QPSK receiver and transmitter production: In order to effectively transmit digital signals, most of them now use digital modulation to process digital signals. The basic digital modulation methods include amplitude shift key (ASK), frequency shift key (FSK) and phase shift key (PSK). This topic uses QPSK (quadrature phase shift key) in the PSK method. This transmission method is currently being widely used (cable moden, satellite broadcasting...). Its advantages: high modulation efficiency, low signal-to-noise ratio required for the transmission path, suitable for satellite broadcasting.
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