Real-Time Digital Signal Processing from MATLAB® to C with the TMS320C6x DSPs, Second Edition, 2nd Edition

19.4. DSK IMPLEMENTATION IN C 337

Stage4_A [1]∗ Stage4_I [1] −

55 Stage4_A [2]∗ Stage4_I [2];

Output_I [4] = Stage4_B [0]∗ Stage4_I [0] +

57 Stage4_B [1]∗ Stage4_I [1] +

Stage4_B [2]∗ Stage4_I [2];

59

// update the matched filter ’s state

61 for ( i =0; i <2; i++) {

Stage1_Q [2−i ]=Stage1_Q [(2−i ) −1];

63 Stage2_Q [2−i ]=Stage2_Q [(2−i ) −1];

Stage3_Q [2−i ]=Stage3_Q [(2−i ) −1];

65 Stage4_Q [2−i ]=Stage4_Q [(2−i ) −1];

67 Stage1_I [2−i ]=Stage1_I [(2−i ) −1];

Stage2_I [2−i ]=Stage2_I [(2−i ) −1];

69 Stage3_I [2−i ]=Stage3_I [(2−i ) −1];

Stage4_I [2−i ]=Stage4_I [(2−i ) −1];

71 }

73 // apply the AGC gain

Iscaled [0] = AGCgain ∗Output_I [4];

75 Qscaled [0] =