2 research outputs found
Optimum Design for Coexistence Between Matrix Completion Based MIMO Radars and a MIMO Communication System
Recently proposed multiple input multiple output radars based on matrix
completion (MIMO-MC) employ sparse sampling to reduce the amount of data that
need to be forwarded to the radar fusion center, and as such enable savings in
communication power and bandwidth. This paper proposes designs that optimize
the sharing of spectrum between a MIMO-MC radar and a communication system, so
that the latter interferes minimally with the former. First, the communication
system transmit covariance matrix is designed to minimize the effective
interference power (EIP) to the radar receiver, while maintaining certain
average capacity and transmit power for the communication system. Two
approaches are proposed, namely a noncooperative and a cooperative approach,
with the latter being applicable when the radar sampling scheme is known at the
communication system. Second, a joint design of the communication transmit
covariance matrix and the MIMO-MC radar sampling scheme is proposed, which
achieves even further EIP reduction.Comment: 31 pages, 15 figure
Performance Tradeoff in a Unified System of Communications and Passive Radar: A Secrecy Capacity Approach
In a unified system of passive radar and communication systems of joint
transmitter platform, information intended for a communication receiver may be
eavesdropped by a passive radar receiver (RR), thereby undermining the security
of communications system. To minimize this information security risk, in this
paper, we propose a unified passive radar and communications system wherein the
signal-to-interference and noise ratio (SINR) at the RR is maximized while
ensuring that the information secrecy rate is above a certain threshold value.
We consider both scenarios wherein transmissions of the radar waveform and
information signals are scheduled with the disjoint (non-overlapping case) as
well as with the same set of resources (overlapping case). In both cases, the
underlying optimization problems are non-convex. In the former case, we propose
alternating optimization (AO) techniques that employ semidefinite programming
and computationally efficient semi-analytical approaches. In the latter case,
AO method based on semi-definite relaxation approach is proposed to solve the
optimization problem. By changing the threshold value of the information
secrecy rate, we then characterize the performance tradeoff between passive
radar and communication systems with the boundaries of the SINR-secrecy
capacity regions. The performance comparison of the proposed optimization
methods demonstrate the importance of the semi-analytical approach and the
advantage of overlapping case over non-overlapping one.Comment: To appear in Digital Signal Processing, special issue on Joint Radar
and Communication