In this paper, we present the performance of different broadcast schemes for multihop sensor networks based on mathematical modeling. In near future many applications will demand multicast (Broadcast) communication feature from the sensor networks. This broadcast feature does not use virtual carrier sensing but relies on physical carrier sensing to reduce collision. For this paper, we analyze t...

This thesis explores three distinct philosophies for improving the efficiency of multi-carrier communication on the digital subscriber loop. The first topic discussed is impulse response shortening for discrete multitone transceivers. The minimum mean-squared error impulse response shortener is reformulated to allow near-optimal rate performance. It is demonstrated that the best existing eigen-...

Wireless communication systems are tending towards progressive data transfer over a long range of transmission. With the raise in required quality of services, the allocation of the available resource is to be maintained efficiently. A load matrix approach for multi cellular architecture is proposed, which allocate the communication power based on channel estimated SINR. The allocation of power...

In recent years, the demands for reliable high rate multimedia and data transmission in wireless communications have increased tremendously. Multi-antenna and multi-carrier communications provide both theoretically attractive and technically practical solutions to satisfy these requirements. This thesis aims at designing and studying advanced algorithms for multi-antenna and multi-carrier commu...

Orthogonal frequency division multiplexing (OFDM) communications in the presence of motion is investigated using data collected from the Kauai Acomms MURI 2008 (KAM08) experiment, conducted off the western side of Kauai, Hawaii, in June-July 2008. The experiment involved a vertical array moored in 106 m deep shallow water and a source towed at a speed of 3 knots at ranges between 600 m and 6 km...

Utilization of chaotic signals for covert communications remains a very promising practical application. Multiple studies indicate that the major shortcoming of recently proposed chaos-based communication schemes is their susceptibility to noise and distortions in communication channels. In this paper, we review a new approach to communication with chaotic signals, which demonstrates good perfo...