Tools
Sorted by:
Try your query at:
 |
 |
 |
 |
 |
 |
Results 1 - 10
of
8,210
Does excess quantum noise exist in spontaneous processes?
"... Abstract We investigate the role of excess quantum noise in type-II degenerate parametric down-conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside th ..."
Abstract
- Add to MetaCart
Abstract We investigate the role of excess quantum noise in type-II degenerate parametric down-conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside
Good Error-Correcting Codes based on Very Sparse Matrices
, 1999
"... We study two families of error-correcting codes defined in terms of very sparse matrices. "MN" (MacKay--Neal) codes are recently invented, and "Gallager codes" were first investigated in 1962, but appear to have been largely forgotten, in spite of their excellent properties. The ..."
Abstract
-
Cited by 750 (23 self)
- Add to MetaCart
. The decoding of both codes can be tackled with a practical sum-product algorithm. We prove that these codes are "very good," in that sequences of codes exist which, when optimally decoded, achieve information rates up to the Shannon limit. This result holds not only for the binary-symmetric channel
Space-time block codes from orthogonal designs
- IEEE Trans. Inform. Theory
, 1999
"... Abstract — We introduce space–time block coding, a new paradigm for communication over Rayleigh fading channels using multiple transmit antennas. Data is encoded using a space–time block code and the encoded data is split into � streams which are simultaneously transmitted using � transmit antennas. ..."
Abstract
-
Cited by 1524 (42 self)
- Add to MetaCart
. The received signal at each receive antenna is a linear superposition of the � transmitted signals perturbed by noise. Maximumlikelihood decoding is achieved in a simple way through decoupling of the signals transmitted from different antennas rather than joint detection. This uses the orthogonal structure
A simple distributed autonomous power control algorithm and its convergence
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
, 1993
"... For wireless cellular communication systems, one seeks a simple effective means of power control of signals associated with randomly dispersed users that are reusing a single channel in different cells. By effecting the lowest interference environment, in meeting a required minimum signal-to-interf ..."
Abstract
-
Cited by 477 (3 self)
- Add to MetaCart
power level of each of the signals, using only local measurements, so that eventually all users meet the p requirement. The local per channel power measurements include that of the intended signal as well as the undesired interference from other users (plus receiver noise). For a certain simple
Gaussian interference channel capacity to within one bit
- 5534–5562, 2008. EURASIP Journal on Advances in Signal Processing
"... Abstract—The capacity of the two-user Gaussian interference channel has been open for 30 years. The understanding on this problem has been limited. The best known achievable region is due to Han and Kobayashi but its characterization is very complicated. It is also not known how tight the existing o ..."
Abstract
-
Cited by 452 (28 self)
- Add to MetaCart
Abstract—The capacity of the two-user Gaussian interference channel has been open for 30 years. The understanding on this problem has been limited. The best known achievable region is due to Han and Kobayashi but its characterization is very complicated. It is also not known how tight the existing
Implementation issues in spectrum sensing for cognitive radios
- in Proc. the 38th. Asilomar Conference on Signals, Systems, and Computers
, 2004
"... Abstract- There are new system implementation challenges involved in the design of cognitive radios, which have both the ability to sense the spectral environment and the flexibility to adapt transmission parameters to maximize system capacity while co-existing with legacy wireless networks. The cri ..."
Abstract
-
Cited by 440 (7 self)
- Add to MetaCart
Abstract- There are new system implementation challenges involved in the design of cognitive radios, which have both the ability to sense the spectral environment and the flexibility to adapt transmission parameters to maximize system capacity while co-existing with legacy wireless networks
The stochastic heat equation with fractional-colored noise: existence of the solution.
- Latin Amer. J. Probab. Math. Stat.
, 2008
"... Abstract. In this article we consider the stochastic heat equation ut − ∆u =Ḃ in (0, T ) × R d , with vanishing initial conditions, driven by a Gaussian noiseḂ which is fractional in time, with Hurst index H ∈ (1/2, 1), and colored in space, with spatial covariance given by a function f . Our main ..."
Abstract
-
Cited by 19 (13 self)
- Add to MetaCart
result gives the necessary and sufficient condition on H for the existence of the process solution. When f is the Riesz kernel of order α ∈ (0, d) this condition is H > (d − α)/4, which is a relaxation of the condition H > d/4 encountered when the noiseḂ is white in space. When f is the Bessel
Covariance Structure Maximum Likelihood Estimates in Compound Gaussian Noise : Existence and Algorithm Analysis”, under review at
- IEEE Trans.-SP
"... Abstract—Recently, a new adaptive scheme [Conte et al. (1995), Gini (1997)] has been introduced for covariance structure matrix estimation in the context of adaptive radar detection under non-Gaussian noise. This latter has been modeled by compound-Gaussian noise, which is the product c of the squar ..."
Abstract
-
Cited by 82 (37 self)
- Add to MetaCart
is the exact maximum-likelihood (ML) estimate of the noise covariance structure, while when is a positive random variable, the FP is an approximate maximum likelihood (AML). This estimate has been already used for its excellent statistical properties without proofs of its existence and uniqueness. The major
Estimating three-dimensional motion parameters of a rigid planar patch, III: Finite point correspondences and three-view problem
- in Proc. IEEE Int. Conf ASSP
"... noise electron tubes, and superconductive parametric and storage devices. In 1965 he performed an experiment which first proved the existence of the Magnus force in superconductors and was a co-recip-ient of the RCA Research Award for the development of a supercon-ductive parametric amplifier. In 19 ..."
Abstract
-
Cited by 398 (3 self)
- Add to MetaCart
noise electron tubes, and superconductive parametric and storage devices. In 1965 he performed an experiment which first proved the existence of the Magnus force in superconductors and was a co-recip-ient of the RCA Research Award for the development of a supercon-ductive parametric amplifier
The curvelet transform for image denoising
- IEEE TRANS. IMAGE PROCESS
, 2002
"... We describe approximate digital implementations of two new mathematical transforms, namely, the ridgelet transform [2] and the curvelet transform [6], [5]. Our implementations offer exact reconstruction, stability against perturbations, ease of implementation, and low computational complexity. A cen ..."
Abstract
-
Cited by 404 (40 self)
- Add to MetaCart
, and implements curvelet subbands using a filter bank of à trous wavelet filters. Our philosophy throughout is that transforms should be overcomplete, rather than critically sampled. We apply these digital transforms to the denoising of some standard images embedded in white noise. In the tests reported here
Results 1 - 10
of
8,210
