SVN r8748
This commit is contained in:
Jordan Sherer
@@ -1,33 +0,0 @@
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make-pchk ex-ham7a.pchk 3 7 0:0 0:3 0:4 0:5 1:1 1:3 1:4 1:6 2:2 2:4 2:5 2:6
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make-gen ex-ham7a.pchk ex-ham7a.gen dense
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Number of 1s per check in Inv(A) X B is 3.0
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transmit 7x100000 ex-ham7a.rec 1 awgn 0.5
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Transmitted 700000 bits
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# DECODE BY ENUMERATION TO MINIMIZE BLOCK ERROR PROBABILITY
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decode ex-ham7a.pchk ex-ham7a.rec ex-ham7a.dec-blk awgn 0.5 \
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enum-block ex-ham7a.gen
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Decoded 100000 blocks, 100000 valid. Average 16.0 iterations, 2% bit changes
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verify ex-ham7a.pchk ex-ham7a.dec-blk ex-ham7a.gen
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Block counts: tot 100000, with chk errs 0, with src errs 186, both 0
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Bit error rate (on message bits only): 7.950e-04
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# DECODE BY ENUMERATION TO MINIMIZE BIT ERROR PROBABILITY
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decode ex-ham7a.pchk ex-ham7a.rec ex-ham7a.dec-bit awgn 0.5 \
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enum-bit ex-ham7a.gen
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Decoded 100000 blocks, 99988 valid. Average 16.0 iterations, 2% bit changes
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verify ex-ham7a.pchk ex-ham7a.dec-bit ex-ham7a.gen
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Block counts: tot 100000, with chk errs 12, with src errs 186, both 7
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Bit error rate (on message bits only): 7.775e-04
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# DECODE BY PROBABILITY PROPAGATION
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decode ex-ham7a.pchk ex-ham7a.rec ex-ham7a.dec-prp awgn 0.5 \
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prprp 200
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Decoded 100000 blocks, 99927 valid. Average 0.3 iterations, 2% bit changes
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verify ex-ham7a.pchk ex-ham7a.dec-prp ex-ham7a.gen
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Block counts: tot 100000, with chk errs 73, with src errs 276, both 52
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Bit error rate (on message bits only): 1.290e-03
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@@ -0,0 +1,155 @@
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=== AP Decoding
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The _WSJT-X_ decoders for JT65, QRA64, and FT8 include optional
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procedures that use naturally accumulating information during a
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minimal QSO. This _a priori_ (AP) information increases sensitivity
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of the decoder by up to 4 dB, at the cost of a slightly higher rate of
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false decodes.
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For example: when you decide to answer a CQ, you already know your own
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callsign and that of your potential QSO partner. The software
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therefore "`knows`" what to expect for 57 of the 72 message bits (28
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bits for each of two callsigns, 1 bit for message type) in the next
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received message. The decoder's task can thus be reduced to
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determining the remaining 15 bits of the message and ensuring that the
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resulting solution is reliable.
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AP decoding starts by setting AP bits to the hypothesized values, as
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if they had been received correctly. We then determine whether the
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remaining message and parity bits are consistent with the hypothesized
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AP bits, with a specified level of confidence. Successful AP decodes
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are labeled with an end-of-line indicator of the form `aP`, where `P`
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is one of the single-digit AP decoding types listed in Table 1. For
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example, `a2` indicates that the successful decode used MyCall as
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hypothetically known information.
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[[FT8_AP_INFO_TABLE]]
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.FT8 AP information types
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[width="35%",cols="h10,<m20",frame=topbot,options="header"]
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|===============================================
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|aP | Message components
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|a1 | CQ     ?     ?
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|a2 | MyCall     ?     ?
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|a3 | MyCall DxCall     ?
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|a4 | MyCall DxCall RRR
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|a5 | MyCall DxCall 73
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|a6 | MyCall DxCall RR73
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|===============================================
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If a codeword is found that is judged to have high (but not
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overwhelmingly high) probability of being correct, a `?` character is
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appended when the decoded message is displayed. To avoid misleading
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spots of occasional false decodes, messages so marked are not
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forwarded to {pskreporter}.
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Table 2 lists the six possible QSO states that are tracked by the
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_WSJT-X_ auto-sequencer, along with the type of AP decoding that would
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be attempted in each state.
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[[FT8_AP_DECODING_TYPES_TABLE]]
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.FT8 AP decoding types for each QSO state
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[width="35%",cols="h10,<m20",frame=topbot,options="header"]
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|===========================================
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|State |AP type
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|CALLING STN | 2, 3
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|REPORT | 2, 3
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|ROGER_REPORT | 3, 4, 5, 6
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|ROGERS | 3, 4, 5, 6
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|SIGNOFF | 3, 1, 2
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|CALLING CQ | 1, 2
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|===========================================
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Decoding with _a priori_ information behaves slightly differently
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in JT65. Some details are provided in Tables 3 and 4.
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[[JT65_AP_INFO_TABLE]]
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.JT65 AP information types
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[width="35%",cols="h10,<m20",frame=topbot,options="header"]
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|===============================================
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|aP | Message components
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|a1 | CQ     ?     ?
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|a2 | MyCall     ?     ?
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|a3 | MyCall DxCall     ?
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|a4 | MyCall DxCall RRR
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|a5 | MyCall DxCall 73
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|a6 | MyCall DxCall DxGrid
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|a7 | CQ DxCall DxGrid
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|===============================================
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[[JT65_AP_DECODING_TYPES_TABLE]]
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.JT65 AP decoding types for each QSO state
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[width="35%",cols="h10,<m20",frame=topbot,options="header"]
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|===========================================
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|State |AP type
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|CALLING STN | 2, 3, 6, 7
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|REPORT | 2, 3
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|ROGER_REPORT | 3, 4, 5
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|ROGERS | 3, 4, 5
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|SIGNOFF | 2, 3, 4, 5
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|CALLING CQ | 1, 2, 6
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|===========================================
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=== Decoded Lines
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Displayed information accompanying decoded messages generally includes UTC,
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signal-to-noise ratio in dB, time offset DT in seconds, and
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audio frequency in Hz. Some modes include additional information such
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as frequency offset from nominal (DF), frequency drift (Drift or F1),
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or distance (km or mi).
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There may also be some cryptic characters with special meanings
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summarized in the following Table:
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[[DECODED_LINES_TABLE]]
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.Notations used on decoded text lines
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[width="50%",cols="h,3*^",frame=topbot,options="header"]
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|===========================================
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|Mode |Mode character|Sync character|End of line information
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|FT8 | ~ | | ?   aP
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|JT4 | $ | *, # | f, fN, dNC
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|JT9 | @ | |
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|JT65 | # | |
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|JT65 VHF| # | *, # | f, fN, dNC
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|QRA64 | : | * | R
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|ISCAT | | * | M N C T
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|MSK144 | & | | N H E
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|===========================================
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Sync character::
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`*` - Normal sync +
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`#` - Alternate sync
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End of line information::
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`?` - Decoded with lower confidence +
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`a` - Decoded with aid of some a priori (AP) information +
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`C` - Confidence indicator [ISCAT and Deep Search; (0-9,*)] +
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`d` - Deep Search algorithm +
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`E` - Size of MSK eye diagram opening - if negative, the eye is closed +
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`f` - Franke-Taylor or Fano algorithm +
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`H` - Number of bit errors corrected +
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`M` - Message length (characters) +
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`N` - Number of Rx intervals or frames averaged +
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`P` - Number indicating type of AP information (Table 1, above) +
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`R` - Return code from QRA64 decoder +
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`T` - Length of analyzed region (s)
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Table 6 below shows the meaning of the return codes R in QRA64 mode.
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[[QRA64_AP_INFO_TABLE]]
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.QRA64 AP return codes
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[width="35%",cols="h10,<m20",frame=topbot,options="header"]
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|===============================================
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|rc | Message components
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|0 | ?     ?     ?
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|1 | CQ     ?     ?
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|2 | CQ     ?
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|3 | MyCall     ?     ?
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|4 | MyCall     ?
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|5 | MyCall DxCall     ?
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|6 | ?     DxCall     ?
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|7 | ?     DxCall
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|8 | MyCall DxCall DxGrid
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|9 | CQ DxCall     ?
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|10 | CQ DxCall
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|11 | CQ DxCall DxGrid
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|===============================================
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@@ -1,51 +0,0 @@
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128
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48
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8
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1 17 34 51 66 81 99 113
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2 18 35 50 67 82 100 114
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3 19 36 52 68 82 101 115
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2 20 36 51 69 83 102 116
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4 19 37 53 66 84 103 117
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5 21 38 54 70 85 92 114
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6 22 39 55 66 85 96 118
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7 23 32 56 71 86 103 119
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8 20 40 55 72 86 104 120
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9 19 41 57 73 87 105 121
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10 24 36 56 74 88 106 122
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10 17 33 47 75 89 107 119
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11 21 42 51 76 87 108 123
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1 25 40 58 74 84 109 124
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12 22 42 49 77 90 110 122
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13 26 43 59 68 89 104 113
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13 22 44 57 75 91 106 125
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12 23 37 46 78 88 109 113
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3 27 34 60 65 87 111 126
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6 27 45 61 79 89 98 114
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14 28 34 62 72 92 107 125
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8 27 42 59 71 92 112 117
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15 20 46 57 79 93 101 117
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9 29 45 62 74 94 108 127
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8 30 38 63 73 95 110 125
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16 29 47 64 69 96 110 128
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16 23 48 63 76 94 111 121
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7 25 39 52 70 97 108 116
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4 26 45 63 67 83 90 126
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15 28 39 50 76 88 103 115
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15 26 33 58 65 97 102 127
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14 31 47 52 77 81 93 121
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14 24 37 61 71 82 99 116
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4 31 40 54 80 91 107 122
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5 32 41 58 77 98 111 120
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9 18 49 65 79 85 104 123
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10 30 43 60 69 84 112 123
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1 18 43 48 73 91 98 119
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3 21 46 64 67 86 112 118
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5 24 48 55 75 93 105 128
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2 32 44 62 80 95 99 124
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16 28 41 59 80 83 100 118
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11 33 35 53 72 96 109 115
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11 25 44 60 78 90 100 128
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6 31 35 56 70 95 102 126
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12 17 50 54 68 94 106 120
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13 29 38 53 78 97 105 124
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7 30 49 61 64 81 101 127
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@@ -0,0 +1,23 @@
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parameter (NN=162)
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parameter (NSPS0=8192) !Samples per symbol at 12000 S/s
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parameter (NDOWN=32)
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parameter (NSPS=NSPS0/NDOWN)
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parameter (NZ=NSPS*NN) !Samples in waveform at 12000 S/s
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parameter (NZ0=NSPS0*NN) !Samples in waveform at 375 S/s
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parameter (NMAX=120*12000) !Samples in waveform at 375 S/s
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! Define the sync vector:
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integer*1 sync(162)
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data sync/ &
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1,1,0,0,0,0,0,0,1,0,0,0,1,1,1,0,0,0,1,0, &
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0,1,0,1,1,1,1,0,0,0,0,0,0,0,1,0,0,1,0,1, &
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0,0,0,0,0,0,1,0,1,1,0,0,1,1,0,1,0,0,0,1, &
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1,0,1,0,0,0,0,1,1,0,1,0,1,0,1,0,1,0,0,1, &
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0,0,1,0,1,1,0,0,0,1,1,0,1,0,1,0,0,0,1,0, &
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0,0,0,0,1,0,0,1,0,0,1,1,1,0,1,1,0,0,1,1, &
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0,1,0,0,0,1,1,1,0,0,0,0,0,1,0,1,0,0,1,1, &
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0,0,0,0,0,0,0,1,1,0,1,0,1,1,0,0,0,1,1,0, &
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0,0/
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