1 //
2 //
3 //
4
5 #include <stdio.h>
6 #include <math.h>
7 #include <string.h>
8
9 #include "liquid.h"
10
11 #define OUTPUT_FILENAME "ofdmframegen_example.m"
12
main()13 int main() {
14 // options
15 unsigned int num_subcarriers=64;//
16 unsigned int cp_len=16; // cyclic prefix length
17 //unsigned int num_symbols=2; // number of ofdm symbols
18
19 //
20 unsigned int frame_len = num_subcarriers + cp_len;
21
22 //unsigned int num_samples = num_subcarriers * num_frames;
23
24 // create synthesizer/analyzer objects
25 ofdmframegen fg = ofdmframegen_create(num_subcarriers, cp_len);
26 ofdmframegen_print(fg);
27
28 FILE*fid = fopen(OUTPUT_FILENAME,"w");
29 fprintf(fid,"%% %s: auto-generated file\n\n", OUTPUT_FILENAME);
30 fprintf(fid,"clear all;\nclose all;\n\n");
31 fprintf(fid,"num_subcarriers=%u;\n", num_subcarriers);
32 fprintf(fid,"cp_len=%u;\n", cp_len);
33 fprintf(fid,"frame_len=%u;\n", frame_len);
34
35 fprintf(fid,"X = zeros(1,num_subcarriers);\n");
36 fprintf(fid,"x = zeros(1,frame_len);\n");
37
38 unsigned int i;
39 float complex X[num_subcarriers]; // channelized symbols
40 float complex x[frame_len]; // time-domain samples
41
42 for (i=0; i<num_subcarriers; i++) {
43 X[i] = i==4 ? 0.707f + _Complex_I*0.707f : 0.0f;
44 }
45
46 ofdmframegen_execute(fg,X,x);
47
48 //
49 for (i=0; i<num_subcarriers; i++)
50 fprintf(fid,"X(%3u) = %12.4e + j*%12.4e;\n", i+1, crealf(X[i]), cimagf(X[i]));
51
52 //
53 for (i=0; i<frame_len; i++)
54 fprintf(fid,"x(%3u) = %12.4e + j*%12.4e;\n", i+1, crealf(x[i]), cimagf(x[i]));
55
56 // print results
57 fprintf(fid,"\n\n");
58 fprintf(fid,"figure;\n");
59 fprintf(fid,"t=0:(frame_len-1);\n");
60 fprintf(fid,"plot(t,real(x),t,imag(x));\n");
61
62 fclose(fid);
63 printf("results written to %s\n", OUTPUT_FILENAME);
64
65 // destroy objects
66 ofdmframegen_destroy(fg);
67
68 printf("done.\n");
69 return 0;
70 }
71
72