Orthogonal Stbcs for Five, Six and Seven Transmit Antennas

Alamouti proposed orthogonal STBCS for two transmit antennas with code rate one. Tarkoh investigated for three to eight transmit antennas with code rate 1/2. Jafarkhni proposed for non orthogonal STBCS four transmit antennas with code rate one. The theory of space-time block codes was further developed by Weifen Su and Xian-Gen Xia. They defined space time block codes in terms of orthogonal code matrices. The properties of these matrices ensure code rate of 7/11 and 3/5 for 5 and 6 transmit antennas. For five, six, seven and eight transmit antennas, four generalized complex orthogonal space-time block codes of code rate with 2/3, 2/3,5/8, and 5/8 proposed recently . This paper intends new matrix GCOD Space time block codes for five, six, seven transmit antennas which can send 8 information symbols in a block of 8 channels with code rate of 1.