基于复合序列的多进制正交扩频系统性能分析  

Performances of M-ary orthogonal code spread spectrum system based on composite sequences

作　　者：付江志[1] 郭黎利[1] 杨红乔[2] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001 [2]中国空间技术研究院卫星应用系统部,北京100086

出　　处：《系统工程与电子技术》2010年第4期703-706,共4页Systems Engineering and Electronics

摘　　要：提出了一种可用于高速数据传输的多进制正交扩频系统的设计方法。该方法将复合序列与多进制正交扩频技术相结合,在原有多进制扩频系统规模的基础上可实现更高的传输效率,或者在信息速率一致的情况下大大降低系统结构。对在加性高斯白噪声(additive white Gaussian noise,AWGN)信道中的性能进行了仿真,结果说明,在系统结构相近的情况下,不仅传输效率提高了17%,而且在低误比特率时抗噪声性能提高0.1 dB;或者,在同样传送6 bit信息时,虽然系统的抗噪声性能在低误比特率时下降了1 dB,但复杂度仅为原来的25%。This paper introduces a design method of M-ary orthogonal code spread spectrum system applied to high-speed data transmission.The method brings about a higher bits rate based on a primary framework or reduces greatly system sizes in the same bits rate comparing with the conventional M-ary orthogonal code spread spectrum system by combining composite sequences with M-ary orthogonal code spread spectrum technology.The performances of the system in an AWGN channel are simulated.Simulation results show that when the structures are similar,bits transmittable efficiency improves by 17% and the antinoise capability increases by 0.1 dB at low BER.On the other hand,when 6 bits are transferred,the antinoise capability decreases by 1 dB at low BER,but the system complexity reduces by 75% as compared with the original one.

关 键 词：通信技术 多进制正交扩频 软判决 复合序列 传输效率 

分 类 号：TN914.4[电子电信—通信与信息系统]