• Shubham Tyagi
• Rajesh Kumar

Orthogonal Frequency Division Multiplexing (OFDM) is come up and auspicious technique for future wireless system for high data rate wireless communication systems over frequency selective channels. Although, OFDM-based systems are sensitive to the inter-carrier interference (ICI) generated by a carrier frequency offset (CFO), it degrades the error probability performance for both single-antenna OFDM systems. Moreover, in a multipath fading environment, performances of OFDM system in a wireless channel are severely degraded by random variations in the amplitude of the received signals as well as by the presence of inter-symbol interference (ISI) and inter-carrier-interference (ICI) which also limit the OFDM system performance. Recently, Alamouti STBC has gained much attention as an effective transmit diversity scheme to provide reliable transmission with high peak data rates to increase the capacity of wireless communication system. In this research work, an advanced method for STBC-OFDM is proposed. The advancements are done with existing method in remapping of complex data after STBC encoding and serial to parallel conversion of complex data. This mitigation actually doubles the length of the data. At the receiver end, again demapping of data is done which halfs the data length. This procedure helps in reduction of chances of error in the signal. The main objective of the proposed method is to reduce the BER and SER in the STBC-OFDM system. For each simulation, blocks of 1024 symbols are simulated. The proposed system is simulated with two transmitter antennas, two receiver antennas.

"PERFORMANCE EVALUATION OF OFDM WIRELESS COMMUNICATION SYSTEM BASED ON ADVANCED STBC", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.297-304, September-2018, Available :http://www.jetir.org/papers/JETIR1809193.pdf

"PERFORMANCE EVALUATION OF OFDM WIRELESS COMMUNICATION SYSTEM BASED ON ADVANCED STBC", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp297-304, September-2018, Available at : http://www.jetir.org/papers/JETIR1809193.pdf