Residual self-interference in full-duplex MIMO relays after null-space projection and cancellation

Practical full-duplex MIMO relays require efficient mitigation of the relay self-interference signal propagating from the transmit antenna array to the receive antenna array; this paper concentrates on time-domain cancellation (TDC) and spatialdomain suppression by null-space projection (NSP). Both schemes can eliminate all self-interference in the idealistic case where the relay has perfect side information on the self-interference channel and signal. Thus, it is of practical interest to analyze their performance in more realistic cases where the side information is non-ideal. In particular, our contribution is to evaluate the additional isolation given by the mitigation schemes w.r.t. natural isolation between spatially separated antenna arrays. We also show how NSP (as opposed to TDC) can be made immune to errors in information on the self-interference signal.

[1]  Anders Høst-Madsen,et al.  Capacity bounds and power allocation for wireless relay channels , 2005, IEEE Transactions on Information Theory.

[2]  Michael Gastpar,et al.  Cooperative strategies and capacity theorems for relay networks , 2005, IEEE Transactions on Information Theory.

[3]  Taneli Riihonen,et al.  Spatial loop interference suppression in full-duplex MIMO relays , 2009, 2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers.

[4]  Bo Wang,et al.  On the capacity of MIMO relay channels , 2005, IEEE Transactions on Information Theory.

[5]  H. Vincent Poor,et al.  Resource Allocation for Wireless Fading Relay Channels: Max-Min Solution , 2007, IEEE Transactions on Information Theory.

[6]  Eui-Rim Jeong,et al.  Pre-Nulling for Self-Interference Suppression in Full-Duplex Relays , 2009 .

[7]  Taneli Riihonen,et al.  Optimized gain control for single-frequency relaying with loop interference , 2009, IEEE Transactions on Wireless Communications.

[8]  Geoffrey Ye Li,et al.  A New Coupling Channel Estimator for Cross-Talk Cancellation at Wireless Relay Stations , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.

[9]  Taneli Riihonen,et al.  On the feasibility of full-duplex relaying in the presence of loop interference , 2009, 2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications.

[10]  Yukihiko Okumura,et al.  Joint Multi-Filter Design for Full-Duplex MU-MIMO Relaying , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[11]  Taneli Riihonen,et al.  Comparison of Full-Duplex and Half-Duplex Modes with a Fixed Amplify-and-Forward Relay , 2009, 2009 IEEE Wireless Communications and Networking Conference.

[12]  Elza Erkip,et al.  Multiple-Antenna Cooperative Wireless Systems: A Diversity–Multiplexing Tradeoff Perspective , 2006, IEEE Transactions on Information Theory.

[13]  Daniel K. C. So,et al.  Asynchronous Polarized Cooperative MIMO Communication , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[14]  Peter Larsson,et al.  MIMO On-Frequency Repeater with Self-Interference Cancellation and Mitigation , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[15]  Aitor del Coso,et al.  On the Gaussian MIMO Relay Channel With Full Channel State Information , 2009, IEEE Transactions on Signal Processing.

[16]  Joon Ho Cho,et al.  Capacity of MIMO wireless channel with full-duplex amplify-and-forward relay , 2009, 2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications.

[17]  D. W. Bliss,et al.  Simultaneous Transmission and Reception for Improved Wireless Network Performance , 2007, 2007 IEEE/SP 14th Workshop on Statistical Signal Processing.

[18]  Taneli Riihonen,et al.  SINR analysis of full-duplex OFDM repeaters , 2009, 2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications.

[19]  Syed Ali Jafar,et al.  Degrees of Freedom of Wireless Networks With Relays, Feedback, Cooperation, and Full Duplex Operation , 2009, IEEE Transactions on Information Theory.

[20]  Taneli Riihonen,et al.  Rate-interference trade-off between duplex modes in decode-and-forward relaying , 2010, 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[21]  Byungjin Chun,et al.  A Spatial Self-Interference Nullification Method for Full Duplex Amplify-And-Forward MIMO Relays , 2010, 2010 IEEE Wireless Communication and Networking Conference.