Title :
When is FDMA Sum-Rate Optimal in 2x2 Gaussian Interference Channel?
Author :
Qianxi Lu ; Tao Peng ; Chao Hu ; Wenbo Wang
Author_Institution :
Wireless Signal Process. & Network Lab. (WSPN), Beijing Univ. of Posts & Telecommun. (BUPT), Beijing, China
Abstract :
Consider a 2×2 Gaussian interference channel system in a frequency flat environment. We aim to derive sufficient conditions under which frequency division multiple access (FDMA) is optimal, in the objective of sum-rate maximization under power budget constraints of individual users. Two types of conditions are obtained. Briefly, the former one states that the normalized interference channel gain has to be large enough. The corresponding formula can be further extended to K×K (K>2) multi-user scenario. The latter one is that the power budget has to be large enough, even if the normalized interference channel gain is small.
Keywords :
Gaussian channels; frequency division multiple access; optimisation; radiofrequency interference; FDMA optimal sum-rate; Gaussian interference channel system; frequency division multiple access; frequency flat environment; multiuser scenario; normalized interference channel gain; power budget constraint; sum-rate maximization; Bandwidth; Crosstalk; Frequency division multiaccess; Interference channels; Nickel; Resource management; FDMA optimality; interference channel; sum-rate maximization;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2014.030114.140416
