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802.11a Physical Layer for USRP
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rates.h
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1 
10 #ifndef RATES_H
11 #define RATES_H
12 
13 #include <assert.h>
14 #include <vector>
15 #include <string>
16 
17 namespace fun
18 {
19 
21  static std::vector<unsigned char> VALID_RATES = {0xD, 0xE, 0xF, 0x5, 0x6, 0x7, 0x9, 0xA, 0xB, 0x1, 0x3};
22 
23 
31  enum Rate : int
32  {
33  RATE_1_2_BPSK = 0,
34  RATE_2_3_BPSK = 1,
35  RATE_3_4_BPSK = 2,
36  RATE_1_2_QPSK = 3,
37  RATE_2_3_QPSK = 4,
38  RATE_3_4_QPSK = 5,
39  RATE_1_2_QAM16 = 6,
40  RATE_2_3_QAM16 = 7,
41  RATE_3_4_QAM16 = 8,
42  RATE_2_3_QAM64 = 9,
43  RATE_3_4_QAM64 = 10
44  };
45 
46  // Parameters for each data rate
52  struct RateParams
53  {
54  unsigned char rate_field;
55  int cbps;
56  int dbps;
57  int bpsc;
58  Rate rate;
59  double rel_rate;
60  std::string name;
61 
68  RateParams(Rate _rate)
69  {
70  switch(_rate)
71  {
72  // 1/2 BPSK
73  case RATE_1_2_BPSK:
74  rate_field = 0xD;
75  cbps = 48;
76  dbps = 24;
77  rate = RATE_1_2_BPSK;
78  rel_rate = 1.0;
79  bpsc = 1;
80  name = "1/2 BPSK";
81  break;
82 
83  // 2/3 BPSK
84  case RATE_2_3_BPSK:
85  rate_field = 0xE;
86  cbps = 48;
87  dbps = 32;
88  rate = RATE_2_3_BPSK;
89  rel_rate = 3.0 / 4.0;
90  bpsc = 1;
91  name = "2/3 BPSK";
92  break;
93 
94  // 3/4 BPSK
95  case RATE_3_4_BPSK:
96  rate_field = 0xF;
97  cbps = 48;
98  dbps = 36;
99  rate = RATE_3_4_BPSK;
100  rel_rate = 2.0 / 3.0;
101  bpsc = 1;
102  name = "3/4 BPSK";
103  break;
104 
105  // 1/2 QPSK
106  case RATE_1_2_QPSK:
107  rate_field = 0x5;
108  cbps = 96;
109  dbps = 48;
110  rate = RATE_1_2_QPSK;
111  rel_rate = 1.0;
112  bpsc = 2;
113  name = "1/2 QPSK";
114  break;
115 
116  // 2/3 QPSK
117  case RATE_2_3_QPSK:
118  rate_field = 0x6;
119  cbps = 96;
120  dbps = 64;
121  rate = RATE_2_3_QPSK;
122  rel_rate = 3.0 / 4.0;
123  bpsc = 2;
124  name = "2/3 QPSK";
125  break;
126 
127  // 3/4 QPSK
128  case RATE_3_4_QPSK:
129  rate_field = 0x7;
130  cbps = 96;
131  dbps = 72;
132  rate = RATE_3_4_QPSK;
133  rel_rate = 2.0 / 3.0;
134  bpsc = 2;
135  name = "3/4 QPSK";
136  break;
137 
138  // 1/2 QAM16
139  case RATE_1_2_QAM16:
140  rate_field = 0x9;
141  cbps = 192;
142  dbps = 96;
143  rate = RATE_1_2_QAM16;
144  rel_rate = 1.0;
145  bpsc = 4;
146  name = "1/2 QAM16";
147  break;
148 
149  // 2/3 QAM16
150  case RATE_2_3_QAM16:
151  rate_field = 0xA;
152  cbps = 192;
153  dbps = 128;
154  rate = RATE_2_3_QAM16;
155  rel_rate = 3.0 / 4.0;
156  bpsc = 4;
157  name = "2/3 QAM16";
158  break;
159 
160  // 3/4 QAM16
161  case RATE_3_4_QAM16:
162  rate_field = 0xB;
163  cbps = 192;
164  dbps = 144;
165  rate = RATE_3_4_QAM16;
166  rel_rate = 2.0 / 3.0;
167  bpsc = 4;
168  name = "3/4 QAM16";
169  break;
170 
171  // 2/3 QAM64
172  case RATE_2_3_QAM64:
173  rate_field = 0x1;
174  cbps = 288;
175  dbps = 192;
176  rate = RATE_2_3_QAM64;
177  rel_rate = 3.0 / 4.0;
178  bpsc = 6;
179  name = "2/3 QAM64";
180  break;
181 
182  // 3/4 QAM64
183  case RATE_3_4_QAM64:
184  rate_field = 0x3;
185  cbps = 288;
186  dbps = 216;
187  rate = RATE_3_4_QAM64;
188  rel_rate = 2.0 / 3.0;
189  bpsc = 6;
190  name = "3/4 QAM64";
191  break;
192 
193  default:
194  break;
195  }
196  }
197 
208  static RateParams FromRateField(unsigned char rate_field)
209  {
210  switch(rate_field)
211  {
212  // 1/2 BPSK
213  case 0xD: return RateParams(RATE_1_2_BPSK); break;
214 
215  // 2/3 BPSK
216  case 0xE: return RateParams(RATE_2_3_BPSK); break;
217 
218  // 3/4 BPSK
219  case 0xF: return RateParams(RATE_3_4_BPSK); break;
220 
221  // 1/2 QPSK
222  case 0x5: return RateParams(RATE_1_2_QPSK); break;
223 
224  // 2/3 QPSK
225  case 0x6: return RateParams(RATE_2_3_QPSK); break;
226 
227  // 3/4 QPSK
228  case 0x7: return RateParams(RATE_3_4_QPSK); break;
229 
230  // 1/2 QAM16
231  case 0x9: return RateParams(RATE_1_2_QAM16); break;
232 
233  // 2/3 QAM16
234  case 0xA: return RateParams(RATE_2_3_QAM16); break;
235 
236  // 3/4 QAM16
237  case 0xB: return RateParams(RATE_3_4_QAM16); break;
238 
239  // 2/3 QAM64
240  case 0x1: return RateParams(RATE_2_3_QAM64); break;
241 
242  // 3/4 QAM64
243  case 0x3: return RateParams(RATE_3_4_QAM64); break;
244 
245  default:
246  assert(false);
247  break;
248  }
249  }
250  };
251 }
252 
253 
254 
255 #endif // RATES_H