专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US08205132B2 Cooperative concatenated coding for wireless systems 有权
标题翻译：无线系统的协同级联编码
公开(公告)号：US08205132B2
公开(公告)日：2012-06-19
申请号：US12105319
申请日：2008-04-18
申请人： Ernest Sze Yuen Lo , Khaled Ben Letaief
发明人： Ernest Sze Yuen Lo , Khaled Ben Letaief
IPC分类号： G06F11/00
CPC分类号： H03M13/2972 , H03M13/2933 , H04L1/0059 , H04L1/0065 , H04L2001/0097
摘要： Cooperative concatenated coding techniques are provided for wireless communications between at least two users and a base station. A network system employing cooperative concatenated coding includes cooperating user devices each configured to encode and transmit at least a portion of a joint message. The joint message includes at least a portion of a first message from a first cooperating user device and at least a portion of a second message from a second cooperating user device. An embodiment includes encoding a first message from a first cooperating user, receiving a second message from a second cooperating user and decoding the second message. The methodology also includes re-encoding at least a portion of the decoded message with at least a portion of the first message to form a combined message, and then transmitting at least a portion of the combined message.
摘要翻译：提供了用于至少两个用户和基站之间的无线通信的协作级联编码技术。采用协同级联编码的网络系统包括协作用户设备，每个配置用户设备被配置为对联合消息的至少一部分进行编码和发送。联合消息包括来自第一协作用户设备的第一消息的至少一部分和来自第二协作用户设备的第二消息的至少一部分。实施例包括从第一协作用户编码第一消息，从第二协作用户接收第二消息并解码第二消息。该方法还包括用至少一部分第一消息重新编码解码消息的至少一部分以形成组合消息，然后发送组合消息的至少一部分。

2. 发明申请

US20110312368A1 POWER CONTROL IN COGNITIVE RADIO SYSTEMS BASED ON SPECTRUM SENSING SIDE INFORMATION 有权
标题翻译：基于光谱感知信息的认知无线电系统的功率控制
公开(公告)号：US20110312368A1
公开(公告)日：2011-12-22
申请号：US13223120
申请日：2011-08-31
申请人： Karama Hamdi , Wei Zhang , Khaled Ben Letaief
发明人： Karama Hamdi , Wei Zhang , Khaled Ben Letaief
IPC分类号： H04W52/04
CPC分类号： H04W52/26 , H04W16/14 , H04W52/242 , H04W52/243 , H04W52/246 , H04W52/265 , H04W52/283 , H04W64/00
摘要： For cognitive radio systems, the transmit power of a cognitive radio device is controlled so that the cognitive, unlicensed radio device does not interfere with the use of a shared spectrum by a primary, licensed device. Controlling the transmit power includes determining a distance, or a function of the distance, between a primary transmitter of the primary device and the cognitive radio device based on sensing information from a spectrum sensing process. The maximum transmit power of the cognitive radio device is then dynamically controlled based on the distance, or the function of the distance, while considering a worst case scenario of an underlying cognitive radio model, to guarantee a quality of service requirement of the primary device.
摘要翻译：对于认知无线电系统，认知无线电设备的发射功率被控制，使得认知的，未许可的无线电设备不会干扰主要许可设备使用共享频谱。控制发射功率包括基于来自频谱感测过程的感测信息确定主设备的主发射机与认知无线电设备之间的距离或距离的函数。然后在考虑基础认知无线电模型的最坏情况的情况下，基于距离的距离或距离的函数来动态地控制认知无线电设备的最大发射功率，以保证主设备的服务质量要求。

3. 发明申请

US20090129496A1 FULL-RATE DISTRIBUTED SPACE-TIME CODES FOR COOPERATIVE COMMUNICATIONS 有权
标题翻译：用于合作通信的全速分配空间时间码
公开(公告)号：US20090129496A1
公开(公告)日：2009-05-21
申请号：US11941293
申请日：2007-11-16
申请人： Wei Zhang , Khaled Ben Letaief
发明人： Wei Zhang , Khaled Ben Letaief
IPC分类号： H04L27/28 , H04B7/14 , H04L5/12
CPC分类号： H04L25/03242 , H04B7/15592 , H04B7/2606 , H04L25/0248 , H04L2025/0342 , Y02D70/00 , Y02D70/446 , Y02D70/449
摘要： A full-rate distributed space-time (ST) code design is provided for amplify-and-forward cooperative wireless channels. A signal space diversity technique is employed at the source node and a unique signature vector at each relay node. The distributed space-time (ST) codes can achieve full cooperative diversity and full rate. The achievable diversity gain is M+1, where M is the number of relay nodes. Optimal power allocation can be used to maximize the coding gain under a total power constraint.
摘要翻译：提供全速率分布式时空（ST）码设计，用于放大和转发协作无线信道。在源节点采用信号空间分集技术，在每个中继节点采用唯一的签名向量。分布式时空（ST）码可以实现完全的协同分集和全速率。可实现的分集增益是M + 1，其中M是中继节点的数量。最佳功率分配可以用于在总功率约束下最大化编码增益。

4. 发明申请

US20080219222A1 OPTIMIZING DOWNLINK THROUGHPUT WITH USER COOPERATION AND SCHEDULING IN ADAPTIVE CELLULAR NETWORKS 有权
标题翻译：通过自适应细胞网络中的用户合作和调度优化下行链路
公开(公告)号：US20080219222A1
公开(公告)日：2008-09-11
申请号：US12037974
申请日：2008-02-27
申请人： Ernest Sze Yuen Lo , Khaled Ben Letaief
发明人： Ernest Sze Yuen Lo , Khaled Ben Letaief
IPC分类号： H04B7/212
CPC分类号： H04W72/1257 , H04B7/026 , H04B7/15542 , H04W40/22 , H04W88/04 , Y02D70/00 , Y02D70/1224 , Y02D70/1242 , Y02D70/39 , Y02D70/442 , Y02D70/446
摘要： User cooperation is an emerging transmission framework where users act as relays of each other to provide extra diversity paths for better overall performance. In various embodiments, systems and methods for transmitting data from a basestation to a mobile device in an adaptive communications network including user cooperation are provided. Among various embodiments, relaying is performed according to a time division duplex (TDD) system according to either a downlink-assisted relaying (DAR) which performs a relaying operation in a defined supplemental downlink timeslot or according to an uplink-assisted relaying (UAR) which performs a relaying operation in a defined supplemental uplink timeslot. Among other embodiments, relay transmissions according to a max-throughput scheduling algorithm which achieves a maximum system throughput without imposing any fairness constraints on users or according to a round-robin scheduling algorithm which achieves absolute fairness in terms of delays among the considered users. The downlink throughput is optimized from the basestation to the mobile device utilizing either amplify-and-forward (AF) or decode-and-forward (DF) cooperation protocols.
摘要翻译：用户合作是新兴的传输框架，其中用户作为彼此的中继，以提供额外的分集路径，以获得更好的整体性能。在各种实施例中，提供了在包括用户协作的自适应通信网络中从基站向移动设备发送数据的系统和方法。在各种实施例中，根据时分双工（TDD）系统，根据在定义的辅助下行链路时隙中执行中继操作的下行链路辅助中继（DAR）或者根据上行链路辅助中继（UAR）进行中继，其在定义的补充上行链路时隙中执行中继操作。在其他实施例中，根据最大吞吐量调度算法的中继传输，其实现最大系统吞吐量，而不对用户施加任何公平约束，或者根据循环调度算法，在所考虑的用户之间的延迟方面实现绝对公平。使用放大转发（AF）或解码转发（DF）协议协议，从基站到移动设备优化下行链路吞吐量。

5. 发明授权

US08774111B2 Fair and efficient channel allocation and spectrum sensing for cognitive OFDMA networks 失效
标题翻译：用于认知OFDMA网络的公平有效的信道分配和频谱感知
公开(公告)号：US08774111B2
公开(公告)日：2014-07-08
申请号：US13342839
申请日：2012-01-03
申请人： Chunhua Sun , Wei Chen , Khaled Ben Letaief
发明人： Chunhua Sun , Wei Chen , Khaled Ben Letaief
IPC分类号： H04W4/00
CPC分类号： H04W24/10 , H04W72/08
摘要： Systems, methods, and computer-readable media for a fair and efficient channel allocation and spectrum sensing for cognitive transmission in wireless networks are presented herein. A base station can send a cognitive user device a request to sense an idle channel associated with a primary network, and in response to receiving a willingness indicator or an attribute from the cognitive user device and/or a number of idle channels associated with the primary network sensed by the cognitive user device, the base station can assign the cognitive user device to transmit data on the idle channel associated with the primary network.
摘要翻译：本文介绍了用于无线网络中认知传输的公平有效的信道分配和频谱感测的系统，方法和计算机可读介质。基站可以向认知用户设备发送感知与主网络相关联的空闲信道的请求，并且响应于接收到来自认知用户设备的意愿指示符或属性和/或与主要网络相关联的多个空闲信道网络由认知用户设备感测到，基站可以分配认知用户设备在与主网络相关联的空闲信道上传输数据。

6. 发明授权

US08655283B2 Cluster-based cooperative spectrum sensing in cognitive radio systems 有权
标题翻译：认知无线电系统中基于簇的协作频谱感知
公开(公告)号：US08655283B2
公开(公告)日：2014-02-18
申请号：US12062590
申请日：2008-04-04
申请人： Chunhua Sun , Wei Zhang , Khaled Ben Letaief
发明人： Chunhua Sun , Wei Zhang , Khaled Ben Letaief
IPC分类号： H04B17/00
CPC分类号： H04W16/14 , H04W84/18
摘要： Cluster-based cooperative spectrum sensing is provided for cognitive radio systems. For each cluster of cognitive users, a cluster head is determined. Each cluster head collects energies of a reporting channel measured by the cognitive users within the cluster and decides whether a primary user is absent from a given spectrum. A common receiver then aggregates the cluster-level decisions made by the cluster heads, and makes a decision across multiple, or all of, the clusters whether the primary user is absent based on a fusion function of the cluster-level decisions. If the primary (licensed) user is absent, then secondary (unlicensed) users may utilize the spectrum.
摘要翻译：为认知无线电系统提供基于簇的协作频谱感知。对于每个认知用户集群，确定集群头。每个簇头收集由群集内的认知用户测量的报告信道的能量，并且确定主用户是否不在给定的频谱中。然后，公共接收器聚合由簇头做出的集群级决策，并且基于聚类级别决策的融合功能，通过多个或全部群集来决定主用户是否不存在。如果主（许可）用户不存在，则次要（未许可）用户可以利用频谱。

7. 发明授权

US08315663B2 Power control in cognitive radio systems based on spectrum sensing side information 有权
标题翻译：基于频谱感知侧信息的认知无线电系统中的功率控制
公开(公告)号：US08315663B2
公开(公告)日：2012-11-20
申请号：US13223120
申请日：2011-08-31
申请人： Karama Hamdi , Wei Zhang , Khaled Ben Letaief
发明人： Karama Hamdi , Wei Zhang , Khaled Ben Letaief
IPC分类号： H04W52/24
CPC分类号： H04W52/26 , H04W16/14 , H04W52/242 , H04W52/243 , H04W52/246 , H04W52/265 , H04W52/283 , H04W64/00
摘要： For cognitive radio systems, the transmit power of a cognitive radio device is controlled so that the cognitive, unlicensed radio device does not interfere with the use of a shared spectrum by a primary, licensed device. Controlling the transmit power includes determining a distance, or a function of the distance, between a primary transmitter of the primary device and the cognitive radio device based on sensing information from a spectrum sensing process. The maximum transmit power of the cognitive radio device is then dynamically controlled based on the distance, or the function of the distance, while considering a worst case scenario of an underlying cognitive radio model, to guarantee a quality of service requirement of the primary device.
摘要翻译：对于认知无线电系统，认知无线电设备的发射功率被控制，使得认知的，未许可的无线电设备不会干扰主要许可设备使用共享频谱。控制发射功率包括基于来自频谱感测过程的感测信息确定主设备的主发射机与认知无线电设备之间的距离或距离的函数。然后在考虑基础认知无线电模型的最坏情况的情况下，基于距离的距离或距离的函数来动态地控制认知无线电设备的最大发射功率，以保证主设备的服务质量要求。

8. 发明申请

US20090086706A1 CROSS-LAYER MULTI-PACKET RECEPTION BASED MEDIUM ACCESS CONTROL AND RESOURCE ALLOCATION 审中-公开
标题翻译：跨层多媒体接收基于中访问控制和资源分配
公开(公告)号：US20090086706A1
公开(公告)日：2009-04-02
申请号：US11865477
申请日：2007-10-01
申请人： Weilan Huang , Khaled Ben Letaief
发明人： Weilan Huang , Khaled Ben Letaief
IPC分类号： H04J3/24 , H04L12/413
CPC分类号： H04L12/417 , H04L1/0003 , H04L1/0026 , H04L1/0643 , H04W28/18 , H04W72/04 , H04W74/004 , H04W74/006 , H04W74/0808 , H04W74/085 , H04W74/0866
摘要： A cross-layer multi-packet reception media access control and resource allocation technique is provided for wireless networks having receivers with multiple antennas. User devices on the wireless network access the network for data transmission by making a request to send (RTS) request after a random backoff time. In response to a request to send, an access point (or other receiver) determines transmission parameters that optimize the use of the physical layer based at least in part on channel state information. Those transmission parameters are transmitted along with a clear to send (CTS) message from the receiver to an indicated transmitter. Once the CTS message is received, data is transmitted in accordance with transmission parameters.
摘要翻译：为具有多个天线的接收机的无线网络提供跨层多分组接收媒体接入控制和资源分配技术。无线网络上的用户设备通过在随机退避时间之后发出请求（RTS）请求来访问网络进行数据传输。响应于发送请求，接入点（或其他接收机）至少部分地基于信道状态信息确定优化物理层的使用的传输参数。这些传输参数与从接收机到指定发射机的清晰发送（CTS）消息一起发送。一旦接收到CTS消息，就根据传输参数传输数据。

9. 发明授权

US5960032A High speed data transmission using expanded bit durations in multiple parallel coded data streams 失效
标题翻译：在多个并行编码数据流中使用扩展位持续时间的高速数据传输
公开(公告)号：US5960032A
公开(公告)日：1999-09-28
申请号：US531012
申请日：1995-09-20
申请人： Khaled Ben Letaief , Justin C-I Chuang , Ross D. Murch
发明人： Khaled Ben Letaief , Justin C-I Chuang , Ross D. Murch
IPC分类号： H04B1/707 , H04B7/005 , H04B7/26
CPC分类号： H04W52/42 , H04B1/707 , H04B7/264
摘要： High-rate bit transmitted data is serial to parallel converted into low-rate bit streams in a similar fashion to multicarrier or multitone modulation. However, in contrast to the multicarrier method, each low-rate bit stream is modulated using direct-sequence spread-spectrum. By selecting the processing gain properly the total required bandwidth will be of the same order as the original high-rate data stream, thereby gaining the inherent benefit of multipath rejection without expanding the bandwidth of the original high-rate stream.
摘要翻译：高速率位传输的数据是串行的，以与多载波或多音调制相似的方式并行地转换成低速比特流。然而，与多载波方法相反，使用直接序列扩频调制每个低速比特流。通过正确选择处理增益，总需要的带宽将与原始高速率数据流的顺序相同，从而获得多路径抑制的固有优点，而不会扩展原始高速率流的带宽。

10. 发明授权

US08792500B2 Multiuser scheduling for MIMO broadcast channels with finite rate feedback 有权
标题翻译：具有有限速率反馈的MIMO广播信道的多用户调度
公开(公告)号：US08792500B2
公开(公告)日：2014-07-29
申请号：US13240219
申请日：2011-09-22
申请人： Wei Zhang , Khaled Ben Letaief
发明人： Wei Zhang , Khaled Ben Letaief
IPC分类号： H04L12/28
CPC分类号： H04B7/0697 , H04B7/0452 , H04B7/061 , H04B7/0632 , H04B7/0691 , H04B7/0805
摘要： System and methodologies are provided herein for multiuser scheduling in a multiple-input multiple-output (MIMO) communication system. Various aspects described herein facilitate full feedback scheduling, wherein multiuser scheduling is performed based on an antenna selection and signal quality feedback, such as signal-to-interference-plus-noise ratio (SINR) feedback, from respective users. Based on information received from respective users, independent information streams can be transmitted from respective transmit antennas to respective users with the highest signal quality. Receive antenna selection can also be employed to allow respective users to select a single receive antenna on which information is to be received. Additional aspects described herein facilitate quantized feedback scheduling, wherein scheduling is performed based on signal quality feedback that is quantized into a finite number of bits by respective users.
摘要翻译：本文提供了用于多输入多输出（MIMO）通信系统中的多用户调度的系统和方法。这里描述的各个方面促进全反馈调度，其中基于来自相应用户的天线选择和信号质量反馈（例如信号与干扰加噪声比（SINR）反馈）来执行多用户调度。基于从各个用户接收的信息，可以将独立的信息流从各个发送天线发送到具有最高信号质量的各个用户。还可以采用接收天线选择以允许各个用户选择要在其上接收信息的单个接收天线。本文描述的附加方面有助于量化的反馈调度，其中基于由相应用户量化为有限位数的信号质量反馈来执行调度。

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