Abstract
The abundance of radio signals and their increasing number creates interferences on adjacent signals and sometimes, with co-channel communication. Jammers, which are operated by hackers or by military forces, are another source of smart and powerful interferences. This paper will discuss the effect of the continuous wave interference (CWI) on a radio communication receiver, specifically with the Digital Video Broadcasting for Satellite Second Generation (DVB-S2) communication standard. It investigates the general effect of the interference on a Quadrature Phase Shift Keying (QPSK) signal over each part of the DVB-S2 receiver. It also focuses on the impact of the center frequency and power of the interference on the critical blocks of a DVB-S2 receiver. This study also tries to determine the deviation from the normal operation in the format of mathematical expressions and simulation results. Based on the obtained results, there is a vulnerability in the chain of the receiver’s blocks that allows a smart jammer to affect the device with low power interference. The notch filter is utilized as a solution to mitigate the interference. In addition, the effects of this technique on the system’s performance are studied. The simulation results show that there is a great improvement after CWI removal according to the Jamming to Signal Ratio (JSR), the Signal-to-Noise Ratio (SNR), and the Bit Error Rate (BER). In some cases, the JSR was reduced by 15 dB, the SNR was improved by 10 dB and BER also improved by 7 dB. However, the notch filter deletes some information from the original signal. This study introduces new ways to clarify the tradeoff between the amount of interference power reduction and removed bandwidth from the signal with notch filtering.
Highlights
The presence of radio frequency interference (RFI) on a radio signal can result from adjacent frequency band communications bleeding over the signal or co-channel communication [1].This problem occurs more often because the communication bands are getting busier and closer to each other with the increase in demand for radio frequency (RF) communications
This study introduces new ways to clarify the tradeoff between the amount of interference power reduction and removed bandwidth from the signal with notch filtering
This paper investigates the effect of continuous wave interference (CWI) on each section of a DVB-S2 [10] receiver and its removal with an adaptive notch filter
Summary
The presence of radio frequency interference (RFI) on a radio signal can result from adjacent frequency band communications bleeding over the signal or co-channel communication [1]. By analyzing the effect of the narrowband interference on the receiver, it will be easier to target the optimal position of the mitigation system in the structure to enhance the CWI detection and removal process. The two most common effects are Doppler (or carrier shift) and variable time delay in path link [10] To handle these negative channel effects and compensate for their drawbacks, a typical digital receiver utilizes different digital signal processing blocks. This paper investigates the effect of CWI on each section of a DVB-S2 [10] receiver and its removal with an adaptive notch filter. That means that it is sharing the same digital signal processing blocks as DVB-S2 This standard represents relatively well the reception structure of most other telecommunication standards. All selected algorithms are those that are highly recommended in the user manual and structure of the DVB-S2 standard and based on those algorithms, the DVB-S2 standard can achieve performance close to the Shannon–Hartley limit [10]
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