| 摘要 |
<p>The receive part of an array antenna of base station system may be interpreted as self-calibrating. However the transmit direction of the array antenna may not coincide with the receive direction due to the difference in receive and transmit frequency. The present application teaches how a correction be performed for the transmitting direction by using the same phase compensations of the receiving direction also in the transmitting direction with a proportional correction for the difference in transmit frequency. A Frequency Domain Duplex (FDD) system is foreseen as the prerequisite for the applicability of present invention, but it will also work for a Time Division Duplex (TDD) system. By calculating during reception a first feed cable weight set by means of an adaptive algorithm at the receive frequency a corresponding second cable weight set for a transmit frequency can be calculated. Applying the corresponding second cable weight set then forming a proportional phase correction for the array antenna feed cables at transmit frequency will facilitate a continuous beam steering with coinciding receive and transmit directions. No sensors at the antenna connector level at the top of the mast are necessary for this application.</p> |
