OPERATIONAL ASSESSMENT OF MULTI-TONE DIRECT SEQUENCE CDMA ON NAKAGAMI M-FADING CHANNEL
YUSSUFF Abayomi Isiaka O., FOLORUNSHO Hamed B.
ETRJ. Vol. 4(1), 20 March, 2019
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Abstract: Multi-tone direct sequence code division multiple access (MT-DS-CDMA) is a promising technique to support multiple users with secured high speed wireless communications as it capable to improve the system performance by mitigating multiple access interference (MAI). In this research work, operational assessment of MT-DS-CDMA using binary phase shift modulation (BPSK) scheme over Nakagami m-fading channel (a generalized distribution which can model different fading environments to study the impact of fading channels on wireless communications) considering channel impairments has been analyzed. An analytical approach for basic communication signal transmission using BPSK modulator was used to find the expressions of signal to interference plus noise ratio (SINR) as well as BER with maximal ratio combining (MRC) in the presence of multiple-access interference (MAI) and noise. The assessment was carried out through simulation on Matlab. The system performance was evaluated considering SINR and BER by varying number of multiple users, fading parameter and number of sub-carriers. The assessment was carried out to find the effect of carrier signals to MAI, noise, and active users in MT DS CDMA communication scheme. The results presented that increase in number of active users required increase in number of sub-carriers, increase in MAI, increase in BER and increase in signal power. Again, an increase in signal power resulted in increased SINR. Furthermore, an increase in signal power led to decreased BER. Hence, it was concluded that Signal power and SINR are key component for consideration to optimize performance of MT-DS-CDMA.
