8th International Conference on Cognitive Radio Oriented Wireless Networks

Research Article

A Practical Precoding Approach for Radar/Communications Spectrum Sharing

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  • @INPROCEEDINGS{10.4108/icst.crowncom.2013.252021,
        author={Alireza Babaei and William Tranter and Tamal Bose},
        title={A Practical Precoding Approach for Radar/Communications Spectrum Sharing},
        proceedings={8th International Conference on Cognitive Radio Oriented Wireless Networks},
        publisher={ICST},
        proceedings_a={CROWNCOM},
        year={2013},
        month={11},
        keywords={spectrum sharing radar precoder zero-forcing null space},
        doi={10.4108/icst.crowncom.2013.252021}
    }
    
  • Alireza Babaei
    William Tranter
    Tamal Bose
    Year: 2013
    A Practical Precoding Approach for Radar/Communications Spectrum Sharing
    CROWNCOM
    IEEE
    DOI: 10.4108/icst.crowncom.2013.252021
Alireza Babaei1,*, William Tranter1, Tamal Bose2
  • 1: Virginia Tech
  • 2: University of Arizona
*Contact email: ababaei@vt.edu

Abstract

In this paper, we consider spectrum sharing between multiple-input multiple-output (MIMO) radar system and a communication system modeled as MIMO interference channel. We derive a zero-forcing precoder for radar transmitter which completely eliminates the radar interference to communication users. Obtaining the precoder requires the knowledge of an effective interference channel matrix composed of the channel matrices to all of the communication receivers and the postprocessing matrices employed by them. We propose a channel estimation phase in which all of the communication receivers coordinate in their choice of training symbols and power transmission and the radar transmitter can estimate the effective interference channel. We investigate the effect of radar precoder and channel estimation error on the performance of radar and interference to communication receivers. Our results indicate that while the precoder null steers the radar interference to communication users it degrades the radar performance by introducing correlation to the probing signals. We show that this performance loss can be compensated for by increasing the number of radar antennas.