Efficient Image Transmission over WVSNs Using Two-Measurement Matrix Based CS with Enhanced OMP

WVSN is a collective network of motes containing visual sensors. The nodes in the network are capable of acquiring, compressing, and transmitting successive images to the sink. To increase the lifetime of such network, it is essential to reduce the amount of dataflow across the network without losing the integrity. This paper proposes a CS-based image transmission system to reduce the number of measurements required to represent the image. It utilizes a two-measurement matrix-based CS. TMM with CS leads to 2.8% to 6.7% and 0.67% to 7.9% reduction in the number of measurements compared to one MM-based CS while using DCT and binary DCT, respectively. Similarly, TMM with NUS CS leads to 5% to 40% (DCT) and 1.4% to 20% (binDCT) reduction in the number of measurements than one-measurement matrix-based NUS CS. An Enhanced Orthogonal Matching Pursuit algorithm is also proposed, which produces nearly 2% to 26% better recovery rate with the same number of measurements than the conventional OMP algorithm. Reduced measurements and better recovery rate achieved will enhance the lifetime of the WVSN, with considerable image quality. Rate distortion analysis of the proposed methodology is also done

Single event transient mitigation techniques for a cross‐coupled LC oscillator, including a single‐event transient hardened CMOS LC‐VCO circuit

Abstract Single‐event transients (SETs) due to heavy‐ion (HI) strikes adversely affect the electronic circuits in the sub‐100 nm regime in the radiation environment. This study proposes techniques to mitigate SETs in CMOS voltage‐controlled oscillators (VCOs) without affecting the circuit specifications. A circuit asymmetry technique is used for faster recovery of the oscillator in the event of a single event transient (SET) caused by an ion hit. Also, a new SET tolerant inductor capacitor‐voltage controlled oscillator (LC‐VCO) topology is proposed for a radiation environment that shows reduced phase displacement, amplitude displacement, and recovery time. A comparison has been made with various LC‐VCOs that have an inherent rad‐hard capability which proves a significant improvement in SET sensitivity