Multi-Carrier Communication System Based on Wavelet Packet Division Multiplexing
|School||Chongqing University of Technology|
|Course||Signal and Information Processing|
|Keywords||Wavelet packet division multiplexing Multicarrier communications Sub-carrier Porgy Optimal basis Peak-to-average power ratio Orthogonal Frequency Division Multiplexing|
With the maturing of 3G communications technology into the commercial operation, the next generation of the development of the wireless communication system has been put on the agenda. The combination of the multi-carrier communications with advanced modulation technology, with its high spectrum efficiency, good anti-fading is considered to be the core technology in the next generation of wireless communication systems. Wavelet packet division multiplexing technology not only has good resistance to inter-symbol interference, inter-carrier interference ability, and the ability to adapt with better channel compared to OFDM technology has become recently a hot research. However, the peak-to-average power is relatively high, and the selection of sub-carriers Porgy and optimal basis selection method is more complex challenge has been restricting the further development and application of wavelet packet division multiplexing. Address the problem, in-depth and meticulous research. Full text begins with an overview and explains the study situation and development prospects of the multi-carrier modulation and wavelet packet division multiplexing, time-frequency analysis and wavelet packet theory, and as the basis for analysis in a multipath fading channel model, sub The selection contained Porgy impact of anti-interference performance of the system. The frequency dispersion channel sub-carriers Porgy selection principle, proposed alternative to traditional OFDM technology sine base function of wavelet packet transmission, the use of a good self-orthogonal wavelet packet functions as a sub-carrier Porgy and mutually orthogonal , to get a better anti-noise and anti-jamming performance. The experimental results verify the feasibility and effectiveness of this method. Followed by analysis of the constitutive principles of the wavelet packet basis selection method, the performance requirements for multi-carrier communication system, select the ICI and ISI joint power and peak power ratio as the measurement criteria, and the number of sub-carriers as search constraints, proposed a species based on the root node one level down decomposition of binary slip, measurement criteria function to decide the optimal trade-offs in the child nodes based search algorithm, and solve the problem of optimal basis output constraints. Finally, the simulation results show that under Rayleigh fading channel model: the computing speed of the algorithm is superior to the existing two algorithms and using the optimal basic structure of the system than the breakdown structure of the system performance by about 20%. Conclude the full text of the main work, pointed out the limitations and inadequacies of this study, prospects wavelet packet division multiplexing and multicarrier communications technology, future trends.