IOSR Journal of Engineering
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. It is adopted as a standard for HYPERLAN & IEEE 802.11. It offers considerable high data rate, high spectral efficiency, high power efficiency, multipath delay spread tolerance. It has a flexibility to adapt the modulation scheme on subcarriers according to the channel performance, i.e. Signal-to-Noise Ratio (SNR). In this paper, the authors analyze the Bit Error Rate (BER),Mean Square Error (MSE), Spectral Efficiency, Throughput performance of adaptive OFDM with BPSK,QPSK & QAM modulation over AWGN channel.