scholarly journals Performance Improvement of Ultra Wideband Multiple Access Modulation System using a new Optimal Pulse Shape

2017 ◽  
Vol 6 (1) ◽  
pp. 20
Author(s):  
V. Goyal ◽  
B. S. Dhaliwal
Keyword(s):  
Performance Improvement ◽  
Pulse Shape ◽  
Multiple Access ◽  
Energy Levels ◽  
Rake Receiver ◽  
Correct Choice ◽  
Low Energy ◽  
Ultra Wideband ◽  
High Data ◽  
Very High

Ultra-wideband (UWB) uses very low energy levels to transfer data at very high data rate and bandwidth. An optimal and correct choice of transmission pulse shape is an important criterion in this technology. In this paper, we will present an approach for the generation of an optimal pulse shape with the optimal generation of pulse shape values that can provide effective results when transmitted using multiple access modulation technique over a multipath channel and received by a RAKE type receiver. The bit error analysis of constructed model is also given using Ideal Rake, selective RAKE, and partial RAKE receiver configurations.

A Joint Chip Equalization Adaptive Rake Receiver for DS-CDMA UWB Systems over ISI Channels

2012 ◽  
Vol 505 ◽  
pp. 274-281
Author(s):  
Feng Wang ◽  
Xuan De Ji
Keyword(s):  
Communication Systems ◽  
Rake Receiver ◽  
Ultra Wideband ◽  
Wireless Communication Systems ◽  
Delay Spread ◽  
High Data ◽  
Path Component ◽  
Isi Channels ◽  
Code Division Multiple ◽  
Transmitted Symbol

There is serious inter-symbol interference (ISI) when ultra-wideband (UWB) wireless communication systems work at high data speed since there is much larger channel delay spread. The serious ISI becomes a major factor that affects the performance of UWB systems. In this paper, suppression ISI is developed for direct sequence spread-code division multiple access (DS-CDMA) UWB systems with a high data speed, and a joint chip equalization adaptive Rake (JCE-Rake) receiver is proposed. The proposed JCE-Rake receiver spreads the number of traditional Rake receiver taps to collect multi-path component and equalize the inter-chip interference simultaneously. Then the soft output of JCE-Rake receiver is despreaded with the user's spreading code. Finally the decision is made to recover the transmitted symbol. The simulation results verify that ISI is suppressed effectively and the system performance is improved evidently.

INTERFERER REJECTION IMPROVED BY NOISE IN ULTRA-WIDEBAND TELECOMMUNICATIONS

2006 ◽  
Vol 06 (03) ◽  
pp. L317-L328 ◽  
Author(s):  
JOCELYN FIORINA ◽  
DAVID ROUSSEAU ◽  
FRANÇOIS CHAPEAU-BLONDEAU
Keyword(s):  
Signal Processing ◽  
Gaussian Noise ◽  
Multiple Access ◽  
High Speed ◽  
High Accuracy ◽  
Ultra Wideband ◽  
Positioning Systems ◽  
Very High ◽  
Low Rate ◽  
External Impulse

Ultra-wideband technology uses baseband transmission of low-power ultra-short information-bearing impulses, and represents a promising approach for very-high speed wireless communications with multiple access, as well as for low-rate high-accuracy positioning systems. The first demonstrations of the huge potential of ultra-wideband were based on hypotheses of perfect power control and multiuser interferences modeled as white Gaussian noise. Here, by explicitly modeling the interference with an external impulse signal, we demonstrate the possibility of improving the rejection of the interferer thanks to a constructive action of the noise. This is interpreted as a novel instance of the phenomenon of stochastic resonance or improvement by noise in signal processing.

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