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    • 50. 发明申请
    • Fast Frequency Hopping With a Code Division Multiplexed Pilot in an OFDMA System
    • 在OFDMA系统中使用码分多路复用导频进行快速跳频
    • US20070211790A1
    • 2007-09-13
    • US11614470
    • 2006-12-21
    • Avneesh AgrawalEdward Teague
    • Avneesh AgrawalEdward Teague
    • H04B1/00
    • 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。