An Approach to Maximize the Admitted Device-to-Device Pairs in MU-MIMO Cellular Networks

Author:

Wang Yubo1,Liu Fang2ORCID,Li Zhixin2,Chen Songchao2,Zhao Xu1ORCID

Affiliation:

1. Beijing Smart-Chip Microelectronics Technology Co., Ltd., Beijing 100192, China

2. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Abstract

Due to the shortage of wireless resources and the emergence of a large number of users, determining how to guarantee the quality-of-service (QoS) requirements of users and make more users work in the same spectrum has become an urgent research topic. In this paper, we study a multi-user MIMO (MU-MIMO) cellular network system model in which cellular users (CUs) share the same spectrum resource with multiple device-to-device (D2D) pairs. To maximize the number of admitted D2D pairs sharing the same spectrum with the CUs, a joint power allocation and channel gain (JPACG) algorithm is proposed. The optimization problem is divided into two steps to be solved. First, the power allocation of CUs without D2D pairs admitted is solved. Then, the optimization problem is transformed into minimizing the interference to CUs when CUs are treated as primary users. The admittance order of D2D pairs is determined by the transmission power and channel gain. The proposed algorithm uses a convex optimization algorithm to solve the problem of power allocation joint interference channel gain in order to maximize the number of admitted D2D pairs under the constraints of the signal-to-interference-plus-noise ratio (SINR) threshold and maximum transmission power. In addition, the effect of the number of admitted D2D pairs on the total sum rate of all users is also analyzed. The simulation results show that the proposed JPACG algorithm can achieve better performance in admitting D2D pairs.

Funder

Ministry of Industry and Information Technology of the People’s Republic of China

Publisher

MDPI AG

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