Channel Equalisation at the transmitter refers to pre-distorting the input signal so that the effect of the channel is nullified during transmission. In any communication system, the emphasis is on estimating the channel response so as to retrieve the transmitted input signal accurately at the receiver’s end. Orthogonal frequency division multiplexing (OFDM) is an efficient multi-carrier modulation technique which can be combined with transmitter and receiver diversity communication systems. For these systems, channel estimation and tracking must be performed since the receiver requires channel state information for decoding. In this thesis, we have compared the 4QAM, 16QAM and 32QAM using the BER Values. Simulation results show that the Bit Error Rate (BER) performance of the system is identical with that of the effect of noise, when this technique is implemented for basic modulation schemes. Whereas, when the technique is implemented for Multiple Input Multiple Output (MIMO) system, or a Multiple Input Multiple Output (MIMO) system with Orthogonal Frequency Division Multiplexing (OFDM) modulation, it shows a better Bit Error Rate (BER) performance than that of the usual way of channel equalization in the respective systems.
Multiple Input Multiple Output (MIMO), Bit Error Rate (BER)