OFDM
OFDM
FHSS- Which has been dropped recently DSSS- which is still used by access points to advertise themselves
Differential Phase shift key (DPSK) Quadrature amplitude modulation (QAM)
It is used to delay the modulation
Light transmits information through the use of various mechanisms such as modulation, encoding, and transmission. Modulation involves changing the properties of light waves to represent data, encoding converts the data into a format that can be transmitted through light, and transmission sends the encoded data through optical fibers or other mediums. These processes allow light to carry information over long distances at high speeds, making it a crucial component of modern communication systems.
Frequency modulation have some advantages over amplitude modulation, FM is not sensitive to the amplitude noise, and have high efficient use of transmitted power
It uses GFSK (Gaussian Frequency Shift Keying) modulation technique.
how to use lempel_ziv encoding ?
MODULATION is a media for transferring information it can come in many forms FM ,AM, PULSES, PAM and so forth.
transmit the information
Methods of amplitude modulation can be put in the two categories namely Linear modulation methods and Square law modulation methods. Linear modulation method utilizes the linear region of the current voltage characteristics of the amplifying device that is transistor or electron tube. Square law modulation method utilizes the square law region of some current voltage characteristics of a diode or transistor or electron tube. A large number of linear modulation methods have been devised and have been used to varying degree. These methods are namely linear shunt plate modulation or anode choke modulation, linear series plate modulation, grid bias modulation, cathode modulation, suppressor grid modulation, screen grid modulation, collector modulation. Square law modulation circuits make use of non linear current voltage characteristics of diodes or triodes and are in general suited for use at low voltages. Important square law modulation methods are square law diode modulation and balanced modulator.
if we need simple transmitter and receiver, if we need low bandwidth