Donald C. Cox

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A rapid synchronization method is presented for an orthogonal frequency-division multiplexing (OFDM) system using either a continuous transmission or a burst operation over a frequency-selective channel. The presence of a signal can be detected upon the receipt of just one training sequence of two symbols. The start of the frame and the beginning of the(More)
Orthogonal frequency-division multiplexing (OFDM) is robust against frequency selective fading due to the increase of the symbol duration. However, for mobile applications channel time-variations in one OFDM symbol introduce intercarrier-interference (ICI) which degrades the performance. This becomes more severe as mobile speed, carrier frequency or OFDM(More)
This paper tests for the motives for private income transfers. We consider two motives: altruism and exchange. The question of private-transfer motives is important because such motivation can influence the effects of public income transfers on the distribution of income. Using a household survey for Peru, we find that transfer amounts received increase(More)
Handoo is the procedure by which a user's radio link is transferred between radio ports in the network without an interruption of the user connection. In this paper , we discuss how a Wireless Asynchronous Transfer Mode (ATM) network may reroute a user connection during a handoo. We propose a novel procedure called \Nearest Common Node Rerouting (NCNR)."(More)
BACKGROUND We have developed a gene expression assay (Whole-Genome DASL), capable of generating whole-genome gene expression profiles from degraded samples such as formalin-fixed, paraffin-embedded (FFPE) specimens. METHODOLOGY/PRINCIPAL FINDINGS We demonstrated a similar level of sensitivity in gene detection between matched fresh-frozen (FF) and FFPE(More)
tions has captured the attention of the media, and with it, the imagination of the public. Hardly a week goes by without one seeing an article on the subject appearing in a popular U.S. newspaper or magazine. Articles ranging from a short paragraph to many pages regularly appear in local newspapers, as well as in nationwide print media, e.g., The Wall(More)
This letter addresses the effect of timing synchronization errors that are introduced by an erroneous detection of the start of an orthogonal frequency-division multiplexing (OFDM) symbol.1 Such errors degrade the performance of an OFDM receiver by introducing intercarrier interference (ICI) and intersymbol interference (ISI). They can occur due to either(More)
In recent years there has been burgeoning interest in how private transfers respond to household income, or ‘‘transfer derivatives’’. Much of it is fueled by the specter of ‘‘crowding out’’: the more responsive are private transfers, the more likely they could be supplanted by expansions in public transfers, weakening or destroying the latter’s distributive(More)