TY - GEN
T1 - A nullspace-based precoder with subspace expansion for radar/communications coexistence
AU - Babaei, Alireza
AU - Tranter, William H.
AU - Bose, Tamal
PY - 2013
Y1 - 2013
N2 - In this paper we consider spectrum sharing between a communication system, modeled as MIMO interference channel (MIMO IFC), and MIMO radar. We first derive a zero-forcing precoder to eliminate the interference at the communication receivers. We show that this precoder is equivalent to orthogonal projection matrix onto the null space of an effective interference channel and show that this choice of precoder will degrade the radar target direction estimation performance. We show that the radar performance can be improved at the cost of non-zero interference at communication users by projecting the radar signal onto a subspace which is an expanded version of the aforementioned null space. We propose two approaches to smoothly expand the projected subspace and study the tradeoff between radar performance and interference at the communication users through simulation.
AB - In this paper we consider spectrum sharing between a communication system, modeled as MIMO interference channel (MIMO IFC), and MIMO radar. We first derive a zero-forcing precoder to eliminate the interference at the communication receivers. We show that this precoder is equivalent to orthogonal projection matrix onto the null space of an effective interference channel and show that this choice of precoder will degrade the radar target direction estimation performance. We show that the radar performance can be improved at the cost of non-zero interference at communication users by projecting the radar signal onto a subspace which is an expanded version of the aforementioned null space. We propose two approaches to smoothly expand the projected subspace and study the tradeoff between radar performance and interference at the communication users through simulation.
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U2 - 10.1109/GLOCOM.2013.6831613
DO - 10.1109/GLOCOM.2013.6831613
M3 - Conference contribution
AN - SCOPUS:84904116579
SN - 9781479913534
T3 - GLOBECOM - IEEE Global Telecommunications Conference
SP - 3487
EP - 3492
BT - 2013 IEEE Global Communications Conference, GLOBECOM 2013
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2013 IEEE Global Communications Conference, GLOBECOM 2013
Y2 - 9 December 2013 through 13 December 2013
ER -