Solved assignment problems in communicaion |online Request
Q1. Consider that a 100-kbps data stream is to be transmitted on a voice-grade telephone circuit (with a bandwidth of
Read moreDigital Communications
Communication is the process of exchanging information. The basic components of a digital communication system are: Source, transmitter, channel, receiver and destination (user of information).
Various topics that are covered in this category are:
- Digital communication basics
- PCM (Pulse Code Modulation)
- DPCM (Differential PCM)
- DM (Delta Modulation)
- SS (Spread Spectrum)
- OFDM (Orthogonal Frequency Division Multiplexing)
- MIMO (Multi Input Multi Output) communications
Multi level Digital Modulation
Multi-level digital modulation schemes are used to increase bit rate in data communications. Ordinary modulation techniques such as ASK, FSK
Read morePhase Shift Keying | PSK
Computer data is binary in nature and consists of sequence of 1s and 0s. Telephone lines are analog in nature
Read moreFrequency Shift Keying | FSK
FSK (Frequency Shift Keying) Computer data is binary in nature and consists of sequence of 1s and 0s. Telephone lines
Read moreAmplitude Shift Keying | ASK
ASK (Amplitude Shift Keying) ASK is also known as 2-level ASK, because number of amplitude changes = 2. Other names
Read moreMODEM in digital communications
MODEM MODEM is cobination of modulator and demodulator. Computer data is binary in nature and consists of sequence of 1s
Read moreDelta Modulation in communicaion
Delta Modulation Delta Modulation (DM) is another method to convert analog signal into digital and uses single bit to achieve
Read moreDPCM | Differential PCM
DPCM (Differential PCM) DPCM is designed specifically to take advantage of the sample-to-sample redundancies in typical speech waveforms. Note that
Read moreMultiplexing in communication
Multiplexing Multiplexing is a technique, which allows many users to share a single communication channel (wire, cable, radio link, fiber
Read moreSampling in PCM | Digital Communications
Sampling Sampling is the 2nd process in PCM, which is done after band-limiting the message signal. The process by which
Read moreQuantization in PCM with example
QUANTIZATION The PCM signal is generated by carrying out following basic operations: Band limiting (using LPF) Sampling Quantizing Encoding Two
Read moreOFDM | Orthogonal Frequency Division Multiplexing
OFDM = Orthogonal FDM = Orthogonal Frequency Division Multiplexing Modulation is fundamental requirement in any communication system. Multi means two or
Read moreDirect Sequence Spread Spectrum | DSSS
Direct Sequence Spread Spectrum (DSSS) Radio communication suffers from following problems: Interference Jamming Multipath propagation & fading Secure communication INTERFERENCE:
Read moreInformation theory and Coding basics
Information theory Information theory is theoretical part of communication developed by American mathematician Shannon. It deals with mathematical modelling and
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