2015/01/20 by Abhinav Ganesan, Ganesan, Abhinav, K. Pavan Srinath +1
Computer Science · Engineering · Mathematics · #Advanced MIMO Systems Optimization #FOS: Computer and information sciences #Information Theory (cs.IT) #Satellite Communication Systems #Wireless Body Area Networks #cs.IT #math.IT
paper · pdf · doi:10.48550/arxiv.1501.04775
Single Column, 32 pages, 4 figures; typos in the previous version fixed
openalex publication_date 2015/01/20 · arxiv created 2015/01/28 · arxiv updated 2015/01/29 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
The sum degrees of freedom (DoF) of the two-transmitter, two-receiver multiple-input multiple-output (MIMO) X-Network (2 × 2 MIMO X-Network) with M antennas at each node is known to be (4M)/(3). Transmission schemes which couple local channel-state-information-at-the-transmitter (CSIT) based precoding with space-time block coding to achieve the sum-DoF of this network are known specifically for M=2,4. These schemes have been proven to guarantee a diversity gain of M when a finite-sized input constellation is employed. In this paper, an explicit transmission scheme that achieves the (4M)/(3) sum-DoF of the 2 × 2 X-Network for arbitrary M is presented. The proposed scheme needs only local CSIT unlike the Jafar-Shamai scheme which requires the availability of global CSIT in order to achieve the (4M)/(3) sum-DoF. Further, it is shown analytically that the proposed scheme guarantees a diversity gain of M+1 when finite-sized input constellations are employed.