FPGA Central

Dear all,

I am writing my thesis with subject:" Study and comprarison of FDD & TD
duplexing methods in 4G wireless networks" and i am facing a real deal o
how i can simulate and compare those two methods by scripting a matla
program.

But, and this is the difficult coding part, i want to perform SIR i
cross-slot interference analysis between BSs and MSs with a specific pat
loss exponent, different when using TimeSlots grouping or not, in cochanne
and adjacent channels interference, using both, omnidirectional an
sectored antennas for TDD and FDD schemas.

In brief id like to understand how i can simulate in matlab the fdd an
tdd methods in an cellular network (same timeslot, different frequenc
(fdd) same timeslot splitted for upling and downlink(tdd), how?)

I have not understood the exact way to mathematically represent thos
duplexing methods in order to simulate then in matlab.

So any help in this point would be very helpfull.

Kind Regards,
George.

On Mon, 05 Oct 2009 11:08:01 -0500, Kyriazis wrote:

> Dear all,
>
> I am writing my thesis with subject:" Study and comprarison of FDD & TDD
> duplexing methods in 4G wireless networks" and i am facing a real deal
> on how i can simulate and compare those two methods by scripting a
> matlab program.
>
> But, and this is the difficult coding part, i want to perform SIR in
> cross-slot interference analysis between BSs and MSs with a specific
> path loss exponent, different when using TimeSlots grouping or not, in
> cochannel and adjacent channels interference, using both,
> omnidirectional and sectored antennas for TDD and FDD schemas.
>
> In brief id like to understand how i can simulate in matlab the fdd and
> tdd methods in an cellular network (same timeslot, different frequency
> (fdd) same timeslot splitted for upling and downlink(tdd), how?)
>
> I have not understood the exact way to mathematically represent those
> duplexing methods in order to simulate then in matlab.
>
> So any help in this point would be very helpfull.
>
Kindly expand your acronyms. Thanks.

--
www.wescottdesign.com

Kyriazis wrote:

> Dear all,
>
> I am writing my thesis with subject:" Study and comprarison of FDD & TDD
> duplexing methods in 4G wireless networks"

I touched something similar in my thesis, and CDMA was also included.

> and i am facing a real deal on
> how i can simulate and compare those two methods by scripting a matlab
> program.

FDD == TDD == CDMA == OFDM. The methods are equivalent. You can only
compare particular systems, their shortcomings and the complexity of
realization. With any system, you've got to waste some bandwidth for the
guard intervals either in time or in the frequency domain; it can be
shown that the situation is the same regardless of the channel access
method, but depends on the unpredictable variations of the channel only.

> But, and this is the difficult coding part, i want to perform SIR in
> cross-slot interference analysis between BSs and MSs with a specific path
> loss exponent, different when using TimeSlots grouping or not, in cochannel
> and adjacent channels interference, using both, omnidirectional and
> sectored antennas for TDD and FDD schemas.

What point are you trying to make by your simulation?

> In brief id like to understand how i can simulate in matlab the fdd and
> tdd methods in an cellular network (same timeslot, different frequency
> (fdd) same timeslot splitted for upling and downlink(tdd), how?)
> I have not understood the exact way to mathematically represent those
> duplexing methods in order to simulate then in matlab.
> So any help in this point would be very helpfull.

Sure. Regular consulting rate applies.


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

"..
.."

>Kindly expand your acronyms. Thanks.
>
>--
>www.wescottdesign.com

FDD: Frequency Division Duplexing
TDD:Time Division Duplexing
BSs: Base Stations
MSs: Mobile Stations


"..
>
>FDD == TDD == CDMA == OFDM. The methods are equivalent. You can only
>compare particular systems, their shortcomings and the complexity of
>realization. With any system, you've got to waste some bandwidth for th

>guard intervals either in time or in the frequency domain; it can be
>shown that the situation is the same regardless of the channel access
>method, but depends on the unpredictable variations of the channel only.
>
>What point are you trying to make by your simulation?
>
..
>

> So any help in this point would be very helpfull.

Sorry,i meant: would be much appreciated.

>
..
>
Sure. Regular consulting rate applies.

>
>
>Vladimir Vassilevsky
>DSP and Mixed Signal Design Consultant
>http://www.abvolt.com
>
.."

Firstly thank you all for your time and your help.

My exact point is to perfom and simulate Signal Interference Ratio i
cross-slot interference analysis.

Can you please advice to specify the correct way to build the requeste
simulation methology?