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In this paper, a new cooperative spectrum sharing protocol that employs space-time block coded spatial modulation (STBC-SM) at the secondary user (SU), is proposed for overlay cognitive radio (CR) networks. STBC-SM is applied at the secondary transmitter (ST) which transmits its data by both modulated symbols and antenna combinations while conveying PU's data only by modulated symbols. This protocol...
This paper presents a target localization problem based on the time difference of arrival (TDOA) measurements by employing an improved genetic algorithm (GA) for estimation. The weighted least square (WLS) technique is applied as an efficient existing approach. The TDOA target localization problem is formulated as an optimization problem, with a highly nonlinear and multimodal objective function....
We develop two resistant to noise secure communication schemes based on time-delayed feedback oscillators with switching of chaotic regimes. One of the proposed schemes exploits the identical synchronization between the transmitter and receiver while another system uses the regime of generalized synchronization. The proposed schemes are studied numerically and implemented in a physical experiment.
In this paper, a new approach using the ultrasonic transceiver for the distance measurement between more points with the possible data communication is described. In the beginning, the paper deals with the theoretical problem of the ultrasonic distance measurement and how the communication can be coded into the transmission. Then it proposes a working hardware prototype which is capable to communicate...
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