Chapter 8 Communication Systems 58.2. 1 Synchronous Demodulation O Complex Exponential Carrier ∞→·y() Communication( LPF x channel (a2+b) e (n+) Transmitter Receiver Modulation Synchronous Demodulation 1. Suppose the modulator and demodulator are not synchronized in phase. 2. Suppose the modulator and demodulator are not synchronized in frequency. 55 Chapter 8 Communication Systems 1. Suppose the modulator and demodulator are not synchronized in phase. ① Complex Exponential Carrier §8.2.1 Synchronous Demodulation j t ( c c ) e  + x(t) y(t) Communication Channel Transmitter Modulation Receiver Synchronous Demodulation LPF x(t) w(t) j t ( d ) e − +   2. Suppose the modulator and demodulator are not synchronized in frequency