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Frequency hopping (FH) is widely used in commercial and military communications. The purposes of FH in military communications are anti-jamming and low probability of interception. To implement low probability of detection or interception, FH signals randomly change carrier frequency. There are several kinds of FH detectors for example autocorrelation detector, maximum-likelihood detector and optimum...
This paper proposes a blind interleaver period estimation algorithm by sorting error-less symbols. After finding the error-less symbols through the rank distribution of the square matrices, we construct a rectangular matrix by locating errorless symbols on the top of a matrix. By analyzing this matrix, we can estimate the interleaver period. Experimental results show that the proposed algorithm has...
The utilization of the Ka-band in satellite communication systems is assumed to grow in near future. Studied have been carried out at Korea Radio Promotion Association, Mokdong, Seoul from four years meteorological, Ka-band, sourced from the National Radio Research Agency (RRA). This paper reports the results obtained from Ka-band signal measurement at the Earth station situated in 37.54470N and 126...
State-of-the-art sensing methods only exploit three dimensions of the spectrum space: frequency, time and geography whereas the angle dimension, that is, spatial spectrum sensing has not been exploited well enough. In this paper, we apply the multiple signal classification (MUSIC) Angle of Arrival (AoA) estimation method into spectrum sensing. Note that MUSIC method needs to know the number of signals,...
This paper proposes an algorithm to determine the distance between vehicles for a Intelligent Transport System (ITS) using image sensor based visible light communication. Compared to existing algorithms, the proposed algorithm uses two image sensors and thus requires only one LED for distance estimation. Simulations are conducted to verify the performance of the proposed algorithm.
V2X technology provides communication services between a vehicle and networks, vehicles, and pedestrians. Especially, LTE based V2X is one of the emerging technologies in communications and automotive industries. To transmit and receive safety message among vehicles with V2X communication, new physical frame structure and receiver algorithm are introduced in 3GPP standardization. In particular, V2X...
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