We propose a direction of arrival (DoA) estimation technique, which is enabled by a single printed patch antenna capable of four reconfigurable beams at the operative frequency of 2.45 GHz. The direction of the messages sent by a nomadic wireless node is estimated and stored without the need of lengthy offline measurements, by correlating the real-time received signal strength actual data and the expected antenna beams. The comparison is implemented with a least square technique with an extremely reduced computational cost. Experimental validations demonstrate the DoA estimation capability, with a mean error <2.3°with a variance of 1.9°within a domain of 90°.
A new approach to the average efficiency improvement based on a combined 2-PAs architecture is presented. It uses discrete power control and dynamic supply voltage, which allows enhanced efficiency at low power level. It enables envelope tracking RF transmitter with higher average efficiency than classical approach. At 2.14 GHz CW we got an average efficiency of 42.5%, 6.1% better than the classical approach with equal peak P out = 35 dBm. The peak increment of PAE is 13.3% at 16.4 dB of power back-off.Index Terms -envelope tracking, average efficiency, GaN PA, dynamic voltage bias control.
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