公开(公告)号：WO03003627A9

公开(公告)日：2003-04-10

申请号：PCT/US0220014

申请日：2002-06-24

Applicant: HARRIS BROADBAND WIRELESS ACCE

Inventor： DWORNIK GLEN A

IPC: H04B1/46 ,  H04L12/28 ,  H04H1/04 ,  H04H1/00 ,  H04J1/00

CPC classification number: H04L12/2856 ,  H04B1/46

Abstract: The present invention relates to a method and apparatus for selectively enabling and disabling transmit and receive functions of a radio (figure 1A), and more particularly to a system and method utilizing an out-of-band signal over a time division duplex channel to control transmit (11) and receive (12) functions of a radio so as to synchronize with the functions of a remote modem (figure 2, 40). The invention relates to a system and method for synchronizing the transmit and receive modes of a radio via an out of band signal. The out of band signal is preferably a control tone at a predetermined frequency and is substantially coextensive with the communication signal to be transmitted. The radio filters a multiplexed signal and detects if the control tone is present. If the control tone is not detected, the radio preferably remains in the default receive mode. If the control tone is detected, the radio operates in the transmit mode for the duration of the control signal.

Abstract translation: 本发明涉及用于选择性地启用和禁用无线电的发送和接收功能的方法和设备（图1A），并且更具体地涉及利用时分双工信道上的带外信号来控制 传输（11）和接收（12）无线电功能，以便与远程调制解调器的功能同步（图2,40）。 本发明涉及一种通过带外信号同步无线电的发射和接收模式的系统和方法。 带外信号优选是预定频率的控制音，并且与要传输的通信信号基本上共同延伸。 无线电对多路复用信号进行滤波并检测控制音是否存在。 如果未检测到控制音调，则收音机优选保持默认接收模式。 如果检测到控制音，则无线电在控制信号的持续时间内以发送模式进行操作。