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Sangeetha, N.
- Free Space Optics Performance, Issues and Applications
Authors
1 School of Electronics Engineering, Vellore Institute of Technology University, Tamilnadu-632 014, IN
Source
Wireless Communication, Vol 3, No 11 (2011), Pagination: 793-796Abstract
Free-space optics (FSO) is a wireless line of sight technology that transmits high data rates using a narrow beam light through the air as transmission medium. The demands on bandwidth and spectral availability are endless. Many telecommunications providers have been deploying different types of access technologies, such as cable and fixed wireless, in order to fulfill the needs. In many cases, transmission using fiber optics is preferred due to their ability to send high data rates with high reliability. This paper shows that the Free-space optics technology is an alternative to the already established fiber optics technology. The main reasons are it requires less installation time and it can save the required costs significantly without losing the capability to send high data rates. The paper also presents an assessment on the performance and current state of the Free Space Optics technology. It represents FSO’s limits in use under certain conditions; there are also circumstances where it can provide a high speed secure transmission channel.Keywords
FSO, Last Mile Solutions, OWC, RF.
- Impulsive Noise Reduction Technique for Oversampled OFDM
Authors
1 School of Electronics Engg, Vellore Institute of Technology University, Tamilnadu- 632 014, IN
2 School of Electronics Engg, Vellore Institute of Technology University, Tamilnadu-632 014, IN
Source
Wireless Communication, Vol 2, No 3 (2010), Pagination: 79-85Abstract
Impulsive noise affects the performance of orthogonal frequency division multiplexing (OFDM) systems. In OFDM systems, detecting of impulsive interference is challenging since both OFDM signals and impulsive noise follows Gaussian distributions. This paper proposes windowing technique nonlinearity scheme to detect and remove the over-sampled impulsive interference in OFDM systems. The analysis of the false detection probability (FDP) and successful detection probability (SDP) is given. The results indicate that the proposed scheme detects impulsive noise efficiently. In addition, the closed-form expressions for the FDP and SDP of blanking nonlinearity scheme which is widely used to remove impulsive interference are also derived. These two techniques are tested under audio signal instead of OFDM which leads the testing easy also applicable in UWB communication and also explained the new techniques to increase the level of SDP and compared with the previous techniques.