A Superimposed Pilot-Based Integrated Radar and Communication System

• Published in: IEEE access Vol. 8; pp. 11520 - 11533
• Main Authors: Bao, Dan, Qin, Guodong, Dong, Yang-Yang
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Channel estimation; Communications systems; Doppler effect; Integrated radar and communication; Maximum likelihood decoding; MIMO; MIMO communication; MIMO radar; Moving targets; Normal distribution; OFDM; Orthogonal Frequency Division Multiplexing; OSTBC; Performance degradation; Radar; superimposed pilot; Transmitting antennas
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2020.2965153

In this paper, a multiple-input multiple-output (MIMO) integrated radar and communication system based on orthogonal frequency division multiplexing (OFDM) signals is proposed. We consider a bistatic scenario. Exploiting superimposed pilots and orthogonal space-time block code (OSTBC) precoding, transmitted power can be effectively used in both information symbol sending and target sensing with little energy waste and performance degradation. The expectation maximization (EM) is employed to estimate unknown symbols and the channel jointly, which can take the place of matched filtering in traditional radar. In the EM algorithm, we propose to calculate the channel expectation by using Gaussian distribution of the symbol estimation, which can make full use of the OSTBC property of sensing spatial diversity with fast maximum likelihood decoding. The autocorrelation response, and the Doppler response of moving targets in slow time are verified by numerical experiments. Simulations also show superimposed pilot is suitable in the integrated radar and communication system, even when targets with large Doppler shift exist.