Help me modify my motivation letter

Dear Madam/Sir:

I'm writing in response to your advertisement for the PhD position in your university. I'm currently a second-year a MSc student majoring in computer networks(Telematic) at the xx University, and will complete my degree in September this year. I respectfully submit my candidature for the PhD position, for I believe I'm interested in academic research and can have a good performance in the PhD studies duration with my good academic knowledge and skills.

In 200x,I did very well in the national college entrance examination with a top 0.5% ranking in my province, and was admitted to the faculty of xx in xx University, a top-10 university in China with strengths in science and engineering disciplines. Then,due to my good academic performance with a top x% ranking in my department, I was recommended by the faculty to follow the international MSc program in xx university with full scholarship and tuition fee waver. During the MSc program, I have chance to obtain solid networking knowledge, practise related research skills and expand my exposure to recent advances on networking and related field. Especially, to the requirements in your PhD position advertisement, I have obtained a good knowledge in xx theory, xx theory and programming skills through courses in the MSc program.

Currently, I'm doing the thesis "xx" under supervision of Prof.xx and Prof.xxx from x group. The thesis is within the xx project a large international project founded by the European Community.My task is:
- Propose some scheduling schemes for xx
- Understand and modify the source codes of the discrete event simulator "xx" to implsement the scheduling schemes.
- Evaluate performance through processing the simulation result data. The evaluation is not confined to QoS. QoE(quality of experience) metrics, such
as PSNR of the received video on each peer, are also to be considered. So, some basic knowledge and analysis tools of video coding are involved.

I believe that a PhD. study in your research group will be a very good choice and a major step towards my academic pursuits, ambitions. I would be most grateful if I am given the opportunity for the position.