Research On Key Techniques Of High Efficient Communication Based On VWDK

With the development of wireless communication, the demand for high-speed data service is steadily increasing. Owing to the limitation of development in science and technology and the rapid increase of users, the spectrum resource is exhausted day by day. Exploration and research on modulation with high band efficiency is our first imperative. The theory of Fourier Transform, technique of sinusoidal basis fitting, and modern filter theory are employed to design a VWDK efficient communication system. This paper emulate each module in a MATLAB environment. In addition, a comparison and further discussion of the system characteristics between a VWDK high efficient system and a MSK system are presented.(1) For the purpose of the accelerating the side-lobe decay, increasing frequency bandwidth efficiency, two method,unlike the current approach,are put forward to remove the harmonic spectral lines,namely the Fourier Transform method and technique of sinusoidal basis fitting;The sending terminal of VWDK communication link is designed,then both the vadility of those two method removing the harmonic spectral lines and the feasibility of the sending terminal are demonstrated according to the above research findings.(2) In order to reduce the effect on VWDK signal.from AWGN,the denoising method based on Kalman filter as pre-filter and corresponding signal detection technique are proposed; Additionally,the receiving end of VWDK communication link is designed;Afterwards both the vadility of pre-filtering and the feasibility of the receiving end are proved according to the above research findings.(3) On the base of the harmonic spectral lines removed and per-filtering, VWDK communication system with high efficiency is presented, besides its module is built.A new method to compare system performance 1/Peηis proposed wherein bandwidth efficiency and power utilization are both taken into account.The feasibility of VWDK communication system with high efficiency is demonstrated according to the above research findings.(4) The research of this thesis is summerized. And the advantage and disadvantage of the VWDK high efficient system and some contents worthy of further study are stated.