Improving ultra wideband (UWB) system by modified random combination of pulses

Abstract

Ultra-Wideband (UWB) technology uses very narrow pulses of nano-seconds duration to provide very high data rates. The pulses to be used for the UWB are very important and should meet the emission mask regulatory requirements to get good performance when transmitted over the channel. To meet these requirements, a combination of higher order derivatives of Gaussian pulses can be considered to form a combined pulse instead of transmitting them separately. The main aim of this paper is to improve the performance of Ultra Wideband (UWB) multiple access modulation system with a newly Proposed combined pulse, generated using a modified random pulse combining of the first five Gaussian derivative pulses with optimal shaping factors as basic functions. In order to meet the UWB power spectrum regulations, the power spectral utilization of the newly designed pulse is calculated and the bit error rate performance of the pulse position modulation time hopping system using the newly proposed pulse is analyzed in a multi-path channel environment using RAKE receiver. The simulation results carried out in MATLAB software shows that the new proposed combined pulse has higher pulse energy matching the spectral limits of UWB and an improved bit error rate performance as compared to the previous literature results.

Optimal PPM-Shift Based on Artificial Neural Network for 2PPM-TH-UWB systems

“…The high correlation coefficient (R= 0.99813) indicates that the PPMshift optimized by the LM-ANN perfectly fit (at 99.813%) those computed by Autocorrelation method, figure (6).…”

“…By far the most popular pulse shapes discussed in UWB communication literature are the Gaussian pulse and its derivatives, the basic Gaussian pulse is given as [5][6].…”

Survey on Ultra Wideband Reconfigurable Antenna for Improving the Performance of Cognitive Radio System

“…Vikas Goyal et al [10] "Improving Ultra Wideband (Uwb) System By Modified Random Combination Of Pulses", This paper presents the projected random combination approach of signal generation to be used for ultra wideband communication systems which might give economical leads to meeting the laws for the sending pulse set by the regulative authorities. The new combined pulse using the primary 5 gaussian derivative pulses with optimum shaping factors as basic functions are generated with success with the channel coefficients and pulse shaping factors meeting the facility spectral density necessities of an ultra-wideband signal.…”

Proposal of UWB-PPM with Additional Time Shift for Positioning Technique in Nondestructive Environments

“…The combination of PPM symbols and time of arrival (TOA) estimation algorithm using the Sub-Nyquist IR-UWB signal in the IR-UWB device is discussed in [14]. Turbo codes for PPM-IR UWB signals to improve the power spectral density (PSD) power signal density [15] and randomizing the pulses to improve the UWB system [16] were proposed. The noncoherent modulation techniques based on the use of the receiver adaptive thresholds applied to enhanced PPM in the IR-UWB and the direct chaotic communication UWB (DCC-UWB) systems were proposed to improve the bit error rate (BER) performance of the system in a multipath transmission environment [17].…”