scholarly journals BER and total throughput of asynchronous DS-OCDMA/WDM systems with multiple user interference

2004 ◽  
Author(s):  
F. Ghiringhelli ◽  
M. Zervas
Keyword(s):  
Multiple User ◽  
User Interference

scholarly journals Pulse Sign Separation Technique for the Received Bits in Wireless Ultra-Wideband Combination Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Rashid A. Fayadh ◽  
F. Malek ◽  
Hilal A. Fadhil
Keyword(s):  
Ultra Wideband ◽  
Separation Technique ◽  
Phase Shift Keying ◽  
Rake Receivers ◽  
High Data ◽  
Multiple User ◽  
Shift Keying ◽  
Combination Approach ◽  
User Interference ◽  
Binary Phase Shift Keying

When receiving high data rate in ultra-wideband (UWB) technology, many users have experienced multiple-user interference and intersymbol interference in the multipath reception technique. Structures have been proposed for implementing rake receivers to enhance their capabilities by reducing the bit error probability (Pe), thereby providing better performances by indoor and outdoor multipath receivers. As a result, several rake structures have been proposed in the past to reduce the number of resolvable paths that must be estimated and combined. To achieve this aim, we suggest two maximal ratio combiners based on the pulse sign separation technique, such as the pulse sign separation selective combiner (PSS-SC) and the pulse sign separation partial combiner (PSS-PC) to reduce complexity with fewer fingers and to improve the system performance. In the combiners, a comparator was added to compare the positive quantity of positive pulses and negative quantities of negative pulses to decide whether the transmitted bit was 1 or 0. ThePewas driven by simulation for multipath environments for impulse radio time-hopping binary phase shift keying (TH-BPSK) modulation, and the results were compared with those of conventional selective combiners (C-SCs) and conventional partial combiners (C-PCs).

Multiple-user interference in FH-MFSK mobile radio

2003 ◽  
Author(s):  
M. Mizuno ◽  
S. Sekizawa ◽  
H. Ryuko ◽  
T. Iwama ◽  
T. Saruwatari ◽  
...  
Keyword(s):  
Mobile Radio ◽  
Multiple User ◽  
User Interference

Performance of Different OCDMA Codes with FWM and XPM Nonlinear Effects

2017 ◽  
Vol 38 (3) ◽  
Author(s):  
Shivani Rana ◽  
Amit Gupta
Keyword(s):  
Phase Modulation ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Cross Correlation ◽  
Nonlinear Effects ◽  
Access System ◽  
Multiple User ◽  
Code Division Multiple ◽  
User Interference ◽  
Multiple Access System

AbstractIn this paper, 1 Gb/s non-linear optical code division multiple access system have been simulated and modeled. To reduce multiple user interference multi-diagonal (MD) code which possesses the property of having zero cross-correlation have been deployed. The MD code shows better results than Walsh-Hadamard and multi-weight code under the nonlinear effect of four-wave mixing (FWM) and cross-phase modulation (XPM). The simulation results reveal that effect of FWM reduces when MD codes are employed as compared to other codes.

scholarly journals Design and Analysis of Three-dimensional M-sequence Bipolar OCDMA Spectral Amplitude Code

2021 ◽  
Author(s):  
SUMIT KUMAR GUPTA
Keyword(s):  
Three Dimensional ◽  
Spectral Amplitude ◽  
Code System ◽  
Multiple User ◽  
Received Power ◽  
Performance Variation ◽  
Bipolar Mode ◽  
M Sequence ◽  
Decoder Design ◽  
User Interference

Abstract This paper has been focused to utilize the m-sequence code in spectral/time/spatial OCDMA domain in a bipolar mode (Three Dimensional modes). The scheme has elegantly incorporated the design of an encoder and a decoder such that the system efficiently generates the code in three-dimensional bipolar mode. The decoder design is such that it effectively suppresses the multiple user interference (MUI) of three-dimensional code. System analyses are carried for defining the BER performance variation with users acceptability and received power. The observed results demonstrate that the cardinality of m-sequence three-dimensioanl bipolar code is larger than the existing 3D Pascal code, 2D -MDW,3D -PDC, 2D-PDC, 1D-CWH and 1D-MS codes. The received power in proposed system is -5.8dBm is lesser than the 3D Pascal Code at 10 -18 similarly the users adoption in system more than 210% can be accomplished as compared to 3D Pascal code.

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