(@jonmcleod2003)
Is it possible (and reasonable) to insert a 32-bit field in the "middle" of a packet, such that the overall CRC-32 of the packet is zero? I know how to put CRC fields...
I've been working with binary BCH codes (63,39) and (63,45) for several weeks, where an additional even parity bit is added to the data to create a 64-bit codeword,...
Hello,In a full duplex RF transceiver, what are the potential problems of a
receive IF strip at a frequency that's equal to the separation between the transmit...
Neil, this is the Scilab script I hacked up from your script above. Thanks!//
//eyeplot.m 10/29/19 Neil Robertson
// Plot eye diagram of vector x
// fs = samples...
This was very informative. Thanks!Playing around with RC and RRC filters, I have found two things: First, I am not using enough taps for this application, and...
There is just something I don't understand here. I have an raised cosine filter with 31 taps, and a root raised cosine filter with 31 taps. If I send a single...
I think I have a fundamental misunderstanding, because the first rrc filter interpolates while the second does not. Every time I input a symbol impulse followed...
If I send a random series of symbol impulses (+3.0, +1.0, -1.0, -3.0) through a raised cosine filter (alpha = 0.2, 31 taps), the output contains a filtered, delayed...
In this case, it's because the DMR spec "splits" the RC filter between the transmitter and receiver. The transmitter splatter filter is RRC and the receiver noise...
It seems like, as a practical matter, to "split" a RC baseband filter into a transmit RRC filter and receive RRC filter, your system has to work like this:The transmitter...
napierm, kaz,As a basic sanity check, is one raised cosine filter equal to two cascaded root raised cosine filters, assuming alpha and filter length match (the sample...
You are right, and I was deeply confused about how this works. This weekend, I started giving the filter one symbol value followed by 9 zeros, and my various RC...
One real conceptual problem I'm having, is that RC or RRC filters seem to cause intersymbol interference straight out of the chute.When I play around with RRC or...
In this case they'll be scaled and fed by I2S to the direct modulation system on an LMX2571, which is on existing hardware. So we don't need to upsample it further...
Thanks! I've thought about GFSK or other modulations, and completely different ways to do it, and we might go another direction soon. But for right now, for a number...
I'm weak here, but I think what I'm doing is not quite the same as interpolation. I'm building in code a baseband signal, which is a train of symbols, each 10 samples...
I pass fixed point values +3, +1,-1,-3 into the filter, which correspond to dibit values 01, 00, 10, 11 from the data stream. Each symbol includes 10 samples, so...
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