Enhancement of diversity using joitn Space-Time Block Codes for four transmit antennas

Wireless communication systems must be designed to mitigate fading to guarantee a reliable communication. In future technologies, a successful method to improve reliable communication over a wireless link is to use multiple antennas. Recently, a lot of effort has been put into designing closed-loop STBCs schemes with a full rate, full diversity and some array gain for four transmit antennas with one or two bit feed back in the case of two complex symbols transmission, respectively. In this paper, we propose a new enhancement of diversity using joint space-time block codes for four transmit antennas with one bit feedback. We show that the proposed scheme can achieve a full diversity, full rate and some array gain with simple linear decoding, and it has the same performance compare to EO-STBCs for four transmit antennas with two complex transmit symbols .