公开(公告)号：US20120201281A1

公开(公告)日：2012-08-09

申请号：US13448275

申请日：2012-04-16

申请人： Sriram MUDULODU ,  Louay Jalloul

发明人： Sriram MUDULODU ,  Louay Jalloul

IPC分类号： H04B1/38

CPC分类号： H04L27/2626 ,  H04L5/0023 ,  H04L27/2647

摘要： Method and system for wireless communication in an Orthogonal Frequency Division Multiplexing (OFDM) communication system is disclosed. The method involves receiving a plurality of receive-signals over a first set of antennas. Further, one or more of the plurality of receive-signals are cyclically delayed to generate one or more cyclically delayed receive-signal. Subsequently, one or more of the plurality of receive-signals are combined with one or more of the cyclically delayed receive-signals. In other words, the method involves performing receive. Cyclic Delay Diversity (CDD).

摘要翻译： 公开了正交频分复用（OFDM）通信系统中无线通信的方法和系统。 该方法涉及通过第一组天线接收多个接收信号。 此外，多个接收信号中的一个或多个被循环地延迟以产生一个或多个循环延迟的接收信号。 随后，多个接收信号中的一个或多个与一个或多个循环延迟的接收信号组合。 换句话说，该方法涉及执行接收。 循环延迟多样性（CDD）。

公开(公告)号：US08086928B2

公开(公告)日：2011-12-27

申请号：US11893329

申请日：2007-08-15

申请人： Louay Jalloul ,  Sriram Mudulodu

发明人： Louay Jalloul ,  Sriram Mudulodu

IPC分类号： H03M13/00

CPC分类号： H03M13/2975

摘要： The invention provides methods and systems for terminating an iterative decoding process of a Forward Error Correction block (FEC). The iterative decoding process of the FEC block is terminated upon determining that the FEC block cannot be decoded successfully. A method comprises calculating a metric based on one or more Log Likelihood Ratios (LLRs) corresponding to a first number of iterations of the iterative decoding process of the FEC block. The method further comprises, formulating one or more stopping criteria for the iterative decoding process based on a variation pattern of the metric over a second predetermined number of iterations of the iterative decoding process. The second predetermined number of iterations is a subset of the first number of iterations. Moreover, the method comprises terminating the iterative decoding process of the FEC block based on the one or more stopping criteria.

摘要翻译： 本发明提供了用于终止前向纠错块（FEC）的迭代解码过程的方法和系统。 在确定FEC块不能被成功解码的情况下，终止FEC块的迭代解码处理。 一种方法包括基于与FEC块的迭代解码处理的第一迭代次数相对应的一个或多个对数似然比（LLR）来计算度量。 该方法还包括：基于迭代解码过程的第二预定迭代次数的度量的变化模式，为迭代解码过程制定一个或多个停止标准。 第二预定次数的迭代是第一次迭代次数的子集。 此外，该方法包括基于一个或多个停止标准终止FEC块的迭代解码处理。

公开(公告)号：US20090141832A1

公开(公告)日：2009-06-04

申请号：US11998541

申请日：2007-11-30

申请人： Sriram Mudulodu ,  Louay Jalloul ,  Bertrand Hochwald

发明人： Sriram Mudulodu ,  Louay Jalloul ,  Bertrand Hochwald

IPC分类号： H04L27/22

CPC分类号： H04L27/2657 ,  H04L27/2675 ,  H04L2027/0046

摘要： A method and system of estimating frequency offset of a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, wherein the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols includes a plurality of pilot sub-carriers. The subscriber station selects at least one group of the plurality of pilot sub-carriers within the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations. The frequency offset is estimated based on a conjugate product between a linear combination of received symbols of a first multi-carrier symbol of a pair of multi-carrier symbols with a linear combination of received symbols of a second multi-carrier symbol of the pair of multi-carrier symbols on each of the pilot sub-carriers of the at least one group of the plurality of pilot sub-carriers.

摘要翻译： 公开了一种估计用户台频偏的方法和系统。 该方法包括用户站接收复合信号，其中复合信号包括从多个基站发射的多载波信号。 用户站选择多个基站的子集。 用户站选择复合信号的至少一对多载波符号，其中至少一对多载波符号中的每一个包括多个导频子载波。 用户台基于由子载波的子集发送的多载波信号的导频子载波的发送导频符号来选择至少一个多载波符号对内的多个导频子载波中的至少一个组 多个基站。 基于一对多载波符号的第一多载波符号的接收符号的线性组合与一对多载波符号的第二多载波符号的接收符号的线性组合，估计频偏 所述多个导频子载波中的至少一个组的每个导频子载波上的多载波符号。

公开(公告)号：US08654695B2

公开(公告)日：2014-02-18

申请号：US12002208

申请日：2007-12-14

申请人： Louay Jalloul ,  Sriram Mudulodu ,  Djordje Tujkovic ,  Kamesh Medepalli

发明人： Louay Jalloul ,  Sriram Mudulodu ,  Djordje Tujkovic ,  Kamesh Medepalli

IPC分类号： H04H20/71

CPC分类号： H04L1/0019 ,  H04L1/0003 ,  H04L1/0026 ,  H04L1/0027 ,  H04L2001/0093

摘要： A method and apparatus of link adaptation of a broadcast system is disclosed. The method includes a base station adaptively determining a signal quality threshold. The base station broadcasts a signal, wherein the signal includes the signal quality threshold. A plurality of subscribers receives the signal, and measure a signal quality. Each of a subset of the plurality of subscribers transmits back to the base station an indicator of whether the received signal has a measured signal quality that is either above or below the signal quality threshold. A percentage of subscribers that receive the signal having a received signal quality above the signal quality threshold is estimated. A transmission modulation format and coding is selected based on the estimated percentage.

摘要翻译： 公开了广播系统的链路自适应的方法和装置。 该方法包括基站自适应地确定信号质量阈值。 基站广播信号，其中信号包括信号质量阈值。 多个用户接收信号，并测量信号质量。 多个用户的子集中的每一个向基站发送接收信号是否具有高于或低于信号质量阈值的测量信号质量的指示符。 估计接收信号质量高于信号质量阈值的信号的用户的百分比。 基于估计的百分比来选择传输调制格式和编码。

公开(公告)号：US08437415B2

公开(公告)日：2013-05-07

申请号：US12900094

申请日：2010-10-07

申请人： Sriram Mudulodu ,  Louay Jalloul

发明人： Sriram Mudulodu ,  Louay Jalloul

IPC分类号： H04L27/28

CPC分类号： H04L27/2657 ,  H04L5/0007 ,  H04L5/005 ,  H04L27/2675

摘要： A method and system of estimating frequency offset at a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, in which the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols include a plurality of pilot sub-carriers. The subscriber station selects a subset of the plurality of pilot sub-carriers of the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations. The frequency offset is estimated based on a conjugate product between received symbols across at least one pair of multi-carrier symbols of each of the pilot sub-carriers of the selected subset of the plurality of pilot sub-carriers.

公开(公告)号：US08160188B2

公开(公告)日：2012-04-17

申请号：US12317162

申请日：2008-12-18

申请人： Sriram Mudulodu ,  Louay Jalloul

发明人： Sriram Mudulodu ,  Louay Jalloul

IPC分类号： H04B7/10

CPC分类号： H04L27/2626 ,  H04L5/0023 ,  H04L27/2647

摘要： Method and system for wireless communication in an Orthogonal Frequency Division Multiplexing (OFDM) communication system is disclosed. The method involves receiving a plurality of receive-signals over a first set of antennas. Further, one or more of the plurality of receive-signals are cyclically delayed to generate one or more cyclically delayed receive-signal. Subsequently, one or more of the plurality of receive-signals are combined with one or more of the cyclically delayed receive-signals. In other words, the method involves performing receive Cyclic Delay Diversity (CDD).

摘要翻译： 公开了正交频分复用（OFDM）通信系统中无线通信的方法和系统。 该方法涉及通过第一组天线接收多个接收信号。 此外，多个接收信号中的一个或多个被循环地延迟以产生一个或多个循环延迟的接收信号。 随后，多个接收信号中的一个或多个与一个或多个循环延迟的接收信号组合。 换句话说，该方法涉及执行接收循环延迟分集（CDD）。

公开(公告)号：US20110019778A1

公开(公告)日：2011-01-27

申请号：US12900094

申请日：2010-10-07

申请人： Sriram Mudulodu ,  Louay Jalloul

发明人： Sriram Mudulodu ,  Louay Jalloul

IPC分类号： H04L27/06

CPC分类号： H04L27/2657 ,  H04L5/0007 ,  H04L5/005 ,  H04L27/2675

摘要： A method and system of estimating frequency offset at a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, in which the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols include a plurality of pilot sub-carriers. The subscriber station selects a subset of the plurality of pilot sub-carriers of the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations. The frequency offset is estimated based on a conjugate product between received symbols across at least one pair of multi-carrier symbols of each of the pilot sub-carriers of the selected subset of the plurality of pilot sub-carriers.

摘要翻译： 公开了一种估计用户台频偏的方法和系统。 该方法包括用户站接收复合信号，其中复合信号包括从多个基站发送的多载波信号。 用户站选择多个基站的子集。 用户站选择复合信号的至少一对多载波符号，其中至少一对多载波符号中的每一个包括多个导频子载波。 用户站基于由多个子载波子集的子集发送的多载波信号的导频子载波的发射导频符号来选择至少一对多载波码元的多个导频子载波的子集 基站 基于多个导频子载波的所选子集的每个导频子载波的至少一对多载波符号之间的接收符号之间的共轭乘积来估计频率偏移。

公开(公告)号：US07813437B2

公开(公告)日：2010-10-12

申请号：US11900799

申请日：2007-09-13

申请人： Sriram Mudulodu ,  Louay Jalloul

发明人： Sriram Mudulodu ,  Louay Jalloul

IPC分类号： H04L27/28

CPC分类号： H04L27/2657 ,  H04L5/0007 ,  H04L5/005 ,  H04L27/2675

摘要： A method and system of estimating frequency offset at a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, in which the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols include a plurality of pilot sub-carriers. The subscriber station selects a subset of the plurality of pilot sub-carriers of the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations. The frequency offset is estimated based on a conjugate product between received symbols across at least one pair of multi-carrier symbols of each of the pilot sub-carriers of the selected subset of the plurality of pilot sub-carriers.

摘要翻译： 公开了一种估计用户台频偏的方法和系统。 该方法包括用户站接收复合信号，其中复合信号包括从多个基站发送的多载波信号。 用户站选择多个基站的子集。 用户站选择复合信号的至少一对多载波符号，其中至少一对多载波符号中的每一个包括多个导频子载波。 用户站基于由多个子载波子集的子集发送的多载波信号的导频子载波的发射导频符号来选择至少一对多载波码元的多个导频子载波的子集 基站 基于多个导频子载波的所选子集的每个导频子载波的至少一对多载波符号之间的接收符号之间的共轭乘积来估计频率偏移。

公开(公告)号：US20090034558A1

公开(公告)日：2009-02-05

申请号：US11888256

申请日：2007-07-31

申请人： Sriram Mudulodu ,  Louay Jalloul

发明人： Sriram Mudulodu ,  Louay Jalloul

IPC分类号： H04J3/06

CPC分类号： H04L27/2656 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/0092 ,  H04L25/0224 ,  H04L27/261 ,  H04L27/2662 ,  H04L27/2675 ,  H04W52/0216 ,  H04W52/0219 ,  Y02D70/146

摘要： The present invention provides methods and systems for detecting a start symbol of a second zone of a frame. One or more symbol indices corresponding to one or more symbols of the second zone of a frame are derived. One or more codes on pilot sub-carriers corresponding to the one or more symbol indices may also be derived. Based on the one or more symbol indices a set of possible start symbol indices is established. Thereafter, a frame is received comprising one or more of a preamble symbol, a first zone and the second zone. It is determined if the received frame comprises the second zone. If the second zone is present in the received frame, the start symbol index of the second zone of the received frame is determined based on the detection of one or more codes and the set of possible start symbol indices. The present invention further provides methods and systems for detecting a Nth symbol of a frame.

摘要翻译： 本发明提供了用于检测帧的第二区的起始符号的方法和系统。 导出与帧的第二区域的一个或多个符号相对应的一个或多个符号索引。 也可以导出对应于一个或多个符号索引的导频子载波上的一个或多个码。 基于一个或多个符号索引，建立一组可能的起始符号索引。 此后，接收包括前导符号，第一区和第二区中的一个或多个的帧。 确定接收帧是否包括第二区。 如果接收到的帧中存在第二区域，则基于检测到一个或多个代码和可能的起始符号索引的集合来确定接收帧的第二区域的起始符号索引。 本发明还提供了用于检测帧的第N个符号的方法和系统。

公开(公告)号：US08515476B2

公开(公告)日：2013-08-20

申请号：US13526100

申请日：2012-06-18

申请人： Sam P. Alex ,  Louay Jalloul ,  Robert Lorenz

发明人： Sam P. Alex ,  Louay Jalloul ,  Robert Lorenz

IPC分类号： H04B7/00

CPC分类号： H04W72/0453 ,  H04B7/0671 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/006

摘要： Embodiments for at least one method and apparatus of a subscriber station transceiver allocating and transmitting groups of subcarriers between a plurality of transceiver antennas are disclosed. One method includes the subscriber station transceiver receiving at least one downlink signal through each of the plurality of subscriber station antennas. The subscriber station transceiver characterizes a received signal of the at least one downlink signal over multiple subcarriers. The subscriber station transceiver allocates groups of subcarriers for uplink transmission through each of the plurality of subscriber antennas, wherein the allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers.

摘要翻译： 公开了用于在多个收发天线之间分配和发送子载波组的用户站收发机的至少一种方法和装置的实施例。 一种方法包括订户站收发机通过多个用户台天线中的每一个接收至少一个下行链路信号。 订户站收发机通过多个子载波来表征至少一个下行链路信号的接收信号。 订户站收发机通过多个用户天线中的每一个分配用于上行链路传输的子载波组，其中，所述分配基于多个子载波上的至少一个下行链路信号的表征的接收信号。