[ibis-macro] Re: questions about impulse and clock period in spec
- From: Mike Steinberger <msteinb@xxxxxxxxxx>
- To: fangyi_rao@xxxxxxxxxxx
- Date: Fri, 16 Oct 2009 02:41:49 -0500
1. x[0] = 1/sample_interval x[n] = 0 for all n != 0
Remember that the time integral of a Dirac delta function is 1. The
discrete time approximation (actually shows up in proofs involving delta
functions) is a rectangle with a width equal to sample_interval (in
other words, one discrete sample) and a height of 1/sample_interval (to
get the unit area).
2. You're right that the text could have been clearer. The intent has
always been that the clock period is one UI.
You are also correct that the clock period is not necessarily the
difference between two clock times, in that there may be a missing entry
in the clock times array, or there may be a phase adjustment between two
clock times.
You've asked a good question. Perhaps we should clarify this text in any
future BIRD.
Mike S.
fangyi_rao@xxxxxxxxxxx wrote:
Hi, Experts;
I want to take a break from the flow discussion by asking two questions.
1. If the channel is perfect and its impulse response is a Dirac delta
function, what impulse data should be input to AMI_Init, a pulse (e.g.
rectangle or triangle) with area being 1, or a discrete data with 1 at
t=0 and 0 at other time points?
2. Section 3.2.2.2 states that “It is to be assumed that the input
data signal is sampled at exactly one half clock period after a clock
time”. Does “clock period” mean one UI or the time between two
neighboring clock times returned by GetWave?
I’d appreciate it if anyone can provide me clarification.
Thanks,
Fangyi
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