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    • 3. 发明公开
    • Cognative radio communication method
    • Kommunikationsverfahrenfürkognitive Funktechnik
    • EP2378731A2
    • 2011-10-19
    • EP11161812.0
    • 2011-04-11
    • General Electric Company
    • Hartman, Michael JamesHershey, John ErikZinser, Richard LouisRoss, John Anderson FergusDell'anno, Michael J
    • H04L27/00
    • H04L27/0006H04L5/1423H04L5/1461
    • Provided are methods and systems of using division-free duplexing (DFD)(98) to reduce rendezvous time between two or more cognitive radio devices (14, 16). The cognitive radio devices (14, 16) may opportunistically use available frequency spectra by communicating over available channels. To communicate, a first device (14) may rendezvous with a second device (16) by transmitting (94) a beaconing signal (64, 74, 84) over a frequency on which the second device (16) is listening (96). DFD techniques (98) may enable each of the devices (14, 16) to listen to a channel while concurrently transmitting (94) beacon signals over the same channel. As periods of listening (62, 72, 82) and periods of transmitting (66, 76, 86) over the same channel need not be separated due to the transmitter cancelling approach (20) used in DFD techniques, rendezvous time may be significantly reduced. Further, embodiments include a generalized DFD (GDFD) approach wherein devices listen to a broad band of frequencies, thus further reducing rendezvous time.
    • 提供了使用无分割双工(DFD)(98)来减少两个或更多个认知无线电设备(14,16)之间的会合时间的方法和系统。 认知无线电设备(14,16)可以通过在可用信道上通信来机会地使用可用的频谱。 为了通信,第一设备(14)可以通过在第二设备(16)正在监听的频率(96)上发送(94)信标信号(94,74,84)来与第二设备(16)会合。 DFD技术(98)可以使得每个设备(14,16)能够在同一信道上同时传输(94)信标信号的同时监听信道。 由于在DFD技术中使用的发射机消除方法(20),在同一信道上的收听周期(62,72,82)和发射周期(66,76,86)不需要分离,所以会合时间可能显着降低 。 此外,实施例包括广义DFD(GDFD)方法,其中设备收听宽频带,从而进一步减少会合时间。