Thanks for your reply. I still have one question. I try to plot the peak

detection data to observe the the shape of the peak, which seems like

a plateau(square wave).I have done a simulation before in matlab. If

only

one preamble exist, when the 1st half of the preamble correlate with 2nd

half, the shape of peak should be much sharper(like a triangle), because

the repeated pattern is not enough.

My question is :

If gunradio only use one preamble with 2 repeated pattern, the shape of

the

peak should look like a triangle rather than a plateau, is that right?

2013/4/6 Tom R. [email protected]

On Sun, Apr 07, 2013 at 11:49:14AM +0800, Yingjie C. wrote:

Thanks for your reply. I still have one question. I try to plot the peak

detection data to observe the the shape of the peak, which seems like

a plateau(square wave).I have done a simulation before in matlab. If only

one preamble exist, when the 1st half of the preamble correlate with 2nd

half, the shape of peak should be much sharper(like a triangle), because

the repeated pattern is not enough.

My question is :

If gunradio only use one preamble with 2 repeated pattern, the shape of the

peak should look like a triangle rather than a plateau, is that right?

No, the plateau is correct. Since your correlation window is 2x half of

1 symbol, the cyclic prefix will increase your peak (in AWGN channels to

the length of the cyclic prefix).

MB

–

Karlsruhe Institute of Technology (KIT)

Communications Engineering Lab (CEL)

Dipl.-Ing. Martin B.

Research Associate

Kaiserstraße 12

Building 05.01

76131 Karlsruhe

Phone: +49 721 608-43790

Fax: +49 721 608-46071

www.cel.kit.edu

KIT – University of the State of Baden-Württemberg and

National Laboratory of the Helmholtz Association

Thanks for your reply, Martin. I still have one question. I have done

the

simulation for PN peak normalization process in matlab. I try to plot

the

P(refer to correlation result between 1st half and 2nd half) and R(refer

to

the power of 2nd half symbol) . However, when I plot the P and R in the

same picture using gr_plot_float in gnuradio, the curve seems different

my

simulation result. The R curve seems to be up-side-down against P curve.

Please check the attached file for reference. Thank you again.

2013/4/8 Martin B. (CEL) [email protected]