Acta Metallurgica Sinica(English letters) ›› 2015, Vol. 22 ›› Issue (1): 11-16.doi: 10.1016/S1005-8885(15)60619-7

• Wireless • Previous Articles     Next Articles

Ergodic interference alignment for MIMO interference system with variable channel

  

  • Received:2014-09-22 Revised:2014-11-23 Online:2015-02-28 Published:2015-02-28
  • Supported by:

    National Science and Technology Major Projects;National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China;Beijing Key Laboratory of Work Safety Intelligent Monitoring

Abstract: The authors pay focus on the K user multiple-input multiple-output (MIMO) Gaussian interference channel (IC) with M transmitting antennas and N receiving antennas, in which and . The channel coefficients are variable, time varying or frequency selectively drawn from a continuous distribution. Based on ergodic interference alignment (IA), an achievable scheme was proposed to achieve a total of degrees of freedom (DoF). The ergodic IA scheme can reach the optimal DoF value with simply linear beamforming and finite symbols. Furthermore, the achievable rate of the ergodic IA scheme was derived at any signal-to-noise ratio (SNR). With numerical simulation, the performance of the proposed scheme is evaluated.

Key words: degrees of freedom, ergodic interference alignment, interference channel, multiple-input multiple-output