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Cooperative transmission is an efficient solution to improve the performance of wireless communications over fading channels without the need for physical co-located antenna arrays. Current cooperative transmission schemes for two users can only achieve maximum diversity order of 2. In this paper, we propose a novel cooperative transmission scheme with amplify-and-forward relay which can obtain the...
This paper presents modulation classification method capable of classifying incident digital signals without a priori information using WT key features and SVM. These key features for modulation classification should have good properties of sensitive with modulation types and insensitive with SNR variation. In this paper, the 4 key features using WT coefficients, which have the property of insensitive...
Since the UWB (ultra-wideband) communications system occupies very large bandwidth, it performs high- precision ranging. In this paper a novel chirp signal is proposed for DS (direct-sequence)-UWB ranging. The cubic-phase linear (CPL) chirp exhibits enhanced correlation function in the aspect of mainlobe-1st sidelobe ratio. And this enables the better pilot signal detection than the existing quadratic-phase...
Ultra wideband (UWB) systems are inherently designed in coexistence with other wireless systems. In this paper, we investigate the mutual interference impacts between different UWB systems and a NB system using QPSK as an example. The performance of both UWB and NB systems in additive white Gaussian noise (AWGN) channel is evaluated by passband simulations in the radio frequency domain. It is found...
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