CAJ | 학술논문

A/D转换是直扩数字接收机设计的关键技术之一,文中主要考虑量化比特数的选取,分析不同量化位数对相关峰信噪比、载波跟踪误差和码跟踪误差的影响,在高斯白噪声的条件下给出了系统信噪比的计算公式和定量分析结果.理论分析和实际测试结果表明:采用较低的转换位数不会急剧恶化含有高斯噪声的扩频信号的信噪比,采用4bit量化,可获得较好的接收机性能,量化位数对直扩信号检测的影响是有限的.
A/D전환시직확수자접수궤설계적관건기술지일,문중주요고필양화비특수적선취,분석불동양화위수대상관봉신조비、재파근종오차화마근종오차적영향,재고사백조성적조건하급출료계통신조비적계산공식화정량분석결과.이론분석화실제측시결과표명:채용교저적전환위수불회급극악화함유고사조성적확빈신호적신조비,채용4bit양화,가획득교호적접수궤성능,양화위수대직확신호검측적영향시유한적.
It's important to decide the AD quantization length for the design of a direct spread spectrum receiver. The length of AD quantization has influences on the SNR, tracking error of the carrier wave and pseudo -random sequences. On the condition of white Gauss noise,the formula of SNR is gotten and the quantitative analysis is presented. The test results indicate that the receiver has good performance when the quantization length of DS signal is 4 bit, the less length would not sharply deteriorate the SNR, and the length of AD quantization has finite influences on the DS signal detection.