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📁 使用MATLAB 和C MEX编写的在4, 8, 16, 32, 64, 128, 或 256多状态下QBSK调制空时格码仿真源程序。
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123 
      style="COLOR: black; FONT-FAMILY: Verdana"><A 
      href="http://bsnugroho.googlepages.com/sttc4PskUseMex.m"><FONT 
      size=2>sttc4PskUseMex.m<O p></O></FONT></A></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><A 
      href="http://bsnugroho.googlepages.com/stViterbi.mexglx"><FONT 
      size=2>stViterbi.mexglx</FONT></A></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><A 
      href="http://bsnugroho.googlepages.com/bitErrFast.mexglx"><FONT 
      size=2>bitErrFast.mexglx</FONT></A></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; BORDER-LEFT-COLOR: #ece9d8; PADDING-BOTTOM: 0in; WIDTH: 239.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 150.25pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    vAlign=top width=319>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Here all the 
      functions are executed.<O p></O></FONT></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Build the trellis 
      structure.<O p></O></FONT></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Space time code 
      encoder and decoder.<O p></O></FONT></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"></SPAN><FONT 
      size=2></FONT>&nbsp;</P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Space time code 
      viterbi decoder.<O p></O></FONT></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Compares the 
      resulting bits to the original one and find the error rate.<O 
      p></O></FONT></SPAN></P></TD></TR></TBODY></TABLE>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT size=2>&nbsp;<STRONG>Table 
2. </STRONG>Function (Linux/Unix version)</FONT></O></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
size=2></FONT></O></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>MATLAB’s .m file version 
of the encoder-decoder:<O p></O></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
size=2></FONT></O></SPAN></P>
<TABLE class=MsoTableGrid 
style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BACKGROUND: white; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-border-alt: solid windowtext .5pt; mso-yfti-tbllook: 480; mso-padding-alt: 0in 5.4pt 0in 5.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev: .5pt solid windowtext" 
cellSpacing=0 cellPadding=0 border=1>
  <TBODY>
  <TR 
  style="HEIGHT: 123.25pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes; mso-yfti-lastrow: yes">
    <TD 
    style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 239.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 123.25pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt" 
    vAlign=top width=319>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><A 
      href="http://bsnugroho.googlepages.com/qpskSpaceTimeMainNormal.m"><FONT 
      size=2>qpskSpaceTimeMainNormal.m<O p></O></FONT></A></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><A 
      href="http://bsnugroho.googlepages.com/stTrellis.m"><FONT 
      size=2>stTrellis.m<O p></O></FONT></A></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><A 
      href="http://bsnugroho.googlepages.com/sttc4Psk.m"><FONT 
      size=2>sttc4Psk.m<O p></O></FONT></A></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><A 
      href="http://bsnugroho.googlepages.com/bitErrFast.dll"><FONT 
      size=2>bitErrFast.dll<O p></O></FONT></A></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; BORDER-LEFT-COLOR: #ece9d8; PADDING-BOTTOM: 0in; WIDTH: 239.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 123.25pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    vAlign=top width=319>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Here all the 
      functions are executed.<O p></O></FONT></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Build the trellis 
      structure.<O p></O></FONT></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
      size=2></FONT></O></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Space time code 
      encoder and decoder.<O p></O></FONT></SPAN></P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"></SPAN><FONT 
      size=2></FONT>&nbsp;</P>
      <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>Compares the 
      resulting bits to the original one and find the error rate.<O 
      p></O></FONT></SPAN></P></TD></TR></TBODY></TABLE>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center"><FONT 
size=2><SPAN style="COLOR: black; FONT-FAMILY: Verdana"><O p><STRONG>Table 
3.</STRONG>&nbsp;MATLAB m file f</O></SPAN><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p>unction</O></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT size=2><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p></O></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>The C source 
code:</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p></O></SPAN><FONT 
size=2></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT 
size=2></FONT></O></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><A 
href="http://bsnugroho.googlepages.com/stViterbi.c"><FONT size=2>stViterbi.c<O 
p></O></FONT></A></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><A 
href="http://bsnugroho.googlepages.com/bitErrFast.c"><FONT 
size=2>bitErrFast.c</FONT></A></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p><FONT size=2></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT face=georgia 
size=2><STRONG>Running&nbsp;simulation</STRONG></FONT></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2>I did not&nbsp;include 
some fancy user interfaces in order to keep the souce codes as clean as 
possible, hence the main&nbsp;idea&nbsp;can&nbsp;be conveyed&nbsp;with clarity. 
Nevertheless, the codes are written with flexibility, so only minimal alteration 
is needed to run&nbsp;the simulation&nbsp;under various 
conditions.&nbsp;Firstly, you need to decide&nbsp;the number of states by 
changing&nbsp;<SPAN style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
face="courier new,monospace"><STRONG>qpskSpaceTimeMain.m</STRONG></FONT> for 
MEX,&nbsp;or <FONT 
face="courier new,monospace"><STRONG>qpskSpaceTimeMainNormal.m</STRONG></FONT> 
for&nbsp;normal MATLAB script:</SPAN></FONT></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT face="courier new,monospace" 
size=2>[line 5]: nrState = 4;<BR></FONT><BR><FONT size=2><FONT face=verdana>The 
readily available option for</FONT> <FONT 
face="courier new,monospace">nrState</FONT>&nbsp;are 4, 8, 16, 32, 64, 128, and 
256. If you be able to&nbsp;generate&nbsp;your own generator matrix, you might 
want to try <FONT face="Courier New">nrState </FONT>beyond 256 
states.&nbsp;Secondly, you might want to change other parameters, such 
as:</FONT></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
size=2></FONT></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2><FONT 
face="courier new,monospace">[line 8]: <SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2><FONT 
face="courier new,monospace">SNRindB = [8 10 12 14 16];</FONT><FONT 
face=Verdana>, Signal to Noise Ratio (SNR) 
range,</FONT></FONT></SPAN></SPAN></FONT></FONT></SPAN></SPAN></FONT></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
size=2></FONT></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2><FONT 
face="courier new,monospace">[line 11]: N = 10000;</FONT>, number of 
frame,</FONT></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
size=2></FONT></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT size=2><FONT 
face="courier new,monospace">[line 14]: D = 130;</FONT>, number of data per 
frame.</FONT></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
size=2></FONT></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
size=2>Finally,&nbsp;call&nbsp;<SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
face="courier new,monospace"><STRONG>qpskSpaceTimeMain.m</STRONG></FONT>&nbsp;or 
<FONT face="courier new,monospace"><STRONG>qpskSpaceTimeMainNormal.m 
</STRONG></FONT><FONT face=Verdana>from&nbsp;MATLAB's 
shell.&nbsp;</FONT></SPAN>If you&nbsp;want&nbsp;to make&nbsp;multiple&nbsp;plots 
under one figure, do not&nbsp;forget to hold the plot and change the&nbsp;curve 
properties (color, line, and point)&nbsp;as 
well.&nbsp;</FONT></SPAN></SPAN><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT 
size=2></FONT></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt">&nbsp;</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"></O></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><O p></O></SPAN><SPAN 
style="COLOR: black; FONT-FAMILY: Verdana"><FONT face=georgia 
size=2><STRONG>Example of the output</STRONG></FONT></SPAN></P>
<P class=separator style="CLEAR: both; TEXT-ALIGN: center"><A 
style="BORDER-TOP-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; MARGIN-LEFT: 1em; MARGIN-RIGHT: 1em; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; cssFloat: " 
href="http://bsnugroho.googlepages.com/qpskSttc01.png/qpskSttc01-full.jpg"><FONT 
size=2><IMG style="cssFloat: " 
src="http://bsnugroho.googlepages.com/qpskSttc01.png/qpskSttc01-large.jpg" 
Ol="293" closure hashCode GALLERYIMG="no"></FONT></A></P>
<P class=separator style="CLEAR: both; TEXT-ALIGN: center"><FONT 
size=2><STRONG>Figure 1. </STRONG>Frame error rate vs. SNR</FONT></P>
<P class=separator style="CLEAR: both; TEXT-ALIGN: left"><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: Verdana; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'"><FONT 
size=2><STRONG>Figure 1</STRONG> shows that codes with 64, 128 and 256 states 
almost overlap each other. It seems that improvement is negligible when you 
increase the state number over 64, but you must take into account the code 
design, which is how you define the generator matrix. In this simulation I do 
not use the optimum code criterion as described in [1] for 64, 128 and 256 
states.</FONT></SPAN></P>
<P class=separator style="CLEAR: both; TEXT-ALIGN: left"><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: Verdana; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'"><FONT 
face=georgia size=2><STRONG>References</STRONG></FONT></SPAN></P>
<P class=separator style="CLEAR: both; TEXT-ALIGN: left"><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: Verdana; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'"><FONT 
size=2>[1]&nbsp;V. Tarokh, N. Seshari, and&nbsp;A. R. Calderbank, "Space-Time 
Code for High Data Rate Wireless Communication: Performance Criterion and Code 
Construction", <EM>IEEE Trans.&nbsp;On Information Theory</EM>, vol. 44, no. 2, 
pp 744-765, March 1998.&nbsp;</FONT></SPAN></P></O></SPAN></DIV></DIV>
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