J4 ›› 2016, Vol. 43 ›› Issue (1): 71-74+150.doi: 10.3969/j.issn.1001-2400.2016.01.013

• Original Articles • Previous Articles     Next Articles

Sum capacity of Gaussian X channels with noisy interference

LI Jing;GE Jianhua   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China)
  • Received:2014-08-21 Online:2016-02-20 Published:2016-04-06
  • Contact: LI Jing E-mail:jhge@xidian.edu.cn

Abstract:

If the sum capacity of a channel can be achieved by treating interference as noise, we say that this channel is under noisy interference. By analyzing the sum capacity of Gaussian X channels, sufficient conditions for such channels under noisy interference are proposed. Providing vector genies and auxiliary sets as side information to the receivers, a sum-rate upper bound is obtained. Under the noisy interference sufficient conditions, this sum-rate upper bound can be achieved by operating the original channel as the underlying Gaussian interference channel and treating interference as noise. Therefore, the sum capacity of the Gaussian X channel is determined for noisy interference.

Key words: X channel, sum capacity, noisy interference