Performance of Cooperative Spatial Multiplexing SISO/MIMO Communication Systems with Constellation Rearrangement technique

Cooperative spatial multiplexing technique proposed to simplify the transmitting and receiving process on the relay nodes while providing significant energy savings. This paper investigates the performance of constellation rearrangement scheme when used in conjunction with cooperative spatial multiplexing MIMO/SISO relaying networks. During the MIMO relaying process, instead of having a single antenna for relay we have multiple antennas for relay by using additional information from MAC layer. The idea is to use the optimized constellation so that minimum squared Euclidean distance between different branches is maximized. Through extensive numerical search, we obtain the best constellation rearrangement scheme. Maximum likelihood detector is required in the receiver but the computational complexity of the receiver does not change because the proposed constellation will be saved in a table at the transmitter this search done by using arrival information from MAC layer.