<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-7743</journal-id>
<journal-title><![CDATA[Ingeniería, investigación y tecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. invest. y tecnol.]]></abbrev-journal-title>
<issn>1405-7743</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-77432016000200283</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sistema MIMO óptico inalámbrico con modulación BPSK y recepción óptima homodina tolerante a difusión de fase óptica y turbulencia atmosférica]]></article-title>
<article-title xml:lang="en"><![CDATA[MIMO Optical Wireless System with BPSK Modulation and Optimum Homodyne Reception Tolerant to Optical Phase Diffusion and Atmospheric Turbulence]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arvizu-Mondragón]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos-Aguilar]]></surname>
<given-names><![CDATA[Joel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera-Nava]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Huawei Technologies de Mexico Network Technical Services Department ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>17</volume>
<numero>2</numero>
<fpage>283</fpage>
<lpage>295</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-77432016000200283&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-77432016000200283&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-77432016000200283&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En este trabajo se presenta un sistema de comunicaciones MIMO óptico inalámbrico con modulación binaria de la fase óptica, el cual emplea diversidad espacial con recepción óptica homodina, estimación óptima, postdetección de la fase óptica y combinador lineal de máxima verosimilitud. El uso de una configuración de diversidad espacial permite obtener una mayor tolerancia a los efectos que la turbulencia óptica provoca sobre la señal de información, mientras que la estimación de fase óptima compensa la degradación sobre la tasa de bit erróneo ocasionada por el ruido de fase, inherente a las fuentes ópticas comúnmente utilizadas en las telecomunicaciones. Este enfoque, no se ha abordado previamente desde el punto de vista experimental, por ello consideramos que esta es la contribución más importante de este trabajo. Se presenta la implementación y caracterización de nuestro sistema en un montaje experimental simplificado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: This paper presents an optical wireless MIMO communication system with binary modulation of the optical phase, which uses spatial diversity, optical homodyne reception, a post-detection stage for the optimal estimation of the optical phase, and maximum-likelihood linear combining stage, The use of a spatial diversity configuration enables to get a higher tolerance to the effects that the turbulence causes on the optical information signal while the optimal phase estimation stage compensates the degradation over the bit error rate caused by the phase-noise inherent to the optical sources commonly used in telecommunications. This approach, to the best of our knowledge, has not previously been addressed from the experimental point of view; we think that this is the more important contribution of our work. So, we present the implementation and characterization of our system in a simplified experimental set-up.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[MIMO óptico]]></kwd>
<kwd lng="es"><![CDATA[comunicaciones ópticas inalámbricas]]></kwd>
<kwd lng="es"><![CDATA[recepción homodina]]></kwd>
<kwd lng="es"><![CDATA[turbulencia óptica]]></kwd>
<kwd lng="es"><![CDATA[variables de estado]]></kwd>
<kwd lng="en"><![CDATA[optical MIMO]]></kwd>
<kwd lng="en"><![CDATA[optical wireless communications]]></kwd>
<kwd lng="en"><![CDATA[homodyne reception]]></kwd>
<kwd lng="en"><![CDATA[optical turbulence]]></kwd>
<kwd lng="en"><![CDATA[state variables]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Andrew]]></surname>
<given-names><![CDATA[L.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Phillips]]></surname>
<given-names><![CDATA[R.L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Laser beam propagation through random media]]></source>
<year>2005</year>
<publisher-loc><![CDATA[Bellingham, Washington ]]></publisher-loc>
<publisher-name><![CDATA[SPIE Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arvizu-Mondragón]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez-López]]></surname>
<given-names><![CDATA[J.D.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Mendieta-Jiménez]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Coherent optical wireless link employing phase estimation with multiple-beam, multiple-aperture, for increased tolerance to turbulence]]></article-title>
<source><![CDATA[IEICE Transactions on Communications]]></source>
<year>2010</year>
<volume>E93-B</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>226-9</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bell]]></surname>
<given-names><![CDATA[A.G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The production of sound by radiant energy]]></article-title>
<source><![CDATA[Science]]></source>
<year>1881</year>
<volume>2</volume>
<numero>48</numero>
<issue>48</issue>
<page-range>242-53</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Belmonte]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kahn]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Capacity of coherent free-space optical links using diversity-combining techniques]]></article-title>
<source><![CDATA[Optics Express]]></source>
<year>2009</year>
<volume>17</volume>
<numero>15</numero>
<issue>15</issue>
<page-range>12601-11</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Farid]]></surname>
<given-names><![CDATA[A.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Hranilovic]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diversity gain and outage probability for MIMO free-space optical links with misalignment]]></article-title>
<source><![CDATA[IEEE Transactions on Communications]]></source>
<year>2012</year>
<volume>60</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>479-87</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Goyal]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Kumar]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Nath]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<source><![CDATA[Mitigation of atmospheric turbulence in free space optics: a review]]></source>
<year></year>
<conf-name><![CDATA[ FifthInternational Conference on Advanced Computing &amp; Communication Technologies (ACCT)]]></conf-name>
<conf-date>2015</conf-date>
<conf-loc>Haryana, India </conf-loc>
<page-range>634-40</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Grosinger]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Investigation of polarization modulation in optical free space communications through the atmosphere]]></source>
<year>2008</year>
<publisher-loc><![CDATA[Viena, Austria ]]></publisher-loc>
<publisher-name><![CDATA[Instituto de Comunicación y de Ingeniería de Radio-Frecuencia]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kashani]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Safari]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Uysal]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Optimal relay placement and diversity analysis of relay-assisted free-space optical communication systems]]></article-title>
<source><![CDATA[Journal of Optical Communications and Networking]]></source>
<year>2013</year>
<volume>5</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>37-47</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Khalighi]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Uysal]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Survey on free space optical communication: a communication theory perspective]]></article-title>
<source><![CDATA[IEEE Communication Surveys &amp; Tutorials]]></source>
<year>2014</year>
<volume>16</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>2231-58</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hajjarian]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Fadlullah]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[MIMO free space optical communications in turbil and turbulent atmosphere]]></article-title>
<source><![CDATA[Journal of communications]]></source>
<year>2009</year>
<volume>4</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>524-32</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="">
<source><![CDATA[Lighpointe homepage]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Niu]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Schlenker]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Cheng]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Holzman]]></surname>
<given-names><![CDATA[J.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Schober]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Coherent wireless optical communications with predetection and postdetection EGC over gamma-gamma atmospheric turbulence channels]]></article-title>
<source><![CDATA[IEEE/OSA Journal of Optical Communications and Networking]]></source>
<year>2011</year>
<volume>3</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>860-9</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Popoola]]></surname>
<given-names><![CDATA[W.O.]]></given-names>
</name>
<name>
<surname><![CDATA[Ghassemlooy]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Allen]]></surname>
<given-names><![CDATA[J.I.H.]]></given-names>
</name>
<name>
<surname><![CDATA[Leitgeb]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Gao]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Free space optical communication employing modulation and spatial diversity in atmospheric turbulence channel]]></article-title>
<source><![CDATA[IET Optoelectron]]></source>
<year>2008</year>
<volume>2</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>16-23</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Prabu]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Kumar]]></surname>
<given-names><![CDATA[D.S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[MIMO free-space optical communication employing coherent BPOLSK modulation in atmospheric optical turbulence channel with pointing errors]]></article-title>
<source><![CDATA[Optics Communications]]></source>
<year>2015</year>
<volume>343</volume>
<page-range>188-94</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Snyder]]></surname>
<given-names><![CDATA[D.L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The state variable approach to continuous estimation]]></article-title>
<source><![CDATA[Res. Mon.]]></source>
<year>1969</year>
<numero>51</numero>
<issue>51</issue>
<page-range>114</page-range><publisher-loc><![CDATA[Cambridge, Massachusetts ]]></publisher-loc>
<publisher-name><![CDATA[MIT Press]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
