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    • 12. 发明申请
    • POWER CONTROL AND SCHEDULING IN AN OFDM SYSTEM
    • OFDM系统中的功率控制和调度
    • WO2004105294A3
    • 2005-04-28
    • PCT/US2004015172
    • 2004-05-14
    • QUALCOMM INCNAGUIB AYMAN FAWZYAGRAWAL AVNEESHSUTIVONG ARAK
    • NAGUIB AYMAN FAWZYAGRAWAL AVNEESHSUTIVONG ARAK
    • G01R31/08H04B7/005H04L20060101H04L27/26
    • H04W52/24H04L5/0007H04L5/0044H04L5/0058H04L5/006
    • A system and method for power control and scheduling of sub-carriers in an OFDM communication system. The receiver dynamic range can be minimized by a power control loop that attempts to maintain received power over a noise floor in a predetermined range. If the received power relative to a noise floor in allocated sub-carriers exceeds the predetermined range and the total received power is at the minimum, the scheduling system allocates an additional sub-carrier to the communication link. Additionally, if the received power relative to the noise floor is less than the predetermined range minimum, and the total received power is at a maximum, the scheduling system de-allocates a sub-carrier from the communication link. The scheduling system may also adjust an encoding rate to maintain a relatively constant symbol rate in each sub-carrier.
    • 一种用于OFDM通信系统中的子载波的功率控制和调度的系统和方法。 接收器动态范围可以通过功率控制回路最小化,该功率控制环路试图在预定范围内将接收功率保持在噪声基底上。 如果分配的子载波中相对于本底噪声的接收功率超过预定范围并且总接收功率处于最小值,则调度系统向通信链路分配附加子载波。 此外,如果相对于本底噪声的接收功率小于预定范围最小值,并且总接收功率处于最大值,则调度系统从通信链路去分配子载波。 调度系统还可以调整编码速率以在每个子载波中维持相对恒定的符号率。
    • 17. 发明申请
    • SENSOR NETWORKS BASED ON WIRELESS DEVICES
    • 基于无线设备的传感器网络
    • WO2008039872A8
    • 2009-04-23
    • PCT/US2007079597
    • 2007-09-26
    • QUALCOMM INCNANDA SANJIVAGRAWAL AVNEESH
    • NANDA SANJIVAGRAWAL AVNEESH
    • H04W16/14H04W24/00H04W24/10H04W84/18
    • G01D21/00G01S5/0009H04W16/14H04W24/00H04W24/10H04W84/18
    • Techniques for using wireless devices to implement sensor networks are described. For cognitive radio, a wireless device obtains measurements for a first system (e.g., a broadcast system) with which the wireless device is not in communication. The wireless device sends the measurements and associated location information and/or timestamps via a second system (e.g., a cellular system). A server receives measurements from a number of wireless devices and determines the coverage of the first system based on the measurements. For other applications, a wireless device obtains sensor information from at least one sensor at the wireless device and sends the sensor information and associated location information and/or timestamps via a wireless system. A server receives the sensor information and associated information from a number of wireless devices, aggregates the sensor information, and constructs a map. The wireless device may develop a user profile based on the sensor information and associated information.
    • 描述了使用无线设备来实现传感器网络的技术。 对于认知无线电,无线设备获得与无线设备不在通信的第一系统(例如,广播系统)的测量。 无线设备经由第二系统(例如,蜂窝系统)发送测量和相关联的位置信息和/或时间戳。 服务器从多个无线设备接收测量值,并根据测量结果确定第一系统的覆盖范围。 对于其他应用,无线设备从无线设备处的至少一个传感器获取传感器信息,并且经由无线系统发送传感器信息和相关联的位置信息和/或时间戳。 服务器从多个无线设备接收传感器信息和关联信息,聚合传感器信息,并构建一个映射。 无线设备可以基于传感器信息和相关信息来开发用户简档。
    • 18. 发明申请
    • PILOT TRANSMISSION AND CHANNEL ESTIMATION WITH PILOT WEIGHTING
    • 飞行员称重的飞行传输和通道估计
    • WO2006124810A3
    • 2009-04-16
    • PCT/US2006018789
    • 2006-05-16
    • QUALCOMM INCGORE DHANANJAY ASHOKAGRAWAL AVNEESH
    • GORE DHANANJAY ASHOKAGRAWAL AVNEESH
    • H04J11/00
    • H04B1/69H04L5/0007H04L5/0048H04L25/0226H04L25/0232H04L27/2647
    • Techniques to perform channel estimation with pilot weighting are described (Fig 5B). A receiver receives at least one transmission symbol for a pilot transmitted by a transmitter. Each transmission symbol may be generated with a single-carrier multiplexing scheme (e.g., IFDMA or LFDMA) or a multi-carrier multiplexing scheme (e.g., OFDMA). The receiver processes each received transmission symbol and obtains received pilot values (562). The receiver may derive an interference estimate based on the received pilot values and may estimate the reliability of the received pilot values based on the interference estimate (564). The receiver determines weights for the received pilot values based on the transmitted pilot values, the estimated reliability of the received pilot values, and/or other information (568). The receiver derives a channel estimate based on the received pilot values and the weights (570). The receiver then performs data detection (e.g., equalization) on received data values with the channel estimate (572).
    • 描述用导频加权来执行信道估计的技术(图5B)。 接收机接收由发射机发送的导频的至少一个传输符号。 可以使用单载波复用方案(例如,IFDMA或LFDMA)或多载波复用方案(例如,OFDMA)生成每个传输符号。 接收机处理每个接收到的传输符号并获得接收到的导频值(562)。 接收机可以基于接收到的导频值导出干扰估计,并且可以基于干扰估计来估计接收到的导频值的可靠性(564)。 接收机基于发送的导频值,接收到的导频值的估计可靠性和/或其他信息来确定接收到的导频值的权重(568)。 接收器基于接收到的导频值和权重导出信道估计(570)。 然后,接收机对具有信道估计的接收数据值执行数据检测(例如,均衡)(572)。
    • 19. 发明申请
    • ADAPTIVE DISTRIBUTED FREQUENCY PLANNING
    • 自适应分布式频率规划
    • WO2008157799A2
    • 2008-12-24
    • PCT/US2008067756
    • 2008-06-20
    • QUALCOMM INCGOROKHOV ALEXEIAGRAWAL AVNEESHBHUSHAN NAGAJI TINGFANG
    • GOROKHOV ALEXEIAGRAWAL AVNEESHBHUSHAN NAGAJI TINGFANG
    • H04W16/04H04L1/0026
    • Systems and methodologies are described that facilitate employing distributed frequency planning and reuse factor optimization based upon forward link and/or reverse link interference management techniques. An optimal reuse factor for a base station can be determined based upon a metric that evaluates levels of service associated with neighboring base stations. Moreover, a subset of available resource sets can be selected for use by the base station; thus, a base station specific collection of resource sets can be formed through such selection. Further, mappings of each resource set to a set of physical resources can be disseminated in a network or portion thereof. According to another example, frequency hopping can be constrained to use of resources within a resource set (rather than across more than one resource set) as provided in a base station specific hopping pattern.
    • 描述了有助于采用基于前向链路和/或反向链路干扰管理技术的分布式频率规划和重用因子优化的系统和方法。 可以基于评估与相邻基站相关联的服务等级的度量来确定基站的最佳重用因子。 此外,可以选择可用资源集的子集供基站使用; 因此,可以通过这样的选择来形成基站特定资源集合。 此外,每个资源集合对一组物理资源的映射可以在网络或其一部分中传播。 根据另一示例,跳频可以被限制为使用资源集合(而不是跨越多于一个资源集合)的资源,如在基站特定跳频模式中所提供的。