Comments on: Rayleigh multipath channel model

By: Bala

Bala — Sat, 27 Feb 2010 08:53:05 +0000

Hi,

I am trying to related the number of Tap of Rayleigh fading with its RMS delay spread.

kmax = ceil (5*tau/Ts);
profile = exp(-(0:kmax)*Ts/tau);
profile = profile/(sum(profile));
channel = sqrt(profile/2).*(randn(size(profile))+j*randn(size(profile)));

I found this code somewhere online and does this help?

For OFDM the symbol duration, TS = 4us and im looking at tau(rms delay spread) = 75ns. In the end, i only get 2 Taps. Is this correct?

By: Geethu

Geethu — Tue, 09 Feb 2010 18:33:34 +0000

I would like to know if there is an option to import results from matlab to open WNS for simulation purpose. If yes how. Thanks in advance

By: Ahmed

Ahmed — Mon, 08 Feb 2010 10:58:09 +0000

Hi Krishna,
Thank you very very much
If the channel became Nakagami-m multipath fading channel,How to present this type of channel.
Thank you again

By: Jun

Jun — Mon, 01 Feb 2010 20:30:45 +0000

Dear Krishna,
when i am doing the simulation of the rayleigh channel.I choose the formula r(t)=sum[ an(t)*x(t-tau(t))].
My question is how can i generate the attenuation an(t)?

Best regards,

By: Ghani

Ghani — Sun, 24 Jan 2010 20:04:33 +0000

Hello krishnan sir

Could you kindly send me some code where there are multiple users and each is assigned a signature waveform(DS-CDMA). I need this is study the BER of such system.

Awaiting ur reply.
Thanks in advance

By: Pon Chitra

Pon Chitra — Sat, 23 Jan 2010 12:20:14 +0000

Krishnan Sir,
can u tell me how to do channel estimation for OFDM System with pilot symbol intoduced . The pilots are introduced in block type. The channel estimation has to be done by LS method.

By: A Mehboob

A Mehboob — Fri, 08 Jan 2010 16:33:06 +0000

Dear Krishna
In your post you said theta(n)=2*pi*fc*Tao(n) is the phase of the nth path; what does it mean? is it the phase delay introduced by nth path? If so then how can we say that? I mean we know the overall delay introduced by all paths is basically the phase response but how can we say it to individual path?

Thanks
Anser