Author Details

This paper presents the strategy of applying Hybrid adaption techniques in MIMO OFDM system. With the rapid growth of digital communication in recent years, the need for high-speed data transmission is increased. Multiple-input-multiple-output (MIMO) antenna architecture has the ability to increase capacity and reliability of a wireless communication system. Orthogonal frequency division multiplexing (OFDM) is another popular technique in wireless communication which is famous for the efficient high speed transmission and robustness to frequency selective channels. Therefore, the integration of the two technologies probably has the potential to meet the ever growing demands of future communication systems. First focusing on OFDM in which the bit error rate (BER) of multilevel quadrature amplitude modulation (M-QAM) in flat Rayleigh fading channel for 128,256,512 subcarriers was calculated and also channel estimation can be done by using different algorithms which is carried out through Matlab software. The channel estimation of MIMO OFDM system is calculated by using Minimum mean square error algorithm (MMSE) and compares the actual value and estimation errors using Matlab simulation. Then take the feedback from the channel estimation and apply hybrid adaptation techniques to improve the spectral efficiency and to reduce the transmit power. This system is used in wireless LAN i.e. IEEE 802.11a/g, HYPERLAN etc.

Keywords

MIMO, OFDM, BER, M-QAM, MMSE, MIMO OFDM

Full Text

Username
Password
Remember me