tailieunhanh - Báo cáo toán học: " On the interchannel interference in digital communication systems, its impulsive nature, and its mitigation"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: On the interchannel interference in digital communication systems, its impulsive nature, and its mitigation | Nikitin EURASIP Journal on Advances in Signal Processing 2011 2011 137 http content 2011 1 137 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access On the interchannel interference in digital communication systems its impulsive nature and its mitigation Alexei V Nikitin1 2 Abstract A strong digital communication transmitter located in close physical proximity to a receiver of a weak signal can noticeably interfere with the latter even when the respective channels are tens or hundreds of megahertz apart. When time domain observations are made in the signal chain of the receiver between the first mixer and the baseband this interference is likely to appear impulsive. Understanding the mechanism of this interference is important for its effective mitigation. In this article we show that impulsiveness or a high degree of peakedness of interchannel interference in communication systems results from the non-smooth nature of any physically realizable modulation scheme for transmission of a digital discontinuous message. Even modulation schemes designed to be smooth . continuous-phase modulation are in fact not smooth because their higher order time derivatives still contain discontinuities. When observed by an out-of-band receiver the transmissions from these discontinuities may appear as strong transients with the peak power noticeably exceeding the average power and the received signal will have a high degree of peakedness. This impulsive nature of the interference provides an opportunity to reduce its power by nonlinear filtering thus improving quality of the receiver channel. Keywords electromagnetic interference impulsive noise interchannel interference nonlinear differential limiters nonlinear filtering peakedness 1 Introduction Nowadays it is becoming more and more common that multiple digital communication devices including wireless coexist and concurrently operate in close physical proximity. A

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