Distributed linear precoder optimization and base station selection for an uplink heterogeneous network

Mingyi Hong, Zhi-Quan Luo

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

In a heterogeneous wireless cellular network, each user may be covered by multiple access points such as macro/pico/relay/femto base stations (BS). An effective approach to maximize the sum utility (e.g., system throughput) in such a network is to jointly optimize users' linear procoders as well as their BS associations. In this paper, we first show that this joint optimization problem is NP-hard and thus is difficult to solve to global optimality. To find a locally optimal solution, we formulate the problem as a noncooperative game in which the users and the BSs both act as players. We introduce a set of new utility functions for the players and show that every Nash equilibrium (NE) of the resulting game is a stationary solution of the original sum utility maximization problem. Moreover, we develop a best-response type algorithm that allows the players to distributedly reach a NE of the game. Simulation results show that the proposed distributed algorithm can effectively relieve local BS congestion and simultaneously achieve high throughput and load balancing in a heterogeneous network.

Original languageEnglish (US)
Article number6477158
Pages (from-to)3214-3228
Number of pages15
JournalIEEE Transactions on Signal Processing
Volume61
Issue number12
DOIs
StatePublished - Jun 3 2013

Keywords

  • Base station selection
  • Nash equilibrium
  • heterogeneous networks
  • noncooperative gams
  • precoder optimization

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