Abstract
In this article, we study relay selection and resource allocation in a cooperative network that employs Single Carrier - Frequency Division Multiple Access (SC-FDMA) in the uplink direction such as in Long Term Evolution - Advanced (LTE-A) system. With SC-FDMA, the frequency resources assigned to a transmitter should be adjacent to each other in the frequency domain (adjacency constraint). We formulate the total data rate maximization problem as a non-linear combinatorial optimization problem. Through algebraic manipulations, we managed to convert the original problem in a Mixed Integer Linear Problem (MILP) that can be optimally solved by standard computational solvers. So as to reduce the computational complexity, we propose a low-complexity suboptimal solution to this problem. Additionally, we propose a transmit power adjustment in order to reduce the power consumption in the system and improve Energy Efficiency (EE) by exploiting the characteristics of the forwarding mechanism in the relays. Finally, we present simulation results so as to evaluate the performance of the proposed solutions and obtain insights on the effect of the main variables presented in the system model.
Highlights
Mobile communication systems are continually evolving driven by the strong demand for new multimedia services, higher data rates, and increased system capacity in terms of the number of subscribers
In this article we study Resource Allocation (RRA) by means of relay selection and frequency resource assignment for cooperative networks that employs Single Carrier - Frequency Division Multiple Access (SC-FDMA) scheme
We model the adjacency constraint through the binary matrix, A, with dimensions N ×P consisting of the elements an,p with n ∈ N and p ∈ P, which assume the value 1 if Resource Block (RB) n belongs to the assignment pattern p, and 0 otherwise
Summary
Mobile communication systems are continually evolving driven by the strong demand for new multimedia services, higher data rates, and increased system capacity in terms of the number of subscribers. SC-FDMA scheme imposes adjacency constraint on resource allocation which requires that subcarrier blocks allocated to a transmitter must be adjacent or contiguous in the frequency domain. This new constraint significantly reduces the freedom in Radio Resource Allocation (RRA) compared to the OFDMA case where this constraint does not exist. In this article we study RRA by means of relay selection and frequency resource assignment for cooperative networks that employs SC-FDMA scheme. The computational complexity of the involved algorithms is calculated in the appendix of this article
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