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" Cooperative communication has gain much attention recently. In this talk, we will first briefly introduce the work done by Prof. Ray Liu and his colleagues. In their work, a cooperative communication system with three nodes is discussed. Start from their work, we will introduce what the cooperative communication system is and what the rationale is behind it. Then we will discuss the SNR behavior of cooperative communication systems when adaptive modulation scheme is adopted under different combing mechanism. From results we obtain, equal gain combining has similar rate performance to that of maximal ratio combining when adaptive modulation scheme is adopted. Also we compare the SNR performance and rate performance between cooperative communication systems and multiple-input and single-output systems. Though MISO systems outperform cooperative communication systems, the cost of MISO in terms of hardware implementation and power consumption of a single device is much higher than cooperative communication systems. This again justifies the use of cooperative communication systems."