Abstract
In order to further exploit the potential of joint multi-antenna radar-communication (RadCom) system, we propose two transmission techniques respectively based on separated and shared antenna deployments. Both techniques are designed to maximize the weighted sum rate (WSR) and the probing power at target's location under average power constraints at the antennas such that the system can simultaneously communicate with downlink users and detect the target within the same frequency band. Based on a Weighted Minimized Mean Square Errors (WMMSE) method, the separated deployment transmission is designed via semidefinite programming (SDP) while the shared deployment problem is solved by majorization-minimization (MM) algorithm. Numerical results show that the shared deployment outperforms the separated deployment in radar beamforming. The tradeoffs between WSR and probing power at target are compared among both proposed transmissions and two practically simpler dual-function implementations i.e., time division and frequency division. Results show that although the separated deployment enables spectrum sharing, it experiences a performance loss compared with frequency division, while the shared deployment outperforms both and surpasses time division in certain conditions.
Highlights
The 4th and 5th generation wireless communication systems are competing with long-range radar applications in the S-band (2-4GHz) and C-band (4-8GHz), which will possibly result in severe spectrum congestion and hamper the higher data rate requirements of future wireless communications [1]
We propose to reformulate the problem into semidefinite programming (SDP) based on Weighted Minimized Mean Square Errors (WMMSE) method
We propose a majorization-minimization (MM) iterative algorithm based on WMMSE to effectively solve the problem
Summary
The 4th and 5th generation wireless communication systems are competing with long-range radar applications in the S-band (2-4GHz) and C-band (4-8GHz), which will possibly result in severe spectrum congestion and hamper the higher data rate requirements of future wireless communications [1]. One significant restriction of such a dual-function system is that the rate is limited by the Pulse Repetition Frequency (PRF), which is far from satisfactory for communication requirements To overcome this problem, [17] proposes a joint multi-antenna radarcommunication (RadCom) system defined as a dual-function platform simultaneously transmitting probing signals to radar targets and serving multiple downlink users. Both functions are realized within the same frequency band. CONTRIBUTION In this article, we propose two multi-antenna RadCom transmission design techniques based on separated and shared antenna deployments respectively Both techniques enable the platform to simultaneously communicate with downlink users and probe one target of interest within the same frequency band.
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