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Santhosh Kumar, G.
- 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.
Keywords
Noise, Impulsive noise, OFDM, Oversampling, Random Process, Blanking Nonlinearity, Windowing Nonlinearity.
- Suppression of Impulsive Noise in Over-Sampled OFDM
Authors
1 Vellore Institute of Technology, Tamilnadu, IN
2 School of Electronic Engg., VIT University, IN
Source
Digital Signal Processing, Vol 2, No 3 (2010), Pagination: 25-31Abstract
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.Keywords
Noise, Impulsive Noise, OFDM, Oversampling, Random Process, Blanking Nonlinearity, Windowing Nonlinearity.- Specific Absorption Rate Analysis of Aperture Coupled Antenna for Wireless Body Area Network Applications
Authors
1 Department of Electronics and Communication Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 38 (2016), Pagination:Abstract
Objective: This work presents the design and analysis of miniaturized aperture coupled antenna. The proposed antenna is designed to operate at 2.45GHz of Industrial Scientific Medical (ISM) band and intended to use for Wireless Body Area Network Applications (WBAN). Methods/Statistical analysis: The H shaped patch with aperture coupled feeding is incorporated to get symmetrical radiation pattern. By adjusting the dimensions of ground plane notch and feed line the miniaturization and desired operating frequency is achieved. The antenna’s performance is simulated at the vicinity of human arm biological tissue model to measure Specific Absorption Rate (SAR). Findings: The proposed antenna has compact form factor of 0.32λo x 0.3λo x 0.021λo. The electromagnetic numerical simulation software shows the SAR of 2.71 W/Kg. The antenna’s performance in terms of bandwidth, gain, radiation pattern is found invariable in presence of human arm tissue model. Application/Improvements: The result shows the proposed antenna possesses low SAR and small compact form factor which can be applicable for WBAN applications.Keywords
Aperture Coupled Antenna, Human Arm Model, Industrial Scientific Medical Band, Specific Absorption Rate, Wireless Body Area Network.Full Text
