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    • 2. 发明授权
    • Power control and cell site location technique for CDMA systems with hierarchical architecture
    • 具有层次结构的CDMA系统的功率控制和小区站点定位技术
    • US06438379B1
    • 2002-08-20
    • US09322941
    • 1999-05-28
    • Richard Dennis GitlinHoward C. HuangRajeev KrishnamoorthyReinaldo A. Valenzuela
    • Richard Dennis GitlinHoward C. HuangRajeev KrishnamoorthyReinaldo A. Valenzuela
    • H04Q736
    • H04W52/343H04W16/06H04W16/32H04W52/346
    • Multiple microcell base stations are located within a macrocell having single macrocell base station in an hierarchical architecture, and microcell users (&mgr;-users) and macrocell users (M-users) communicate respectively with the &mgr;-base and the M-base using the same frequency band, by appropriately (a) selecting the ratio of the radius r of each &mgr; cell and the average distance d from the M-base (r and d are measured by the “radio distance”, which includes the effects of shadowing), and (b) controlling the power level with which uplink (mobile to base) and downlink (base to mobile) messages are communicated. Typically, &mgr;-cell size and location are chosen such that d/r>10. With respect to uplink communications, the transmit powers of the &mgr;-users in a &mgr;-cell are controlled so that the total received power at the nearest M-base is equivalent to the received power from C M-users, where C is usually set to unity. As a result, the M-cell basically loses C users worth of capacity, but the total number of users is increased by virtue of the additional &mgr;-users. With respect to downlink communications, as long as the microbase and the macrobase are coordinated systems, the &mgr;-base transmit power is controlled so that at the point of handoff between a &mgr;-base and M-base, the received power at a user from the two bases is equivalent, and the received power at the bases from this user is also equivalent. With this arrangement, the &mgr;-base transmit power is increased as r grows and d decreases in order for this balance to occur. Where the M-base and &mgr;-base have no knowledge of each other and handoffs are not allowed between the two base types, a family of I/Q short codes which are quasi-orthogonal to the existing short (pilot) codes are generated, and these codes are used to distinguish between the M-base and &mgr;-base signals.
    • 多个微小区基站位于具有分层架构的单个宏小区基站的宏小区内,并且微小区用户(mu用户)和宏小区用户(M用户)分别与使用相同的基站和M基站进行通信 通过适当地(a)选择每个mu单元的半径r与来自M基的平均距离d(r和d由“无线电距离”测量,包括阴影效应)的比率, 和(b)控制通信的上行链路(移动台到基站)和下行链路(基站到移动)消息的功率电平。 通常,选择mu单元格大小和位置使得d / r> 10。 对于上行链路通信,mu单元中的mu用户的发送功率被控制,使得最接近的M-base处的总接收功率等于来自C M用户的接收功率,其中C通常设置 团结 结果,M-cell基本上损失了C用户的容量,但是由于其他的mu用户,用户总数增加了。 对于下行链路通信,只要微基站和宏基站是协调系统,则控制mu基发射功率,使得在mu基和M基之间的切换点处,用户的接收功率 两个基地是等效的,并且从该用户的基地接收的功率也是等效的。 通过这种布置,随着r增长,mu基传输功率增加,d减小,以使得该平衡发生。 在M基和mu基不相互之间,两基类之间不允许切换的情况下,产生与现有短(导频)码准正交的一系列I / Q短码, 这些码用于区分M基和M基信号。
    • 8. 发明申请
    • CHANNEL INFORMATION FEEDBACK REDUCTION IN COMMUNICATION NETWORK
    • 通信信息反馈减少通信网络
    • US20120196607A1
    • 2012-08-02
    • US13017304
    • 2011-01-31
    • Dragan SamardzijaTheodore SizerReinaldo A. Valenzuela
    • Dragan SamardzijaTheodore SizerReinaldo A. Valenzuela
    • H04W72/04
    • H04J11/0053H04B7/024H04B7/0626H04B7/0658H04L5/0035H04L5/0039
    • Techniques are disclosed for reducing channel information feedback in communication networks. For example, a method comprises the following steps. A set of mobile terminals and a set of base stations designated to participate in a coordinated multipoint transmission protocol in a communication network are identified. One or more unique downlink communication resource blocks are assigned to each designated mobile terminal that is located in a given first sector of a designated base station. As such, each designated mobile terminal in the first sector of the designated base station: (i) performs a channel state estimation process in response to respective signals received from the designated base stations in the one or more unique downlink communication resource blocks assigned to that designated mobile terminal; and (ii) transmits resulting channel state information back to at least one of the designated base stations.
    • 公开了用于减少通信网络中的信道信息反馈的技术。 例如,一种方法包括以下步骤。 识别一组移动终端和指定为参与通信网络中的协调多点传输协议的一组基站。 一个或多个唯一的下行链路通信资源块被分配给位于指定基站的给定第一扇区中的每个指定的移动终端。 这样,指定基站的第一扇区中的每个指定的移动终端:(i)响应于从分配给该基站的一个或多个唯一下行链路通信资源块中从指定的基站接收到的相应信号来执行信道状态估计处理 指定移动终端; 和(ii)将所生成的信道状态信息发送回指定的基站中的至少一个。
    • 9. 发明授权
    • Method and system employing antenna arrays
    • 采用天线阵列的方法和系统
    • US07421039B2
    • 2008-09-02
    • US10160126
    • 2002-06-04
    • Laurence Eugene MalaenderReinaldo A. Valenzuela
    • Laurence Eugene MalaenderReinaldo A. Valenzuela
    • H04L27/12H04L7/02
    • H04B7/0413H04L1/0001H04W52/26H04W52/42
    • In the method and system, a transmitter demultiplexes an input data stream into M substreams, where each of the M substreams have a data rate lower than a data rate of the input data stream. The substreams are transmitted as signals from a transmit array of M antennas to be received by a receiver array at a receiver in the system, based on a set of transmission parameters. The transmitter adjusts at least one of the transmission parameters based on a condition experienced by the receiver so as to increase data throughput in the system. The adjustable parameters include the number of antennas to employ, the on/off patterns for the antennas, and eigenmode values for the antennas used in order to determine transmit power. Accordingly, system data throughput may be improved while maintaining transmit power and system bandwidth constant.
    • 在该方法和系统中,发射机将输入数据流解复用为M个子流,其中每个M个子流具有低于输入数据流的数据速率的数据速率。 基于一组传输参数,子流作为来自M个天线的发射阵列的信号被传输以由系统中的接收机处的接收器阵列接收。 发射机根据接收机所经历的状况来调整传输参数中的至少一个,以增加系统中的数据吞吐量。 可调节的参数包括要使用的天线数量,天线的开/关模式以及用于确定发射功率的天线的本征模式值。 因此,可以在维持发射功率和系统带宽恒定的同时提高系统数据吞吐量。