Search results for: N. Kumaratharan
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Computational Intelligence > 36 > 3 > 1275 - 1289
Recently, Internet becomes a most common medium for transferring critical data and the security of the transmitted data gains maximum priority. Image steganography has been developed as a well‐known model of data hiding which verifies the security level of the transferred data. The images offer high capacity, and the occurrence of accessibility over the Internet is more. An effective steganography...
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Concurrency and Computation: Practice and Experience > 32 > 4 > n/a - n/a
Nowadays, with huge advent of mobile technology and surveillance supports there is increase in demand for visual quality rapidly. H.265/HEVC focuses on HDVC techniques with employing edge object detection‐based scheme. This paper proposes a novel discrete curvelet transform and modified WHOG for video surveillance services. The proposed discrete curvelet transform and modified WHOG‐based schemes were...
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International Journal of Imaging Systems and Technology > 28 > 3 > 186 - 195
Wireless technology plays a vital role in the Electronic health (e‐health) applications such as telemedicine and remote patient monitoring. One of the major challenges of telemedicine applications is ensuring adequate quality of service and realizing precise diagnosis. Telemedicine employs image fusion to enhance the quality of medical image for better diagnosis. However, the transmission of medical...
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Multi carrier code division multiple access (MC-CDMA) is an efficient multi carrier modulation (MCM) technique that mitigates problems like spectral limitation and distortion due to multipath channels. Nevertheless, in a high speed mobile communication channels the orthogonality among subcarriers are destroyed due to multipath fading. The loss of orthogonality can cause inter carrier interference...
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A turbo block code (TBC) technique for improving the performance of a multi-carrier code division multiple access (MC-CDMA) system in terms of bit error rate (BER) is proposed in this paper. The objective of this work is to develop a coding scheme that generates low BER code-words. By implementing a time domain TBC, designed using powerful low density parity check (LDPC) code, the BER performance...
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The convergence of high data rate multimedia services such as speech, audio, video, image and data will be the main features of future wireless systems. Multi-carrier code division multiple access (MC-CDMA) is one of the powerful techniques to meet the requirements of next generation broadband and wireless mobile communication systems. MC-CDMA system allows many users to get the benefit of both orthogonal...
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Multi-carrier direct sequence code division multiple access (MC-DS-CDMA) is an attractive candidate for fourth generation (4G) wireless communication systems due to its high spectral efficiency, large system capacity and high flexibility in data rate. Multi-carrier systems are very sensitive to carrier frequency offset (CFO) caused by oscillator instabilities or by Doppler shifts, which leads to loss...
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In this paper turbo multi-user detection (MUD) technique is proposed for multi carrier code division multiple access (MC-CDMA) system to overcome the affects of multiple access interference (MAI) caused by the inter-cell and intra-cell interference and near far effect. The proposed technique estimates the interference from the unknown users and the interference estimate is subtracted from the received...
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The combination of multiple antennas and multi-carrier code division multiple access (MC-CDMA) is a strong candidate for the downlink of future mobile communications. The study of such systems in scenarios that model real life transmissions is an additional step towards an optimised achievement. Nevertheless, when transmitting over fading channel multi-cell interference occurs and this degrades the...
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Computers and Electrical Engineering > 2010 > 36 > 1 > 224-233
Multiple-input Multiple-output (MIMO) multi-carrier code division multiple access (MC-CDMA) is a strong candidate for the downlink of future mobile communications to obtain high data rates. Nevertheless, during any transmission over fading channel, performance of MC-CDMA systems are highly degraded due to the presence of multiple access interference (MAI). Multi-user detection (MUD) and channel estimation...
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Multi-carrier code division multiple access (MC-CDMA) systems achieves high data rates in wireless communication. Nevertheless, when transmitting over fading channel, multi-cell interference occurs which degrades the performance of the system. Site diversity technique is applied to the system to overcome multi-cell interference. However, multi-cell interference has not been completely eradicated as...
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The combination of multiple antennas and multicarrier code division multiple access (MC-CDMA) is a strong candidate for the downlink of future mobile communications. The study of such systems, in scenarios that model real-life transmissions is an additional step towards an optimised achievement. Channel estimation is employed to improve its performance by characterising the channel. In this paper...
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In this paper space time serial interference cancellation (STSIC) detection technique is proposed for multi-user multiple-input multiple-output (MIMO) multi-carrier code division multiple access (MC-CDMA) system to over come the affects of multiple access interference (MAI) caused by other users present in the system. STSIC technique combines the receiver diversity and serial interference cancellation...
