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Independent component analysis (ICA) is a statistical technique where the goal is to represent a set of random variables as a linear transformation of statistically independent component variables. This paper proposes a new extended model for CT medical image de-noising, which is using independent component analysis and dynamic fuzzy theory. Firstly, a random matrix was produce to separate the CT...
This paper discussed the interference between 3G LTE random access preamble and the SRS (Sounding Reference Signal) via multi-UE link level simulations, analyzed the performance changes of two types of signal under the influence of interference and found out the factors which leading these changes, then we summarized the way of reducing the interference.
The orthogonal frequency division multiple access (OFDMA) is widely used for its characteristics of high data transmission rate and the flexibility of bandwidth allocation. In this paper, an equivalent SISO model for the MIMO STBC system was presented, and a Multi-user multirate adaptive sub-carrier allocation scheme was proposed also. We apply the algorithm to the OFDMA. The simulations results show...
OFDMA uplink synchronization for IEEE 802.16e is mainly accomplished by initial ranging, thus initial ranging which includes multiuser ranging code detection, multiuser timing offset and power estimation at the base station is one of the most important processes for TDD OFDMA systems. To overcome the existing ranging method's drawbacks namely high complexity, high probability of a false alarm and...
Cognitive radio has been considered as a promising paradigm to achieve efficient spectrum usage by allowing the coexistence of the primary and secondary networks. One fundamental challenge is to ensure the quality of service (QoS) of the primary link while maximizing the transmission rate of the secondary links. In this paper, we investigate cooperation based spectrum access at the secondary networks...
The present wireless communication system under coal mines is characterized by single pattern, fixed communication frequency, incapability of adaptive to various tunnel environments. To solve the above problems, cognitive radio (CR) is applied to the system. This paper focuses on the application of energy detection algorithms used in the spectrum sensing of various tunnels under mines. The detection...
Multipath routing which has great potential to improve network characteristics for mobile wireless networks is one of central problems nowadays. Since most of the proposed multipath algorithms are On-Demand based, they need extra feedback information that lead the delay to grow. In this paper, we propose a proactive Multipath Optimized Link State Routing Protocol (MOLSR) based on OLSR(Optimized Link...
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