ABSTRACT
This research paper investigates the Ergodic capacity of MIMO-OFDM system in Rayleigh Fading Channel to increase the Ergodic Capacity of the system. Orthogonal Frequency Division Multiplexing (OFDM) is multicarrier modulation technique for transmission of signals over wireless channel. OFDM, using multiple sub carriers divides the available spectrum into number of sub orthogonal sub channels. Multiple input multiple outputs (MIMO) using multiple transmitting and receiving antennas for high data rate transmission with limited bandwidth are used. OFDM is combined with MIMO to increases the capacity of the system. MIMO-OFDM is popular technique for high data transmission because of usages of multiple carriers. One of the challenging problems of OFDM is Peak to Average Power Ratio (PAPR). In this it has been attempted to minimize the value of PAPR so that Ergodic Capacity of the system increases. For Reducing the value of PAPR we have used Coding Technique Low Density Parity Check Coding (LDPC).Further analysis by using 64 QAM with LDPC, using this Quardature Amplitude Modulation Spectral Efficiency increases. For investigating the systems performance Matlab has been used, mostly focusing on four Parameters Ergodic capacities, Signal to Noise Ratio, Bit Error Rate, Number of Transmitting Antennas. This will allow future wireless system to have high data rates. By reducing the number of guard bands the spectral efficiency can be increased in future.
