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    Method and apparatus for providing random access detection in a communication system
    2.
    发明申请
    Method and apparatus for providing random access detection in a communication system 有权
    在通信系统中提供随机存取检测的方法和装置

    公开(公告)号：US20050117675A1

    公开(公告)日：2005-06-02

    申请号：US10725095

    申请日：2003-12-01

    申请人： Deepak Das ,  Jung Lee ,  Shirish Nagaraj ,  Anil Rao

    发明人： Deepak Das ,  Jung Lee ,  Shirish Nagaraj ,  Anil Rao

    IPC分类号： H03D1/00 ,  H04B7/08

    CPC分类号： H04B7/086

    摘要： The disclosed embodiments relate to a communication system and method. The system may comprise a pre-whitening device that applies pre-whitening data to a received signal from an antenna array to produce a pre-whitened signal, at least one detector that is adapted to recognize a pattern corresponding to a request for access in the pre-whitened signal and compute correlation data corresponding to the pattern, and a threshold detector that determines whether the correlation data exceeds a threshold and indicates that an acknowledgement signal should be transmitted if the threshold is exceeded. The method may comprise the acts of creating a pre-whitened signal by applying pre-whitening data to a received signal, detecting a pattern that corresponds to a request for access in the pre-whitened signal, computing correlation data corresponding to the pattern, determining whether the correlation data exceeds a threshold, and indicating that an acknowledgement signal should be transmitted if the threshold is exceeded.

    摘要翻译： 所公开的实施例涉及通信系统和方法。 所述系统可以包括预白化装置，其将来自天线阵列的接收信号的预白化数据应用于产生预白化信号;至少一个检测器，适于识别与所述接收信号的请求相对应的模式 预白化信号和计算与图案对应的相关数据;以及阈值检测器，其确定相关数据是否超过阈值，并指示如果超过阈值则应发送确认信号。 该方法可以包括通过对接收到的信号应用预白化数据来产生预白化信号的动作，检测对应于预白化信号中的访问请求的模式，计算对应于模式的相关数据，确定 相关数据是否超过阈值，并指示如果超过阈值，则应发送确认信号。

    Method of determining random access channel preamble detection performance in a communication system
    4.
    发明申请
    Method of determining random access channel preamble detection performance in a communication system 有权
    在通信系统中确定随机接入信道前导码检测性能的方法

    公开(公告)号：US20050047347A1

    公开(公告)日：2005-03-03

    申请号：US10649797

    申请日：2003-08-28

    申请人： Jung Lee ,  Shirish Nagaraj

    发明人： Jung Lee ,  Shirish Nagaraj

    IPC分类号： H04L1/20 ,  H04L1/00

    CPC分类号： H04L1/20

    摘要： In a method for determining link level performance of random access channel (RACH) preamble detection in a wireless communication system, link level performance results may be obtained without having to perform extensive simulation. Link-level performance results of RACH preamble detection may be characterized by determining a conditional detection probability. The conditional detection probability may be conditioned upon an instantaneous channel coefficient, and the conditional detection probability may be expressed in terms of an instantaneous detection metric. Instantaneous link-level performance may be characterized using a look-up table, so that a system model evaluated in accordance with the method may accurately represent instantaneous system behavior.

    摘要翻译： 在无线通信系统中用于确定随机接入信道（RACH）前同步码检测的链路级性能的方法中，可以获得链路级性能结果而无需执行广泛的仿真。 可以通过确定条件检测概率来表征RACH前导码检测的链路级性能结果。 条件检测概率可以基于瞬时信道系数来调节，并且条件检测概率可以用瞬时检测度量表示。 可以使用查找表来表征瞬时链路级性能，使得根据该方法评估的系统模型可以准确地表示瞬时系统行为。

    Frequency Error Correction for LTE Uplink CoMP
    5.
    发明申请
    Frequency Error Correction for LTE Uplink CoMP 有权
    LTE上行链路协议的频率纠错

    公开(公告)号：US20150282171A1

    公开(公告)日：2015-10-01

    申请号：US14430699

    申请日：2012-09-24

    申请人： Shirish NAGARAJ ,  Xiaoyong YU ,  NOKIA SIEMENS NETWORKS OY

    发明人： Xiaoyong Yu ,  Shirish Nagaraj

    IPC分类号： H04W72/04 ,  H04L5/00 ,  H04L25/02 ,  H04L27/26 ,  H04L25/03

    CPC分类号： H04W72/0453 ,  H04B7/0857 ,  H04L5/0005 ,  H04L5/0035 ,  H04L25/0204 ,  H04L25/0206 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/03159 ,  H04L27/0014 ,  H04L27/2657 ,  H04L27/266 ,  H04L2027/0067

    摘要： A method includes, for a selected user equipment for signals corresponding in part to the selected user equipment and received by antennas from a number of cells, wherein each cell has one or more antennas, and wherein each signal is from an individual one of the antennas, performing the following: estimating carrier frequency offset for each cell using one or more of the signals from the cell; performing frequency offset correction on each signal from each cell by using at least the estimated carrier frequency offset for an associated cell; estimating a channel for each frequency offset corrected signal; and combining, using the estimated channels, each of the frequency offset corrected signals to generate one or more estimates of one or more symbols transmitted from the selected user equipment. A second frequency offset correction may be performed subsequent to the combining. Apparatus, computer programs, and software are also disclosed.

    摘要翻译： 一种方法包括：对于所选择的用户设备，对于部分与所选用户设备相对应并且由多个小区的天线接收的信号，其中每个小区具有一个或多个天线，并且其中每个信号来自所述天线中的单个天线 执行以下操作：使用来自该小区的一个或多个信号来估计每个小区的载波频率偏移; 通过至少使用相关联的小区的估计的载波频率偏移来对来自每个小区的每个信号执行频率偏移校正; 估计每个频偏补偿信号的信道; 以及使用估计的信道组合每个频偏校正信号以产生从所选择的用户设备发送的一个或多个符号的一个或多个估计。 可以在组合之后执行第二频率偏移校正。 还公开了装置，计算机程序和软件。

    Methods of reverse link power control
    6.
    发明授权
    Methods of reverse link power control 有权
    反向链路功率控制方法

    公开(公告)号：US08712460B2

    公开(公告)日：2014-04-29

    申请号：US11355977

    申请日：2006-02-17

    申请人： Suman Das ,  Shirish Nagaraj ,  Harish Viswanathan

    发明人： Suman Das ,  Shirish Nagaraj ,  Harish Viswanathan

    IPC分类号： H04B7/00

    CPC分类号： H04W52/243 ,  H04W52/146 ,  H04W52/241 ,  H04W52/247

    摘要： Methods of reverse link power control are provided. In a first example reverse link power control process, a signal-to-interference+noise (SINR) is measured for a plurality of mobile stations. A power control adjustment is determined for each of the mobile stations based on the measured SINR for the mobile station and a fixed target SINR, the fixed target SINR being used in the determining step for each mobile station and sending the power control adjustments to the mobile stations. In a second example reverse link power control process, one or more signals are transmitted to a base station. A power control adjustment indicator indicating an adjustment to a transmission power level is received. The received power control adjustment is determined based on a measured signal-to-interference+noise ratio (SINR) for the one or more transmitted signals and a fixed target SINR threshold, the fixed target SINR threshold being used for power control adjustment of a plurality of mobile stations.

    摘要翻译： 提供了反向链路功率控制的方法。 在第一示例性的反向链路功率控制过程中，针对多个移动站测量信号与干扰+噪声（SINR）。 基于移动站的测量SINR和固定目标SINR确定每个移动站的功率控制调整，在每个移动台的确定步骤中使用固定目标SINR，并将功率控制调整发送到移动台 车站。 在第二示例性的反向链路功率控制过程中，一个或多个信号被发送到基站。 接收指示对发送功率电平的调整的功率控制调整指示符。 所接收的功率控制调整基于用于一个或多个发送信号的测量信号与干扰+噪声比（SINR）和固定目标SINR阈值来确定，固定目标SINR阈值用于多个功率控制调整 的移动台。

    Method to control the effects of out-of-cell interference in a wireless cellular system using backhaul transmission of decoded data and formats
    7.
    发明授权
    Method to control the effects of out-of-cell interference in a wireless cellular system using backhaul transmission of decoded data and formats 有权
    使用解码数据和格式的回程传输来控制无线蜂窝系统中的小区外干扰的影响的方法

    公开(公告)号：US08700042B2

    公开(公告)日：2014-04-15

    申请号：US11409162

    申请日：2006-04-21

    申请人： Shirish Nagaraj ,  Subramanian Vasudevan

    发明人： Shirish Nagaraj ,  Subramanian Vasudevan

    IPC分类号： H04W36/30

    CPC分类号： H04B15/00 ,  H04B1/71072 ,  H04B2201/70702 ,  H04J11/004 ,  H04J11/005 ,  H04W24/02

    摘要： Successfully decoded data received from a mobile terminal as well as the transmission format of that data is relayed over the backhaul from a base station receiver that successfully decoded the mobile terminal's transmission to the base stations in the mobile terminal's active set that presumably were unable to decode the mobile terminal's transmission due to inadequate signal-to-noise ratio. A base station that receives this transmission from the relaying base station that did'successfully decode and demodulate the mobile terminal's transmission is then able to reconstruct the data and subtract it from the total interference, thereby increasing the signal-to-noise ratio at this base station for its in-cell processing.

    摘要翻译： 从移动终端接收的成功解码的数据以及该数据的传输格式通过来自基站接收机的回程被中继，所述基站接收机将移动终端的传输成功地解码为移动终端的活动集中的基本无法解码的基站 由于信噪比不足，移动终端的传输。 接收来自已经成功解码和解调移动终端的传输的中继基站的这种传输的基站然后能够重建数据并从总干扰中减去数据，从而增加该基站的信噪比 车站用于其小区内处理。

    Method of OFDM communication using superposition coding
    9.
    发明申请
    Method of OFDM communication using superposition coding 有权
    使用叠加编码的OFDM通信方法

    公开(公告)号：US20080062857A1

    公开(公告)日：2008-03-13

    申请号：US11516840

    申请日：2006-09-07

    申请人： Pantelis Monogioudis ,  Shirish Nagaraj ,  Sivarama Krishnan Venkatesan ,  Harish Viswanathan

    发明人： Pantelis Monogioudis ,  Shirish Nagaraj ,  Sivarama Krishnan Venkatesan ,  Harish Viswanathan

    IPC分类号： H04J11/00

    CPC分类号： H04L27/2649 ,  H04L5/0007 ,  H04L27/2627

    摘要： Improvements are provided in an OFDM network that uses superposition coding. A broadcast signal and e.g. a unicast signal are each subjected to OFDM modulation including processing by an IDFT, combined, and transmitted using non-orthogonal transmission resources. In one approach, the respective signals are combined after instead of before the IDFT processing. In specific examples, a respective cyclic prefix is appended to each signal after the IDFT processing but before the respective signals are combined. In another approach, a broadcast pilot signal and e.g. a unicast pilot signal are transmitted concurrently with the broadcast and unicast information signals. The pilot signals are transmitted using the same time and subcarrier resources, but are made more distinguishable by combining each with a respective scrambling or spreading code. In specific examples, embodiments, the unicast pilot signal is used for estimating the data rate for transmission of further unicast information signals.

    摘要翻译： 在使用叠加编码的OFDM网络中提供了改进。 广播信号，例如。 单播信号各自进行OFDM调制，包括通过IDFT的处理，组合并使用非正交传输资源发送。 在一种方法中，相应的信号在IDFT处理之前被组合。 在具体示例中，在IDFT处理之后但在组合各个信号之前，将各个循环前缀附加到每个信号。 在另一种方法中，广播导频信号，例如， 单播导频信号与广播和单播信息信号同时发送。 导频信号使用相同的时间和子载波资源发送，但是通过将每一个与相应的加扰或扩展码相结合使得更加可区分。 在具体示例的实施例中，单播导频信号用于估计用于传输另外的单播信息信号的数据速率。

    Method for allocating transmit power in a wireless communication system
    10.
    发明申请
    Method for allocating transmit power in a wireless communication system 审中-公开
    在无线通信系统中分配发射功率的方法

    公开(公告)号：US20080051126A1

    公开(公告)日：2008-02-28

    申请号：US11507877

    申请日：2006-08-22

    申请人： Shirish Nagaraj ,  Anil M. Rao

    发明人： Shirish Nagaraj ,  Anil M. Rao

    IPC分类号： H04B7/00 ,  H04Q7/20

    CPC分类号： H04W52/146 ,  H04W52/325

    摘要： Disclosed is a method of setting reverse link traffic and pilot transmit powers in a wireless communications system based on traffic channel activity in order to lower average total transmit power on the reverse link and optimize reverse link capacity. As traffic channel activity decreases, the traffic transmit power relative to the pilot transmit power, i.e., traffic-to-pilot ratio (TPR), should increase. Increasing TPR will produce lower pilot transmit powers and higher traffic transmit powers. Although higher traffic transmit powers are undesirable, the effect on average total transmit power is lessen because the traffic channel is not active all the time. By contrast, the pilot channel is always active and, thus, it is desirable to sacrifice some performance of channel estimation in order to lower average total transmit power.

    摘要翻译： 公开了一种基于业务信道活动在无线通信系统中设置反向链路业务和导频发射功率的方法，以便降低反向链路上的平均总发射功率并优化反向链路容量。 随着业务信道活动减少，相对于导频发射功率的业务传输功率，即业务导频比（TPR），应增加。 增加TPR将产生较低的导频发射功率和较高的通信量传输功率。 虽然较高的流量发送功率是不期望的，但由于业务信道始终没有激活，所以对平均总发射功率的影响是减少的。 相比之下，导频信道总是有效的，因此，期望牺牲信道估计的一些性能以便降低平均总发射功率。