On-off Switched Interference Alignment for Diversity Multiplexing Tradeoff Improvement in the 2-User X-Network With Two Antennas

Abstract

To improve diversity gain in an interference channel and hence to maximize diversity multiplexing tradeoff (DMT), we propose on-off switched interference alignment (IA) where IA is intermittently utilized by switching IA on/off. For on-off switching, either IA with symbol extension or IA with Alamouti coding is adopted in this paper. Deriving and analyzing DMT of the proposed schemes, we reveal that the intermittent utilization of IA with simultaneous non-unique decoding can improve DMT in the 2-user X-channel with two antennas. Both the proposed schemes are shown to achieve diversity gain of 4 and DoF per user of 4 3 . In particular, the on-off switched IA with Alamouti coding, to the best of our knowledge, surpasses any other existing schemes for the 2-user X-channel with two antennas and nearly approaches the ideal DMT.

Addressing spectrum efficiency through hybrid-duplex UAV communications: Challenges and opportunities

“…It is noted that the JD approach, i.e., SND strategy, has been investigated for potential applications in practical wireless systems. For instance, a 2-user multiple input multiple output (MIMO) system was proposed in [107] that combines transmissions using interference alignment, i.e., beamforming, with receivers that adopt JD. For UAV communications, the feasibility of JD was studied in [15].…”

“…For instance, the application of DMT analysis in the literature, i.e., diversity gain at asymptotic SNR regimes, has mainly focused on cellular systems employing SIC [97], [98]. Likewise, the analysis in [107] focused mainly on DMT analysis for the II and the JD approaches.…”

Enhancing spectrum efficiency through hybrid-duplex systems for aeronautical communications

“…It is noted that the JD approach, i.e., SND strategy, has been investigated for potential applications in practical wireless systems. For instance, a 2-user multiple input multiple output (MIMO) system was proposed in [96] that combines transmissions using interference alignment, i.e., beamforming, with receivers that adopt JD. For UAV communications, the feasibility of JD was studied in [18].…”

“…For instance, only the application of DMT analysis, i.e., diversity gain at asymptotic SNR regimes, for cellular systems was studied in [22,85], where the SIC approach was considered. Likewise, in [96] where the II and the JD approach was considered, the authors focused only on DMT analysis.…”