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Several more minor edits.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6445 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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@ -15,6 +15,7 @@
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\makeatother
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\makeatother
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\usepackage{nomencl}
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\usepackage{nomencl}
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\usepackage{overcite}
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\renewcommand{\nomname}{Sidebar: Glossary of Specialized Terms}
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\renewcommand{\nomname}{Sidebar: Glossary of Specialized Terms}
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\end_preamble
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\end_preamble
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@ -383,9 +384,9 @@ WSJT-X
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Section 7 summarizes some on-the-air experiences with the new decoder.
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Section 7 summarizes some on-the-air experiences with the new decoder.
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Refer to the sidebar
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Refer to the sidebar
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\series bold
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\series bold
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Glossary
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Glossary of Specialized Terms
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\series default
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\series default
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for brief definitions of some specialized terms.
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for brief definitions of some potentially unfamiliar language.
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\end_layout
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\end_layout
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\begin_layout Section
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\begin_layout Section
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@ -399,7 +400,7 @@ JT65 Messages and Reed Solomon Codes
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\end_layout
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\end_layout
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\begin_layout Standard
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\begin_layout Standard
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JT65 message frames consist of a short compressed 72-bit message encoded
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The JT65 message frame consists of a short, compressed 72-bit message encoded
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for transmission with a Reed-Solomon code.
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for transmission with a Reed-Solomon code.
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Reed-Solomon codes are
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Reed-Solomon codes are
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\emph on
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\emph on
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@ -434,7 +435,7 @@ description "For the JT65 code, a vector of 63 symbol values each in the range 0
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\end_inset
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\end_inset
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, the number of message symbols conveyed by the codeword; and the transmission
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, the number of message symbols conveyed by the codeword; and the transmission
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alphabet, or number of possible values for each symbol in the codewords.
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alphabet, or number of possible values for each symbol in a codeword.
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The codeword length and the number of message symbols are specified with
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The codeword length and the number of message symbols are specified with
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the notation
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the notation
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\begin_inset Formula $(n,k)$
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\begin_inset Formula $(n,k)$
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@ -456,7 +457,7 @@ description "Compression of a message to use a minimum number or bits. JT65 sou
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\end_inset
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\end_inset
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messages conveyed by a 63-symbol JT65 frame thus consist of 72 information
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message conveyed by a 63-symbol JT65 frame thus consists of 72 information
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bits.
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bits.
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The JT65 code is
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The JT65 code is
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\emph on
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\emph on
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@ -666,7 +667,7 @@ The FT algorithm uses the estimated quality of received symbols to generate
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of received words with more than 25 errors.
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of received words with more than 25 errors.
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Algorithms of this type are generally called
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Algorithms of this type are generally called
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\emph on
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\emph on
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reliability based
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reliability-based
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\emph default
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\emph default
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or
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or
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\emph on
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\emph on
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@ -1192,7 +1193,7 @@ We use 3-bit quantization of the metrics
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\begin_inset Formula $p_{2}/p_{1}$
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\begin_inset Formula $p_{2}/p_{1}$
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\end_inset
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\end_inset
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to index the entries in an
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to index the entries in an
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\begin_inset Formula $8\times8$
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\begin_inset Formula $8\times8$
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\end_inset
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\end_inset
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@ -2010,7 +2011,7 @@ Comparisons of decoding performance are usually presented in the professional
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, the signal-to-noise ratio in a 2500 Hz reference bandwidth.
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, the signal-to-noise ratio in a 2500 Hz reference bandwidth.
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The relationship between
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The relationship between
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\begin_inset Formula $E_{b}/N_{o}$
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\begin_inset Formula $E_{b}/N_{0}$
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\end_inset
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\end_inset
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and
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and
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@ -2060,7 +2061,7 @@ Simulated results on the AWGN channel
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\begin_layout Standard
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\begin_layout Standard
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Results of simulations using the BM, KV, and FT decoding algorithms on the
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Results of simulations using the BM, KV, and FT decoding algorithms on the
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JT65 code are presented in terms of word error rate versus
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JT65 code are presented in terms of word error rate versus
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\begin_inset Formula $E_{b}/N_{o}$
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\begin_inset Formula $E_{b}/N_{0}$
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\end_inset
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\end_inset
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in Figure
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in Figure
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@ -2110,7 +2111,7 @@ As expected, on the AWGN channel the soft-decision algorithms FT and KV
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\begin_inset Formula $T=10^{5}$
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\begin_inset Formula $T=10^{5}$
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\end_inset
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\end_inset
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execution time for FT is longer than that for the KV algorithm, but still
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execution time for FT is longer than that for the KV algorithm, but still
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small enough to be fully practical on today's home computers.
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small enough to be fully practical on today's home computers.
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\end_layout
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\end_layout
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@ -2178,7 +2179,7 @@ WSJT
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\begin_layout Standard
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\begin_layout Standard
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Error-free transmission is important in commercial applications, so plots
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Error-free transmission is important in commercial applications, so plots
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like that in Figure
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like Figure
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\begin_inset CommandInset ref
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\begin_inset CommandInset ref
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LatexCommand ref
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LatexCommand ref
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reference "fig:bodide"
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reference "fig:bodide"
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@ -2204,7 +2205,7 @@ reference "fig:WER2"
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\end_inset
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\end_inset
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replots the FT and KV results from Figure
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shows the FT and KV results from Figure
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\begin_inset CommandInset ref
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\begin_inset CommandInset ref
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LatexCommand ref
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LatexCommand ref
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reference "fig:bodide"
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reference "fig:bodide"
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@ -2658,8 +2659,8 @@ reference "fig:spectrogram"
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band.
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band.
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At this time the band was crowded with overlapping signals.
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At this time the band was crowded with overlapping signals.
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With care you can count at least 19 distinct synchronizing tones (the speckled
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With care you can count at least 19 distinct synchronizing tones (the speckled
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vertical lines in the figure), and can see that in some places as many
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vertical lines in the figure), and can see as many as four signals overlapping
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as four signals overlap.
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in some places.
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After signal processing to demodulate the signals and produce soft-symbol
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After signal processing to demodulate the signals and produce soft-symbol
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data for the FT decoder, program
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data for the FT decoder, program
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\emph on
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\emph on
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@ -2674,8 +2675,8 @@ WSJT-X
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The strongest signals (12 in this example) are sequentially decoded and
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The strongest signals (12 in this example) are sequentially decoded and
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subtracted from the raw data after the first pass.
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subtracted from the raw data after the first pass.
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Another 9 signals are decoded in the second pass.
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Another 9 signals are decoded in the second pass.
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For comparison, the hard-decision BM decoder decodes a total of 12 messages
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For comparison, the hard-decision BM decoder decodes only 12 messages from
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from this recording (9 in the first pass and 3 more in a second).
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this recording (9 in the first pass and 3 more in a second).
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\end_layout
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\end_layout
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\begin_layout Standard
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\begin_layout Standard
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@ -2687,8 +2688,8 @@ status open
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\begin_layout Plain Layout
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\begin_layout Plain Layout
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\align center
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\align center
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\begin_inset Graphics
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\begin_inset Graphics
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filename fig_waterfall.tiff
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filename fig_waterfall.png
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width 6.5in
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scale 60
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BoundingBox 0bp 0bp 1124bp 200bp
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BoundingBox 0bp 0bp 1124bp 200bp
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clip
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clip
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@ -2750,7 +2751,11 @@ key "karn"
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\end_inset
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\end_inset
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, modified slightly so that the Reed-Solomon syndromes are computed only
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, modified slightly so that the Reed-Solomon syndromes are computed only
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once in our most time-consuming loop (steps 2 through 8, Algorithm 1).
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once in our most time-consuming loop (steps 2 through 8,
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\series bold
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Algorithm 1
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\series default
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).
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The FT algorithm has become an integral part of programs
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The FT algorithm has become an integral part of programs
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\emph on
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\emph on
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WSJT,
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WSJT,
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@ -2838,8 +2843,8 @@ key "kv2001"
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IEEE Transactions on Information Theory
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IEEE Transactions on Information Theory
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\emph default
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\emph default
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, Vol.
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, Vol.
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49, Nov.
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49, pp.
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2003.
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2809-2825, 2003.
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\end_layout
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\end_layout
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\begin_layout Bibliography
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\begin_layout Bibliography
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@ -2889,7 +2894,8 @@ IEEE Communications Letters
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\emph default
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\emph default
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, Vol.
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, Vol.
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14, No.
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14, No.
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9, September 2010.
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9, pp.
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863-865, 2010.
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\end_layout
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\end_layout
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\begin_layout Bibliography
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\begin_layout Bibliography
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@ -2914,7 +2920,11 @@ GLOBECOM
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\begin_inset Quotes erd
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\begin_inset Quotes erd
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\end_inset
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\end_inset
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2008 proceedings.
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Proceedings,
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\emph default
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2008
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\emph on
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.
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\end_layout
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\end_layout
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\begin_layout Bibliography
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\begin_layout Bibliography
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@ -2935,8 +2945,8 @@ key "ls2009"
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IEEE Signal Processing Letters,
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IEEE Signal Processing Letters,
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\emph default
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\emph default
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Vol.
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Vol.
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16, No.
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16, pp.
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8, August 2009.
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691-694, 2009.
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\end_layout
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\end_layout
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\begin_layout Bibliography
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\begin_layout Bibliography
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