This is a good first try. Here are a few hints to help you out.
1 - Use $_, @_, and %_ as much as possible, also don't use long or descriptive variable names.
2 - Try to use math expressions instead of plain numbers.
3 - Use trinary instead of if if possible.
4 - Try using some evals, this lets you hide your code.

Below is an example of how you could have worked this to make it more obfuscated.

# You may want to change the name of $a
$a = "a";

# Don't use a simple number, make a math statement instead
# Remember that $a++ will increment after the expression is
# evaluated. I used %_ as the hash to add some confusion
for (1 .. (6/3*10+15/2.5)){$_{$_} = $a++;}

# You may want to write a piece of code that generates
# this string to hide things a bit more
$c = '01010.10101.10011.10100..00001.01110.01111
.10100.01000.00101.10010..10000.00101.10010.01100.
.01000.00001.00011.01011.00101.10010';

# Using @_ to add some more confusion
@_= split( /\.\n*/, $c );

# Reuse $a and put your sub in it. Note the use of >>
# instead of multiple if statements
$a = sub {$c = 0; for (0..$#_){$c+=(16>>$_) if $_[$_];}$c;};

foreach ( 0 .. $#_ ) { 

# Replace your if statement with trinary, dereferance $a to call your 
+sub
    $japh.=($_[$_] ne "")?$_{&$a(split(/\s*/,$_[$_]))}:" ";
}

$japh =~ s/\b([a-z])/\U\1/g;
print $japh,"\n";

# Here is it squished together.
$a="a";for(1..(6/3*10+15/2.5)){$_{$_}=$a++;}
$c='01010.10101.10011.10100..00001.01110.01111
.10100.01000.00101.10010..10000.00101.10010.01100.
.01000.00001.00011.01011.00101.10010';
@_=split(/\.\n*/,$c);$a=sub{$c = 0;
for(0..$#_){$c+=(16>>$_)if$_[$_];}$c;};
foreach(0..$#_){$japh.=($_[$_]ne"")?
$_{&$a(split(/\s*/,$_[$_]))}:" ";}
$japh =~ s/\b([a-z])/\U\1/g;
print $japh,"\n";
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I hope this helps you.