Interference channel with a half-duplex Out-of-Band Relay

A Gaussian interference channel (IC) aided by a half-duplex relay is considered, in which the relay receives and transmits in an orthogonal band with respect to the IC. The system thus consists of two parallel channels, the IC and the channel over which the relay is active, which is referred to as Out-of-Band Relay Channel (OBRC). The OBRC is operated by separating a multiple access phase from the sources to the relay and a broadcast phase from the relay to the destinations. Conditions under which the optimal operation, in terms of the sum-capacity, entails either signal relaying and/or interference forwarding by the relay are identified. These conditions also assess the optimality of either separable or non-separable transmission over the IC and OBRC. Specifically, the optimality of signal relaying and separable coding is established for scenarios where the relay-to-destination channels set the performance bottleneck with respect to the source-to-relay channels on the OBRC. Optimality of interference forwarding and non-separable operation is also established in special cases.

[1]  Elza Erkip,et al.  Interference Channel aided by an Infrastructure Relay , 2009, 2009 IEEE International Symposium on Information Theory.

[2]  Sae-Young Chung,et al.  On the separability of parallel Gaussian interference channels , 2009, 2009 IEEE International Symposium on Information Theory.

[3]  Hua Wang,et al.  Gaussian Interference Channel Capacity to Within One Bit , 2007, IEEE Transactions on Information Theory.

[4]  Aylin Yener,et al.  The Gaussian Interference Relay Channel with a Potent Relay , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.

[5]  H. Vincent Poor,et al.  Noisy-Interference Sum-Rate Capacity of Parallel Gaussian Interference Channels , 2009, IEEE Transactions on Information Theory.

[6]  Tie Liu,et al.  An Extremal Inequality Motivated by Multiterminal Information-Theoretic Problems , 2006, IEEE Transactions on Information Theory.

[7]  Andrea J. Goldsmith,et al.  Relay strategies for interference-forwarding , 2008, 2008 IEEE Information Theory Workshop.

[8]  Andrea J. Goldsmith,et al.  On the capacity of the interference channel with a relay , 2008, 2008 IEEE International Symposium on Information Theory.

[9]  Elza Erkip,et al.  Achievable Rates for the Gaussian Interference Relay Channel , 2007, IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference.

[10]  H. Vincent Poor,et al.  Ergodic Fading Interference Channels: Sum-Capacity and Separability , 2009, IEEE Transactions on Information Theory.

[11]  Syed Ali Jafar,et al.  Parallel Gaussian Interference Channels Are Not Always Separable , 2009, IEEE Transactions on Information Theory.

[12]  Shlomo Shamai,et al.  On the capacity of cognitive relay assisted Gaussian interference channel , 2008, 2008 IEEE International Symposium on Information Theory.