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Recent MIMO applications have noticeably magnified the importance of multi antennas. Antenna engineers are therefore constantly challenged with the temptation to search for optimum designs. In recent years, evolutionary optimization (EO) techniques are finding growing applications to the design of electromagnetic systems of increasing complexity. Among various EO's, nature inspired techniques such...
The automatic generation of behavioral amplifier models based on the measurement of the input and output signals imply demanding requirements for the identification algorithm. In addition to the computational efficiency it is very important that such an algorithm needs only a low number of predefined parameters for the fitting process. To fulfil these requirements we suggest the use of a modified...
Accurate indoor positioning with minimum dedicated infrastructure is required for certain critical applications such as emergency rescue, fire brigades or incident management. This paper presents an innovative TOA-based ranging technique for IEEE 802.11 networks, which is one of the essential steps towards achieving the desired location technique. Our approach is based on RTT measurements using standard...
Data acquisition for low cost digital-controlled adaptive analog predistortion of a power amplifier is discussed. The predistorted amplifier has a RF input that is a UMTS signal comprising one or two adjacent carriers. The predistortion corrects for memoryless distortion. The data acquisition system measures the complex gain of the predistorted amplifier as a function of the input envelope, creating...
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