Enhancement of pairwise error probability performance in MIMO-OFDMA system using one-third ICI-SC subcarrier mapping technique with STFBC

Orthogonal frequency division multiple access (OFDMA) is broadly used in wireless communication system such as Mobile WiMAX and LTE. It is simply because of efficient usage of bandwidth, simple receiver and multiuser diversity. However, its major drawback is vulnerability to frequency offset (FO) which can wipe out the orthogonality of the subcarriers. This will lead to inter-carrier interference (ICI) that will deteriorate the system performance. In order to solve this issue, one-third subcarrier mapping scheme techniques with ICI self-cancellation (ICI-SC) method using data allocation in space-time-frequency block codes (STFBC) in MIMO-OFDMA system is proposed. The proposed technique is evaluated through Pairwise Error Probability (PEP) and Bit Error Rate (BER) performances. From the simulation results, one-third ICI-SC subcarrier mapping scheme with STFBC shows the best result for the MIMO-OFDMA system.