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Two sets of bit error rate (BER) lower bounds for precoded orthogonal frequency division multiplexing (OFDM) systems using minimum mean square error (MMSE) equalization over frequency-selective multipath fading channels are evaluated by Monte Carlo method in this paper. The first set represents the best performance under different data group sizes used for precoding, whereas the second set represents...
We address pilot-aided channel estimation for a flat-fading spatially-correlated MIMO system, which employing Uniform Linear Arrays(ULA) on dual side and working in sparse scattering (multipath) environment. In case of sparse scattering, channel matrix and spatial correlation of flat-fading MIMO systems are parameterized by structure of multipaths, which is represented as Direction of Arrivals(DOAs),...
Carrier frequency difference (CFD) detection plays a special role in signal classification and selection. Unfortunately, the CFD between co-channel signals transmitted by different transmitters at the so-called "same frequency" is often too small to detect. This paper applies the phase entropy theory to small CFD detection and we achieve superior results. We proved that the phase entropy...
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