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    • 4. 发明申请
    • FAST FREQUENCY HOPPING WITH A CODE DIVISION MULTIPLEXED PILOT IN AN OFDMA SYSTEM
    • 在OFDMA系统中使用代码段多路复用引导器进行快速频率搜索
    • WO2004102816A2
    • 2004-11-25
    • PCT/US2004/014453
    • 2004-05-07
    • QUALCOMM INCORPORATEDAGRAWAL, AvneeshTEAGUE, Edward, Harrison
    • AGRAWAL, AvneeshTEAGUE, Edward, Harrison
    • H04B
    • H04L27/2613H04B1/713H04B2201/70701H04L5/0007H04L5/0016H04L5/0041H04L5/0051H04L25/0232H04L25/03866H04L27/2647H04L2025/03414H04L2025/03509H04L2025/03789
    • Techniques are provided to support fast frequency hopping with a code division multiplexed (CDM) pilot in a multi-carrier communication system (e.g., an OFDMA system). Each transmitter (e.g., each terminal) in the system transmits a wideband pilot on all subbands to allow a receiver (e.g., a base station) to estimate the entire channel response at the same time. The wideband pilot for each transmitter may be generated using direct sequence spread spectrum processing and based on a pseudo-random number (PN) code assigned to that transmitter. This allows the receiver to individually identify and recover multiple wideband pilots transmitted concurrently by multiple transmitters. For a time division multiplexed (TDM)/CDM pilot transmission scheme, each transmitter transmits the wideband pilot in bursts. For a continuous CDM pilot transmission scheme, each transmitter continuously transmits the wideband pilot, albeit at a low transmit power level. Any frequency hopping rate may be supported without impacting pilot overhead.
    • 提供技术以在多载波通信系统(例如,OFDMA系统)中用码分多路复用(CDM)导频来支持快速跳频。 系统中的每个发射机(例如,每个终端)在所有子带上发送宽带导频,以允许接收机(例如,基站)同时估计整个信道响应。 可以使用直接序列扩频处理并基于分配给该发射机的伪随机数(PN)码来生成每个发射机的宽带导频。 这允许接收机单独地识别和恢复由多个发射机同时传输的多个宽带导频。 对于时分复用(TDM)/ CDM导频传输方案,每个发射机以突发方式发送宽带导频。 对于连续的CDM导频传输方案,每个发射机连续发射宽带导频,尽管传输功率水平较低。 可以支持任何跳频率,而不会影响导频开销。
    • 7. 发明申请
    • SOFT HANDOFF FOR REVERSE LINK IN A WIRELESS COMMUNICATION SYSTEM WITH FREQUENCY REUSE
    • 在无线通信系统中进行反向链路的软交换
    • WO2005122628A1
    • 2005-12-22
    • PCT/US2005/020180
    • 2005-06-08
    • QUALCOMM INCORPORATEDAGRAWAL, AvneeshTEAGUE, Edward, HarrisonJI, Tingfang
    • AGRAWAL, AvneeshTEAGUE, Edward, HarrisonJI, Tingfang
    • H04Q7/38
    • H04W36/18H04W36/06
    • For soft handoff on the reverse link with restrictive reuse, a wireless terminal searches for pilots transmitted by sectors in a wireless system, measures the detected pilots, selects a serving sector (e.g., the strongest received sector), and identifies non-serving sectors that may receive high interference from the terminal. The serving sector assigns the terminal with subband(s) that are usable by the serving sector and unusable by the non-serving sectors. The terminal transmits data symbols on the assigned subbands to the serving and non-serving sectors. These sectors process the reverse link transmission from the terminal and obtain soft-decision symbols, which are estimates of the transmitted data symbols. The soft-decision symbols from co-located sectors may be combined and then decoded to obtain decoded packets. The sectors may also independently decode the soft-decision symbols, and the decoded packets from these sectors may be combined to obtain final decoded packets for the terminal.
    • 对于具有限制性重用的反向链路上的软切换,无线终端搜索无线系统中的扇区传输的导频,测量检测到的导频,选择服务扇区(例如,最强的接收扇区),并识别非服务扇区 可能会受到来自终端的高干扰。 服务扇区向终端分配可由服务扇区使用且不能由非服务扇区使用的子带。 终端将分配的子带上的数据符号发送到服务扇区和非服务扇区。 这些扇区处理来自终端的反向链路传输,并获得作为发送数据符号的估计的软判决符号。 可以组合来自同位置扇区的软判决符号,然后对其进行解码以获得解码的分组。 这些扇区还可以独立地解码软判决符号,并且可以组合来自这些扇区的解码分组以获得终端的最终解码分组。