qpsk decoder.htm

来自「对ASK调制解调进行了仿真,包括程序仿真和模型仿真」· HTM 代码 · 共 33 行

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML><HEAD><TITLE>QPSK Decoder</TITLE>
<META http-equiv=Content-Type content="text/html; charset=windows-1252">
<META content="MSHTML 6.00.2900.2873" name=GENERATOR>
<META content=FrontPage.Editor.Document name=ProgId></HEAD>
<BODY>
<H1>
<CENTER><STRONG><FONT size=5>QPSK Decoder</FONT></STRONG></CENTER></H1>
<BLOCKQUOTE>
  <BLOCKQUOTE><B><FONT size=5>
    <P>General description</P></FONT></B>
    <P align=justify>The QPSK decoder supports soft bit Viterbi decoding. The 
    decoder uses the most modern digital PLL synchronization technology for bit 
    synchronization and a neural network for detection. It prints QPSK varicode 
    characters on the screen. It searches the QPSK transmission within the given 
    frequency boundaries. Also you can set the decoded frequency by double 
    clicking the mouse on the required frequency position.</P>
    <P align=justify>&nbsp;</P>
    <P align=justify>When QPSK transmission has been detected at some frequency 
    within the given range, the decoder will then lock itself to that frequency. 
    When locked, the decoder draws a bold blue line on the spectrum display, at 
    the currently locked frequency. If the decoder is not locked, then the blue 
    line is not shown as bold. After locking the frequency, the decoder starts 
    to estimate the keying parameters of the transmission. When all the 
    parameters have been estimated, then the decoder starts to print characters 
    on the screen.</P>
    <P align=justify>&nbsp;</P>
    <P align=justify>In the locked state, the carrier frequency is automatically 
    monitored within the given frequency boundaries. If the carrier frequency 
    changes, then the decoder moves to the new frequency. If 'Lock' is pressed 
    in the user interface, then the decoder will not automatically change its 
    frequency. When 慤nLock

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