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Digital Modulation – ASK, FSK & PSK

Atlanta RFServices, Software & DesignsLink Budget Analysis: DigitalModulation, Part RFServices, Software & of Communication for Choice of Modulation : Types & Transfer into Free in Wireless Modulation Communication : An Rates & Transmission : Amplitude Shift : Basis of : of BandpassBinary Probability of ContentLink Budget Analysis: Digital Modulation , Part 12 Refer to Atlanta RF s presentation titled: Link Budget Getting Started , which can be downloaded from our website: Atlanta RFServices, Software & DesignsTypical Sources of Communication DataLink Budget Analysis: Digital Modulation , Part Data Sources: Produces continuous-time output using a device that converts the real analog signal to electrical and static also: temperature, speed, Data Sources: Produces discrete-time output using a device that processes logical Digital signals (binary, ASCII). files/Keyboards/ sent over the storagedevices(Compact Discs, DVDs, ) RFServices, Software & DesignsMetrics for Choice of Modulation SchemeLink Budget Analysis: Digital Modulation , Part spectral efficiency: b.

A. Minimum Shift Keying: MSK B. Gaussian MSK: GMSK Digital signal with two signal levels Digital signal with four signal levels May-2013 www.AtlantaRF.com 12. Atlanta RF Services, Software & Designs Multi-level Signaling: Digital M ary Modulation Link Budget Analysis: Digital Modulation, Part 1 1. In general, multi-level (M-ary) digital ...

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Digital Modulation – ASK, FSK & PSK

atlantarf.com

process is called “phase modulation”. For digital baseband signals, it is called “Phase Shift Keying”: PSK . 2. Phase-Shift Keying (PSK) is a form of digital modulation that represents digital data solely through discrete variations in the phase of a carrier’s signal. 3.

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via Gaussian minimum shift keying (GMSK). • transmission rate—GSM is a digital system with an over-the-air bit rate of 270 kbps. • access method—GSM utilizes the time division multiple access (TDMA) concept. TDMA is a technique in which several different calls • •

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the ideal minimum Nyquist bandwidth have the same value and are equal to the bit rate divided by the number of bits encoded. 2-3 AMPLITUDE-SHIFT KEYING The simplest digital modulation technique is amplitude-shift keying (ASK), where a binary information signal directly modulates the amplitude of an analog carrier.

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FSK = Frequency Shift Keying HPF = High Pass Filter Hz = Hertz IIC or I2C = Inter-Integrated Circuit INT = Interrupt I/O = Input/Output ISR = Interrupt Service Routine kHz = Kilohertz LED = Light Emitting Diode LPF = Low Pass Filter Max = Maximum MHz = Megahertz Min = Minimum ms = Milliseconds

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Binary Frequency -Shift Keying (BFSK) • Two binary digits represented by two different frequencies near the carrier frequency – where f 1 and f 2 are offset from carrier frequency f c by equal but opposite amounts – B = 2([f 2 – f 1]/2 + f b) • Where f b = input bit rate ( ) s t = Acos(2pf 1 t) Acos(2pf 2 t) binary 1 binary 0 Phase ...

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