In case of single-carrier we can remove the phenomenon of ISI by the process of equalization means we can remove the problem of frequency selectivity by doing so.
my doubt is that even in the case of multicarrier communication we are converting the frequency selective channel into various frequency flat sub-channels, and we know that data rate remains the same for both single carrier and multicarrier the why we need to go for subdividing of the channel and parallel modulation despite we can solve the problem of frequency selectivity and ISI (Intersymbol interference ) by the process of equalization by opening the eye of the eye diagram through recursive channel model?
please any suggestions from experts are highly welcomed and admirable.
Brij Mohan Kumar
M-Tech Communication Systems
Indian Institute of Technology, Patna
Hello Brij,
This is a nice question and Dr. Vinay already provided an elaborated answer. Let me add some few points as well. The motivation behind going for Multicarrier Modulation is not simply because of the delay spread caused by multipath propagation (which essentially introduces frequency selective fading). While standardizing protocols, there is always a concern to transfer as much complexity as possible from UE to eNodeB. Multicarrier modulation is made simpler by the existence of super fast algorithms like FFT which is beneficial for UE which often cannot afford superior computational resource/power to drive expensive algorithm that is usually required by Single Carrier transmission. To made things even simpler for UE, in downlink we can use subchannel specific power loading which is not possible in in single carrier systems. From base station perspective, these issues are not that big of a deal. I hope this gave you a clear view on top of what Dr. Vinay provided. All the best!
Thank you Vinay sir and Hasan sir for your answers it cleared my doubt👍
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