On the Error Rate of a Communication System Suffering from Additive Radar Interference

In the near future, radar and communication systems will share the spectrum. This motivates the study of how the two systems, which have traditionally operated in different bands, may co-exist. This paper investigates the effect of radar interference (unaltered, beyond the communication system designer's control) on an uncoded communication system, using complex-valued modulation schemes when the Maximum-A-Posteriori (MAP) detector is used. For all commonly used higher order modulation schemes, the Symbol Error Rate (SER) exhibits an "error floor" for the radar interference much larger than the signal power, which can be exactly characterized; in this regime the optimal MAP detector behaves like an interference canceller; interestingly, in this regime the channel behaves as a real-valued phase- fading AWGN channel with receiver CSI, thus indicating a loss of one of the two complex dimensions compared to the complex-valued interference-free channel.

[1]  Daniela Tuninetti,et al.  On the Capacity of the AWGN Channel With Additive Radar Interference , 2018, IEEE Transactions on Communications.

[2]  Ahmed Abdel-Hadi,et al.  Spectrum Sharing Approach between Radar and Communication Systems and Its Impact on Radar's Detectable Target Parameters , 2015, 2015 IEEE 81st Vehicular Technology Conference (VTC Spring).

[3]  Jack H. Winters,et al.  Overview of interference mitigation techniques between WiMAX networks and ground based radar , 2011, 2011 20th Annual Wireless and Optical Communications Conference (WOCC).

[4]  Daniela Tuninetti,et al.  Let's share CommRad: Effect of radar interference on an uncoded data communication system , 2016, 2016 IEEE Radar Conference (RadarConf).

[5]  Ahmed Abdel-Hadi,et al.  Overlapped-MIMO radar waveform design for coexistence with communication systems , 2015, 2015 IEEE Wireless Communications and Networking Conference (WCNC).

[6]  Awais Khawar,et al.  Spectrum sharing between S-band radar and LTE cellular system: A spatial approach , 2014, 2014 IEEE International Symposium on Dynamic Spectrum Access Networks (DYSPAN).

[7]  Hang Zheng,et al.  The Communication Solution for LTE System under Radar Interference Circumstance , 2015 .

[8]  Michael G. Cotton.  A Methodology for Approximating BPSK Demodulator Performance in the Presence of Various Undesired Signals , 2008 .

[9]  Zaiki Awang,et al.  Analysis of interference from UWB radar signals on a digital OFDM transmission system , 2011, 2011 IEEE International Conference on System Engineering and Technology.

[10]  Brian D. Cordill,et al.  Electromagnetic interference to radar receivers due to in-band OFDM communications systems , 2013, 2013 IEEE International Symposium on Electromagnetic Compatibility.

[11]  Braham Himed,et al.  Interference Mitigation Processing for Spectrum-Sharing Between Radar and Wireless Communications Systems , 2013, IEEE Transactions on Aerospace and Electronic Systems.

[12]  Huaiyi Wang,et al.  On spectrum sharing between communications and air traffic control radar systems , 2015, 2015 IEEE Radar Conference (RadarCon).

[13]  Shabnam Sodagari,et al.  A projection based approach for radar and telecommunication systems coexistence , 2012, 2012 IEEE Global Communications Conference (GLOBECOM).

[14]  B. D. Cordill,et al.  Radar performance degradation with in-band OFDM communications system interference , 2013, 2013 US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM).