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Achieving maximum optical amplifier or repeater spacing in fiber-optic transmission system is compromised by the input power limit due to stimulated Brillouin scattering (SBS). In digital transmission, SBS causes bit error rate degradation. In this paper, we have established analytical model for spectral broadening due to self-phase- and cross-phase modulation and using this broadening, SBS effect...
Chipshape-dependent bit error rate (BER) performance of direct sequence optical code division multiple access is analytically studied in fiber optic communication with cascaded in-line optical amplifiers in presence of group velocity dispersion. In our analysis, supper-Gaussian, and Hyperbolic-Secant shaped optical orthogonal codes are employed as address sequence. Avalanche photodiode is used in...
In this paper a composite analytical model of DS-CDMA wireless communication system considering multipath Nakagami fading along with Doppler frequency shift, tracking jitter, local oscillator frequency offset and multi-access interference (MAI) for different PN sequences is presented. The analysis presents the development of a novel approach to find the pdf (probability density function) of the signal...
Performance analysis is carried out for all optical wavelength converter based on cross-phase modulation in a HNL Fiber followed by a MZI. Analysis has been carried out to find the output converted signal and the crosstalk due to the wavelength converter. The expression for signal to crosstalk ratio and the efficiency of wavelength conversion are derived. The performance results are evaluated numerically...
In this paper, a numerical method is presented to evaluate the bit error rate (BER) of different Orthogonal Space-Time Block Codes (OSTBCs) over Rayleigh fading channel for different transmission bit rate. The comparisons of Orthogonal Space-Time Block Codes are made with the equivalent uncoded Single-Input Single-Output (SISO) channel and uncoded space diversity. The result shows that a full rate...
Wavelength division multiplexing (WDM) in optical fiber networks has gained wide acceptance as a means to handle the ever-increasing bandwidth demands of network users. An optical add-drop multiplexer (OADM) is an important device to add or drop wavelengths and crosstalk in OADM degrades the performance of WDM system. In this article we have developed an analytical model to study the incoherent crosstalk...
In the MIMO-OFDM system, the carrier frequency offset and phase noise cause loss of orthogonality among subcarriers and leads to intercarrier interference (ICI). This paper considers ICI self-cancellation schemes using space frequency block code (SFBC) in MIMO-OFDM system. In this paper we have analytically derived expression for common phase error (CPE), ICI, carrier to interference (CIR) and BER...
The frequency offset in orthogonal frequency division multiplexing (OFDM) system damages the orthogonality of OFDM sub carriers and cause intercarrier interference (ICI) which in turn quickly reduces the performance of the system. In this paper, the authors have proposed an efficient and new scheme for ICI cancellation that is an improved version of ICI self cancellation technique. Through a detailed...
This paper considers the performance enhancement of orthogonal space time block coded (OSTBC) multiple-input multiple-output system based on an optimal training strategy. Pairwise error probability (PEP) based performance analysis provides us the training design tools as well as a generic expression for the performance improvement due to optimal training compared to the conventional case for OSTBC...
Energy efficient data transmission is one of the key factors for energy constraint wireless sensor network (WSN). Cooperative communication explores the energy efficient wireless communication schemes between multiple sensors and data gathering node (DGN). In this paper, an energy efficient cooperative technique is proposed considering low density parity check (LDPC) codes. The result shows that the...
Error control coding (ECC) is a classic approach used to increase link reliability and lower the required transmitted power. It provides coding gain, resulting in transmitter energy savings, at the cost of added decoder power consumption. But the choice of ECC is very critical in the case of wireless sensor network (WSN). Since the WSNs are energy constraint in nature, both the BER and power consumption...
The focus of this paper is on the performance of an orthogonal frequency division multiplexing (OFDM) transmission system considering the combined influence of receiver noise, Rayleigh fading and the timing error due to imperfect slot synchronization at the receiver. Performance results are presented in terms of BER, BER improvement and BER-floor in presence of inter-channel interference (ICI) and...
The statistical impact of Coherent and Incoherent crosstalk contributions in a proposed L-WIXC configuration due to different optical propagation delay differences, bit duration etc. is analysed. Considering coherent and incoherent crosstalk analytical expressions are developed for electric field, leakage crosstalk, Bit-Error-Rate (BER) and power penalty. Besides, the effect of all crosstalk contributions...
Performance of a single input multiple output (SIMO) orthogonal frequency division multiplexing (OFDM) system is analyzed considering the channel characterized by frequency selective and Rayleigh fading environment with maximal ratio combining (MRC) at the receiver. The analysis includes the effect of inter-carrier interference (ICI) due to frequency offset caused by Doppler frequency shift. The result...
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