TY - JOUR
T1 - Maximally improper signaling in underlay mimo cognitive radio networks
AU - Lameiro, Christian
AU - Santamaria, Ignacio
AU - Schreier, Peter J.
AU - Utschick, Wolfgang
N1 - Publisher Copyright:
© 1991-2012 IEEE.
PY - 2019/12/15
Y1 - 2019/12/15
N2 - Improper Gaussian signaling is a well-known technique that has been shown to improve performance in different multi-user scenarios. In this paper, we analyze the benefit of improper signaling in underlay cognitive radio when users are equipped with multiple antennas. Specifically, we assume that the primary user is protected by the so-called interference temperature constraint, which guarantees a prescribed rate requirement. In this setting, we study how the maximum tolerable interference power changes when the interference is additionally constrained to be maximally improper (strictly noncircular, or rectilinear). We observe that the correlation structure of a maximally improper interference is an additional degree of freedom that can be exploited to improve the SU performance. Because of that, we propose two different protection strategies for the PU where this structure is either constrained or unconstrained, and derive the interference temperature threshold for both cases. We then focus on the secondary user and provide designs of the transmission parameters under the proposed protection strategies.
AB - Improper Gaussian signaling is a well-known technique that has been shown to improve performance in different multi-user scenarios. In this paper, we analyze the benefit of improper signaling in underlay cognitive radio when users are equipped with multiple antennas. Specifically, we assume that the primary user is protected by the so-called interference temperature constraint, which guarantees a prescribed rate requirement. In this setting, we study how the maximum tolerable interference power changes when the interference is additionally constrained to be maximally improper (strictly noncircular, or rectilinear). We observe that the correlation structure of a maximally improper interference is an additional degree of freedom that can be exploited to improve the SU performance. Because of that, we propose two different protection strategies for the PU where this structure is either constrained or unconstrained, and derive the interference temperature threshold for both cases. We then focus on the secondary user and provide designs of the transmission parameters under the proposed protection strategies.
KW - Improper Gaussian signaling
KW - MIMO systems
KW - interference tem-perature
KW - majorization theory
KW - transceiver optimization
KW - underlay cognitive radio
UR - http://www.scopus.com/inward/record.url?scp=85076799601&partnerID=8YFLogxK
U2 - 10.1109/TSP.2019.2953665
DO - 10.1109/TSP.2019.2953665
M3 - Article
AN - SCOPUS:85076799601
SN - 1053-587X
VL - 67
SP - 6241
EP - 6255
JO - IEEE Transactions on Signal Processing
JF - IEEE Transactions on Signal Processing
IS - 24
M1 - 8902025
ER -