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Simulation of QPSK in AWGN channel
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Digital modulation spectrum is to move the digital baseband signal to a high frequency, forming in the channel for the transmission of bandpass signals. Basic digital modulation with an amplitude shift keying (ASK), frequency shift keying (FSK), the absolute phase shift keying (PSK), relative (differential) phase shift keying (DPSK). At the receiving end can use non-coherent demodulation of the demodulated wanted to restore the digital baseband signal. Transmission of digital signals into baseband transmission and bandpass transmission. However, in practice most of the channel (as) radio channel has a wealth of low-frequency components. To enable transmission of digital signals in a communications channel in the band, the digital baseband signal must be modulated on a carrier, so that the characteristics of the signal to match the channel. Anti-noise performance of the communication system is the ability of the system to overcome the impact of additive noise. In digital communication s
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