Method of improving efficiency of radio channel usage in overlapping coverage areas

摘要

A method is described for transmitting a signal over a wireless communications channel, the communications channel being common to primary and secondary communications systems that have at least partially overlapping areas of coverage. The primary system has a low duty cycle and transmits random bursts having a characteristic first duration. The method involves transmitting bursts on the secondary system, which have a duration at least equal to three times the first duration and contain forward error correcting codes to permit data contained therein to be recovered in the event of a collision with a burst on the primary system. The bursts on the secondary system have an intensity sufficiently below the intensity of the bursts on the primary system to avoid interference therewith.