📄 sova.htm
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'>
</span>% store possible binary outputs and inputs:<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=SpellE>enc.inp</span> = <span class=GramE>de2bi(</span> oct2dec(
[0:enc.ksym-1] ), <span class=SpellE>enc.k</span>, 'left-<span class=SpellE>msb</span>'
);<span style='mso-spacerun:yes'>
</span>% all possible binary inputs<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=SpellE>enc.out</span> = <span class=GramE>de2bi(</span> oct2dec(
[0:enc.nsym-1] ), <span class=SpellE>enc.n</span>, 'left-<span class=SpellE>msb</span>'
);<span style='mso-spacerun:yes'>
</span>% all possible binary outputs<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=SpellE>enc.bininp</span> = 2*enc.inp-1;<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
class=GramE><span lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:
宋体;mso-font-kerning:0pt'>return</span></span><span lang=EN-US style='font-size:
12.0pt;font-family:宋体;mso-bidi-font-family:宋体;mso-font-kerning:0pt'>;<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
class=GramE><span lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:
宋体;mso-font-kerning:0pt'>function</span></span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;mso-font-kerning:
0pt'> out = sovadec_1N( <span class=SpellE>msg</span>, <span class=SpellE>llr</span>,
<span class=SpellE>trl</span>, win ),<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'>% SOVADEC optimized for 1/N encoders (faster!)<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'>
</span>% error checking:<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'>
</span>if( ~<span class=SpellE>istrellis</span>( <span class=SpellE>trl</span>
) ), error( 'Incorrect input trellis!' ); end;<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=GramE>if(</span> <span class=SpellE>nargin</span> <= 2 ), error(
'Incorrect number of input <span class=SpellE>args</span>!' ); end;<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=GramE>if(</span> <span class=SpellE>nargin</span> == 3 ), win = length( <span
class=SpellE>llr</span> )+1; end;<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'>
</span>% some parameters:<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'>
</span>INF = 9e9;<span
style='mso-spacerun:yes'>
</span>% infinity<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=GramE>enc</span> = trellis2enc( <span class=SpellE>trl</span> );<span
style='mso-spacerun:yes'>
</span>% encoder parameters<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>len</span></span> = length( <span class=SpellE>llr</span>
) / <span class=SpellE>enc.k</span>;<span
style='mso-spacerun:yes'>
</span>% number of decoding steps (total) <span
style='mso-spacerun:yes'> </span><o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=GramE>win</span> = min( [ win, <span class=SpellE>len</span> ] );<span
style='mso-spacerun:yes'>
</span>% trim the buffer if <span class=SpellE>msg</span> is short<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=GramE>old</span> = <st1:place w:st="on"><span class=SpellE>NaN</span></st1:place>;<span
style='mso-spacerun:yes'>
</span>% to remember the last survivor<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'>
</span>% <span class=GramE>allocate</span> memory for the trellis:<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>metr</span></span> = zeros( <span class=SpellE>enc.stat</span>,
win+1 ) -INF;<span
style='mso-spacerun:yes'>
</span>% path metric buffer<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>metr</span></span><span class=GramE>(</span> 1,1
) = 0;<span
style='mso-spacerun:yes'>
</span>% initial state => (0,0)<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>surv</span></span> = zeros( <span class=SpellE>enc.stat</span>,
win+1 );<span
style='mso-spacerun:yes'>
</span>% survivor state buffer<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan;
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lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:宋体;
mso-font-kerning:0pt'><span style='mso-spacerun:yes'> </span><span
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