Comparison of Different Transmit Diversity Space- Time Code Algorithms (2007)
Roger Gaspa, Javier R. Fonollosa
Abstract. Recently, it has been proven that employing more than one transmit antenna increases channel throughput, and different strategies have been developed in order to achieve transmit diversity...
Adaptive Modulation schemes for MIMO HSDPA (2007)
Javier R Fonollosa, Markku Heikkilä, Xavier Mestre, Alba Pagès, Adam Pollard, Laurent Schumacher, ...
There is a growing interest in the standardisation of Multiple Input Multiple Output (MIMO) schemes for High Speed Downlink Packet Access (HSDPA) for future releases of UMTS. The I-METRA project,...
Xavier Mestre, Student Member, Javier R. Fonollosa, Senior Member
Abstract—This paper proposes a spatial filtering technique for the reception of pilot-aided multirate multicode direct-sequence code division multiple access (DS/CDMA) systems such as wideband CDMA...
METRA Project Results: TDD Mode of UTRA * (2007)
Roger Gaspa, Javier R. Fonollosa
Employment of multi-element antenna arrays at both transmit and receive sites is capable of enormous theoretical capacity over wireless communication systems. In this paper we present performance...
Turbo linear dispersion space time coding for (2007)
Ami Wiesel, Luis Garcia, Josep Vidal, Alba Pagès, Javier R. Fonollosa
(LDC) space time codes in the High Speed Downlink Packet Access (HSDPA) service of UMTS. A high rate, multiple input multiple output (MIMO) system using multiple codes, as well as channel coding and...
Turbo equalization and demodulation of multicode space time codes (2007)
Ami Wiesel, Xavier Mestre, Alba Pagès, Javier R. Fonollosa
Abstract — This work considers a high rate, multiple input multiple output (MIMO) system using multiple codes, as well as channel coding and space time (ST) coding. The transmitter consists of a...
Efficient Implementation of Sphere Demodulation (2003)
Ami Wiesel, Xavier Mestre, Alba Pagés, Javier R. Fonollosa
We provide new results on the sphere demodulator (SD) and its new variant, the list sphere demodulator (LSD). A new reduced complexity SD algorithm is presented. We suggest to implement the necessary...
Spatial Filtering for Pilot-Aided WCDMA Systems: A Semi-Blind Subspace Approach (2003)
X. Mestre, J. Fonollosa, Xavier Mestre, Student Member, Javier R. Fonollosa, Senior Member
trellis codes for correlated channels
Evaluation Under Correlated, Xavier Mestre, Student Member, Javier R. Fonollosa, Senior Member, Alba Pagès-zamora
This paper investigates the asymptotic uniform power allocation capacity of frequency nonselective multiple-input multiple-output channels with fading correlation at either the transmitter or the...
ML Approaches to Channel Estimation for Pilot-Aided Multirate DS/CDMA Systems (2002)
Xavier Mestre, Student Member, Javier R. Fonollosa, Senior Member
This paper analyzes the asymptotic performance of maximum likelihood (ML) channel estimation algorithms in wideband code division multiple access (WCDMA) scenarios. We concentrate on systems with...
Carles Anton-Haro, Javier R. Fonollosa, Claudi Fauli, Javier R. Fonollosa
In this paper, the theory of hidden Markov models (HMM) is applied to the problem of blind (without training sequences) channel estimation and data detection. Within a HMM framework, the Baum--Welch...
Channel Capacity of Space-Time Block Coding (2001)
Hector Carrasco Espinosa, Javier R. Fonollosa
Multiple-element transmit and receive antennas have shown very promising results for improved bit error rate and spectral efficiency. Space-Time Block Coding (STBC) is one of the remarkable...
Probabilistic Algorithms for Blind Adaptive Multiuser Detection (1998)
Carles Anton-Haro, Student Member, Javier R. Fonollosa, Zoran Zvonar, Javier R. Fonollosa, Senior Member
In this paper, two probabilistic adaptive algorithms for jointly detecting active users in a DS-CDMA system are reported. The first one, which is based on the theory of hidden Markov models...
Blind Channel Estimation and Data Detection Using Hidden Markov Models (1997)
Carles Anton-Haro, Javier R. Fonollosa, Javier R. Fonollosa
In this correspondence, we propose applying the hidden Markov models (HMM) theory to the problem of blind channel estimation and data detection. The Baum--Welch (BW) algorithm, which is able to...