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The paper is based on the knowledge and relevant literature that the author learned during the internship in the TD Technology Forum (Beijing). With the aid of expertise, firstly, the author analyzes China mobile communication market taking 2G and 3G as background. Secondly, introduces the development of E-Commerce in various stages of circumstances. Finally, comes up with solutions that can help...
In this paper, we focus on the downlink performance of a multi-user distributed wireless communication system(DWCS). The power consumption of each network-side antenna element is investigated. Without loss of insights, the single antenna mobile terminals are considered, and a simple antenna selection scheme is adopted, based on which each mobile terminal is served by only the network-side antenna...
In order to improve the transmission performance in inter-symbol interference channel, a controlled inter-symbol overlapping transmission scheme to obtain high frequency efficiency, which is called inter-symbol overlapping transmission (ISOT), is studied. ISOT allows K symbols to be simultaneously transmitted without increasing channel bandwidth, and the symbol transmission interval can be decreased...
With the multitude of mobile communication devices supporting users, it is natural to expect that these devices would work ubiquitously anywhere and any time with high data rate support. 60 GHz is an obvious choice for the high data rate indoor communication. In this paper we present an holistic analytical model of 60 GHz link stability for indoor wireless networks. The model is built considering...
Mobile element has been proposed to assist data collection or data relay in wireless sensor networks, since it is able to either significantly save energy consumption or reach disconnected nodes due to the limited radio range. Trajectory of the mobile elements play an important role in avoiding buffer overflow of sensor nodes. In this paper, we propose optimization problems for mobile elements in...
With the increase in the capacity of mobile communication devices, it is but natural to expect that these devices would work ubiquitously anywhere anytime to offer high data rate support. Recently 60 GHz frequency band has been identified as an obvious choice for the high data rate indoor communications. However, as the 60 GHz radio system relies on line-of-sight (LOS) transmission for achieving Gbps...
In this paper, the uplink of a multi-user distributed antenna system (DAS) with antennas deployed on a circle is investigated. The optimal radius to deploy antennas is studied with the target of sum capacity maximization. Adopting random matrix theory, a good approximation of the per-user sum capacity is derived. We also present a numerical method to calculate the unknown parameters in the approximation...
With the development of wireless communication system, long-range precise channel prediction is considered to be more important. Traditional predictors require a lot of pilots and their performances degrade very fast after the correlation time, especially in high speed mobile environment. A new parametric channel predictor, CPREI, which is based on the auxiliary environment information, is presented...
In this paper, multi-user distributed antenna systems (DAS) with antennas deployed in clusters are studied. In order to investigate the impact of the size of antenna cluster on the system performance, the mean square access distance (MSAD), which is a function of the size of antenna cluster, is defined as a metric of the system performance. From the analysis of the asymptotic behavior of the metric,...
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