| 摘要 |
A tuning circuit, or a method of tuning an antenna device, comprises: a digital controller 5 connected to individually operable switches 4a-c which connect between multiple antenna ports 2a-c and respective matching circuits 3a-c to allow independent tuning of the matching circuits. A baseband processor 6 determines a received signal strength indication RSSI signal and a signal to noise ratio SNR signal for each signal port 2a-c and sends these signals to a digital controller 5 which adjusts the switches 4a-c to achieve a required RSSI and SNR values. RSSI values and related switch and/or matching circuit settings may be stored in a look-up table of a memory. An operational amplifier and analogue to digital converter may be used to detect the voltage, and hence the power loss, across the matching circuit. The processor may also determine a bit error rate (BER) for the signals of each signal port. Alternatively, there is disclosed a tuning circuit, or a method of tuning an antenna device, comprising: a monitor circuit connected across a matching circuit where the monitor circuit includes an amplifier and an analogue to digital converter which detects the voltage across the matching circuit and the controller 5 then tunes the matching circuit to reduce the power loss across the matching circuit. |
