A low detection complexity of multiple antenna two-way collaboration communication transmission scheme

MIMO systems transmit signals by multiple antennas at the terminals, thus, to get spatial diversity gain and improve system capacity dramatically. Compared with single MIMO systems, the distributed MIMO system has higher coverage and larger capacity. MIMO systems using the joint coding technique through the full diversity of the space-time code can not only obtain the full diversity gain, but also improve spectrum efficiency effectively. But the detection complexity is high at the receiving terminal and information interference exists when transferring between antennas. Space-time coding can reduce the information interference between antennas and obtain diversity gain without sacrificing the bandwidth. The cyclic delay methods can effectively reduce the detection complexity. We present a high rate of distributed cooperative MIMO transmission scheme combining with space-time coding technique and cyclic delay technology. The transmitting terminal sends message to the relay nodes. Meanwhile, the source through the direct channel broadcasts information to all terminals. After the space-time coding, the received information at relay nodes is sent to the transmitters using cyclic delay method and amplifying forwarding (AF) method. This program applies to scene of both the communication source node and relay nodes all configured with multiple antennas. And the simulation results show that this two-way scheme we proposed can significantly improve the diversity gain and the total transmission rate, and enlarge the coverage of wireless network.