摘要
现今,m序列通常用线性反馈移位寄存器(LFSR)来产生,但产生的序列单一,且其串行的产生方式使得序列的产生速率随码序列周期的增大而成线性增大的趋势。文章分析了线性反馈寄存器的特征多项式,在电路中加入寄存器组,提出了一种改进型线性反馈移位寄存器结构。改进后的电路实现各级寄存器并行输出数据,克服了传统线性反馈移位寄存器产生m序列的速度受字长制约的限制,且电路可以重构特征多项式的系数因子产生多种序列。最后,以周期为15的m序列为例对电路进行了仿真和验证,实验结果表明序列产生速率提高了N/2倍(N为寄存器级数)。
Nowadays, m sequence is usually generated by hnear feedback shift register, but the produced sequence has a single modality and due to the serial production method it＇s production rate will increase N times with the sequence cycle increasing N times.In this paper, a register group adds to the improved linear feedback shift register structure based on the analyzing the characteristics of the linear feedback register polynomial. These Registers at all levels in the improved circuit adopts a parallel output mechanism which solves the problem that m sequence generated speed is limited by the word length in the traditional linear feedback shift register.This circuit can produce a variety of sequence through reconfiguring the polynomial coefficient factors.Finally.The author takes 15 cycles of m sequence as an example to the simulation and verification of the circuit, The results show that sequence production rate has increased N （Register series） times.
出处
《电脑与信息技术》
2009年第2期9-12,共4页
Computer and Information Technology
关键词
M序列
线性反馈移位寄存器
吞吐率
扩频通信
m sequence
linear feedback shift register
throughput
spread-spectrum communication
