Global navigation satellite system signals are known to be an efficient tool monitor the Earth ionosphere. We suggest Galileo E5 AltBOC phase and pseudorange observables—a single-frequency combination—to estimate ionospheric total electron content (TEC). performed a one-month campaign in September 2020 compare noise level for different TEC estimations based on dual-frequency data. Unlike GPS, G...

Abstract— The paper describes the application of the Viterbi algorithm in the implmentation of a maximum likelihood receiver in a chaos communication scheme. The Viterbi decoder is constructed based on a symbolic state representation of the transmitter’s chaos generator. The presented simulation results show that the classical Binary Phase Shift Keying (BPSK) modulation scheme can be slightly o...

A retrodirective array based on a novel, compact phase-conjugating mixer with conversion gain has been developed. A 4element prototype array demonstrates excellent retrodirectivity. A simplified BPSK signal transmitted by the array is recovered successfully at the source location, demonstrating great potential for remote tagging and wireless sensor applications.

Performance evaluation of time-hopping UWB using various modulation techniques has been proposed. Then the performance improvement is analysed based on the BERs of various existing methods. Recently a new method called TH-BPSK UWB system is proposed which provides a better performance than all other existing systems. The literature survey discusses all the existing techniques of UWB communication.