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in the case of communication through gsm technology we transmit our voice frequency to somewhere from the origin. normally human voice frequency lays between 300-3400khz. if all the people tends to transmit their voice, the signal wil be distroyed due to interference. also theoretically it need a very long antenna to transmit a low frequency. therefore it is necessary to modulate each and every signal to a high frequency carrier to transmit without any interference and make possible communication
mohamed zawahir +94772260383
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What is square law diode modulator?
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.
Why amplitude modulation is used for video transmission?
IF we use frequency modulation for transmitting video signal this can cause phase shifting .and eyes can percieve this distortion effect easly . and requires more bandwidth to send the signal .Color levels are adjusted by amplitude in TV .So it s more logic to use Amplitude modulation .
How velocity modulation and density modulation related to each other?
due to velocity modulation density modulation occurs in TWT
What is the unit for modulation index?
Modulation index is also called as Modulation depth. The modulation index of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level.
Advantages of hybrid modulation over digital modulation?
presentation of analog digital hybrid modulation
Which modulation technique is used in gsm?
GSM uses GMSK modulation scheme. GPRS also uses GMSK modulation scheme. EDGE and UMTS uses 8-PSK.
How modulation rate is calculated for gsm?
The modulation rate in GSM (Global System for Mobile Communications) is primarily determined by the modulation scheme used, which is Gaussian Minimum Shift Keying (GMSK). In GSM, each symbol represents one bit of data, and the modulation rate is calculated based on the symbol rate, which is typically set at 270.833 ksym/s. Thus, the modulation rate is effectively equal to the symbol rate, as each symbol conveys one bit of information, leading to a maximum data rate of about 1.2 kbps per channel.
What modulation technique used in mobile phones?
Currently the mobiles use GSM(Geo Synchronous Mobiles ) and CDMA(Code Division Multiple Accesss) techniques. GSM inturn uses TDMA(Time Division Multiplexing) or FDMA(Frequency Division Multiplexing) or sometimes both to fit in the required criteria.
Vietnam use gsm or CDMA?
gsm
What is use of time delay in adaptive delta modulation?
It is used to delay the modulation
What are the advantages frequency modulation amplitude modulation?
Frequency modulation have some advantages over amplitude modulation, FM is not sensitive to the amplitude noise, and have high efficient use of transmitted power
What Type of modulation used in edge?
In Edge (Enhanced Data rates for GSM Evolution), the modulation scheme primarily used is 8PSK (8 Phase Shift Keying). This allows for higher data rates compared to the earlier GSM standard, which used GMSK (Gaussian Minimum Shift Keying). With 8PSK, Edge can transmit three bits per symbol, effectively increasing the capacity and efficiency of the network.
What modulation does bluetooth use?
It uses GFSK (Gaussian Frequency Shift Keying) modulation technique.
What are the Uses of modulation techniques in telecommunication?
In GSM generally GMSK which is a derivative of MSK is beeing used because of its spectral efficiency and more noise resistant. Regards Sumeer Mehaboob
What Type of modulation used in GSM?
The modulation used in GSM is Guassian minimum-shift keying (GMSK), a kind of continuous-phase frequency shift keying. In GMSK, the signal to be modulated onto the carrier is first smoothed with a Guassian low-pass filter prior to being fed to a frequency modulator, which greatly reduces the interference to neighboring channels (adjacent channel interference). Added By:Muhammad Kamran Atif Contact: kami_cch@hotmail.com
Why won't my Samsung S3650W read my Boost sim card?
Because Boost does not use a GSM network, they use iDEN. Boost phones use a SIM card that is compatible with GSM phones for overseas roaming. However, iDEN is a very different standard from GSM. Most iDEN phones are not compatible with GSM networks, and GSM phones are not compatible with iDEN networks.
Can you use reliance 2G GSM gprs pack in a reliance 3G GSM gprs?
yes
