Systematic Approach to Noncoherent DPSK

<body background="_themes/varhome/hadamard.gif" bgcolor="#FFFFFF" text="#000000" link="#3366CC" vlink="#666666" alink="#FF3300"><font face="trebuchet ms, arial, helvetica">  <p> <a href="http://dsp.colorado.edu"><img src="images/dsplogo.gif" alt="dsplogo.gif (3930 bytes)" border="0" align="middle" WIDTH="153" HEIGHT="50"></a> <a href="http://ece-www.colorado.edu"><img src="_borders/ecebutton.gif" alt="ECE Homepage" align="middle" border="0" WIDTH="63" HEIGHT="56"></a> <a href="http://www.colorado.edu"><img src="_borders/colorado.jpg" alt="University Homepage" align="middle" border="0" WIDTH="91" HEIGHT="54"></a></p> <div align="left"> </font><table border="0" cellpadding="5" cellspacing="0"> <tr> <td width="150" valign="top" align="center"><font face="trebuchet ms, arial, helvetica"><strong><small><small>This paper falls into the Research Interests:</small></small></strong><p><a href="res-ncmu.htm" target="main"><strong><small><small>Noncoherent Multiuser Detection</small></small></strong></a></p> <p><strong><a href="res-divcom.htm" target="_top"><small><small>Wireless Diversity Communications</small></small></a><br> </strong><img src="images/blank.gif" width="150" height="20" alt></font></td> <td valign="top" align="left" width="750"><font face="trebuchet ms, arial, helvetica"><h2><font color="#CC6666">A Systematic Approach to Noncoherent Detection of DPSK Modulation in Single-User Correlated Diversity Rayleigh Fading Channels with Applications to Post-Combining Decorrelative Multiuser Detection</font></h2> <p>M. K. Varanasi, Proc of the 1997 Conf. Inform. Sciences and Systems, pp. 480-485, Johns Hopkins University, March 1997</p> <p>A correlated diversity Rayleigh fading channel is defined as one that admits<br> inter-diversity branch correlation in both the multiplicative fading as well as the additive noise processes and models a variety of diversity communication systems operating over Rayleigh fading channels. In this paper we are interested in applications where receiver simplicity is paramount. The modulation method of choice for such applications is differential phase shift keying so that noncoherent detection is possible at the receiver without having to implement complex channel estimation algorithms. Previous work in noncoherent detection for DPSK modulation is confined to ad-hoc strategies of the equal-gain combining type.</p> <p><>We introduce a systematic approach for dealing with noncoherent detection for DPSK modulation in correlated diversity Rayleigh fading channels. For slowly fading channels where the fading parameters in the diversity branches can be regarded as being essentially identical over two successive symbol intervals, the generalized likelihood ratio test (GLRT) is shown to yield an excellent solution. It has the advantage of not needing the knowledge of the statistics of the fading processes. A minimum error probability (MEP) detector is also derived that is applicable to slow as well as fast fading channels. This MEP detector requires a limited knowledge of the statistics of the fading processes. Exact bit error rates are obtained for the GLRT and the MEP detectors. A comparative analysis with a recently proposed ad-hoc decorrelating equal gain combiner shows significant performance advantages for the GLRT and MEP detectors. Applications to post-combining decorrelative multiuser detection are also considered. </p> <p><a href="pvarciss9703a.pdf" target="_top">Download in .pdf format (278k)</a><br> <a href="pvarciss9703a.zip" target="_top">Download as Postscript .zip (336k)</a></font></td> </tr> </table><font face="trebuchet ms, arial, helvetica"> </div> <p><small><small>Last modified: 2000-03-31T23:10</small></small></p>  </font></body>