Title :
Investigation of Interference Margin for the Co-existence of Macrocell and Femtocell in Orthogonal Frequency Division Multiple Access Systems
Author :
Bin Han ; Wenbo Wang ; Yong Li ; Mugen Peng
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
Femtocells that share the same spectrum with macrocells can enhance wireless coverage and system capacity. However, cross-tier interference between femtocells and macrocells complicates the process of two-tier network planning. In the network planning, interference margin (IM) is a key parameter for the link budget to indicate the impact of interference and calculate the cell coverage. The conventional IM evaluation method for orthogonal frequency division multiple access (OFDMA) systems does not consider the cross-tier interference and is unavailable for the co-existence of macrocell and femtocell scenario. In this paper, a proper method to obtain macrocell uplink IM considering the cross-tier interference is presented, and the closed-form expression of IM is derived as a function of system load. The simulation results confirm that the proposal can calculate the macrocell uplink IM accurately in two-tier OFDMA networks.
Keywords :
OFDM modulation; femtocellular radio; frequency division multiple access; radiofrequency interference; telecommunication network planning; IM evaluation method; OFDMA systems; closed-form expression; cross-tier interference; femtocell coexistence; interference margin; link budget; macrocell coexistence; macrocell uplink IM; orthogonal frequency division multiple access systems; system capacity; two-tier OFDMA networks; two-tier network planning; wireless coverage; Fading; Integrated circuits; Interference; Macrocell networks; Signal to noise ratio; Interference margin; macrocell-femtocell; orthogonal frequency division multiple access (OFDMA);
Journal_Title :
Systems Journal, IEEE
DOI :
10.1109/JSYST.2012.2223536
