The reliability and the cost of electronic circuits are closely connected to the maximum power dissipated by them. Tools for evaluating the worst case power consumption of sequential circuits is becoming a primal concern for designers of low-power circuits. In the paper the task of estimation of peak sustainable power for CMOS synchronous sequential circuit is considered when its automaton desc...

Broadband multicarrier communication suffers from a large signal span, causing problems in both wireless and wireline systems. This is commonly referred to as a high peak to average ratio (PAR), and leads to a high power consumption, which is an important limitation inmany communication systems. This thesis puts focus on PAR reduction for wireline communication systems, in particular for the mu...

I certify that the work submitted is my own and that any material derived or quoted from the published or unpublished work of other persons has been duly acknowledged (ref. UPR AS/C/6.1, Appendix I, Section 2 – section on cheating and plagiarism) Abstract Emerging wireless systems envisage properties of; power and bandwidth efficiency, low cost transceivers (to encourage more users) and increas...

1.55-μm pulses with up to 12.5-mJ energy are generated from a four-stage KTPOPCPA and recompressed to 79 fs. By focusing these pulses into a noble-gas cell, we demonstrate single 4-mJ supercontinuum filaments supporting 8-fs pulses. ©2009 Optical Society of America OCIS codes: (320.7110) Ultrafast nonlinear optics; (190.4970) Parametric oscillators and amplifiers. The current quest for generati...

The Peak to Average Power Ratio (PAPR) is currently viewed as an important implementation issue in communication systems. Specifically, for wireless cellular systems the price of the mobile unit is required to remain low. This means that a limited PAPR can be supported. Orthogonal Frequency Division Multiplexing (OFDM) and Single Carrier (SC) are the prominent candidates for the next generation...

Orthogonal Frequency Division Multiplexing (OFDM) is one of the modulation techniques used in digital video broadcasting systems. A significant disadvantage of OFDM is that it has a high peak-to-average power ratio (PAPR). This means that the output amplifiers of digital television transmitters must be designed to handle signals that are far in excess of the mean levels. These amplifiers are ex...

Selected mapping (SLM) peak–power reduction [1] is distortionless as it selects the actual transmit signal from a set of alternative signals, which all represent the same information. Usually, the specific signal generation information needs to be transmitted and carefully protected against bit errors. Here, we propose an extension of SLM, which employs scrambling and refrains from transmitting...

The transmit signals in an OFDM system can have high peak values in the time domain since many subcarrier components are added via an IFFT operation. Therefore, OFDM systems are known to have a high PAPR (Peak-to-Average Power Ratio), compared with single-carrier systems. In fact, the high PAPR is one of the most detrimental aspects in the OFDM system, as it decreases the SQNR (Signal-to-Quanti...

This paper is devoted to the spectral analysis of the magnetic Neumann Laplacian on an infinite cone of aperture α. When the magnetic field is constant and parallel to the revolution axis and when the aperture goes to zero, we prove that the first n eigenvalues exist and admit asymptotic expansions in powers of α.

For the purpose of aiding upper-level strategic or political decision making and some forms of conflict management, this chapter revisits the concept of dialectical inquiry (DI) from the perspective of collaborative framing or modeling for “collaboration engineering.” It does so by integrating the recent literature with its theoretical and philosophical sources. The connection of DI and the pro...