Generalized Lapped Transform (glt) Based High-speed Transmission for Wireless Mobile Communications

In this paper, we describe a Generalized Lapped Transform (GLT) based high-speed transmission technique for wireless mobile communications over Rayleigh fading channel. In this technique, the high-rate data bits are serial-to-parallel converted into low-rate data streams which are then modulated by the GLT based signature sequences. Numerical results show that the GLT based system gives better results than the Walsh code, PN concatenated sequence based system ~31. signature sequences. In addition, fast algorithms are available for its implementation l[10],[11] since the GLT can be viewed as a generalization of the traditional discrete cosine transform (DCT). The paper is organized as follows. In section II, the proposed GLT based high-speed transmission system is described. Section III describes the structure of the GLT and the design of the signature sequence. Section IV presents the numerical results which illustrate the potential of the proposed signature sequences. Conclusion is given in section V. ll. SYSTEM DESCRIPTION