KINERJA AKSES JAMAK OFDM-CDMA
ABSTRACT: Problems in the
current telecommunications system is how to send data with a very high speed
but limited in the frequency allocation. One of the solution of this problems
that is used a OFDM (Orthogonal Frequency Division Multiplexing) system which
is a multicarrier communication scheme where the inter-frequency subcarriers
orthogonal to each other and overlapping each other so it can save the
frequency allocation. To serve more than one user, OFDM systems have combined
with a CDMA multiple access technique.
A simulation of the OFDM system created using Matlab by applying the CDMA
system for the multiple access technique in the OFDM system and known as
CDMA-OFDM. Combination of these two techniques will increase the speed of data
transmission and it can serve many users at one time. This final project aims
to determine the influence of the number of users in the system, the long PN
code, the number of subcarrier and the value of Eb/No CDMA-OFDM system in
Additive White Gaussian Noise (AWGN) transmission channel. The performance of
the system was known from the value of Bit Error Rate (BER) at receiver.
For PN code length variation 32, 64 and 128, the simulation CDMA-OFDM
system with 32 users showed that the longer PN code is used, the system will
show a better performance. It can be seen from the value of the BER system is
decreases. For PN code length 32, the
system will show the value of BER 0 in the level of Eb/No 9 dB. For PN code
length 64, the system will show the value of BER 0 in the level of Eb/No 7 dB
and for PN code length 128, the system will show the value of BER 0 in the
level of Eb/No 3 dB.
Penulis: SUKISWO, AJUB AJULIAN
ZAHRA
Kode Jurnal: jptlisetrodd090086
