luaọn aựn toỏt nghieọp Thieỏt Keỏ Tuyeỏn Viba Soỏ

108

void free_space_lose()//ton that tuyen cua khong
gian tu do
{
Ao = 92.5 + 20*log10(f) + 20*log10(d);
printf("Ton that duong truyen cua khong gian tu
do la: %.3lf dB", Ao);
}

void feeder_lose() //ton that feeder
{
double lf1,lf2,feeder_type;
printf("Cho biet loai feeder su dung: \n");
printf("1. RG-59/U\n");
printf("2. RG-11/U\n");
printf("3. RG-24/U\n");
printf("4. RG-58/U\n");
switch(getch())
{
case '1' : feeder_type = 3.4; break;
case '2' : feeder_type = 2.5; break;
case '3' : feeder_type = 2; break;
case '4' : feeder_type = 7.8; break;
default : feeder_type =3.4;
}

printf("\nCho biet do cao anten tai tram A (m):
"); scanf("%lf",&h1);

printf("Cho biet khoang cach tu tram B den
vat chan thu %d: ",i+1);
scanf("%lf",&tmp); d2[i]=tmp;
printf("Cho biet do cao vat chan %d:",i+1);
scanf("%lf",&tmp); hc[i] =tmp;
}
c = 3*pow(10,8);
lamda = c/(f*pow(10,9));
for(i=0;i<vc;i++)
printf("hc = %lf\n",hc[i]);
printf("Lamda = %0.3lf c= %0.3lf\n",lamda,c);
for(i=0;i<vc;i++)
{
V[i] = hc[i] * sqrt( (2/lamda) * (1/d1[i]) *
(1/d2[i]));
printf("\n V[%d] = %lf\n",i+1,V[i]);
}
for(Lv=0,i=0;i<vc;i++)
Lv += 6.4 + 20*log10(sqrt(V[i]+1)) + V[i];
printf("Ton hao cua bo suy hao hoac cac vat
chan: %.3lf dB", Lv);
}
void khiquyen() //ton hao khi quyen
{
double Tkq;
printf("Cho biet ton hao dac trung cua khi quyen
: "); scanf("%lf",&Tkq);
Aa=Tkq*d;
printf("Ton hao khi quyen: %.3lf dB ",Aa);
}

printf("Select: \n");
switch( getch())
{
case '1' : free_space_lose(); break;
case '2' : feeder_lose(); break;
case '3' : vatchan(); break;
case '4' : khiquyen();break;
case '5' : total();break;

}
if(getche() == '6') break ;
}

}

void gain() //do loi
{
double D,n;
clrscr();
printf("\t\tTinh Toan Do Loi\n");
printf("Cho biet cong suat may phat(dBm): ");
scanf("%lf",&pt);
printf("Cho biet duong kinh anten (m): ");
scanf("%lf",&D);
printf("Cho biet goc mo hieu dung: ");
scanf("%lf",&n);
printf("Cho biet nguong thu ung voi BER = 10^-3
(dB): "); scanf("%lf",&RXa);
printf("Cho biet nguong thu ung voi BER = 10^-6
(dB): "); scanf("%lf",&RXb);

double gamma,M,nuy,K,t;
clrscr();
printf("Cho biet he so cai tien dac trung cho dia
hinh a (0.25 - 4): ");
scanf("%lf",&a);
printf("Cho biet he so dia hinh C: \n");
printf(" 1. 1 cho dia hinh trung binh co khi hau
on doi\n");
printf(" 2. 4 cho dia hinh tren mat nuoc bo bien
hay khi hau am uot\n");
printf(" 3. 0.25 cho dia hinh mien nui va khi hau
kho\n");
switch (getch())
{
case '1' : c = 1;printf("C=1"); break;
case '2' : c = 4;printf("C=4"); break;
case '3' : c = 0.25;printf("C=0.25"); break;
default : c=1;
}
printf("\nCho biet alpha2: ");
scanf("%lf",&alpha);
printf("Cho biet beta2: "); scanf("%lf",&beta);
printf("Cho biet c2: "); scanf("%lf",&c2);
printf("Cho biet toc do bit cuc dai gama b
(MBit/s): ");scanf("%lf",&gamma);
printf("Cho biet so muc trong so do dieu che M :
"); scanf("%lf",&M);
printf("Cho biet dang dieu che :\n");
printf("1. QAM 64\n"); printf("2. QAM 16\n");
printf("3. PSK 8\n"); printf("4. PSK 4\n");

if(0.1<po && po<2) nuy =0.182*pow(po,0.1);
if(po<0.01) nuy =1.44*po;
t= pow( 2 * pow(d,1.5) * (gamma / (
log10(M)/log10(2) )) * pow(10,-6),2);
giandoan = 200*nuy*K*t;
tong_giandoan = giandoan + po*pa;
printf("Xac suat fading nhieu tia la: %.8lf\n",
po);
printf("Xac suat dat cac nguong RXa:
%.8lf\n",pa);
printf("Xac suat dat cac nguong RXb:
%.8lf\n",pb);
printf("Khoang thoi gian fading voi BER > 10^-3:
%.8lf\n",Ta);
printf("Khoang thoi gian fading voi BER > 10^-6:
%.8lf\n",Tb);
printf("\nXac suat fading dai hon 10s:
%.8lf",p10);
printf("\nXac suat fading dai hon 60s:
%.8lf",p60);
printf("\n Xac suat BER vuot 10^-3: %.8lf",
pa*po);
printf("\n Xac suat BER vuot 10^-6: %.8lf",
pb*po);
printf("\nDo kha dung cua tuyen: %.8lf %",(1-
po*pa*p10)*100);
printf("\n Xac suat BER vuot 10^-6 trong khoang
60s: %.8lf", pa*p10);
printf("\nXac suat mach tro nen khong su dung
duoc: %.8lf",po*pa*p10);

printf("Do khong su dung duoc do fading nhieu tia
lua chon: %.3lf %\n",100*p10*giandoan);
printf("Tong do khong su dung duoc la:
%.3lf%",tong);
getch();

}
int menu()
{
clrscr();

printf("\n\nTINH CAC THONG SO TON HAO DUONG
TRUYEN\n");
printf("1. Ton that tuyen \n");
printf("2. Do loi\n");
printf("3. Cac hieu ung fading phang\n");
printf("4. tinh toan kha nang su dung\n");
printf("5. Exit\n");
printf("Select:\n");
switch(getch())
{
case '1' : line_lose(); return 1;
case '2' : gain(); return 1;
case '3' : fading(); return 1;
case '4' : khadung(); return 1;
case '5' : return 0;
default : return 1;
luaọn aựn toỏt nghieọp Thieỏt Keỏ Tuyeỏn Viba Soỏ

114

erfd[260]={0.000,0.005,0.010,0.015,0.020,0.025
,0.030,0.035,0.040,0.045,0.050,0.055,0.060,0.065,0
.070,0.075,0.080,0.085,0.090,0.095,0.100,0.105,0.1
10,0.115,0.120,0.125,0.130,0.135,0.140,0.145,0.150
,0.155,0.160,0.165,0.170,0.175,0.180,0.185,0.190,0
.195,0.200,0.205,0.210,0.215,0.220,0.225,0.230,0.2
35,0.240,0.245,0.250,0.255,0.260,0.265,0.270,0.275
,0.280,0.285,0.290,0.295,0.300,0.305,0.310,0.315,0
.320,0.325,0.330,0.335,0.340,0.345,0.350,0.355,0.3
60,0.365,0.370,0.375,0.380,0.385,0.390,0.395,0.400
,0.405,0.410,0.415,0.420,0.425,0.430,0.435,0.440,0
.445,0.450,0.455,0.460,0.465,0.470,0.475,0.480,0.4
85,0.490,0.495,0.500,0.505,0.510,0.515,0.520,0.525
,0.530,0.535,0.540,0.545,0.550,0.555,0.560,0.565,0
.570,0.575,0.580,0.585,0.590,0.595,0.600,0.605,0.6
10,0.615,0.620,0.625,0.630,0.635,0.640,0.645,0.650
,0.655,0.660,0.665,0.670,0.675,0.680,0.685,0.690,0
.695,0.700,0.705,0.710,0.715,0.720,0.725,0.730,0.7
35,0.740,0.745,0.750,0.755,0.760,0.765,0.770,0.775
,0.780,0.785,0.790,0.795,0.800,0.805,0.810,0.815,0
.820,0.825,0.830,0.835,0.840,0.845,0.850,0.855,0.8
60,0.865,0.870,0.875,0.880,0.885,0.890,0.895,0.900
,0.905,0.910,0.915,0.920,0.925,0.930,0.935,0.940,0
.945,0.950,0.955,0.960,0.965,0.970,0.975,0.980,0.9
85,0.990,0.995,1.000,1.050,1.100,1.150,1.200,1.250
,1.300,1.350,1.400,1.450,1.500,1.550,1.600,1.650,1
.700,1.750,1.800,1.850,1.900,1.950,2.000,2.050,2.1
00,2.150,2.200,2.250,2.300,2.350,2.400,2.450,2.500
,2.550,2.600,2.650,2.700,2.750,2.800,2.850,2.900,2
.950,3.000,3.050,3.100,3.150,3.200,3.250,3.300,3.3

0.428384,0.424273,0.420184,0.411619,0.412077,
0.408059,0.404063,0.400092,0.396144,0.392220,
0.388319,0.384442,0.380589,0.376759,0.372954,
0.369172,0.635414,0.361680,0.357971,0.354285,
0.350623,0.346986,0.343372,0.339783,0.336248,
0.332677,0.329600,0.325667,0.332199,0.318755,
0.315334,0.311939,0.308567,0.305219,0.315896,
0.298597,0.295322,0.292071,0.288844,0.285642,
0.282463,0.279309,0.276178,0.273072,0.269990,
0.266931,0.263897,0.260886,0.257899,0.254936,
0.251996,0.249081,0.246189,0.243321,0.240476,
0.237655,0.234857,0.232083,0.229332,0.226604,
0.223900,0.221218,0.218560,0.215925,0.213313,
0.210723,0.208157,0.205613,0.203092,0.200593,
0.198117,0.195664,0.193232,0.190823,0.188436,
0.186072,0.183729,0.181408,0.179109,0.176832,
0.174576,0.172342,0.179130,0.167938,0.165768,
0.163620,0.161492,0.159385,0.157299,0.137564,
0.119795,0.103876,0.089686,0.077100,0.065992,
0.56238,0.047715,0.040305,0.033895,0.028377,
0.023652,0.019624,0.016210,0.013328,0.010901,
0.0088889,0.0072096,0.0058207,0.0046778,0.0037419,
0.0029795,0.0023614,0.0018629,0.0014627,
0.0011432,0.00088929,0.00068853,0.00053060,0.00040
697,0.00031068,0.00023605,0.00017850,0.00013434,0.
00010062,0.000075017,0.000055658,0.000041100,0.000
030205,0.000022092,0.000016081,0.00000011649,0.000
0083987,0.0000060247,0.0000043040,0.0000030593,0.0
000021637,0.0000015200,0.0000010673,0.0000007437,0
.0000005163,0.0000003563,0.0000002433,0.0000001683

truyền khá phức tạp với những công thức khá dài có liên quan với nhau nên dễ bò
sai sót nếu người thực hiện không quen và cẩn thận. Chính vì lí do trên nên em
sử dụng ngôn ngữ C đễ hỗ trợ cho việc tính toán, giúp ngưới thiết kế có thể an
tâm nhập các thông số cần thiết làm giảm đi rất nhiều các công việc tính toán
phức tạp và ít sai số.
 Đây là đề tài khá mới mẻ đối với em. Do thời gian và điều kiện còn hạn chế với
một khối lượng công việc khá lớn. Vì thế những sai sót là điều không thể tránh
khỏi.
 Trong đề tài này tuyếu thiết kế chỉ là một dạng cơ bản của hệ thống Viba
chuyển tiếp mà thôi. Hệ thống không sử dụng trạm lập chưa mang tính chất quốc
tế. Chính vì vậy đề tài này còn có thể được phát triển thêm nếu có điều kiện.
 Rất mong được tiếp tục nghiên cứu áp dụng thiết kế cho những hệ thống có qui
mô lớn.
 Một lần nữa em chân thành cảm ơn Q Thầy, Cô và sự hướng dẫn nhiệt tình
của Thầy NGUYỄN HUY HÙNG, cùng tất cả các bạn đã giúp em hoàn thành
luận án này.

luận án tốt nghiệp Thiết Kế Tuyến Viba Số

118

PHỤ LỤC
Các giá trò hàm lỗi bù erfc(t)
t erfc(t) t Erfc(t) t erfc(t) t erfc(t)
0.000 1.000000 0.005 0.994358 0.010 0.988717 0.015 0.983076

0.020 0.977435 0.025 0.971976 0.030 0.961590 0.035 0.960523

0.040 0.9548889


0.340 0.630635 0.345 0.625618 0.350 0.620618 0.355 0.625635

0.360 0.610667 0.365 0.605723 0.370 0.600794 0.375 0.595883

0.380 0.590990 0.385 0.586117 0.390 0.581261 0.395 0.576425

0.400 0.571608 0.405 0.566810 0.410 0.562031 0.415 0.557272

0.420 0.552532 0.425 0.547813 0.430 0.543113 0.435 0.538434

0.440 0.533773 0.445 0.529136 0.450 0.524518 0.455 0.519921

0.460 0.515345 0.465 0.510789 0.470 0.506255 0.475 0.501742

0.480 0.479250 0.485 0.492780 0.490 0.488332 0.495 0.483905

0.500 0.479500 0.505 0.475117 0.510 0.470756 0.515 0.466418

0.520 0.462101 0.525 0.457807 0.530 0.453536 0.535 0.449287

0.540 0.445061 0.545 0.440857 0.550 0.436677 0.555 0.432519

0.560 0.428384 0.565 0.424273 0.570 0.420184 0.575 0.411619

0.580 0.412077 0.585 0.408059 0.590 0.404063 0.595 0.400092

0.600 0.396144 0.605 0.392220 0.610 0.388319 0.615 0.384442

0.620 0.380589 0.625 0.376759 0.630 0.372954 0.635 0.369172


0.900 0.203092 0.905 0.200593 0.910 0.198117 0.915 0.195664

0.920 0.193232 0.925 0.190823 0.930 0.188436 0.935 0.186072

0.940 0.183729 0.945 0.181408 0.950 0.179109 0.955 0.176832

0.960 0.174576 0.965 0.172342 0.970 0.179103 0.975 0.167938

0.980 0.165768 0.985 0.163620 0.990 0.161492 0.995 0.159385

1.000 0.157299 1.050 0.137564 1.100 0.119795 1.150 0.103876

1.200 0.089686 1.250 0.077100 1.300 0.065992 1.350 0.056238

1.400 0.047715 1.450 0.040305 1.500 0.033895 1.550 0.028377

1.600 0.023652 1.650 0.019624 1.700 0.016210 1.750 0.013328

1.800 0.010901 1.850 8.8889-3 1.900 7.2096-3 1.950 5.8207-3
2.000 4.6778-3 2.050 3.7419-3 2.100 2.9795-3 2.150 2.3614-3
2.200 1.8629-3 2.250 1.4627-3 2.300 1.1432-3 2.350 8.8929-4
2.400 6.6778-4 2.450 5.3060-4 2.500 4.0697-4 2.550 3.1068-4
2.600 2.3605-4 2.650 1.7850-4 2.700 1.3434-4 2.750 1.0062-4
2.800 7.5017-5 2.850 5.5658-5 2.900 4.1100-5 2.950 3.0205-5
3.000 2.2092-5 3.050 1.6081-5 3.100 1.1649-5 3.150 8.3987-6
3.200 6.0247-6 3.250 4.3040-6 3.300 3.0593-6 3.350 2.1637-6
3.400 1.5200-6 3.450 1.0673-6 3.500 7.437-7 3.550 5.163-7
3.600 3.563-7 3.650 2.433-7 3.700 1683-7 3.750 1.137-7
3.800 7.6-8 3.850 5.27-8 3.900 3.53-8 3.950 2.27-8