Maitane Barrenechea

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A fixed-throughput Wiener filter vector precoding (VP) approach specially suitable for hardware implementation in field programable gate array (FPGA) devices is introduced in this paper. The lattice decoding algorithm, which is based on the sphere decoder (SD) lattice search, performs in its first stage a reordering of the matrix to be used for the tree(More)
In recent years the interest in developing efficient algorithms for the multiple-input multiple-output (MIMO) broadcast channel has arisen. Vector precoding (VP) techniques have shown very promising performance results, but the perturbation process inherent in these type of non-linear systems hinders their efficient implementation. The key to achieving a(More)
The development of a fingerprint verification system on a low-cost embedded platform is an open issue in nowadays biometrics. Our paper describes a low-cost fingerprint minutiae extraction and matching system based on a Spartan3 family FPGA with an embedded Leon2 open core processor. The proposed system architecture incorporates a floating point unit and a(More)
In the multiuser MIMO broadcast channel, the use of precoding techniques is required in order to detect the signal at the users' terminals without any cooperation between them. This contribution presents the design and hardware implementation of a high-capacity precoder based on vector perturbation. The most challenging part of the vector precoding (VP)(More)
A two-hop non-regenerative multiuser multiple input multiple output (MIMO) relaying scenario is analysed in this paper, where the main design challenge resides in the selection of the interdependent precoding and relaying matrices. Several linear and non-linear approaches have been proposed for amplify-and-forward (AF) relaying, the best performance being(More)
In this paper we consider the design of minimum mean square error (MMSE) transceivers for non-regenerative multiuser multiple-input multiple-output (MIMO) relay systems, where the main challenge resides in the joint optimal design of the precoder to be used at the base station and the relaying algorithms. We propose the use of non-linear precoding(More)
Precoding techniques are used in the downlink of multiuser multiple-input multiple-output (MIMO) systems in order to separate the information data streams aimed at scattered user terminals. Vector precoding (VP) is one of the most promising non-linear precoding schemes, which achieves a performance close to the optimum albeit impractical dirty paper coding(More)