Performance Analysis of 1⁄2 Code Rate Convolution Encoded Dwt-ofdm System with Different Modulation Schemes
نویسندگان
چکیده
DWT-OFDM has drawn most of the attention in the field of wireless communication. But to provide better efficiency of the communication channel, error correction codes are proposed. In this paper, we investigated the performance of 1⁄2 rate convolution encoded discrete wavelet transform based orthogonal frequency division multiplexing system (DWT-OFDM) over Additive White Gaussian noise channel (AWGN). Different orders of QAM and PSK modulations have been used for simulating the system in MATLAB environment. Bit error rate (BER) has been used as measuring parameter to evaluate the performance of proposed system. We have compared the performance of 1⁄2 rate convolution encoded DWT-OFDM system with conventional encoded system. It is shown in the results that convolution encoded system performs better than conventional encoded system under all the simulating conditions. Different modulation scheme namely 16-QAM, 32-QAM, 64-QAM, 16-PSK and 32-PSK have been implemented to modulate the encoded data bits. It has been found that convolution encoded DWT-OFDM system performs better with QAM modulation than PSK modulation. Further, performance of the system increases with decrease in the constellation number of modulation scheme.
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