We propose a novel signal model by combining the sparse stepped frequency signals with chaotic signals, i.e., the sparse stepped chaotic signal (SSCS) model, as well as the corresponding compression algorithm based on compressed sensing. In SSCS, the chaotic signals are modulated to sparse stepped frequencies to compose a transmitting burst. When receiving, the echo signals are demodulated to t...

Adaptive modulation is applied in conjunction with a decision-feedback equalizer (DFE) in order to mitigate the effects of the slowly varying wide-band multipath Rayleigh fading channel in a noise-limited environment. An upper-bound mean bit-error rate and bits per symbol performance is introduced for this scheme by utilizing the pseudo signal-to-noise ratio at the output of the DFE in order to...

Packet transmission of digital data is nowadays adopted in several wireless communications systems such as satellite time-division multiple access (TDMA) and terrestrial mobile cellular radio, just to mention a few. In those scenarios, the received signal may suffer from significant time-varying Doppler distortion due to relative motion between transmitter and receiver. This occurs, for instanc...

We demonstrate the ability to generate ultra-high-frequency sequences of broadly wavelength-tunable, high-intensity laser pulses using a custom-built optical parametric oscillator pumped by the third-harmonic output of a "burst-mode" Nd:YAG laser. Burst sequences consisting of 6-10 pulses separated in time by 6-10 mus are obtained, with average total conversion efficiency from the 355 nm pump t...

Premature ventricular contractions (PVC) elicit larger bursts of multiunit muscle sympathetic nerve activity (MSNA), reflecting the ability to increase postganglionic axonal recruitment. We tested the hypothesis that chronic heart failure (CHF) limits the ability to recruit postganglionic sympathetic neurons as a response to PVC due to the excessive sympathetic activation in these patients. Sym...

Gravitational waves from binary neutron star inspirals have been detected along with the electromagnetic transients coming aftermath of merger in GW170817. However, much is still unknown about post-merger dynamics that connects these two sets observables. This includes if, and when, remnant collapses to a black hole, what are necessary conditions power short gamma-ray burst, other observed coun...