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Re: [Discuss-gnuradio] bitrate with distance

From: Jeffrey Lambert
Subject: Re: [Discuss-gnuradio] bitrate with distance
Date: Thu, 24 Jun 2010 23:25:02 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20100512 Thunderbird/3.0.5

On 6/24/2010 10:28 PM, Li Mei-Wen wrote:
  I used USRP1+BasicTX, USRP1+TVRX and ./benchmark_rx/tx.py to transmit packets but used different bitrate (35K, 125K, 216K) in FM bands (88Mhz~108Mhz)
Why the 35K can reached distance longer than 125K and 216K.
In my implementation result, the 35K was 20m, 125 was 18m and 216 was 16m.
Why have this result, the modulation was same, just different bitrate.

This is most likely because the higher bit rates require a higher signal-to-noise ratio (SNR) for the transmitted bits to be received effectively.

What you are experiencing can probably be characterized with the Shannon-Hartley theorem.  http://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theorem


~Jeffrey Lambert,  K1VZX

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