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— In this paper, a group of low-complexity subspace tracking based pilot-aided channel estimation methods for orthogonal frequency-division multiplexing (OFDM) systems is studied. These methods are based on a parametric channel model where the channel response is characterized as a collection of sparse propagation paths. Considering the slow variations of(More)
This paper discusses the feasibility of embedding a bit map image (BMP file) into the relational databases for protecting data's copyrights and the term of WDI (Watermarking Databases using Image) is proposed. An error correction approach of BCH (Bose-Chaudhuri-Hocquenhem) coding is used for enhancing the robustness of the algorithms. And a Trusted Third(More)
Optical networks [1] have emerged as a promising candidate for next-generation networks providing high-channel bandwidth and low-communication latency. It is the essential requirement for next-generation networks to provide Quality of Service (QoS) [2] and multicast [3] capabilities. Hence, we need to address the issue of QoS multicast in optical networks.(More)