examples of transmittersamplifiers, modulator, oscillator, power amplifier, antennaexample of channelswire, cable, optical fiber, free spaceexample of receiverantenna, amplifier, demodulator, oscillator, power amplifierdigital source has what communication systemdigitalanalog source has what communication systemdigital or analogwhat type of signal is usually receivedanaloggoals of communication systems includemaximize transmission rate, maximize system utilization, minimize bit error rate, minimize require bandwidth, minimize complexity, and minimize required powerDigital communication system advantagesmore immune to channel noise and distortion, easier to separate noise, has high data rates, high frequency operation, lower power, good error correction, supports many users,information sourceanalog or digital signal converted into digital signaloutput transducersignal is in desired format along or digital at the outputquanitizationtransforming continuous amplitude into discrete amplitudechannel encoderintroduces redundancy so that receiver can overcome effects of noisemodulatorreduces the bandwidth and makes the signal more robust to noise; conversion from analog to digitalbasebandrange of frequencies is measured from 0 to the maximum bandwidth or highest signal frequencycarrierinformation signal modulated by waveform and is usually at a much higher frequency than the modulating basebandbinary amplitude shift keyingswitching the carrier on or off to create digital pulsesbinary frequency shiftingvarrying the frequency of the carrier wave by choosing one of two frequencies that correspond to a squence of digital pulseswireless communicationtransmitting voice and data using electromagnetic waves in open spaceadvantages of wireless communicationmobility and easier to maintaindisadvantages of wireless communicationsecurity, high costs for setting infrastructure, communication range is limited by transmission medium,satellite systemslarge areas, one way transmission, use of global positioning system (GPS)WLANSconnect local computers by breaking data into packetsZigbee Radioslow data, mesh networking, low power consumptionbluetoothshort range, widely supported, PANwireless sensor networksdigital process for signal proccessing like a radio
