Find Eb/No : signal to noise ratio

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SUMMARY

The discussion focuses on calculating the energy per bit to noise power spectral density ratio (E_b/N_0) for a digital communication system. Given a received signal level of -151 dBW and an effective noise temperature of 1500K, the solution derived is E_b/N_0 = 12 dBW using the formula (E_b/N_0) = –151 dBW – 10 log 2400 – 10 log 1500 + 228.6 dBW. The thermal noise calculation is also detailed, resulting in N = -163.037 dBW, confirming the derived E_b/N_0 value.

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  • Understanding of digital communication principles
  • Familiarity with signal-to-noise ratio (SNR) calculations
  • Knowledge of thermal noise and its impact on communication systems
  • Proficiency in logarithmic calculations and decibel (dB) conversions
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  • Study the derivation of the Shannon Capacity formula
  • Learn about the impact of effective noise temperature on communication systems
  • Research the relationship between bandwidth and signal power in digital communications
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This discussion is beneficial for electrical engineers, telecommunications professionals, and students studying digital communications, particularly those focused on signal processing and noise analysis.

bos1234
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Homework Statement


If the received signal level for a particular digital system is -151dBw and the receiver system effective noise temperatyre is 1500K, what is E_b/N_o for a link transmitting 2400bps?

solution says:
(Eb/N0) = –151 dBW – 10 log 2400 – 10 log 1500 + 228.6 dBW = 12 dBW

My attempt:
Im trying to use C=Blog_2(1+SNR) and N=kTB
But I have 3 variables and only 2 equations. B's will be canceled but N and SNR(E_b/N_o) are unknown
 
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Thermal noise in Watt= kTb
Thermal noise in dBW(N)=10logk +10logT +10logb
N=-228.6+10log1500+10log2400=-163.037dBW
Eb/N0=S/kTb
(Eb/No)dB=S dBW -N dBW=-151 -(-163.037)
=12.03 dBW
 
Rajeswari Rajasingh said:
Thermal noise in Watt= kTb
Thermal noise in dBW(N)=10logk +10logT +10logb
N=-228.6+10log1500+10log2400=-163.037dBW
Eb/N0=S/kTb
(Eb/No)dB=S dBW -N dBW=-151 -(-163.037)
=12.03 dBW
Welcome to the PF. :smile:

The rules do not allow us to provide solutions to homework problems. We can give hints, ask questions, find mistakes, etc. But the student must do the bulk of the work on their homework assignments. Please keep that in mind in your future posts here.

But since this thread is about 8 years old, and this student likely has their PhD by now, I'll allow your post to remain. :smile:
 
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