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Last change
on this file was
2153,
checked in by murphpo, 11 years ago
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Initial Tx/Rx PHY models with 64QAM support (incl. redesigned de-interleaver with much lower latency)
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File size:
2.4 KB
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| 1 | function [mod_order, code_rate, N_CBPS, N_DBPS, valid] = signal_rate_decode_tx(signal_rate) |
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| 2 | |
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| 3 | %Inputs: |
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| 4 | % signal_rate: 4-bit RATE field from received SIGNAL field |
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| 5 | |
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| 6 | %Outputs: |
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| 7 | % mod_order: payload modulation order in bits-per-sym |
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| 8 | % ([1,2,4,6] for [BSPK,QPSK,16-QAM,64-QAM]) |
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| 9 | % code_rate: payload coding rate ([0,1,2] for [1/2, 2/3, 3/4]) |
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| 10 | % valid: 0 when signal_rate is not a valid 4-bit value |
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| 11 | |
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| 12 | BPSK = 1; |
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| 13 | QPSK = 2; |
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| 14 | QAM16 = 4; |
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| 15 | QAM64 = 6; |
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| 16 | |
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| 17 | CODE12 = 0; |
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| 18 | CODE23 = 1; |
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| 19 | CODE34 = 2; |
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| 20 | |
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| 21 | %Coded bits per OFDM symbol |
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| 22 | % Depends only on modulation rate |
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| 23 | N_CPBS_BPSK = 48; |
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| 24 | N_CPBS_QPSK = 96; |
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| 25 | N_CPBS_16QAM = 192; |
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| 26 | N_CPBS_64QAM = 288; |
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| 27 | |
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| 28 | %Data bits per OFDM symbol |
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| 29 | % Depends on modulation and code rates |
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| 30 | N_DBPS_BPSK12 = 24; |
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| 31 | N_DBPS_BPSK34 = 36; |
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| 32 | N_DBPS_QPSK12 = 48; |
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| 33 | N_DBPS_QPSK34 = 72; |
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| 34 | N_DBPS_16QAM12 = 96; |
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| 35 | N_DBPS_16QAM34 = 144; |
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| 36 | N_DBPS_64QAM23 = 192; |
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| 37 | N_DBPS_64QAM34 = 216; |
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| 38 | |
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| 39 | switch double(signal_rate) |
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| 40 | |
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| 41 | case 13 %bin2dec('1101') |
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| 42 | mod_order = BPSK; |
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| 43 | code_rate = CODE12; |
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| 44 | N_CBPS = N_CPBS_BPSK; |
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| 45 | N_DBPS = N_DBPS_BPSK12; |
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| 46 | valid = 1; |
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| 47 | case 15 %bin2dec('1111') |
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| 48 | mod_order = BPSK; |
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| 49 | code_rate = CODE34; |
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| 50 | N_CBPS = N_CPBS_BPSK; |
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| 51 | N_DBPS = N_DBPS_BPSK34; |
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| 52 | valid = 1; |
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| 53 | case 5 %bin2dec('0101') |
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| 54 | mod_order = QPSK; |
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| 55 | code_rate = CODE12; |
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| 56 | N_CBPS = N_CPBS_QPSK; |
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| 57 | N_DBPS = N_DBPS_QPSK12; |
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| 58 | valid = 1; |
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| 59 | case 7 %bin2dec('0111') |
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| 60 | mod_order = QPSK; |
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| 61 | code_rate = CODE34; |
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| 62 | N_CBPS = N_CPBS_QPSK; |
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| 63 | N_DBPS = N_DBPS_QPSK34; |
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| 64 | valid = 1; |
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| 65 | case 9 %bin2dec('1001') |
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| 66 | mod_order = QAM16; |
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| 67 | code_rate = CODE12; |
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| 68 | N_CBPS = N_CPBS_16QAM; |
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| 69 | N_DBPS = N_DBPS_16QAM12; |
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| 70 | valid = 1; |
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| 71 | case 11 %bin2dec('1011') |
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| 72 | mod_order = QAM16; |
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| 73 | code_rate = CODE34; |
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| 74 | N_CBPS = N_CPBS_16QAM; |
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| 75 | N_DBPS = N_DBPS_16QAM34; |
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| 76 | valid = 1; |
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| 77 | case 1 %bin2dec('0001') |
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| 78 | mod_order = QAM64; |
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| 79 | code_rate = CODE23; |
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| 80 | N_CBPS = N_CPBS_64QAM; |
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| 81 | N_DBPS = N_DBPS_64QAM23; |
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| 82 | valid = 1; |
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| 83 | case 3 %bin2dec('0011') |
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| 84 | mod_order = QAM64; |
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| 85 | code_rate = CODE34; |
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| 86 | N_CBPS = N_CPBS_64QAM; |
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| 87 | N_DBPS = N_DBPS_64QAM34; |
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| 88 | valid = 1; |
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| 89 | otherwise |
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| 90 | mod_order = BPSK; |
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| 91 | code_rate = CODE12; |
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| 92 | N_CBPS = N_CPBS_BPSK; |
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| 93 | N_DBPS = N_DBPS_BPSK12; |
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| 94 | valid = 0; |
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| 95 | end %end switch |
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| 96 | |
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| 97 | end %end function |
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| 98 | |
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