2016/05/13 by Milad Johnny, Johnny, Milad, Mohammad Reza Aref +1
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Communication Security Techniques
paper · pdf · doi:10.48550/arxiv.1605.04042
openalex publication_date 2016/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In this paper, we consider the problem of the interference alignment for the K-user SISO interference channel (IC) with blind channel state information (CSI) at transmitters. Our achievement in contrast to the traditional K-user interference alignment (IA) scheme has more practical notions. In this case, every receiver is equipped with one reconfigurable antenna which tries to place its desired signal in a subspace which is linearly independent of interference signals. We show that if the channel values are known to the receivers only, the sum degrees-of-freedom (DoF) of the linear blind IA (BIA) with reconfigurable antenna is (Kr)/(r2-r+K), where r = \lceil(√(1+4K)-1)/(2) \rceil. The result indicates that the optimum sum DoF for the K-user IC is to achieve the sum DoF of limK → ∞ (Kr)/(r2-r+K)=(√(K))/(2) for an asymptotically large interference network. Thus, the DoF of the K-user IC using reconfigurable antenna grows sublinearly with the number of the users, whereas it grows linearly in the case where transmitters access to the CSI. In addition, we propose both achievability and converse proof so as to show that this is the sum DoF of linear BIA with the reconfigurable antenna.