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In current multi-hop relay networks (MRNs), normally the communication path is not optimized, especially when two mobile stations (MSs) attached to the same relay station (RS) need to communicate with each other. In this paper, a novel data transmission scheme: administrable and controllable local forwarding for OFDMA-TDD based two-hop relay cellular networks, is proposed. In the local forwarding mode, data transmission between two MSs attached to the same RS is forwarded without necessarily being sent to the base station (BS). Thereby the spectral efficiency is improved. And then two cost based relay selection schemes (RSSs) are proposed for the efficient usage of local forwarding mode. The first is a modified traditional RSS (RSS-MT), which implements local forwarding after relay selection. And the second is a local forwarding-based RSS (RSS-LF), which takes the advantages of the local forwarding into account during relay selection. Numerical and simulation results show that the local forwarding transmission schemes can improve the system capacity greatly. Moreover, the performance of RSS-LF is shown to be superior to that of RSS-MT.

Good use of embedded Linux open, portability features, wireless control systems for mobile robots to build; while the dynamic model of the mobile robot kinematics model and analyze and track their trajectory control methods studied, BP-PID trajectory tracking control algorithm. Research results show that the wireless control system built with the design requirements, the use of the control algorithm is effective and reliable.

Transmission line intelligent distribution and management system is the latest systematic product for optical network intelligent distribution, with the function of detecting, warning and information processing, whose purpose is to realize the delicacy management of transmission line resources and solve the problems appearing in the process of using resource management system., such as input complexity, function singleness and so on. The thesis introduces different functions of each module in this system, puts forward the solutions to this systematic function and provides some realization codes.