In the design of communication links we must always keep track of the power needed to...

In the design of communication links we must always keep track of the power needed to represent the signals, the effects of the noise and the bandwidth needed. In a post answer the following :

What do you think should be the comparison of signal power vs. noise power?
What do you think will be the most effective method to increase the distance in a communications link?
What do you think will be the most effective method to increase the channel capacity in a communications link?

the answer two to three paragraphs

Solutions

Expert Solution

a) Most effective method for comparision of signal power to noise power is reffered as SNR. it is basically a ratio of signal power to noise power in the recieved signal and represented in logarithmic domain. So as SNR is represented in logarithmic domain and the measure of it is given in decibels. So whenever the signal is transmitted we always try to maximize our SNR in order to minimize the noise at other end. So in similar manner we can define various methods to comare signal and noise power some of them can be PSNR GSNR etc. Irrespective of the method we always try to maximize our signal power and minimize our noise power.

b) So if the distance of our communication increases there are many factors affected by it. There can be data loss, poor SNR, power loss etc. such factors are affected by it. So one of the effective method is to use cable and connector communication to reduce losses and increase efficiency, using a low loss cables and along with that high range antennas to increase our communication range. In distance communication it is always preffered to use cables instead of wireless as its speed might be slow but we can overcome data loss.

c) The channel capacity formula as given by shanon is C = B log(1 + SNR). where B is bandwidth , SNR is signal to noise power ratio, C is channel capacity acheivable in bits/sec.

As you can see its dependency on 2 parameters i.e. Bandwidth and SNR so either you increase the B or increase the SNR. But the transmission BW are extremely limited. so only practical way to increase capacity is to increase SNR as large as possible.

Thank You!!

Manojponduru answered 1 year ago

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