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CS-MUVI: Video compressive sensing for spatial-multiplexing cameras
(2012)2012 IEEE International Conference on Computational Photography (ICCP)Compressive sensing (CS)-based spatial-multiplexing cameras (SMCs) sample a scene through a series of coded projections using a spatial light modulator and a few optical sensor elements. SMC architectures are particularly useful when imaging at wavelengths for which full-frame sensors are too cumbersome or expensive. While existing recovery algorithms for SMCs perform well for static images, they typically fail for time-varying scenes ...Conference Paper -
Dictionary learning from sparsely corrupted or compressed signals
(2012)2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)In this paper, we investigate dictionary learning (DL) from sparsely corrupted or compressed signals. We consider three cases: I) the training signals are corrupted, and the locations of the corruptions are known, II) the locations of the sparse corruptions are unknown, and III) DL from compressed measurements, as it occurs in blind compressive sensing. We develop two efficient DL algorithms that are capable of learning dictionaries from ...Conference Paper -
PAR-aware multi-user precoder for the large-scale MIMO-OFDM downlink
(2012)2012 International Symposium on Wireless Communication Systems (ISWCS)We consider an orthogonal frequency-division multiplexing (OFDM)-based downlink transmission scheme for large-scale multi-user (MU) multiple-input multiple-output (MIMO) wireless systems. In order to transmit signals with low peak-to-average (power) ratio (PAR), we propose to exploit the massive degrees-of-freedom available in large-scale MU-MIMO-OFDM systems. Specifically, we jointly perform MU precoding, OFDM modulation, and PAR reduction ...Conference Paper -
VLSI Implementation of Hard- and Soft-Output Sphere Decoding for Wide-Band MIMO Systems
(2012)IFIP Advances in Information and Communication Technology ~ VLSI-SoC: Forward-Looking Trends in IC and Systems Design 18th IFIP WG 10.5/IEEE International Conference on Very Large Scale Integration, VLSI-SoC 2010, Madrid, Spain, September 27-29, 2010, Revised Selected PapersConference Paper -
Signal Representations with Minimum l∞ -Norm
(2012)2012 50th Annual Allerton Conference on Communication, Control, and Computing (Allerton)Maximum (or ℓ∞ ) norm minimization subject to an underdetermined system of linear equations finds use in a large number of practical applications, such as vector quantization, peak-to-average power ratio (PAPR) (or “crest factor”) reduction in wireless communication systems, approximate neighbor search, robotics, and control. In this paper, we analyze the fundamental properties of signal representations with minimum ℓ∞ -norm. In particular, ...Conference Paper -
Layered detection and decoding in MIMO wireless systems
(2012)Proceedings of the 2012 Conference on Design and Architectures for Signal and Image ProcessingIterative detection and decoding (IDD) in multiple-input multiple-output (MIMO) wireless systems is known to achieve near channel capacity. The high computational complexity of IDD, however, poses significant challenges for practical implementations (in terms of circuit area, latency, throughput, and power consumption). While the implementation of the involved detector and decoder circuits have received attention in the literature, only ...Conference Paper