Venkat,
I assume you are working with a (2,1) trellis code, ie,
1 bit in two bits out.
I also assume that you unpack each input byte to 8 single bits (carried
in a byte)
before trellis encoding and you pack every 4 2-bit worth bytes into a
single byte after trellis encoding.
This means that
Hi Achilleas Anastasopoulos,
Thanks for the reply and clarification on trellis metric
computation.
I tried your idea to connect the ofdm demod block to trellis metric (to
perform both hamming and euclidean distance metrics;as the soft or hard
decision decoding can be performed on
=
*Problem:*
The channel decoding should be performed on the output of ofdm_demod
block(ofdm_frame_sink ; the last block that produces demodulated OFDM
symbols). But, the combined_ viterbi block performs the demodulation of BPSK
or QPSK based on the signal constellation and provides
Hello Everyone,
I'm trying to implement a coded OFDM system by using the trellis blocks.
I used benchmark_ofdm and trellis coded modulation(gr_trellis) provided
in the GNU Radio.
I have achieved the transmission similar to previous post on VIterbi-OFDM
---by Tobias Schmid; but,I couldn't
