Amit Wason

Ergodic capacity enhancement of communication system using ASTC and MMSE coding

In multiple input multiple output (MIMO)- orthogonal frequency division multiplexing (OFDM) communication system, OFDM spreads the data over a number of carriers which are at specific predefined frequencies and makes a reduction or elimination of the Inter Symbol Interference. But the prime concern of OFDM system is the value of ergodic capacity of the communication system. To overcome this drawback, a proposition is given for a communication model with Algebraic Space Time Codes encoder and Minimum Mean Square Error equalizer. We have inculcated a comparative analysis of the different outcomes i.e. ergodic capacity with several values of signal to noise ratio by incorporating different number of antennas available from primitive technologies and thus the obtained results are overwhelmed than all the others before.

Intelligent Requests Algorithm Based Scheduling and Efficient Dynamic Bandwidth Allocation to Improve QoS for EPONs

Abstract The proposed traffic grooming methodology for long-reach-passive optical networks will decrease the latency in upstream. The scheduling and wavelength assignment for ethernet passive optical networks has been shown to perform much better in terms of delay. The dynamic traffic grooming algorithm based on intelligent water drop is proposed in which new depositions function has been introduced for efficient handling of bandwidth. Therefore, once equally distanced optical network units were scheduled on constant wavelengths, the void formation impact is reduced. The outcomes conjointly depict the result of the planned methodology on bandwidth utilization improvement and jitter by 1.46 and 408.66 µs improvements respectively, even overall latency is improved by 465.83 µs by value. These results depict the validity of the planned dynamic bandwidth allocation methodology for traffic grooming.

Investigation of Blocking Performance in GMPLS Networks

Abstract The call blocking is the most vital factor in generalized multiprotocol label switching (GMPLS) Networks. Call blocking depends upon many factors such as traffic intensity, number of servers and number of links. Call blocking performance for GMPLS networks has been calculated in this paper by using a proposed mathematical model. The proposed model investigates the dependency of probability of call blocking upon the number of wavelengths and number of links. In the suggested model, the blocking performance of GMPLS network is improved.

Performance Evaluation of Optical Amplifiers for High-Speed Optical Networks

Abstract Optical networks were invented by the developing and developed nations in order to extend the capacity required for communication systems in a worthwhile way. In this paper, the attempt is done to improve the capacity and performance of semiconductor optical amplifier, Raman and erbium-doped fiber amplifier (EDFA) amplifiers used in optical networks. The potential of different optical amplifiers operating at 8×10 Gbps has been examined and their performance was compared on behalf of different parameters, viz. eye opening, eye closure, jitter, quality factor and transmission distances. It was observed that EDFA provided the consistent good quality of communication for long-distance transmission up to 150 km along with better eye opening and eye closure with acceptable jitter performance. Further, it is observed on the basis of quality factor and bit error rate that EDFA gives comparably better performance than Raman amplifier. Moreover, it is seen that as the data rate of the system increases, the quality of communication signals starts decreasing.

Performance Optimization of Optical Amplifiers for High Speed Multilink Optical Networks using Different Modulation Techniques

Abstract Next generation optical networks require large capacity communication networks for proper utilization of gain bandwidth of the networks. Optical amplifiers with wavelength division multiplexed (WDM) systems are the key technologies for the realization of these networks. In this paper, we have investigated the performance of the networks using different modulation techniques, such as return-to-zero (RZ), non-return-to-zero (NRZ) and duobinary. Attempts were taken to design 8 channels, 10 Gbps WDM network at channel spacing of 0.8 nm. An innovative model with EDFA-Raman amplifier is designed to examine the performance of the different modulation schemes. From the results, it is found that NRZ configuration gives maximum output power and good quality of communication as compared to other modulation schemes. Further, it is seen that with increase in channel dispersion from 2 to 4 ps/nm/km, the quality of the signal started decreasing.

Fallacious Node Algorithm for Performance Enhancement in Optical-Burst-Switching Networks

Abstract In this paper, fallacious node algorithm is formulated for performance enhancement of an optical-burst-switching (OBS) network. With the procedural and observational analysis, we have demonstrated that the blocking probability is extremely unnoticeable, during a call establishment, while collectively discarding the faulty nodes from the selected paths. There may be distinguishing values of blocking probability because of random value of congestion on each path. The blocking probability is restrained so as not to be more than 10 % on several values on traffic and congestion. The blocking probability diminishes and becomes imperceptible with the incorporation of fallacious node algorithm and subsequently the performance of optical network is highly aggrandized. Thus the fallacious node algorithm manifests incredible prospects for optical networks as the key features such as the accessibility; sustainability and reliability of the network are highly appreciated and upgraded.

Effects of Diverse Dispersion Compensation Formats at Different Data Rates in Light-Wave System

Abstract In this article, diverse dispersion compensating techniques are demonstrated and also examined their performance in the presence of nonlinearites at different data rates in between 2.5 and 20 Gbps. Dispersion compensation formats such as pre-compensation, post-compensation, hybrid (symmetrical) compensation, Fiber Bragg grating (FBG) and optical phase conjugation (OPC) are used in single-channel light-wave system. The performance is evaluated on the behalf of different parameters such as Q value, Bit error rate (BER) and eye patterns. It is observed that in dispersion compensation, hybrid compensation format gives better results than the other compensation formats. It is also observed that hybrid compensation format is suitable for high data rates up to 20 Gbps while pre- and post-compensation gives better results up to 15 Gbps and FBG and OPC formats covered better results up to 10 Gbps.