Zou Decai

Implementation of MB-OFDM Transmitter Baseband Based on FPGA

Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) is a suitable solution to implementation of high speed data transmission in ultra wideband spectrum by dividing the spectrum available into multiple bands. The baseband of transmitter is one of the most important parts in MB-OFDM system. The structure of MB-OFDM system transmitter is introduced in this paper and the design of transmitter baseband based on FPGA is described in detail. The design has been validated with Xilinx Virtex II FPGA. The results show that all modules designed has achieved the expected purpose both in precision and resource, with simplicity and high efficiency, and can meet the demand of MB-OFDM systems.

Application of data fusion in multi-sensor integrated navigation system

Integrated navigation system can help to solve the performance and application problems and limitations of the navigation equipment. Data fusion technology is one of the kernel parts in integrated navigation systems. In this paper, the current advances of this technology are introduced, with the architecture of a multi-sensor navigation system given and its principles and structure presented in detail. The emphasis is laid on the discussion of the algorithms of state estimation, track association and track fusion, on the basis of which the simulation results are given. The simulation results show that targets can be tracked well and the efficiency and accuracy of the information can be enhanced by using multi-sensor data fusion technology.

Implementation of convolutional code based on FPGA in OFDM-UWB system

The convolutional code cell is an essential part in a transmitter of multi-band orthogonal frequency division multiplexing ultra wide band (MB-OFDM-UWB) system introduced in this paper as a kind of useful channel coding to offer more protection against all kinds of channel noise under indoor channel environments. In this paper, some kinds of convolutional codes for MB-OFDM-UWB system are designed. And then, two different structures for the implementations of convolutional codes are presented respectively. The two different structures of convolutional codes are implemented based on field programmable gate array (FPGA) chip with the software tools of ISE foundation and modelsim. The simulation results show that the performance of parallel structure is better than that of pipe line structure and that its convenient to implement based on a mother code rate of 1/3 the punctured convolutional code with different code rates that are needed by different modules of the OFDM-UWB system. The implementation of convolutional code technique with FPGA chip can be fit to all kinds of applications of OFDM-UWB system with no transformations.