Abstract:

Cooperative communication technology can exploit spatial diversity to improve system performance. In the case that the channel state information is known at the source node, a larger power gain can be obtained. A new scheme of adaptive modulation for a cooperative system was presented. This scheme utilized spacetime coding, a power allocation algorithm and relay selection technique, which significantly improved the system throughput with a certain bit error rate requirement. The performance of the proposed scheme was compared with the other existing adaptive and non-adaptive schemes. The results showed that the proposed adaptive modulation scheme had superior average throughput performance and could stably satisfy the bit error rate constraint.
 

Key words: cooperative communication, adaptive modulation, throughput