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The high latency nature of mobile network limited the use of mobile cloud storage, especially for these applications with frequent random accesses to a large set of small files. Prefetching techniques are usually utilized to overcome the latency problem, but most existing prefetching algorithm cannot prefetch enough data to alleviate the negative effect of high latency in a random access sequence...
This paper presents a particle filter processor for mobile positioning systems. The proposed particle filter employs a selective sampling scheme to reduce the required iteration of particle filtering and improve positioning accuracy. Moreover, a threshold IMH resampling algorithm is also proposed to enhance the hardware utilization rate and processing latency. This study also designs and implements...
In recent years, research on mobile positioning techniques in wireless communications systems attracts a lot of interest due to the growing use of location-based applications for smart phones. This research proposes a code-aided received signal strength (RSS) estimator for a network-based positioning system. The proposed RSS estimator derives the channel noise by accumulating the minimum path metrics...
Mobile positioning in the cellular systems usually suffers great performance degradation caused by the non-light-of-sight (NLOS) effect in the urban area. Thus, this work proposes a novel virtual base-station transform (VBST) algorithm based on the particle filter and convex optimization. The proposed algorithm can virtually move the base stations to the light-of-sight (LOS) positions to the mobile...
Under mobile environment, the third part trusted may not be reached at any time. Moreover, there exist attacks on overall performance and availability of mobile networks caused by deceit of legal users and compromised platforms. In this paper, trust model composed of identity authentication, platform integrity attestation and user behavior evaluation is raised for network mobility (NEMO). Where, identity...
In this paper, we propose a VLSI design of a 4 × 4 MIMO-OFDMA down-link baseband receiver for the mobile communications. The receiver consists of synchronization, channel estimation/compensation, precode codebook search, and MIMO detection. To realize the closed-loop MIMO system in the mobile environment, we utilize the MMSE-OSIC algorithm for MIMO detector and capacity selection criterion for precode...
In the MIMO-OFDM system, QR-based MIMO detection suffers from high computational complexity of the QR decomposition due to the large numbers of antennas and subcarriers. Thus, interpolation-based QR decomposition was proposed to reduce the complexity. In this paper, we present a scalable interpolation-based QR decomposition algorithm for the grouped-ordering interpolation scheme. The proposed algorithm...
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