Combining interference alignment and Alamouti codes for quasi-static MIMO X channel

In this paper, a new combining scheme of interference alignment and Alamouti codes is proposed for the quasistatic MIMO K × 2 X channel. In fact, a brilliant scheme was already proposed in [1] for 2×2 MIMO X channel. However, it is difficult to extend for more general case. Therefore, for K × 2 MIMO X channel, a simple transmission and decoding schemes is proposed in this paper. The transmission scheme is based on the interference alignment concept and Alamouti-code and the decoding scheme exploits the zero-forcing and decoupling method of two Alamouti-codes.