do symbol meaning in Chinese

执行符号

In this paper , research on the algorithm of complete digital if and baseband transmission system and the realization of transmitter and receiver . / 4 - dqpsk is chosen as digital modulation scheme . the scheme of demodulation is baseband differential detection . sliding correlator can realize the symbol synchronous acquisition ; early - late gate synchronizer is used to do symbol synchronous tracking
系统的发射机选定/ 4 - dqpsk为调制方式,接收机采用基带差分解调的非相干解调方式,滑动相关器捕获发送的pn序列,早迟门同步器跟踪符号同步,使用相关器对同步后的符号进行最佳判决,并在这些算法实现的基础上,实现了直接序列扩频和解扩技术。