Last change
on this file was
2153,
checked in by murphpo, 11 years ago
|
Initial Tx/Rx PHY models with 64QAM support (incl. redesigned de-interleaver with much lower latency)
|
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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