Institute of Electrical & Electronic Engineers
Consider a wireless network, in which multiple users exchange data with each other via a multi-antenna relay. The users transmit to the relay simultaneously. Then the relay regenerates the transmitted signal and pre-codes it before broadcasting to the users. In particular, the authors propose a Minimum Mean Square Error (MMSE) based pre-coder, which takes the relay detection errors into account. They indicate that this pre-coder can improve the bit error performance when uplink channel is in a bad condition. Afterwards, they deploy the ordered MMSE Successive Interference Cancellation (MMSE-SIC) receiver, which exploits temporal diversity gains over the multiple downlink slots. Simulation results show that the ordered MMSE-SIC receiver can achieve sufficient diversity gains over traditional MMSE receiver.