2016/05/27 by Young-Sik Moon, Jae-Hong Kim, Moon, Young-Sik +7
Computer Science · Mathematics · #FOS: Computer and information sciences #Information Theory (cs.IT) #cs.IT #math.IT
paper · pdf · doi:10.48550/arxiv.1605.08552
arxiv created 2016/05/27 · arxiv updated 2016/05/30
In this paper, degrees of freedom (DoF) is investigated for the M× N single input single output (SISO) X channel with alternating channel state information at the transmitters (CSIT). It is known that the sum DoF of 2-user SISO X channel with synergistic alternating CSIT is the same as the sum DoF of 2-user (M=N=2) SISO X channel with perfect CSIT [8]. In this paper, such 2-user X channel schemes are extended to the general M× N X channel. It is shown that the proposed M× N X channel schemes with synergistic alternating CSIT achieve 2M/(M+1) sum DoF. This DoF with M=N=K is strictly lager than the best known DoF for the K-user X channel with delayed CSIT.