Dynamic User Grouping and Joint Resource Allocation With Multi-Cell Cooperation for Uplink Virtual MIMO Systems

Abstract

Abstract-This paper proposes a novel joint resource allocation algorithm combining dynamic user grouping, multi-cell cooperation and resource block (RB) allocation for single carrierfrequency division multiple access (SC-FDMA) uplink in multicell virtual MIMO systems. We first develop the dynamic multicell user grouping criteria using minimum mean square error (MMSE) equalization and adaptive modulation (AM) with bit error rate (BER) constraint. Then, we formulate and solve a new throughput maximization problem whose resource allocation includes cell selection, dynamic user grouping and RB pattern assignment. Furthermore, to reduce the computational complexity significantly, especially in the case of large numbers of users and RBs, we present an efficient iterative Hungarian algorithm based on user and resource partitions (IHA URP) to solve the problem by decomposing the large scale problem into a series of small scale sub-problems, which can obtain close-to-optimal solution with much lower complexity. The simulation results show that our proposed joint resource allocation algorithm with dynamic multicell user grouping scheme achieves better system throughput with BER guarantee than fixed user grouping algorithm and other proposed schemes in the literature.

Resource Virtualization for Customized Delay- Bounded QoS Provisioning in Uplink VMIMO-SC-FDMA Systems

“…VMIMO, also called multiuser MIMO, refers to a communication system where a BS with multiple antennas serves two or more single antenna users on the same frequency band and time slot. Compared with the conventional MIMO system, VMIMO can obtain additional multiuser diversity gain by grouping users using well-designed strategies [24]- [26].…”

“…In order to obtain both multiuser diversity gain and frequency selective gain, VMIMO is usually applied to uplink SC-FDMA systems [24]- [26]. In [24] and [25], joint resource allocation algorithms are proposed for uplink VMIMO-SC-FDMA systems with fixed 2-user pairing.…”

“…In [24] and [25], joint resource allocation algorithms are proposed for uplink VMIMO-SC-FDMA systems with fixed 2-user pairing. In [26], dynamic user grouping and joint resource allocation algorithm is proposed for multi-cell uplink VMIMO-SC-FDMA systems.…”

“…where σ 2 denotes the spectral density power of noise. Then, we get the post-processing SINR of user-u after MIMO equalization as [26]…”

“…The specific equation can be designed as follows: Then, according to the Eq. 3, the capacity in the l-th frame slot using post-processing SNR can be expressed as [26]…”