Papers by Massimiliano Siti
Eurasip Journal on Wireless Communications and Networking, 2012
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Recently a soft-output multiple-input multiple-output (MIMO) detector has been proposed, namely L... more Recently a soft-output multiple-input multiple-output (MIMO) detector has been proposed, namely LORD (layered orthogonal lattice detector), able to achieve maximum-likelihood (ML) performance (in the max-log sense) for two transmit antennas, and near-optimal for greater than two, in MIMO-OFDM bit interleaved coded modulation (BICM) systems. This paper presents a near-optimal layer ordering technique applicable to the hard-output version of the algorithm, essential to achieve near-ML performance up to high-dimensional MIMO systems. The Euclidean distance metrics are minimized over a constant number of transmit sequences, a property desirable to maintain constant throughput and not guaranteed by the most known sphere decoder. Differently from previous art works, attention is also paid to the optimization of the implementation complexity. Finally, it is also shown how the above mentioned ordering technique should be modified for the soft-output version of the algorithm, significantly improving the performance of MIMO-OFDM BICM systems. Simulations in the realistic context of next generation WLANs (802.11n) confirm this statement.
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Page 1. A K-Best version of the Turbo-LORD MIMO Detector in Realistic Settings Alessandro Tomason... more Page 1. A K-Best version of the Turbo-LORD MIMO Detector in Realistic Settings Alessandro Tomasoni ∗ , Massimiliano Siti , Marco Ferrari and Sandro Bellini ∗ ∗ Politecnico di Milano, Milan, Italy, Email: firstname.secondname ...
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IEEE Transactions on Wireless Communications, Oct 1, 2010
We propose a novel family of Soft-Input Soft-Output detectors for iterative, point-to-point, MIMO... more We propose a novel family of Soft-Input Soft-Output detectors for iterative, point-to-point, MIMO receivers. Compared to the optimal Maximum A Posteriori receiver, low complexity is achieved restricting the detector search to small subsets of the entire QAM hyper-symbol constellation, through simple criteria. These criteria are applied to an improved version of the non-iterative Layered ORthogonal lattice Detector. We show that,
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The authors develop a generalized layered orthogonal lattice detector (G-LORD) for the golden cod... more The authors develop a generalized layered orthogonal lattice detector (G-LORD) for the golden code. G-LORD includes the previously developed LORD algorithm and exhaustive search ML detection as special cases, and is proved to achieve the perfect balance between error performance and complexity. Meanwhile, G-LORD is suitable for parallel implementations, and has a deterministic complexity as opposed to the sphere decoder approach. Thanks to the special structure of the golden code, G-LORD can implement the optimal ordering with very low complexity. Most importantly, G-LORD can efficiently generate bit soft-output metric when golden code is concatenated with outer channel code. The development of G-LORD boosts the practical application of the golden code.
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IEEE Transactions on Wireless Communications, Mar 1, 2013
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The performance of a Reed-Solomon (RS) code has an analytical expression if the errors at the inp... more The performance of a Reed-Solomon (RS) code has an analytical expression if the errors at the input of the decoder are independent. In concatenated schemes, this condition is often obtained through an interleaving device disrupting the correlation between erroneous symbols. Sometimes the ideal depth of such interleaver is too large to implement, and the RS decoder must operate in suboptimal
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... PER ML LORD full complexity LORD S=5, Plc=5 LORD S=4, Plc=4 SPHERE (K=28) SPHERE (K=12) MMSE ... more ... PER ML LORD full complexity LORD S=5, Plc=5 LORD S=4, Plc=4 SPHERE (K=28) SPHERE (K=12) MMSE Fig. 6. Detectors performance for a MIMO system with Nt = Nr = 2, Rc = 2/3 and 64-QAM (8 bit/carrier), with ideal and realistic channel conditions (dashed an solid lines ...
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2006 IEEE International Conference on Communications, 2006
This paper presents a soft-output lattice detector algorithm for multiple-input multiple-output (... more This paper presents a soft-output lattice detector algorithm for multiple-input multiple-output (MIMO) communications called layered orthogonal lattice detector (LORD). LORD adopts a new lattice formulation and relies on a channel orthogonalization process. Building on the optimality of LORD for two transmit antennas this paper is a generalization of the algorithm to any number of transmit antennas. The most interesting aspect
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European Transactions on Telecommunications, 2007
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arXiv (Cornell University), Mar 24, 2006
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arXiv (Cornell University), Aug 12, 2005
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Design, Automation, and Test in Europe, Mar 8, 2010
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In this paper a novel Soft-Input Soft-Output detector, namely Turbo-LORD, is proposed for iterati... more In this paper a novel Soft-Input Soft-Output detector, namely Turbo-LORD, is proposed for iterative MIMO receivers. This is an improved version, capable of managing a priori information, of the Layered ORthogonal lattice Detector recently presented. The implementation is straight and efficient when there are only two transmitting antennas. However, problems arising with more than two antennas are also discussed, along
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European Transactions on Telecommunications, 2007
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EURASIP Journal on Wireless Communications and Networking, 2012
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GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270), 2001
The performance of a Reed-Solomon (RS) code has an analytical expression if the errors at the inp... more The performance of a Reed-Solomon (RS) code has an analytical expression if the errors at the input of the decoder are independent. In concatenated schemes, this condition is often obtained through an interleaving device disrupting the correlation between erroneous symbols. Sometimes the ideal depth of such interleaver is too large to implement, and the RS decoder must operate in suboptimal
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A novel detector for multiple-input multiple-output (MIMO) communications is presented. The algor... more A novel detector for multiple-input multiple-output (MIMO) communications is presented. The algorithm belongs to the class of the lattice detectors, i.e. it finds a reduced complexity solution to the problem of finding the closest vector to the received observations. The algorithm achieves optimal maximum-likelihood (ML) performance in case of two transmit antennas, at the same time keeping a complexity much lower than the exhaustive search-based ML detection technique. Also, differently from the state-of-art lattice detector (namely sphere decoder), the proposed algorithm is suitable for a highly parallel hardware architecture and for a reliable bit soft-output information generation, thus making it a promising option for real-time high-data rate transmission.
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Papers by Massimiliano Siti