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Demonstrating CDMA, Frequency Hopping, and Other Wireless Techniques with PSPICE Andrew Rusek, Barbara Oakley Department of Electrical and Systems Engineering Oakland University, Rochester, Michigan 48309

Abstract

Wireless communication systems apply various methods of modulation and demodulation. In the literature, these methods are often described very generally in analytical fashion and then illustrated by means of software. However, in the past, neither theory nor simulation have often bridged the gap to show students how general communication functions can be practically implemented in circuitry. This paper discusses PSpice models illustrating how digital modulation and demodulation can be achieved and applied in support of conventional and spread spectrum communication systems. The PSpice models of PSK and FSK systems described in the article can be directly referred to existing hardware. The most popular spread spectrum methods, CDMA and frequency hopping, have been considered and introduced to demonstrate encoding and decoding processes. The PSpice circuits and simulations discussed here would make excellent additions to the classroom or laboratory of any undergraduate communications system course.

I. Introduction

PSpice is the most venerable of the many circuit simulation packages in common use today, and for good reason–it has a free demo version capable of handling fairly complex circuitry, it provides good connection with circuit level software, and it offers a fast learning curve. Even so, there are many competitors: Matlab/Simulab, ViSsim, and Elanix among them. None of these offer substantive demonstration models, and an additional problem is that one must often know more about the inner workings of the simulation than about the processes being investigated. PSpice offers flexibility in Fourier analysis through automatic scaling, along with the possibility of easy customization. As a consequence, PSpice provides unbeatable advantages in modeling communication-related circuitry and systems. In this paper we will explore how basic aspects Table 1: PSpice macromodules of digital modulation, interference, and system discussed in this paper integration can be demonstrated to students through PSpice simulation; Table 1 provides a summary of the 1. Sampling topics. Some areas related to source coding, such as 2. Phase shift keying pulse width modulation, analog-to-digital conversion, and delta modulation were discussed in previous 3. Frequency shift keying papers,1,2 along with other topics such as pulse amp- litude modulation, analog correlators, and frequency 4. Frequency hopping synthesizers. Many simulations related to voltage 5. CDMA with interfering signal controlled oscillators and phase locked loops were also provided, and the interested reader is directed to those papers for in-depth discussions of those topics.

Proceedings of the 2002 American Society for Engineering Education Annual Conference & Exposition Copyright © 2002, American Society for Engineering Education

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Rusek, A., & Oakley, B. (2002, June), Demonstrating Cdma, Frequency Hopping, And Other Wireless Techniques With Pspice Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--10914