| 摘要: |
| 对基于Hadamard矩阵的LA码和基于劳伦多项式（Laurent Polynomial）的LS码的生成
及相关特性进行研究，从占空比、相关特性、零干扰窗长度、码字总数等方面仿真分析了LA
S码的性能，并结合实际应用，理论分析了LAS-CDMA系统与传统CDMA系统的归一化容量，仿
真比较了LAS码和Gold序列在准同步CDMA系统中的误码性能。仿真和理论分析表明：LAS码具
有均匀的零干扰窗（Interference Free Window，IFW）特性；不同主码的互相关函数IFW附
近存在较小的副峰，多址干扰较小；在准同步移动通信系统中，LAS-CDMA抗多址干扰性能
明显优于传统CDMA系统，使用 LAS码比使用Gold序列有更好的误码性能。 |
| 关键词: LAS-CDMA系统 Hadamard矩阵 劳伦多项式 LAS码 零干扰窗 归一化系统容量 误码性能 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目（61032004，60972062） |
|
| Construction and performance analysis of large area synchronous code based on Laurent polynomial |
| LI Fei-long,LI Zhi-qiang,FENG Shao-dong,DONG Fei-hong,WANG Fan |
| () |
| Abstract: |
| Large area code(LAS) based on Hadamard Matrix and large loosely code based
on Laurent Polynomial are firstly discussed, then the performance of LAS code i
s analysed, including duty ratio, correlation properties, the length of Interfer
ence Free Window(IFW) and
total number. The normalized system capacity in LAS-CDMA system and traditional
CDMA system is given by theoretical analysis, subsequently the BER performance
of the LAS code and Gold code in quasi-synchronous CDMA systems is simulated.
The simulations show that the LAS code has the characteristics of uniform IFW. Th
e multiple access interference is smaller for the LAS code with different LA cod
e. LAS-CDMA has advantages on normalized system capacity system over traditional CDMA system and BER performance is significantly better than that of application of Gold code. |
| Key words: LAS-CDMA system Hadamard matrix Laurent polynomial LAS code interference free window normalized system capacity BER performance |
