EC DC 2marksmarks, DIGITAL COMMUNICATION Question Bank, DC Short Answers – ECE 5th SEM Anna University. 0. By vish on. 2. DIGITAL COMMUNICATION. State sampling theorem. If a finite –energy signal satellite communication two marks question and answers QUESTION BANK. Subject Code: EC Subject Name: Digital Communication Techniques. Year/Sem: III/IV. UNIT I PULSE MODULATION. PART A (2 Marks).

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What is matched filter? The sensitivity of the system to timing error is determined by the rate of closure of the eye as the sampling time is varied. Code tree is lengthy way of representing coding process. Locally generated carrier is correlated with incoming ASK signal. Jamming margin is the ratio of average power of interference J to average power of data signal P.

The bandwidth of frequency hop spread spectrum is very much large compared to direct sequences. What is difference between block codes and convolutional codes?

The transmission characteristics keep on changing.

Bit error rate for coherent binary FSK is given as. Hence fixed pair of transmit and receive filters will not serve the equalization problem. This interference of the frequency components is called as aliasing effect. This secrecy capability of spread spectrum is used in military as well as in many commercial applications.

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Write the performance of data transmission system using eye pa ttern technique? They have relatively short acquisition com,unication. Adaptive coding is used for speech coding at low bits rates. This operation is equivalent to binary convolution coding. What are the two fold effects of quantizing process? In coherent detection, the local carrier generated at the receiver is phase locked with the carrier at the transmitter.

Convolutional codes are not developed much as compared to block codes. Digita, are the advantages of the Delta modulation? The encoder for RS code operates on multiple bits simultaneously. I Slow frequency hopping II Fast frequency hopping The pseudo noise sequences generated at the receiver and the transmitted must be same and.

EC2301 Digital Communication Question Bank – 16 Mark Questions | 5th Semester ECE Anna University

This means any code vector can be expressed as linear combination of other code vectors. It has best discrimination against multipath signals.

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T Here Y is the received and H. What is the value of maximum signal to noise ratio of the matched filter?

What digutal meant by systematic and non-systematic codes? What is meant by PCM? Mention the need of optimum transmitting and receiving filter in ba s eband data transmission.

The pseudo-noise sequence and marms sequence are applied to a product modulator. What are the error detection and correction capabilities of hamming co d es?

DPCM can have more than one bit of encoding the sample. Hence Ck becomes a correlated signal even though a k is not correlated. This expressed in terms of message bits.

EC Digital Communication – Two Marks and 16 Marks with Answers – All Units

Free distance is the minimum distance between code vectors. When it becomes maximum? This interference of the frequency components is called as aliasing effect.