专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

91. 发明申请

US20050281290A1 Signal acquisition in a wireless communication system 有权
标题翻译：无线通信系统中的信号采集
公开(公告)号：US20050281290A1
公开(公告)日：2005-12-22
申请号：US11022519
申请日：2004-12-22
申请人： Aamod Khandekar , Avneesh Agrawal
发明人： Aamod Khandekar , Avneesh Agrawal
IPC分类号： H04L27/26 , H04J3/06
CPC分类号： H04L5/0048 , H04B1/7077 , H04B2201/70701 , H04B2201/70702 , H04L5/0026 , H04L25/0204 , H04L25/03866 , H04L27/2613 , H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： Each base station transmits a TDM pilot 1 having multiple instances of a pilot-1 sequence generated with a PN1 sequence and a TDM pilot 2 having at least one instance of a pilot-2 sequence generated with a PN2 sequence. Each base station is assigned a specific PN2 sequence that uniquely identifies that base station. A terminal uses TDM pilot 1 to detect for the presence of a signal and uses TDM pilot 2 to identify base stations and obtain accurate timing. For signal detection, the terminal performs delayed correlation on received samples and determines whether a signal is present. If a signal is detected, the terminal performs direct correlation on the received samples with PN1 sequences for K1 different time offsets and identifies K2 strongest TDM pilot 1 instances. For time synchronization, the terminal performs direct correlation on the received samples with PN2 sequences to detect for TDM pilot 2.
摘要翻译：每个基站发送具有由PN1序列生成的导频1序列的多个实例的TDM导频1和具有由PN2序列生成的导频-2序列的至少一个实例的TDM导频2。为每个基站分配唯一标识该基站的特定PN2序列。终端使用TDM导频1检测信号的存在，并使用TDM导频2识别基站并获得准确的定时。对于信号检测，终端在接收到的采样上执行延迟相关，并确定信号是否存在。如果检测到信号，则终端对于接收到的样本与用于不同时间偏移的PN1序列进行直接相关，并识别最强的TDM导频1实例。对于时间同步，终端对PN2序列的接收样本执行直接相关，以检测TDM导频2。

92. 发明授权

US06879576B1 Method and apparatus for processing a physical channel with partial transport format information 失效
标题翻译：用部分传输格式信息处理物理信道的方法和装置
公开(公告)号：US06879576B1
公开(公告)日：2005-04-12
申请号：US09655609
申请日：2000-09-06
申请人： Avneesh Agrawal , Daisuke Terasawa
发明人： Avneesh Agrawal , Daisuke Terasawa
IPC分类号： H04J13/20 , H04B1/7117 , H04B7/26 , H04J11/00 , H04J13/00 , H04Q7/38 , H04B7/216
CPC分类号： H04J13/0044 , H04B7/2628 , H04B2201/70705 , H04B2201/709709
摘要： Techniques for recovering data transmitted on a physical channel in which the channelization code is not known at the time of the data recovery. A modulated signal is received an processed to provide received samples. A hypothesized channelization code (e.g., an OVSF code in the W-CDMA system) is selected and used to process the received samples to generate partially processed symbols. The hypothesized channelization code is a “base” code that can be used to generate all possible channelization codes that may have been used for the physical channel. Intermediate results representative of the partially processed symbols are stored and, upon determination of the actual channelization code, further processed in accordance with the actual and hypothesized channelization codes to provide the final results.
摘要翻译：用于恢复在数据恢复时信道化码不知道的物理信道上发送的数据的技术。接收经处理的调制信号以提供接收的采样。选择假设的信道化码（例如，W-CDMA系统中的OVSF码）并用于处理接收到的采样以产生部分处理的符号。假设的信道化码是可以用于生成可能已经用于物理信道的所有可能的信道化码的“基”码。代表部分处理的符号的中间结果被存储，并且在确定实际信道化码后，根据实际和假设的信道化码进一步处理以提供最终结果。

93. 发明授权

US06249539B1 System and method for narrowing the range of frequency uncertainty of a doppler shifted signal 失效
标题翻译：用于缩小多普勒偏移信号的频率不确定度范围的系统和方法
公开(公告)号：US06249539B1
公开(公告)日：2001-06-19
申请号：US09097842
申请日：1998-06-15
申请人： Brian Harms , Sherman A. Gregory , Brian K. Butler , Avneesh Agrawal
发明人： Brian Harms , Sherman A. Gregory , Brian K. Butler , Avneesh Agrawal
IPC分类号： H04B1500
CPC分类号： H04B7/216 , G01S19/29 , H04B1/707 , H04L2027/0034
摘要： A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.
摘要翻译：一种用于在具有相对信号源和接收机运动的卫星或其他通信系统中缩小多普勒频移导频信号的频率不确定度的范围的系统和方法。卫星通信系统包括用户终端（例如，移动无线电话），网关（地面基站）和至少一个具有未知位置和未知相对速度的卫星。该方法包括以下步骤：通过多个频率假设移位导频信号，通过多个码片相干累加导频信号的采样，测量累积的导频信号样本的能量，将多个码片上的能量测量累积到产生能量累积值，并且确定多个频率假设中的哪一个导致最高的能量积累值。

94. 发明授权

US6134215A Using orthogonal waveforms to enable multiple transmitters to share a single CDM channel 失效
标题翻译：使用正交波形使多个发射机能够共享单个CDM信道
公开(公告)号：US6134215A
公开(公告)日：2000-10-17
申请号：US627831
申请日：1996-04-02
申请人： Avneesh Agrawal , Brian K. Butler
发明人： Avneesh Agrawal , Brian K. Butler
IPC分类号： H04B1/04 , H04B7/216 , H04B7/26 , H04J11/00 , H04J13/00 , H04J13/18 , H04Q7/38 , H04J13/02
CPC分类号： H04J13/0048 , H04J13/18
摘要： A system and method for enabling multiple transmitters (400) to share a single code division multiplexed (CDM) or code division multiple access (CDMA) channel using orthogonal waveforms. A set of orthogonal channelizing codes W.sub.i (t) is generated, and each transmitter (400) is allocated orthogonal channelizing codes and pseudonoise polynomials in a predetermined manner. The transmitters channelize each user signal using an orthogonal channelizing code W.sub.i (t), and spread each user signal using a pseudonoise (PN) spreading code. Each transmitter employs the same PN spreading codes and time offsets. Additionally, no one orthogonal channelizing code is assigned to more than one transmitter during the time period they are sharing a CDM channel. The spread signals are summed at each transmitter (404) prior to transmission as a composite signal. The offsets are time-precorrected (406, 510) to ensure time alignment at the receivers. The frequencies of the signals are precorrected (408, 512) to ensure frequency alignment at the receivers.
摘要翻译：一种用于使多个发射机（400）能够使用正交波形来共享单个码分多路复用（CDM）或码分多址（CDMA）信道的系统和方法。生成一组正交信道化码Wi（t），并且以预定的方式为每个发射机（400）分配正交信道化码和伪噪声多项式。发射机使用正交信道化码Wi（t）对每个用户信号进行信道化，并且使用伪噪声（PN）扩频码来扩展每个用户信号。每个发射机采用相同的PN扩展码和时间偏移。另外，在共享CDM信道的时间段期间，没有一个正交信道化码被分配给多个发射机。扩展信号在发送之前在每个发射机（404）处相加，作为复合信号。偏移量被时间预校正（406,510），以确保接收器处的时间对准。信号的频率被预先校正（408,512）以确保接收器处的频率对准。

95. 发明授权

US09385843B2 Method and apparatus for using multiple modulation schemes for a single packet 有权
公开(公告)号：US09385843B2
公开(公告)日：2016-07-05
申请号：US11022538
申请日：2004-12-22
申请人： Aamod Khandekar , Avneesh Agrawal
发明人： Aamod Khandekar , Avneesh Agrawal
IPC分类号： H04L27/18 , H04L1/18 , H04L1/00 , H04L1/16
CPC分类号： H04L1/0003 , H04L1/0009 , H04L1/0025 , H04L1/0054 , H04L1/1671 , H04L1/1819 , H04L1/1845 , H04L1/1861 , H04L1/1893 , Y02D50/10
摘要： Techniques for using multiple modulation schemes for a single packet are described. Each data packet is processed and transmitted in up to T blocks, where T>1. Multiple modulation schemes are used for the T blocks to achieve good performance. A transmitter encodes a data packet to generate code bits. The transmitter then forms a block of code bits with the code bits generated for the packet, determines the modulation scheme to use for the block (e.g., based on a mode/rate selected for the packet), maps the code bits for the block based on the modulation scheme to obtain data symbols, and processes and transmits the block of data symbols to a receiver. The transmitter generates and transmits another block in similar manner until the data packet is decoded correctly or all T blocks have been transmitted. The receiver performs the complementary processing to receive and decode the packet.

96. 发明授权

US09215581B2 Distance-based presence management 有权
标题翻译：基于距离的在线管理
公开(公告)号：US09215581B2
公开(公告)日：2015-12-15
申请号：US11692097
申请日：2007-03-27
申请人： David Jonathan Julian , Chong U. Lee , Kamran Moallemi , Avneesh Agrawal , Manuel E. Jaime , Robert Keith Douglas , Lu Xiao , Gregory Gordon Rose
发明人： David Jonathan Julian , Chong U. Lee , Kamran Moallemi , Avneesh Agrawal , Manuel E. Jaime , Robert Keith Douglas , Lu Xiao , Gregory Gordon Rose
IPC分类号： H04B7/00 , H04W8/02 , H04L29/08 , H04W8/22 , H04W64/00 , G01S11/06 , G01S13/08
CPC分类号： H04W8/02 , G01S11/06 , G01S13/08 , H04L67/24 , H04W8/22 , H04W64/006
摘要： Various operations may be performed based on a distance-related function associated with two or more devices. For example, an association procedure for two or more devices may be based on one or more determined distances. Similarly, presence management may be based on one or more determined distances. A distance-related function may take various form including, for example, a distance between devices, two or more distances between devices, a rate of change in a relative distance between devices, relative acceleration between devices, or some combination of two or more of the these distance-related functions.
摘要翻译：可以基于与两个或更多个设备相关联的距离相关功能来执行各种操作。例如，两个或多个设备的关联过程可以基于一个或多个确定的距离。类似地，存在管理可以基于一个或多个确定的距离。距离相关功能可以采取各种形式，包括例如设备之间的距离，设备之间的两个或更多个距离，设备之间的相对距离的变化率，设备之间的相对加速度，或两个或更多个这些距离相关的功能。

97. 发明授权

US08934516B2 Soft handoff with interference cancellation in a wireless frequency hopping communication system 有权
标题翻译：在无线跳频通信系统中具有干扰消除的软切换
公开(公告)号：US08934516B2
公开(公告)日：2015-01-13
申请号：US11682258
申请日：2007-03-05
申请人： Avneesh Agrawal
发明人： Avneesh Agrawal
IPC分类号： H04B1/713 , H04W4/00 , H04B15/00 , H04L27/26 , H04B1/715 , H04W36/18 , H04W24/00 , H04W28/04 , H04W72/04
CPC分类号： H04L27/2601 , H04B1/715 , H04B2001/7152 , H04W24/00 , H04W28/04 , H04W36/18 , H04W72/04
摘要： Techniques are provided to support soft handoff in a frequency hopping OFDMA system. Each sector concurrently supports “non-handoff” users and “soft-handoff” users. A non-handoff user communicates with only one sector, and a soft-handoff user communicates with multiple sectors simultaneously. Non-handoff users are assigned traffic channels by their sole sectors, and soft-handoff users are assigned traffic channels by their “serving” sectors. For each sector, the traffic channels assigned to the non-handoff users are orthogonal to one another and may or may not be orthogonal to the traffic channels assigned to the soft-handoff users. Each sector processes its received signal and recovers the data transmissions from the non-handoff users of that sector. Each sector then estimates the interference due to the non-handoff users and cancels the interference from the received signal. Each sector further processes its interference-canceled signal to recover the data transmissions from the soft-handoff users.
摘要翻译：提供技术来支持跳频OFDMA系统中的软切换。每个部门同时支持“非切换”用户和“软切换”用户。非切换用户仅与一个扇区通信，并且软切换用户同时与多个扇区进行通信。非切换用户由其唯一扇区分配业务信道，并且软切换用户由其“服务”扇区分配业务信道。对于每个扇区，分配给非切换用户的业务信道彼此正交，并且可以或可以不与分配给软切换用户的业务信道正交。每个扇区处理其接收到的信号并恢复来自该扇区的非切换用户的数据传输。然后每个扇区估计由于非切换用户造成的干扰并且从接收到的信号中消除干扰。每个扇区进一步处理其干扰消除信号以恢复来自软切换用户的数据传输。

98. 发明授权

US08886125B2 Distance-based association 有权
标题翻译：基于距离的关联
公开(公告)号：US08886125B2
公开(公告)日：2014-11-11
申请号：US11692100
申请日：2007-03-27
申请人： Avneesh Agrawal , Chong U. Lee , Kamran Moallemi , David Jonathan Julian , Manuel E. Jaime , Robert Keith Douglas , Gregory Gordon Rose , Lu Xiao
发明人： Avneesh Agrawal , Chong U. Lee , Kamran Moallemi , David Jonathan Julian , Manuel E. Jaime , Robert Keith Douglas , Gregory Gordon Rose , Lu Xiao
IPC分类号： H04B7/00 , G01S13/76 , H04L29/08 , G01S13/28 , G01S13/02 , H04W4/02 , H04W8/00 , H04W4/00
CPC分类号： H04W76/14 , A61B5/0015 , A61B5/0404 , G01S13/0209 , G01S13/284 , G01S13/765 , H04B5/0031 , H04L63/0861 , H04L67/24 , H04W4/02 , H04W4/023 , H04W4/027 , H04W4/50 , H04W8/005 , H04W12/06
摘要： Various operations may be performed based on a distance-related function associated with two or more devices. For example, an association procedure for two or more devices may be based on one or more determined distances. Similarly, presence management may be based on one or more determined distances. A distance-related function may take various form including, for example, a distance between devices, two or more distances between devices, a rate of change in a relative distance between devices, relative acceleration between devices, or some combination of two or more of the these distance-related functions.
摘要翻译：可以基于与两个或更多个设备相关联的距离相关功能来执行各种操作。例如，两个或多个设备的关联过程可以基于一个或多个确定的距离。类似地，存在管理可以基于一个或多个确定的距离。距离相关功能可以采取各种形式，包括例如设备之间的距离，设备之间的两个或更多个距离，设备之间的相对距离的变化率，设备之间的相对加速度，或两个或更多个这些距离相关的功能。

99. 发明授权

US08885550B2 Beacon symbol orthogonalization 有权
标题翻译：信标符号正交化
公开(公告)号：US08885550B2
公开(公告)日：2014-11-11
申请号：US12446689
申请日：2007-10-26
申请人： Ravi Palanki , Alexei Gorokhov , Aamod Khandekar , Avneesh Agrawal
发明人： Ravi Palanki , Alexei Gorokhov , Aamod Khandekar , Avneesh Agrawal
IPC分类号： H04W4/00 , H04L27/26 , H04W72/04 , H04W28/00
CPC分类号： H04L27/261 , H04W28/00 , H04W72/04
摘要： Beacon symbols are sent periodically from the base stations in an OFDM system. The entire power of the base station, or a large portion of it is concentrated in these symbols, thus they are very easily recognized by the mobile stations. The frequencies upon which these symbols are transmitted and the time at which they are transmitted communicates information such as the base station/sector identity and the preferred carrier of the given base station/sector to the mobile station. In order to avoid collision between the beacon symbols of different base stations and sectors, the beacon symbols from different base stations/sectors are transmitted at different symbols times and on different subcarriers.
摘要翻译：信标符号在OFDM系统中从基站周期性地发送。基站的整个功率或其大部分集中在这些符号中，因此它们被移动台非常容易地识别。发送这些符号的频率和它们被发送的时间将诸如基站/扇区标识和给定基站/扇区的优选载波的信息传送给移动站。为了避免不同基站和扇区的信标符号之间的冲突，来自不同基站/扇区的信标符号在不同的符号时间和不同子载波上发送。

100. 发明授权

US08879511B2 Assignment acknowledgement for a wireless communication system 有权
公开(公告)号：US08879511B2
公开(公告)日：2014-11-04
申请号：US11370638
申请日：2006-03-07
申请人： Avneesh Agrawal , Aamod Khandekar , Alexei Gorokhov
发明人： Avneesh Agrawal , Aamod Khandekar , Alexei Gorokhov
IPC分类号： H04L5/00 , H04W72/00 , H04W72/14 , H04L5/02
CPC分类号： H04W72/14 , H04L5/023
摘要： A method, apparatus, and channel structure for acknowledging assignment messages is provided. The method and apparatus allow for efficient signaling based upon the resources.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式