Since spectral resources are limited, Current systems needs for the spectrally efficient transmission schemes as communication services increase. Various spectrally efficient schemes have been proposed. Among previous schemes, adaptive coded modulation is one of the appropriate schemes for current wireless data transmission because it can achieve the spectral efficiency as well as the power efficiency using coding gain and adaptive control for fading channel. However, the control policy optimized for uncoded system is applied to the conventional system with adaptive coded modulation. It is not optimal for coded system. In this thesis we propose an improved control scheme which is optimized for coded system. We derive suitable control policy for coded system, and then its performance is evaluated in terms of the required power and spectral efficiency to maintain the predetermined BER. The proposed control scheme fully utilizes coding gain, so it can maximize average spectral efficiency without any restriction on modulation type. The numerical results show the proposed adaptive coded modulation is more spectrally efficient satisfying required BER performance.
The proposed scheme maximizes average spectral efficiency and optimizes power allocation for coded system. So, it can be used for high speed data transmission in wireless channel.
