OFDM (Orthogonal Frequency Division Multiplexing) is a hot research in high-speed wireless communication field.OFDM modulation put the serial data flow into several parallel data flow, transmission on the orthogonal sub-carrier, has advantages as following: Resist multi-path fading, high spectrum efficiency, suitable for high speed data transmission and so on. It is wildly used on asymmetric digital subscriber loop, ETSI standards audio broadcast, digital video broadcast, High-definition digital TV, wireless LAN fields and so on. This paper introduces the OFDM theory, and implementation the OFDM transmission system based on the FPGA technology.
Student is the subject of the experimental teaching activities, cultivating the ability of independent study and technological innovation is the main aspect in experimental teaching reform. This paper analyzed the problems of traditional teaching model, explored and practiced the multilevel experimental teaching pattern which is based on the blended learning, it made the teachers fully play the leading role, and it fully reflected the subject status of students, it also roused the enthusiasm of students by the use of multi-platforms, media and environments. The multilevel experimental teaching pattern which is based on the blended learning can effectively cultivate the innovation ability of students, and it has achieved good results in practice.
This paper direct to security and real-time requirements in high-speed network transmission processing, based on SOPC technology, design a High throughput AES encryption/ decryption processing unit with pipelining. The design goal is to optimize the hardware structure and improve the throughput, S-box design and parallel processing structure. Compared with traditional AES crypto-chip has faster rate with encryption and less consumption of resources advantages. This design adopts VHDL hardware description language, use Quartus II 8.0 for the synthesis and routing, and this processing unit is packaged an independent IP core, attached to the Altera provided the Nios II system, finally download and test validation on the DE2 development platform.
Learning ability of students and Technological innovation ability are important part of the deepening the reform of experimental teaching. Traditional "closed, verify that the type-based" teaching experiment seriously hinder the learning ability of students and technology innovation. In this paper, direct to problem in traditional teaching mode, explore and practice "Three Center Three Level", The experimental teaching model is from "closed teaching " to "open teaching ", teaching content is from the "verify the theory-based" to "problem-based inquiry", "Three Center and Three Level" teaching system results achieve good results.
This paper designed an OFDM baseband signal transmission system, which adopted CORDIC algorithm, pipeline organization and high-speed floating-point butterfly unit to complete the customized FFT Processor, and the modulation of the signal was realized by enhancing modulation mode (64-QAM) in the adaptive modulation mode. Meanwhile, due to FPGA technology is reconfigurable and parallel, the signal has a higher transmission rate. The system used FPGA resources reasonably and integrated highly, simplifying the complexity of the system; eventually it was adapted to the EP2C35F672C6 chip of Altera, and can be normally operated in the clock frequency of 100 MHz; At the same time, this system the system has high flexibility and generality, simple structure, and good clutter suppression, so it has a certain application prospects.
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