Opportunistic Interference Alignment for Spectrum Sharing between Radar and Communication Systems

Abstract

In this paper, we propose a novel opportunistic interference alignment technique for spectrum-shared radar and uplink cellular communication systems where both systems are equipped with multiple antennas. In the proposed OIA technique, the radar system sends its signal so that the radar signal is received into interference space at base stations (BSs) of the cellular system, while each uplink user (UE) generates its transmit beamforming vector so that communication signals are received within interference space at the radar receiver. Moreover, to achieve better sum-rate performance of the cellular communication system, the BS selects the UEs which results in sufficiently small interference to other cells for the uplink communication. With the proposed OIA technique, detection performance of the radar system is protected, while the communication system achieves satisfactory sum-rate performance. Through extensive computer simulations, we show that the performances of both radar and communication systems with the proposed technique significantly outperform a conventional null-space projection based spectrum sharing scheme.

Interference Cancellation Based Spectrum Sharing for Massive MIMO Communication Systems

“…The components of are independent, identically distributed, moreover annular proportional and randomly distributed equivalent to complex Gaussian with zero-mean, hence accepting Rayleigh dispersion. Furthermore, meticulous and comprehensive analysis of interference channel for radar and mobile communications systems, along with more than two special channels, are presented in [ 28 , 33 , 40 ]. Our goal here is to map x(t) toward null space interference , by canceling interference at base station, such as , so that should be Equation (7) instead of Equation (8).…”

“…Additionally, an opportunistic interference-alignment method was proposed for effectively combining the interference alignment (OIA) technique with a UE scheduling approach for both multiuser downlink and uplink networks communications [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ], and all this work is cellular-communication-centric. An opportunistic interference alignment approach for spectrum-shared radar and uplink cellular communications systems was proposed in [ 28 ], where both systems were equipped with multiple antennas. To achieve good performance, the author put more focus on the uplink of the user equipment (UE) of the base stations, rather than the radar that carries heavy frequencies and often causes disturbance in the sharing performance [ 8 ].…”

Multistatic Passive Radar for drone detection based Random Finite State

“…H 𝑖 are complex Gaussian zero means identical, independent, and distributed, following Rayleigh spreading order. Moreover, feasible and exhaustive interference studies between radar and cellular communication schemes with more than two channels, are developed here [40][41][42].…”