M.A. Bacallado

Universidad de Las Palmas de Gran Canaria, Las Palmas, Canary Islands, Spain

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Publications (5)2.76 Total impact

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    ABSTRACT: This paper introduces new techniques for improving the security level of the wireless optical systems. In this way, we are going to use modulation schemes based on spread spectrum theory. These techniques had been developed for military applications in order to obtain reliable and secure communications, so they seem to be a good candidate for our systems. Spread spectrum systems perform a data encryption in the modulation process, and they are able to work in presence of high level interference and intentional jamming signals. On the other hand, these schemes can be also applied to optical barriers and perimeter control systems, because the spread spectrum signal improves the robustness and invulnerability of the security barriers
    Security Technology, 2005. CCST '05. 39th Annual 2005 International Carnahan Conference on; 11/2005
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    ABSTRACT: In this paper, the design and experimental testing of a direct-sequence spread spectrum (DSSS) system for wireless infrared LAN is presented. This method improves the wireless IR communications performances against multipath propagation and narrowband interference. We have implemented a IR-DSSS prototype with 100 MHz code frequency and 6 Mbps bit rate. We have also studied the effects of both Gaussian and sinusoidal signal conformation over wireless optical DSSS systems. These results show that these techniques reduce the adjacent-channel interference without loss of process gain or substantial reductions of BER vs. S/N performances. We also present some results about a simplified synchronization structure to be used on reduced-cost domestic equipment. These systems are suitable for different applications at low and medium rates, especially for in-house.
    IEEE Transactions on Consumer Electronics 06/2004; · 1.09 Impact Factor
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    ABSTRACT: In this paper, the design and experimental testing of a direct-sequence spread spectrum (DSSS) system for wireless indoor infrared network is presented. This method improves the wireless IR communications performances against multipath propagation and narrowband interference. We have implemented an IR-DSSS prototype with 100 MHz code frequency and about 6 Mbps bit rate. We also present some results on a simplified synchronization structure so as to be used on reduced-cost domestic equipment. These systems are suitable for different applications at low and medium rates, especially for in-house communications between domestic appliances.
    Control, Communications and Signal Processing, 2004. First International Symposium on; 02/2004
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    ABSTRACT: In this Letter the effect of using pulse conformation techniques over a DSSS wireless optical system is explored. The performances of both Gaussian and sinusoidal conformation over the spread and code signal are compared. As a pattern of comparison, the side-lobe elimination for adjacent-channel interference reduction, the process gain, and the BER versus signal to narrow-band interference ratio have been considered. Simulation results and prototype testing are given so as to illustrate the results obtained with this technique. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 360–364, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10462
    Microwave and Optical Technology Letters 07/2002; 34(5):360 - 364. · 0.59 Impact Factor
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    ABSTRACT: The design and experimental characterization of a wireless infrared fast frequency hopping spread spectrum (WIR-FFH-SS) system is presented. The use of spread spectrum techniques on wireless infrared indoor communications reduces the effect of interference present in the infrared channel. It also improves the system performance versus multipath propagation. The use of FH-SS techniques allow the use of code division multiple access (CDMA) strategies for sharing the channel. We have developed and tested a prototype with a bit rate of 1 Mb/s, but it can be easily raised to 4 Mb/s. We also present some results on a simplified synchronization structure for use with reduced-cost domestic equipment. These systems are suitable for different applications at low and medium rates
    IEEE Transactions on Consumer Electronics 03/2002; · 1.09 Impact Factor