Hi i need answers of these questions. which is related to wireless communication

Question

Hi i need answers of these questions. which is related to wireless communication in BIT

Re-write the equation for a sinusoidal wave with half the amplitude and twice the frequency of s(t )

Why is ‘signal to noise ratio’ (SNR) an important parameter of a signal transmission?

What is the capacity of channel if its bandwidth is 1 MHz and SNR is 50?

i. Spectrum of a channel between 5 MHz and 7 MHz and SNRdB is 30. What is the capacity of this channel?

ii. How many signaling levels are required to transmit data at this capacity?

Explain the difference between Time Division Multiplexing and Frequency Division Multiplexing

Explanation / Answer

Can help you with this any more info needed please comment

TDM VS FDM
In TDM Total available time is divided into several user
In TDM Transmission of two or more signals on the same path, but at different times
In TDM imply partitioning the bandwidth ofthe channel connecting two nodes into finite set of time slots

In FDM total frequency bands are divided into several users
In FDM multiplex system for transmitting two or more signals over a common path by using a different frequency band for each signal.
In FDM The signals multiplexed come from different sources/transmitters.

More information:

Time-Division Multiplexing

>Time-Division Multiplexing (TDM) is a type of digital or analog multiplexing in which two or more signals or bit streams are transferred apparently simultaneously as sub-channels in one communication channel, but are physically taking turns on the channel. The time domain is divided into several recurrent timeslots of fixed length, one for each sub-channel.
>TDM provides greater flexibility and efficiency, by dynamically allocating more time periods to the signals that need more of the bandwidth, while reducing the time periods to those signals that do not need it. FDM lacks this type of flexibility, as it cannot dynamically change the width of the allocated frequency.

Frequency-Division Multiplexing
>Frequency-division multiplexing (FDM) is a form of signal multiplexing where multiple baseband signals are modulated on different frequency carrier waves and added together to create a composite signal
>In many communication systems, a single, large frequency band is assigned to the system and is shared among a group of users
>FDM is used in 1st generation analog system whereas TDM is used in 2nd generation analog system.

1)
The signal to noise ratio, or SNR as it is often termed is a measure of the sensitivity performance of a receiver. This is of prime importance in all applications from simple broadcast receivers to those used in cellular or wireless communications as well as in fixed or mobile radio communications, two way radio communications systems, satellite radio

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