Re: [bluetooth] Need some direction for Error Checking in Baseband

[Jamil Khatib <khatib@ieee.org>]

Hi,
check my notes below

Jyoti Wagholikar wrote:

> Hi,
>    I am trying to simulate the baseband of bluetooth
> system. I am quite new in this area. I am trying to
> understand the specifications. Your advice on it will
> definitely help me. My questions are as follows:

I'll try to help you.

>
> 1.In the access code correlator, what should be the
> threshold value( they haven't mentioned anything
> regarding this)?

In fact this threshold can be programmable, if it is too large it will be very difficult (takes long
time) to trigger start of new packet, if it is too small it could trigger on too many packets and give
bad results.
According to the hamming distance of the access code which is 6 the threshold can be set to 6.


>
> 2. In access code correlator, in how much time
> receiver should declare "Starting of packet found"?
> (10 usec or 20 usec window span)?

I think it should be in 20 us because the Rx slot can start within +-10 us, I am not sure about his why
do you think about 10 us?

>
> 3. In the transmit/receive routines the buffer size is
> not mentioned. What will be the maximum buffer size?
> On which factors this buffer size depends?

This depends on your system implementation it could be the maximum packet size.

>
> 4. Baseband does SAR ( Segmentation and Reassembly).
> Does this SAR depend on the above buffer sizes?

Again it depends on your system implementation. May be L2CAP layer describes this more.

>
> I know I am asking so many questions. Your guidance
> will help me in my project.

Do not worry feel free to ask such discussions help me too
btw, which base band simulation tool do you have ? is it free?

Regards,
Jamil Khatib

>
> Thanks,
> Jyoti
>
> =====
> **************************************************************
> Jyoti Wagholikar
> Graduate Student
> State University Of New York at Stony Brook
> ***************************************************************
>
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--
   Jamil Khatib
OpenCores Organization
http://www.opencores.org




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