Review of Various Adaptive Modulation and Coding Techniques in Wireless Network

Adaptive modulation and coding (AMC) is a method which adapts its transmitting parameters according to the channel state and is used in various modern wireless communications to maximize spectrum efficiency by minimizing the error rate. One of the driving strengths of AMC is the Signal-to-Noise Ratio (SNR) estimation and feedback channel for adaptation. Degrading effects caused due to sudden variation in the channel over time sometimes require the transmission link to react appropriately so it can minimize the Bit Error Rate (BER). There are various adaptive methods to implement the same like variable rate, variable error probability, and variable coding or hybrid technique. This article focuses upon variable power technique and describes two to three different power techniques and tries to make a comparison between two of them i.e, channel inversion and water-filling. KeywordsAdaptive Modulation and Coding (AMC), Bit Error Rate (BER), channel inversion, water-filling ----------------------------------------------------------------------***--------------------------------------------------------------------