Performance Analysis of Cross Layer Adaptation of Modulation and Coding in Slow, Flat Fading Channels

The end-to-end Quality of Service (QoS) is getting more and more importance nowadays. QoS is composed of many parameters, like bit error rate (BER) delay, jitter etc. This paper will make the mathematical analysis of the spectral efficiency of adaptive modulation and coding (AMC) which - unlike conventional adaptive modulation and coding - takes into consideration the bit error requirements of different service classes, beside the instantaneous channel conditions. The paper will provide results on average spectral efficiency, mode selection probabilities and average bit error rate performance of proposed and conventional adaptive modulation (AM) in multiplicative, slow Rayleigh fading channel. The fading is assumed to be slow enough, that the adaptive modulation can adapt to the variable channel state.