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—For the limitation of the network resources, to support real-time service in Mobile Ad Hoc Networks is challenging, especially for the delay sensitive voice sessions. Firstly, the delay spike phenomenon is described and analyzed in detail in this paper. Then, to alleviate its impairment on the voice quality, based on the prediction of delay spikes, a new(More)
The codebook based precoding is a promising technology adopted by Long Term Evolution (LTE), which fixes a common codebook comprising a set of vectors and matrices at both the transmitter and the receiver. For the codebook design, it is necessary to achieve high precoding gain, lower feedback overhead and flexibility to support various antenna(More)
—The accuracy of global positioning system (GPS) based point determination in urban environment is mainly corrupted by multipath and signal diffraction. The measured carrier-to-noise-power-density ratio (C/N 0) has proven to be an excellent tool for the estimation of the random errors of the observables. In this paper, a novel weight model which is(More)
This paper introduces two kinds of handover algorithms that adjust the handover (HO) parameters of LTE (Long-Term Evolution) eNodeB (evolved NodeB) to improve the overall network performance and diminish negative effects. The focus is on the impact that two kinds of handover algorithms compare to A3 event based on the optimization of hysteresis and(More)
To improve the performance of spectrum sensing in cognitive radio (CR) network consisting of primary user (PU), secondary user (SU) and fusion center, a cooperative spectrum sensing scheme based on artificial neural network (ANN) is designed. ANN is introduced at every SU to forecast the probability which represents the effect of local sensing. Fusion(More)
In order to reduce time to first fix (TTFF) and improve the robustness of location, assisted global positioning system (AGPS) is used. In this paper, positioning algorithm in this system is designed and its precision based on real data measured is analyzed. Pseudo range is calculated using fuzzy border disposal through flow structure of AGPS and the data(More)