Digital comunication

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Modulation Technique

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Digital communication:

Digital communication Modulation Technique

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DIGITAL COMUNICATION PCM DPCM DM ADM ARRAY MARY ASK PSK FSK MARY MARY MARY ASK PSK FSK PULSE MODULATION COHERENT NONCOHERENT

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PCM--> It transmit Information In the form of code words Transmitter -> RECEVIER-> BPF SAMPLER QUNTIZER ENCODER PARALLEL TO SERIAL PULSE GENERATOR PARALLEL TO SERIAL DECODER INTEGRATOR LPF

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Block diagram of DPCM Differential amplifier Sample and hold circuit Quntizer Encoder Parallel To Serial Accumulator Predictor circuit

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Block diagram of DM Analog I/P Sample and hold circuit + - Digital-to-analog Converter (DAC) dc PAM Sampling pulse Up/Down _ Counter U/D Clock 1= up 0= down Delta PCM

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+ - Sample and hold circuit O/P D/A converter DSP Block diagram of ADM

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Hierarchy of digital modulation technique. The digital modulation technique classified in two category. Coherent technique Noncoherent technique Coherent technique -> In coherent technique we have to use a phase synchronize carrier to be generated at the receiver to recover the information signal. Coherent technique are complex but yield better performance. Non-Coherent technique -> In this technique no phase synchronize carrier is needed at the receiver. It is less complex

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Block diagram of coherent ASK transmitter Block diagram of non coherent ASK transmitter S Integrator Sample and hold circuit + - Sin2∏FCT Bit synchronous Reference voltage Decision box Encoder BPF Regenerator O/P

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BPF Balance modulator Level converter Coherent carrier recover BNRZ Product modulator Carrier generator ῀ PSR O/P Block diagram of PSK transmitter  Block diagram of PSK receiver 

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+ Delay BNRZ Product modulator ῀ O/P Block diagram of DPSK Transmitter

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BPF Delay Integrator Decision box O/P DPSK + NOISE Block diagram of DPSK receiver

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BNRZ MUX ADDER √RS cos ω ct √RS cos ω ct V qpsk Block diagram of QPSK Transmitter

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Block diagram of QPSK Receiver Raise I/P To 4 th power BPF Frequency Divider circuit ÷4 Integrator Integrator Latch

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Block diagram of BFSK Transmitter Product modulator Product modulator ADDER V bfsk PL (t) PH (t) ῀ ῀ √2RS cos ω ct √2RS cos ω ct

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Block diagram of BFSK Receiver Integrator Integrator ADDER Decision box ῀ √2RS cos ω ct ῀ √2RS cos ω ct FSK O/P