摘要
量化比特数的确定是IF数字接收机设计的关键。从高斯分布函数的角度,得到了不同量化比特数和量化电平下直扩系统的输出信噪比计算公式;对存在窄带干扰情况下AD量化比特数的确定给出了定量的分析。计算机仿真结果表明:无干扰时取4bit量化即可获得较好的接收机性能:于信比为24dB时,量化比特数应至少为6bit。
It's important to decide the necessary quantization length for design of a direct spread spectrum digital receiver. From the point view of the pdf of Gaussian r.v., the output SNR of direct spread spectrum system for different AD quantization length and maximum level is obtained. For the same instance on presence of narrowband interference, the quantitative analysis is presented. The result of computer simulation is that the quantization length of DS signal should be 4 without jammer and should not be less than 6 when JSR is 24dB.
出处
《通信学报》
EI
CSCD
北大核心
2004年第8期124-128,共5页
Journal on Communications
关键词
量化比特数
最大量化电平
单音干扰
quantization length
maximum quantization level
single-tone jammer
