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The following topics are dealt with: VLSI; OFDM; embedded systems; filters; MIMO; cellular and integrated systems; media processing; Internet; image processing; network routing; QoS and resource allocation; network management; channel modelling and equalization; ad hoc networks; communication signal processing; WSN; channel estimation; WLAN and WWAN; coding and detection; security; UWB; cognitive...
For a multi-user orthogonal frequency division multiplexing (OFDM) system, system reliability, availability and fairness should be guaranteed simultaneously. Resource allocation problem for such systems can be described as maximizing overall throughput while satisfying requirement of fairness, subject to power restriction and quality of service (QoS) requirement. Existing researches provide solution...
This paper presents a new scheme for MIMO-OFDMA (multiple input multiple output-orthogonal frequency division multiple access) downlink resource allocation. This scheme intends to simultaneously enhance capacity and proportional rate fairness among users. A suboptimal power allocation method is also described in detail in this paper. The system objective is to maximize the total capacity subject to...
Users of IP-based services need mobility support and guaranteed quality of service while using multimedia application. MIP introduced by IETF supports IP mobility at network layer. MIP however uses triangle routing, which can be considered a traffic engineering issue. The result of constant routing of packets destined to the mobile node via its home agent creates traffic congestion at this node. On...
Resources in grid system are common facilities for which numerous users compete, while the competition is no longer restricted in single type of resource but combination of various type and amount of resources. Economic model has been argued as an effective way to establish genuine and rational mechanism for resource configuration, fit for resolving problems of resource management and allocation in...
This paper puts forward two novel user-grouping algorithms for grouped MC-CDMA systems. The adaptive assignment for user-grouping plays an important role for link quality. We formulate the capacity-maximizing problem of user-grouping and analysis the optimal criterion for it. The derived optimal criterion has a similar form with signal to noise plus interference (SINR), with unassigned power included...
Modern search engines with arrays of parallel servers can provide efficient Web information retrieval. However, as the returned results are usually enormous mass, finding target information is still time-consuming. To increase the correctness of returned results, different page ranking methods have been introduced. They waited and passively weighted users' feedback in page ranking to try to improve...
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