In this paper we introduce a novel method for high data rate transmission in ultra-wideband (UWB) communications systems. This is achieved through a new approach based on hybrid techniques between pulse position modulation (PPM), pulse amplitude modulation (PAM) and pulse shape modulation (PSM) using combinations between a minimum possible number of modified hermite polynomial (MHP) functions b...

Cochlear implant speech processors transmit temporal features of sound as amplitude modulation of constant-rate electrical pulse trains. This study evaluated the central representation of amplitude modulation in the form of phase-locked firing of neurons in the auditory cortex. Anesthetized pigmented guinea pigs were implanted with cochlear electrode arrays. Stimuli were 254 pulse/s (pps) train...

Cochlear-implant speech processors transmit temporal features of sound as amplitude modulation of constant-rate electrical pulse trains. The present study evaluated the central representation of amplitude modulation in the form of phase-locked firing of neurons in the auditory cortex. Anesthetized pigmented guinea pigs were implanted with cochlear electrode arrays. Stimuli were 254 pulse/s (pps...

Whenever a continuous-tone image has to be displayed on a bi-level medium, some kind of halftoning has to be carried out. Nowadays processing of the continuous-tone image is often done by a computer, i.e. the sampled and quantized continuous-tone image is transformed into a binary image by a halftoning algorithm. In the following we will assume the continuous-tone image to be scaled between 0 a...

A ny RF communications system that uses carrier on/off pulses can be designed to have better receiver sensitivity by using negative or zero group delay narrow band filters in the receiver. These filters greatly reduce the bandwidth normally required by removing the sidebands, while retaining the necessary information in the pulsed on/off carrier. SNR improvements greater than 40 dB are being ob...

Gradual multi-pulse pulse position modulation (Gradual MPPM) is proposed as a new modulation technique in optical communications systems. The proposed modulation scheme achieves both higher transmission efficiency and lower levels of SER than ordinary MPPM scheme at the same average power level.

BER analysis of Impulse Radio Ultra Wideband (IRUWB) pulse modulations over S-V channel model is proposed in this paper. The UWB pulse is Gaussian monocycle pulse modulated using Pulse Amplitude Modulation (PAM) and Pulse Position Modulation (PPM). The channel model is generated from a modified S-V model. Bit-error rate (BER) is measured over several of bit rates. The result shows that all modu...