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HW #8 Textbook: "Wireless Communications," by Andreas F. Molisch, John Wiley & Sons chap 11: Problems 1,2,7 - end of chapter problems

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HW #8
Textbook:
"Wireless Communications," by Andreas F. Molisch, John Wiley & Sons
chap 11: Problems 1,2,7 - end of chapter problems
005_5xux85k-khbou1yh.docx
Answered Same Day Dec 20, 2021

Solution

Robert answered on Dec 20 2021
132 Votes
HW #8
Textbook:
"Wireless Communications," by Andreas F. Molisch, John Wiley & Sons
chap 11: Problems 1,2,7 - end of chapter problems
Answer 1:
A larger bandwidth time product helps in achieving better time domain performance. The spread
of a pulse is over a shorter time if a higher bandwidth time product is used. This , in turn helps to
educe intersymbol interference.(As is evident in the figure below.)
With a BGT =0.3 in GSM we get nearly 99% of the power spectrum within a bandwidth of
250kHz. Also, in GSM the spectrum is divided into 200 kHz channels for multiple access resulting
in very less interference between the channels. A higher value of BGT will only reduce the spectral
efficiency as the power spectrum roll-off is lower. The value is not lowered beyond this as after
this inter-channel interference will become...
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