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A signal overlay technique employing the empirical mode decomposition procedure is presented here. A weak narrowband signal is added to the primary signal that shares the same frequency band. Careful signal design reduces interference caused to primary users while ensuring successful recovery of the added signal. At the receiver a stationary filtering approach is ineffective in separating the signals...
The transmitted reference ultra-wideband (TR-UWB) scheme has generated considerable interest in the field of UWB radio and on-chip wireless interconnect systems. This paper presents a wideband delay element (WBDE) which is a major design concern for TR-UWB transceivers and introduces a novel WBDE architecture that eliminates the need for dual bipolar power supplies. A very wide range of delays of...
In this paper, we describe an efficient authentication protocol for group communication in hybrid wireless networks with a satellite overlay. The proposed protocol uses a new class of lightweight, symmetric-key certificates called TESLA certificate. The certificates bind the identities of the senders to the anchor elements of their key chains; messages from the senders are authenticated by MACs computed...
Software defined radios (SDR) can be found in every area of wireless signal processing. SDRs realized so far are mostly part of communication technology, including audio broadcast receivers. Image- and video processing in SDRs is not common due to the fact that this type of real-time application requires a huge amount of processing resources. It can be foreseen that SDRs for video processing will...
A suite of structural tests is described that uses on-chip under sampling to measure parameters that affect jitter tolerance in a multi-gigabit-per-second (Gbps) receiver. The tests measure high-frequency jitter (RMS value and histogram) in the received signal and in the recovered clock, plus transition-density dependent phase-shift, mean sampling position in the signal eye, sampling clock phase error,...
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