Kinerja Teknik Transmisi OFDM melalui Kanal HAPS (High Altitude Platform Station)
ABSTRACT: Provision of
broadband communications services in High Altitude Platform Station (HAPS) is a
new idea and worthy to be discussed. One is the application of OFDM
transmission technique as a medium for digital modulation in HAPS. HAPS is a
new technology in the telecommunications sector at an altitude of 18-50 km (the
stratosphere) and used to serve the broadband wireless access (BWA) and other
multimedia devices. HAPS technology has advantages that can cover the lack of
terrestrial and satellite technology. Performance of OFDM transmission
technique in which a HAPS channel Rician channel can be evaluated by looking at
the effect of K-factor. K-factor is the dominant signal power ratio (Line Of
Sight) with multipath signal power. In real conditions on the ground, the
received power is a combination of the dominant signal power and multipath
signal power. The increase in elevation angle between the HAPS platform with
user terminals resulted in the increasing value of K-factor and the influence
that affected the performance of OFDM systems multipath fading. Effect of
K-factor can be identified by computer simulation. Effect of K-factor observed
by looking at the value of Bit Error Rate (BER) on the system to the value of
signal to noise ratio (SNR) by varying the bitrate and frequency doppler. The
results showed that the increasing value of K-factor at the same bitrate the
smaller the resulting BER. This shows the better performance of OFDM systems.
Meanwhile, the OFDM system performance deteriorated over increasing Doppler
frequency. This is because the increasing value of K-factor at the same Doppler
frequency resulting more BER value.
Penulis: AFRIANDI FERDINAN,
IMAM SANTOSO, DARJAT
Kode Jurnal: jptlisetrodd090107
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