零址碼 的英文怎麼說
中文拼音 [língzhǐmǎ]
零址碼
英文
zero address code-
The core of the proposed new cdma system is the use of orthogonal complete complementary codes, whose autocorrelation function is zero for all even and odd shifts except the zero shift and, whose crosscorrelation function is zero for all possible shifts
在本系統中，利用完全互補碼處處為零的互相關特性和自相關的旁瓣為零的特性，可有效消除系統的多址干擾，提高系統的容量。In this thesis, the zero correlation zone ( zcz ) or generalized orthogonal ( go ) sequences are applied to direct - sequence cdma ( ds - cdma ) systems, and the corresponding system performance are analysed. topics on the correlation property analysis of hadamard walsh ( wh ) sequences, go sequences, and loosely synchronous ( ls ) sequences are performed, and the system model and performance evaluation of single - cell and multi - cell synchronous cdma ( s - cdma ) systems employing go sequences, and the applications of go sequences in quasi - synchronous cdma ( qs - cdma ) systems are elaborated
本文研究了零相關區（ zcz ）或廣義正交（ go ）序列在直接序列碼分多址（ ds - cdma ）系統中的應用並給出了系統性能分析結果，包括hadamardwalsh （ wh ）序列集、廣義正交序列集與鬆散同步（ ls ）序列集相關特性分析，採用廣義正交序列的單小區與多小區同步cdma （ s - cdma ）系統模型與性能分析，以及廣義正交序列在準同步cdma （ qs - cdma ）系統中的應用等問題。The require of address code in project is that the sequence has acuity auto - correlation and the cross - correlation is near to zero
由於工程上對地址碼的要求是必須具有尖銳的自相關函數，而互相關函數接近於零。Cdma has become the main technology of the third generation mobiletelecommunication. many users in cdma system are distinguished by differentspread sequences and have the same time chip and frequency unlike in theconventional tdma system or fdma system. but the practical spread sequences cannot reach the ideal condition, the correlation function equals zero, so that it will causethe multiple access interference ( mai ) when lots of people are communicating. multi - user detection ( mud ) makes joint detection on the received signals by makingfull use of the information of all users ’, which relaxes mai and increases the capacityof system
Cdma技術已經成為第三代移動通信系統中的主流技術，它與傳統的fdma 、 tdma不同，在cdma系統中多個用戶均佔用同一時隙、同一頻隙，所不同的是選取的地址碼不同，而實際選用的地址碼間的互相關函數又不可能全部達到理想狀態的全為零，因而造成了多個用戶同時通信時，必然要產生多址干擾。分享友人