Eureka! Institutional Repository

This thesis presents the study of a a multiple antennas (multi-input and multi-output – MIMO) scheme with orthogonal frequency division multiplexing in combination with M-ary frequency shift keying (MIMO OFDM-MFSK) [1] and non-coherent detection in a white noise (AWGN) and Rayleigh fading channel. MATLAB was used in order to simulate and calculate the Bit Error Rate (BER) of the system for various Signal-to-Noise ratio and different M values of FSK modulation. This scheme is considered to be a useful system for next generation of mobile communications (5G), especially for low complexity receiver applications such as the ones involved inthe Internet of Things. This particular modulation system is extremely resistant at fast fading channels and and the special feature that is analyzed is the non-coherent detection capability that leads to low complexity and low power consumption receivers. In this context, a detailed analysis of the OFDM-MFSK symbols construction is given together with a the Space-Time-Frequency (STF) coding techinque, which is applied in order to use the MIMO channel effectively. In addition, a low density parity check (LDPC) coding schme of the information bits is used for BER enhancemment. The results show that the proposed scheme has very good performance under the specific channels that are studied and prove that it is a significant alternative solution for wireless application that do not require high spectral efficiency.