A transform coding method for coding higher layers of a multi-layer embedded speech and audio coding system using factorial pulse codebook is proposed. The proposed methods use frequency selective attenuation of lower layer output to reduce the spurious noise generated when speech model based coding method is used in lower layers for coding of the nonspeech signals. The frequency selective atte...

This paper investigates the interaction between network coding and link-layer transmission rate diversity in multi-hop wireless networks. By appropriately mixing data packets at intermediate nodes, network coding allows a single multicast flow to achieve higher throughput to a set of receivers. Broadcast applications can also exploit link-layer rate diversity, whereby individual nodes can trans...

Adapting the transmission rate in an LMS channel is a challenging task because of the relatively fast time variations, of the long delays involved, and of the difficulty in mapping the parameters of a time-varying channel into communication performance. In this paper, we propose two strategies for dealing with these impairments, namely, multi-layer coding (MLC) in the forward link, and open-loo...

This research investigates cross-layer design in multi-hop wireless networks with random access. Due to the complexity of the problem, we study cross-layer design with a simple slotted ALOHA medium access control (MAC) protocol without considering any network dynamics. Firstly, we study the optimal joint configuration of routing and MAC parameters in slotted ALOHA based wireless networks under ...

it has been demonstrated that anxiety is accompanied by significant warm up in the periorbital area. this warm up was attributed to the increased blood circulation in the area around the eyes. the whole pattern makes physiological and evolutionary sense since it represents a mechanism to facilitate rapid eye movements during preparedness for fight. this increased blood flow dissipates convectiv...

This paper concerns the transmission of two independent Gaussian sources over a two-user decentralized interference channel, assuming that the transmitters are unaware of the instantaneous CSIs. The availability of the channel state information at receivers (CSIR) is considered in two scenarios of perfect and imperfect CSIR. In the imperfect CSIR case, we consider a more practical assumption of...

This paper proposes a multi-layer super-wideband embedded speech and audio coding algorithm extending bit rates from 36 to 64 kb/s on the basis of ITU-T Recommendation G.729.1 with a multi-stage coding structure. This codec consists of three embedded stages: G.729.1 wideband coding operating in the range from 8 to 32 kb/s, modified Modulated Lapped Transform (MLT) coding of the band (7-14 kHz) ...

Title of dissertation: MEDIUM ACCESS CONTROL AND NETWORK CODING FOR WIRELESS INFORMATION FLOWS Yalin Evren Sagduyu, Doctor of Philosophy, 2007 Dissertation directed by: Professor Anthony Ephremides Department of Electrical and Computer Engineering This dissertation addresses the intertwined problems of medium access control (MAC) and network coding in ad hoc wireless networks. The emerging wire...