Cooperative Transmission Scheme to Increase Gain by Using STBC
Ho-Jung An, Jee‐Hoon Kim, Hyoung‐Kyu Song · 2007
Abstract — Multiple-Input Multiple-Output (MIMO) systems are composed of source and destination nodes with multiple antennas. But, when nodes cannot support multiple antennas due to size or other constraints, especially for mobiles, the MIMO cannot be used to provide diversity. Cooperative communication enables single antenna to realize a virtual multiple antenna transmitter by sharing their antennas. Therefore, it offers transmit diversity. To achieve high-performance by using Space-Time Block Codes (STBC), we apply pre-coding scheme to the transmit symbols. Even though pre-coding scheme has several shortcomings, it is possible to employ STBC with one transmit antenna, thereby it can achieve high gain, without loss of transmission rate. Simulation results reveal that it is possible to obtain higher error performance at the low SNR by using proposed scheme. Index Terms — Pre-coding, STBC, Amplify-and-Forward, transmit diversity, CSI. I.