Although tremendous progress has been made on the past years on channel estimation in OFDM systems still it is considered as area of concern in wireless communication. A novel channel estimation technique with virtual sub carriers is proposed in this work namely DFT Based Channel Estimation for OFDM Systems that maintains Complexity-Performance Trade-Offs and with leakage suppression using virt...

The design of cross-layer scheme, which plays a key role in satellite resource management, is crucial for the data transmission in the CCSDS AOS. In this paper, a novel dynamic cross-layer scheme, which satisfies QoS service, is proposed. This scheme can utilize both the applications’ QoS attributes and physical layer channel state information to change virtual channel bandwidth and transmissio...

Covert channels have tmditionally been categorized as either stomge channels or timing channels[6, 71. This paper questions this categorization, and discwses channels that cannot be clearly identified as either stomge or timing channels, but have aspects of both. A new model of timing channels is presented, which allows for channels that have chamcteristics of both stomge channels and timing ch...

This paper investigates differentiated services in wireless packet networks using a fully distributed approach that supports service differentiation, radio monitoring and admission control. While our proposal is generally applicable to distributed wireless access schemes, we design, implement and evaluate our framework within the context of existing wireless technology. Service differentiation ...

In this review article, basic properties of NAND flashmemory cell strings which consist of cells with virtual source/drain (S/D) (or without S/D) were discussed. The virtual S/D concept has advantages of better scalability, less cell fluctuation due to effectively longer channel length at the same technology node, and less program disturbance. The fringing electric field from the control-gate a...

We consider the basic multiple-access communication problem in a distributed setting for both the additive white Gaussian noise channel and the discrete memoryless channel. We propose a scheme called Distributed Rate Splitting to achieve the optimal rates allowed by information theory in a distributed manner. In this scheme, each real user creates a number of virtual users via a power/rate spli...

Virtual worlds (VW) have paved a new and important channel for workplace collaborations. However, analysts have noted that several organizations that made a strong entrance into using VW as a nouveau channel for communication and collaboration are stepping back due to limited user response. Motivated by this fact, we propose a trust-theoretic ‘virtual world collaboration model’ for collaboratio...