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Sparse code multiple access (SCMA) is a competitive nonorthogonal access scheme for the next mobile communication. As a multiuser sharing system, SCMA adopts message passing algorithm (MPA) for decoding scheme in receiver, but its iterative method leads to high computational complexity. Therefore, a serial message passing algorithm based on variable node (VMPA) is proposed in this paper. Making some...
Modeling MIMO time-variant channels as real world of wave propagation environments dictates, becomes crucial in wireless communication where an accurate knowledge about the channel state information is expected to be available for the transceivers. However instead of having unreliable and inefficiency instantaneous channel state information (CSI) where the feedback mechanisms often generate a delay...
In recent years, Optimized Link State Routing (OLSR) protocol receives widespread attention due to its relatively less routing overheads and good routing performance. Since the mobility of nodes and flexibility of the topology are the principal features of ad hoc network, it is necessary to study the impact of these features on the performance of the network. In this paper, we propose a novel scheme...
OBS (Optical Burst Switch) network is a promising network. In our study, a new Adaptive Proportional Distribution Scheme is adopted as the route algorithm of OBS network, to improve the network performance. It splits traffic from the source node among the several candidate paths with special proportion to finish transmission. And GMPLS protocol is used herein to set up the paths. The main idea of...
In this paper, a novel data burst assembly algorithm which based on control channel availability and traffic type is presented. In this mechanism, a burst is created only if its control packet can be transmitted and can be packed as different length according to traffic type to adapt the network requirement best dynamically. The variable Lstep which defined as the variation of the size threshold,...
An adaptive radio resource allocation strategy for GPRS/EDGE system is proposed in this paper, which is the optimal smooth transition solution from 2G towards 3G. The proposed long-term allocation mechanism and short-term channel sharing mechanism can improve resource utilization by configuring channels effectively for both voice and data traffic. In addition a statistical model is introduced to estimate...
Reduced throughput of TCP over WLAN is mainly due to traditional TCP protocols treat all packet loss as a sign of congestion, their inability to recognize non-congestion related packet loss has significant effects on the communication efficiency in the wireless networks. But highly variable round-trip times (RTT) in wireless networks can induce spurious timeouts, thus unnecessarily degrading throughput...
J2ME is one of the most prevalent technologies of wireless application development. A mobile bus rooting information query system based on J2ME was proposed in this article. Servlet program was designed to processing query requests from the client and send the result back. On this system, people can get the information they need conveniently just using the existing mobile Communication network.
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