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—A Probabilistic Data Association (PDA) method is proposed in this letter for multiuser detection over synchronous code-division multiple-access (CDMA) communication channels. PDA models the undecided user signals as binary random variables. By approximating the inter-user interference (IUI) as Gaussian noise with an appropriately elevated covariance(More)
—In this paper, we present various channel estimators that exploit the channel sparsity in a multicarrier underwater acoustic system, including subspace algorithms from the array precessing literature, namely root-MUSIC and ESPRIT, and recent compressed sensing algorithms in form of Orthogonal Matching Pursuit (OMP) and Basis Pursuit (BP). Numerical(More)
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—In decentralized detection, local sensor observations have to be communicated to a fusion center through the wireless medium, inherently a multiple-access channel (MAC). As communication is bandwidth-and energy-constrained, it has been suggested to use the properties of the MAC to combine the sensor observations directly on the channel. Although this leads(More)
—Recently, a power-law statistic operating on discrete Fourier transform (DFT) data has emerged as a basis for a remarkably robust detector of transient signals having unknown structure, location, and strength. In this paper, we offer a number of improvements to Nuttall's original power-law detector. Specifically, the power-law detector requires that its(More)
—Two new algorithms are presented for the segmenta-tion of a white Gaussian-distributed time series having unknown but piecewise-constant variances. The first " sequential/minimum description length (MDL) " idea includes a rough parsing via the GLR, a penalization of segmentations having too many parts via MDL, and an optional refinement stage. The second "(More)
— In this paper, we propose to use nonbinary low density parity check (LDPC) codes to address two main issues in underwater acoustic OFDM communication: i) plain OFDM has poor performance in the presence of channel fading, and ii) OFDM transmission has a high peak-to-average-power ratio (PAPR). We propose new methods to construct nonbinary irregular LDPC(More)
—An algorithm that is capable not only of tracking multiple targets but also of " track management " – meaning that it does not need to know the number of targets as a user input – is of considerable interest. In this paper we devise a recursive track-managed filter via a quantized state-space (" bin ") model. In the limit, as the discretization implied by(More)