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This paper proposes a new approach to construct quasi-cyclic low-density parity-check (QC-LDPC) codes of girth 8. The proposed codes are based on a bipartite graph called Moore graph. By decomposing the bit nodes of the bipartite graph, the proposed QC-LDPC codes have variable code lengths and rates. Simulation results show that the proposed QC-LDPC codes have good performance with an iterative decoding...
Product replacement gives a simple approach for code construction. This paper investigates the use of replacement product graphs for the recursive construction of QC cycle LDPC codes. It is proved that the QC cycle LDPC codes constructed by our approach are of girth 6. Simulation results show that QC cycle LDPC codes constructed by the replacement product perform well over the AWGN channel.
This paper is a study of staff issues at the bank, ICBC China. Due to extra and imbalanced staff, the system was idle most of the time. By using the qualitative approach, M/M/s queuing model and discrete event simulation, the staff was sub-optimized. First, observation of the system was conducted and recorded using the existing operations system used by the bank. Arrival time of customers, service...
A BLDCM's PID controller and its system simulation are investigated in this paper. At first, the mathematics model of the motor control system is established, so that the system simulation is carried out respectively. And then, a PID controller is used to control the speeds between the two BLDCM, and the sine wave and triangle wave are selected to validate the effect of simulation. Finally, through...
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