针对二进制相移键控调制的二维扩频系统，分析了其抗单音干扰的性能。
The current analysis focuses on the performance of BPSK modulation on 2-dimensional spread spectrum system with single-tone jamming.
第三，对采用不同调制格式（包括幅移键控和二进制相移键控）的光副载波复用（OSCM）系统中，PMD引起的功率代价进行了量化。
Thirdly, we quantify the power penalty caused by the PMD in optical subcarrier multiplexing (OSCM) system with amplitude shift keying (ASK) and binary phase shift keying (BPSK).
设计出了二次调制系统：采用连续可变斜率增量调制（ CV SD）实现模拟话音信号与数字编码的转换，采用二进制相对相移键控（2 DPSK）作为数字调制方式。
A twice modulation is designed:, CVSD was adopted to realize conversion between analog and digital voice signals, 2DPSK was used as the digital modulation mode.
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