Google Answers Logo
View Question
Q: Removing fading effect in OFDM receiver ( No Answer,   1 Comment )
Subject: Removing fading effect in OFDM receiver
Category: Computers > Wireless and Mobile
Asked by: persian_eagle-ga
List Price: $15.00
Posted: 06 Aug 2006 05:38 PDT
Expires: 05 Sep 2006 05:38 PDT
Question ID: 753097
Could you please tell me how I can remove the effect of fading in an
BPSK OFDM receiver?
    My channel is a static flat fading:
    gnoise = (noise_var) * sqrt(1/2) * (randn(1,symbol_size) +
    a = randn(1,symbol_size) + j*randn(1,symbol_size) 
    r = a.*ofdm_symbol + gnoise

    at the receiver I have tried the following techniques to remove the 
    effect of channel:

    y = fft(ofdm_sym)./fft(a)

    and also in another attempt I tried:
    temp = r .* conj(a)
    y = fft(temp)

    unfortunately none of them help me to get an error rate near the
theoretical curve for BPSK OFDM flat fading.
There is no answer at this time.

Subject: Re: Removing fading effect in OFDM receiver
From: sparkysko-ga on 07 Aug 2006 15:19 PDT
You need to add a BFO and run SSB.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  

Google Home - Answers FAQ - Terms of Service - Privacy Policy