Browsing by Author "Lamarca Orozco, M. Meritxell"
Now showing items 1-20 of 44
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A non-linear channel code for covert communications
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Conference lecture
Restricted access - publisher's policyThis paper presents an explicit channel code design for covert communications in the Binary Symmetric Channel. The proposed architecture is composed of the serial concatenation of a linear code and a graph-based non-linear ... -
A rain and scintillation Ka-band channel simulator
(ESA, 2008)
Conference report
Open AccessThis paper describes the implementation of a Ka-band satellite channel simulator with emphasis on the synthesis of scintillation processes. The problem becomes one of generating a given probability density function, ... -
Adaptive sampling for fast sparsity pattern recovery
(2011)
Conference report
Open AccessIn this paper we propose a low complexity adaptive algorithm for lossless compressive sampling and reconstruction of sparse signals. Consider a sparse non-negative real signal x containing only k << n non-zero values. ... -
ADC Quantization Requirements
(2000-06)
Research report
Open AccessIn this document, we analyze the impact of the quantization at the input of the demultiplexer. The required number of bits of the Analog-to-Digital-Converter (ADC) is obtained, along with the corresponding quantization losses. -
An IR-HARQ scheme for covert communications
(Institute of Electrical and Electronics Engineers (IEEE), 2021)
Conference report
Open AccessThis paper explores the advantages of incremental redundancy hybrid-ARQ schemes for covert communications in which a feedback channel is available. The use of efficient incremental redundancy with sub-codewords of different ... -
Analog joint source channel coding using space-filling curves and MMSE decoding
(2009)
Conference report
Open AccessWe investigate the performance of a discrete-time all-analog-processing joint sourcechannel coding system for the transmission of i.i.d. Gaussian and Laplacian sources over AWGN channels. In the encoder, two samples of ... -
Analysis of LDPC code syndrome entropy based on subgraphs
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Open AccessWe propose a method to bound the syndrome entropy of linear block codes from their factor graph representation. It is specially suited for sparse graphs such as those of low density parity check codes. It is based on the ... -
ANTARES Project (Phase B). Multiple acces scheme definition. Diverse trade-offs analysis for TDMA and CDMA
(2010-03-01)
Research report
Restricted access - confidentiality agreement -
ANTARES Project (Phase B). Multiple acces scheme definition. Spectral efficiency analysis of the MAC techniques considered for the Antares forward and return links
(2010-07-01)
Research report
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ANTARES Project (Phase B). Multiple acces scheme definition. Successive interference cancellation for A-CDMA
(2010-05-01)
Research report
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ANTARES Project (Phase B). Multiple access scheme definition. Impact of the aeronautical channel on the MAC techniques considered for the Antares forward and return links
(2010-03-01)
Research report
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ANTARES Project (Phase B). Physical layer definition. Equalization detailed design
(2010-08-01)
Research report
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ANTARES Project (Phase B). Physical layer definition. Payload carrier synchronization for the Antares TDMA return link
(2010-08-01)
Research report
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Asymptotic MAP upper bounds for LDPC codes
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Open AccessThis paper aims at computing tight upper bounds for the maximum a posteriori threshold of low-density parity check codes in the asymptotic blocklength regime for the transmission over binary-input memoryless symmetricoutput ... -
Binary graphs and message passing strategies for compressed sensing in the noiseless setting
(Institute of Electrical and Electronics Engineers (IEEE), 2012)
Conference report
Restricted access - publisher's policyWe propose a scheme for Compressed Sensing in the noiseless setting that reconstructs the original signal operating on a binary graph where the samples are obtained sequentially. The proposed scheme has an affordable ... -
Blind equalization based on spatial and temporal diversity in block coded modulations
(Institute of Electrical and Electronics Engineers (IEEE), 1998)
Conference report
Open AccessLinear block codes can be applied in spatial and/or temporal diversity receivers in order to develop high performance schemes for blind equalization in mobile communications. The proposed technique uses the structure of ... -
Channel estimation for transform modulations in mobile communications
(1996)
Conference report
Open AccessThis paper deals with data-aided channel estimation in systems using OFDM modulation. We formulate a pilot symbol-based channel estimator and compare it with the pilot-tone one proposed in [1]. Although this paper focuses ... -
D1. Estudio de códigos PN para mejorar el ensanchado y la eficiencia espectral del sistema CDMA síncrono y asíncrono
(2008-11-10)
Research report
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D2. Estructuras de detector multiusuario para CDMA síncrono y asíncrono
(2008-11-10)
Research report
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D3. Sincronización robusta de frecuencia y fase para M-PSK sobre CDMA
(2008-11-10)
Research report
Restricted access - confidentiality agreement
