Improved Direction of Arrival Estimation using Multiple Signal Classification (MUSIC) Algorithm with Decomposition and Normalization

It is important to determine the direction of arrival (DoA) of targets in various applications such as radar and sonar. Multiple Signal Classification (MUSIC), Estimation of Signal Parameters with Rotational In variance Technique (ESPRIT), and Weighted Subspace Fitting (WSF) are subspace-based methods that can be used to improve DoA estimation. MUSIC is effective for high-resolution, uncorrelated signals, but may struggle in cases where there are two nearby targets with a low signal-to-noise ratio (SNR). The goal of this research is to improve the performance of the MUSIC algorithm for DoA estimation with low SNR signals. The proposed solution involves decomposing and normalizing the signal during transmission. Simulations were conducted to test the modified procedure with MUSIC algorithm for DoA estimation, and it was found that received signal power improved though there is noisy environment as well as system can detect more number of targets. The proposed technique of decomposition and normalization could also be applied in other areas such as WiFi communication, autonomous vehicles and biomedical signal and image processing etc

Harvesting RF Energy- A Review

There is a demand of power at remote locations for many applications such as charging of batteries for WSN. Due to advancement in technology, many devices operate at low power level. The RF energy can be harvested and fed to these devices on board. RF signal is available globally and energy can be harvested from this signal. It is available at all times and can be used as source of energy for low power devices. RF harvesting unit consists of three modules, Antenna, Matching network and Rectifier circuit. This paper presents an overview of each stage of RF harvesting architecture. The paper introduces designed antennas, factors affecting the different parameters of antenna like bandwidth, gain and efficiency. Design of antenna with miniaturization, harmonic rejection and frequency selectivity is explained. The comparative study of matching network such as L type, π type and microstrip line is described for maximum power transfer and different rectifier circuits for RF to DC conversion are discussed