Title :
Structured lattice codes for 2×2×2 MIMO interference channel
Author :
Song-Nam Hong ; Caire, Giuseppe
Author_Institution :
Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
We consider the 2 × 2 × 2 multiple-input multiple-output interference channel where two source-destination pairs wish to communicate with the aid of two intermediate relays. In this paper we present a novel lattice strategy called Precoded Compute-and-Forward (PCoF) with Channel Integer Alignment (CIA). This scheme consists of two phases: 1) Using the CoF framework based on CIA we convert the Gaussian network into a deterministic finite-field network. 2) Using linear precoding (over finite-field) we eliminate the end-to-end interference in the finite-field domain. Further, we exploit the algebraic structure of lattices to enhance the performance at finite SNR, such that beyond a degree of freedom result (also achievable by other means). We can also show that PCoF with CIA outperforms timesharing in a range of reasonably moderate SNR, with increasing gain as SNR increases.
Keywords :
MIMO communication; channel coding; interference suppression; linear codes; precoding; relay networks (telecommunication); 2×2×2 MIMO interference channel; CIA; Gaussian network; PCoF framework; algebraic lattices structure; channel integer alignment; degree of freedom; deterministic finite-field network; end-to-end interference; finite SNR; finite-field domain; intermediate relays; linear precoding; multiple-input multiple-output interference channel; precoded compute-and-forward lattice strategy; source-destination pairs; structured lattice codes; Integrated circuits; Interference channels; Lattices; MIMO; Receivers; Relays; Signal to noise ratio;
Conference_Titel :
Information Theory Proceedings (ISIT), 2013 IEEE International Symposium on
Conference_Location :
Istanbul
DOI :
10.1109/ISIT.2013.6620622