Hi,
I have a MSc degree on telecommunication engineering and I am an expert on the network simulation tools. For last 3 years, I work for a well known telecom company on MAC layer design improvements of Wi-Fi and implement them on several tools like MATLAB and NS-3. You can take a short look to my publishments from google scholar:
1-Adaptation of Carrier Sensing Threshold to Increase Throughput in Dense 802.11ac Wireless Networks
2-Unsticking the Wi-Fi Client: Smarter Decisions Using a Software Defined Wireless Solution
Beside this, since that the difficulty of the work generally depends on the complexity and clearness of research papers, it would be more efficient to share the paper. Improving issue is also an open issue, how and which level do you really need? In other words, the improvement level will depend on the submission place of this work such as project, homework, another research paper ...
Also the price of the work can vary according to difficulty of the work as I mentioned above.
We can discuss the details when you contact with me.
BR,
OMER