added RF bandwidth

git-svn-id: https://svn.code.sf.net/p/freetel/code@3458 01035d8c-6547-0410-b346-abe4f91aad63

diff --git a/codec2-dev/README_ofdm.txt b/codec2-dev/README_ofdm.txt
index 1ae335a6417382dc4e3ea236b452c0bc73dad6b8..33176225c60474f0754fc4d736e8f3b3d8ffab0c 100644 (file)
--- a/codec2-dev/README_ofdm.txt
+++ b/codec2-dev/README_ofdm.txt
@@ -94,6 +94,7 @@ Payload bits/s: 700
 Text bits/s...: 25
 Unique Word...: 10 bits
 Carriers......: 17
+RF bandwidth..: 944 Hz
 Symbol period.: 18ms
 Cyclic Prefix.: 2ms (note 1)
 Pilot rate....: 1 in every 8 symbols
@@ -112,5 +113,6 @@ Notes:
   2/ Ideal SNR(3000) = Eb/No + 10*log10(Rb/B)
                      = -1 + 10*log10(1400/3000)
                      = -4.3 dB,
-     So we have about 2dB overhead for synchronisation and implementation loss.
+     So we have about 1.8dB overhead for synchronisation, implementation loss,
+     and the text channel.
   3/ HF Multipath channel used for testing is two path, 1Hz Doppler, 1ms delay