## Principles of communication systems |

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### Contents

Spectral Analysis | 1 |

Random Variables and Processes | 56 |

AmplitudeModulation Systems | 113 |

Copyright | |

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amplifier amplitude amplitude-modulated antenna assume average bandlimited bandwidth baseband filter baseband signal binary bit interval bit rate bit stream BPSK calculate carrier frequency channel circuit clock codeword correlation corresponding decoding demodulator encoder envelope detector erfc error probability Figure Fourier frequency deviation frequency modulation frequency range function gaussian given by Eq Hence impulse increases integrator low-pass filter modulating signal multiplexing multiplier node noise power normalized power operation orthogonal output signal packet phase phasor plot power spectral density preemphasis Prob probability density probability of error pulse QPSK quantization quency random variable received signal result sampled signal sampling sequence shown in Fig sideband signal m(t signal power signal-to-noise ratio sinusoidal slot spectral components spectrum spike spread spectrum switching symbol synchronous threshold transmission transmitted Verify Eq voltage waveform zero