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This paper focuses on the second-order statistics analysis for a cooperative cognitive radio network with Nth best relay (CCRN-NthR) based on reactive decode-and-forward (RDF) protocol. The second-order statistics include average outage rate (AOR) and average outage duration (AOD). To these ends, we first obtain the exact closed-form expressions for the AOR and AOD of the equivalent end-to-end SIR...
The outage performance of decode-and-forward cognitive ratio opportunistic relay (DF CR-OR) systems is investigated over Rayleigh fading environments. We specially consider the case where the systems are impaired by the imperfect channel state information (CSI) between the secondary users and the primary user, and by the co-channel interference (CCI) at secondary relays and destination. We first obtain...
The work interests in the one-way multiple-access relaying channel (MARC), in which analog network coding (ANC) is employed. The one-way MARC relaying channel consists of two source nodes, one relay node, and one destination node, all of which work in half-duplex state. The two source nodes want to transmit information to destination node with the help of relay. For the scheme, the outage probabilities...
In order to realize the wireless access with big capacity and multi-user, 1x EV-DV was proposed by 3GPP2. However, according to our analysis of the CDMA-system capacity, we conclude that the technology of blinding channel and variable modulation, which is adopted in 1x EV-DV, are unreasonable and can not support high-speed data server. Base on these analyses, we propose a CDMD/TDMA reform scheme,...
Spectra of seven cloud lightning discharges are reported for the first time after captured with a Slit-less Spectrograph on Chinese Tibet Plateau. The structural characters are analyzed and compared with the spectra of cloud-to-ground lightning, and the results indicate that the spectra of cloud lightning show two different kinds of structure characteristics. One has the similar structure as those...
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