Spread spectrum modulation

Definition:

"Spread spectrum modulation is a technique in which a communication signal is transmitted on a bandwidth considerably larger than the frequency content of the original information. Frequency hopping is a basic modulation technique used in spread spectrum signal transmission".

Spread spectrum modulation

S S Mdulation Techniques

Applications of spread spectrum modulation

Applications of DS-SS system

• Applications of DS-SS system

Applications of DS-SS system

FH-MFSK receiver:

FH-MFSK receiver

Frequency hop spread M-ary FSK transmitter

DSSS Coherent Binary Phase-Shift Keying Receiver

Frequency hop spread M-ary FSK transmitter

Magnified waveform for the period of 1st cycle

PSEUDO-NOISE (P-N) sequences

Spread spectrum signal m(t)=b(t).c(t)

maximum length sequence generator

- model of spread spectrum digital communication system

waveform of DS-SS transmitter

DSSS Coherent Binary Phase-Shift Keying Transmitter

Basics of Multiplexing

Difference between Multiplexing and Multiple Access

Comparison in FDM and synchronus TDM and statistical TDM

How Multiplexing of signals in Fiber Optical cable is done?

Multiplexing and Multiple Access

Multiplexing And Multiple Access : Digital Communications Difference between Multiplexing and Multiple Access: Sr.No. Multiplexing Multiple Access 1 “In telecommunications and computer networks, multiplexing is a process where multiple analog message signals or digital data streams are combined into one signal over a shared medium.” “In telecommunications and computer networks, a channel access method or multiple access method allows several terminals connected to the same multipoint physical medium to transmit over it and to share its capacity.” 2 The multiplexed signal is transmitted over a communication channel, which may be a physical transmission medium. A channel-access scheme is based on a multiplex method that allows several data streams or signals to share the same communication channel or physical media.

Difference in between Time division multiplexing (TDM) and Frequency division multiplexing (FDM)

Difference in between TDM and FDM: This page on FDM versus TDM describes difference between FDM and TDM multiplexing . FDM is the short form of frequency division multiplexing and TDM is the short form of time division multiplexing. In FDM each signal is modulated onto different unique RF carrier frequency and all carrier frequencies are separated significantly so that bandwidth of the signals do not overlap in frequency domain. Figure: Difference in between TDM and FDM

Comparison between armature controlled and field controlled DC servo motor

Comparison between armature controlled and field controlled DC servo motor : Field controlled DC servomotor Armature controlled DC servomotor 1. Field is excited by control voltage Armature is excited by control voltage 2. Armature current kept constant Field current kept constant 3. Required low power amplifiers are simple to design Required high power amplifiers 4. Efficiency is poor Efficiency is better 5. It has large time constant It has small time constant 6. Cost is low Cost is high 7. It is open loop system It is close loop system Comparison between ar

M&MA

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