通信课程设计，直扩码的BER-SNR分析，dsss和bpsk调制，包括发送端与接收端，不同的码长在awgn信道下的性能分析。-Communication curriculum design, the DS code BER-SNR analysis, the DSSS, and bpsk modulation, including the sending end and receiving end, the performance of different code length in awgn