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In this paper, an OFDM-based high resolution, channel sounding (CS) method is proposed under T/2-spaced sampling. The proposed CS method consists of three iterative steps. In each iteration, it attempts to catch a new path with accurate fractional delay. Besides, it is equipped with EDC criterion for path order determination. The CFR-MSE performance can be greatly improved over the conventional LS...
In certain OFDM-based communication systems for which data demodulation is not the final goal, it is often of interest to estimate the signal-to-noise power ratio (SNR) from observed samples that are taken asynchronously. Examples include link quality monitoring in broadcast repeaters and spectrum sensing in cognitive radio systems. We examine the structure of the Maximum Likelihood estimate for this...
Carrier frequency synchronization is a key problem for MIMO-OFDM systems. In this paper, a low-complexity semi-blind carrier frequency offset (CFO) estimation method exploiting the known intrinsic structure information of OFDM signalspsila virtual carriers has been presented. Within small estimation range, the new method can get highly accurate CFO estimation. When the estimation range is widened,...
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