Implement Wavelet Packet Transform-based Multicarrier Modulation Algorithm On DSP

Wireless mobile communication provides a more efficient way of messagetransmission for moving subscribers, with flexibility in both time and space. However,the complex wireless channels and limited frequency spectrum source put forwardstricter requirement to the wireless transmission. The select and design of wirelessmodulation/demodulation plays an important role in bettering wireless mobilecommunication performances. CDMA, widely employed in the third generationwireless communication system, however, could not meet the increasing needs ofhigh-quality video and multimedia services. The forth generation prefers to usingmulticarrier modulation technique in order to provide the wide-band, high-speed rateservices. As a result, multicarrier modulation technique became a hotspot in theseyears.The purpose of this paper lies on researching a new modulation technique—WPT-MCM (Wavelet Packet Transform-based MultiCarrier Modulation). First of all,based on the wavelet/wavelet packet theory, the performance and the superiority over theOFDM are presented. At the same time, a new modulation approach, which can beimplemented by fast algorithm, is discussed and analyzed. This paper also proves thepossibility of this new method.Then the structural and the functional features of TMS320C6701 are presentedin detail. Based on it, the software approach and the procedure of WPT-MCM areprovided. Meanwhile, some main techniques in the software design are discussed.After that, under the consideration of the tradeoffs between processing speedand system performance, optimized solutions of some parts are provided. At last,algorithm and some channel coding are implemented on TI's TMS320C6701 EVM.The analysis of the experiment results indicates that the softwareimplementation scheme of this system is qualified to accomplish the task ofWPT-MCM. It also proves the WPT-MCM has unique advantage and great potentialand worth of further researching.