5 research outputs found
Code shift keying based joint radar and communications for EMCON applications
The article of record as published may be found at http://dx.doi.org/10.1016/j.dsp.2018.05.013Due to the explosion in the demand for broadband wireless services by consumers, wireless network
service providers require increased frequency allocations from an already crowded frequency spectrum. In
an effort to satisfy the increased frequency spectrum requirements of wireless communications networks,
several methods have been proposed to allow communication systems and radars to co-exist within
the same bandwidth or adjacent frequency bands while minimizing or preventing mutual interference.
Most methods explored in the literature focus on the use of cognitive sensing and dynamic spectrum
allocation. Other proposed methods to prevent mutual interference between radar and communications
systems focus on waveform design. In this manuscript, a dual function communication and radar system
with EMCON applications is investigated that uses Gold or Kasami codes in a code shift keying digital
modulation scheme. The use of both binary phase shift keying (BPSK) and quaternary phase shift keying
(QPSK) to modulate the code bits is investigated. The communications signal is used as the radar
signal to implement a pseudo-random BPSK or QPSK coded radar. The symbol error rate (SER) of the
communication system is determined through Monte Carlo simulations and compared to an SER upper
bound for M-ary frequency shift keying. The radar signal’s periodic autocorrelation function (PACF) and
periodic ambiguity function are also examined demonstrating the schemes potential for use in a low
probability of intercept radar application. The radar signal’s characteristics are compared when using
pseudo-random BPSK and QPSK modulations.Center for Cyber-Warfare at Naval Postgraduate Schoo