Peak detection

GNU Radio
1

Dear all,

I finally figure out how to receive packet using OFDM and Alamouti but
unfortunately looks like I cannot detect all the peaks.
10% of the packets that I receive are right.
I think that I experience a phase rotation, i.e. instead of receiving
-1, I receive +1 for some preamble symbols and hence the channel
estimate matrix has negative components.
I am using PN to detect peaks.

Do you have any advise or suggestion on how to fix this?
I though to put a delay using a sleep in the alamouti encoder between
2 consecutive OFDM symbols in order to avoid the overlapping of
symbols but it doesn’t work.

Looking forward to hearing from you

Vanessa

–
Vanessa GARDELLIN, Ph.D.
Researcher
Institute for Informatics and Telematics (IIT),
Italian National Research Council (CNR)
Via G. Moruzzi 1
56124 Pisa - ITALY
Phone: +390503153267
Room: B65/c
E-mail: [email protected]
WWW: http://www.iit.cnr.it/staff/vanessa.gardellin/
Skype: gardellin.vanessa

2

Dear all,

I finally figure out how to receive packet using OFDM and Alamouti but
unfortunately looks like I cannot detect all the peaks.
10% of the packets that I receive are right.
I think that I experience a phase rotation, i.e. instead of receiving
-1, I receive +1 for some preamble symbols and hence the channel
estimate matrix has negative components.
I am using PN to detect peaks.

Do you have any advise or suggestion on how to fix this?
I though to put a delay using a sleep in the alamouti encoder between
2 consecutive OFDM symbols in order to avoid the overlapping of
symbols but it doesn’t work.

Looking forward to hearing from you

Vanessa

–
Vanessa GARDELLIN, Ph.D.
Researcher
Institute for Informatics and Telematics (IIT),
Italian National Research Council (CNR)
Via G. Moruzzi 1
56124 Pisa - ITALY
Phone: +390503153267
Room: B65/c
E-mail: [email protected]
WWW: http://www.iit.cnr.it/staff/vanessa.gardellin/
Skype: gardellin.vanessa

–
Vanessa GARDELLIN, Ph.D.
Researcher
Institute for Informatics and Telematics (IIT),
Italian National Research Council (CNR)
Via G. Moruzzi 1
56124 Pisa - ITALY
Phone: +390503153267
Room: B65/c
E-mail: [email protected]
WWW: http://www.iit.cnr.it/staff/vanessa.gardellin/
Skype: gardellin.vanessa