Power-Throughput Tradeoff in MIMO Heterogeneous Networks

• Published in: IEEE transactions on wireless communications Vol. 13; no. 8; pp. 4309 - 4322
• Main Authors: Shashika Manosha, K. B., Codreanu, Marian, Rajatheva, Nandana, Latva-aho, Matti
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Base stations; Heuristic; Interference; Macrocell networks; Maximization; Maximum power; MIMO; Minimization; Networks; Optimization; Thresholds; Vectors; Wireless communication; heterogeneous networks; multi-input multi-output (MIMO); convex-hull; scalarization method; Achievable power¿rate values; interference threshold
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2014.2319076

We consider a single-macrocell heterogeneous multiple-input multiple-output network, where the macrocell shares the same frequency band with the femto network. The interference power to the macro users from the femto base stations is kept below a threshold to guarantee that the performance of the macro users does not degrade due to the femto network. We consider the problem of finding the set of all achievable power-rate tuples for this setting. We first formulate a two-dimensional vector optimization problem in which we consider maximizing the sum-rate and minimizing the sum-power, subject to maximum power and interference threshold constraints. The considered problem is NP-hard. We provide a method to solve the problem by using the relationship between the weighted sum-rate maximization and weighted-sum-mean-squared-error minimization problems. Furthermore, using the proposed algorithm, we evaluate the impact of imposing interference threshold constraints and the impact of co-channel deployment in heterogeneous networks. The proposed algorithm can be used to evaluate the performance of real heterogeneous networks via off-line numerical simulations.