MSE minimized joint transmission in coordinated multipoint systems with sparse feedback and constrained backhaul requirements
Journal article, 2021

In a joint transmission coordinated multipoint (JT-CoMP) system, a shared spectrum is utilized by all neighbor cells. In the downlink, a group of base stations (BSs) coordinately transmit the users’ data to avoid serious interference at the users in the boundary of the cells, thus substantially improving area fairness. However, this comes at the cost of high feedback and backhaul load; In a frequency division duplex system, all users at the cell boundaries have to collect and send feedback of the downlink channel state information (CSI). In centralized JT-CoMP, although with capabilities for perfect coordination, a central coordination node have to send the computed precoding weights and corresponding data to all cells which can overwhelm the backhaul resources. In this paper, we design a JT-CoMP scheme, by which the sum of the mean square error (MSE) at the boundary users is minimized, while feedback and backhaul loads are constrained and the load is balanced between BSs. Our design is based on the singular value decomposition of CSI matrix and optimization of a binary link selection matrix to provide sparse feedback—constrained backhaul link. For comparison, we adopt the previously presented schemes for feedback and backhaul reduction in the physical layer. Extensive numerical evaluations show that the proposed scheme can reduce the MSE with at least 25 % , compared to the adopted and existing schemes.

MSE minimization

Constrained backhaul

JT-CoMP

SVD decomposition

Sparse feedback

Author

Mohammad Bagher Nezafati

Institute for Research in Fundamental Sciences (IPM)

Mehrdad Taki

University of Qom

Tommy Svensson

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Eurasip Journal on Wireless Communications and Networking

1687-1472 (ISSN) 1687-1499 (eISSN)

Vol. 2021 1 103

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1186/s13638-021-01979-3

More information

Latest update

5/12/2021