Conference Paper
Blind Decoding of MISOOSTBC Systems Based on Principal Component Analysis
Dept. of Commun. Eng., Cantabria Univ., Santander
DOI: 10.1109/ICASSP.2006.1661026 Conference: Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on, Volume: 4 Source: IEEE Xplore

Conference Paper: A DecisionAided Strategy for Enhancing Transmissions in Wireless OSTBCBased Systems.
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ABSTRACT: Orthogonal SpaceTime Block Coding (OSTBC) allows multiple antenna wireless systems to exploit spatial and temporal diversity. When transmitting multimedia content, OSTBCbased system's performance can be greatly enhanced through the optimization of different parameters. For instance, data rates can be improved if the overhead related to sending side information (pilot symbols) is minimized. Also, processing speed can be increased if the decoding algorithms computational load is reduced. In this paper, it is presented a decisionaided channel estimation method aimed specifically at addressing the aforementioned two issues: the method incorporates unsupervised strategies to estimate the channel without using pilot symbols and a simple decision rule to determine if channel estimation is required for each frame, what allows transceiver designers to implement techniques to avoid channel estimation.Advances in Computational Intelligence  11th International WorkConference on Artificial Neural Networks, IWANN 2011, TorremolinosMálaga, Spain, June 810, 2011, Proceedings, Part II; 01/2011 
Conference Paper: A Novel Strategy for Improving the Quality of Embedded Zerotree Wavelet Images Transmitted over Alamouti Coding Systems.
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ABSTRACT: This work deals with the transmission of images, previously coded using the Embedded Zerotree Wavelet (EZW) transform, over wireless systems in which SpaceTime Coding (STC) is used. It is shown how the system performance, measured in terms of Peak Signal to Noise Ratio (PSNR), can be improved using bit allocation strategies that take into account the special structure of the EZW bitstream, where the bits firstly allocated are associated to the lowest frequency subbands, and therefore, an error–free transmission of such bits will be crucial to appropriately recover the transmitted image.Advances in Computational Intelligence  11th International WorkConference on Artificial Neural Networks, IWANN 2011, TorremolinosMálaga, Spain, June 810, 2011, Proceedings, Part I; 01/2011  [Show abstract] [Hide abstract]
ABSTRACT: In wireless communication systems, channel state information (CSI) acquisition is typically performed at the receiver side every time a new frame is received, without taking into account whether it is really necessary or not. Considering the special case of the 2 × 1 Alamouti orthogonal spacetime block code, this work proposes to reduce computational complexity associated with the CSI acquisition by including a decision rule to automatically determine the time instants when CSI must be again updated. Otherwise, a previous channel estimate is reused. The decision criterion has a very low computational complexity since it consists in computing the crosscorrelation between preambles sent by the two transmit antennas. This allows us to obtain a considerable reduction on the complexity demanded by both supervised and unsupervised (blind) channel estimation algorithms. Such preambles do not penalize the spectral efficiency in the sense they are mandatory for frame detection as well as for time and frequency synchronization in current wireless communication systems.Neural Computing and Applications 11/2013; · 1.76 Impact Factor
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