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    • 1. 发明申请
    • LAYERED CODING FOR SATELLITE PROPAGATION CHANNELS
    • 卫星传播通道的层次编码
    • WO2008076555A3
    • 2008-11-27
    • PCT/US2007084651
    • 2007-11-14
    • QUALCOMM INCJALALI AHMAD
    • JALALI AHMAD
    • H04B7/185
    • H04L5/0007H04B7/18508H04B7/18536H04B7/2628H04B2201/709709H04H40/90H04L1/0045H04L1/007H04L1/0086H04L1/08H04L65/601H04L2001/0097H04N21/2343H04N21/2383H04N21/2662H04N21/6143H04N21/631
    • An original data stream is encoded into a high priority data stream and a low priority data stream. The high priority data stream is encoded so as to permit decoding of the high priority data steam independently of the low priority data stream. The high priority data stream is transmitted twice, while the low priority is transmitted in two portions, but only once. If both the first portion and the second portion of the low priority data stream are received, and at least one complete transmission of the high priority data stream is received, then the two data streams are combined to "produce a signal output of high quality. However, if any portions of the low priority data stream is lost' then the low priority data stream is not used, and only the high priority data stream is used to produce output. Overall throughput is greater than would be achieved if the original data stream were transmitted with complete redundancy.
    • 原始数据流被编码为高优先级数据流和低优先级数据流。 对高优先级数据流进行编码,以便能够独立于低优先级数据流解码高优先级数据流。 高优先级数据流被发送两次,而低优先级被传送两部分,但只传输一次。 如果接收到低优先级数据流的第一部分和第二部分,并且接收到高优先级数据流的至少一个完整传输,则两个数据流被组合以“产生高质量的信号输出。 然而,如果低优先级数据流的任何部分丢失“,则不使用低优先级数据流,并且仅使用高优先级数据流来产生输出。总吞吐量大于如果原始数据流 完全冗余传输。
    • 4. 发明申请
    • LOCATION-BASED SERVICES PROVIDED VIA UNMANNED AERIAL VEHICLES (UAVs)
    • 无人机(UAV)提供的基于位置的服务
    • WO2015175054A3
    • 2016-01-28
    • PCT/US2015016062
    • 2015-02-16
    • JALALI AHMAD
    • JALALI AHMAD
    • G08G1/123
    • H04W4/046G01S5/02G01S5/14G01S13/876G06Q10/0833H04B7/18502H04W64/003
    • An automated method of determining a location of an aerial platform is described. The method includes: transmitting, from the aerial platform, a first pilot signal; receiving, at a set of ground devices, the first pilot signal; determining a first set of values based on measurements associated with the first pilot signal; and calculating a position of the aerial platform based at least partly on the first set of values. An automated method adapted to determine a location of a ground device includes: transmitting, from the ground device, a first pilot signal; receiving, at each aerial platform in a set of aerial platforms, the first pilot signal; determining a first set of values based on measurements associated with the first pilot signal; and calculating a position of the ground device based at least partly on the first set of values. A system adapted to provide location information is described.
    • 描述了一种确定空中平台位置的自动化方法。 该方法包括:从空中平台发送第一导频信号; 在一组地面装置处接收第一导频信号; 基于与所述第一导频信号相关联的测量来确定第一组值; 以及至少部分地基于所述第一组值来计算所述空中平台的位置。 适于确定接地设备的位置的自动化方法包括:从地面设备发送第一导频信号; 在一组高空作业平台中的每个空中平台处接收第一导频信号; 基于与所述第一导频信号相关联的测量来确定第一组值; 以及至少部分地基于所述第一组值来计算所述地面设备的位置。 描述适于提供位置信息的系统。
    • 9. 发明申请
    • IMPROVEMENTS TO A WIRELESS INTERFACE TO ENABLE COMMUNICATIONS VIA A SATELLITE RELAY
    • 改善无线接口,通过卫星接收器实现通信
    • WO2008014520A3
    • 2008-03-20
    • PCT/US2007074767
    • 2007-07-30
    • QUALCOMM INCKUPPUSWAMY KALYANNAMGOONG JUNEJAYARAMAN SRIKANTJALALI AHMAD
    • KUPPUSWAMY KALYANNAMGOONG JUNEJAYARAMAN SRIKANTJALALI AHMAD
    • H04L29/06H04B7/185
    • H04B7/18567
    • A communication system is provided that allows a mobile terminal with an EVDO interface to perform VoIP communications via a satellite. The 1xEVDO physical layer frames and vocoder frames are synchronized and aligned to a known periodic time boundary for efficient transmission. A reverse link transmission rate is adjusted to match a VoIP packet source rate and operate the reverse link transmission channel to a satellite continuously. The reverse link transmission channel from a mobile terminal to a satellite may operate continuously and at a lower channel transmission rate to reduce the peak power amplifier power requirement. The higher layer time-out periods are increased to account for propagation delay to/from a satellite relay. A physical layer retransmit mechanism is disabled to ignore ACKs/ NACKs when sending VoIP packets via a satellite relay. A different channel code may be selective applied depending on the size/type of packets being transmitted.
    • 提供一种通信系统,其允许具有EVDO接口的移动终端经由卫星执行VoIP通信。 1xEVDO物理层帧和声码器帧被同步并对齐到已知的周期时间边界以进行有效传输。 调整反向链路传输速率以匹配VoIP分组源速率并且连续地向卫星操作反向链路传输信道。 从移动终端到卫星的反向链路传输信道可以连续地以较低的信道传输速率工作,以降低峰值功率放大器的功率需求。 更高层的超时周期被增加以考虑到/从卫星中继的传播延迟。 当通过卫星中继发送VoIP分组时,物理层重传机制被禁止忽略ACK / NACK。 根据发送的分组的大小/类型,可以选择性地应用不同的信道码。