MIMO OFDMA receiver optimization using APA adaptive filter based in MMSE-DFE equalizer with diversity techniques

摘要

The mishmash of multiple-input-multiple-output (MIMO) and orthogonal frequency division multiple access (OFDMA) innovation has been perceived as one of 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. To solve this problem, Affine Projection Algorithm (APA) based filter in minimum mean square error-decision feedback equalizer MMSE-DFE is proposed with different diversity techniques. This study evaluates the performance of OFDMA system based on the bit error rate 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 system in order to minimize PAPR was investigated. From the analysis, the space-time-frequency block coding (STFBC) shows better performance in both MIMO OFDMA systems. The result obtained that the OFDMA system can improve the performance of PAPR about 47% with full diversity technique.