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Interference alignment (IA) was shown effective for interference managementto improve transmission rate in terms of the degree of freedom (DoF) gain. Onthe other hand, orthogonal space-time block codes (STBCs) were widely used inpoint-to-point multi-antenna channels to enhance transmission reliability interms of the diversity gain. In this paper, we connect these two ideas, i.e.,IA and space-time block coding, to improve the designs of alignment precodersfor multi-user networks. Specifically, we consider the use of Alamouti codesfor IA because of its rate-one transmission and achievability of full diversityin point-to-point systems. The Alamouti codes protect the desired link byintroducing orthogonality between the two symbols in one Alamouti codeword, andcreate alignment at the interfering receiver. We show that the proposedalignment methods can maintain the maximum DoF gain and improve the ergodicmutual information in the long-term regime, while increasing the diversity gainto 2 in the short-term regime. The presented examples of interference networkshave two antennas at each node and include the two-user X channel, theinterferring multi-access channel (IMAC), and the interferring broadcastchannel (IBC).

Maximum-rate Transmission with Improved Diversity Gain for Interference Networks