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Abstract
Transmission and reception of digitally modulated microwave (MW) and millimeter-wave (MMW) radio signals in point-to-point and point-to-multipoint systems are widely investigated [1-6]. This paper addresses the problem of digital MW/MMW radio reception and demodulation in the simultaneous presence of additive Gaussian white noise [7], [8] and radio-frequency interference in the radio channel. First a novel representation of receiver interference immunity is shown and experimental examples are given. Then we present simulation results for links employing quadrature amplitude modulation (QAM). Receiver constellation diagrams suggest a very demonstrative explanation of bit error rate (BER) degradation due to the interference signal. Finally, based on this physical model, analytical expression is developed to estimate the BER.
