Abstract
The multiple-input-multiple-output (MIMO) concept and orthogonal frequency division multiple access (OFDMA) combination has been perceived as the most auspicious system to attain high transmission data rate and mitigate inter-symbol interference (ISI). However, high peak-to-average power ratio (PAPR) in OFDMA causes non-linearity at the receiving end of the system. Thus, single carrier frequency division multiple access (SCFDMA) technology is used to compensate this issue. This study evaluates the performance of both OFDMA and SCFDMA system based on the bit error rate (BER) and PAPR values. A comparison of space-time (ST), space-frequency (SF), and space-time-frequency (STF) block coding has been conducted for both systems to achieve better system performance. The best diversity scheme to implement in OFDMA and SCFDMA system in order to minimize PAPR and BER were investigated. From the analysis, the space-time-frequency block coding (STFBC) shows better performance in both MIMO SCFDMA systems. The result obtained that the SCFDMA system can improve the performance of BER and PAPR about 42% and 47% with diversity technique.
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