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Ding S.,Guangdong University of Technology | Li J.,Telecommunications Co. | Xiao H.,Telecommunications Co. | Huang H.,South China University of Technology
Proceedings - 9th International Conference on Computational Intelligence and Security, CIS 2013 | Year: 2013

In this paper, we propose reliability adjustment weighted bit-flipping (RA-WBF) decoding algorithm for low density parity-check (LDPC) codes. By adjusting the reliability of received symbols during iterative decoding, the proposed algorithm can offer better tradeoff between performance, convergence speed and computational complexity. Furthermore, this improvement can easily be extended to other variations of weighted bit-flipping decoding algorithm and obtain noticeable improvement in error performance. Simulation results are shown to verify our conclusions. © 2013 IEEE. Source

Mai W.,Guangdong University of Technology | Liu H.-L.,Guangdong University of Technology | Chen L.,Guangdong University of Technology | Li J.,Telecommunications Co. | Xiao H.,Telecommunications Co.
Proceedings - 9th International Conference on Computational Intelligence and Security, CIS 2013 | Year: 2013

Planning of base stations (BS) is one of the fundamental problems in the fourth generation (4G) wireless network design. A new mathematical model for the 4G BS planning is proposed in this paper. The co-channel interference, orthogonal frequency division multiplexing (OFDM), the cell edge rate, the reference signal received power (RSRP) and the base station density are considered in detail in this model. The objectives of the model are to minimum construction cost, maximum coverage and capacity at the same time. It's a multiobjective optimization problem with constraints. So a multiobjective algorithm with a local search operator is designed to solve this model. Simulation results show that the according algorithm with local search operator can give a set of solutions with relatively lower cost, larger coverage, larger capacity and faster speed than the algorithm without local search operator. The effective and efficient of the proposed model can also be identified by the comparison of the solutions. © 2013 IEEE. Source

Guo Y.,Telecommunications Co. | Hui W.,Telecommunications Co.
Advanced Materials Research | Year: 2011

Data center develops rapidly in recent years. With the emergence of new equipment and technology, data center network encounters many problems. Fat tree model is proposed and solves some problems. However it has some drawbacks. Based on the previous studies and current technology this article improves and proposes an amendment model which is higher availability and more efficient for actual situation. © (2011) Trans Tech Publications, Switzerland. Source

Kazama J.,Telecommunications Co. | Nagao T.,Telecommunications Co. | Yabe F.,Telecommunications Co. | Mishima S.,Telecommunications Co. | And 6 more authors.
Furukawa Review | Year: 2010

As the transmission volume of information increases in the 2000s, wavelength multiplexing in optical communications has been implemented along with the upgrading of the communication speed. Such advancement has made optical fiber fusion splicers one of the essential industrial equipment for the implementation of the communication networks and the manufacturing of optical components. Also, in the non-communication fields present in sensing technology using strains in optical fibers and laser technology for power transmission, the use of optical fiber is rapidly growing. The fusion splicers are used in these non-communication fields as well. In light of this, we have been developing new fusion splicers with sufficient performance and functions to meet requirements from the special market segments in response to customers' needs. Simultaneously, we have been developing new products that provide superior robustness required from all market segments. Recently we have developed, around the same time, seven models of fusion splicers in three series - namely S123, S153 and S178 in addition to our mainstay product of direct core monitoring type. We have thus been successful servicing all of our customers in the different segments by providing them with a range of applications with a state-of-the-art technology of Furukawa Electric. Source

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