few questions about Wi fi

These questions were Pm'ed by the user abhinaykumar.
Its better they be here, as we might get better understanding form other CEans .

Anyone having a thorough understanding can always correct the below replies.

>Is wifi signal a digital r anlog signal?
--Wi fi operates over digital techonology called Spread spectrum technology along wiht a combination of OFDM. In a spread spectrum technology, we 'spread' the signal across an entire bandwidth of another singal called as a code sginal. Each code duration is comparitively less than the infomration signal bit, thus we spread each information bit over many other bits.
its is similar to dividing your luaggae into smaller quantities and sending them in a number of trucks with other peopl's luggage. Each luggage has its own seq number assigned so at desitnation you pick up only those peicies of luaggage which satisfy the sequence

>I heard a wifi signal cannot be amplified is it true?
The systems are generally low power systems for that matter as SS is about hiding the signal in the noise.
and as well signal which is amplified, will amplify the noise level as well.I am really not sure of this question but I think there migth be a reason if it is so.
Saying that,There are various signal boasters avaliable in market which employee various techinques to enahnce the conenctivity, like using MIMO antennas or selecting strongest signal within the vicinity and all.


>How amplification process gets the signal strength strong and clear as we use in the mobile phones for the sake of voice clarity when we have low signal?
---You must be aware if you consider a sine signal of format A*sin(wt+theta), A is your amplitude right? Power of a signal = A^2.
Hence, when amplitude increases the power of the signal is as well increased.
If you consider a mobile phone, you must be already knowing that the recieved power is dependant on the trasnmitted power, distance and height of your antennas. not always you get good signal, becasue any of the above factors might be contributing in they way they need to be.


>If a wifi signal is amplified, according to the property of a signal we should get strong signal of the wifi if we get the strong signal of wifi we can surf the internet still more faster, is this way works?
--No, a strong signal doesnot really mean you have a better data rate. If you have subscribed for a data rate of say 512kbps, with so called amplification you dont tend to see a better speed, you only will see improvement in which you connectie , if you have a good signal the number of packets dropped are less, hence you will have a better internet experience, but the number of packets/sec what you have subcribed to wont change right? Something like a better road with lesser pot holes allows you to drive fast , but doesnot alter the number of cars which drive.