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    Maximum-likelihood frame synchronization algorithms for OFDM systems
    1.
    发明授权
    Maximum-likelihood frame synchronization algorithms for OFDM systems 有权
    OFDM系统的最大似然帧同步算法

    公开(公告)号：US08045636B1

    公开(公告)日：2011-10-25

    申请号：US12057221

    申请日：2008-03-27

    申请人： Jungwon Lee ,  Qing Zhao ,  Jihwan P. Choi

    发明人： Jungwon Lee ,  Qing Zhao ,  Jihwan P. Choi

    IPC分类号： H04L5/12 ,  H04L23/02

    CPC分类号： H04L27/2656 ,  H04L5/0048 ,  H04L27/2613 ,  H04L27/2675

    摘要： Autocorrelation algorithms are employed in systems and methods to detect preamble symbols for frame synchronization in WiMAX (Worldwide Interoperability for Microwave Access) or OFDMA (Orthogonal Frequency Division Multiple Access) systems. An ML (“Maximum Likelihood”) estimator estimates segment index and frame timing information for an ideal signal scenario. When using the ML estimator, a received time domain signal is sampled. Groups of samples are formed, and the group is further divided into a plurality of portions. Then, an autocorrelation between time domain samples of each portion results in a maximum value which indicates the start of a preamble of the time domain signal. Frame synchronization can then be performed. In other transmission scenarios, the algorithm is modified to use modified estimators of the preamble symbol location. When using the modified estimators, less than all of the portions of samples are compared to one another to find a maximum value.

    摘要翻译： 在WiMAX（全球微波接入互操作性）或OFDMA（正交频分多址）系统中用于检测用于帧同步的前同码符的系统和方法中采用自相关算法。 ML（“最大似然”）估计器估计理想信号场景的片段索引和帧定时信息。 当使用ML估计器时，对接收到的时域信号进行采样。 形成一组样品，并将该组进一步分成多个部分。 然后，每个部分的时域样本之间的自相关产生指示时域信号的前导码开始的最大值。 然后可以执行帧同步。 在其他传输场景中，修改算法以使用前导符号位置的修改估计器。 当使用修改后的估计量时，将少于样本的全部部分相互比较以找到最大值。

    Method and apparatus for jointly decoding independently encoded signals
    2.
    发明授权
    Method and apparatus for jointly decoding independently encoded signals 失效
    用于联合解码独立编码信号的方法和装置

    公开(公告)号：US08675755B1

    公开(公告)日：2014-03-18

    申请号：US12830100

    申请日：2010-07-02

    申请人： Jungwon Lee ,  Jihwan P. Choi

    发明人： Jungwon Lee ,  Jihwan P. Choi

    IPC分类号： H04L5/12

    CPC分类号： H04L1/0048 ,  H04L1/0041 ,  H04L25/03248 ,  H04L27/3488 ,  H04L2001/0093

    摘要： A received signal includes a plurality of user signals, the plurality of user signals including at least a first user signal and a second user signal. The first user signal corresponds to first user data that has been modulated independently of second user data corresponding to the second user signal. At least one of the first user signal or the second user signal is encoded with a finite state machine encoder independently of the other of the first user signal and the second user signal. The received signal is demodulated, wherein demodulating the received signal includes calculating distances between (i) each transmit symbol in the received signal and (ii) expected symbol values, wherein each expected symbol value corresponds to user data for multiple users including the first user and the second user. User data in the received signal including the first user data and the second user data is decoded based on the calculated distances.

    摘要翻译： 接收到的信号包括多个用户信号，所述多个用户信号至少包括第一用户信号和第二用户信号。 第一用户信号对应于已经独立于对应于第二用户信号的第二用户数据被调制的第一用户数据。 第一用户信号或第二用户信号中的至少一个与独立于第一用户信号和第二用户信号中的另一个的有限状态机编码器一起编码。 所接收的信号被解调，其中解调接收的信号包括计算（i）接收信号中的每个发送符号与（ii）预期符号值之间的距离，其中每个期望符号值对应于包括第一用户的多个用户的用户数据， 第二个用户。 基于计算出的距离对包括第一用户数据和第二用户数据的接收信号中的用户数据进行解码。

    Quality of service aware channel quality indicator
    4.
    发明授权
    Quality of service aware channel quality indicator 有权
    服务质量意识渠道质量指标

    公开(公告)号：US08531982B1

    公开(公告)日：2013-09-10

    申请号：US12917591

    申请日：2010-11-02

    申请人： Jungwon Lee ,  Jihwan P. Choi ,  Yakun Sun

    发明人： Jungwon Lee ,  Jihwan P. Choi ,  Yakun Sun

    IPC分类号： H04B17/00 ,  H04W24/00

    CPC分类号： H04W24/08 ,  H04L1/0026

    摘要： Systems, methods, and other embodiments associated with QoS-aware CQI are described. In one embodiment, an apparatus includes a channel quality indicator (CQI) determination logic configured to compute a quality of service (QoS) aware CQI as a function of a QoS associated with a wireless channel over which a first wireless communication apparatus and a second wireless communication apparatus communicate. The apparatus may also include a CQI report logic configured to report the QoS-aware CQI, in a CQI report message, to a wireless communication apparatus that requested the QoS-aware CQI in a CQI request message.

    摘要翻译： 描述与QoS感知CQI相关联的系统，方法和其他实施例。 在一个实施例中，一种装置包括信道质量指示符（CQI）确定逻辑，其被配置为根据与无线信道相关联的QoS来计算感知质量CQI（QoS），所述QoS与第一无线通信装置和第二无线 通信设备进行通信。 该装置还可以包括CQI报告逻辑，其被配置为在CQI报告消息中将QoS认知CQI报告给在CQI请求消息中请求QoS感知CQI的无线通信装置。

    Systems and methods for directing a beam towards a device in the presence of interference based on reciprocity
    5.
    发明授权
    Systems and methods for directing a beam towards a device in the presence of interference based on reciprocity 有权

    公开(公告)号：US08503291B1

    公开(公告)日：2013-08-06

    申请号：US12818430

    申请日：2010-06-18

    申请人： Jungwon Lee ,  Jihwan P. Choi

    发明人： Jungwon Lee ,  Jihwan P. Choi

    IPC分类号： G01R31/08 ,  H04Q7/00

    CPC分类号： H04B7/0456 ,  H04B7/0617

    摘要： Methods and apparatus are provided for directing a beam towards a receiving device in the presence of interference. A beam transmitted by a transmission source is received at a receiving device. The received beam is affected by an interference signal from an interfering source. The receiving device computes a covariance matrix that represents a channel estimate associated with the interfering source. The receiving device modifies a predetermined sounding signal based on the covariance matrix for transmission to the transmission source. The receiving device causes the transmission source to estimate an equivalent channel matrix based on the predetermined sounding signal and the modified predetermined sounding signal. The equivalent channel matrix represents the channel estimate associated with the interfering source and a channel estimate associated with the transmission source.

    Method and apparatus for decoding independently encoded signals
    6.
    发明授权
    Method and apparatus for decoding independently encoded signals 有权
    对独立编码信号进行解码的方法和装置

    公开(公告)号：US09184877B1

    公开(公告)日：2015-11-10

    申请号：US12940778

    申请日：2010-11-05

    申请人： Jungwon Lee ,  Jihwan P. Choi

    发明人： Jungwon Lee ,  Jihwan P. Choi

    IPC分类号： H04L27/06 ,  H04L1/00 ,  H03M13/41 ,  H03M13/00

    CPC分类号： H04L27/38 ,  H03M13/3905 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/4107 ,  H03M13/6325 ,  H03M13/6502 ,  H03M13/6525 ,  H04J11/0036 ,  H04L1/0048 ,  H04L1/0054 ,  H04L27/3488

    摘要： A received signal that includes a plurality of user signals is demodulated. The plurality of user signals includes at least a first user signal and a second user signal. The first user signal corresponds to first user data that has been modulated independently of second user data corresponding to the second user signal, and the first user signal is encoded with a first finite state machine encoder independently of the other user signals. The first finite state machine encoder has a number of states S1. The second user signal is encoded with a second finite state machine encoder independently of the other user signals, and the second finite state machine encoder has a number of states S2. Demodulating the received signal includes calculating distances between (i) each transmit symbol in the received signal and (ii) expected symbol values, wherein each expected symbol value corresponds to user data for multiple users including the first user and the second user. The first user data in the received signal is decoded based on the calculated distances utilizing a finite state machine decoder having S1 states.

    摘要翻译： 解调包括多个用户信号的接收信号。 多个用户信号至少包括第一用户信号和第二用户信号。 第一用户信号对应于已经独立于与第二用户信号相对应的第二用户数据被调制的第一用户数据，并且第一用户信号与第一有限状态机编码器编码，独立于其他用户信号。 第一有限状态机编码器具有多个状态S1。 第二用户信号用独立于其他用户信号的第二有限状态机编码器编码，而第二有限状态机编码器具有多个状态S2。 解调接收到的信号包括计算（i）接收信号中的每个发送符号与（ii）预期符号值之间的距离，其中每个预期符号值对应于包括第一用户和第二用户的多个用户的用户数据。 使用具有S1状态的有限状态机解码器，基于计算出的距离来解码接收信号中的第一用户数据。

    Positioning request in paging messages of wireless communication systems
    7.
    发明授权
    Positioning request in paging messages of wireless communication systems 失效
    无线通信系统寻呼消息中的定位请求

    公开(公告)号：US08718675B1

    公开(公告)日：2014-05-06

    申请号：US13165462

    申请日：2011-06-21

    申请人： Jihwan P. Choi ,  Jungwon Lee

    发明人： Jihwan P. Choi ,  Jungwon Lee

    IPC分类号： H04W24/00

    CPC分类号： H04W4/02 ,  H04W64/00 ,  H04W68/005 ,  H04W68/02

    摘要： Systems and techniques relating to wireless communications are described. A described technique includes generating a paging message for a wireless communication device, the paging message can include a positioning request; transmitting the paging message to the wireless communication device; and receiving, during a connection establishment process, a connection message from the wireless communication device. The connection message can include a positioning response that is responsive to the positioning request.

    摘要翻译： 描述与无线通信相关的系统和技术。 所描述的技术包括为无线通信设备生成寻呼消息，寻呼消息可以包括定位请求; 将所述寻呼消息发送到所述无线通信设备; 以及在连接建立过程期间从所述无线通信设备接收连接消息。 连接消息可以包括响应于定位请求的定位响应。

    Systems and methods for computing a relative path delay between multiple transmission sources
    8.
    发明授权
    Systems and methods for computing a relative path delay between multiple transmission sources 有权
    用于计算多个传输源之间的相对路径延迟的系统和方法

    公开(公告)号：US08379508B1

    公开(公告)日：2013-02-19

    申请号：US12835904

    申请日：2010-07-14

    申请人： Jungwon Lee ,  Jiwoong Choi ,  Jihwan P. Choi

    发明人： Jungwon Lee ,  Jiwoong Choi ,  Jihwan P. Choi

    IPC分类号： H04J11/00 ,  H04J3/06

    CPC分类号： H04W40/38 ,  H04J11/0063 ,  H04L25/0202 ,  H04L27/2601

    摘要： Systems and methods are provided for computing a relative path delay between multiple transmitting source to select a source that is closest to a receiving device. Preamble sequences unique to each source are received by a receiving device. The receiving devices determines based on a channel estimation or differential algorithm which transmitting source is closer to the receiving device. The channel estimation algorithm computes the path delay based on a channel estimation correlation at different preamble sequence indices. The differential algorithm computes the path delay based on a correlation between the received and transmitted preamble sequences at different preamble sequence indices. The receiving device selects the closer of the multiple sources to be the source from which to extract data.

    摘要翻译： 提供的系统和方法用于计算多个发送源之间的相对路径延迟，以选择最接近接收设备的源。 每个源独有的前导序列由接收设备接收。 接收装置基于信道估计或差分算法确定发射源更靠近接收装置。 信道估计算法基于在不同前同步码序列索引处的信道估计相关性来计算路径延迟。 差分算法基于在不同前同步码序列索引处的接收和发送前同步码序列之间的相关性来计算路径延迟。 接收设备选择要从中提取数据的源的更多的源。

    Link adaptation for OFDM systems
    9.
    发明授权
    Link adaptation for OFDM systems 有权
    OFDM系统的链路适配

    公开(公告)号：US08300716B1

    公开(公告)日：2012-10-30

    申请号：US12328443

    申请日：2008-12-04

    申请人： Jungwon Lee ,  Jihwan P. Choi ,  Hui-Ling Lou

    发明人： Jungwon Lee ,  Jihwan P. Choi ,  Hui-Ling Lou

    IPC分类号： H04L27/28

    CPC分类号： H04L1/0019 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/203 ,  H04L5/0007 ,  H04L5/0046 ,  H04W24/08

    摘要： A method of adaptively selecting a modulation and coding scheme (MCS) of a communication link includes obtaining a first parameter corresponding to a Quality of Service (QoS) requirement of the communication link, obtaining a second parameter indicative of a physical condition of the communication link, selecting an MCS based on at least the first parameter and the second parameter.

    摘要翻译： 自适应地选择通信链路的调制和编码方案（MCS）的方法包括：获得与通信链路的服务质量（QoS）要求对应的第一参数，获得指示通信链路的物理状况的第二参数 至少基于第一参数和第二参数选择MCS。