Hi Rud, I just sent you the Pascal source code for generating and receiving OFDM via wav files. There is also a simple program that will modify a file to simulate multipath by converting it into multiple rays.
I agree with Vojtech that it's not very useful to flip bits for testing as any useful decoder for HF will operate on an analog input with a resolution at least 2 bits greater than the number of bits encoded in the transmitted signal. 73, John KD6OZH ----- Original Message ----- From: Rud Merriam To: digitalradio@yahoogroups.com Sent: Tuesday, November 06, 2007 02:48 UTC Subject: [digitalradio] Testing Digital Codes at Bit Level I would like to test some digital codes at the bit level, rather than the audio level. Does anyone know of a program that will introduce noise by changing bits in a bit stream? Is anyone familiar with any published works on the web that discuss testing at this level? --- I have a feeling that the above questions are not going to be answered so lets try the roll my own approach for AWGN and Fading in the first attempt. Gaussian Noise: is it valid to generate a stream of noise bits where exceeding a threshold amplitude level injects an erroneous bit into the data stream? I am assuming that noise cannot remove a bit but is that a valid assumption? Fading: is it valid to simulate fading by removing some bits in the data stream? Rud Merriam K5RUD ARES AEC Montgomery County, TX http://TheHamNetwork.net
