Abstract:
The demand for high-speed mobile wireless communications is rapidly growing. OFDM
technology promises to be a key technique for achieving the high data capacity and spectral
efficiency requirements for wireless communication systems of the near future. Because of the
demand of higher transmission data rate and better transmission quality, the STBC-OFDM
technology is the trend of the next-generation WLANs and wireless communication. In this
thesis, we analyze the symbol error performance of a STBC-OFDM wireless communication
system. Analysis is also extended to include the effect of carrier frequency offset.
Theoretical analysis is carried out to evaluate the symbol error performance of STBC ---coded
wireless communication system. The performance is compared using Alamouti-STBC and
maximal-ratio receive combining scheme. The impact of carrier frequency offset on STBCcoded
OFDM systems is also analyzed for BPSK, QPSK and 16-QAM modulation. The
performances of STBC-OFDM system in Rayleigh a channels are evaluated with different
values of carrier frequency offset. The SER performance of a orthogonal STBC-OFDM with
carrier frequency offset with multiple transmitting and single receiving antennas are
analytically developed using Gaussian approximation method and Exact method by assuming
the ICI to be Gaussian and non-Gaussian. The performance of STBC-OFDM system with
carrier frequency offset is also compared with this two method.
The results show that the reliability of the wireless communication system increases as the
number of transmits and received antenna increase with the use of STBC coding even under
frequency offset.
The performance results of the system are evaluated by numerical computation and by
simulation using MATLAB. The improvement of the system performance due to STBC and
performance degradation due to carrier frequency offset is found.
