DIGITAL RADIO RELAY METHOD AND ADJUSTMENT OF TRANSMISSION POWER IN DIGITAL RADIO RELAY METHOD

摘要

PURPOSE: To realize an interference-free receiving operation by increasing the transmission power temporarily to a level close to a maximum transmission power when the variation rate of receiving signal level or the rough estimate of error rate exceeds a predetermined threshold level. CONSTITUTION: Presence of a multipath state is observed by detecting the state of a signal Smp representative of an undue variation rate of signal level. When a multipath state is detected (Smp=1), state of a signal Serr representative of error state is observed at a point 22 and a decision is made whether an error state is present. In case of a state Serr=1, the multipath state and the error state are present simultaneously and a maximum transmission power Pmax is set at a point 23 and transmission processing is performed with that maximum power during a tie period T1 after final detection of simultaneous occurrence of the multipath state and the error state. The purpose for employing the maximum transmission power is to minimize the time when the error rate is higher than 10-3 to 10-6 at the time of receiving a signal.