Aiming at the application of QAM modulation and demodulation technique in the mobile communication,this article introduces a kind of thought and method which uses VerilogHDL hardware description language to realize the design of backend design of 64QAM(Quadrature Amplitude Modulation)demodulator,based on the Altera Company of CPLD device and Microdevices Company of RF2713(monolithic integrated quadrature modulator/demodulator) device.This method has some expansibility and it is realized by EPM7128SLC8415.The QAM demodulation mode may be adapted to 256 demodulation mode by mending VerilogHDL program.
Collaborative design changed the traditional design method of amending system scheme, according to the comprehensive analysis about hardware/software function,and they are wellintegrated It makes the design processing more efficient, and makes the system work in the best state The hardware/software collaborative design technology is introduced in detail
Traditional Mass Storage is realized by PCI interface or EPP interface,their transmission are limited,they can not satisfy the mass and high speed transmission,and don′t support hot attach detach,plug and play,use is discommodiousness,USB 2.0 has a 480Mb/s,it supports hot attach detach,plug and play,SDRAM is the high speed storage which has high quality and low price.A design of mass storage based on USB 2.0 protocol and SDRAM is introduced.The CY7C68013 chip which is specially used for USB 2.0 and CPLD are used in this system.the mass and high speed transmission between SDRAM and computer or next circuit is realized.the max speed between slave FIFO and SDRAM can reach 96 MB/s when CY7C68013 works in slave FIFO.The mass storage has potential applications in the high speed signal process.
SVG is a XML application standard for describe graphics by vectors,and which is drafted by W3C.SVG has some advantages such as extensible,dynamic and interactive.SVG can support ability of handle complicated events,and it can be embedded into XHTML documents,form a full integrated and wellquality Web page.The concept and character of SVG are introduced.The document structure and basic shapes of SVG are described.In the end,the ways of embedded SVG file into XHTML,and a whole document example are given.
The equalizer changes channel in communication system.This paper researches a kind of self-adaptive equalizet based on minimum meansquare error and gives it′s flow chart,specialized test pulses are not used into the error adjustment,but deliver signal itself.Analyzing the superiority of the software realization methods.All of that above showed the methods presented in this paper are full of values in practice.
