自編碼擴頻和直接序列擴頻的性能比較

基于自編碼擴頻在傳輸數(shù)字信息時能實現(xiàn)擴頻碼動態(tài)可變的現(xiàn)象，討論了自編碼擴頻的原理、傳輸特性，引入等效擴頻增益描述其性能變化，并針對自干擾現(xiàn)象提出了改進方法。通過分析和仿真表明，雖然自編碼擴頻的增益與經(jīng)典擴頻實際上相同，但是通信的隱蔽性得到了改進。
關(guān) 鍵 詞 擴頻通信; 偽隨機序列; 自編碼擴頻; 直接序列擴頻

Abstract Self-encoded spread spectrum(SESS) system employs random spreading sequences extracted from the information date to assure dynamically random varying. Performance analysis of self-encoded spread spectrum in additive white Gaussian noise channels is presented. An equivalent spread spectrum gain is used to describe the characteristic of self-encoded direct sequence spread spectrum system. Improved approaches generating self-encoded spread spectrum sequences are introduced. Theoretical analysis and computer simulation show that the spread spectrum gain of self-encoded direct sequence spread spectum system is almost the same to conventional spread spectrum system, but private of self-encoded direct sequence spread spectum system increases with variability of spread spectrum codes.
Key words spread spectrum communication; pseudo-noise sequence; self-encoded spread spectrum; direct sequence spread spectrum