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315 条记录 (耗时 0.036 秒)

    Varied transmission time intervals for wireless communication system
    131.
    发明申请
    Varied transmission time intervals for wireless communication system 有权
    无线通信系统的传输时间间隔

    公开(公告)号：US20070047485A1

    公开(公告)日：2007-03-01

    申请号：US11260932

    申请日：2005-10-27

    申请人： Alexei Gorokhov ,  Edward Teague ,  Aamod Khandekar

    发明人： Alexei Gorokhov ,  Edward Teague ,  Aamod Khandekar

    IPC分类号： H04Q7/00

    CPC分类号： H04W72/1231

    摘要： Embodiments describe a varied transmission time interval in wireless communication system. According to some embodiments is a method for assigning a transmission time interval. The method can include measuring a channel condition and/or a data rate of packet communicated by at least one wireless device. Based in part on the data rate and/or channel condition information, a determination can be made whether to schedule a long transmission time interval or a short transmission time interval to the packet. A long transmission time interval can be scheduled if the channel condition is poor and/or there is a low data rate. A short transmission time interval can be scheduled if the channel condition is good and/or the data rate is high or fast. The method can be repeated for multiple wireless devices. Also included is an alternative interlacing structure that supports both long transmission time intervals and short transmission time intervals.

    摘要翻译： 实施例描述了无线通信系统中的变化的传输时间间隔。 根据一些实施例是用于分配传输时间间隔的方法。 该方法可以包括测量由至少一个无线设备传送的分组的信道条件和/或数据速率。 部分地基于数据速率和/或信道条件信息，可以确定是否为分组规划长的传输时间间隔或短的传输时间间隔。 如果信道条件差和/或数据速率低，则可以调度长传输时间间隔。 如果信道条件良好和/或数据速率高或快，则可以调度短传输时间间隔。 可以为多个无线设备重复该方法。 还包括支持长传输时间间隔和短传输时间间隔的替代交错结构。

    Multi-sector broadcast paging channel
    134.
    发明授权
    Multi-sector broadcast paging channel 失效
    多扇区广播寻呼信道

    公开(公告)号：US08543138B2

    公开(公告)日：2013-09-24

    申请号：US11175788

    申请日：2005-07-05

    申请人： Edward Harrison Teauge ,  Avneesh Agrawal ,  Aamod Khandekar

    发明人： Edward Harrison Teauge ,  Avneesh Agrawal ,  Aamod Khandekar

    IPC分类号： H04W68/00

    CPC分类号： H04B7/0491 ,  H04W16/24 ,  H04W68/10

    摘要： Systems and methods are described that facilitate improving paging signal strength at or near sector perimeters in a wireless network region by transmitted identical paging waveforms simultaneously from all sectors in the region and permitting over-the-air signal aggregation to combine signal energy near sector perimeters. Waveforms can be modulated using an orthogonal frequency division multiplexing technique and can be simultaneously transmitted according to predefined transmission resources over a multi-sector broadcast paging channel reserved for such identical waveforms. Cyclic prefix can be added to the identical waveforms to mitigate problems associated with delay spread and/or time-of-arrival differences at or near sector perimeters.

    摘要翻译： 描述了系统和方法，其有助于通过从该区域中的所有扇区同时发送的相同寻呼波形来改善无线网络区域中或其附近的寻呼信号强度，并允许空中信号聚合以组合扇区周边附近的信号能量。 可以使用正交频分复用技术来调制波形，并且可以通过为这样相同的波形保留的多扇区广播寻呼信道根据预定义的传输资源同时发送波形。 循环前缀可以添加到相同的波形中，以减轻与扇区边缘处或附近的延迟扩展和/或到达时间差异相关的问题。

    Iterative channel and interference estimation and decoding
    135.
    发明授权
    Iterative channel and interference estimation and decoding 有权
    迭代通道和干扰估计与解码

    公开(公告)号：US07421041B2

    公开(公告)日：2008-09-02

    申请号：US10791342

    申请日：2004-03-01

    申请人： Aamod Khandekar ,  Avneesh Agrawal ,  Fuyun Ling

    发明人： Aamod Khandekar ,  Avneesh Agrawal ,  Fuyun Ling

    IPC分类号： H03K9/00

    CPC分类号： H04L1/005 ,  H04L1/0071 ,  H04L25/0238 ,  H04L25/03171

    摘要： For an iterative channel and interference estimation and decoding scheme, prior information for channel gain and interference is initially obtained based on received pilot symbols. Forward information for code bits corresponding to received data symbols is derived based on the received data symbols and the prior information and then decoded to obtain feedback information for the code bits corresponding to the received data symbols. A posteriori information for channel gain and interference for each received data symbol is derived based on the feedback information for that received data symbol. The a posteriori information for the received data symbols and the prior information are combined to obtain updated information for channel gain and interference for each received data symbol. The process can be repeated for any number of iterations. The prior, a posteriori, and updated information may be represented by joint probability distributions on channel gain and interference. The forward and feedback information may be represented by log-likelihood ratios.

    摘要翻译： 对于迭代信道和干扰估计和解码方案，首先基于接收到的导频符号获得用于信道增益和干扰的先验信息。 基于接收到的数据符号和先验信息导出与接收到的数据符号相对应的码位的转发信息，然后解码以获得与接收的数据符号对应的码位的反馈信息。 基于该接收到的数据符号的反馈信息导出每个接收到的数据符号的信道增益和干扰的后验信息。 组合接收到的数据符号和先验信息的后验信息以获得每个接收到的数据符号的信道增益和干扰的更新信息。 该过程可以重复任意次数的迭代。 先前的，后验的和更新的信息可以由通道增益和干扰的联合概率分布来表示。 正向和反馈信息可以由对数似然比表示。

    Unified pulse shaping for multi-carrier and single-carrier waveforms
    136.
    发明申请
    Unified pulse shaping for multi-carrier and single-carrier waveforms 有权

    公开(公告)号：US20060039273A1

    公开(公告)日：2006-02-23

    申请号：US11022537

    申请日：2004-12-22

    申请人： Dhananjay Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    发明人： Dhananjay Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    IPC分类号： H04J11/00

    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.

    Rate prediction in fractional reuse systems
    137.
    发明申请
    Rate prediction in fractional reuse systems 有权
    分数复用系统中的速率预测

    公开(公告)号：US20060014542A1

    公开(公告)日：2006-01-19

    申请号：US11168904

    申请日：2005-06-28

    申请人： Aamod Khandekar ,  Avneesh Agrawal

    发明人： Aamod Khandekar ,  Avneesh Agrawal

    IPC分类号： H04Q7/20

    CPC分类号： H04L1/0015 ,  H04L1/0002 ,  H04L1/0006 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/1812 ,  H04L1/20 ,  H04L5/0007 ,  H04L5/0012 ,  H04L5/006 ,  H04L27/2601 ,  H04W16/02 ,  H04W16/12

    摘要： Apparatus and methods for rate prediction in a wireless communication system having fractional frequency reuse are disclosed. A wireless communication system implementing Orthogonal Frequency Division Multiple Access (OFDMA) can implement a fractional frequency reuse plan where a portion of carriers is allocated for terminals not anticipating handoff and another portion of the carriers is reserved for terminals having a higher probability of handoff. Each of the portions can define a reuse set. The terminals can be constrained to frequency hop within a reuse set. The terminal can also be configured to determine a reuse set based on a present assignment of a subset of carriers. The terminal can determine a channel estimate and a channel quality indicator based in part on at least the present reuse set. The terminal can report the channel quality indicator to a source, which can determine a rate based on the index value.

    摘要翻译： 公开了具有分数次频率重用的无线通信系统中的速率预测装置和方法。 实现正交频分多址（OFDMA）的无线通信系统可以实现分数频率复用计划，其中一部分载波被分配给不预期切换的终端，另一部分载波被保留用于具有较高切换概率的终端。 每个部分可以定义重用集合。 终端可以被限制在重用集合内的跳频。 终端还可以被配置为基于载波子集的当前分配来确定重用集合。 所述终端可以部分地至少基于所述重用集合来确定信道估计和信道质量指示符。 终端可以将信道质量指示符报告给源，可以根据索引值确定速率。

    Incremental pilot insertion for channnel and interference estimation
    138.
    发明申请
    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：US20060013338A1

    公开(公告)日：2006-01-19

    申请号：US11128976

    申请日：2005-05-13

    申请人： Dhananjay Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    发明人： Dhananjay Gore ,  Avneesh Agrawal ,  Aamod Khandekar

    IPC分类号： H04L27/16

    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帮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。