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On codes with spectral nulls at rational submultiples of the symbol frequency
 IEEE Trans. Inform. Theory
, 1987
"... AbstractIn digital data transmission (respectively, storage systems), line codes (respectively, recording codes) are used to tailor the spectrum of the encoded sequences to satisfy constraints imposed by the channel transfer characteristics or other system requirements. For instance, pilot tone ins ..."
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Cited by 4 (0 self)
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insertion requires codes with zero mean and zero spectral density at tone frequencies. Embedded tracking/focus servo signals produce similar needs. Codes are studied with spectral nulls at frequencies f = kf, /n, where f, is the symbol frequency and k, n are relatively prime integers with k I n; in other
Mathematical Document Classification via Symbol Frequency Analysis
"... Abstract. Earlier work has examined the frequency of symbol and expression use in mathematical documents for various purposes including mathematical handwriting recognition and forming the most natural output from computer algebra systems. This work has found, unsurprisingly, that the particulars of ..."
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Cited by 6 (2 self)
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Abstract. Earlier work has examined the frequency of symbol and expression use in mathematical documents for various purposes including mathematical handwriting recognition and forming the most natural output from computer algebra systems. This work has found, unsurprisingly, that the particulars
Spacetime codes for high data rate wireless communication: Performance criterion and code construction
 IEEE TRANS. INFORM. THEORY
, 1998
"... We consider the design of channel codes for improving the data rate and/or the reliability of communications over fading channels using multiple transmit antennas. Data is encoded by a channel code and the encoded data is split into n streams that are simultaneously transmitted using n transmit ant ..."
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Cited by 1779 (28 self)
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antennas. The received signal at each receive antenna is a linear superposition of the n transmitted signals perturbed by noise. We derive performance criteria for designing such codes under the assumption that the fading is slow and frequency nonselective. Performance is shown to be determined by matrices
Robust frequency and timing synchronization for OFDM
 IEEE Transactions on Communications
, 1997
"... Abstract — A rapid synchronization method is presented for an orthogonal frequencydivision multiplexing (OFDM) system using either a continuous transmission or a burst operation over a frequencyselective channel. The presence of a signal can be detected upon the receipt of just one training sequen ..."
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Cited by 388 (0 self)
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sequence of two symbols. The start of the frame and the beginning of the symbol can be found, and carrier frequency offsets of many subchannels spacings can be corrected. The algorithms operate near the Cramér–Rao lower bound for the variance of the frequency offset estimate, and the inherent averaging
Symbols
, 1995
"... AOA angle of attack, deg bk transfer function denominator polynomial coefficients, k = 12, CA snubber circuit capacitance, F CF feedback network rolloff capacitance, F CL load capacitance, F D discriminant DAS data acquisition system DC denotes constant voltage DVM digital voltmeter Ei Laplace tran ..."
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/output circuit TU transfer function of uncompensated filter x variable τ A τ F τ L τ1, τ2 ω 0 time constant of snubber circuit, sec time constant of uncompensated filter output circuit, sec time constant of uncompensated unitygain buffer circuit, sec time constants of operational amplifier, sec frequency
Symbols
, 1488
"... Locate your area of interest on the "I ndex to Map Sheets If (the last page of this publication). Locate your area of interest on the map sheet. List the mapping unit symbols that are in your area. ..."
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Locate your area of interest on the "I ndex to Map Sheets If (the last page of this publication). Locate your area of interest on the map sheet. List the mapping unit symbols that are in your area.
Symbols
"... Fano’s inequality has proven to be one important result in Shannon’s information theory having found applications in innumerous proofs of convergence. It also provides us with a lower bound on the symbol error probability in a communication channel, in terms of Shannon’s definitions of entropy and m ..."
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Fano’s inequality has proven to be one important result in Shannon’s information theory having found applications in innumerous proofs of convergence. It also provides us with a lower bound on the symbol error probability in a communication channel, in terms of Shannon’s definitions of entropy
Symbol
"... The General Conference of Weights and Measures has classified the SI units, radian and steradian, listed in table 1, as supplementary units, leaving open the question of whether they are base units or derived units, and consequently the question of whether plane angle and solid angle are to be con ..."
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The General Conference of Weights and Measures has classified the SI units, radian and steradian, listed in table 1, as supplementary units, leaving open the question of whether they are base units or derived units, and consequently the question of whether plane angle and solid angle are to be considered as base quantities or derived quantities (1).
Symbols
"... Flashing induced instabilities in a BWR testfacility (CIRCUS) have been investigated. A steadystate model of the thermohydraulic behavior of a simplified natural circulation cooled BWR setup has been derived. An asymmetric power distribution in the core leads to asymmetric boifing boundaries in ..."
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Flashing induced instabilities in a BWR testfacility (CIRCUS) have been investigated. A steadystate model of the thermohydraulic behavior of a simplified natural circulation cooled BWR setup has been derived. An asymmetric power distribution in the core leads to asymmetric boifing boundaries in the core and small differences in flowrate in the corechannels. However, the natural circulation is mainly driven by density differences between the riser section and the downcomer section, keeping the differences in flowrate small. The time dependent flowrate in the corechannels has been measured by means of LDA during unstable conditions of the CIRCUS facility, a steamwater simulator operating at 1.2 bar. Various asymmetric power distributions (leading to a difference in specific energy at the core exit up to 1 M J / k g) have been studied under several core inlet temperatures, ranging from 98°C 102°C. Increasing inlet temperature and total power leads to a destabilizing of CIRCUS at the particular points measured. Increasing asymmetry in power distribution leads to increasing flowrate differences between the two core channels measured. The steadystate simulations overestimate the experiments, but the trends in flowrate at increasing inlet temperature and total power are similar. i
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"... Hydrates in some crude oils have a smaller tendency to form plugs than in others, and lately this is becoming a focus of research. To study this and the action of hydrate antiagglomerants in general, hydrate surface properties must be known. To help in characterizing the surface properties by simula ..."
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Hydrates in some crude oils have a smaller tendency to form plugs than in others, and lately this is becoming a focus of research. To study this and the action of hydrate antiagglomerants in general, hydrate surface properties must be known. To help in characterizing the surface properties by simulation, the capillary waves of clathrate hydrate surfaces in vacuum is examined in all unique crystal faces by Molecular Dynamics, and an attempt is made to estimate the surface energies in the respective crystal faces from the wave fluctuations [1]. We also attempt to estimate solid/liquid surface energies of hydrate/oil and hydrate/water for a specific face, for comparison. The forcefield OPLS_AA is used for the organic compounds, while TIP4P/ice is used for the water framework. The anisotropy of the surface energy is then estimated and the result compared to the initial growth rate of different crystal faces as found in experiment. [2]
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