and a few module of quasi random code modulation signal and a radar signal processing module which can extract the information of velocity and range are carried on . the result can be applied on radar systems 接下來實現(xiàn)了幾種偽隨機碼調(diào)制信號的模塊以及提取速度距離信息的雷達信號處理模塊,成果可用于實際的雷達系統(tǒng)。
narrowband watermarking information is spread into wideband pseudo-random code before being embedded by modifying the scale of the distance between vertexes in two-dimensional engineering graphics 該方案先將待嵌入的窄頻帶的浮水印信號擴頻為寬頻帶的偽隨機序列,然后再以偽隨機序列為依據(jù)對二維工程圖中直線實體的長度作相應(yīng)的修改。
and during the course of the particular implement, i mainly resolved the problems of the random code and pagination etc . first, i introduce the basic knowledge of the wap, and the difference with the http that we are familiar to 并在具體實現(xiàn)中重點解決了亂碼、分頁等問題。首先,介紹了wap協(xié)議的基礎(chǔ)知識,以及與我們所熟悉的http協(xié)議的區(qū)別。
after that, it discusses the capture and tailing method for the false random code spreading code, including correlation and non-correlation method . between the two method, the correlation method is fit for the wireless communication 接下來討論了偽隨機擴頻碼的捕獲和跟蹤方法,包括相干的方法和非相干的方法,其中非相干的方法更適合用于無線通信中。
turbo code, which utilizes the condition of random coding and decoding of shannon noisy channel coding theorem, has obtained the performance near to shannon theoretic limit . the performance of turbo code is the best one in all presented coding methods turbo碼由于很好地應(yīng)用了shannon有噪信道編碼定理中的隨機性編譯碼條件而獲得了接近shannon理論極限的譯碼性能。