Electronics and Telecommunications ICRAMET 2014
Batam – Indonesia | 7 – 8 May 2014
ICRAMET
119
Pembangkitan bit acak
Mapping
+ +
+ +
Detektor
Demapping
AWGN
Rayleigh Fading
AWGN
Rayleigh Fading
BER
Figure 5. Diagram of BER Calculation Using Monte Carlo Simulation
. III.
RESULTS AND ANALYSIS A.
Testing BER Bit Error Rate Performance
1. BPSK Modulation
The graph in the figure below shows the ratio of BPSK modulation when it is passed only through the course
AWGN channel, rayleigh fading channel alone and the combination of both channels. For BPSK modulation are
passed through AWGN channel and rayleigh fading BER values are joined its worst among the two other tests.
Figure 6. BER in BPSK modulation
2. Modulasi QPSK
The picture below shows a comparison of chart testing QPSK modulation when passed only through the AWGN
channel only, rayleigh fading channel alone and the combination of both channels. For QPSK modulation BER
values are passed through AWGN channel and rayleigh fading is incorporated worst among the two earlier tests in
this test because its BER value at least as impaired as the SNR value addition.
Figure 7. BER at QPSK modulation
B. Performance Comparison of BPSK and QPSK
modulation system
1. Modulation BPSK and QPSK AWGN channel passes
From the graph BER test results on BPSK and QPSK modulation that are passed through AWGN channel in the
picture below, shows that the value of the BER on QPSK and BPSK modulation is affected by the increasing value of
the SNR where the SNR value will decrease the value of BER. Graph BPSK modulation over AWGN channel is
under QPSK modulation of the graph through the AWGN channel, it indicates that the BPSK modulation BER on
AWGN channel passing has better performance than the BER on QPSK modulation which is passed through an
AWGN channel.
Figure 8. BER of BPSK and QPSK modulation over rayleigh fading channels
2. Modulation BPSK and QPSK pass Rayleigh Fading
channel From the graph BER test results on BPSK and QPSK
modulation are passed through rayleigh fading channel in the picture below shows that the value of the BER on QPSK
and BPSK modulation is affected by the increasing value of the SNR where the SNR value will decrease the value of
BER. Graph BPSK modulation through rayleigh fading channel is under the QPSK modulation of the graph through
rayleigh fading channel, it indicates that modulation BER
Electronics and Telecommunications ICRAMET 2014
Batam – Indonesia | 7 – 8 May 2014
ICRAMET
120 value at BPSK in rayleigh fading channel passing has better
performance than the BER on QPSK modulation is passed through
rayleigh fading
channel.
Figure 9. BER of BPSK and QPSK modulation over rayleigh fading channels
3. Modulation BPSK and QPSK pass AWGN channel and
Rayleigh Fading combined From the graph in fiture below, the test results show that
the value of the BER on QPSK and BPSK modulation is affected by the increasing value of the SNR where the SNR
value will decrease the value of BER. However, from the results of testing the value of modulation BER parameter on
BPSK better than the results of the BER on QPSK modulation. This can be seen from the graph that BPSK
modulation over AWGN channel and rayleigh fading is incorporated in the bottom of the chart QPSK modulation
through
AWGN channel
and rayleigh
fading.
Figure 10. BER of BPSK and QPSK modulation over AWGN channel and rayleigh fading joined
IV. CONCLUSION
1. BER value of simulation and theoretical BER values did
not experience a significant difference. In some SNR values with the same simulated BER values, it has even
better than the BER value theory. It is because the bits or symbols which raised the software code using a random
system so in simulating BER results will not always be the same.
2. At BPSK modulation that is passed through AWGN
channel and rayleigh fading, which is its BER values is joined, it has the worst value among the tests.
3. At QPSK modulation when it is passed through an AWGN
channel, it will decrease the highest value along with the rising value of SNR compared with QPSK modulation
tests that are passed through rayleigh fading channel only, comparing to signal that is passed through an joined.
REFERENCES
1. Stallings, William.2007. “Komunikasi Jaringan Nirkabel jilid 2”.
Erlangga. Jakarta. 2.
Prabawati, A.F. 2012. “
Simulasi Modulasi Berbasis PSK Dan Qam Pada Kanal Rayleigh Fading Menggunakan Matlab
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3. Kurniawan, Adi. 2011. “
Simulasi Modulasi Digital Menggunakan Matlab
”. Laporan penelitian. Purwokerto : Akademi Teknik Telekomunikasi Sandhy Putra.
4. Surya, Putu. “
teknik Modulasi Digital Linear
”. Makalah Penelitian. Mataram. Nusa Tenggara Barat
5. Roden, Martin S. 1991. “
Analog and Digital Communication System
”. Pretince Hall. New Jersey.
6. Winch, Robert G. 1993. “
Telecommunication Transmission System
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7. Sklar, Bernard. Tahun. “
Digital Communication Fundamental and Application
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Harada, hiroshi Ramjee Prasad. 1997. “
Simulation and Software Radio for Mobile Communication
”. Genista Co. Ltd. Delft University of Technology.
9. Gumilang, Indra Wijaya.
“Estimasi Kanal Menggun
akan Least Square Estimation LSE Sistem Orthogonal Frequency Division Multiplexing
OFDM”. Skripsi. Jakarta : Universitas Indonesia.
DISCUSSION 1. Mashury Wahab
Q: What is the purpose of the simulation? Just seeing the performance or achieving better efficiency? I think we cant
use BER in the real application. A: This paper is only a lab scale. It is not used anymore in
mobile, but it can be used in other technology. My concern is that this technology can be applied in other uses.
