KEYWORDS: Modulation, Interference (communication), Signal processing, Frequency modulation, Signal attenuation, Orthogonal frequency division multiplexing, Background noise, Pulse signals, Modulation frequency, Signal to noise ratio
To address the issue of interference caused by power line channel noise on time transmission signals, a power line time transmission technology based on OFDM modulation is proposed to use linear frequency modulation (LFM) and direct sequence spread spectrum (DS) techniques for its subcarriers. The simulation results show that the power line time transfer technology using LFM-OFDM and DS-OFDM modulation can effectively reduce the bit error rate of the received signal. At the same time, compared to DS-OFDM modulation technology, the power line time transfer technology using LFMOFDM modulation has a lower bit error rate of the received signal.
Enhanced Loran (eLoran) system plays an important role in the national positioning, navigation, and timing (PNT) fields. The information demodulation capability of its user receiving end also directly affects the application coverage of the system. Using the existing arctangent and matched filter demodulation algorithms, we propose a novel algorithm based on log likelihood ratio (LLR) information, and then analyzing the implementation process of these three algorithms in detail and simulating the system performance difference in an additive white Gaussian noise (AWGN) environment. The results showed that the performance difference of the three algorithms was between 0.5 dB and 1 dB, and the proposed algorithm was 0.5 dB better than the arctangent demodulation which is more widely used in engineering practice. Simultaneously, the proposed algorithm can be used to provide an algorithm basis for the study of the eLoran system to switch to modern channel coding methods with LLR information as the decoding input.
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