ADC and PCM Modeling of digital source UESTC-Introduction Prof李晓峰 2
2.Modeling of digital source Various digital messages: W H A T H A T 100-1111-100-1111-100-1111 UESTC-Digital transmission through the AWGN channel Prof李晓峰 3
2.Modeling of digital source WH AT HAT 100-1111-100-1111-100-1111 Various digital messages: What's in common?Sequence of numbers,finite values,random n=xo,x2,X32X A random process UESTC-Digital transmission through the AWGN channel Prof李晓峰 4
2.Modeling of digital source A simple model for the digital information source is the DMS(discrete memoryless source). {xn}=xo,X1,X2,x3,…Xn,… A random process UESTC-Digital transmission through the AWGN channel Prof李晓峰 5
2.Modeling of digital source A simple model for the digital information source is the DMS(discrete memoryless source). {xn}=xo,x,X2,X3,…Xn, A random process A DMS is a discrete-time,discrete-and finite amplitude random process (RP),in which all variables are generated independently and with the identical distribution.This implies that the outputs of a DMS are i.i.d.RVs(random variables)from a finite set. To say the source is memoryless means that the RVs from the source are independent of each other. UESTC-Digital transmission through the AWGN channel Prof李晓峰 6