Devi Chadha

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We have investigated the performance and reliability improvement of cooperative free-space optical (FSO) communication over single input single output (SISO) system in this paper. The bit error rate (BER) analysis with quadrature phase shift keying (QPSK), gamma–gamma channel model and pointing error has been demonstrated for SISO and cooperative system.(More)
In this paper, we present the performance analysis of spatially multiplexed Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) Free Space Optical Communication system over turbulence induced fading channels MIMO is used with OFDM to enhance the performance and the capacity of the FSO system. The use of spatial multiplexing(More)
The Augmented Data Vortex switch has been proposed in our earlier publications as a high capacity, high throughput, and low-latency all optical packet switched interconnection network for optical switching that can overcome major challenges of all optical packet switching [1, 2]. Recently there has been much analysis and comparison of optical multistage(More)
In this paper, the performance improvement of a free space optical communication system with multi-hop and beam optimization has been studied. Novel closed-form expressions for the end-to-end average bit error rate, outage probability and average capacity of multi-hop free space communication system with decode-and-forward relaying are derived. Beam(More)
High-altitude platforms (HAPs) have been proposed previously for transmitting radio frequency signals from ground stations over large distances of several hundred kilometers. These HAP architectures suffer from the limitations of data rate. The availability of the system has also not been evaluated for these architectures. In this paper, we propose a(More)
The tremendous growth of the high speed Internet and data traffic has created an enormous demand for transmission bandwidth of dense wavelength division multiplexed (DWDM) optical communication systems. With the advancement of wideband fiber-optical amplifiers, DWDM optical transmission systems are capable of providing capacities in excess of hundreds of(More)
In this paper, we have evaluated the performance of a low-density parity-check (LDPC)-coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) free space optical (FSO) communication system. Closed form expressions for the average bit error rate and throughput with diversity using equal gain combining have been obtained(More)