Simplified SINR-Based User Pairing Scheduling for Virtual MIMO

Abstract

A user pairing method is proposed to improve the throughput and users' fairness performance in virtual multiple input multiple output (VMIMO) in 3rd Generation (3G) long-term evolution (LTE). This approach is based on post-processing signal to interference plus noise ratio (SINR) of each user, and takes both large scale and small scale fading into account, which renders more spatial multi-user diversity than that of the traditional paring criterions. To simplify the method, a parameter D is constructed from each user's raw SNR and channel matrix H. As shown in the simulation results, the average system transmission rate obtained by the proposed simplified SINR-based pairing scheduling (SSINR_PS) is obviously larger than that of traditional strategies such as random pairing scheduling (RPS), determinant pairing scheduling (DPS) and SINR-based pairing scheduling as the optimal one. Meanwhile, the fairness of the paired users is improved significantly.

Performance analysis of cooperative virtual multiple‐input–multiple‐output in small‐cell networks

“…According to (5) and (8) for SNR estimation, the addition and multiplication operations can be omitted in comparison with the operations for the multiplication and the inverse of the channel matrix in (8), which depends on the matrix dimension, i.e., O (K 2 N R ) and O (min (K, N R ) 3 ) respectively. For the exhaustive search shown in (20), the number of comparisons is determined by the number of users with a non-empty queue, i.e., N q .…”

“…In [6] and [7], the pairing algorithms based on the determinant of the equivalent channel matrix are studied, which only consider the orthogonality of the channels between users. Then, the signal-to-interference-plus-noise ratio (SINR)-based paring scheme is proposed [8], where two UEs with a small difference in SINR are more likely to be paired. However, these schemes ignore user fairness and are not optimal from the perspective of throughput maximization.…”

Research on user pairing algorithm for LTE femtocell uplink

“…One of the most important process of V-MIMO is user pairing, i.e., selecting the users to construct a V-MIMO system based on some criterion (e.g., selecting users from close-to-orthogonal spatial channels). Several user pairing strategies have been declared in [1][2][3][4][5][6], such as Random Pairing Scheduling (RPS), Determinant Pairing Scheduling (DPS), Capacity Pairing Scheduling (CPS), and doubly proportional fairness (D-PF). The exact pairing criterion depends on what the designer emphasizes: to optimize system throughput, fairness among the users, or trade-off between the two.…”