A high powered radar interference mitigation technique for communications signal recovery with FPGA implementation
Meager, Geoffrey R.
Romero, Ric A.
MetadataShow full item record
In this thesis, we investigate the demodulation of a communications signal that is interfered with by a high-powered radar signal. We choose quaternary phase-shift keying (QPSK) modulation for illustration. The radar phase offset is initially assumed to be fixed. Later, a practical phase sequence is added to the phase offset. A least-squares estimator (LSE) is used to estimate the amplitude and fixed-phase offset of the interfering radar signal to be used for interference cancellation. Then, we utilize a maximum-likelihood detection (MLD) receiver. We show that the QPSK symbol error ratio (SER) improvement in the radar interference depends on collection time. The variance of the estimate increases as the QPSK signal-to-noise ratio (SNR) increases. The increase in variance affects SER. SER results approach the ideal with increasing collection times. For the case where the phase offset includes a phase sequence, the original LSE technique is modified. Later, a system is created in Simulink and converted to hardware-description language (HDL). The SER performance of the HDL implementation in hardware is compared to those of the signal model. SER performance is somewhat degraded in the hardware implementation. [Reprinted in part, with permission, from G. Meager, R.A. Romero, Z. Staples, Estimation and cancellation of high powered radar interference for communication signal collection, in 2016 IEEE Radar Conf., 2016, pp. 1–4, doi: 10.1109/RADAR.2016.7485263.]
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Lim, Chai Meng (Monterey, California: Naval Postgraduate School, 2018-03);The benefits of wind turbines as a means for renewable energy generation are offset by the turbines’ creation of signal interference, such as Doppler shift, for radar systems used for air traffic control and weather ...
New algorithms for the detection and elimination of sine waves and other narrow-band signals in the presence of broadband signals and noise Soderstrand, Michael A.; Rangarao, Kaluri Venkata.; Loomis, Herschel H. (Monterey, California. Naval Postgraduate School, 1992-10); NPS-EC-93-005Four different classes of adaptive signal cancelers can be used to eliminate narrow-band interference from a broadband signal: (1) cascaded second- order notch filters, (2) high-order in-line notch filters, (3) second-order ...
Detection of a low power communication signal in the presence of a strong co-channel TV broadcast interference using Kalman filter Sajid, Attique (Monterey, California: Naval Postgraduate School, 2014-12);This research focuses on the detection of a low power communication signal in the presence of a strong co-channel television broadcast interference signal. The presence of strong co-channel interference makes the recovery ...