群集具有唯一的扰码。 群集内的代码可以具有可被分配给用户设备的正交沃尔什序列，以便于通过无线网络进行通信并且可以与另一个群集中的代码重叠。 分配给每个簇的唯一扰码可以确保同一扇区中另一个簇中的重复沃尔什序列显示为伪噪声码。

    SDMA resource management
    6.
    发明授权
    SDMA resource management 有权
    SDMA资源管理

    公开(公告)号：US08693405B2

    公开(公告)日：2014-04-08

    申请号：US11261837

    申请日：2005-10-27

    申请人： Tingfang Ji ,  Dhananjay Ashok Gore ,  Alexei Gorokhov ,  Min Dong ,  Avneesh Agrawal

    发明人： Tingfang Ji ,  Dhananjay Ashok Gore ,  Alexei Gorokhov ,  Min Dong ,  Avneesh Agrawal

    IPC分类号： H04B7/00

    CPC分类号： H04W72/06 ,  H04B1/713 ,  H04B7/026 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0044 ,  H04L5/023

    摘要： A method for allocating resources in a wireless communications environment comprises receiving a mapping between a first hop-port and frequency range, and determining whether to map a second access terminal to a second hop-port that is mapped to at least the same frequency range during a substantially similar instance in time, the determination made as a function of characteristics relating to a first access terminal associated with the first hop-port. The method can further include determining that the first access terminal is a candidate for employing Space-Division Multiple Access (SDMA), and mapping the second-hop port and associating the second access terminal with the second hop-port when the second access terminal is also a candidate for employing SDMA.

    摘要翻译： 一种用于在无线通信环境中分配资源的方法包括：接收第一跳跃端口和频率范围之间的映射，以及确定是否将第二接入终端映射到映射到至少相同频率范围的第二跳频端口 基本相似的时间实例，根据与与第一跳跃端口相关联的第一接入终端的特性的函数进行确定。 该方法还可以包括确定第一接入终端是采用空分多址（SDMA）的候选者，并且当第二接入终端是第二接入终端时，映射第二跳接口并将第二接入终端与第二跳接口相关联 也是采用SDMA的候选人。

    Iterative channel and interference estimation with dedicated pilot tones for OFDMA
    7.
    发明授权
    Iterative channel and interference estimation with dedicated pilot tones for OFDMA 有权
    用于OFDMA的专用导频音的迭代信道和干扰估计

    公开(公告)号：US07830976B2

    公开(公告)日：2010-11-09

    申请号：US11182235

    申请日：2005-07-15

    申请人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Ashok Gore ,  Arvind Vijay Keerthi

    发明人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Ashok Gore ,  Arvind Vijay Keerthi

    IPC分类号： H04B7/02

    CPC分类号： H04L25/0236 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/023 ,  H04L25/0248 ,  H04L27/2647

    摘要： Estimation of channel characteristics and interference level in a time-varying multi-carrier multi-user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. Next, an initial estimate value is selected for the interference level. The initial estimate value for the interference level is used together with the received pilot symbols to provide a first estimate of the channel. The first estimate of the channel is used to determine a new updated value for the interference level, which in turn, is used to update the value of the first estimate of the channel iteratively. The iterations continue until the iteratively updated values of the interference level and channel satisfy predefined limits. The data symbols and the final updated value of the channel are subsequently used to provide a second estimate for the channel.

    摘要翻译： 并行执行时变多载波多用户系统中的信道特性和干扰电平的估计。 为了执行估计，通过信道发送多个数据符号和专用导频符号。 接下来，针对干扰电平选择初始估计值。 干扰电平的初始估计值与接收到的导频符号一起使用以提供信道的第一估计。 信道的第一估计用于确定用于干扰电平的新的更新值，其又用于迭代地更新信道的第一估计值。 迭代继续，直到干扰电平和通道的迭代更新值满足预定义的限制。 随后使用数据符号和信道的最终更新值来提供信道的第二估计。

    Beacon-based control channels
    9.
    发明授权
    Beacon-based control channels 有权
    基于信标的控制通道

    公开(公告)号：US08798665B2

    公开(公告)日：2014-08-05

    申请号：US12163812

    申请日：2008-06-27

    申请人： Ravi Palanki ,  Avneesh Agrawal ,  Alexei Gorokhov ,  Aamod Khandekar ,  Ashwin Sampath ,  Dexu Lin

    发明人： Ravi Palanki ,  Avneesh Agrawal ,  Alexei Gorokhov ,  Aamod Khandekar ,  Ashwin Sampath ,  Dexu Lin

    IPC分类号： H04W48/12

    CPC分类号： H04L5/0053 ,  H04L1/0056 ,  H04L1/0072 ,  H04L5/0096 ,  H04L27/10 ,  H04W4/20

    摘要： Systems and methodologies are described that facilitate transmitting control information in wireless networks. Portions of bandwidth can be blanked for transmitting control information, and the control information transmitters can utilize beacon symbols to convey the control information. In this regard, interference is mitigated with respect to data transmissions over the control information bandwidth. Selected frequencies of the beacon symbols in a codeword can be used to indicate the control information. The codewords can be encoded with an error control code to provide redundancy for decoding in the presence of some interference.

    摘要翻译： 描述了有助于在无线网络中发送控制信息的系统和方法。 可以将部分带宽消隐以发送控制信息，并且控制信息发射机可以利用信标符号来传达控制信息。 在这方面，相对于控制信息带宽上的数据传输，减轻了干扰。 可以使用码字中的信标符号的选定频率来指示控制信息。 可以用错误控制码对码字进行编码，以在存在一些干扰的情况下提供用于解码的冗余。