Punctured convolutional coding with an 8, 16 and 32 differential amplitude and phase shift keying ( DAPSK ) modulation is considered. 研究带删除卷积码的8、16、32差分幅/相移键控(DAPSK)调制。
In order to make the limited spectrum range accommodate more communication channels, some linear modulation techniques are proposed, such as QAM ( Quadrature Amplitude Modulation ), QPSK ( Quadrature Phase Shift Keying ), etc. 为了让有限的频谱范围能够容纳更多的通信信道,人们提出了一些线性调制技术,如:QAM(quadratureamplitudemodulation)、QPSK(quadraturephaseshiftkeying)等。
At present, many researches about all-optical wavelength converters only based on the signal modulation formats of binary amplitude shift keying ( OOK ) and differential phase shift keying ( DPSK ), but it is very few to the signal modulation format of polarization shift keying ( PolSK ). 目前,全光波长转换器的研究主要集中在二进制振幅键控(OOK)和差分移相键控(DPSK)信号调制格式,对于偏振移位键控(PolSK)信号调制格式全光波长转换的研究很少。
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 ). 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。