[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Discuss-gnuradio] decimation rate of GSM

From: Jane Chen
Subject: [Discuss-gnuradio] decimation rate of GSM
Date: Wed, 4 Feb 2009 18:30:30 -0800 (PST)

Hi all,
I have a question about the decimation rate of GSM (channel is 200kHz wide).
I search the decimation rate of GSM for GNURadio on the Google.  I got some information from http://www.segfault.net/gsm/The_Beginners_Guide_to_analyzing_GSM_data_in_MatLab.pdf
However, I don't understand why they said the sample rate has to be at least 400 kHz (after Nyquist’s theorem).  They used a decimation of 128.
I think through the Nyquist’s theorem, the sample rate should be 200kHz (fs>2fmax, and fmax should be 100kHz). I think the decimation factor is 256.
I am confused. Could anyone please help me?
Thank you,

reply via email to

[Prev in Thread] Current Thread [Next in Thread]