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Slide4 Pam Pcm(m3)
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Slide PAM PCM
Transcript of Slide4 Pam Pcm(m3)
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PAM-PCM
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*PAM-PCM*
PAM-PCM
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*PAM-PCM*
PAM-PCM
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*PAM-PCM*
PAM-PCM
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*PAM-PCM*
PAM-PCM
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*PAM-PCM*
PAM-PCM
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AdvantagesImmunity to noise : with some amount of noise digital can withstand while analog failed to provide virtually error free transmission. Reduce signal to noise ratio Error control coding ; parity check, Hamming code make more reliable Signal can be completely regenerated at intermediate regenerator for long haul system. More compatible with computer system for signal processing and digital memories for data storage. More elaborate code can be used. Ideal for integrated services digital network (ISDN) *PAM-PCM*
PAM-PCM
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m(t) is sampled, each sample value is rounded off to the nearest allowable value. This value is digitally encoded as a sequence of binary digitsThere are three process of Digitization1. Sampling2. Quantization (devide into level of voltage)The approximation of amplitude value of sinal m(t) into one of M discrete quantized values3. EncodingEach quantization level is encoded into N binary digits*PAM-PCM*Where N is the number of binary digit per code wordM is the number of quantization level
PAM-PCM
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*PAM-PCM*
PAM-PCM
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*PAM-PCM*Uniform distribution
PAM-PCM
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*PAM-PCM*The average powerTime averageContinuous RV
PAM-PCM
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*PAM-PCM*
PAM-PCM
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*PAM-PCM*
PAM-PCM
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*PAM-PCM*
PAM-PCM
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