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part¢¡chapter 1introduction11historical review of communication12message,information,and signal13digital communication131basic concept132advantages of digital communication133digital communication system model134specifications of digital communication system14channel141wireless channel142wired channel143channel models144influence of channel characteristics on signal transmission15noise in channel16brief summaryquestionsexerciseschapter 2signals21classification of signals22characteristics of deterministic signals221characteristics in frequency domain222characteristis in time domain23characteristics of random signals231probability distribution of random variable232probability density of random variable24examples of frequently used random variables25numerical characteristics of random variable251mathematical expectation252variance253moment26random process261basic concept of random process262stationary random process263ergodicity264autocorrelation function and power spectral density of stationary random process27gaussian process28narrow band random process281basic concept of narrow band random process282characteristics of narrow band random process29sinusoidal wave plus narrow band gaussian process210signal transfer through linear systems2101basic concept of linear systems2102deterministic signal transfer through linear systems2103random signal transfer through linear systems211brief summaryquestionsexerciseschapter 3analog modulation system31introduction32linear modulation321amplitude modulation £¨am£©322doublesideband modulation £¨dsb£©323singlesideband modulation £¨ssb£©324vestigial sideband modulation £¨vsb£©33nonlinear modulation331basic principles332frequency spectrum and bandwidth of modulated signal333reception of angular modulated signal34brief summaryquestionsexerciseschapter 4digitization of analog signal41introduction42sampling of analog signal421sampling of lowpass analog signal422sampling of bandpass analog signal423analog pulse modulation43quantization of sampled signal431principles of quantization432uniform quantization433nonuniform quantization44pulse code modulation441basic principles of pulse code modulation442natural binary code and fold binary code443quantization noise in pcm system45differential pulse code modulation451principles of differential pulse code modulation452quantization noise and signal to quantization noise ratio in dpcm system46delta modulation461principles of delta modulation462quantization noise in delta modulation system47brief summaryquestionsexerciseschapter 5representation and transmission of baseband digital signal51introduction52coding method of character53waveform of baseband digital signal54symbol code types of baseband digital signals for transmission55frequency characteristic of baseband digital signal 551calculation of power spectral density of vc(t)552calculation of power spectral density of uc(t) 553calculation of power spectral density of s(t) 554examples of power spectral density calculation56transmission and intersymbol interference of baseband digital signal561model of baseband digital signal transmission system562intersymbol interference and nyquist criterion563partial response system57eye pattern58timedomain equalizer581introduction582fundamental principle of transversal filter 583realization of transversal filter59brief summaryquestionsexerciseschapter 6elementary digital modulation system61introduction62binary amplitude shift keying (2ask)621basic principle622power spectral density623symbol error probability63binary frequency shift keying (2fsk)631basic principle632power spectral density633minimum frequency space634symbol error probability64binary phase shift keying (2psk)641basic principle642power spectral density643symbol error probability65binary differential phase shift keying (2