Institutional Repository | Satya Wacana Christian University: Simulator Modulasi dan Demodulasi Digital Menggunakan Perangkat Lunak MATLAB
SIMULATOR MODULASI DAN DEMODULASI DIGITAL MENGGUNAKAN
PERANGKAT LUNAK MATLAB
oleh
Elisabeth Cesara Aprilia
NIM : 612009011
Skripsi
Untuk melengkapi salah satu syarat memperoleh
Gelas Sarjana Teknik
Program Studi Teknik Elektro
Fakultas Teknik Elektronika dan Komputer
Universitas Kristen Satya Wacana
Salatiga
Mei 2015
ii
INTISARI
Dalam sistem komunikasi, data yang hendak dikirimkan akan dimodulasi terlebih
dahulu sebelum dikirim, dan didemodulasi sebelum sampai ke penerima. Secara garis
besar ada 2 teknik modulasi yaitu modulasi analog dan digital. Dibandingkan dengan
modulasi analog, modulasi digital lebih menjamin keamanan data saat dikirimkan,
mampu mengirimkan data dengan kapasitas yang lebih besar dan lebih cepat, dan
memiliki tingkat error yang lebih kecil. Teknik modulasi digital memiliki bermacammacam jenis hal ini membutuhkan penjelasan yang rinci, agar mahasiswa dapat
memahami perbedaan proses masing-masing teknik modulasi digital tersebut. Teknikteknik modulasi tersebut akan lebih mudah dipahami apabila mahasiswa bisa melihat
proses modulasi dengan menggunakan alat peraga yang dapat menggambarkan setiap
proses modulasi tersebut. Simulator modulasi digital dengan menggunakan perangkat
lunak Matlab sebagai alat peraga perkuliahan menjadi pilihan untuk membantu
mahasiswa memahami teknik-teknik modulasi digital. Dalam simulator ini terdapat 8
ragam modulasi digital yaitu Binary Amplitude Shift Keying (BASK), On-Off Shift Keying
(OOK), Binary Frequency Shift Keying (BFSK), Differential Phase Shift Keying (DPSK),
Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Offset
Quadrature Phase Shift Keying (OQPSK), dan Quadrature Amplitide Modulation
(QAM).
Kata Kunci: Modulasi Digital, Simulator
iii
ABSTRACT
In communication system, the will be sent data must be modulated first and
demodulated before reach the receiver. There are two main technical modulator, they are
analog and digital modulation. Compared with analog modulation, digital modulation is
saver when being transmitted. Digital modulation is capable to send bigger data and it is
faster as it has little errors level. Digital modulation technology has many different kinds
which needs some details and explanation, so that students can understand the difference
process for each digital modulation. Those modulation technologies would be easier to be
understood if students can see the modulation process that are using the acting tools
which can described every modulation process. Digital modulation simulator that is using
Matlab software as class sample tool has been chosen to help the students to better
understand the digital modulation technology. In this simulator there are 9 varieties of
digital modulation they are Binary Amplitude Shift Keying (BASK), On-Off Shift Keying
(OOK), Binary Frequency Shift Keying (BFSK), Differential Phase Shift Keying (DPSK),
Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Offset
Quadrature Phase Shift Keying (OQPSK), dan Quadrature Amplitide Modulation
(QAM).
Keywords: Digital Modulation, Simulator
iv
KATA PENGANTAR
Atas berkat dan karunia dari Tuhan Yang Maha Esa, penulis dapat menyusun dan
menyelesaikan skrispi berjudul “Simulator Modulasi Digital Dengan Perangkat Lunak
Matlab”. Skripsi ini merupakan syarat untuk menyelesaikan studi di Fakultas Teknik
Elektronika Universitas Kristen Satya Wacana.
Penulis menyadari bahwa tanpa adanya bantuan dan bimbingan dari berbagai
pihak, maka penyusunan skripsi ini tidak akan diselesaikan dengan baik, maka dalam
kesempatan kali ini pnulis mengucapkan banyak terima kasih kepada:
1. Ibu Eva Yovita, MT selaku dosen pembimbing I yang telah membantu
kesulitan memahami teori serta membantu penyusunan serta penyelesaian
skripsi.
2. Bapak Andreas A.F, MT selaku dosen pembimbing II yang telah memberikan
revisi-revisi yang teliti dalam penulisan skripsi sehingga skripsi ini dapat
selesai.
3. Ibu Ivanna K. Timotius yang memotivasi untuk segera mengerjakan skripsi
dan segera menyelesaikan studi di Fakultas Teknik Elektronika UKSW.
4. Seluruh staff dan karyawan TU yang membantu dan memberikan informasi
dan membantu penulis.
5. Keluarga penulis yang selalau memberikan semangat dan dukungan moril
maupun materiil.
6. Seluruh teman-teman angkatan 2009 yang selalu memotivasi penulis untuk
menyelesaikan skripsi.
7. Semua pihak yang tidak dapat kami sebutkan satu per satu yang telah
membantu penulis selama penyusunan dan penyelesaian skripsi.
Salatiga, 13 Maret 2015
Penulis
v
DAFTAR ISI
INTISARI ..................................................................................................................i
ABSTRACT ...............................................................................................................ii
KATA PENGANTAR ...............................................................................................iii
DAFTAR ISI..............................................................................................................iv
DAFTAR GAMBAR .................................................................................................vi
DAFTAR TABEL ......................................................................................................ix
DAFTAR SINGKATAN ...........................................................................................x
BAB I PENDAHULUAN ..........................................................................................1
1.1
TUJUAN .........................................................................................1
1.2
LATAR BELAKANG ....................................................................1
1.3
BATASAN MASALAH .................................................................3
1.4
SISTEMATIKA PENULISAN .......................................................3
BAB II DASAR TEORI ............................................................................................4
2.1
2.2
ASK (Amplitude Shift Keying).........................................................4
2.1.1
OOK (On-Off Keying) ........................................................4
2.1.2
BASK (Binary Amplitude Shift Keying) .............................5
FSK (Frequency Shift Keying) .......................................................5
2.2.1
2.3
2.4
BFSK (Binary Frequency Shift Keying).............................5
PSK (Phase Shift Keying) ..............................................................6
2.3.1
BPSK (Binary Phase Shift Keying) ....................................6
2.3.2
DPSK (Differential Phase Shift Keying) ............................7
2.3.3
QPSK (Quadrature Phase Shift Keying)............................8
2.3.4
OQPSK (Offset Quadrature Phase Shift Keying) ..............11
QAM (Quadrature Amplitude Modulation) ....................................13
BAB III PERANCANGAN DAN PEDOMAN PENGGUNAAN ALAT ................15
3.1
Perancangan ....................................................................................15
3.1.1
Simulator Modulasi BASK ..................................................16
3.1.2
Simulator Modulasi OOK ...................................................17
3.1.3
Simulator Modulasi BFSK ..................................................18
3.1.4
Simulator Modulasi BPSK ..................................................19
vi
3.1.5
Simulator Modulasi DPSK..................................................20
3.1.6
Simulator Modulasi QPSK..................................................21
3.1.7
Simulator Modulasi OQPSK...............................................22
3.1.8
Simulator Modulasi QAM ...................................................23
BAB IV HASIL PENGUJIAN ALAT DAN ANALISISNYA .................................17
4.1. Hasil Pengujian Alat dan Analisinya ..............................................25
4.1.1. BASK ...................................................................................25
4.1.2. OOK ....................................................................................27
4.1.3. BFSK ...................................................................................29
4.1.4. BPSK ...................................................................................31
4.1.5. DPSK...................................................................................32
4.1.6. QPSK...................................................................................33
4.1.7. OQPSK................................................................................35
4.1.8. QAM ....................................................................................36
4.2. Hasil Pengujian Simulator Oleh Responden ...................................39
BAB V KESIMPULAN DAN SARAN ....................................................................42
5.1. Kesimpulan .....................................................................................42
5.2. Saran ...............................................................................................42
DAFTAR PUSTAKA
LAMPIRAN ...............................................................................................................44
1
Simulator Modulasi BASK…………. ...............................................44
2
Simulator Modulasi OOK ...............................................................48
3
Simulator Modulasi BFSK ..............................................................50
4
Simulator Modulasi BPSK ..............................................................52
5
Simulator Modulasi DPSK..............................................................55
6
Simulator Modulasi QPSK..............................................................57
7
Simulator Modulasi OQPSK...........................................................60
8
Simulator Modulasi QAM ...............................................................62
vii
DAFTAR GAMBAR
Gambar 2.1
On-Off Shift Keying (OOK) .........................................................4
Gambar 2.2
Modulasi BASK ............................................................................5
Gambar 2.3
Modulasi BFSK ............................................................................6
Gambar 2.4
Diagram Konstelasi BPSK ...........................................................7
Gambar 2.5
Isyarat Termodulasi BPSK ...........................................................7
Gambar 2.6
Kotak Diagram Modulasi DPSK..................................................8
Gambar 2.7
Diagram Konstelasi QPSK...........................................................9
Gambar 2.8
Pemisahan Bit Genap dan Bit Gasal.............................................9
Gambar 2.9
Isyarat Termodulasi QPSK ..........................................................10
Gambar 2.10
Pergeseran Fase Isyarat Masukan ................................................11
Gambar 2.11
Isyarat Termodulasi OQPSK........................................................12
Gambar 2.12
Isyarat Termodulasi 8-QAM ........................................................14
Gambar 2.13
Diagram Konstelasi 8-QAM.........................................................14
Gambar 3.1
Tampilan Awal Simulator Modulasi Digital................................15
Gambar 3.2
Tampilan Menu Utama Simulator Modulasi Digital ...................15
Gambar 3.3
Tampilan Keseluruhan Simulator Modulasi BASK......................16
Gambar 3.4
Tampilan Keseluruhan Simulator Modulasi OOK.......................17
Gambar 3.5
Tampilan Keseluruhan Simulator Modulasi BFSK......................18
Gambar 3.6
Tampilan Keseluruhan Simulator Modulasi BPSK......................19
Gambar 3.7
Tampilan Keseluruhan Simulator Modulasi DPSK .....................20
Gambar 3.8
Tampilan Keseluruhan Simulator Modulasi QPSK .....................21
Gambar 3.9
Tampilan Keseluruhan Simulator Modulasi OQPSK ..................22
Gambar 3.10
Tampilan Keseluruhan Simulator Modulasi QAM ......................23
Gambar 4.1.(a)
Isyarat Digital Masukan ...............................................................25
Gambar 4.1.(b)
Isyarat Pembawa Bit ‘0’ ...............................................................25
Gambar 4.1.(c)
Isyarat Pembawa Bit ‘1’ ...............................................................25
Gambar 4.1.(d)
Isyarat Hasil Modulasi BASK.......................................................25
Gambar 4.2.(a)
Isyarat Hasil Demodulasi BASK Nilai Patokan Sesuai Syarat .....26
Gambar 4.2.(b)
Isyarat Hasil Demodulasi BASK Nilai Patokan > (A1) ................26
Gambar 4.2.(c)
Isyarat Hasil Demodulasi BASK Nilai Patokan < (A2) ................26
viii
Gambar 4.3.(a)
Isyarat Digital Masukan ...............................................................27
Gambar 4.3.(b)
Isyarat Pembawa ..........................................................................27
Gambar 4.3.(c)
Isyarat Hasil Modulasi OOK........................................................27
Gambar 4.4.(a)
Isyarat Hasil Demodulasi OOK Nilai Patokan Sesuai Syarat ......28
Gambar 4.4.(b)
Isyarat Hasil Demodulasi OOK Nilai Patokan < 0 ......................28
Gambar 4.4.(c)
Isyarat Hasil Demodulasi OOK Nilai Patokan > A .....................28
Gambar 4.5.(a)
Isyarat Digital Masukan ...............................................................29
Gambar 4.5.(b)
Isyarat Pembawa Bit ‘0’ ...............................................................29
Gambar 4.5.(c)
Isyarat Pembawa Bit ‘1’ ...............................................................29
Gambar 4.5.(d)
Isyarat Hasil Modulasi BFSK.......................................................29
Gambar 4.6.(a)
Isyarat Hasil Demodulasi BFSK (
) .....................................30
Gambar 4.6.(b)
Isyarat Hasil Demodulasi BFSK (
) .....................................30
Gambar 4.7.(a)
Isyarat Digital Masukan ...............................................................31
Gambar 4.7.(b)
Isyarat Pembawa ..........................................................................31
Gambar 4.7.(c)
Isyarat Hasil Modulasi BPSK.......................................................31
Gambar 4.8.(a)
Isyarat Hasil Demodulasi BPSK Nilai Patokan Sesuai Syarat .....32
Gambar 4.8.(b)
Isyarat Hasil Demodulasi BPSK Nilai Patokan > A ....................32
Gambar 4.9.(a)
Isyarat Digital Masukan ...............................................................33
Gambar 4.9.(b)
Isyarat Pembawa ..........................................................................33
Gambar 4.9.(c)
Isyarat Hasil Ter-XNOR ..............................................................33
Gambar 4.9.(b)
Isyarat Hasil Modulasi DPSK ......................................................33
Gambar 4.10.(a) Isyarat Digital Masukan ...............................................................34
Gambar 4.10.(b) Isyarat Gasal.................................................................................34
Gambar 4.10.(b) Isyarat Genap ...............................................................................34
Gambar 4.10.(b) Isyarat Hasil Modulasi QPSK ......................................................34
Gambar 4.11.(a) Isyarat Digital Masukan ...............................................................35
Gambar 4.11.(b) Isyarat Gasal.................................................................................35
Gambar 4.11.(b) Isyarat Genap ...............................................................................35
Gambar 4.11.(b) Isyarat Hasil Modulasi OQPSK ...................................................35
Gambar 4.12.(a) Isyarat Digital Masukan ...............................................................36
Gambar 4.12.(b) Isyarat Termodulasi 4-QAM ........................................................36
ix
Gambar 4.13.(a) Isyarat Digital Masukan ...............................................................36
Gambar 4.13.(b) Isyarat Termodulasi 8-QAM ........................................................36
Gambar 4.14.(a) Isyarat Digital Masukan ...............................................................37
Gambar 4.14.(b) Isyarat Termodulasi 16-QAM ......................................................37
Gambar 4.15
Cara Kerja Modulasi 8-QAM .......................................................38
x
DAFTAR TABEL
Tabel 2.1 Tabel Kebenaran Gerbang Logika XNOR ...............................................8
Tabel 2.2 Tabel Ilustrasi Proses XNOR ...................................................................8
Tabel 4.1 Kuesioner Responden ..............................................................................39
Tabel 4.2 Hasil Kuesioner ........................................................................................40
Tabel 4.3 Analisis Hasil Kuesioner..........................................................................41
xi
DAFTAR SINGKATAN
BASK
= Binary Amplitude Shift Keying
OOK
= On-Off Keying
BFSK
= Binary Frequency Shift Keying
MSK
= Minimum Shift Keying
BPSK
= Binary Phase Shift Keying
DPSK
= Differential Phase Shift Keying
QPSK
= Quadrature Phase Shift Keying
OQPSK = Offset Quadrature Phase Shift Keying
QAM
= Quadrature Amplitude Shift Keying
LPF
= Low Pass Filter
xii
PERANGKAT LUNAK MATLAB
oleh
Elisabeth Cesara Aprilia
NIM : 612009011
Skripsi
Untuk melengkapi salah satu syarat memperoleh
Gelas Sarjana Teknik
Program Studi Teknik Elektro
Fakultas Teknik Elektronika dan Komputer
Universitas Kristen Satya Wacana
Salatiga
Mei 2015
ii
INTISARI
Dalam sistem komunikasi, data yang hendak dikirimkan akan dimodulasi terlebih
dahulu sebelum dikirim, dan didemodulasi sebelum sampai ke penerima. Secara garis
besar ada 2 teknik modulasi yaitu modulasi analog dan digital. Dibandingkan dengan
modulasi analog, modulasi digital lebih menjamin keamanan data saat dikirimkan,
mampu mengirimkan data dengan kapasitas yang lebih besar dan lebih cepat, dan
memiliki tingkat error yang lebih kecil. Teknik modulasi digital memiliki bermacammacam jenis hal ini membutuhkan penjelasan yang rinci, agar mahasiswa dapat
memahami perbedaan proses masing-masing teknik modulasi digital tersebut. Teknikteknik modulasi tersebut akan lebih mudah dipahami apabila mahasiswa bisa melihat
proses modulasi dengan menggunakan alat peraga yang dapat menggambarkan setiap
proses modulasi tersebut. Simulator modulasi digital dengan menggunakan perangkat
lunak Matlab sebagai alat peraga perkuliahan menjadi pilihan untuk membantu
mahasiswa memahami teknik-teknik modulasi digital. Dalam simulator ini terdapat 8
ragam modulasi digital yaitu Binary Amplitude Shift Keying (BASK), On-Off Shift Keying
(OOK), Binary Frequency Shift Keying (BFSK), Differential Phase Shift Keying (DPSK),
Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Offset
Quadrature Phase Shift Keying (OQPSK), dan Quadrature Amplitide Modulation
(QAM).
Kata Kunci: Modulasi Digital, Simulator
iii
ABSTRACT
In communication system, the will be sent data must be modulated first and
demodulated before reach the receiver. There are two main technical modulator, they are
analog and digital modulation. Compared with analog modulation, digital modulation is
saver when being transmitted. Digital modulation is capable to send bigger data and it is
faster as it has little errors level. Digital modulation technology has many different kinds
which needs some details and explanation, so that students can understand the difference
process for each digital modulation. Those modulation technologies would be easier to be
understood if students can see the modulation process that are using the acting tools
which can described every modulation process. Digital modulation simulator that is using
Matlab software as class sample tool has been chosen to help the students to better
understand the digital modulation technology. In this simulator there are 9 varieties of
digital modulation they are Binary Amplitude Shift Keying (BASK), On-Off Shift Keying
(OOK), Binary Frequency Shift Keying (BFSK), Differential Phase Shift Keying (DPSK),
Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Offset
Quadrature Phase Shift Keying (OQPSK), dan Quadrature Amplitide Modulation
(QAM).
Keywords: Digital Modulation, Simulator
iv
KATA PENGANTAR
Atas berkat dan karunia dari Tuhan Yang Maha Esa, penulis dapat menyusun dan
menyelesaikan skrispi berjudul “Simulator Modulasi Digital Dengan Perangkat Lunak
Matlab”. Skripsi ini merupakan syarat untuk menyelesaikan studi di Fakultas Teknik
Elektronika Universitas Kristen Satya Wacana.
Penulis menyadari bahwa tanpa adanya bantuan dan bimbingan dari berbagai
pihak, maka penyusunan skripsi ini tidak akan diselesaikan dengan baik, maka dalam
kesempatan kali ini pnulis mengucapkan banyak terima kasih kepada:
1. Ibu Eva Yovita, MT selaku dosen pembimbing I yang telah membantu
kesulitan memahami teori serta membantu penyusunan serta penyelesaian
skripsi.
2. Bapak Andreas A.F, MT selaku dosen pembimbing II yang telah memberikan
revisi-revisi yang teliti dalam penulisan skripsi sehingga skripsi ini dapat
selesai.
3. Ibu Ivanna K. Timotius yang memotivasi untuk segera mengerjakan skripsi
dan segera menyelesaikan studi di Fakultas Teknik Elektronika UKSW.
4. Seluruh staff dan karyawan TU yang membantu dan memberikan informasi
dan membantu penulis.
5. Keluarga penulis yang selalau memberikan semangat dan dukungan moril
maupun materiil.
6. Seluruh teman-teman angkatan 2009 yang selalu memotivasi penulis untuk
menyelesaikan skripsi.
7. Semua pihak yang tidak dapat kami sebutkan satu per satu yang telah
membantu penulis selama penyusunan dan penyelesaian skripsi.
Salatiga, 13 Maret 2015
Penulis
v
DAFTAR ISI
INTISARI ..................................................................................................................i
ABSTRACT ...............................................................................................................ii
KATA PENGANTAR ...............................................................................................iii
DAFTAR ISI..............................................................................................................iv
DAFTAR GAMBAR .................................................................................................vi
DAFTAR TABEL ......................................................................................................ix
DAFTAR SINGKATAN ...........................................................................................x
BAB I PENDAHULUAN ..........................................................................................1
1.1
TUJUAN .........................................................................................1
1.2
LATAR BELAKANG ....................................................................1
1.3
BATASAN MASALAH .................................................................3
1.4
SISTEMATIKA PENULISAN .......................................................3
BAB II DASAR TEORI ............................................................................................4
2.1
2.2
ASK (Amplitude Shift Keying).........................................................4
2.1.1
OOK (On-Off Keying) ........................................................4
2.1.2
BASK (Binary Amplitude Shift Keying) .............................5
FSK (Frequency Shift Keying) .......................................................5
2.2.1
2.3
2.4
BFSK (Binary Frequency Shift Keying).............................5
PSK (Phase Shift Keying) ..............................................................6
2.3.1
BPSK (Binary Phase Shift Keying) ....................................6
2.3.2
DPSK (Differential Phase Shift Keying) ............................7
2.3.3
QPSK (Quadrature Phase Shift Keying)............................8
2.3.4
OQPSK (Offset Quadrature Phase Shift Keying) ..............11
QAM (Quadrature Amplitude Modulation) ....................................13
BAB III PERANCANGAN DAN PEDOMAN PENGGUNAAN ALAT ................15
3.1
Perancangan ....................................................................................15
3.1.1
Simulator Modulasi BASK ..................................................16
3.1.2
Simulator Modulasi OOK ...................................................17
3.1.3
Simulator Modulasi BFSK ..................................................18
3.1.4
Simulator Modulasi BPSK ..................................................19
vi
3.1.5
Simulator Modulasi DPSK..................................................20
3.1.6
Simulator Modulasi QPSK..................................................21
3.1.7
Simulator Modulasi OQPSK...............................................22
3.1.8
Simulator Modulasi QAM ...................................................23
BAB IV HASIL PENGUJIAN ALAT DAN ANALISISNYA .................................17
4.1. Hasil Pengujian Alat dan Analisinya ..............................................25
4.1.1. BASK ...................................................................................25
4.1.2. OOK ....................................................................................27
4.1.3. BFSK ...................................................................................29
4.1.4. BPSK ...................................................................................31
4.1.5. DPSK...................................................................................32
4.1.6. QPSK...................................................................................33
4.1.7. OQPSK................................................................................35
4.1.8. QAM ....................................................................................36
4.2. Hasil Pengujian Simulator Oleh Responden ...................................39
BAB V KESIMPULAN DAN SARAN ....................................................................42
5.1. Kesimpulan .....................................................................................42
5.2. Saran ...............................................................................................42
DAFTAR PUSTAKA
LAMPIRAN ...............................................................................................................44
1
Simulator Modulasi BASK…………. ...............................................44
2
Simulator Modulasi OOK ...............................................................48
3
Simulator Modulasi BFSK ..............................................................50
4
Simulator Modulasi BPSK ..............................................................52
5
Simulator Modulasi DPSK..............................................................55
6
Simulator Modulasi QPSK..............................................................57
7
Simulator Modulasi OQPSK...........................................................60
8
Simulator Modulasi QAM ...............................................................62
vii
DAFTAR GAMBAR
Gambar 2.1
On-Off Shift Keying (OOK) .........................................................4
Gambar 2.2
Modulasi BASK ............................................................................5
Gambar 2.3
Modulasi BFSK ............................................................................6
Gambar 2.4
Diagram Konstelasi BPSK ...........................................................7
Gambar 2.5
Isyarat Termodulasi BPSK ...........................................................7
Gambar 2.6
Kotak Diagram Modulasi DPSK..................................................8
Gambar 2.7
Diagram Konstelasi QPSK...........................................................9
Gambar 2.8
Pemisahan Bit Genap dan Bit Gasal.............................................9
Gambar 2.9
Isyarat Termodulasi QPSK ..........................................................10
Gambar 2.10
Pergeseran Fase Isyarat Masukan ................................................11
Gambar 2.11
Isyarat Termodulasi OQPSK........................................................12
Gambar 2.12
Isyarat Termodulasi 8-QAM ........................................................14
Gambar 2.13
Diagram Konstelasi 8-QAM.........................................................14
Gambar 3.1
Tampilan Awal Simulator Modulasi Digital................................15
Gambar 3.2
Tampilan Menu Utama Simulator Modulasi Digital ...................15
Gambar 3.3
Tampilan Keseluruhan Simulator Modulasi BASK......................16
Gambar 3.4
Tampilan Keseluruhan Simulator Modulasi OOK.......................17
Gambar 3.5
Tampilan Keseluruhan Simulator Modulasi BFSK......................18
Gambar 3.6
Tampilan Keseluruhan Simulator Modulasi BPSK......................19
Gambar 3.7
Tampilan Keseluruhan Simulator Modulasi DPSK .....................20
Gambar 3.8
Tampilan Keseluruhan Simulator Modulasi QPSK .....................21
Gambar 3.9
Tampilan Keseluruhan Simulator Modulasi OQPSK ..................22
Gambar 3.10
Tampilan Keseluruhan Simulator Modulasi QAM ......................23
Gambar 4.1.(a)
Isyarat Digital Masukan ...............................................................25
Gambar 4.1.(b)
Isyarat Pembawa Bit ‘0’ ...............................................................25
Gambar 4.1.(c)
Isyarat Pembawa Bit ‘1’ ...............................................................25
Gambar 4.1.(d)
Isyarat Hasil Modulasi BASK.......................................................25
Gambar 4.2.(a)
Isyarat Hasil Demodulasi BASK Nilai Patokan Sesuai Syarat .....26
Gambar 4.2.(b)
Isyarat Hasil Demodulasi BASK Nilai Patokan > (A1) ................26
Gambar 4.2.(c)
Isyarat Hasil Demodulasi BASK Nilai Patokan < (A2) ................26
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Gambar 4.3.(a)
Isyarat Digital Masukan ...............................................................27
Gambar 4.3.(b)
Isyarat Pembawa ..........................................................................27
Gambar 4.3.(c)
Isyarat Hasil Modulasi OOK........................................................27
Gambar 4.4.(a)
Isyarat Hasil Demodulasi OOK Nilai Patokan Sesuai Syarat ......28
Gambar 4.4.(b)
Isyarat Hasil Demodulasi OOK Nilai Patokan < 0 ......................28
Gambar 4.4.(c)
Isyarat Hasil Demodulasi OOK Nilai Patokan > A .....................28
Gambar 4.5.(a)
Isyarat Digital Masukan ...............................................................29
Gambar 4.5.(b)
Isyarat Pembawa Bit ‘0’ ...............................................................29
Gambar 4.5.(c)
Isyarat Pembawa Bit ‘1’ ...............................................................29
Gambar 4.5.(d)
Isyarat Hasil Modulasi BFSK.......................................................29
Gambar 4.6.(a)
Isyarat Hasil Demodulasi BFSK (
) .....................................30
Gambar 4.6.(b)
Isyarat Hasil Demodulasi BFSK (
) .....................................30
Gambar 4.7.(a)
Isyarat Digital Masukan ...............................................................31
Gambar 4.7.(b)
Isyarat Pembawa ..........................................................................31
Gambar 4.7.(c)
Isyarat Hasil Modulasi BPSK.......................................................31
Gambar 4.8.(a)
Isyarat Hasil Demodulasi BPSK Nilai Patokan Sesuai Syarat .....32
Gambar 4.8.(b)
Isyarat Hasil Demodulasi BPSK Nilai Patokan > A ....................32
Gambar 4.9.(a)
Isyarat Digital Masukan ...............................................................33
Gambar 4.9.(b)
Isyarat Pembawa ..........................................................................33
Gambar 4.9.(c)
Isyarat Hasil Ter-XNOR ..............................................................33
Gambar 4.9.(b)
Isyarat Hasil Modulasi DPSK ......................................................33
Gambar 4.10.(a) Isyarat Digital Masukan ...............................................................34
Gambar 4.10.(b) Isyarat Gasal.................................................................................34
Gambar 4.10.(b) Isyarat Genap ...............................................................................34
Gambar 4.10.(b) Isyarat Hasil Modulasi QPSK ......................................................34
Gambar 4.11.(a) Isyarat Digital Masukan ...............................................................35
Gambar 4.11.(b) Isyarat Gasal.................................................................................35
Gambar 4.11.(b) Isyarat Genap ...............................................................................35
Gambar 4.11.(b) Isyarat Hasil Modulasi OQPSK ...................................................35
Gambar 4.12.(a) Isyarat Digital Masukan ...............................................................36
Gambar 4.12.(b) Isyarat Termodulasi 4-QAM ........................................................36
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Gambar 4.13.(a) Isyarat Digital Masukan ...............................................................36
Gambar 4.13.(b) Isyarat Termodulasi 8-QAM ........................................................36
Gambar 4.14.(a) Isyarat Digital Masukan ...............................................................37
Gambar 4.14.(b) Isyarat Termodulasi 16-QAM ......................................................37
Gambar 4.15
Cara Kerja Modulasi 8-QAM .......................................................38
x
DAFTAR TABEL
Tabel 2.1 Tabel Kebenaran Gerbang Logika XNOR ...............................................8
Tabel 2.2 Tabel Ilustrasi Proses XNOR ...................................................................8
Tabel 4.1 Kuesioner Responden ..............................................................................39
Tabel 4.2 Hasil Kuesioner ........................................................................................40
Tabel 4.3 Analisis Hasil Kuesioner..........................................................................41
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DAFTAR SINGKATAN
BASK
= Binary Amplitude Shift Keying
OOK
= On-Off Keying
BFSK
= Binary Frequency Shift Keying
MSK
= Minimum Shift Keying
BPSK
= Binary Phase Shift Keying
DPSK
= Differential Phase Shift Keying
QPSK
= Quadrature Phase Shift Keying
OQPSK = Offset Quadrature Phase Shift Keying
QAM
= Quadrature Amplitude Shift Keying
LPF
= Low Pass Filter
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