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    • 4. 发明申请
    • METHOD AND APPARATUS FOR CHANGING THE TYPE OF MODULATION
    • 改变调制类型的方法和装置
    • WO2006071413A1
    • 2006-07-06
    • PCT/US2005/042543
    • 2005-11-22
    • MOTOROLA, INC.NETSELL, Aaron, W.PEPLINSKI, Neil, R.
    • NETSELL, Aaron, W.PEPLINSKI, Neil, R.
    • H04L27/00
    • H04L27/0008
    • A block edge detector (310) determines whether a wireless communication transmission with a first modulation having excess spectral emissions will be transmitted at a frequency on a block edge. In response, a modulator selector (320) changes the wireless communication transmission to a second modulation with lessened spectral emissions. Preferably, the second modulator (340) is operably coupled to an alternative lookup table (360) wherein phase trajectory entries likely to cause excess spectral emissions such as spurious emissions are smoothed. The entries may be smoothed by filtering, non-linear extrapolation, and/or linear extrapolation. Alternatively, the second modulator (340) uses an alternative lookup table (360) that is a GMSK modulator with BT less than 0.3.
    • 块边缘检测器(310)确定具有超频谱发射的具有第一调制的无线通信传输是否将以块边缘上的频率发送。 作为响应,调制器选择器(320)将无线通信传输改变为具有减小的频谱发射的第二调制。 优选地,第二调制器(340)可操作地耦合到替代查找表(360),其中可能导致过量频谱发射(例如杂散发射)的相位轨迹条目被平滑。 条目可以通过滤波,非线性外插和/或线性外推来平滑。 或者,第二调制器(340)使用作为BT小于0.3的GMSK调制器的替代查找表(360)。