Outline
2012.5
Chapter 0
● Basic elements of communication systems (p.2)
● Primary communication resources (p.3)
● The mobile radio channel (p.18)
● Block diagram of digital communication system (p.22)
● Shannon’s information capacity theorem (p.23-24)
Chapter 1
● Definition and basic concepts of random process
● Stationary and non-stationary
两颗树
● Mean, correlation, and covariance functions, the mean-square value and variance
● The concept of ergodic process
最美的时光歌曲● Transmission of a random process through a linear time-invariant filter
无领导面试
⏹
⏹ The mean, autocorrelation function, and mean-square value of Y
● Power spectral density
⏹ Definition (Equ. 1.38)
⏹ Input-output relation (Equ. 1.39)
⏹ Einstein-Wiener-Khintchine relations (Equ. 1.42, 1.43)
⏹ Properties
● Gaussian process (Equ. 80)
● Concept of white noi
● Reprentation of narrowband noi
⏹ The canonical form (Equ. 1.100)
⏹ Properties of the in-pha and quadrature components (p. 65-66)
⏹ Reprentation using envelop and pha components (Equ. 1.105-1.107)
⏹ Basic concepts of Rayleigh distribution and Rician distribution
● Uncorrelated and statistically independent (p.58)
⏹ Uncorrelated: Covariance is 0
⏹ Statistically independent: defined by joint probability density function
Chapter 2
● Concepts of amplitude modulation and angle modulation (FM and PM)
● AM
⏹ AM signal (Equ. 2.2 and Fig. 2.3), and the amplitude nsitivity ka
⏹ Conditions of correct detection (p. 90)
百合英文⏹ Spectrum of AM wave (Equ. 2.5 and Fig. 2.4)
⏹ Transmission bandwidth BT = 2W
⏹ Virtues and limitations of AM
● Linear modulation schemes
⏹ The general form (Equ. 2.7)
⏹ DSB
◆ DSB signal (Equ. 2.8 and Fig. 2.5)
◆ Spectrum of DSB wave (Equ. 2.9 and Fig. 2.6)
◆ Coherent receiver
◆ Basic knowledge of costas receiver
◆ Basic concept of quadrature-carrier multiplexing
⏹ Basic concepts of SSB and VSB
● Concepts of mixer (Fig. 2.16)
● Concepts of FDM
● Definitions of angle modulation
● FM
⏹ A nonlinear modulation process
⏹ Single-tone FM modulation
◆ Definitions of f,
◆ Basic knowledge of narrowband and wideband FM
⏹ Transmission bandwidth
◆ Carson’s rule (Equ. 2.55)
◆ Know the universal curve
⏹ Demodulation
◆ Frequency demodulation (a direct method) (Fig. 2.30)
◆ Know pha-locked loop (an indirect method)
● Definitions of SNR’s
⏹ (SNR)I, (SNR)O, and (SNR)C
⏹ Figure of merit (Equ. 2.81)
● Comparison of figure of merits between DSB-SC (Equ. 2.88) and AM (Equ. 2.95)
● Basic concepts of threshold effect of AM (p.138) and FM systems (p.149)
Chapter 3
● Sampling
⏹ Definitions of the sampling period and sampling rate
⏹ Instantaneous sampling and the ideal sampled signal (Equ. 3.1-3.3, Fig. 3.2)
⏹ Derivation of the interpolation formula (Equ. 3.4-3.9)
⏹ The sampling theorem and definitions of Nyquist rate and Nyquist interval
⏹ The methods of combat aliasing effect (p.187)
● PAM
⏹ The difference between PAM and natural sampling
⏹ The concept of “sample and hold”
⏹ The PAM signal (Equ. 3.10-3.19)
⏹ The aperture effect
浪费时间的英语● Know PPM and PDM
● Quantization
⏹ Quantization noi and (SNR)O of a uniform quantizer (Equ. 3.25-3.33)
● PCM
⏹ Basic concepts
◆ Discrete in both time and amplitude
◆ Sampling, quantizing, and encoding
⏹ Non-uniform quantizers
◆ -law and A-law
◆ Piecewi linear approximation to the companding circuit
⏹ Five types of line codes and their waveforms
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⏹ Differential encoding
⏹ Noi in PCM systems
◆ Know that noi including channel noi and quantization noi, and that performance is esntially limited by the quantization noi
● Concepts of TDM (Fig. 3.19)
室内装饰设计师
● Know the basic concept of digital hierarchy (p.214) and that the basic rate is 64 kbps
● Concepts of DM and delta-sigma modulation
● Concepts of linear prediction and linear adaptive prediction
● DPCM and its processing gain (Equ. 3.82)
Chapter 4
● Two sources of bit errors: ISI and noi
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● Matched filter
⏹ Frequency respon (Equ. 4.14) and impul respon (Equ. 4.16)
⏹ Properties: the peak SNR dependents only on signal energy-to-noi psd ratio at the filter input
● Error rate due to noi
⏹ Derivation of Equ. 4.35
⏹ The complementary error function (Equ. 4.29)
⏹ The result with equiprobable input signals (Equ. 4.38-4.40)
● The baband data transmission system model (Fig. 4.7 and Equ. 4.44-4.48)
● Nyquist’s criterion
⏹ The Nyquist’s criterion (p.262)
⏹ The ideal Nyquist channel (Equ. 4.54-4.56 and Fig. 4.8, 4.9)
⏹ Raid cosine spectrum (Equ. 4.59, Fig. 4.10)
