You can try out using command window of Matlab, by implementing your desired model, you can create your own GUI by including parameters you want to vary. There is no readymade model available for this task in Matlab. However, you can use different toolboxes like signal processing, communications etc. of Matlab.

Thanks Kumar for your constructive response. Actually I want to use IEEE WLAN for signal processing. So is there any WLAN models available in MATLAB or I have make my own WLAN models?

WLAN is a wideband system. Keep in mind that simple Energy detection wont be an optimal strategy for widebands.

Yes Dear Talha... I am trying to use resolve this threeshold issue in energy detection method. I am proposing new ways for getting optimal threeshold detection.

Talha, do I have to use only WLAN model or I can generate my own Model for energy detection. Beside this, how is the idea to use OPNET?

Yes you can. You implement a simple QAM modem, where the receiver is equipped with energy detection algorithm instead of QAM demodulation. This way you are detecting your QAM modulated signal.

Never experience OPNET but from its name, seems that it works at network level where different nodes transmitting and receiving packets. spectrum sensing technique is done at node level for which you can not use OPNET. Once you are done with spectrum sensing, implement this technique to all the nodes in the network and then use OPNET.

HTH

Perfect.... your answer looks very helpful for me. Thanks Dear

it depends on the type of spectrum sensing you are talking about. but for a local spectrum sensing, i would advise that for a spectrum sending method, u can formulate the maximum likelihood model or the Neyman Pearson criterion model. you can derive a threshold by comparing a given target with another. that should be after using energy detection with a M sample of the energy, which you can eventually sum up in a cooperative spectrum sensing.

Thanks Efe.... Your idea helped me alot... Well I think so Cooperative Spectrum analysis work has been done before in order to get optimum threeshold value... I have read papers on it..... should I use WLAN model IEEE 802.11a/b and then get the M number of samples and then detect them? Dear Efe can I discuss some issues regarding this topic in private chat?

i think one can use DVB-T signal in 2k or 8k mode simulation model that is available in matlab for sensing algorithms

I think 802.22 (WRAN), 802.11 (WLAN) and LTE should be taken into consideration. 802.22 is the 1st standard for CR and has been widely studied, while 802.11 (WLAN) and LTE are also popular for communication (Wifi / 4G). Based on this idea, you should consider TV band, Wifi, LTE as the "Objective Signal".  What's more, OFDMA, QAM, QPSK (main tech in TV, Wifi, LTE) should also be modelled in your simulation. 

Send me your mail id I will send you the matlab script.